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Infusion pump system, an infusion pump unit and an infusion pump

  • US 7,232,423 B2
  • Filed: 01/21/2005
  • Issued: 06/19/2007
  • Est. Priority Date: 07/24/2002
  • Status: Expired due to Term
First Claim
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1. An infusion pump device, comprising:

  • a portable pump housing defining a space to receive insulin;

    a user interface coupled to the portable pump housing, the user interface comprising a display device that shows data to a user;

    a piston rod movably arranged in the housing to advance from a first position to a second position so as to dispense insulin from the pump housing when insulin is received in the pump housing;

    a gear that is rotatable in an activation direction to drive the piston rod from the first position to the second position;

    a ratchet body that engages the gear, the ratchet body being adjustable from a non-activating position to an activating position so as to incrementally rotate the gear in the activation direction;

    a pawl device that engages the gear to prevent rotation of the gear in a direction opposite the activation direction; and

    a spring bias device to urge the ratchet body from the non-activating position to the activating position so that the piston rod is advanced to the second position by mechanical force of the spring device.

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