| 摘要 |
A medical safety injector (1) includes a needle hub (11) connecting to a needle (10); a hollow barrel (12) which can fasten the needle hub (11) and l ead the needle hub (11) to retract to the hollow barrel (12) after the injec tion has finished; and a plunger combination (14) disposed in the hollow bar rel (12), wherein the plunger combination (14) includes a retractable plunge r (15) and a hollow shank (16) sheathing to the retractable plunger (15), th e outer side wall of the retractable plunger (15) forms at least one protrus ion (150) on the sheathing area with the hollow shank (16), in order to corr espondingly block to at least one concave forming on the inner side wall of the hollow shank (16). When the injection of the medically safety injector ( 1) finishes and the operator continuously applies force to the plunger combi nation (14), the retractable plunger (15) may retract into the hollow shank (16), and leaves a barrel space to accept the needle hub (11), thus improves the operation of the singlehanded injection.
|
