Fluid delivery device with autocalibration

  • US 8,343,093 B2
  • Filed: 05/28/2010
  • Issued: 01/01/2013
  • Est. Priority Date: 10/09/2002
  • Status: Active Grant
First Claim
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1. A method, comprising:

  • initiating pumping of at least one dose using, at least in part, a shape memory element, wherein the shape memory element is operatively coupled to a piston and is configured to move the piston between a plurality of positions within a first portion of the pumping mechanism when pumping the at least one dose;

    measuring the at least one dose by monitoring the time it takes the at least one dose to pass from a first sensor to a second sensor, wherein measuring the at least one dose includes determining a flow characteristic of the at least one dose;

    comparing the measured at least one dose to an expected value of the at least one dose;

    calculating a ratio based on the comparing the measured at least one dose to the expected value of the at least one dose;

    applying the calculated ratio to at least one subsequent dose when delivering the at least one subsequent dose; and

    adjusting a flow rate of the at least one subsequent dose when delivering the subsequent dose based at least in part on the determined flow characteristic.

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