| 摘要 |
A single use syringe in the form of a cylindrical barrel with a port end attached to a hypodermic needle. A plunger and piston in the barrel transfer liquid into or from the syringe through a port end. The plunger includes a locking structure formed at a predetermined position. An insert at a remote end of the barrel includes at least one cantilevered, longitudinally extending resilient arm with a radially acting, inwardly extending follower at a free end thereof that rides over the plunger. When the plunger moves to a locking position, the follower engages the plunger locking structure to block any further longitudinal motion of the plunger and piston preventing any subsequent use of the syringe.
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