Miniature ingestible telemeter devices to measure deep-body temp

Details Miniature ingestible telemeter devices to measure deep-body temp Miniature ingestible telemeter devices to measure deep-body temp

1972-10-27

1976-07-27

Kamm, William E.

Surgery

Truss

Perineal

128 2H, 128 21A, A61B 507

Patent

active

039713628

ABSTRACT:
A miniature, ingestible and encapsulated telemeter device for transmitting information relating to deep-body temperature of a subject comprising a battery source of power, and a free running multivibrator circuit having fixed biasing means connected to oscillator having a predetermind resonant frequency. A thermistor having a negative temperature coefficient of resistance is connected to the battery and the fixed biasing means and is operative to vary the output frequency of the multivibrator circuit in proportion to the temperature of the thermistor, the oscillator being pulsed into alernate states of conduction and non-conduction at the output frequency of the multivibrator to produce an output consisting of bursts of energy at the predetermined resonant frequency, preferably in the range 88 - 108 MHz. The time interval between successive bursts is proportionate to the deep-body temperature of the subject, and the thermistor having a very high resistance below a predetermind low temperature to cause inactivation of the multivibrator circuit and thereby only insignificant battery drain during refrigerated storage. A radiating inductor is connected to the output of the oscillator to transmit the bursts to a receiver.

REFERENCES:
patent: 3218638 (1965-11-01), Honig
patent: 3274994 (1966-09-01), Sturm
patent: 3453546 (1969-07-01), Fryer
patent: 3465103 (1969-09-01), Lynch
patent: 3719183 (1973-03-01), Schwartz

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