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Volume monitoring for implantable fluid delivery devices

  • US 9,687,603 B2
  • Filed: 04/16/2010
  • Issued: 06/27/2017
  • Est. Priority Date: 04/16/2010
  • Status: Active Grant
First Claim
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1. A therapeutic fluid delivery system comprising:

  • a reservoir configured to house a therapeutic fluid;

    a pressure sensor configured to measure a pressure of the reservoir; and

    a processor configured to determine at least one of a difference between an actual rate at which the therapeutic fluid is delivered from the reservoir and a rate at which the therapeutic fluid is expected to be delivered from the reservoir or a difference between an actual volume and an expected volume of therapeutic fluid in the reservoir based on changes in the pressure of the reservoir measured by the pressure sensor over time and detect an unexpected change in a volume of the therapeutic fluid in the reservoir when at least one of the difference between the actual rate at which the therapeutic fluid is delivered from the reservoir and the rate at which the therapeutic fluid is expected to be delivered from the reservoir is greater than a first threshold or the difference between the actual volume and the expected volume of therapeutic fluid in the reservoir is greater than a second threshold,wherein the first and second thresholds decrease as a time period over which the changes in the pressure of the reservoir are measured by the pressure sensor increases.

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