Patent application number | Description | Published |
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 |
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 |
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 |
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 |
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 |
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 |
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 |
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 |
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 |
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 |
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 |
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 |
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 |
20120035698 | 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. | 02-09-2012 |
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 |
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 |
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 |
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 |
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 |