Patent ID: 7905868

Claim:
A delivery device for delivering an infusion medium to a user, the device comprising: a disposable housing portion adapted to be secured to a user; a durable housing portion configured to be selectively engaged with and disengaged from the disposable housing portion to allow disposal of the disposable housing portion without disposing of the durable housing portion; a reservoir supported by the disposable housing portion when the durable housing portion is engaged with the disposable housing portion and when the durable housing portion is disengaged from the disposable housing portion, the reservoir having an interior for containing a fluidic medium and a plunger moveable within the interior of the reservoir along an axial direction of the reservoir, the plunger having a threaded channel having first and second open ends; a rotatable shaft disposed at least partially within the reservoir interior, along the axial direction of the reservoir, the rotatable shaft extending through the threaded channel and out of the first and second ends of the threaded channel of the plunger and having a threaded portion operatively engaged with the threaded channel of the plunger when the durable housing portion is engaged with the disposable housing portion and when the durable housing portion is disengaged from the disposable housing portion, wherein rotation of the rotatable shaft causes the plunger to move along the length of the threaded portion of the rotatable shaft to vary the interior volume of the reservoir, the rotatable shaft having a connection end located external to the reservoir; and a drive device supported by the durable housing portion, the drive device having a rotatable drive linkage member that operatively connects to the connection end of the rotatable shaft, to transfer rotary motion to the rotatable shaft to selectively rotate the rotatable shaft, when the disposable and durable housing portions are engaged and that disconnects from the connection end of the rotatable shaft when the disposable and durable housing portions are disengaged; wherein the rotatable shaft extends out of the first end of the threaded channel and at least partially into the reservoir interior that is for containing a fluidic medium.