Patent ID: 7628773

Claim:
A product dispensing apparatus, comprising a disposable reservoir module and a reusable dosing and activating module detachably connected to said reservoir module, said disposable reservoir module comprising: a) a front casing section of said product dispensing apparatus, which comprises a reservoir for a product which can be delivered, a blocking means and a first connecting means; b) a piston which is accommodated in said reservoir such that it can be shifted in an advancing direction towards a reservoir outlet, in order to deliver product; c) and a piston rod which comprises a returning blocking means which is in blocking engagement with said blocking means, said blocking engagement preventing said piston rod from moving counter to said advancing direction, relative to said front casing section, wherein the piston rod is held by a mechanism holder, secured against rotating; said reusable dosing and activating module comprising: d) a rear casing section of the product dispensing apparatus, which comprises a second connecting means which together with said first connecting means forms the detachable connection between the reservoir module and the dosing and activating module; and e) a dosing and drive device, using which a dosing movement for selecting a product dosage and a delivery movement for delivering the product dosage can be performed relative to at least one of the casing sections; wherein f) the product dispensing apparatus further comprises a dosage setting member which is moved in the advancing direction by the dosing and drive device during said delivery movement and which engages with the piston rod such that it is moved jointly with the piston rod in the advancing direction and is moved relative to the piston rod counter to the advancing direction, wherein the reusable dosing and activating module is reusable with a series of new disposable reservoir modules.