Patent application number | Description | Published |
20080269591 | BAND STOP FILTER EMPLOYING A CAPACITOR AND AN INDUCTOR TANK CIRCUIT TO ENHANCE MRI COMPATIBILITY OF ACTIVE MEDICAL DEVICES - A band stop filter is provided for a lead wire of an active medical device (AMD). The band stop filter includes a capacitor in parallel with an inductor. The parallel capacitor and inductor are placed in series with the lead wire of the AMD, wherein values of capacitance and inductance are selected such that the band stop filter is resonant at a selected frequency. The Q of the inductor may be relatively maximized and the Q of the capacitor may be relatively minimized to reduce the overall Q of the band stop filter to attenuate current flow through the lead wire along a range of selected frequencies. In a preferred form, the band stop filter is integrated into a TIP and/or RING electrode for an active implantable medical device. | 10-30-2008 |
20080294220 | FEEDTHROUGH FILTER TERMINAL ASSEMBLIES WITH BREATHABLE COMPONENTS TO FACILITATE LEAK TESTING - A feedthrough terminal assembly for an active implantable medical device (AIMD) includes a conductive terminal pin or lead wire which extends through a conductive ground plane of the AIMD in non-conductive relation. A feedthrough capacitor associated with the terminal pin or lead wire has first and second sets of electrode plates coupled, respectively, to the conductive pin or lead wire and to the ground plane. A breathable electromechanical connection material conductively couples the capacitor's electrode plates to respective components of the AIMD, which allows helium gas to pass freely therethrough during a standard pressurized or vacuum pull helium leak detection test. A breathable washer may be disposed between an alumina insulator and a surface of the capacitor. An additional further breathable coating or conformal coating may be placed over a surface of the feedthrough capacitor disposed toward the interior of the AIMD. | 11-27-2008 |
20090116167 | PASSIVE ELECTRONIC NETWORK COMPONENTS DESIGNED FOR DIRECT BODY FLUID EXPOSURE - An EMI filter capacitor assembly and implantable passive electronic network components utilize biocompatible and non-migratable materials to adapt the electronic components for direct body fluid exposure. The assembly includes a capacitor having first and second sets of electrode plates which are constructed of non-migratable biocompatible material. A conductive hermetic terminal of non-migratable and biocompatible material adjacent to the capacitor is conductively coupled to the second set of electrode plates. One or more conductive terminal pins having at least an outer surface of non-migratable and biocompatible material are conductively coupled to the first set of electrode plates, while extending through the hermetic terminal in non-conductive relation. The terminal pins may be in direct contact with the first set of electrode plates, or in contact with a termination surface of conductive connection material. The termination surface is also constructed of non-migratable and biocompatible materials. | 05-07-2009 |
20090128986 | HYBRID DISCOIDAL/TUBULAR CAPACITOR - A hybrid capacitor includes a body of dielectric material having spaced-apart first and second surfaces. A first electrode is associated with the first surface. A second electrode is associated with the second surface. One or more third electrodes are transversely disposed within the dielectric body between the first and second electrodes. Either the first or second electrode is not conductively coupled to any electrode transversely extending into the body. The resulting arrangement provides a hybrid capacitor having characteristics of both a tubular capacitor and a discoidal capacitor. | 05-21-2009 |
20090243756 | SHIELDED THREE-TERMINAL FLAT-THROUGH EMI/ENERGY DISSIPATING FILTER - A shielded three-terminal flat-through EMI/energy dissipating filter includes an active electrode plate through which a circuit current passes between a first terminal and a second terminal, a first shield plate on a first side of the active electrode plate, and a second shield plate on a second side of the active electrode plate opposite the first shield plate. The first and second shield plates are conductively coupled to a grounded third terminal. In preferred embodiments, the active electrode plate and the shield plates are at least partially disposed with a hybrid flat-through substrate that may include a flex cable section, a rigid cable section, or both. | 10-01-2009 |
20090259265 | ELECTRONIC NETWORK COMPONENTS UTILIZING BIOCOMPATIBLE CONDUCTIVE ADHESIVES FOR DIRECT BODY FLUID EXPOSURE - An implantable passive or active electronic network component or component network is provided which is suitable for prolonged direct body fluid exposure and is attachable to a conductive surface, circuit trace, lead or electrode. The electronic network component or component network includes (1) a non-conductive body of biocompatible and non-migratable material, (2) a conductive termination surface of biocompatible and non-migratable material, associated with the body, and (3) a connection material of biocompatible and non-migratable material, for conductively coupling the termination surface to the conductive surface, circuit trace, lead or electrode. The electronic network component may include a capacitor, a resistor, an inductor, a diode, a transistor, an electronic switch, a MEMs device, or a microchip. A biocompatible and non-migratable adhesive is utilized to conductively couple components of the individual components of the electronic network, such as the conductive surface, circuit trace, lead or electrode. | 10-15-2009 |
20090288280 | PROCESS FOR MANUFACTURING EMI FILTERS UTILIZING COUNTER-BORED CAPACITORS TO FACILITATE SOLDER RE-FLOW - An EMI filtered terminal assembly includes at least one conductive terminal pin, a feedthrough capacitor, and a counter-bore associated with a passageway through the capacitor and the lead wire. Preferably, the feedthrough capacitor having counter-drilled holes on its top side is first bonded to a hermetic insulator. The counter-bore in the capacitor provides greater volume for the electro-mechanical attachment between the capacitor and the lead wire, permitting robotic dispensing of, for example, thermal-setting conductive adhesive. | 11-26-2009 |
20090312835 | DIELECTRIC FLUID FILLED ACTIVE IMPLANTABLE MEDICAL DEVICES - Active implantable medical devices (AIMDs) are backfilled with a dielectric fluid to increase the volts per mil dielectric breakdown strength between internal circuit elements. In a method for backfilling the AIMD with dielectric fluid, substantially all air and moisture is evacuated from the AIMD housing prior to backfilling the AIMD housing with a dielectric fluid having a dielectric breakdown strength greater than air, nitrogen or helium. The AIMD is constructed to accommodate volumetric expansion or contraction of the dielectric fluid due to changes of pressure or temperature of the dielectric fluid to maintain integrity of the AIMD. | 12-17-2009 |
20100016936 | FREQUENCY SELECTIVE PASSIVE COMPONENT NETWORKS FOR IMPLANTABLE LEADS OF ACTIVE IMPLANTABLE MEDICAL DEVICES UTILIZING AN ENERGY DISSIPATING SURFACE - Decoupling circuits are provided which transfer energy induced from an MRI pulsed RF field to an energy dissipating surface. This is accomplished through broadband filtering or by resonant filtering. In a passive component network for an implantable leadwire of an active implantable medical device, a frequency selective energy diversion circuit is provided for diverting high-frequency energy away from a leadwire electrode to a point or an area spaced from the electrode, for dissipation of high-frequency energy. | 01-21-2010 |
20100023000 | FREQUENCY SELECTIVE PASSIVE COMPONENT NETWORKS FOR IMPLANTABLE LEADS OF ACTIVE IMPLANTABLE MEDICAL DEVICES UTILIZING AN ENERGY DISSIPATING SURFACE - Decoupling circuits are provided which transfer energy induced from an MRI pulsed RF field to an energy dissipating surface. This is accomplished through broadband filtering or by resonant filtering. In a passive component network for an implantable leadwire of an active implantable medical device, a frequency selective energy diversion circuit is provided for diverting high-frequency energy away from a leadwire electrode to a point or an area spaced from the electrode, for dissipation of high-frequency energy. | 01-28-2010 |
20100023095 | TRANSIENT VOLTAGE/CURRENT PROTECTION SYSTEM FOR ELECTRONIC CIRCUITS ASSOCIATED WITH IMPLANTED LEADS - A transient voltage/surge current protection system is provided for electronic circuits associated with implanted leads. In particular, a transient voltage suppressor such as a diode, a zener diode, a transorb, a surge protector, varistor components or the like, is placed in parallel with the electronic circuits to thereby divert harmful surge current and bypass the electronic circuit during an external defibrillation event or during an applied therapeutic shock, such as from an ICD. | 01-28-2010 |
20100060431 | MINIATURE HERMETICALLY SEALED RFID MICROELECTRONIC CHIP CONNECTED TO A BIOCOMPATIBLE RFID ANTENNA FOR USE IN CONJUNCTION WITH AN AIMD - A non-hermetically sealed and biocompatible multi-turn RFID loop antenna is electrically connected to a RFID chip which is enclosed within its own hermetically sealed miniature container. The hermetic seal can be very small and the loop antenna can be relatively large, wherein the entire package is both highly reliable, resistant to body fluids and completely biocompatible. The RFID structure can be implanted in a patient and later communicate with an RFID interrogator to provide information relating to the patient and/or implantable medical devices. | 03-11-2010 |
20100100164 | CAPACITOR AND INDUCTOR ELEMENTS PHYSICALLY DISPOSED IN SERIES WHOSE LUMPED PARAMETERS ARE ELECTRICALLY CONNECTED IN PARALLEL TO FORM A BANDSTOP FILTER - One or more inductors and one or more capacitors are physically disposed relative to one another in series and are electrically connected to one another in parallel to form a bandstop filter. Chip inductors and chip capacitors having spaced apart conductive terminals are physically arranged in end-to-end abutting relation to minimize electrical potential between adjacent conductive terminals. The bandstop filter may be hermetically sealed within a biocompatible container for use with an implantable lead or electrode of a medical device. The values of the inductors and the capacitors are selected such that the bandstop filter is resonant at one or more selected frequencies, such as an MRI pulsed frequency. | 04-22-2010 |
20100123547 | RFID DETECTION AND IDENTIFICATION SYSTEM INCLUDING AN RFID READER HAVING A LIMITED TRANSMIT TIME AND A TIME-OUT PERIOD TO PROTECT A MEDICAL DEVICE AGAINST RFID-ASSOCIATED ELECTROMAGNETIC INTERFERENCE - A system is provided for identifying implanted medical devices, leads and systems, as well as objects in close proximity to a patient having an implanted active medical device, using a radio frequency identification (RFID) tag having retrievable information relating to the AIMD, lead system and/or patient. An RFID tag communicator includes a circuit for limiting the total continuous transmit time of an interrogation signal, and a time-out circuit for delaying a second and any subsequent interrogation of the RFID tag. | 05-20-2010 |
