Monitoring apparatus for resonant circuit intracranial pressure

Details Monitoring apparatus for resonant circuit intracranial pressure Monitoring apparatus for resonant circuit intracranial pressure

1976-11-12

1978-09-19

Kamm, William E.

Surgery

Truss

Perineal

128 2P, 73 728, 324 57Q, A61B 502

Patent

active

041146069

ABSTRACT:
The invention relates to interrogation, detection, and monitoring apparatus useful for monitoring changes in the resonant frequency of a passive L-C circuit implanted in the cranium, the resonant frequency of the implanted circuit varying in a predetermined fashion with changes in the intracranial pressure. The present invention is disposed externally of the skull and provides apparatus for imposing electro-magnetic radiation on the implanted circuit, the frequency at which the radiation is absorbed being then detected and converted into an indication of intracranial pressure.

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patent: 4014319 (1977-03-01), Faure
patent: 4026276 (1977-05-01), Chubbuck
Sinfield, L. F. "Simple Inductance, Capacitance and Resonance Meter," Wireless World, Feb. 1955, pp. 95-96.
Collins, C. C. "Miniature Passive Pressure Transducer for Implanting in the Eye," IEEE Trans. on Biomed. Engr., vol. BME-14, No. 2, 4/67, pp. 74-83.
McAbel, W. E. "Probe Measurements," pp. 78-92, Tektronix, Inc., 1969.

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