Automatic Injection Device

Abstract: the disclosure relates to an automatic injection device including: a body; a medical container including a barrel containing a product for injection, a distal tip provided with an injection needle and a stopper in sliding engagement within the barrel. the medical container being slidably arranged in the body (10) between a proximal initial position and a distal position; a safety shield slidably mounted within the body between a distal initial position and a proximal second position; a plunger rod slidably arranged in the body. a non-circular proximal end releasably locked in a proximal initial position and a distal tip adapted to push the stopper in the distal direction when the proximal end is unlocked; a cam cooperating with the safety shield so that a translation of the safety shield from the distal initial position to the proximal second position causes the cam to rotate within the body to an unlocking position; a plunger retainer pivotally mounted in the body. a non-circular proximal opening arranged distally from the proximal end of the plunger rod in the initial position, said opening and the proximal end of the plunger rod having substantially complementary shapes, the plunger retainer being coupled to the cam so that, in the initial position, the shapes of the proximal end of the plunger rod and of the proximal opening are angularly offset from each other and, in the unlocking position, the shapes of the proximal end of the plunger rod and of the proximal opening are axially aligned, thereby allowing the plunger rod to move in the distal direction through the proximal opening of the plunger retainer.

Inventor(s): Franck Carrel

CPC Classification: A61M5/2033 (DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals ; means for inserting tampons ; devices for administering food or medicines orally ; containers for collecting, storing or administering blood or medical fluids ); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery ; chemical aspects of surgical articles ); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents )})

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