Ingestible size continuously transmitting temperature monitoring

Details Ingestible size continuously transmitting temperature monitoring Ingestible size continuously transmitting temperature monitoring

1988-08-26

1989-07-04

Cohen, Lee S.

Surgery

Truss

Pad

128736, 128903, A61B 507

Patent

active

048440760

ABSTRACT:
A temperature responsive transmitter is disclosed. The transmitter utilizes a unique circuit design that allows encapsulation in an ingestible size capsule. The inventive circuit design uses a one transistor inverting amplifier with a tank circuit forming the link between the transistor's collector and the battery. The tank circuit is tuned to provide a lagging capacitive load which causes the inverting amplifier to oscillate. The tank circuit contains a coil inductor that emits a near field magnetic communications field containing temperature information. The ingestible size temperature pill can be configured in a rechargeable embodiment. In this embodiment the pill uses the inductive coil in the tank circuit as the magnetic pickup to charge a rechargeable nickel cadmium battery.

REFERENCES:
patent: 3739279 (1973-06-01), Hollis
patent: 3971362 (1976-07-01), Pope et al.
patent: 4689621 (1987-08-01), Kleinberg
Crystal-Controlled, Surgically Implantable Temperature Telemetry Transmitter, J. L. Riley, Medical & Biological Eng. & Comp., May 1980, pp. 363-364.

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