Patent ID: 8568361

Claim:
A portable therapeutic fluid dispensing device comprising: a reusable part comprising: a controller, a first portion of a driving mechanism, and a reusable part housing containing at least the controller and the first portion of the driving mechanism; and a disposable part comprising: a reservoir to retain therapeutic fluid, an outlet port to which the therapeutic fluid is dispensed, a fluid conduit providing fluid communication between the reservoir and the outlet port, a second portion of the driving mechanism comprising: a piston; a piston rod mechanically coupled to the piston at a first end of the piston rod, the piston rod being at least partially threaded; and an engagement member configured for threaded engagement with the piston rod, the engagement member being further configured to selectively enable controlled displacement of the piston rod within at least the reservoir via the threaded engagement, and substantially unrestricted displacement of the piston rod within at least the reservoir; and a disposable part housing containing at least the reservoir, the outlet port, the fluid conduit and the second portion of the driving mechanism; wherein the second portion of the driving mechanism is mechanically couplable to the first portion of the driving mechanism upon connection of the disposable part and the reusable part.