20100125312 | SATELLITE THERAPY DELIVERY SYSTEM FOR BRAIN NEUROMODULATION - Deep brain electrodes are remotely sensed and activated by means of a remote active implantable medical device (AIMD). In a preferred form, a pulse generator is implanted in the pectoral region and includes a hermetic seal through which protrudes a conductive leadwire which provides an external antenna for transmission and reception of radio frequency (RF) pulses. One or more deep brain electrode modules are constructed and placed which can transmit and receive RF energy from the pulse generator. An RF telemetry link is established between the implanted pulse generator and the deep brain electrode assemblies. The satellite modules are configured for generating pacing pulses for a variety of disease conditions, including epileptic seizures, Turrets Syndrome, Parkinson's Tremor, and a variety of other neurological or brain disorders. | 05-20-2010 |
20100134951 | ELECTROMAGNETIC INTERFERENCE FILTER AND METHOD FOR ATTACHING A LEAD AND/OR A FERRULE TO CAPACITOR ELECTRODES - A discoidal feedthrough capacitor has its active electrode plates disposed within a dielectric body so that an edge of the active electrode plates is exposed at a surface of a through-hole for a conductive lead. The conductive lead is conductively coupled to the exposed edge of the electrode plates without an intervening conductive termination surface. Similarly, a ground electrode plate set of the feedthrough capacitor may have an edge exposed at the outer periphery of the capacitor for conductively coupling the exposed edge of the ground electrode plate to a conductive ferrule without an intervening conductive termination surface. | 06-03-2010 |
20100160997 | TUNED ENERGY BALANCED SYSTEM FOR MINIMIZING HEATING AND/OR TO PROVIDE EMI PROTECTION OF IMPLANTED LEADS IN A HIGH POWER ELECTROMAGNETIC FIELD ENVIRONMENT - An energy management system facilitates the transfer of high frequency energy coupled into an implanted lead at a selected RF frequency or frequency band, to an energy dissipating surface. This is accomplished by conductively coupling the implanted lead to the energy dissipating surface through an energy diversion circuit including one or more passive electronic network components whose impedance characteristics are at least partially tuned to the implanted lead's impedance characteristics. | 06-24-2010 |
20100168821 | SWITCHED DIVERTER CIRCUITS FOR MINIMIZING HEATING OF AN IMPLANTED LEAD IN A HIGH POWER ELECTROMAGNETIC FIELD ENVIRONMENT - An energy management system that facilitates the transfer of high frequency energy induced on an implanted lead or a leadwire includes an energy dissipating surface associated with the implanted lead or the leadwire, a diversion or diverter circuit associated with the energy dissipating surface, and at least one switch for diverting energy in the implanted lead or the leadwire through the diversion circuit to the energy dissipating surface. In alternate configurations, the switch may be disposed between the implanted lead or the leadwire and the diversion circuit, or disposed so that it electrically opens the implanted lead or the leadwire when diverting energy through the diversion circuit to the energy dissipating surface. The switch may comprise a single or multi-pole double or single throw switch. The diversion circuit may be either a high pass filter or a low pass filter. | 07-01-2010 |
20100174349 | SYSTEM FOR TERMINATING ABANDONED IMPLANTED LEADS TO MINIMIZE HEATING IN HIGH POWER ELECTROMAGNETIC FIELD ENVIRONMENTS - An energy management system facilitates the transfer of high frequency energy coupled into an implanted abandoned lead at a selected RF frequency or frequency band, to an energy dissipating surface. This is accomplished by conductively coupling the implanted abandoned lead to the energy dissipating surface of an abandoned lead cap through an energy diversion circuit including one or more passive electronic network components whose impedance characteristics are at least partially tuned to the implanted abandoned lead's impedance characteristics. | 07-08-2010 |
20100185263 | RF ACTIVATED AIMD TELEMETRY TRANSCEIVER - A telemetry wake-up circuit is electrically disposed between a telemetry transceiver associated with an AIMD, and an RF tag. The RF tag may be remotely interrogated to generate a signal to which the telemetry wake-up circuit is responsive to switch the telemetry transceiver from a sleep mode to an active telemetry mode. In the sleep mode, the telemetry transceiver draws less than 25,000 nanoamperes from the AIMD, and preferably less than 500 nanoamperes. | 07-22-2010 |
20100191236 | SWITCHED DIVERTER CIRCUITS FOR MINIMIZING HEATING OF AN IMPLANTED LEAD AND/OR PROVIDING EMI PROTECTION IN A HIGH POWER ELECTROMAGNETIC FIELD ENVIRONMENT - An energy management system that facilitates the transfer of high frequency energy induced on an implanted lead or a leadwire includes an energy dissipating surface associated with the implanted lead or the leadwire, a diversion or diverter circuit associated with the energy dissipating surface, and at least one non-linear circuit element switch for diverting energy in the implanted lead or the leadwire through the diversion circuit to the energy dissipating surface. In alternate configurations, the switch may be disposed between the implanted lead or the leadwire and the diversion circuit, or disposed so that it electrically opens the implanted lead or the leadwire when diverting energy through the diversion circuit to the energy dissipating surface. The non-linear circuit element switch is typically a PIN diode. The diversion circuit may be either a high pass filter or a low pass filter. | 07-29-2010 |
20100191306 | TRANSIENT VOLTAGE SUPPRESSION CIRCUIT FOR AN IMPLANTED RFID CHIP - A transient voltage suppressing (TVS) circuit includes an implantable RFID chip, an antenna associated with the RFID chip, and a transient voltage suppressor electrically connected in parallel to both the RFID chip and the antenna. The transient voltage suppressor may be formed of an array of diodes, such as back-to-back diodes, at least one Zener diode, or back-to-back or series opposing Zener diodes. In preferred embodiments, the antenna is formed of a biocompatible material suitable for long-term exposure to body tissue and body fluids, and the RFID chip and the transient voltage suppressor are disposed within a hermetically sealed biocompatible container. | 07-29-2010 |
20100194541 | HERMETICALLY SEALED RFID MICROELECTRONIC CHIP CONNECTED TO A BIOCOMPATIBLE RFID ANTENNA - An implantable radio frequency identification (RFID) tag includes a hermetically sealed biocompatible housing for an active implantable medical device (AIMD), an RFID microelectronics chip is disposed within the housing, and a biocompatible antenna extends from the RFID microelectronic chip and exteriorly of the housing. In a preferred form of the invention, the antenna is disposed within a header block of the AIMD, and the RFID chip is disposed within the AIMD housing. | 08-05-2010 |
20100198312 | EMI FILTER EMPLOYING A CAPACITOR AND AN INDUCTOR TANK CIRCUIT HAVING OPTIMUM COMPONENT VALUES - A bandstop filter having optimum component values is provided for a lead of an active implantable medical device (AIMD). The bandstop filter includes a capacitor in parallel with an inductor. The parallel capacitor and inductor are placed in series with the implantable lead of the AIMD, wherein values of capacitance and inductance are selected such that the bandstop filter is resonant at a selected frequency. The Q of the inductor may be relatively maximized and the Q of the capacitor may be relatively minimized to reduce the overall Q of the bandstop filter to attenuate current flow through the implantable lead along a range of selected frequencies. | 08-05-2010 |
20100208397 | SWITCHED SAFETY PROTECTION CIRCUIT FOR AN AIMD SYSTEM DURING EXPOSURE TO HIGH POWER ELECTROMAGNETIC FIELDS - An energy management system that facilitates the transfer of high frequency energy induced on an implanted lead or a leadwire includes an energy dissipating surface associated with the implanted lead or the leadwire, a diversion or diverter circuit associated with the energy dissipating surface, and at least one switch disposed between the diversion circuit and the AIMD electronics for diverting energy in the implanted lead or the leadwire through the diversion circuit to the energy dissipating surface. The switch may comprise a single or multi-pole double or single throw switch. The diversion circuit may be either a high pass filter or a low pass filter. | 08-19-2010 |
20100217262 | FREQUENCY SELECTIVE PASSIVE COMPONENT NETWORKS FOR ACTIVE IMPLANTABLE MEDICAL DEVICES UTILIZING AN ENERGY DISSIPATING SURFACE - Decoupling circuits are provided which transfer energy induced from an MRI pulsed RF field to the housing for an active implantable medical device (AIMD) which serves as an energy dissipating surface. This is accomplished through broadband filtering or by resonant filtering. In a passive component network for an AIMD, a frequency selective energy diversion circuit is provided for diverting high-frequency energy away from an AIMD lead to the AIMD housing for dissipation of said high-frequency energy. | 08-26-2010 |
20100222856 | Band stop filter employing a capacitor and an inductor tank circuit to enhance MRI compatibility of active medical devices - A band stop filter is provided for a lead wire of an active medical device (AMD). The band stop filter includes a capacitor in parallel with an inductor. The parallel capacitor and inductor are placed in series with the lead wire of the AMD, wherein values of capacitance and inductance are selected such that the band stop filter is resonant at a selected frequency. The Q of the inductor may be relatively maximized and the Q of the capacitor may be relatively minimized to reduce the overall Q of the band stop filter to attenuate current flow through the lead wire along a range of selected frequencies. In a preferred form, the band stop filter is integrated into a TIP and/or RING electrode for an active implantable medical device. | 09-02-2010 |
20100222857 | Band stop filter employing a capacitor and an inductor tank circuit to enhance MRI compatibility of active medical devices - A band stop filter is provided for a lead wire of an active medical device (AMD). The band stop filter includes a capacitor in parallel with an inductor. The parallel capacitor and inductor are placed in series with the lead wire of the AMD, wherein values of capacitance and inductance are selected such that the band stop filter is resonant at a selected frequency. The Q of the inductor may be relatively maximized and the Q of the capacitor may be relatively minimized to reduce the overall Q of the band stop filter to attenuate current flow through the lead wire along a range of selected frequencies. In a preferred form, the band stop filter is integrated into a TIP and/or RING electrode for an active implantable medical device. | 09-02-2010 |
