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Threaded nut syringe plunger for use with a medication infusion pump

  • US 5,954,697 A
  • Filed: 03/02/1998
  • Issued: 09/21/1999
  • Est. Priority Date: 03/02/1998
  • Status: Expired due to Term
First Claim
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1. In an infusion pump system including an infusion pump having a pump housing defining a syringe compartment for receiving and supporting a syringe, and an access door movable between open and closed positions, said syringe having a syringe barrel and a plunger received therein, said pump including a lead screw and means for controllably driving said lead screw, the improvement comprising:

  • an open-sided and internally threaded half nut carried by said plunger for threadably engaging said lead screw whereby rotation of said lead screw advances said plunger relative to said barrel to deliver medication from said syringe;

    said half nut further including detent means for snap-fit engagement with said lead screw to retain said half nut in threaded engagement with said lead screw.

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