Patent ID: 7172580

Claim:
A valve assembly for controlling a flow of fluid therethrough, comprising: a cannula body; a base member; a rotatable member; a valve sheath; each of said cannula body, base member, rotatable member and valve sheath having a proximal end and a distal end, said cannula body proximal end engaged with said base member distal end, said base member proximal end engaged with said rotatable member distal end in a manner to permit rotation of said rotatable member relative to said base member; said cannula body, base member and rotatable member aligned in said valve assembly to define an elongated passageway therethrough for passage of an interventional device, said valve sheath disposed along said passageway and having a longitudinal opening therethrough for passage of said interventional device, said valve sheath distal end being secured to said base member and said valve sheath proximal end being secured to said rotatable member, at least one of said valve sheath ends comprising a flange, at least one of said base member and rotatable member comprising a valve-receiving surface for receiving said flange; and a compression member for compressing said flange against said valve-receiving surface; a portion of said valve sheath being manipulatable when said rotatable member is rotated relative to said base member such that said valve sheath portion is twisted in a manner to constrict said longitudinal opening to comprise a seal around said interventional device when said interventional device is disposed in said passageway; said valve assembly further comprising at least one valve disk disposed in said passageway between said cannula body and said base member, said valve disk having opposing axial ends, and having a generally axial opening between said opposing axial ends for passage of said interventional device, said axial opening conformable to said interventional device to comprise a seal when said device is disposed in said passageway.