Drop detection method and apparatus

Details Drop detection method and apparatus Drop detection method and apparatus

1992-11-02

1995-05-16

Yasko, John D.

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

A61M 500

Patent

active

054156416

ABSTRACT:
A drop detector circuit and method are provided for a drop detector of the type including a drop chamber and a light emitter and corresponding detector located on opposite sides of the drop chamber. The detector is saturated by light emitted from the light emitter to produce a saturated detector output signal. The detector circuit senses variations in the detector output signal caused by drops passing through the drop chamber between the emitter and detector that block light emitted by the emitter from reaching the detector. The detector circuit senses the slope of the variations in the detector output signal and produces a control signal when the slope exceeds a threshold value.

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patent: 4720636 (1988-01-01), Benner, Jr.
patent: 4786800 (1988-11-01), Kamen
patent: 5012496 (1991-04-01), Weinreb et al.
patent: 5045069 (1991-09-01), Imparato

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