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Coupling for an auto-injection device

  • US 7,758,548 B2
  • Filed: 12/08/2005
  • Issued: 07/20/2010
  • Est. Priority Date: 12/09/2004
  • Status: Active Grant
First Claim
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1. A power injection assembly, comprising:

  • a plunger rod having a rib;

    an injection spring;

    an inner housing having a first opening and an inner diameter, said injection spring surrounding said inner housing and said plunger rod being disposed in said inner diameter; and

    a coupling having a spring rest and a shoulder, said coupling being disposed in said inner diameter such that said spring rest extends through said first opening and receives said injection spring and such that said shoulder is compressed to a first position by said inner diameter, said shoulder being engaged with said rib in said first position.

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