Patent ID: 6197016
Filing Date: 2001-03-06
Classification: A61B,A61M

Abstract:
A large-diameter expandable sheath for use in introducing a catheter into a corporeal vessel, comprising:an elongate sheath tube formed of a flexible material having proximal and distal extremities and having a passage extending therethrough of a maximum predetermined diameter;the distal extremity of said sheath tube being folded longitudinally to a smaller folded diameter;a backflow adapter secured to the proximal extremity of said sheath tube;said backflow adapter having a central opening therein in registration with the passage in said sheath tube and having a valve disposed in the central opening of said backflow adapter and movable between open and closed positions;wherein the valve when open permits the catheter to be inserted into said sheath tube and when closed forms a hemostatic seal about the catheter;wherein the valve is in the form of a cylindrical member formed of a flexible material and having a bore therein in registration with the central opening of said backflow adapter;said backflow adapter having a rotatable device, said rotatable device configured to engage the opposite ends of the cylindrical member for causing relative rotation between the ends of the cylindrical member to cause the cylindrical member to be twisted to close the bore extending through the cylindrical member; andsaid rotatable device includes a retaining ring, a sheath tube adapter secured to opposite ends of the cylindrical member, a fixing device that fixes the sheath tube adapter to prevent rotation of the same within said backflow adapter, and a first sub-component that rotates the retaining ring with respect to the sheath tube adapter.