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Flow sensor for an infusion pump

  • US 5,462,525 A
  • Filed: 06/14/1994
  • Issued: 10/31/1995
  • Est. Priority Date: 06/14/1994
  • Status: Expired due to Term
First Claim
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1. A medication infusion pump, comprising:

  • a pump housing having a medication chamber formed therein for receiving a supply of a selected medication;

    pump means within said housing for delivering the medication from said medication chamber through a discharge conduit to a patient; and

    flow sensor means for monitoring flow of the medication through said discharge conduit, said flow sensor means including an inductor coil mounted externally about said discharge conduit, and a core pin of a magnetically attractable material mounted within said discharge conduit for displacement therein relative to said inductor coil in response to medication flow through said discharge conduit;

    said flow sensor means including means for normally retaining said core pin in a first position retracted from said inductor coil during nonflow of medication through said discharge conduit, said core pin responding to flow of medication through said discharge conduit for displacement from said first position to a second position disposed generally coaxially within said inductor coil;

    said core pin retaining means comprising means for magnetically retracting said core pin to said first position.

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