VENOUS VALVE PROSTHESIS AND METHOD FOR MAKING THE SAME Russian patent published in 2023 - IPC A61F2/00 

FIELD: vascular surgery.

SUBSTANCE: method for manufacturing a venous valve prosthesis for treatment of chronic venous valve insufficiency is characterized by the following: a flat composite blank is made from a film of porous polytetrafluoroethylene (PTFE) with a thickness of 8–12 microns and a porosity of 70–90%, with a 2.5% solution of the elastic component of the composite in a solvent applied in an amount sufficient to fill the volume of porous PTFE with an elastic component, after filling the volume of porous PTFE, the solvent is removed by evaporation at room temperature for 15 minutes, and the thickness and strength of the composite is controlled by the number of layers of the composite preform; a tubular curvilinear composite membrane is formed by winding it on a mandrin treated with an anti-adhesive spray and subsequent thermal deformation of the composite blank serving as a leaf blank and repeating the curvature of the mandrin; on the distal side, U-shaped cut-outs are made on the curvilinear blank of the valves and "ears" are left for attaching the commissures; the wall structure is covered with a fluoropolymer film by immersion in a solution of this fluoropolymer and subsequent evaporation of the solvent, then covered with fluoropolymer stent is placed on a mandrin with curvilinear blank of the valves; the proximal edge of the curvilinear blank of the valves and located on the distal side of the prosthesis "lugs" turn out on the outer side of the stent; then, the elements of the composite leaflets turned inside out on the outer side of the stent are fixed by an annular winding with ribbons of the composite billet and subsequent thermal deformation to form a single composite array. Also disclosed is a venous valve prosthesis made by the method specified.

EFFECT: improvement of hydrodynamic characteristics of valve prosthesis, ensuring simplicity of its design and manufacture.

2 cl, 3 dwg, 2 ex