Variable volume, shape memory actuated insulin dispensing pump

  • US 8,029,245 B2
  • Filed: 12/29/2008
  • Issued: 10/04/2011
  • Est. Priority Date: 10/09/2002
  • Status: Active Grant
First Claim
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1. A method for dispensing a liquid from a pump, comprising:

  • providing a piston connected to a shape memory element;

    providing a potential to the shape memory element in order to change the length of the element;

    monitoring the position of the piston;

    adjusting the potential applied to the shape memory element to move the piston and intake liquid, based upon the monitored position;

    adjusting the potential applied to the shape memory element to move the piston and dispense liquid, based upon the monitored position;

    measuring a first time period, wherein the first time period is the time it takes for the piston to complete an intake stroke;

    comparing the first time period to a predetermined time period; and

    determining that the pump is not primed when the first time period is below the predetermined time period by a threshold amount of time.

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