| 主权项 |
1. An endovascular valve device for temporary use in a vessel during an intravascular procedure, comprising:
a) a delivery catheter having a distal end, a first lumen defining an inner diameter, and an outer diameter; b) a valve fixed to said distal end of said delivery catheter, said valve having,
i) a plurality of elongate first elements having a proximal end, a distal end, and a length extending therebetween,said proximal ends secured relative to each other such that an opening is provided between said secured proximal ends, said opening provided centrally about said delivery catheter, said first elements along said lengths distal of said proximal ends movable relative to each other,said distal ends of said first elements fully collapsible relative to each other into an undeployed state, and expandable from said undeployed state into a radially-expanded deployed state,ii) a filter provided to said first elements between said proximal and distal ends of said first elements,wherein once said valve is in said deployed state in the vessel, said valve is dynamically movable between an expanded valve-open configuration and a collapsed valve-closed configuration depending on a local fluid pressure about said valve,when the fluid pressure is higher on a proximal side of said valve, said valve is in said valve-closed configuration in which said distal end of said valve assumes a first diameter smaller than the diameter of the vessel such that fluid flow about the said valve and said filter is permitted, andwhen said fluid pressure is higher on a distal side of said valve, said valve is in said valve-open configuration in which said distal end of said valve assumes a second diameter relatively larger than said first diameter and in which said valve is adapted to contact the vessel wall, andwherein said filter on said first elements of said valve constrains said filter to change shape and move with said valve between said valve-open and valve-closed configurations as fluid pressure conditions about said valve change; c) an valve retaining element that extends over at least a portion of said valve when said valve is in said undeployed configuration; and d) an expandable control member between said delivery catheter and said valve that operably applies a radial expansion force to said valve to expand said valve when said control member is expanded. |
