Reservoir module comprising a piston rod

摘要

A product dispensing apparatus including a reservoir module, a dosing module and a dose setting member. The reservoir module includes a front casing section, a block, a first connector, a piston, and a piston rod moveable in a dispensing movement and against the dispensing movement, and including a return block engageable with the block, wherein engagement between the block and the return block prevents the piston rod from moving against the dispensing movement. The dosing module includes a rear casing section, including a second connector which is engageable with the first connector to form a detachable connection between the reservoir module and the dosing module, and a dosing and drive device. The dose setting member engages the piston rod such that it is moveable together with and in the same direction as the piston rod during the dispensing movement and is moveable relative to the piston rod against the dispensing movement.

主权项

1. A semi disposable product dispensing apparatus comprising a disposable reservoir module and a reusable dosing and activating module which are detachably connected to each other,
said disposable reservoir module comprising: a) a front casing section which comprises a reservoir for a product which can be delivered and a first connecting means; b) a piston accommodated in said reservoir such that it can be shifted in a dispensing direction towards a reservoir outlet to deliver the product, and c) a piston rod moveable in and against the dispensing direction; and said reusable dosing and activating module comprising: a) a rear casing section including a second connecting means engageable with the first connecting means to form a detachable connection; b) a dosing and drive element which is in a releasable engagement with the piston rod of the disposable reservoir module for providing and performing a dosing and delivery movement for delivery of the product; c) a motor for performing the delivery movement of the dosing and drive element, and d) a dose slaving means which is axially and rotationally fixed to the dosing and drive element wherein the piston rod comprises a connecting section which engages with the dose slaving means such that the piston rod and the dosing and drive element cannot be rotated relative to each other but can be moved relative to each other along the longitudinal axis in and counter to the advancing direction.