Patent ID: 7232423
Filing Date: 2007-06-19
Classification: A61M

Abstract:
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.