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Hypodermic injection system

  • US 7,235,063 B2
  • Filed: 08/20/2002
  • Issued: 06/26/2007
  • Est. Priority Date: 08/21/2001
  • Status: Active Grant
First Claim
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1. An ampule for use with a hypodermic jet injector, said ampule comprising:

  • a body portion with a proximal end, a distal end and a longitudinal axis extending between said proximal end and said distal end, said body portion having a chamber having a relatively large opening in said proximal end and terminating before said distal end, and further having a relatively small orifice extending between the termination of said chamber and said distal end; and

    a slidable spool located in said chamber between said piston and said proximal end, and a spring device associated with said spool locking said spool in said chamber against movement towards said proximal end;

    said piston being slidable in said chamber from a position adjacent said orifice to said spool in response to the flow of injectate under pressure through said orifice; and

    said spool forcing said piston towards said orifice by the high-speed impact of a plunger against said spool to force injectate through said orifice to effect an injection.

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