Induction powered biological radiosonde

Details Induction powered biological radiosonde Induction powered biological radiosonde

1977-05-12

1980-02-05

Michell, Robert W.

Surgery

Truss

Pad

128903, 73724, A61B 500

Patent

active

041867491

ABSTRACT:
An induction powered implanted monitor for epidurally measuring intracranial pressure and telemetering the pressure information to a remote readout. The monitor utilizes an L-C oscillator in which the C comprises a variable capacitance transducer, one electrode of which is a small stiff pressure responsive diaphragm. The oscillator is isolated from a transmitting tank circuit by a buffer circuit and all electric components in the implanted unit except an input and an output coil are shielded by a metal housing.

REFERENCES:
patent: 3422324 (1969-01-01), Webb
patent: 3619742 (1971-11-01), Rud
patent: 3757770 (1973-09-01), Brayshaw et al.
patent: 3968694 (1976-07-01), Clark
patent: 4026276 (1976-04-01), Chubbuck
patent: 4062351 (1977-12-01), Taylor et al.
Pauley, J. et al. "An Implantable Multi-Channel Biotelemetry System", EEG and Clin. Neur. V 37 #2, Aug. 1974, pp. 153-160.
Collins, Carter C. "Miniature Passive Pressure Transensor for Implanting in the Eye", IEEE Transactions on Bio-Med Engineering vol. BME-14 #2 Apr. 1967.
Simard, J. M. et al. "Development of Telemetric Techniques for Use in Studies of the Electrical Activity of the Brain", ISA Transactions vol. 15 #3 pp. 246-252 1976.

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