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Disposable fluid injection module

DC
  • US 6,045,534 A
  • Filed: 10/27/1997
  • Issued: 04/04/2000
  • Est. Priority Date: 10/27/1997
  • Status: Expired due to Term
First Claim
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1. An apparatus for delivering a drug, comprising:

  • a) a housing disposed within said first chamber, said piston defining a second proximal end and defining a first chamber therein;

    b) a piston disposed within said first chamber, said piston defining a second chamber therein;

    c) a piston core movably disposed within said second chamber of said piston and defining a reservoir between said piston and said piston core;

    d) a pressure source proximate said proximal end and in communication with said first chamber;

    e) an injection device coupled to the piston core and in communication with said reservoir for delivery of a dose of a drug contained therein;

    f) an adjustment device coupled to the housing for adjusting the dose; and

    g) the piston core includes an externally threaded spindle attached on a distal end to an adjustment knob and threadedly engaged with an internally threaded ring, said ring engaged with said housing and providing a stop for said piston upon activation of said pressure source.

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