| 摘要 |
<p>A non-reuseable syringe element has a syringe body (32) having a lower extremity closed by a base (34) provided with a cone (52) to receive a needle (44) and a shaft (42) terminated by a piston (36) sliding tightly in said syringe body. A resiliently flexible plate (60) having a diameter geater than the inner diameter of the syringe body and thus inducing through its curvature a weak frictional force enabling the displacement of the shaft in a first direction and a strong frictional force opposing displacement of the shaft in the other direction is mounted in the shaft. The direction of curvature of the washer can be inverted by directing the washer (60) into the groove (68). To avoid attempted re-use of the syringe element, a zone (66) of weak resistance to breakage by traction is provided on the shaft. This zone breaks under a traction lower than the strong frictional force, but greater than the weak frictional force. The plate (60) may either be mounted on the shaft and rest resiliently against the syringe body, or may be mounted on the syringe body and rest resiliently against the shaft. The syringe comprises a syringe barrel, one extremity of which is closed by a base (310) having a nozzle (312) pierced by a channel (314); a shaft terminated by a piston sliding inside the syringe barrel; and a hollow needle (308) having a base (324) and a conduit (326). This syringe also comprises fixing means for the needle onto the nozzle each composed of a tongue (328), furnished with a cavity (338) communicating with the channel (314), and an indentation (330). A tongue is provided on the outside face of the nozzle (312) and the indentation on the inside face of the base (324). Finally, the syringe has recesses (340) which destroy the seal when the tongues are removed.</p> |
