| 摘要 |
A syringe arranged for a single use is described. The syringe comprises a cylindrical body for holding a liquid therein, a nozzle for drawing up and eject ing the liquid and a plunger including a plunger head arranged for a sliding fit wit hin the cylindrical body such that the plunger slides along the cylindrical body in an uptake direction for taking the liquid up into the cylindrical body and an expel direction for ejecting the liquid from the cylindrical body. The syringe furthe r includes either individually or any combination thereof: one-way locking means, a valve system, a stopper and a spring-loaded ball for preventing the syringe from being used more than once. Specifically, the one-way locking means is arranged to lock the plunger in place within the cylindrical body one the plunger has ejected the liquid. The one-way locking means may comprise a spring-loaded rib arranged to project inwardly from the cylindrical body proximal to the bottom of the cylindrical body. The stopper is arranged to prevent the plunger from being separated from the syringe. The spring-loaded ball is arranged, when released, to plug the nozzle as a result of suction generated when the plunger slides in the uptake direction, thereby preventing liquid from being drawn up. The valve syst em is arranged within the plunger head such that when the valve system is activated , air flows through the plunger head so that no suction is generated, thereby preventing liquid from being drawn up. Thus, any one of these features or any combination thereof may be used to prevent the syringe from being reused.
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