The mixed material may be directly injected by application of a pressure to the opposite side of the piston or to a separate injector piston.

In particular the present application relates to a device comprising motor arranged to move an injector piston and/or a reservoir piston so as to transfer a medicament in the medicament container to the injector chamber.

The sealing elements (5) are placed stacked on the head (6) of the injector piston (2) and are made of a graphite base non-metallic material that yields under compression.

Each injection sleeve (26) and the associated shot plunger (36) are vertically movable between a lowered position, and a raised position in contact with a bottom die member (18) to close a mold.