Automatic Injection Device

Abstract: the present 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 between a proximal position and a distal position; a safety shield slidably mounted within the body between a distal initial position and a proximal second position; an outer shell enclosing the body, the outer shell being slidably movable in a distal direction relative to the body; a plunger rod slidably arranged in the body, the plunger rod including a proximal flange releasably locked in a proximal initial position by at least one flexible arm of the body, the plunger rod being movable in a distal direction when the proximal flange is unlocked to engage the stopper with a distal tip of the plunger rod; a cam cooperating with the safety shield so that a translation of the safety shield from the distal safety position to the proximal second position causes the cam to rotate within the body to an unlocking position; and a button slidably mounted at a proximal end of the body. in the initial position, the button is prevented from moving distally by the cam and, when the cam is in the unlocking position, the button is allowed to move in the distal direction. the outer shell cooperates with the safety shield and the button such that, when a user pushes the outer shell onto a patient's skin to perform an injection, the safety shield causes the cam to move to the unlocking position so as to unlock the button and the outer shell further pushes the unlocked button in the distal direction so as to cause the at least one flexible arm of the body to deflect outwardly to release the proximal flange of the plunger rod, thereby allowing the plunger rod to move to the injection position.

Inventor(s): Franck Carrel, Anne Guirimand

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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