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Syringe system providing retraction of needle cannula into disposable cartridge

  • US 5,501,670 A
  • Filed: 03/31/1995
  • Issued: 03/26/1996
  • Est. Priority Date: 03/31/1995
  • Status: Expired due to Fees
First Claim
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1. A needle retracting piston for use in a disposable medicant cartridge for a syringe, comprising:

  • an elastomeric piston body axially slidable within a tubular cartridge body; and

    a needle retraction unit mounted within said elastomeric piston body, said unit including a tensile strength member arranged for making engagement with a plunger hook to allow proximal retraction of said plunger body through said tubular cartridge body, and a needle receiving structure for interlocking, at the end of an injection stroke, with a proximal end of a needle cannula protruding into said cartridge body, whereby a used needle cannula can be retracted with said piston body into said cartridge.

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