Fluid presence indicator for rotatable syringe

Details Fluid presence indicator for rotatable syringe Fluid presence indicator for rotatable syringe

1992-11-27

1993-10-19

Weiss, John G.

Surgery

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

Treating material introduced into or removed from body...

604187, 604232, A61M 518

Patent

active

052541010

ABSTRACT:
A means for detecting the presence of a transparent liquid in the barrel of a transparent angiography syringe comprising a plurality of indicator patterns positioned on the exterior of the barrel, the indicator patterns arranged in a helical array circumscribing the barrel of the syringe. When the syringe is empty, each indicator pattern is seen as having a first elliptical configuration; however, when the fluid is present in the barrel, the indicator pattern appears to have a second circular configuration, and the difference in apparent configuration is indicative of the presence of the liquid. The indicator patterns are arranged in a non-overlapping array, to permit non-obstructed viewing of the patterns, as well as ready comparison of distorted and non-distorted patterns.

REFERENCES:
patent: 3470867 (1969-10-01), Goldsmith
patent: 3941129 (1976-03-01), Pleznac
patent: 4018223 (1977-04-01), Ethington
patent: 4178071 (1979-12-01), Asbell
patent: 4594073 (1986-06-01), Stine
patent: 4743234 (1988-05-01), Leopoldi et al.

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