Fluid presence indicator for rotatable syringe
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United States of America Patent
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Oct 19, 1993
Grant Date -
N/A
app pub date -
Nov 27, 1992
filing date -
Nov 27, 1992
priority date (Note) -
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status (Latency Note)
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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.
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