Variable volume, shape memory actuated insulin dispensing pump

  • US 7,922,458 B2
  • Filed: 12/29/2008
  • Issued: 04/12/2011
  • Est. Priority Date: 10/09/2002
  • Status: Active Grant
  • ×
    • Pin
First Claim
Patent Images

1. A pump comprising:

  • a chamber;

    an actuator comprising a shape memory alloy that moves a plunger within the chamber from a first position to a second position, wherein a liquid is drawn into the chamber when the plunger is moved from the first position to the second position and expelled from the chamber when the plunger is moved from the second position to the first position; and

    a control system that utilizes linear feedback to sense the position of the actuator and to automatically determine when the pump is primed based on a feedback response associated with the movement of the plunger, wherein the control system includes a microprocessor that is programmed to compare a time period associated with the feedback response to a predetermined time period and determine that the pump is not primed when the time period associated with the feedback response is below the predetermined time period by a threshold amount of time.

View all claims