Telemetry system for a medical device

Details Telemetry system for a medical device Telemetry system for a medical device

A - Human Necessities

61

B

326/13.3

A61B 5/02 (2006.01)

Patent

CA 1187140

ABSTRACT Conventional digital modems have not been applicable to pacemaker telemetry systems since their use would require the periodic conversion of analog data to a numerical value prior to transmission. In contrast, the pulse interval telemetry system of the present invention is capable of transmitting analog data without conversion to a numerical value, and is capable of sequen- tially transmitting both digital and analog data. This data is individually and serially transmitted in either an analog or digital format to a remote receiver. The apparatus of this invention includes a resonant tank circuit for producing a radio frequency carrier signal. This tank circuit is operative at periodic intervals determined by the output frequency or period of a variable frequency oscillator (VFO). Thus, the VFO output modulates the time interval between consecutive pulses of the carrier signal. Sources of digital and analog information are interfaced to the VFO to vary the VFO output period. In the digital mode the VFO output is varied to a first preselected period to encode a logic one, and to a second preselected period to encode a logic zero. In the analog mode the VFO output is continuously variable over a limited range about a nominal time period to encode the analog data. An additional feature of the invention is the use of the VFO output to synchronize the translation of digital data from a parallel format in memory to a serial format suitable for telemetry transmission.

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