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Patient-side occlusion detection system for a medication infusion system

  • US 4,863,425 A
  • Filed: 12/04/1987
  • Issued: 09/05/1989
  • Est. Priority Date: 12/04/1987
  • Status: Expired due to Term
First Claim
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1. A patient-side occlusion detection system for use in a medication infusion system having a disposable cassette including a pump mounted onto a main pump unit, comprising:

  • means for providing an electrical patient-side pressure signal indicative of patient-side fluid pressure;

    a differentiator for taking the first difference of said patient-side pressure signal to produce a pressure change rate signal;

    a one-step ahead predictor having as inputs said patient-side pressure signal and said pressure change rate signal, said one-step ahead predictor having as an output a predicted future pressure signal;

    first means for monitoring said one-step ahead predictor whenever said pressure change rate signal equals or exceeds a first preselected value, said first monitoring means initiating an alarm when said predicted future pressure signal exceeds a second preselected value; and

    second means for monitoring said patient-side pressure signal whenever said pressure change rate signal is less than said first preselected value, said second monitoring means initiating an alarm when said patient-side pressure signal exceeds a third preselected value.

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