| 摘要 |
<p>The syringe comprises a cylindrical body (1), a piston (11, 15) which can be displaced linearly in the body (1), a needle holder (28) which can also be displaced linearly in the body (1) and with respect to the piston (11, 15) and a needle (24). The needle (24), before the syringe is used, is located, hermetically protected, inside the cylinder (1), and is mounted on the needle holder by means of a coupling of the press button (press stud) type enabling it to be detached from the needle holder. The body (1) of the syringe is closed off at its distal end by a closure piece (4) including an elastomer (protective) cap (9) which can be perforated by the needle. The needle holder (28) and the distal closure piece (4) include formations (31, 10) for coupling by snap-fitting which cannot be unlocked once snap-fitted. The rear end of the needle (24) and the piston (11, 15) include formations (20, 26) for coupling by snap-fitting which cannot be unlocked once snap-fitted. The minimum distance between the piston (11, 15) and the needle holder (28) is determined by an element (29), the compression strength of which is lower in the damp or wet state than in the dry state. <IMAGE></p> |
