| 摘要 |
A releasably locking dilator and sheath assembly ( 10 ) and methods for releasing the dilator ( 12 ) from the sheath ( 14 ) and longitudinally splitting the sheath are provided. The assembly includes a dilator having a dilator hub ( 20 ) and a sheath having a sheath hub ( 40 ). The sheath hub has a valve ( 260,360 ) and has two opposing winged tabs ( 42 ), each tab having a perpendicular portion ( 44 ) and an angled portion ( 46 ) as well as a female threaded portion ( 53 ). The dilator hub ( 20 ) has a male threaded portion ( 30 ) designed to engage the female threaded portion of the sheath hub. The dilator is released from the sheath by rotating the dilator 90° in relation to the sheath and pulling the dilator out of the sheath. The sheath is longitudinally split by creating a couple on each of the winged tabs ( 42 ) thereby forcing the sheath and the sheath hub to split longitudinally. With the sheath and sheath hub and valve split longitudinally, the sheath is removed from around a catheter while leaving the catheter in place.
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