Passive telemetry system for implantable medical device
First Claim
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1. A telemetry system for enabling transfer of message data from an implantable medical device to an external device, comprising:
- an implantable medical device;
an external device;
a transmitter and a transmitter antenna incorporated as part of the external device for transmitting a radio-frequency carrier signal to the implantable device;
an implantable device antenna incorporated as part of the implantable device for reflecting the radio-frequency carrier signal;
a tuning circuit incorporated as part of the implantable device for adjusting the impedance of the implantable device antenna in a time varying manner so as to phase modulate the radio-frequency carrier signal reflected therefrom in accordance with the message data;
a receiver and a receiver antenna incorporated as part of the external device for receiving the phase modulated carrier signal reflected from the antenna of the implantable device and extracting the message data therefrom; and
, wherein the transmitter and receiver antennas are linearly polarizing antennas orthogonal to one another and the implantable device antenna is elliptically polarizing.
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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
24 Claims
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1. A telemetry system for enabling transfer of message data from an implantable medical device to an external device, comprising:
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an implantable medical device;
an external device;
a transmitter and a transmitter antenna incorporated as part of the external device for transmitting a radio-frequency carrier signal to the implantable device;
an implantable device antenna incorporated as part of the implantable device for reflecting the radio-frequency carrier signal;
a tuning circuit incorporated as part of the implantable device for adjusting the impedance of the implantable device antenna in a time varying manner so as to phase modulate the radio-frequency carrier signal reflected therefrom in accordance with the message data;
a receiver and a receiver antenna incorporated as part of the external device for receiving the phase modulated carrier signal reflected from the antenna of the implantable device and extracting the message data therefrom; and
,wherein the transmitter and receiver antennas are linearly polarizing antennas orthogonal to one another and the implantable device antenna is elliptically polarizing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. 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 a transmitter antenna of the external device to an antenna of the implantable device which reflects the radio-frequency carrier signal;
adjusting the impedance of the implantable device antenna in a time varying manner so as to phase modulate the radio-frequency 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 a receiver antenna of the external device and extracting the digital data signal therefrom;
wherein the transmitter and receiver antennas are linearly polarizing antennas orthogonal to one another and the implantable antenna is elliptically polarizing. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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Specification