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Ambulatory infusion devices and methods with blockage detection

  • US 7,867,192 B2
  • Filed: 02/29/2008
  • Issued: 01/11/2011
  • Est. Priority Date: 02/29/2008
  • Status: Active Grant
First Claim
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1. A method of operating an infusion device including a fluid transfer device and a catheter, the method comprising the steps of:

  • transferring fluid to the catheter with the fluid transfer device a plurality of times during a measurement window;

    sensing catheter pressure a plurality of times during the measurement window;

    storing a plurality of sensed pressures in a queue in the order that the pressures were sensed;

    computing the pressure differences between time adjacent pairs of sensed pressures; and

    determining whether an increase in sensed pressure during the measurement window corresponds to an increase in sensed pressure that would result from a catheter blockage.

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