IMPLANTABLE MEDICAL DEVICE LEAD INCORPORATING INSULATED COILS FORMED AS INDUCTIVE BANDSTOP FILTERS 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; and
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 that is capacitively coupled to other portions of the lead to provide inductive-capacitive bandstop filtering of radio-frequency (RF) signals.
1 Assignment
0 Petitions
Accused Products
Abstract
To provide radio-frequency (RF) bandstop filtering within an implantable lead, such as a pacemaker lead, one or more segments of the tip and ring conductors of the lead are formed as insulated coils to function as inductive band stop filters. By forming segments of the conductors into insulated coils, a separate set of discrete or distributed inductors is not required, yet RF filtering is achieved to, e.g., reduce lead heating during magnetic resonance imaging (MRI) procedures. To enhance the degree of bandstop filtering at the RF signal frequencies of MRIs, additional capacitive elements are added. In one example, the ring electrode of the lead is configured to provide capacitive shunting to the tip conductor. In another example, a capacitive transition is provided between the outer insulated coil and proximal portions of the ring conductor. In still other examples, conducting polymers are provided to enhance capacitive shunting. The insulated coils may be spaced at ¼ wavelength locations.
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Citations
32 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; and 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 that is capacitively coupled to other portions of the lead to provide inductive-capacitive bandstop filtering of radio-frequency (RF) signals. - 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, 27, 28, 29, 30)
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31. 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; a second conductor operative to route signals along the lead between the second electrode and the implantable medical device; wherein portions of the tip and ring conductors are formed as insulated coils that are capacitively coupled to other portions of the lead to provide inductive-capacitive bandstop filtering of radio-frequency (RF) signals.
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32. 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 and 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 that is capacitively coupled to other portions of the lead to provide inductive-capacitive bandstop filtering of radio-frequency (RF) signals.
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Specification