Syringe content indicating device
First Claim
1. In an angiographic syringe having a transparent, hollow cylindrical barrel for receiving a transparent liquid, and a plunger axially reciprocable within the barrel for discharging the liquid therefrom, the improvement comprising indicating means carried by said barrel to indicate the presence of a transparent liquid within said barrel, said indicating means including a plurality of discrete, opaque patterns of predetermined shape substantially axially disposed along 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.
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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 at least one indicator pattern positioned on the exterior of the barrel, the indicator pattern being a discrete, opaque pattern. When the syringe is empty, the 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.
95 Citations
8 Claims
- 1. In an angiographic syringe having a transparent, hollow cylindrical barrel for receiving a transparent liquid, and a plunger axially reciprocable within the barrel for discharging the liquid therefrom, the improvement comprising indicating means carried by said barrel to indicate the presence of a transparent liquid within said barrel, said indicating means including a plurality of discrete, opaque patterns of predetermined shape substantially axially disposed along 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.
Specification