Implantable medical devices and systems having inductive telemetry and recharge on a single coil
First Claim
1. An external recharge device, comprising:
- a tank circuit tuned to a recharge frequency of recharge energy;
a receiver with at least one input electrically connected to a node of the tank circuit, the receiver being configured to receive from the tank circuit incoming telemetry signals at a telemetry frequency;
a driver circuit electrically connected to a node of the tank circuit; and
a controller in electrical communication with the driver circuit, the controller causing the driver circuit to drive the tank circuit at the recharge frequency when sending recharge energy and to drive the tank circuit at a telemetry frequency when sending outbound telemetry signals.
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Accused Products
Abstract
Implantable devices and related systems utilize a single coil for both inductive telemetry at one telemetry signal frequency and recharge at another recharge energy frequency. The coil is included in a tank circuit that may have a variable reactance. During telemetry, particularly outside of a recharge period, the reactance may be set so that the tank circuit is tuned to the telemetry frequency. During recharge, the reactance is set so that the tank circuit is tuned to the recharge frequency. Furthermore, the tank circuit may have a Q that is sufficiently small that the tank circuit receives telemetry frequency signals that can be decoded by a receiver while the tank is tuned to the recharge frequency so that telemetry for recharge status purposes may be done during the recharge period without changing the tuning of the tank circuit.
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Citations
20 Claims
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1. An external recharge device, comprising:
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a tank circuit tuned to a recharge frequency of recharge energy; a receiver with at least one input electrically connected to a node of the tank circuit, the receiver being configured to receive from the tank circuit incoming telemetry signals at a telemetry frequency; a driver circuit electrically connected to a node of the tank circuit; and a controller in electrical communication with the driver circuit, the controller causing the driver circuit to drive the tank circuit at the recharge frequency when sending recharge energy and to drive the tank circuit at a telemetry frequency when sending outbound telemetry signals. - View Dependent Claims (2, 3, 4, 5)
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6. A medical system, comprising:
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an external recharge device that transmits recharge energy at a recharge frequency from a tank circuit tuned to the recharge frequency and that exchanges telemetry signals at a telemetry frequency that is different than the recharge frequency through the tank circuit tuned to the recharge frequency; and an implantable medical device that receives recharge energy at the recharge frequency from a tank circuit tuned to the recharge frequency and that exchanges telemetry signals at the telemetry frequency through the tank circuit tuned to the recharge frequency. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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14. A method, comprising:
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transmitting by an external device recharge energy at a recharge frequency from a tank circuit tuned to the recharge frequency and that exchanges telemetry signals at a telemetry frequency that is different than the recharge frequency through the tank circuit tuned to the recharge frequency; and receiving by an implantable medical device recharge energy at the recharge frequency from a tank circuit of the implantable medical device that is tuned to the recharge frequency and that exchanges telemetry signals at the telemetry frequency through the tank circuit tuned to the recharge frequency. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification