| 摘要 |
A hyperdermic syringe having a plunger which separates from a piston inside a barrel of the syringe after a downward stroke of the plunger preventing reuse of the syringe. The plunger breaks breakaway portions mounted inside the piston when pushed downward to unload the syringe effectively separating the plunger from the piston and destroying the syringe, preventing the piston from being withdrawn for the purpose of reloading the syringe. In another embodiment, a connector is used to releasably engage a plunger to a piston. Downward movement of the plunger causes upward extensions of the connector to move toward each other and lock together. The plunger disengages from the connector and piston after the extension lock together. A modified tip portion of a barrel containing a valve ball and valve flaps may be used to prevent the syringe from being used after a single use discharging medicinal fluid from the syringe. The valve ball blocks flow of medicinal fluid into the syringe after use of the syringe. The modified tip portion may be used alone or in conjunction with the designs which disengage the plunger from the piston after a single use of the syringe.
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