SPIRIT WITH ITS AUTOMATIC BACKGROUND NAIL.

摘要

PCT No. PCT/FR90/00572 Sec. 371 Date Sep. 4, 1992 Sec. 102(e) Date Sep. 4, 1992 PCT Filed Jul. 27, 1990 PCT Pub. No. WO91/13643 PCT Pub. Date Sep. 19, 1991.A syringe comprises a body (1) which carries the needle (6), a piston (13), a protective sheath and a spring (17) arranged between the sheath (14) and the body (1). A first and a second shoulder (21) on the outer wall of the body (1) co-operate with a first spur (19) of the sheath (14) to block the body (1) in a first direction, which a second, supple spur (20) and a third shoulder (24) block the body (1) in the other direction.