Patent application number | Description | Published |
20090099440 | REDUCTION OF RF INDUCED TISSUE HEATING USING DISCRETE WINDING PATTERNS - The present invention provides, among other things, a medical device having an elongated body and an electrically conductive coil wrapped around the elongated body and covering at least a lengthwise portion of the body. The coil includes a pattern of insulated and non-insulated portions. | 04-16-2009 |
20090099555 | REDUCTION OF RF INDUCED TISSUE HEATING USING CONDUCTIVE SURFACE PATTERN - The present invention provides, among other things, means to suppress AC current propagation along elongated medical devices incorporating long conductive structures. AC currents in the frequency range from approximately 10 MHz to 3 GHz can be substantially suppressed without altering the low and DC frequency response of the medical device. | 04-16-2009 |
20110034983 | IMPLANTABLE MEDICAL DEVICE LEAD INCORPORATING A CONDUCTIVE SHEATH SURROUNDING INSULATED COILS TO REDUCE LEAD HEATING DURING MRI - A conducting sheath is provided along at least a portion of an implantable medical device lead, and preferably along substantially its entire length, for mitigating heating problems arising during magnetic resonance imaging (MRI) procedures, particularly problems arising due to a problem described herein as the “coiling effect.” During device implant, the clinician may elect to wrap or coil excess proximal portions of leads around or under the medical device being implanted. Thereafter, during MRI procedures, shunt capacitance may develop between the housing of the implantable device and insulated coils within the proximal portions of the lead that are near the device, resulting in greater lead heating during the MRI. The conducting sheath helps suppress induced currents and also reduces or eliminates shunt capacitance. The conducting sheath may be, for example, formed using a metal mesh or a conducting polymer tube incorporating non-ferrous metal powders. The sheath may be formed in ¼ wavelength segments. | 02-10-2011 |
20110106231 | MRI-COMPATIBLE IMPLANTABLE LEAD HAVING A HEAT SPREADER AND METHOD OF USING SAME - An implantable lead is provided that comprises a lead body and a header assembly. The lead body has a distal end and a proximal end. The lead body is configured to be implanted in a patient. The header assembly is provided at the distal end of the lead body and includes an internal chamber and a tissue engaging end. An electrode is provided on the header assembly. The electrode is configured to deliver a stimulating pulse. A resonant inductor is located within the chamber in the header assembly. An electrically floating heat spreader is provided on the header assembly. The heat spreader is located proximate to the resonant inductor and is positioned on the header assembly to cover at least a portion of the resonant inductor. The heat spreader is thermally coupled to the resonant inductor to convey thermal energy away from the header assembly. | 05-05-2011 |
20110125240 | BIOCOMPATIBLE INDUCTOR FOR IMPLANTABLE LEAD AND METHOD OF MAKING SAME - A biocompatible inductor for an implantable medical lead is disclosed herein. In one embodiment the biocompatible inductor may include a biocompatible bobbin and a wire wound about a barrel of the biocompatible bobbin to form a coil. The wire may include an electrically conductive core, an electrically conductive biocompatible jacket extending over the core, and a coating of high dielectric strength insulation material extending over the jacket. Additionally, the biocompatible inductor may include medical adhesive located in gaps within the coil and a polyester shrink tube covering the coil. | 05-26-2011 |
20110144722 | MRI-COMPATIBLE IMPLANTABLE LEAD WITH IMPROVED LC RESONANT COMPONENT - An implantable lead is provided that comprises a lead body extending along a longitudinal axis. The lead body includes a distal end and a proximal end and a lumen within the lead body. The lead also includes a header assembly provided at the distal end of the lead body. The header assembly includes a tissue engaging end. The lead also includes an electrode provided on the header assembly. The electrode is configured to deliver stimulating pulses. The lead also includes an electrode conductor provided within the lumen of the lead body and extending from the electrode to the proximal end of the lead body. An LC resonant component is provided in at least one of the lead body and the header assembly. The LC resonant component comprises a capacitor having an elongated shape that extends along the longitudinal axis of the lead body. The capacitor has a core that is located about the longitudinal axis of the lead body. The LC resonant component further comprises an inductor wire wound in multiple turns about an exterior surface of the capacitor to form an inductor. | 06-16-2011 |
Patent application number | Description | Published |
20090102484 | BANDWIDTH EXPANSION IN MAGNETIC RESONANCE - A magnetic resonance imaging system includes a primary magnet and a secondary magnet operable to produce magnetic fields within a sample being imaged. The MRI system further includes at least one RF coil that is operable to receive electromagnetic frequencies from the sample. The RF coil is formed from tubing that serves as a cooling conduit through which flows a cooling fluid provided by a cooling source. The cooling fluid cools the RF coils to improve imaging of the sample. | 04-23-2009 |
20100321020 | BANDWIDTH EXPANSION IN MAGNETIC RESONANCE - An apparatus for use in a magnetic resonance examination includes a radio frequency receive coil ( | 12-23-2010 |
20110079423 | MRI COMPATIBLE IMPLANTABLE LEAD - An implantable lead is provided that includes a lead body configured to be implanted in a patient. The lead body has a distal end and a proximal end, and a lumen extending between the distal and proximal ends and includes a connector assembly provided at the proximal end of the lead body. The connector assembly is configured to connect to an implantable medical device and includes an electrode provided proximate to the distal end of the lead body with the electrode configured to at least one of deliver stimulating pulses and sense electrical activity. A multi-layer coil is located within the lumen and extends at least partially along a length of the lead body. The coil includes a first winding formed with multiple winding turns, the winding turns being segmented in an alternating pattern of insulated segments and non-insulated segments along the length of the lead body. The multi-layer coil further includes a winding turn connective layer extending along and interconnecting the winding turns within at least one of the non-insulated segments. The multi-layer coil further includes a first winding formed with multiple winding turns, the winding turns being segmented into an alternating pattern of insulated segments and non-insulated segments along a length of the winding with a winding turn connective layer extending along and interconnecting the winding turns within at least one of the non-insulated segments. | 04-07-2011 |
20110301676 | REDUCING RESONANT CURRENTS IN A RESONATING CIRCUIT DURING MRI SCANS - An implantable medical lead configured to reduce resonant currents in a resonating circuit during MRI scans and a method of manufacturing the same are disclosed herein. The method of manufacturing includes providing a medical lead comprising an electrical pathway from a tip electrode located at a distal end of the lead to a lead connector located at a proximal end and coupling a resonating circuit to the tip electrode such that the resonating circuit is in the electrical pathway for the tip electrode. Further, the method includes coupling a capacitive element to a proximal end of the resonating circuit. The capacitive element is configured to shunt at least part of an RF current induced on the electrical pathway into surrounding tissue or fluid and also works as a heat sink to spread the heat from the internal LC resonant circuit. | 12-08-2011 |