| 摘要 |
A single-use device for injection comprises: (1) a syringe, provided with a front nose and supporting an injection needle and having a rear collar; and (2) a device for protection of the injection needle of the syringe after use comprising a protective sheath consisting of rear and front bodies to be rendered integral, and a ring, having a mechanism for locking the syringe, accommodated in the rear body. A single-use device for injection comprises: (a) a syringe (1) provided with a front nose (1a) supporting an injection needle (2) and having a rear collar (1b); and (b) a protection device for protection after the syringe has been used. The syringe delimits a chamber which is filled with a dose of fluid to be injected and is sealed by a piston (4) which is rendered integral with one of the ends of a piston rod (5) provided with a thruster (6) at its opposite end. The protection device comprises a protective sheath (7) and a ring (24). The sheath consists of front and rear tubular bodies (8, 9) provided with an assembly mechanism which makes it possible to render the bodies integral to one in the extension of the other. The front body (8) has a diameter which is conjugated relative to that of the syringe and a length designed to accommodate the syringe partially. The rear body (9) has a diameter which is larger than that of the collar of the syringe body and comprises finger-support units (23). The ring is disposed in the rear body which comprises a mechanism (29, 31) for locking the collar. This makes it possible to introduce the syringe by presenting the needle opposite the rear body of the protective sheath. The ring and the rear body comprise: (i) a first mechanism (20, 22, 27) for relative locking in translation, which can make it possible to introduce the ring in the rear body, by presenting the ring opposite the surface of the assembly of the of the latter with the front body, and defining a first locking position (the position for injection) which allows injection to take place when the device for injection has been assembled; and (ii) a second mechanism (20, 22, 28) for relative locking in translation, which defines a second locking position (the position after use) which is obtained after rearward sliding of the ring inside the rear body in which the injection needle is accommodated in the front body. The ring and the front body is provided with a stop mechanism which keeps a resilient mechanism (42) compressed in the first locking position, for injection. The ring or the rear body comprises a rear portion which is radially deformable, and supporting the first locking mechanism in translation. This portion is designed to be deformed by the thruster (6) of the piston rod (5) at the end of the path of the latter so as to release the first locking units and to permit displacement of the ring towards its second locking position, for protection after use. |
