Patent ID: 7618401

Claim:
A device for injecting a product, particularly for medical use, which comprises: a body housing a hollow injection needle and a container containing the injectable product; the needle is connected to the body but able to move relative to the latter between an injection position and a retracted position; a plunger that slides in the body and is displaceable relative to the latter to perform the injection; said container is closed at one end and is connected to this plunger but is able to move relative to the latter between a position that enables the injection to be performed and a retracted position; a piston engaged in the container and so shaped to have a blind hole located adjacent a peripheral portion, wherein, in a first configuration of the piston or relative position of this piston and of this container, it closes the container in such a way as to isolate the product from the environment outside this container and, in a second configuration of the piston or relative position of this piston and of this container, said peripheral portion of said piston is deflected into said blind hole so as to allow the product to pass between said piston and said container and out of the container without said piston being pierced, wherein the piston is spaced from, and not in contiguous contact with, the needle with the piston being in the second configuration or position; a flange formed at the opposite end of the container from the closed end of this container; and at least one tab able to move in the radial direction of the plunger between a radially inward position, in which said flange is connected to the plunger, and a radially outward position, in which said at least one tab is withdrawn radially wide of this flange, thereby releasing the flange.