(A) Self-destructive syringeThe invention is by pushing the plunger with a hollow metal tube forward to destruct the rubber piston for preventing repeated abuse. them, there is a outer tube of a syringe and a hollow plunger. A hollow metal tube is embedded in the front-end of the hollow plunger, and then is set into the rubber piston. When finishing the injection, users only need to continue to use larger thrust to push the hollow plunger forward. And then, the hollow metal tube in the front-end of the plunger can be pushed into the protrudent cavity in the front-end of the syringe and perforates through the rubber piston. After so does, the syringe is not air-seal anymore and its integrity is destroyed.(B) Withdrawal needleThe invention is a safe needle that must be used with the self-destructive syringe. When finishing the injection, users continue to use larger thrust to push the hollow plunger of the self-destructive syringe forward to perforate through the rubber piston. Simultaneously, the hollow metal tube in the front-end of the plunger can push the hollow metal needle in the bottom of needle tube forward to cut the soft adhesion between the needle and needle-seat to separate the needle-seat and the needle. Finally, touching retraction-plate on the needle sleeve by the needle-tip, we can withdraw the needle, through the hollow metal tube cavity, into the hollow plunger and storage it. Thus we can effectively prevent needle stick injuries and reach the purpose of the safety needle.(一)自毀式針筒一藉由推桿前端中空金屬管破壞橡皮活塞前端而達到自毀功能之針筒,以防止針筒重複濫用。係包括一針筒外管和一中空推桿;中空推桿前端嵌入一中空金屬管,再套入橡皮活塞中。當注射完成後,使用者只需再使用較大推力續推中空推桿把前端的中空金屬管往針筒前端凸出空腔推進,並穿破橡皮活塞,破壞密閉功能完成自毀。(二)回縮式針頭一安全針頭,須配合前項自毀式針筒使用。係當注射完成後,使用者續推自毀式針筒中空推桿穿破前端的橡皮活塞時,可同時推動針頭座內針管下端的中空金屬管往前,切除針管與針頭座間的軟性膠合,使針頭座與針管脫離。再以針管前端碰觸針頭套上的回縮板,使針管往內經中空金屬管內腔,回縮到中空推桿中儲存,有效防止針刺傷害。10...中空推桿11...推桿前段空腔12...推桿容置中空金屬管腔13...推桿前端中空金屬管14...橡皮活塞15...橡皮活塞前端16...推桿後側安全凸起17...推桿安全線18...推桿前端凸起19...橡皮活塞後端20...針筒外管21...針筒外管腔22...針筒外管前端凸出23...針筒外管前端凸出空腔24...針筒外管後側內緣凸起
