Patent ID: 7798377

Claim:
A device for the administration of a liquid product, comprising a receptacle for storing the product, a piston plug axially moveable in an advancing direction toward an outlet of the receptacle by an output member, and a connecting mechanism comprising a plurality of hook elements comprised of flexurally elastic bristles spaced about a non-threaded portion of an outer circumferential surface of the output member, wherein the flexurally elastic bristles are arranged in at least one ring and protrude obliquely away from the advancing direction of the output member, said connecting mechanism for releasably connecting the piston plug to the output member by way of the flexurally elastic bristles to secure a connection between piston plug and output member against axial displacement of the output member relative to the piston plug wherein the connection between the piston plug and output member is releasable by relative twisting between the piston plug and the output member.