Implantable medical device with inductive antenna filter
First Claim
1. An implantable medical device comprising:
- an inductive antenna that receives signals via inductive coupling, wherein the inductive antenna is located within a conductive, non-magnetic housing of the implantable medical device;
a filter circuit that attenuates signals induced on the inductive antenna by varying magnetic fields generated from a source of interference and substantially passes signals induced on the inductive antenna by varying magnetic fields generated by an expected source; and
a telemetry module that processes the signals from the filter circuit.
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Accused Products
Abstract
This disclosure describes techniques for reducing, and possibly eliminating, adverse effects caused by signals induced on an inductive antenna of an implanted medical device by varying magnetic fields from a source of interference, such as the gradient magnetic fields applied during an MRI procedure. For example, the implantable medical device includes an inductive antenna that receives signals via inductive coupling, a filter circuit that attenuates signals induced on the inductive antenna by varying magnetic fields generated from a source of interference and substantially passes signals induced on the inductive antenna by varying magnetic fields generated by an expected source and a telemetry module that processes the signals from the filter circuit.
43 Citations
22 Claims
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1. An implantable medical device comprising:
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an inductive antenna that receives signals via inductive coupling, wherein the inductive antenna is located within a conductive, non-magnetic housing of the implantable medical device; a filter circuit that attenuates signals induced on the inductive antenna by varying magnetic fields generated from a source of interference and substantially passes signals induced on the inductive antenna by varying magnetic fields generated by an expected source; and a telemetry module that processes the signals from the filter circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An implantable medical device comprising:
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means for receiving signals via inductive coupling; means for filtering the received signals to attenuate signals induced on the inductive antenna by varying magnetic fields generated from a source of interference and substantially pass signals induced on the inductive antenna by varying magnetic fields generated by an expected source; means for processing the signals from the filter circuit, wherein the means for processing the signals and the means for filtering the received signals are separate components; and means for shielding the inductive antenna from radio frequency (RF) signals. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification