Adaptor and Drug Delivery Device

A drug delivery device comprising:

• a reservoir for containing a product, said reservoir having a distally projecting end-piece defining a passageway for the transfer of the product from the reservoir;
• an adaptor having a collar engageable with said distally projecting end-piece, said collar having an elongated shape and comprising a proximal region and a distal region, said collar comprising an abutment surface on an inner wall of the collar, said abutment surface configured to directly contact a radial proximal face of an annular ridge on an outer wall of the distally projecting end-piece of said reservoir when said collar is urged in a distal direction to engage with said distally projecting end-piece, wherein said abutment surface is configured to limit translational movement of said collar with respect to said distally projecting end-piece once said collar is engaged with the distally projecting end-piece;
• at least one adaptor anti-rotation member configured to limit the rotation of said collar with respect to said distally projecting end-piece once said collar is engaged with the distally projecting end-piece;
• and
• at least one deactivating member configured to neutralize said at least one adaptor anti-rotation member in response to a turning torque equal to or greater than a predetermined value applied to said collar when said collar is engaged with said distally projecting end-piece, thereby allowing the rotation of said collar with respect to said distally projecting end-piece.