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Injector administering subcutaneous injections without a needle and with a one-shot cap

  • US 5,256,142 A
  • Filed: 07/17/1992
  • Issued: 10/26/1993
  • Est. Priority Date: 08/06/1991
  • Status: Expired due to Fees
First Claim
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1. An injector for administering subcutaneous injections without a needle, comprising:

  • an injection head having an aperture passing therethrough;

    a chamber operably connected to said aperture, said chamber having a piston axially movable therein, said piston having a retracted position enabling charging of medicament into said chamber and an expulsion position whereby said medicament is expelled from said chamber through said aperture when said piston is thrusted axially from said retracted position to said expulsion position;

    means for charging medicament into said chamber;

    means for thrusting said piston from said retracted position to said expulsion position;

    a replaceable, one-shot cap removably installed on said injection head, said cap having a removable stopper capable of being at least partly broken away from said cap and a hole through said removable stopper and cooperating with said aperture through which said medicament can pass; and

    an axially movable striker positioned within said injection head and cooperating with said piston and having a retracted position between said piston and said removable stopper and a breakage position projecting from said injection head for at least partly breaking said removable stopper away from said cap when said piston is in said expulsion position.

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