Drop detection method and apparatus

Details Drop detection method and apparatus Drop detection method and apparatus

1991-04-01

1993-10-26

Rosenbaum, C. Fred

Surgery

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

Treating material introduced into or removed from body...

604251, 604 67, 128DIG13, A61M 500

Patent

active

052561550

ABSTRACT:
A drop detector circuit and method are provided for a drop detector of the type including a drop chamber and an electro-optical sensor. A photodiode detects drops passing through its optical sensing path, and a capacitor is connected between the photodiode and an amplifier to block the DC component of the diode signal. After amplification, the signal is passed through a low pass filter to further block signals caused by undesirable factors. The cutoff frequency of the low pass filter is controlled by a microprocessor that controls the pump that pumps liquid from the drop chamber.

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patent: 4680462 (1987-07-01), Kamen
patent: 4718896 (1988-01-01), Arndt et al.
patent: 4720636 (1988-01-01), Benner, Jr.
patent: 4786800 (1988-11-01), Kamen
patent: 5012496 (1991-04-01), Weinreb et al.

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