| 摘要 |
<p>An auto-injector for a medicament prefilled syringe, having a head at one end and fitted with a needle at the other end, said auto-injector incorporating a first device D1 wich makes automatic the needle penetration into the user's body and controls a second device D2 which performs the medicament injection, said first device comprising: a cylindrical body (1) formed for receiving a syringe (4) and provided at its upper end with a collar forming a seat suitable to bear the head of said syringe, a sliding tubular element or slider (5) concentric to said body and adapted to slide on a cylindrical surface of said body, one of said body (1) and slider (5) being formed with a bevelled projection and the other of said body (1) and slider (5) being formed with a shoulder (11); a resilient ring (9), designed for being partly placed between said projection and said shoulder, arranged in such a way that ring (9) prevents the reciprocal movement of body (1) and slider (5) thus maintaining the latter in such a position to cover the entire needle (10) of the syringe, and the resilient ring being designed for spreading when a predetermined force exerted on the slider is reached and so allowing reciprocal movement of body and slider, said slider reaching a position in which said needle is uncovered and penetrates into user's body, said slider being fitted with an appendix disposed for releasing a triggering means on said second device when said reciprocal movement is completed with the result of having the medicament injection beginning only after the complete needle penetration avoiding any medicament delivery at not desired depth or site.</p> |
