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Reservoir plunger position monitoring and medical device incorporating same

  • US 8,808,269 B2
  • Filed: 08/21/2012
  • Issued: 08/19/2014
  • Est. Priority Date: 08/21/2012
  • Status: Active Grant
First Claim
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1. An infusion device, comprising:

  • a housing including a voided region to receive a reservoir, the voided region including a voided portion to receive a shaft portion including a shaft coupled to a plunger of the reservoir, the shaft portion comprising a detectable feature;

    a sensing arrangement proximate the voided portion to sense the detectable feature when the reservoir is inserted in the voided region;

    a motor having a rotor coupled to the shaft, the shaft being displaced to deliver fluid from the reservoir in response to rotation of the rotor;

    a motor position sensor to measure an amount of rotation of the rotor; and

    a control module coupled to the sensing arrangement and the motor position sensor to obtain a measured position of the shaft using the sensing arrangement, determine an expected position of the shaft based on the amount of rotation, and identify an anomalous condition based on a difference between the expected position and the measured position.

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