| 摘要 |
<p>Disclosed is a safe self-destructing injector with a pull-back type needle, an inner-sleeve type pull-back locking assembly (7) is arranged inside a needle base body (3) thereof; a part of the outer wall of the needle base body (3) near the upper part forms a cyclic elastic sealed limiting-portion (9); a cyclic buffer space (10) is formed at the inner side of the cyclic elastic sealed limiting-portion (9); a sealed clamping portion (11) is formed at the outer wall of the cyclic elastic sealed limiting-portion (9); a cyclic sunk portion (12) is formed at the outer wall of the cyclic elastic sealed limiting-portion (9) at the lower part of the sealed clamping portion (11); a cyclic raised clamping-locking portion (13) is arranged at the inner wall of the inner-sleeve type pull-back locking assembly (7) near the opening at the lower part; a cyclic clamping groove (14) is formed at the upper part of the clamping-locking portion (13); a cyclic step (15) is formed between the upper part and lower part of the needle base body (3); a sealed rubber gasket (32) is sleeved with the cyclic step (15); an asymmetric elastic locking pull-back assembly is arranged at the end part of a core bar (4); one side of the asymmetric elastic locking pull-back assembly forms an angle A of 1 degree to 178 degrees with the bar body-symmetrical centerline of the core bar (4) and the other side of the asymmetric elastic locking pull-back assembly forms an angle B of 1 degree to 178 degrees with the bar body-symmetrical centerline.</p> |
