Intravenous monitoring system utilizing a dynamic reference thre

Details Intravenous monitoring system utilizing a dynamic reference thre Intravenous monitoring system utilizing a dynamic reference thre

1982-07-30

1984-12-25

Howell, Kyle L.

Surgery

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

Treating material introduced into or removed from body...

128DIG13, 604 31, 604246, A61M 516

Patent

active

044901402

ABSTRACT:
An intravenous monitoring system in which dynamic reference threshold circuitry is used to provide output signals indicating the presence of liquid passing through the drip chamber of an intravenous feeding apparatus. A light sensor that detects the presence of liquid passing through the drip chamber generates a detecting signal that is amplified and processed by the dynamic reference threshold circuitry. The dynamic reference threshold circuitry comprises a comparator circuit, and a D.C. component reference circuit that provides the reference threshold to the comparator circuit. The amplified detecting signal is directed both to an input of the comparator circuit and the D.C. component reference circuit. The D.C. component reference circuit uses a diode to produce a voltage drop in the amplified detecting signal and an RC circuit to both store and emit a residual signal when there is a sudden drop in the amplified detecting signal. A resistor is connected in parallel with the diode to provide a leakage path around the diode and thereby form a proportional reference threshold. Whenever the reference threshold exceeds the amplified detecting signal the comparator circuit generates an output signal indicating liquid passing through the drip chamber. If streaming occurs in the drip chamber an extending output signal by the comparator circuit will indicate this.

REFERENCES:
patent: 4038981 (1977-08-01), LeFevre et al.
patent: 4312355 (1982-01-01), Funke
patent: 4314484 (1982-02-01), Bowman
patent: 4315220 (1982-02-01), Findeisen
patent: 4361785 (1982-11-01), Stapleton
patent: 4383252 (1983-05-01), Purcell et al.

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