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Methods and apparatuses for detecting occlusions in an ambulatory infusion pump

  • US 7,621,893 B2
  • Filed: 12/30/2005
  • Issued: 11/24/2009
  • Est. Priority Date: 10/29/1998
  • Status: Expired due to Term
First Claim
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1. A method of detecting an occlusion in an infusion pump having a drive mechanism that includes a motor and one or more drive train components coupled to a reservoir for infusing fluid from the reservoir into a body of a user, the method comprising:

  • (a) measuring a first value, said first value being equal to the magnitude of force applied to a drive train component;

    (b) measuring a second value, said second value being equal to the magnitude of a parameter associated with the motor or one of the drive train components, and said parameter being selected from the group consisting of drive current, drive voltage, motor drive time, motor coast time, delivery pulse energy, motor drive count, motor coast count, and delta encoder count;

    (c) adding said first value to said second value to obtain a first combined value; and

    (d) determining whether an occlusion has occurred by using the first combined value.

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