| 摘要 |
The end of the tubular body is fixed by the needle. The deployment element (37) includes a pneumatic element for displacing the needle cover (35), from its retracted position towards its deployed position and the pneumatic element comprises: a thrust chamber delimited by a cavity; a displacement piston (40) sliding in the cavity interdependent of the reference body and the needle cover; a pressurization body; and a support guard is assembled between the pressurization positions. The needle cover is assembled between the retracted position and the deployed position. The pressurization body comprises an actuation surface of the injection piston (23) to move the piston from its rest position to its pressurization position. The deployment element further comprises a blocking element, which is releasable when the pressurization body reaches a release position. The support (33) comprises immobilization element of the pressurization body. The pressurization chamber having a transverse section in the displacement areas of the pressurization body, which is higher than the transverse section of the thrust chamber of the needle cover. |
