Patent FR-2884721-A1 (FR)
Title: Assistance device for device of injection of a product, comprises hollow body for receiving the product, hollow injection needle for penetrating into injection site, piston placed in the body, hollow sleeve with bearing surface
Inventor: BARRELLE LAURENT
IPC: A61M5/46
Filed: 2005-04-20
Abstract: The sleeve is used to receive partly the body (2) and is arranged for axial mobility of the body between position in which the needle (7) is not exposed over its length of insertion and position in which the needle is exposed over its length of insertion. Automatic insertion elements are arranged for axial displacement of the body in the direction distal and are activated by relaxation of hollow body holding elements. Automatic activation elements are arranged for activating the protection elements in the end of injection. Protection elements are arranged for covering the needle in a position with final protection after injection and are movable by the body between an injection position in which the needle is exposed and a position of final protection in which the needle is covered. An intermediate holster is disposed between the sleeve and the body. The activation elements comprise remainder elements connected to the position of final protection and elastic remainder elements connected to the sleeve (4). The remainder and elastic remainder elements have spiral springs (9) disposed between the sleeve and the body or between the sleeve and the holster, and a strip disposed between a stem of piston (10) coupled to the body and the sleeve. Locking elements are arranged for limiting the movement of the body. An intermediate ring is retrieved on the body. The holding elements have geometrical forms in the sleeve and the ring. The geometrical forms are arranged to release the elastic remainders at the time of their withdrawal and have strap deflector that is located on the ring and engaged in supplementary edge located on the sleeve. The strap is used to deflect and disengage the supplementary edge by cooperation of its surfaces with surface of the stem of piston in the distal direction and by cooperation of its surfaces with surface of the edge proximal gripping zone under the effect of an axial load exerted on zone of proximal gripping of the sleeve and by cooperation with surface located on the sleeve under the effect of the axial pressure exerted on the zone of proximal support of the sleeve. The bearing surface of the elastic remainders are coupled with a button located on the external wall of the sleeve and are used to deflect and release the elastic remainders by pressure on the button. The deflector is located on the internal wall of the sleeve and forms bearing surface of the elastic remainders. The intermediate holster and the sleeve are separated by displacement of the sleeve. Control elements are arranged for delimiting the position of insertion of the body. Radial thrust is arranged in the sleeve to receive the support of the body. The joint of the piston is connected to the stem of the piston in the distal direction to carry out injection. The distal end of the spiral spring takes support on the face proximal of the piston joint and the proximal end of the spring takes support on the distal face of the internal wall of the zone of proximal support. The stem of piston pushes the piston joint in the direction of the injection. Couplings are arranged to move the piston joint of the position of insertion to a position of end of injection. Another remainder elements are connected to the couplings. Maintenance elements of the coupling are arranged in the position of insertion and activate the automatic injection elements. The hollow body has a flange at its proximal end. The strap is used to deflect and disengage the body of the couplings by cooperation with the flange at the end of the position of insertion. The piston joint provides a force of resistance for separation of the body. The automatic injection elements are activated, when the resultant of the forces of the remainder elements, the force of resistance of the piston joint and the force of support of the sleeve on the injection site are directed in the direction of the injection. An independent claim is included for injection of a product.