Patent ID: 8343093

Claim:
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.