Patent ID: 8961462
Filing Date: 2015-02-24
Classification: A61M

Abstract:
1. A portable infusion pump device for dispensing insulin to a user, comprising: a portable pump housing defining a space to receive insulin; a user interface positioned on the portable pump housing, the user interface comprising a display device for showing data related to insulin treatment; a piston rod defining an exterior thread pattern and linearly movable in an axial direction in the portable pump housing to advance from a first position to a second position so as to dispense insulin from the portable pump housing when insulin is received in the portable pump housing; a ratchet mechanism to urge the piston rod from the first position to the second position; a gear that is rotatable in an activation direction to drive the piston rod from the first position to the second position, wherein the ratchet mechanism comprises 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, and wherein the ratchet body maintains physical contact with the gear when moving between the non-activating position and the activating position; and a spring device that provides a drive force to the ratchet mechanism to advance the piston rod to the second position and thereby dispense insulin from the portable pump housing by mechanical power of the spring device when insulin is received in the portable pump housing.