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The possibility of using RF fields to power biologically implanted transmitters used in biomedical experiments was investigated. This approach would be especially useful when animal subjects are strapped in chairs or confined in cages. A telemetry system using an external source of energy has the additional advantage of not being limited in operation by battery lifetime and can therefore operate for virtually infinite lengths of time. A description of a system based on this principle is given. Progress in the development of battery-driven transmitters is also reported, including an ingestible temperature telemetry system and a resistance-to-pulse frequency convertor for implantable temperature telemetry systems.

The progess made from April 1973 to June 1974 on a microelectronics bioinstrumentation system is reported and includes data for the following three individual projects: (1) a radio frequency powered implant telemetry system; (2) an ingestible temperature telemeter; and (3) development of pO2 and pH sensors. Proposed activities for continuation of the research for the period September 1, 1974 to August 31, 1975 are also discussed.

Design and performance of miniaturized portable heart rate and electrocardiographic monitoring system for prolonged space flights

Ring oscillator and strain gage transmitter development for multichannel biotelemetry system

Application of electronic technology to design and development of integrated circuit, telemetry system for biomedicine

Multichannel, physiologically implantable telemetering system for biological measurements

Operation and maintenance of multichannel, physiologically implantable telemetering systems for biological measurements

System design and fabrication methods for multiple channel, physiologically implantable, telemetering systems

Techniques for fabrication of multiple-channel physiologically implantable telemetry systems

Integrated-circuit multiplexed telemetry systems for biomedical applications