IMPLANTABLE MEDICAL DEVICE LEAD INCORPORATING A CONDUCTIVE SHEATH SURROUNDING INSULATED COILS TO REDUCE LEAD HEATING DURING MRI
First Claim
1. A lead for use with an implantable medical device for implant within a patient, the lead comprising:
- an electrode for placement adjacent patient tissues;
a conductor operative to route signals along the lead between the electrode and the implantable medical device, with a portion of the conductor formed as an insulated coil and configured to function as an inductive bandstop filtering element for filtering radio-frequency (RF) fields; and
a conducting sheath surrounding at least a portion of the conductor.
1 Assignment
0 Petitions
Accused Products
Abstract
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.
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Citations
28 Claims
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1. A lead for use with an implantable medical device for implant within a patient, the lead comprising:
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an electrode for placement adjacent patient tissues; a conductor operative to route signals along the lead between the electrode and the implantable medical device, with a portion of the conductor formed as an insulated coil and configured to function as an inductive bandstop filtering element for filtering radio-frequency (RF) fields; and a conducting sheath surrounding at least a portion of the conductor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A bipolar lead for use with an implantable medical device for implant within a patient, the lead comprising:
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first and second electrodes for placement adjacent patient tissues; a first conductor operative to route signals along the lead between the first electrode and the implantable medical device, with a portion of the first conductor formed as an insulated coil to provide inductive bandstop filtering of radio-frequency (RF) fields; a second conductor operative to route signals along the lead between the second electrode and the implantable medical device, with a portion of the second conductor also formed as an insulated coil to provide inductive bandstop filtering of RF fields; and a conducting sheath surrounding at least portions of the first and second conductors.
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28. An implantable medical system for implant within a patient comprising:
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an implantable cardiac rhythm management device; and a lead for use with the implantable medical device wherein the lead includes an electrode for placement adjacent patient tissues, a conductor for routing signals along the lead between the electrode and the implantable medical device, with a portion of the conductor formed as an insulated coil and configured to function as an inductive bandstop filtering element for filtering radio-frequency (RF) fields, and a conducting sheath surrounding at least a portion of the conductor.
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Specification