Air emboli detection

Details Air emboli detection Air emboli detection

1978-11-24

1981-07-28

Michell, Robert W.

Surgery

Respiratory method or device

Ozone or ion generation

422 45, 210 94, A61M 514

Patent

active

042804957

ABSTRACT:
Air emboli detection method and apparatus for use in cardiopulmonary bypass surgery or the like comprising modular sensor, control and power units. The sensor unit is adapted to releasably clamp a blood flow tubing or conduit in a vertical orientation below a blood deaerator, and includes an LED infrared source and a phototransistor detector. The control unit applies pulsed power to the light source only at preselected periodic intervals, and monitors for an output from the detector only at times corresponding to the preselected intervals to achieve an enhanced signal-to-noise ratio. The power unit includes a solid state relay responsive to detection of emboli for removing power from a blood pump or the like.

REFERENCES:
patent: 3812482 (1974-05-01), Clark
patent: 3846772 (1974-11-01), Peberdy
patent: 3896803 (1975-07-01), Mason
patent: 3935876 (1976-02-01), Massie et al.
patent: 3989625 (1976-11-01), Mason
patent: 4038982 (1977-08-01), Burke et al.
patent: 4114144 (1978-09-01), Hyman
patent: 4124301 (1978-11-01), Pocock
patent: 4155362 (1979-05-01), Jess
patent: 4164937 (1979-08-01), Spencer
patent: 4166961 (1979-09-01), Dam et al.
patent: 4167331 (1979-09-01), Nielsen
patent: 4181610 (1980-01-01), Shintani et al.

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