Communication and charging circuitry for a single-coil implantable medical device
First Claim
1. Communication and charging circuitry for an implantable medical device, comprising:
- a resonant circuit comprising a coil and a resonant capacitor for producing an AC voltage;
a rectifier coupled to the resonant circuit for producing a DC voltage from the AC voltage;
a storage capacitor for receiving the DC voltage;
a first switch in series with the storage capacitor; and
control circuitry, wherein the control circuitry is configured to close the first switch during periods when the resonant circuit is wirelessly receiving energy, and wherein the control circuitry is configured to open the first switch during periods where the resonant circuit is performing data telemetry.
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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.
27 Citations
24 Claims
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1. Communication and charging circuitry for an implantable medical device, comprising:
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a resonant circuit comprising a coil and a resonant capacitor for producing an AC voltage; a rectifier coupled to the resonant circuit for producing a DC voltage from the AC voltage; a storage capacitor for receiving the DC voltage; a first switch in series with the storage capacitor; and control circuitry, wherein the control circuitry is configured to close the first switch during periods when the resonant circuit is wirelessly receiving energy, and wherein the control circuitry is configured to open the first switch during periods where the resonant circuit is performing data telemetry. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. Communication and charging circuitry for an implantable medical device, comprising:
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a resonant circuit comprising a coil and a resonant capacitor for producing an AC voltage; a rectifier coupled to the resonant circuit for producing a DC voltage from the AC voltage; and tuning circuitry comprising a storage capacitor and coupled to the output of the rectifier, wherein the tuning circuitry is controllable to control a resonant frequency of the resonant circuit. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification