Monitoring the seating status of a fluid reservoir in a fluid infusion device

  • US 8,197,444 B1
  • Filed: 12/22/2010
  • Issued: 06/12/2012
  • Est. Priority Date: 12/22/2010
  • Status: Active Grant
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First Claim
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1. A device for delivering fluid to a user, the device comprising:

  • a housing;

    a reservoir cavity within the housing to accommodate fluid reservoirs;

    a drive motor assembly in the housing to regulate delivery of fluid by actuating a piston of a fluid reservoir;

    a force sensor associated with the drive motor assembly to generate output levels in response to force imparted thereto; and

    an electronics module coupled to the force sensor to process the output levels to determine a seating status of the fluid reservoir in the reservoir cavity, wherein the electronics module;

    maintains a count that is indicative of the seating status;

    stores an adaptive reference force value that corresponds to a previously recorded measure of actuation force imparted to the force sensor during a previous fluid delivery pulse;

    obtains a current measure of actuation force imparted to the force sensor for a current fluid delivery pulse;

    changes the count when the current measure of actuation force is less than the difference between the adaptive reference force value and a threshold force value, resulting in an updated count; and

    generates a seating status alert when the updated count satisfies predetermined alert criteria.

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