20100231327 | CAPACITOR AND INDUCTOR ELEMENTS PHYSICALLY DISPOSED IN SERIES WHOSE LUMPED PARAMETERS ARE ELECTRICALLY CONNECTED IN PARALLEL TO FORM A BANDSTOP FILTER - One or more inductors and one or more capacitors are physically disposed relative to one another in series and are electrically connected to one another in parallel to form a bandstop filter. Chip inductors and chip capacitors having spaced apart conductive terminals are physically arranged in end-to-end abutting relation to minimize electrical potential between adjacent conductive terminals. The bandstop filter may be hermetically sealed within a biocompatible container for use with an implantable lead or electrode of a medical device. The values of the inductors and the capacitors are selected such that the bandstop filter is resonant at one or more selected frequencies, such as an MRI pulsed frequency. | 09-16-2010 |
20100241206 | EMI SHIELDED CONDUIT ASSEMBLY FOR AN ACTIVE IMPLANTABLE MEDICAL DEVICE - An EMI shielded conduit assembly for an active implantable medical device (AIMD) includes an EMI shielded housing for the AIMD, a hermetic feedthrough terminal associated with the AIMD housing, and an electronic circuit board, substrate or network disposed within the AIMD housing remote from the hermetic feedthrough terminal. At least one leadwire extends from the hermetic feedthrough terminal to the remote circuit board, substrate or network. An EMI shield is conductively coupled to the AIMD housing and substantially co-extends about the leadwire in non-conductive relation thereto. | 09-23-2010 |
20100280584 | ACTIVE IMPLANTABLE MEDICAL SYSTEM HAVING EMI SHIELDED LEAD - A lead extending exteriorly from an active implantable medical device (AIMD) is at least partially ensheathed within an electromagnetic interference (EMI) shield. The AIMD has a conductive equipotential surface to which the EMI shield may be conductively coupled. An impeding circuit may be provided for raising the high frequency impedance of the lead. An energy diversion circuit may also be provided for conductively coupling the lead to the EMI shield. | 11-04-2010 |
20100318160 | MULTIPLEXER FOR SELECTION OF AN MRI COMPATIBLE BANDSTOP FILTER PLACED IN SERIES WITH A PARTICULAR THERAPY ELECTRODE OF AN ACTIVE IMPLANTABLE MEDICAL DEVICE - An MRI-compatible electronic medical therapy system includes an active medical device connected to a plurality of electrodes. A multiplexer circuit includes at least one circuit protection device in electrical series with the electrodes and the medical device. The circuit protection device is adapted to permit current flow therethrough during normal medical device related therapy, but substantially prevent current flow therethrough in the presence of an induced electromagnetic field. | 12-16-2010 |
20100321163 | RFID DETECTION AND IDENTIFICATION SYSTEM FOR IMPLANTABLE MEDICAL LEAD SYSTEMS - A system for identifying active implantable medical devices (AIMD) and lead systems implanted in a patient using a radio frequency identification (RFID) tag having retrievable information relating to the AIMD, lead system and/or patient. The RFID tag may store information about the AIMD manufacturer, model number, serial number; leadwire system placement information and manufacturer information; MRI compatibility due to the incorporation of bandstop filters; patient information, and physician and/or hospital information and other relevant information. The RFID tag may be affixed or disposed within the AIMD or leadwires of the lead system, or surgically implanted within a patient adjacent to the AIMD or leadwire system. | 12-23-2010 |
20100324639 | METHODOLOGY AND APPARATUS TO TERMINATE ABANDONED ACTIVE IMPLANTABLE MEDICAL DEVICE LEADS - An energy management system facilitates the transfer of high frequency energy coupled into an implanted abandoned lead at a selected RF frequency or frequency band, to an energy dissipating surface. This is accomplished by conductively coupling the implanted abandoned lead to the energy dissipating surface of an abandoned lead cap through an energy diversion circuit including one or more passive electronic network components whose impedance characteristics are at least partially tuned to the implanted abandoned lead's impedance characteristics. | 12-23-2010 |
20100324640 | ELECTRICALLY ISOLATING ELECTRICAL COMPONENTS IN A MEDICAL ELECTRICAL LEAD WITH AN ACTIVE FIXATION ELECTRODE - A lead body adapted for in-vivo implantation in a living subject includes a proximal end configured for electrical and mechanical connection to a therapy or a monitoring device, and a distal end. A collar is disposed at the distal end of the lead body, and a casing is disposed within the collar and is translatable along a central longitudinal axis of the collar. At least one electrical conductor extends substantially the length of the lead body, and an electronic component is disposed within the casing and conductively coupled to the electrical conductor. An electrode is mechanically connected to the casing and conductively coupled to the electronic component. A seal is disposed between the casing assembly and the collar to prevent passage of ionic fluid into the lead body through its distal end. | 12-23-2010 |
20100328049 | AIMD EXTERNAL PROGRAMMER INCORPORATING A MULTIFUNCTION RFID READER HAVING A LIMITED TRANSMIT TIME AND A TIME-OUT PERIOD - A system is provided for identifying implanted medical devices, leads and systems, as well as objects in close proximity to a patient having an implanted medical device (IMD), using a radio frequency identification (RFID) tag having retrievable information relating to the IMD, lead system and/or patient. An RFID tag communicator includes a circuit for limiting the total continuous transmit time of an interrogation signal, and a time-out circuit for delaying a second and any subsequent interrogation of the RFID tag. An external IMD programmer incorporating a multi-functional RFID reader is capable of identifying and communicating with various types of implanted medical devices, even if such devices are made by different manufacturers. | 12-30-2010 |
20100331932 | IMPLANTED LEAD SLEEVE HAVING RFID TAG - An identification device for an implantable lead includes an associated implantable sleeve and a radio frequency identification device (RFID) tag associated with the sleeve. The RFID tag includes information relating to the implantable lead, its associated lead system, or an associated implantable medical device. The RFID tag may be hermetically sealed within the sleeve and the sleeve selectively fixed along a length of the lead. The sleeve may comprise a loop forming an aperture, a crimped clamp device, a clamp device including a ratchet, clip, or rivet mechanism, or a clamp device including two separate clamshells, all of which allow for secure attachment to the lead. Alternatively, the sleeve may integrally be formed as part of the lead between a lead conductor and an insulated lumen. An external interrogator may be used for identifying information contained within the RFID tag. | 12-30-2010 |
20110001610 | MINIATURE HERMETICALLY SEALED RFID MICROELECTRONIC CHIP CONNECTED TO A BIOCOMPATIBLE RFID ANTENNA FOR USE IN CONJUNCTION WITH AN AIMD - An implantable radio frequency identification (RFID) tag includes a hermetically sealed biocompatible container, an RFID microelectronics chip is disposed within the container, and a biocompatible antenna extends from the RFID microelectronic chip and exteriorly of the container. In an exemplary embodiment the container comprises a housing for an active implantable medical device (AIMD). In another exemplary embodiment the RFID tag is associated with an AIMD. The AIMD may comprise a lead system. The RFID tag may be disposed within a non-hermetically sealed portion of the AIMD, such a header block, and may include information pertaining to the AIMD. Another exemplary embodiment may include a sensor conductively coupled to the RFID microelectronics chip. The sensor may be disposed exterior of or within the container. The sensor measures properties and activities of the human body and the RFID tag is capable of transmitting said measured properties in real time. | 01-06-2011 |
20110004283 | SHIELDED THREE-TERMINAL FLAT-THROUGH EMI/ENERGY DISSIPATING FILTER - A shielded three-terminal flat-through EMI/energy dissipating filter includes an active electrode plate through which a circuit current passes between a first terminal and a second terminal, a first shield plate on a first side of the active electrode plate, and a second shield plate on a second side of the active electrode plate opposite the first shield plate. The first and second shield plates are conductively coupled to a grounded third terminal. In preferred embodiments, the active electrode plate and the shield plates are at least partially disposed with a hybrid flat-through substrate that may include a flex cable section, a rigid cable section, or both. | 01-06-2011 |
20110022140 | METHODOLOGY AND APPARATUS TO TERMINATE ABANDONED ACTIVE IMPLANTABLE MEDICAL DEVICE LEADS - An energy management system facilitates the transfer of high frequency energy coupled into an implanted abandoned lead at a selected RF frequency or frequency band, to an energy dissipating surface. This is accomplished by conductively coupling the implanted abandoned lead to the energy dissipating surface of an abandoned lead cap through an energy diversion circuit including one or more passive electronic network components whose impedance characteristics are at least partially tuned to the implanted abandoned lead's impedance characteristics. | 01-27-2011 |
20110029043 | RFID-ENABLED AIMD PROGRAMMER SYSTEM FOR IDENTIFYING MRI COMPATIBILITY OF IMPLANTED LEADS - An RFID tag is associated with an implantable lead, its sensing or therapy delivery electrode, or a patient, for identifying the MRI compatibility of the implantable lead and/or the presence of a bandstop filter and its attendant characteristics. An RFID-enabled AIMD external telemetry programmer transmits an electromagnetic signal to establish a communication link with the RFID tag. | 02-03-2011 |
20110040343 | SWITCHED DIVERTER CIRCUITS FOR MINIMIZING HEATING OF AN IMPLANTED LEAD IN A HIGH POWER ELECTROMAGNETIC FIELD ENVIRONMENT - An energy management system that facilitates the transfer of high frequency energy induced on an implanted lead or a leadwire includes an energy dissipating surface associated with the implanted lead or the leadwire, a diversion or diverter circuit associated with the energy dissipating surface, and at least one switch for diverting energy in the implanted lead or the leadwire through the diversion circuit to the energy dissipating surface. In alternate configurations, the switch may be disposed between the implanted lead or the leadwire and the diversion circuit, or disposed so that it electrically opens the implanted lead or the leadwire when diverting energy through the diversion circuit to the energy dissipating surface. The switch may comprise a single or multi-pole double or single throw switch. The diversion circuit may be either a high pass filter or a low pass filter. | 02-17-2011 |
