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Dispensing Fluid from an Infusion Pump System

  • US 20120330270A1
  • Filed: 06/21/2011
  • Published: 12/27/2012
  • Est. Priority Date: 06/21/2011
  • Status: Active Grant
First Claim
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1. An infusion pump device, comprising:

  • a pump housing that defines a space to receive a medicine;

    a drive system to dispense a medicine from the pump housing when the medicine is received in the space, the drive system comprising;

    an electrically powered actuator;

    a drive wheel that rotates in response to movement of the electrically powered actuator; and

    a piston rod that is engaged with the drive wheel, wherein the piston rod is advanced in a longitudinally forward direction toward the space to receive the medicine in response to rotation of the drive wheel,wherein the drive wheel is spring-biased in an axial direction that is generally opposite to the longitudinally forward direction so that the drive wheel is urged toward a selected axial position in the pump housing.

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