Passive telemetry system for implantable medical device
First Claim
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1. A telemetry system for enabling data transfer from an implantable medical device to an external device, comprising:
- an external device having an antenna and a transmitter for transmitting a radio-frequency carrier signal to an antenna of the implantable device;
an implantable device having an antenna and a tuning circuit for adjusting the impedance of the antenna in a time varying manner so as to phase modulate a carrier signal reflected therefrom in accordance with a digital data signal; and
, a receiver in the external device for receiving the phase modulated carrier signal reflected from the antenna of the implantable device and extracting the digital data signal therefrom.
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Abstract
A telemetry system enabling radio-frequency communications between an implantable medical device and an external device which requires minimal power consumption by the implantable device. The implantable device uses an antenna tuning circuit to vary the impedance of an antenna and phase modulate a carrier signal reflected back to the external device with digital message data.
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Citations
23 Claims
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1. A telemetry system for enabling data transfer from an implantable medical device to an external device, comprising:
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an external device having an antenna and a transmitter for transmitting a radio-frequency carrier signal to an antenna of the implantable device;
an implantable device having an antenna and a tuning circuit for adjusting the impedance of the antenna in a time varying manner so as to phase modulate a carrier signal reflected therefrom in accordance with a digital data signal; and
,a receiver in the external device for receiving the phase modulated carrier signal reflected from the antenna of the implantable device and extracting the digital data signal therefrom. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 18, 19, 20, 21, 22, 23)
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16. A method for enabling data transfer from an implantable medical device to an external device, comprising:
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transmitting a radio-frequency carrier signal from an antenna of the external device to an antenna of the implantable device;
adjusting the impedance of the implantable device antenna in a time varying manner so as to phase modulate a carrier signal reflected therefrom in accordance with a digital data signal; and
,receiving the phase modulated carrier signal reflected from the implantable device antenna at the external device and extracting the digital data signal therefrom.
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Specification