20110043297 | DUAL FUNCTION TUNED L-C INPUT TRAP PASSIVE EMI FILTER COMPONENT NETWORK FOR AN ACTIVE IMPLANTABLE MEDICAL DEVICE - Decoupling circuits are provided which transfer energy induced from an MRI pulsed RF field to the housing for an active implantable medical device (AIMD) which serves as an energy dissipating surface. A novel L-C input trap filter is provided which has a dual function. The L-C trap acts as a broadband low pass EMI filter while at the same time also acts as an L-C trap in order to divert induced RF energy from the lead to the housing of the AIMD. | 02-24-2011 |
20110054582 | SHIELDED NETWORK FOR AN ACTIVE MEDICAL DEVICE IMPLANTABLE LEAD - A shielded component or network for an active medical device (AMD) implantable lead includes (1) an implantable lead having a length extending from a proximal end to a distal end, all external of an AMD housing, (2) a passive component or network disposed somewhere along the length of the implantable lead, the passive component or network including at least one inductive component having a first inductive value, and (3) an electromagnetic shield substantially surrounding the inductive component or the passive network. The first inductive value of the inductive component is adjusted to a account for a shift in its inductance to a second inductive value when shielded. | 03-03-2011 |
20110057037 | PROCESS FOR TRANSFERRING PRODUCT INFORMATION UTILIZING BARCODE READER INTO PERMANENT MEMORY FOR AN IMPLANTED MEDICAL DEVICE - A barcode having product information is paired with an implantable medical device or component. The barcode is optically read and at least a portion of the product information is stored into a temporary memory. At least a portion of the product information stored in the temporary memory is electronically written to permanent memory of an RFID chip associated with the implanted medical device or component. | 03-10-2011 |
20110063088 | RFID DETECTION AND IDENTIFICATION SYSTEM FOR IMPLANTABLE MEDICAL DEVICES - An RFID tag is disposed within a hermetically sealed housing of an IMD. Low frequency RFID interrogators and tags are used, and the housing walls are made of materials, and/or are reduced in thickness, to facilitate RF communication between the RFID tag and an RFID reader/interrogator programmer. An RFID reader/interrogator may be used which has a limited transmit time and time-out period to avoid interference with the operation of the IMD. | 03-17-2011 |
20110066212 | TANK FILTERS PLACED IN SERIES WITH THE LEAD WIRES OR CIRCUITS OF ACTIVE MEDICAL DEVICES TO ENHANCE MRI COMPATABILITY - A TANK filter is provided for a lead wire of an active medical device (AMD). The TANK filter includes a capacitor in parallel with an inductor. The parallel capacitor and inductor are placed in series with the lead wire of the AMD, wherein values of capacitance and inductance are selected such that the TANK filter is resonant at a selected frequency. The Q of the inductor may be relatively maximized and the Q of the capacitor may be relatively minimized to reduce the overall Q of the TANK filter to attenuate current flow through the lead wire along a range of selected frequencies. In a preferred form, the TANK filter is integrated into a TIP and/or RING electrode for an active implantable medical device. | 03-17-2011 |
20110144734 | MEDICAL LEAD SYSTEM UTILIZING ELECTROMAGNETIC BANDSTOP FILTERS - Medical lead systems utilizing electromagnetic bandstop filters are provide which can be utilized in a magnetic resonance imaging (MRI) environment for patients who have implanted medical devices. The medical lead system includes an implanted lead having at least one bandstop filter associated therewith, for attenuating current flow through the lead over a range of frequencies. The bandstop filter has an overall circuit Q wherein the resultant 3 dB bandwidth is at least 10 kHz. The values of capacitance and inductance of the bandstop filter are selected such that the bandstop filter is resonant at a selected center frequency. Preferably, the bandstop filter has an overall circuit Q wherein the resultant 10 dB bandwidth is at least 10 kHz. Such bandstop filters are backwards compatible with known implantable deployment systems and extraction systems. | 06-16-2011 |
20110147062 | FEEDTHROUGH FLAT-THROUGH CAPACITOR - A feedthrough flat-through capacitor includes a capacitor having a first and second set of electrode plates, a first feedthrough passageway through the capacitor, a first lead disposed within the first feedthrough passageway and conductively coupled to the first set of electrode plates, a second feedthrough passageway through the capacitor disposed remote form the first feedthrough passageway, and a second lead disposed within the second feedthrough passageway and conductively coupled to the first set of electrode plates. The second set of electrode plates are typically conductively coupled to a ground. An EMI shield may be provided to electromagnetically isolate the first lead from the second lead. | 06-23-2011 |
20110201912 | TANK FILTERS PLACED IN SERIES WITH THE LEAD WIRES OR CIRCUITS OF ACTIVE MEDICAL DEVICES TO ENHANCE MRI COMPATIBILITY - A TANK filter is provided for a lead wire of an active medical device (AMD). The TANK filter includes a capacitor in parallel with an inductor. The parallel capacitor and inductor are placed in series with the lead wire of the AMD, wherein values of capacitance and inductance are selected such that the TANK filter is resonant at a selected frequency. The Q of the inductor may be relatively maximized and the Q of the capacitor may be relatively minimized to reduce the overall Q of the TANK filter to attenuate current flow through the lead wire along a range of selected frequencies. In a preferred form, the TANK filter is integrated into a TIP and/or RING electrode for an active implantable medical device. | 08-18-2011 |
20110208030 | TANK FILTERS PLACED IN SERIES WITH THE LEAD WIRES OR CIRCUITS OF ACTIVE MEDICAL DEVICES TO ENHANCE MRI COMPATABILITY - A TANK filter is provided for a lead wire of an active medical device (AMD). The TANK filter includes a capacitor in parallel with an inductor. The parallel capacitor and inductor are placed in series with the lead wire of the AMD, wherein values of capacitance and inductance are selected such that the TANK filter is resonant at a selected frequency. The Q of the inductor may be relatively maximized and the Q of the capacitor may be relatively minimized to reduce the overall Q of the TANK filter to attenuate current flow through the lead wire along a range of selected frequencies. In a preferred form, the TANK filter is integrated into a TIP and/or RING electrode for an active implantable medical device. | 08-25-2011 |
20110213232 | TANK FILTERS PLACED IN SERIES WITH THE LEAD WIRES OR CIRCUITS OF ACTIVE MEDICAL DEVICES TO ENHANCE MRI COMPATIBILITY - A TANK filter is provided for a lead wire of an active medical device (AMD). The TANK filter includes a capacitor in parallel with an inductor. The parallel capacitor and inductor are placed in series with the lead wire of the AMD, wherein values of capacitance and inductance are selected such that the TANK filter is resonant at a selected frequency. The Q of the inductor may be relatively maximized and the Q of the capacitor may be relatively minimized to reduce the overall Q of the TANK filter to attenuate current flow through the lead wire along a range of selected frequencies. In a preferred form, the TANK filter is integrated into a TIP and/or RING electrode for an active implantable medical device. | 09-01-2011 |
20110213233 | TANK FILTERS PLACED IN SERIES WITH THE LEAD WIRES OR CIRCUITS OF ACTIVE MEDICAL DEVICES TO ENHANCE MRI COMPATIBILITY - A TANK filter is provided for a lead wire of an active medical device (AMD). The TANK filter includes a capacitor in parallel with an inductor. The parallel capacitor and inductor are placed in series with the lead wire of the AMD, wherein values of capacitance and inductance are selected such that the TANK filter is resonant at a selected frequency. The Q of the inductor may be relatively maximized and the Q of the capacitor may be relatively minimized to reduce the overall Q of the TANK filter to attenuate current flow through the lead wire along a range of selected frequencies. In a preferred form, the TANK filter is integrated into a TIP and/or RING electrode for an active implantable medical device. | 09-01-2011 |
20110230943 | IMPLANTABLE LEAD FOR AN ACTIVE MEDICAL DEVICE HAVING AN INDUCTOR DESIGN MINIMIZING EDDY CURRENT LOSSES - A shielded component or network for an active medical device (AMD) implantable lead includes an implantable lead having a length extending from a proximal end to a distal end, all external of an AMD housing, and a passive component or network disposed somewhere along the length of the implantable lead. The passive component or network including at least one inductive component having a primary magnetic field line axis. A conductive shield or housing having a primary longitudinal axis substantially surrounds the inductive component or the passive network. The inductive component's magnetic field line axis is oriented substantially orthogonally to the primary longitudinal axis of the conductive shield or housing. | 09-22-2011 |
20110245644 | INTEGRATED TANK FILTER FOR A MEDICAL THERAPEUTIC DEVICE - A TANK filter is provided for a lead wire of an active medical device (AMD). The TANK filter includes a capacitor in parallel with an inductor. The parallel capacitor and inductor are placed in series with the lead wire of the AMD, wherein values of capacitance and inductance are selected such that the TANK filter is resonant at a selected frequency. The Q of the inductor may be relatively maximized and the Q of the capacitor may be relatively minimized to reduce the overall Q of the TANK filter to attenuate current flow through the lead wire along a range of selected frequencies. In a preferred form, the TANK filter is integrated into a TIP and/or RING electrode for an active implantable medical device. | 10-06-2011 |
20110288403 | MULTILAYER HELICAL WAVE FILTER FOR MRI APPLICATIONS - A multilayer helical wave filter having a primary resonance at a selected MRI RF pulsed frequency or frequency range, includes an elongated conductor forming at least a portion of an implantable medical lead. The elongated conductor includes a first helically wound segment having at least one planar surface, a first end and a second end, which forms a first inductive component, and a second helically wound segment having at least one planar surface, a first end and a second end, which forms a second inductive element. The first and second helically wound segments are wound in the same longitudinal direction and share a common longitudinal axis. Planar surfaces of the helically wound segments face one another, and a dielectric material is disposed between the facing planar surfaces of the helically wound segments and between adjacent coils of the helically wound segments, thereby forming a capacitance. | 11-24-2011 |
