| 主权项 |
1. An entry device for providing access to an interior of a body vessel through an opening in a wall of the vessel for removing an elongated indwelling structure therefrom, said elongated structure extending through the opening such that a distal end of said elongated structure is disposed along the body vessel interior and a proximal end of said elongated structure extends exteriorly to the body vessel, wherein at least a portion of the body vessel wall opening is enclosed around said elongated structure in a manner to impede a removal of said elongated structure from the vessel, the device comprising:
an elongated sheath and a tip positioned at a distal end of said sheath, said elongated sheath and tip having respective passageways extending therethrough, said passageways sized and aligned such that said elongated structure is receivable therein, said elongated sheath having a rigidity sufficient to permit initial entry of said tip through the enclosed portion of the vessel wall opening by at least one of rotational and axial movement of a proximal end of said sheath, said tip having a radially-outwardly directed disruptor disposed along an outer surface thereof, said disruptor configured for achieving said initial entry through said enclosed portion of the vessel wall, said disruptor comprising a plurality of helices extending along the outer surface of said tip and projecting in a generally radially outward direction from said surface, said helices originating at a distal edge of said tip and extending proximally therefrom, wherein said helices each comprise a uniform cross-section along a length thereof, and wherein said helices each comprise a distal end that terminates adjacent to a distal-most edge of the tip and projects radially-outwardly from the outer surface of said tip, the distal ends of said helices each comprising a planar distal face that is disposed within a transverse plane defined by the distal edge of the tip and oriented perpendicularly to a longitudinal axis of the tip. |
