Communication and charging circuitry for a single-coil implantable medical device
First Claim
1. Circuitry for an implantable medical device, comprising:
- a resonant circuit comprising a coil and configured to produce an AC voltage;
a rectifier configured to receive the AC voltage at a rectifier input and to produce a DC voltage at a rectifier output;
a first capacitance; and
a first switch controllable to couple or decouple the first capacitance to or from the rectifier output to control a resonant frequency of the resonant circuit.
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Accused Products
Abstract
Communication and charging circuitry for an implantable medical device is described having a single coil for receiving charging energy and for data telemetry. The circuitry removes from the AC side of the circuit a tuning capacitor and switch traditionally used to tune the tank circuitry to different frequencies for telemetry and charging. As such, the tank circuitry is simplified and contains no switchable components. A switch is serially connected to the storage capacitor on the DC side of the circuit. During telemetry, the switch is opened, thus disconnecting the storage capacitor from the tank circuit, and alleviating concerns that this capacitor will couple to the tank circuit and interfere with telemetry operations. During charging, the switch is closed, which allows the storage capacitor to couple to the tank circuitry through the rectifier during some portions of the tank circuitry'"'"'s resonance.
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Citations
44 Claims
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1. Circuitry for an implantable medical device, comprising:
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a resonant circuit comprising a coil and configured to produce an AC voltage; a rectifier configured to receive the AC voltage at a rectifier input and to produce a DC voltage at a rectifier output; a first capacitance; and a first switch controllable to couple or decouple the first capacitance to or from the rectifier output to control a resonant frequency of the resonant circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. Circuitry for an implantable medical device, comprising:
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a resonant circuit comprising a coil and configured to produce an AC voltage; a rectifier configured to receive the AC voltage at a rectifier input and to produce a DC voltage at a rectifier output; and tuning circuitry coupled to the rectifier output, wherein the tuning circuitry is controllable to control a resonant frequency of the resonant circuit, wherein the tuning circuitry controls the resonant frequency of the resonant circuit to a first frequency in a first mode of operation, and to a second frequency in a second mode of operation. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
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Specification