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Infusion device having gear assembly initialization

  • US 9,308,321 B2
  • Filed: 02/18/2013
  • Issued: 04/12/2016
  • Est. Priority Date: 02/18/2013
  • Status: Active Grant
First Claim
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1. An infusion device comprising:

  • a housing to receive a shaft coupled to a plunger disposed in a reservoir;

    a gear assembly including a first gear to engage the shaft and a worm gear coupled to the first gear, the first gear having rotational freedom in a direction opposite a delivery direction, the worm gear exhibiting axial displacement in a first direction in response to rotation of the first gear in the direction opposite the delivery direction;

    a force sensor aligned with an axle of the worm gear;

    a motor having a rotor coupled to the gear assembly; and

    a control module coupled to the motor to operate the motor to displace the axle of the worm gear in a second direction opposite the first direction and away from the force sensor in response to the reset condition.

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