Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1987-05-28
1988-11-15
Coven, Edward M.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604 65, A61M 514
Patent
active
047846437
ABSTRACT:
First and second spaced apart optical emitter-receiving pairs are located along a liquid carrying conduit. A regulator circuit is coupled to each emitter-receiver pair to control the operation of that pair inside a maximum response range regardless of the transparency of the liquid. The regulator circuit is so arranged as to supply the emitter with a voltage which is a function of the difference between a voltage supplied by the receiver portion of an optical-receiver pair and a reference voltage. A differential circuit produces a differential signal representing the difference between the signals produced by the receiver portions of the optical emitter-receiver pairs and a comparator circuit is connected to the differential circuit in order to generate an alarm signal as a function of the differential signal. The detector is particularly useful as an air bubble detector in a transfusion or perfusion system, and can also provide a container-empty alarm in such systems.
REFERENCES:
patent: 4447191 (1984-05-01), Bilstad et al.
patent: 4525163 (1985-06-01), Slavih et al.
patent: 4673927 (1987-06-01), Cianciaricchia et al.
Siretchi Roman
Vignacq Pierre
Coven Edward M.
Societe Anonyme: M.M.S.
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