20110306860 | Band Stop Filter Employing a Capacitor and an Inductor Tank Circuit to Enhance MRI Compatibility of Active Medical Devices - A band stop filter is provided for a lead wire of an active medical device (AMD). The band stop filter includes a capacitor in parallel with an inductor. The parallel capacitor and inductor are placed in series with the lead wire of the AMD, wherein values of capacitance and inductance are selected such that the band stop filter is resonant at a selected frequency. The Q of the inductor may be relatively maximized and the Q of the capacitor may be relatively minimized to reduce the overall Q of the band stop filter to attenuate current flow through the lead wire along a range of selected frequencies. In a preferred form, the band stop filter is integrated into a TIP and/or RING electrode for an active implantable medical device. | 12-15-2011 |
20120029342 | MULTILAYER HELICAL WAVE FILTER FOR MEDICAL THERAPEUTIC OR DIAGNOSTIC APPLICATIONS - A multilayer helical wave filter having a primary resonance at a selected RF diagnostic or therapeutic frequency or frequency range, includes an elongated conductor forming at least a portion of an implantable medical lead. The elongated conductor includes a first helically wound segment having at least one planar surface, a first end and a second end, which forms a first inductive component, and a second helically wound segment having at least one planar surface, a first end and a second end, which forms a second inductive element. The first and second helically wound segments are wound in the same longitudinal direction and share a common longitudinal axis. Planar surfaces of the helically wound segments face one another, and a dielectric material is disposed between the facing planar surfaces of the helically wound segments and between adjacent coils of the helically wound segments, thereby forming a capacitance. | 02-02-2012 |
20120046723 | MEDICAL LEAD HAVING A BANDSTOP FILTER EMPLOYING A CAPACITOR AND AN INDUCTOR TANK CIRCUIT TO ENHANCE MRI COMPATIBILITY - A bandstop filter includes a capacitance in parallel with an inductance and is placed in series with the implantable lead of an active implantable medical device, wherein values of capacitance and inductance are selected such that the bandstop filter attenuates RF current flow at a selected center MRI RF pulsed frequency or across a range of frequencies. The Q | 02-23-2012 |
20120059445 | IMPLANTABLE LEAD BANDSTOP FILTER EMPLOYING AN INDUCTIVE COIL WITH PARASITIC CAPACITANCE TO ENHANCE MRI COMPATABILITY OF ACTIVE MEDICAL DEVICES - A medical lead system includes at least one bandstop filter for attenuating current flow through the lead across a range of frequencies. The bandstop filter has an overall circuit Q wherein the resultant 3 dB bandwidth is at least 10 kHz. The values of capacitance and inductance of the bandstop filter are selected such that the bandstop filter is resonant at a selected center frequency or range of frequencies. Preferably, the bandstop filter has an overall circuit Q wherein the resultant 10 dB bandwidth is at least 10 kHz. Such bandstop filters are backwards compatible with known implantable deployment systems and extraction systems. | 03-08-2012 |
20120071956 | IMPLANTABLE LEAD BANDSTOP FILTER EMPLOYING AN INDUCTIVE COIL WITH PARASITIC CAPACITANCE TO ENHANCE MRI COMPATIBILITY OF ACTIVE MEDICAL DEVICES - A medical lead system includes at least one bandstop filter for attenuating current flow through the lead across a range of frequencies. The bandstop filter has an overall circuit Q wherein the resultant 3 dB bandwidth is at least 10 kHz. The values of capacitance and inductance of the bandstop filter are selected such that the bandstop filter is resonant at a selected center frequency or range of frequencies. Preferably, the bandstop filter has an overall circuit Q wherein the resultant 10 dB bandwidth is at least 10 kHz. Such bandstop filters are backwards compatible with known implantable deployment systems and extraction systems. | 03-22-2012 |
20120078333 | MEDICAL LEAD SYSTEM UTILIZING ELECTROMAGNETIC BANDSTOP FILTERS - Medical lead systems utilizing electromagnetic bandstop filters are provide which can be utilized in a magnetic resonance imaging (MRI) environment for patients who have implanted medical devices. The medical lead system includes an implanted lead having at least one bandstop filter associated therewith, for attenuating current flow through the lead over a range of frequencies. The bandstop filter has an overall circuit Q wherein the resultant 3 dB bandwidth is at least 10 kHz. The values of capacitance and inductance of the bandstop filter are selected such that the bandstop filter is resonant at a selected center frequency. Preferably, the bandstop filter has an overall circuit Q wherein the resultant 10 dB bandwidth is at least 10 kHz. Such bandstop filters are backwards compatible with known implantable deployment systems and extraction systems. | 03-29-2012 |
20120083864 | MEDICAL LEAD SYSTEM UTILIZING ELECTROMAGNETIC BANDSTOP FILTERS - Medical lead systems utilizing electromagnetic bandstop filters are provide which can be utilized in a magnetic resonance imaging (MRI) environment for patients who have implanted medical devices. The medical lead system includes an implanted lead having at least one bandstop filter associated therewith, for attenuating current flow through the lead over a range of frequencies. The bandstop filter has an overall circuit Q wherein the resultant 3 dB bandwidth is at least 10 kHz. The values of capacitance and inductance of the bandstop filter are selected such that the bandstop filter is resonant at a selected center frequency. Preferably, the bandstop filter has an overall circuit Q wherein the resultant 10 dB bandwidth is at least 10 kHz. Such bandstop filters are backwards compatible with known implantable deployment systems and extraction systems. | 04-05-2012 |
20120127627 | MODULAR EMI FILTERED TERMINAL ASSEMBLY FOR AN ACTIVE IMPLANTABLE MEDICAL DEVICE - A modular EMI filtered terminal assembly for an active implantable medical device (AIMD) includes a hermetic terminal subassembly having at least one conductor extending through an insulator in non-conductive relation with the AIMD housing, and a feedthrough capacitor subassembly disposed generally adjacent to the hermetic terminal assembly. The feedthrough capacitor subassembly includes a conductive modular cup conductively coupled to the AIMD housing, and a feedthrough capacitor disposed within the modular cup. A first electrode plate or set of electrode plates is conductively coupled to the conductor, and a second electrode plate or set of electrode plates is conductively coupled to the modular cup. | 05-24-2012 |
20120139702 | Protection of a Medical Device Against RFID-Associated Electromagnetic Interference Like an Automobile Keyless Entry System Having an RFID Interrogator - A keyless entry system for an automobile is described. The keyless entry system comprises a radio frequency identification (RFID) tag that has been programmed to selectively unlock an automobile when the RFID tag is within a predetermined distance and, optionally, to lock the automobile when the RFID is outside the predetermined distance. An interrogator housed on or within the automobile comprises an actuatable RF signal generator for transmitting an electromagnetic signal and a time-out circuit. Regardless whether the programmed RFID tag is detected, or not, the RF signal generator transmits a first electromagnetic signal having a first limited total continuous transmit time, followed by an interim period of a defined length where the time-out circuit renders the interrogator incapable of transmitting the electromagnetic signal, followed by the RF signal generator transmitting a second electromagnetic signal having a second limited total continuous transmit time. | 06-07-2012 |
20120161901 | METHOD OF TUNING BANDSTOP FILTERS FOR IMPLANTABLE MEDICAL LEADS - A TANK filter is provided for a lead wire of an active medical device (AMD). The TANK filter includes a capacitor in parallel with an inductor. The parallel capacitor and inductor are placed in series with the lead wire of the AMD, wherein values of capacitance and inductance are selected such that the TANK filter is resonant at a selected frequency. The Q of the inductor may be relatively maximized and the Q of the capacitor may be relatively minimized to reduce the overall Q of the TANK filter to attenuate current flow through the lead wire along a range of selected frequencies. In a preferred form, the TANK filter is integrated into a TIP and/or RING electrode for an active implantable medical device. | 06-28-2012 |
20120188027 | Band Stop Filter Employing a Capacitor and an Inductor Tank Circuit to Enhance MRI Compatibility of Active Medical Devices - A band stop filter is provided for a lead wire of an active medical device (AMD). The band stop filter includes a capacitor in parallel with an inductor. The parallel capacitor and inductor are placed in series with the lead wire of the AMD, wherein values of capacitance and inductance are selected such that the band stop filter is resonant at a selected frequency. The Q of the inductor may be relatively maximized and the Q of the capacitor may be relatively minimized to reduce the overall Q of the band stop filter to attenuate current flow through the lead wire along a range of selected frequencies. In a preferred form, the band stop filter is integrated into a TIP and/or RING electrode for an active implantable medical device. | 07-26-2012 |
20120230003 | IONIZING RADIATION-PROTECTED ACTIVE IMPLANTABLE MEDICAL DEVICE - A radiation protected active implantable medical device includes an ionizing radiation shield disposed over at least one major surface of an electronics package, a microprocessor, or both contained within an AIMD housing. The ionizing radiation shield is made from a high atomic number, high atomic weight, high density material such as led, gold, platinum, iridium, tungsten or tantalum and has an atomic weight of at least 180 and a density of at least 11 grams per cubic centimeter. The ionizing radiation shield has a thickness of at least 0.25 millimeters and is preferably no thicker than 1.05 millimeters and has an overall attenuation of ionizing radiation of at least 0.5 HVL. | 09-13-2012 |
20120232609 | SECONDARY HEADER FOR AN IMPLANTABLE MEDICAL DEVICE INCORPORATING AN ISO DF4 CONNECTOR AND CONNECTOR CAVITY AND/OR AN IS4 CONNECTOR AND CONNECTOR CAVITY - A secondary header for an active implantable medical device (AIMD) incorporates a secondary header plug configured for mating insertion into an AIMD ISO DF4 or IS4 connector cavity, a secondary header ISO DF4 or IS4 connector cavity, and at least one replacement lead connector cavity. The secondary header plug has four electrical contacts which correspond to four electrical contacts of the AIMD connector cavity. The secondary header connector cavity has less than four electrical contacts conductively coupled to the secondary header plug electrical contacts. The replacement lead connector cavity has at least one electrical contact conductively coupled to at least one electrical contact of the secondary header plug. An intermediate conformal section between the secondary header plug and a housing for the secondary header connector cavity places the secondary header connector cavity housing adjacent to an exterior surface of the AIMD. | 09-13-2012 |
