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Fluid presence indicator for rotatable syringe

  • US 5,254,101 A
  • Filed: 11/27/1992
  • Issued: 10/19/1993
  • Est. Priority Date: 11/27/1992
  • Status: Expired due to Term
First Claim
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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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