Patent ID: 9539388
Date: 2017-01-10
CPC Classifications: A61M

Claim:
1. A method of operating an infusion pump device, comprising: engaging a cap device with a pump housing of an infusion pump device so that the cap device covers an exterior opening of the pump housing and retains a medicine cartridge in a space defined in an interior of the pump housing, wherein the pump housing contains a piston rod that is movable toward an output end of the medicine cartridge, a forward end of the piston rod comprising a plunger engagement device including a plurality of substantially rigid pins and an adhesive layer; adjusting the medicine cartridge from a disengaged position in which the plunger engagement device is unattached to a plunger of the medicine cartridge to an engaged position in which the plunger engagement device attaches the piston rod to the plunger via the plurality of substantially rigid pins penetrating longitudinally into the plunger and the adhesive layer engaging a rear face of the plunger.