20120253340 | COMPOSITE RF CURRENT ATTENUATOR FOR A MEDICAL LEAD - A composite RF current attenuator for a medical lead includes a conductor having a distal electrode contactable to biological cells, a bandstop filter in series with the lead conductor for attenuating RF currents flow through the lead conductor at a selected center frequency or across a range of frequencies about the center frequency, and a lowpass filter in series with the bandstop filter and forming a portion of the lead conductor. The bandstop filter has a capacitance in parallel with a first inductance. In a preferred form, the lowpass filter includes a second inductance in series with the bandstop filter, wherein the values of capacitance and inductances for the composite RF current attenuator are selected such that it attenuates MRI-induced RF current flow in an MRI environment. | 10-04-2012 |
20120256704 | RF FILTER FOR AN ACTIVE MEDICAL DEVICE (AMD) FOR HANDLING HIGH RF POWER INDUCED IN AN ASSOCIATED IMPLANTED LEAD FROM AN EXTERNAL RF FIELD - An RF filter for an active medical device (AMD), for handling RF power induced in an associated lead from an external RF field at a selected MRI frequency or range frequencies includes a capacitor having a capacitance of between 100 and 10,000 picofarads, and a temperature stable dielectric having a dielectric constant of 200 or less and a temperature coefficient of capacitance (TCC) within the range of plus 400 to minus 7112 parts per million per degree centigrade. The capacitor's dielectric loss tangent in ohms is less than five percent of the capacitor's equivalent series resistance (ESR) at the selected MRI RF frequency or range of frequencies. | 10-11-2012 |
20120262250 | SHIELDED THREE-TERMINAL FLAT-THROUGH EMI/ENERGY DISSIPATING FILTER - A shielded three-terminal flat-through EMI/energy dissipating filter includes an active electrode plate through which a circuit current passes between a first terminal and a second terminal, a first shield plate on a first side of the active electrode plate, and a second shield plate on a second side of the active electrode plate opposite the first shield plate. The first and second shield plates are conductively coupled to a grounded third terminal. In preferred embodiments, the active electrode plate and the shield plates are at least partially disposed with a hybrid flat-through substrate that may include a flex cable section, a rigid cable section, or both. | 10-18-2012 |
20120265045 | PATIENT ATTACHED BONDING STRAP FOR ENERGY DISSIPATION FROM A PROBE OR A CATHETER DURING MAGNETIC RESONANCE IMAGING - A probe or catheter to patient RF coupling for magnetic resonance imaging includes a conductive grounding strap. The strap includes a first end spaced apart from a second end, the first end configured to be permanently or removably connectable to a conductive probe or catheter housing or a conductive probe or catheter interface of a probe or catheter. A conductive patient interface is configured to be removably connectable to a portion of a patient's body and electrically conductive between the conductive grounding strap and the patient's body. The conductive patient interface is attached at the second end of the conductive grounding strap and electrically coupled to the conductive probe or catheter housing or the conductive probe or catheter interface. An electrical circuit is formed between the patient's body, the conductive patient interface, the conductive grounding strap, and the conductive probe or catheter housing or interface. | 10-18-2012 |
20120277841 | BAND STOP FILTER EMPLOYING A CAPACITOR AND AN INDUCTOR TANK CIRCUIT TO ENHANCE MRI COMPATIBILITY OF ACTIVE MEDICAL DEVICES - A band stop filter is provided for a lead wire of an active medical device (AMD). The band stop filter includes a capacitor in parallel with an inductor. The parallel capacitor and inductor are placed in series with the lead wire of the AMD, wherein values of capacitance and inductance are selected such that the band stop filter is resonant at a selected frequency. The Q of the inductor may be relatively maximized and the Q of the capacitor may be relatively minimized to reduce the overall Q of the band stop filter to attenuate current flow through the lead wire along a range of selected frequencies. In a preferred form, the band stop filter is integrated into a TIP and/or RING electrode for an active implantable medical device. | 11-01-2012 |
20120296190 | MULTILAYER HELICAL WAVE FILTER FOR MEDICAL THERAPEUTIC OR DIAGNOSTIC APPLICATIONS - A multilayer helical wave filter having a primary resonance at a selected RF diagnostic or therapeutic frequency or frequency range, includes an elongated conductor forming at least a portion of an implantable medical lead. The elongated conductor includes a first helically wound segment having at least one planar surface, a first end and a second end, which forms a first inductive component, and a second helically wound segment having at least one planar surface, a first end and a second end, which forms a second inductive element. The first and second helically wound segments are wound in the same longitudinal direction and share a common longitudinal axis. Planar surfaces of the helically wound segments face one another, and a dielectric material is disposed between the facing planar surfaces of the helically wound segments and between adjacent coils of the helically wound segments, thereby forming a capacitance. | 11-22-2012 |
20130046354 | IMPLANTABLE CARDIOVERTER DEFIBRILLATOR DESIGNED FOR USE IN A MAGNETIC RESONANCE IMAGING ENVIRONMENT - An implantable cardioverter defibrillator includes a communication interface operable to receive a communication signal from an external programmer. The communication signal includes a command to switch the ICD from a first mode to a second mode. A processor is in electrical communication with the communication interface and configured to switch the ICD between the first and second modes. A battery is configured to supply low DC voltage. A converter is configured to convert the low DC voltage to a high DC voltage. An energy storage capacitor is electrically coupled to the converter and configured to store a therapeutic energy or high DC voltage including at least 15 joules. The second mode includes activating the converter to convert the low DC voltage to the high DC voltage and storing the therapeutic energy or at least 15 joules within the energy storage capacitor during a period of time of the second mode. | 02-21-2013 |
20130070387 | DUAL STAGE EMI FILTER AND OFFSET HIGHLY EFFICIENT MULTI-POLAR ACTIVE CAPACITOR ELECTRODES FOR AN ACTIVE IMPLANTABLE MEDICAL DEVICE - A multipolar feedthrough filter capacitor assembly for an active implantable medical device includes a feedthrough filter capacitor including a first active electrode plate, a second active electrode plate and a plurality of ground electrode plates. The plates are in spaced parallel relation disposed within a monolithic dielectric substrate where the first and second active electrode plates are disposed between the plurality of ground electrode plates. A first conductive terminal pin is disposed through the feedthrough filter capacitor electrically coupled to the first active electrode plate and in non-conductive relation to both the second active electrode plate and ground electrode plate. A second conductive terminal pin may be disposed through the feedthrough filter capacitor electrically coupled to the second active electrode plate and in non-conductive relation to both the first active electrode plate and ground electrode plate. | 03-21-2013 |
20130073021 | BAND STOP FILTER EMPLOYING A CAPACITOR AND AN INDUCTOR TANK CIRCUIT TO ENHANCE MRI COMPATIBILITY OF ACTIVE MEDICAL DEVICES - An implantable lead includes a lead conductor having a length extending from a proximal end to a distal end. A self-resonant inductor is connected in series along a portion of the length of the lead conductor. The self-resonant inductor includes a single length of conductive material including a dielectric coating substantially surrounding the single length of conductive material. The self-resonant inductor includes a first coiled or spiral conductor disposed along an inductor section spanning in a first direction from a first location to a second location. A second coiled or spiral conductor is disposed along the inductor section spanning in a second direction from the second location to the first location, where the second direction is opposite the first direction. A third coiled or spiral conductor is disposed along the inductor section spanning in the first direction from the first location to the second location. | 03-21-2013 |
20130184796 | Elevated Hermetic Feedthrough Insulator Adapted for Side Attachment of Electrical Conductors on the Body Fluid Side of an Active Implantable Medical Device - An elevated feedthrough is attachable to a top or a side of an active implantable medical device. The feedthrough includes a conductive ferrule and a dielectric substrate. The dielectric substrate is defined as comprising a body fluid side and a device side disposed within the conductive ferrule. The dielectric substrate includes a body fluid side elevated portion generally raised above the conductive ferrule. At least one via hole is disposed through the dielectric substrate from the body fluid side to the device side. A conductive fill is disposed within the at least one via hole forming a hermetic seal and electrically conductive between the body fluid side and the device side. A leadwire connection feature is on the body fluid side electrically coupled to the conductive fill and disposed adjacent to the elevated portion of the dielectric substrate. | 07-18-2013 |
20130184797 | CO-FIRED HERMETICALLY SEALED FEEDTHROUGH WITH ALUMINA SUBSTRATEAND PLATINUM FILLED VIA FOR AN ACTIVE IMPLANTABLE MEDICAL DEVICE - A co-fired hermetically sealed feedthrough is attachable to an active implantable medical device. The feedthrough comprises an alumina dielectric substrate comprising at least 96 or 99% alumina. A via hole is disposed through the alumina dielectric substrate from a body fluid side to a device side. A substantially closed pore, fritless and substantially pure platinum fill is disposed within the via hole forming a platinum filled via electrically conductive between the body fluid side and the device side. A hermetic seal is between the platinum fill and the alumina dielectric substrate, wherein the hermetic seal comprises a tortuous and mutually conformal interface between the alumina dielectric substrate and the platinum fill. | 07-18-2013 |
