Pulsed drop detector for intravenous systems

Details Pulsed drop detector for intravenous systems Pulsed drop detector for intravenous systems

1990-08-29

1993-12-07

Rosenbaum, C. Fred

Surgery

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

Treating material introduced into or removed from body...

128DIG13, 604253, A61M 500

Patent

active

052679780

ABSTRACT:
A drop detector for intravenous systems in which an infrared emitter is pulsed at 10 kHz. The pulsed radiation passes through a drip chamber and then to a detector. The detector circuit determines the amplitude modulation of the 10 kHz. carrier frequency. This provides an indication of when the drop falling through the drip chamber has interrupted the light beam. An automatic gain control circuit maintains the output of the detector, on a long time constant basis, at a constant level to eliminate the vagaries of drip chambers with different optical characteristics and the like. When the AGC circuit lacks the ability to maintain the output of the detector circuitry at a constant level, a fault detector provides an alarm to indicate that the circuitry has exceeded its operational range.

REFERENCES:
patent: 3714441 (1973-01-01), Kreda
patent: 3762221 (1973-10-01), Coulthard
patent: 3845400 (1974-10-01), Yee
patent: 4404860 (1983-09-01), Wood et al.
patent: 4498901 (1985-02-01), Finch

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