| 摘要 |
A cartridge based syringe system utilizes a cartridge piston (125) having an interlocking needle receiving cup (124), retraction cage (131) structure graspab le by a conventional plunger hook (117), and a breakaway needle assembly (123) in order to provide simple and reliable retraction of a needle cannula into a disposable med icant cartridge (109). Needle retraction is accomplished by simply reversing the movem ent of the plunger at the end of an injection stroke. A conventional type of dental syringe can be readily converted into a safety syringe providing the aforementioned need le retraction simply by replacing the disposable parts, i.e., the needle assembly a nd the medicant cartridge.
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