20130201005 | RFID INTERROGATOR CONFIGURED FOR PROTECTION AGAINST ELECTROMAGNETIC INTERFERENCE OF A REMOTE DEVICE HAVING AN RFID TAG - An RFID tag interrogator is described. The interrogator comprises a time-out circuit and an actuatable RF signal generator for transmitting an electromagnetic signal. Upon first actuation, the RF signal generator transmits a first electromagnetic signal having a first limited total continuous transmit time that is no longer than a predetermined transmit-time. That transmission is followed by an interim period of a defined length where the time-out circuit renders the interrogator incapable of transmitting the electromagnetic signal. The interim period is followed by the RF signal generator transmitting a second electromagnetic signal having a second limited total continuous transmit time that is no longer than the predetermined transmit time. The time-out circuit prevents the first, second and subsequent transmissions of the electromagnetic signal that are each no longer than the predetermined transmit time after a prior electromagnetic signal has been transmitted until the interim period has expired. | 08-08-2013 |
20130226262 | SATELLITE THERAPY DELIVERY SYSTEM FOR BRAIN NEUROMODULATION - Deep brain electrodes are remotely sensed and activated by means of a remote active implantable medical device (AIMD). In a preferred form, a pulse generator is implanted in the pectoral region and includes a hermetic seal through which protrudes a conductive leadwire which provides an external antenna for transmission and reception of radio frequency (RF) pulses. One or more deep brain electrode modules are constructed and placed which can transmit and receive RF energy from the pulse generator. An RF telemetry link is established between the implanted pulse generator and the deep brain electrode assemblies. The satellite modules are configured for generating pacing pulses for a variety of disease conditions, including epileptic seizures, Turrets Syndrome, Parkinson's Tremor, and a variety of other neurological or brain disorders. | 08-29-2013 |
20130226273 | SHIELDED TORQUE CARRIER FOR A PASSIVE ELECTRONIC COMPONENT IN AN ACTIVE MEDICAL DEVICE IMPLANTABLE LEAD - A shielded component or network for an active medical device (AMD) implantable lead includes (1) an implantable lead having a length extending from a proximal end to a distal end, all external of an AMD housing, (2) a passive component or network disposed somewhere along the length of the implantable lead, the passive component or network including at least one inductive component having a first inductive value, and (3) an electromagnetic shield substantially surrounding the inductive component or the passive network. The first inductive value of the inductive component is adjusted to a account for a shift in its inductance to a second inductive value when shielded. | 08-29-2013 |
20130235550 | INTERNALLY GROUNDED FLAT THROUGH FILTER WITH HERMETICALLY SEALED INSULATIVE BODY WITH INTERNAL GROUND PLATES - A shielded three-terminal flat-through EMI/energy dissipating filter includes an active electrode plate through which a circuit current passes between a first terminal and a second terminal, a first shield plate on a first side of the active electrode plate, and a second shield plate on a second side of the active electrode plate opposite the first shield plate. The first and second shield plates are conductively coupled to a grounded third terminal. In preferred embodiments, the active electrode plate and the shield plates are at least partially disposed with a hybrid flat-through substrate that may include a flex cable section, a rigid cable section, or both. | 09-12-2013 |
20130245413 | ELECTROMAGNETIC SHIELD FOR A PASSIVE ELECTRONIC COMPONENT IN AN ACTIVE MEDICAL DEVICE IMPLANTABLE LEAD - A shielded component or network for an active medical device (AMD) implantable lead includes (1) an implantable lead having a length extending from a proximal end to a distal end, all external of an AMD housing, (2) a passive component or network disposed somewhere along the length of the implantable lead, the passive component or network including at least one inductive component having a first inductive value, and (3) an electromagnetic shield substantially surrounding the inductive component or the passive network. The first inductive value of the inductive component is adjusted to a account for a shift in its inductance to a second inductive value when shielded. | 09-19-2013 |
20130253297 | SWITCHED DIVERTER CIRCUITS FOR MINIMIZING HEATING OF AN IMPLANTED LEAD AND/OR PROVIDING EMI PROTECTION IN A HIGH POWER ELECTROMAGNETIC FIELD ENVIRONMENT - An energy management system that facilitates the transfer of high frequency energy induced on an implanted lead or a leadwire includes an energy dissipating surface associated with the implanted lead or the leadwire, a diversion or diverter circuit associated with the energy dissipating surface, and at least one non-linear circuit element switch for diverting energy in the implanted lead or the leadwire through the diversion circuit to the energy dissipating surface. In alternate configurations, the switch may be disposed between the implanted lead or the leadwire and the diversion circuit, or disposed so that it electrically opens the implanted lead or the leadwire when diverting energy through the diversion circuit to the energy dissipating surface. The non-linear circuit element switch is typically a PIN diode. The diversion circuit may be either a high pass filter or a low pass filter. | 09-26-2013 |
20130286537 | EMI FILTERS UTILIZING COUNTER-BORED CAPACITORS TO FACILITATE SOLDER RE-FLOW - An EMI filtered terminal assembly including at least one conductive terminal pin, a feedthrough capacitor, and a counter-bore associated with a passageway through the capacitor is described. Preferably, the feedthrough capacitor having counter-drilled or counter-bored holes on its top side is first bonded to a hermetic insulator. The counter-drilled or counter-bore holes in the capacitor provide greater volume for the electro-mechanical attachment between the capacitor and the terminal pin or lead wire, permitting robotic dispensing of, for example, thermal-setting conductive adhesive. | 10-31-2013 |
20130289666 | SWITCHED SAFETY PROTECTION CIRCUIT FOR AN AIMD SYSTEM DURING EXPOSURE TO HIGH POWER ELECTROMAGNETIC FIELDS - An energy management system that facilitates the transfer of high frequency energy induced on an implanted lead or a leadwire includes an energy dissipating surface associated with the implanted lead or the leadwire, a diversion or diverter circuit associated with the energy dissipating surface, and at least one switch disposed between the diversion circuit and the AIMD electronics for diverting energy in the implanted lead or the leadwire through the diversion circuit to the energy dissipating surface. The switch may comprise a single or multi-pole double or single throw switch. The diversion circuit may be either a high pass filter or a low pass filter. | 10-31-2013 |
20130317345 | IMPLANTABLE CARDIOVERTER DEFIBRILLATOR DESIGNED FOR USE IN A MAGNETIC RESONANCE IMAGING ENVIRONMENT - An implantable cardioverter defibrillator includes a communication interface operable to receive a communication signal from an external programmer. The communication signal includes a command to switch the ICD from a first mode to a second mode. A processor is in electrical communication with the communication interface and configured to switch the ICD between the first and second modes. A battery is configured to supply low DC voltage. A converter is configured to convert the low DC voltage to a high DC voltage. An energy storage capacitor is electrically coupled to the converter and configured to store a therapeutic energy or high DC voltage including at least 15 joules. The second mode includes activating the converter to convert the low DC voltage to the high DC voltage and storing the therapeutic energy or at least 15 joules within the energy storage capacitor during a period of time of the second mode. | 11-28-2013 |
20130317584 | HEADER EMBEDDED FILTER FOR IMPLANTABLE MEDICAL DEVICE - A header block is configured to be attachable to an implantable medical device. The header block includes a header block body and a connection port disposed in the header block body configured to receive an implantable lead. A conductor is disposed in the header block body electrically coupled to the connection port at a first end and connectable at a second end to the implantable medical device. An impeding device is electrically coupled in series along the length of the conductor and disposed within the header block body. The impeding device is configured to raise the high-frequency impedance of the conductor. The impeding device may include a bandstop filter or an L-C tank circuit. | 11-28-2013 |
20140036409 | EMI Filtered Co-Connected Hermetic Feedthrough, Feedthrough Capacitor and Leadwire Assembly for an Active Implantable Medical Device - A co-connected hermetic feedthrough, feedthrough capacitor, and leadwire assembly includes a dielectric substrate with a via hole disposed through the dielectric substrate from a body fluid side to a device side. A conductive fill is disposed within the via forming a hermetic seal and is electrically conductive between the body fluid side and the device side. A feedthrough capacitor is attached to the dielectric substrate and includes a capacitor dielectric substrate, an unfilled capacitor via hole including an inner metallization, a set of capacitor active electrode plates electrically coupled to the inner metallization, an outer metallization disposed and a set of capacitor ground electrode plates electrically coupled to the outer metallization. A conductive leadwire is disposed within the unfilled capacitor via hole. An electrical joint connects the conductive fill, the capacitor inner metallization along with the capacitor active electrode plates and the conductive leadwire. | 02-06-2014 |
20140074211 | BAND STOP FILTER COMPRISING AN INDUCTIVE COMPONENT DISPOSED IN A LEAD WIRE IN SERIES WITH AN ELECTRODE - A band stop filter is provided for a lead wire of an active medical device (AMD). The band stop filter includes a capacitor in parallel with an inductor. The parallel capacitor and inductor are placed in series with the lead wire of the AMD, wherein values of capacitance and inductance are selected such that the band stop filter is resonant at a selected frequency. The Q of the inductor may be relatively maximized and the Q of the capacitor may be relatively minimized to reduce the overall Q of the band stop filter to attenuate current flow through the lead wire along a range of selected frequencies. In a preferred form, the band stop filter is integrated into a TIP and/or RING electrode for an active implantable medical device. | 03-13-2014 |
