Patent ID: 8500775
Filing Date: 2013-08-06
Classification: A61B,A61F

Abstract:
1. An endovascular filter-valve device for reducing a reflux of an embolizing agent in a vessel during an embolization therapy procedure, the vessel having a vessel wall, the device comprising: an elongated delivery catheter having a proximal end and a distal end defining an open tip, said delivery catheter capable of delivering the embolizing agent through said open tip of said distal end; a substantially frustoconical valve having a proximal end and a distal end, said valve fixed at its proximal end to said distal end of said catheter such that embolizing agent delivered through said delivery catheter feeds into said proximal end of said valve, said valve having a plurality of filaments in the form of a braid, said valve configured and biased to radially expand from an undeployed state to a deployed state, said valve opening from said undeployed state to a completely open state in less than one second in an at-rest fluid having a viscosity of 3.2 cP; and a filter formed of a material separate from said braid and fully integrated with said valve from said proximal end to said distal end of said valve, said filter having pores of a characteristic diameter of less than 500 μm, 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 the local biological fluid pressure about said valve, and 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 said valve and said filter is permitted, and when said 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 contacts the vessel wall and said characteristic diameter of said pores of said filter renders said filter impermeable to the embolic agent such that the valve is thereby adapted to reduce reflux, wherein integration of said filter and said valve causes both of said filter and said valve to change shape and move together between said valve-open and valve-closed configurations as fluid pressure conditions about said valve change.