Controlling noise sources during telemetry
First Claim
Patent Images
1. A device comprising:
- telemetry means for transmitting and receiving radio frequency messages;
arrhythmia management means, comprising a capacitor in proximity to the telemetry means;
a switched charging circuit charging means for charging the capacitor with the switched charging circuit;
controller means for disabling the charging means when the telemetry means transmits a radio frequency message; and
clock means, coupled to the switched charging circuit, for activating and deactivating a switch to deliver charge to the capacitor, wherein the clock means activates and deactivates the switch once every switching period, wherein the duty cycle of the clock means comprises the ratio of the time of activation to the time of deactivation, and wherein the controller means disables the charging means by gradually reducing the duty cycle of the clock means.
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Abstract
The invention presents techniques for reducing the interference to telemetry from an implanted medical device caused by a source of controllable noise. In the context of an implanted system that includes a defibrillator system and a telemetry system, for example, the invention reduces the interference by suspending energy storage during telemetry. The invention further provides for suspending energy storage operation gradually rather than abruptly, by gradually reducing the duty cycle of a clock that controls the energy storage.
52 Citations
19 Claims
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1. A device comprising:
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telemetry means for transmitting and receiving radio frequency messages;
arrhythmia management means, comprising a capacitor in proximity to the telemetry means;
a switched charging circuit charging means for charging the capacitor with the switched charging circuit;
controller means for disabling the charging means when the telemetry means transmits a radio frequency message; and
clock means, coupled to the switched charging circuit, for activating and deactivating a switch to deliver charge to the capacitor, wherein the clock means activates and deactivates the switch once every switching period, wherein the duty cycle of the clock means comprises the ratio of the time of activation to the time of deactivation, and wherein the controller means disables the charging means by gradually reducing the duty cycle of the clock means. - View Dependent Claims (2)
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3. An implantable medical device for delivering therapy to a patient, comprising:
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a transceiver receiving input signals transmitted to the device and transmitting output signals from the device, the transceiver generating a first control signal in response to one of the receipt of the input signals and the transmission of the output signals;
a controller generating a second control signal having a substantially constant period and a variable duty cycle;
a charging circuit generating energy corresponding to delivery of the therapy by the device in response to the second control signal; and
an energy storage device storing the energy generated by the charging circuit, wherein the duty cycle is gradually varied by the controller in response to the generated first control signal from the transceiver to gradually disable the charging circuit prior to the transceiver initiating the receiving of input signals and the transmitting of output signals. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11)
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12. An implantable medical device for delivering therapy to a patient, comprising:
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a transceiver receiving input signals transmitted to the device and transmitting output signals from the device, the transceiver generating a first control signal in response to one of the receipt of the input signals and the transmission of the output signals;
a controller generating a second control signal having a substantially constant period and a variable duty cycle;
a charging circuit generating energy corresponding to delivery of the therapy by the device in response to the second control signal; and
an energy storage device storing the energy generated by the charging circuit, wherein the duty cycle is varied by the controller by a predetermined amount at each period corresponding to the second control signal in response to the generated first control signal from the transceiver to gradually disable the charging circuit prior to the transceiver initiating the receiving of input signals and the transmission of output signals. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification