3D-FILTER FOR STROKE PREVENTION Russian patent published in 2020 - IPC A61F2/01 A61L27/32 

FIELD: medical equipment.

SUBSTANCE: invention relates to implanted endoluminal prostheses used in prevention of blood clots migration in order to prevent ischemic stroke, and more specifically to prostheses, which are placed in the aorta to prevent embolic material and blood clots ingress into branches that deliver blood to organs, such as a brain, kidneys or liver. Implanted endoluminal prosthesis consists of a braided carcass forming a cylindrical cavity without an impermeable membrane. Braided frame is self-opening, it contains layers of wires made of biologically compatible material. Each layer forms a mesh. Grids form a grid of wires of said layers. Grid forms polygonal cells with a hole at observation at right angle to the wall of the implanted endoluminal prosthesis. Wire diameter is at least 30 mcm and not more than 150 mcm, average diameter of circle inscribed into polygonal cells with hole is at least 75 mcm and not more than 200 mcm in fully opened state. Braided frame consists of at least 128 and not more than 512 wires. Ratio of wall thickness of said implanted endoluminal prosthesis and diameter of wire is at least 3.0. In fully opened state surface coating coefficient for said woven frame is more than 50 % and less than 90 %. If implanted endoluminal prosthesis is expanded in a curved cavity having a ratio of H/W, which is 0.5–0.9, where W is arc width and H is arc height, mean diameter of circle inscribed into cells with hole is at least 75 mcm and not more than 200 mcm. Length-dependent compression ratio makes 15–40 %. Coefficient of coating of the surface of the braided frame is more than 50 % on the side of external bending.

EFFECT: purpose of the present invention is to provide an implanted endoluminal prosthesis suitable for expansion in a bent vessel, such as an aortic arch, in front of branches delivering blood to small vessels, which are equipped with brain oxygen, and additionally suitable for effective redirection of embolic material, which can quickly move with blood flow in branches of aortic arch, into descending part of aorta, thus preventing embolus occlusion from extracranial parts of small intracranial arteries in the brain.

10 cl, 15 dwg