| 摘要 |
<p>A disposable syringe mainly used in medical treatment facility and formed so that the piston (4) is pulled into the inside of the syringe body (21) with the needle support (6) by pulling out the piston (4) after the locking projection (9) of the piston *tip is inserted into and engaged with the locking hole (70) of the needle support (6) by pressing in the piston (4). The locking structure for preventing the needle support (6) from slipping off in one end direction of the syringe body (21) is provided between the inner peripheral face of the smaller-diameter portion (23) and the outer peripheral face of the needle support (6) and the seal structure for preventing liquid leak is formed in the locking portion of the locking structure (100) and ,when the locking projection (9) is inserted into and engaged with the locking hole , the needle support (6) is deformed to expand the inner peripheral face of the smaller-diameter portion (23) in the radial direction and disengage the engagement of the locking structure (100). With the sealability of the seal structure (110) kept in high level, drawing out (removing) of the needle support (6) is made smooth owing to the expansion of the smaller-diameter portion (23). <IMAGE></p> |