20140161973 | CO-FIRED HERMETICALLY SEALED FEEDTHROUGH WITH ALUMINA SUBSTRATE AND PLATINUM FILLED VIA FOR AN ACTIVE IMPLANTABLE MEDICAL DEVICE - A co-fired hermetically sealed feedthrough is attachable to an active implantable medical device. The feedthrough comprises an alumina dielectric substrate comprising at least 96 or 99% alumina. A via hole is disposed through the alumina dielectric substrate from a body fluid side to a device side. A substantially closed pore, fritless and substantially pure platinum fill is disposed within the via hole forming a platinum filled via electrically conductive between the body fluid side and the device side. A hermetic seal is between the platinum fill and the alumina dielectric substrate, wherein the hermetic seal comprises a tortuous and mutually conformal interface between the alumina dielectric substrate and the platinum fill. | 06-12-2014 |
20140168850 | RF FILTER FOR AN ACTIVE MEDICAL DEVICE (AMD) FOR HANDLING HIGH RF POWER INDUCED IN AN ASSOCIATED IMPLANTED LEAD FROM AN EXTERNAL RF FIELD - An RF filter for an active medical device (AMD), for handling RF power induced in an associated lead from an external RF field at a selected MRI frequency or range frequencies includes a capacitor having a capacitance of between 100 and 10,000 picofarads, and a temperature stable dielectric having a dielectric constant of 200 or less and a temperature coefficient of capacitance (TCC) within the range of plus 400 to minus 7112 parts per million per degree centigrade. The capacitor's dielectric loss tangent in ohms is less than five percent of the capacitor's equivalent series resistance (ESR) at the selected MRI RF frequency or range of frequencies. | 06-19-2014 |
20140168917 | LOW INDUCTANCE AND LOW RESISTANCE HERMETICALLY SEALED FILTERED FEEDTHROUGH FOR AN AIMD - A hermetically sealed filtered feedthrough includes a chip capacitor disposed on a circuit board on a device side. A first low impedance electrical connection is between a capacitor first end metallization and a conductor which is disposed through an insulator. A second low impedance electrical connection is between the capacitor second end metallization and a ferrule or housing. The second low impedance electrical connection may include an oxide-resistant electrical connection forming the hermetic seal between the insulator and the ferrule or housing and an electrical connection between and to the second end metallization and directly to the oxide-resistant electrical connection. Alternatively, the second low impedance electrical connection may include an oxide-resistant metal addition attached directly to the ferrule or housing and an electrical connection between and to the second end metallization and directly to the oxide-resistant metal addition. | 06-19-2014 |
20140172059 | IMPLANTABLE LEAD HAVING A SHIELDED BANDSTOP FILTER COMPRISING A SELF-RESONANT INDUCTOR FOR AN ACTIVE MEDICAL DEVICE - A shielded component or network for an active medical device (AMD) implantable lead includes (1) an implantable lead having a length extending from a proximal end to a distal end, all external of an AMD housing, (2) a passive component or network disposed somewhere along the length of the implantable lead, the passive component or network including at least one inductive component having a first inductive value, and (3) an electromagnetic shield substantially surrounding the inductive component or the passive network. The first inductive value of the inductive component is adjusted to a account for a shift in its inductance to a second inductive value when shielded. | 06-19-2014 |
20140194964 | LOW IMPEDANCE OXIDE RESISTANT GROUNDED CAPACITOR FOR AN AIMD - A hermetically sealed filtered feedthrough assembly for an AIMD includes an insulator hermetically sealed to a conductive ferrule or housing. A conductor is hermetically sealed and disposed through the insulator in non-conductive relation to the conductive ferrule or housing between a body fluid side and a device side. A feedthrough capacitor is disposed on the device side. A first low impedance electrical connection is between a first end metallization of the capacitor and the conductor. A second low impedance electrical connection is between a second end metallization of the capacitor and the ferrule or housing. The second low impedance electrical connection includes an oxide-resistant metal addition attached directly to the ferrule or housing and an electrical connection coupling the second end metallization electrically and physically directly to the oxide-resistant metal addition. | 07-10-2014 |
20140240060 | EMI FILTER EMPLOYING A SELF-RESONANT INDUCTOR BANDSTOP FILTER HAVING OPTIMUM INDUCTANCE AND CAPACITANCE VALUES - A bandstop filter having optimum component values is provided for a lead of an active implantable medical device (AIMD). The bandstop filter includes a capacitor in parallel with an inductor. The parallel capacitor and inductor are placed in series with the implantable lead of the AIMD, wherein values of capacitance and inductance are selected such that the bandstop filter is resonant at a selected frequency. The Q of the inductor may be relatively maximized and the Q of the capacitor may be relatively minimized to reduce the overall Q of the bandstop filter to attenuate current flow through the implantable lead along a range of selected frequencies. | 08-28-2014 |
20140243944 | HEADER BLOCK FOR AN AIMD WITH AN ABANDONED LEAD CONNECTOR CAVITY - A header for an active implantable medical device includes a header block body and at least one active connector cavity configured to be attachable to an active lead. A first conductive leadwire has a first and second end, where the first end of the first conductive leadwire is electrically connected to the at least one active connector cavity and the second end of the first conductive leadwire is connectable to a hermetic terminal of the active implantable medical device. At least one abandoned connector cavity is located within the header block body configured to attachable to an abandoned lead. A second conductive leadwire has a first and second end, where the first end of the second conductive leadwire is electrically connected to the at least one abandoned connector cavity and the second end of the second conductive leadwire is connectable to the active implantable medical device housing. | 08-28-2014 |
20140275968 | SURROGATE IMPLANTED MEDICAL DEVICE FOR ENERGY DISSIPATION OF EXISTING IMPLANTED LEADS DURING MRI SCANS - A surrogate implantable medical device includes a thermally conductive and electrically conductive housing. A header connector block includes a header block body, where the header block body is attached to the housing. At least one connector cavity is located within the header block body and configured to be attachable to an implantable lead. At least one conductive leadwire is disposed at least partially within the header block body having a first end and a second end. The at least one conductive leadwire's first end is electrically connected to the at least one connector cavity and the at least one conductive leadwire's second end is electrically connected to the housing. The housing does not contain active electronics. | 09-18-2014 |
20140288619 | SWITCHED DIVERTER CIRCUITS FOR MINIMIZING HEATING OF AN IMPLANTED LEAD AND/OR PROVIDING EMI PROTECTION IN A HIGH POWER ELECTROMAGNETIC FIELD ENVIRONMENT - An energy management system that facilitates the transfer of high frequency energy induced on an implanted lead or a leadwire includes an energy dissipating surface associated with the implanted lead or the leadwire, a diversion or diverter circuit associated with the energy dissipating surface, and at least one non-linear circuit element switch for diverting energy in the implanted lead or the leadwire through the diversion circuit to the energy dissipating surface. In alternate configurations, the switch may be disposed between the implanted lead or the leadwire and the diversion circuit, or disposed so that it electrically opens the implanted lead or the leadwire when diverting energy through the diversion circuit to the energy dissipating surface. The non-linear circuit element switch is typically a PIN diode. The diversion circuit may be either a high pass filter or a low pass filter. | 09-25-2014 |
20140296952 | ELECTROMAGNETIC SHIELD FOR A PASSIVE ELECTRONIC COMPONENT IN AN ACTIVE MEDICAL DEVICE IMPLANTABLE LEAD - A shielded component or network for an active medical device (AMD) implantable lead includes an implantable lead having a length extending from a proximal end to a distal end, all external of an AMD housing, a passive component or network disposed somewhere along the length of the implantable lead, the passive component or network including at least one inductive component having a first inductive value, and an electromagnetic shield substantially surrounding the inductive component or the passive network. The first inductive value of the inductive component is adjusted to account for a shift in its inductance to a second inductive value when shielded. | 10-02-2014 |
20140330355 | IMPLANTABLE LEAD HAVING MULTI-PLANAR SPIRAL INDUCTOR FILTER - A multilayer helical wave filter having a primary resonance at a selected RF diagnostic or therapeutic frequency or frequency range, includes an elongated conductor forming at least a portion of an implantable medical lead. The elongated conductor includes a first helically wound segment having at least one planar surface, a first end and a second end, which forms a first inductive component, and a second helically wound segment having at least one planar surface, a first end and a second end, which forms a second inductive element. The first and second helically wound segments are wound in the same longitudinal direction and share a common longitudinal axis. Planar surfaces of the helically wound segments face one another, and a dielectric material is disposed between the facing planar surfaces of the helically wound segments and between adjacent coils of the helically wound segments, thereby forming a capacitance. | 11-06-2014 |
20140330357 | INDEPENDENTLY ACTUATABLE SWITCH FOR SELECTION OF AN MRI COMPATIBLE BANDSTOP FILTER PLACED IN SERIES WITH A PARTICULAR THERAPY ELECTRODE OF AN ACTIVE IMPLANTABLE MEDICAL DEVICE - An MRI-compatible electronic medical therapy system includes an active medical device connected to a plurality of electrodes. An independently actuatable switch selectively electrically connects at least one circuit protection device in electrical series with the electrodes and the medical device. The circuit protection device is adapted to permit current flow therethrough during normal medical device related therapy, but substantially prevent current flow therethrough in the presence of an induced electromagnetic field. | 11-06-2014 |
20150066124 | FILTER CIRCUIT FOR AN ACTIVE IMPLANTABLE MEDICAL DEVICE - A shielded three-terminal flat-through EMI/energy dissipating filter includes an active electrode plate through which a circuit current passes between a first terminal and a second terminal, a first shield plate on a first side of the active electrode plate, and a second shield plate on a second side of the active electrode plate opposite the first shield plate. The first and second shield plates are conductively coupled to a grounded third terminal. In preferred embodiments, the active electrode plate and the shield plates are at least partially disposed with a hybrid flat-through substrate that may include a flex cable section, a rigid cable section, or both. | 03-05-2015 |