Controlling plunger drives for fluid injections in animals

  • US 5,662,612 A
  • Filed: 06/26/1995
  • Issued: 09/02/1997
  • Est. Priority Date: 11/24/1993
  • Status: Expired due to Term
First Claim
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1. An injector of the type having a motor which advances and retracts a plunger located within a syringe toward and away from a nozzle located in the front of the syringe to inject fluid into or out of an animal subject, adapted for use with a syringe including an extender attached to said plunger, comprising:

  • a control circuit which causes said motor to move, said control circuit tracking the location of said motor while moving said motor, anda memory storing an offset value representative of the length of the extender which is attached to said plunger, whereinsaid control circuit computes a value indicative of the location of said plunger within said syringe by relating said stored offset value to the tracked location of said motor, and ceases motion of said plunger when said computed value indicates that said plunger is at an end of said syringe.

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