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Needle-less injector and method of fluid delivery

  • US 8,529,500 B2
  • Filed: 06/16/2011
  • Issued: 09/10/2013
  • Est. Priority Date: 05/03/2005
  • Status: Active Grant
First Claim
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1. A needle-less injector device comprising:

  • an inner housing;

    a trigger;

    an outer housing supporting the inner housing and trigger such that the inner housing is axially movable within the outer housing between a safe position where actuation of the trigger will not cause an injection and a firing position where actuation of the trigger will cause an injection; and

    a tensioning spring between the inner housing and the outer housing, the tensioning spring biasing the inner housing towards the safe position;

    wherein the tensioning spring comprises an adjustable tensioning spring.

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