| 摘要 |
A percutaneous access device having at least one substantially rectilinear passageway that extends between the internal region of a living body and the region exterior of the body when the device is anchored therein. A second passageway intersects with the first so as to provide communication between the internal region and the exterior region through the lower portion of the first rectilinear passageway and the second passageway. Disposed within the rectilinear passageway is a plunger having a sealing tip on the distal end thereof and access to the internal region of the body is achieved by withdrawing the sealing tip of the plunger past the point where the second passageway intersects the rectilinear passageway. The plunger shaft has a non-uniform cross section along its length and the exterior opening of the rectilinear passageway is in the form of a keyway so that the plunger is movable within the rectilinear passageway only upon selective rotation of the plunger.
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