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Syringe shield

  • US 5,024,660 A
  • Filed: 09/12/1989
  • Issued: 06/18/1991
  • Est. Priority Date: 03/17/1987
  • Status: Expired due to Term
First Claim
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1. A syringe comprising:

  • a barrel having an hypodermic needle mounted on one end thereof, a piston mounted for movement longitudinally within the barrel and connected to a handle that projects from the opposite end of said barrel;

    wherein said barrel is tubular and at least partially transparent in a portion that extends over the major part of its length;

    a tubular sleeve dimensioned to fit over the barrel, and guided to slide axially thereon between an extended position wherein it projects from said one end of the barrel beyond the tip of said needle and a retracted position wherein it coaxially surrounds said barrel and exposes said needle for use, said sleeve having a length that corresponds to that of said barrel and comprising a tubular wall that is at least partially transparent such that in said retracted position it affords unimpeded visibility of substantially the entire length of said transparent portion of said barrel;

    retaining means to secure said sleeve when in the retracted position, said retaining means being effective to prevent any inadvertent axial or rotational movement of said sleeve relative to said barrel; and

    locking means for securely and non-releasably locking the sleeve in said extended position, in which position the needle is fully covered to prevent injury to a user by the needle.

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