| 摘要 |
<p>A hypodermic injection system (7) with a retractable needle (9) wherein the needle (9) retracts within an interior cavity (71) of a syringe plunger (59), so that the needle (9) is safely and confinedly held within the plunger (59) for ease of handling and transport, while remaining safely therein. A cylindrical spring housing (21) has resilient fingers (23) which can capture a coiled spring (15) which biasly holds a needle holder (11) against the retaining force of the resilient fingers (23). The plunger (59) has a frangible end (65), which, when engaging the resilient fingers (23) under a pre-determined amount of force, dissociate while remaining outwardly tapered shoulders (68) spread the resilient fingers (23), allowing the coiled spring (15) to eject the needle (9) and its holder (11) into the interior cavity (71) of the syringe plunger (59).</p> |
