Coating apparatus – Gas or vapor deposition – Work support
Patent
1983-09-20
1985-05-28
Coven, Edward M.
Coating apparatus
Gas or vapor deposition
Work support
73721, A61B 500
Patent
active
045194017
ABSTRACT:
An implantable intracranial pressure (ICP) telemetry transmitter. Data transmission is accomplished by means of a radio frequency (RF) link coupled to a silicon piezoresistive pressure transducer. Electrostatic bonding of this transducer onto a tubular glass support provides long-term stability, stress isolation and a hermetic package. Because of the large temperature coefficient of the electrostatically bonded pressure transducer (-6 to -9 mm Hg/.degree.C.), a temperature sensor is added to allow temperature compensation to be carried out. Pulse code modulation is employed to assure accurate data transmission. Use of low duty cycle pulse powering techniques lowers the power consumption of the telemeter. The complexity of the electronics is reduced by the use of a custom integrated circuit. Two lithium batteries can provide more than one month of continuous operation and an RF command receiver provides ON/Off control of the telemeter to extend the lifetime of the telemeter.
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Fleming, D., Bettice, J., Kocovsky, C., Zycer, I., Leung, A. and Ko, W. H., "A Totally Implantable Intra-Arterial Blood Pressure Monitor", Abstract from 32nd ACEMB--Denver Hilton Hotel, Denver, Colorado, p. 204 (Oct. 6-10, 1979).
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Ko Wen H.
Leung Albert M.
Case Western Reserve University
Coven Edward M.
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