Surgery – Truss – Perineal
Patent
1975-10-01
1976-08-17
Kamm, William E.
Surgery
Truss
Perineal
3 17, 128 205V, 128 21A, 324 61R, 331117R, A61F 124
Patent
active
039748251
ABSTRACT:
An electrical capacitance measurement system for monitoring at a distance the instantaneous blood volume within the body of an air or gas activated blood pump. Electrical capacitance changes within the pneumatic blood pump frequency modulates an oscillator, and the extraneous capacitances encountered are incorporated as electrical, integral components in oscillator operation. An inductor, placed within or in close proximity to the pump, and the relatively small electrical capacitance within the pump form an oscillator tank which primarily determines oscillator frequency. By thus creating a tank at the site of measurement, active and other oscillator components can be placed at a distance from the pump, and undesirable cable capacitances can conveniently be incorporated as participating feedback capacitors. Preferably, an electrically protective shield is attached to the outside of the pump which electrically shields the pump and which provides a capacitance larger than the sensing capacitance to provide a linear relationship between the sensing capacitance and the sensor output. The Clapp oscillator principle has been employed as it permits the separate location of the sensing, frequency determining tank, and, at the same time it provides high sensitivity for capacitance measurement and adequate long-term stability. The present system is applicable to various types of gas activated blood pumps employed outside or inside the body of humans or animals.
REFERENCES:
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patent: 3491377 (1970-01-01), Bolie
patent: 3531257 (1970-09-01), Harvey et al.
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patent: 3718044 (1973-02-01), Joyce, Jr. et al.
patent: 3720199 (1973-03-01), Rishton
patent: 3783453 (1974-01-01), Bolie
Baylor College of Medicine
Kamm William E.
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