An endovascular valve device for use in a vessel during a therapy procedure includes a catheter having at its distal end a valve. The valve is constructed of a braid of elongate first filaments coupled together at their proximal ends in a manner that the first filaments are movable relative to each other along their lengths. The first filaments have a spring bias that radially expands the valve. A filter is provided to the braid formed by electrostatically depositing or spinning polymeric second filaments onto the braided first filaments. The lumen of the catheter is in communication with the center of the valve.L'invention porte sur un appareil utile dans une intervention d'embolisation et permettant un écoulement sanguin vers l'avant sensiblement non limité dans un vaisseau et réduisant ou arrêtant le reflux (régurgitation ou écoulement vers l'arrière) d'agents d'embolisation introduits dans le sang. L'invention porte également sur un procédé d'utilisation de l'appareil.
