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Occlusion detection system for an infusion pump

  • US 5,935,106 A
  • Filed: 11/26/1997
  • Issued: 08/10/1999
  • Est. Priority Date: 07/27/1994
  • Status: Expired due to Term
First Claim
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1. A method for determining the fluid pressure in a fluid tube of an infusion system where the fluid tube is partially compressed by a pressure sensor and the fluid tube exerts a tube force on the sensor that changes over time, the infusion system having a first and subsequent infusion cycles, comprising the steps of:

  • a) determining an estimated tube force on the sensor due to the stiffness of the tube;

    b) acquiring a force measurement prior to an infusion cycle;

    c) determining if the force measurement prior to an infusion cycle is less than the estimated tube force including updating the estimated tube force, if the force measurement is less than the estimated tube force, as a function of the difference between the estimated tube force and the force measurement; and

    d) calculating and storing the fluid pressure as a function of at least the force measurement less the estimated tube force.

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