Fluid presence indicator for rotatable syringe
First Claim
1. In a rotatable angiographic syringe having a transparent, hollow, cylindrical barrel for receiving a transparent liquid, and a plunger axially reciprocal within the barrel for discharging the liquid therefrom, the improvement comprising indicator means carried by said barrel, said indicating means including a plurality of discrete patterns of predetermined shape substantially circumferentially disposed around said barrel, whereby the liquid alters the perceived configuration of said patterns when viewed through said barrel to provide a direct visual indication of the presence of a transparent liquid within said barrel notwithstanding the rotational orientation of said syringe.
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Accused Products
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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Citations
9 Claims
- 1. In a rotatable angiographic syringe having a transparent, hollow, cylindrical barrel for receiving a transparent liquid, and a plunger axially reciprocal within the barrel for discharging the liquid therefrom, the improvement comprising indicator means carried by said barrel, said indicating means including a plurality of discrete patterns of predetermined shape substantially circumferentially disposed around said barrel, whereby the liquid alters the perceived configuration of said patterns when viewed through said barrel to provide a direct visual indication of the presence of a transparent liquid within said barrel notwithstanding the rotational orientation of said syringe.
Specification