Implantable medical devices and systems having inductive telemetry and recharge on a single coil
First Claim
1. An implantable medical 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 telemetry signals at a telemetry frequency that is different than the recharge frequency while the tank circuit is tuned to the recharge frequency;
a controller that is coupled to the tank circuit that tunes the tank circuit to the telemetry frequency and the recharge frequency and that is coupled to the receiver, wherein in response to the controller receiving a recharge instruction obtained from telemetry signals received through the receiver, the controller tunes the tank circuit to the recharge frequency;
a rechargeable power source;
a rectifier that is electrically connected between the rechargeable power source and the tank circuit and that is configured to receive the recharge energy at the recharge frequency; and
medical circuitry electrically connected to the rechargeable power source.
1 Assignment
0 Petitions
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
22 Claims
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1. An implantable medical 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 telemetry signals at a telemetry frequency that is different than the recharge frequency while the tank circuit is tuned to the recharge frequency; a controller that is coupled to the tank circuit that tunes the tank circuit to the telemetry frequency and the recharge frequency and that is coupled to the receiver, wherein in response to the controller receiving a recharge instruction obtained from telemetry signals received through the receiver, the controller tunes the tank circuit to the recharge frequency; a rechargeable power source; a rectifier that is electrically connected between the rechargeable power source and the tank circuit and that is configured to receive the recharge energy at the recharge frequency; and medical circuitry electrically connected to the rechargeable power source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An implantable medical device, comprising:
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a tank circuit tuned to a recharge frequency of recharge energy; a driver circuit electrically connected to a node of the tank circuit, the driver circuit being configured to produce telemetry signals at a telemetry frequency that is different than the recharge frequency while the tank circuit is tuned to the recharge frequency; a controller that is coupled to the tank circuit that tunes the tank circuit to the telemetry frequency and the recharge frequency and that is coupled to the driver circuit, wherein in response to the controller receiving a recharge instruction obtained from telemetry signals, the controller tunes the tank circuit to the recharge frequency prior to the driver circuit producing telemetry signals at the telemetry frequency; a rechargeable power source; a rectifier that is electrically connected between the rechargeable power source and the tank circuit and is configured to receive the recharge energy at the recharge frequency; and medical circuitry electrically connected to the rechargeable power source. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method of interaction with an implantable medical device, comprising:
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at the implantable medical device, receiving telemetry signals that provide a recharge instruction and tuning a tank circuit to a recharge frequency in response to receiving the instruction; receiving recharge energy at the recharge frequency from the tank circuit of the implantable medical device that is tuned to the recharge frequency; and after receiving the telemetry signals that provide the recharge instruction, at the implantable medical device exchanging telemetry signals at a telemetry frequency that is different from the recharge frequency through the tank circuit of the implantable medical device that is tuned to the recharge frequency. - View Dependent Claims (18, 19, 20, 21)
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22. An implantable medical device, comprising:
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a tank circuit tuned to a recharge frequency of recharge energy; a receiver having a decoder to decode information from telemetry signals and with at least one input electrically connected to a node of the tank circuit, the receiver being configured to receive telemetry signals at a telemetry frequency that is different than the recharge frequency while the tank circuit is tuned to the recharge frequency and to decode the telemetry signals received while the tank circuit is tuned to the recharge frequency; a rechargeable power source; a rectifier that is electrically connected between the rechargeable power source and the tank circuit and that is configured to receive the recharge energy at the recharge frequency; and medical circuitry electrically connected to the rechargeable power source.
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Specification