Patent ID: 8585657
Filing Date: 2013-11-19
Classification: A61M

Abstract:
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 relative to the drive wheel 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 remains in a generally fixed axial position relative to the pump housing during forward advancement of the piston rod relative to the drive wheel.