| 摘要 |
A plunger having a generally converging distal portion, and a proximal face on which is mounted a coupling structure. The coupling structure is transversely engageable by, and transversely disengageable from, a driving mechanism of a power-driven angiographic syringe, and once engaged, cannot be disengaged by rotation of the driving mechanism relative to the plunger in the absence of transverse translational movement of the driving mechanism and plunger relative to one another. The coupling structure may include a pair of laterally spaced-apart retention members, each comprising a leg rearwardly extending from the proximal face of the plunger and joined at a rearward part thereof to a laterally extending bridge segment, to the inner extremity of which is joined a pair of oppositely transversely extending flexible, resilient flange elements. The flange elements of the respective retention members thus define a transverse channel therebetween, with marginal portions thereof having reduced width dimensions relative to a medial portion thereof. Such plunger has utility in angiographic syringes of a type employed with power injector means which comprise a driving mechanism with a head engageable with the coupling structure of the plunger.
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