Venous valve prosthesis

A venous valve prosthesis for transporting blood in a vein in a predetermined direction, comprising:

• a hollow-cylindrical support structure;
• a skirt connected to the support structure forming a closed, circumferential jacket of the support structure;
• and
• a valve leaflet arrangement with a first valve leaflet and a second valve leaflet, each being connected to the skirt,
• wherein a downstream edge of the first valve leaflet and a downstream edge of the second valve leaflet are opposite to each other and configured in such a manner that in a first state of the valve leaflet arrangement they form an opening for blood to flow through in the predetermined direction and in a second state of the valve leaflet arrangement the opening is closed to prevent a backflow of blood in a direction opposite to the predetermined direction, wherein the ratio of the inner diameter of the support structure to its length in the predetermined direction is at most 1, wherein the support structure comprises interconnected struts configured such that, in the implanted state, they rest against an inner vessel side of the vein over most of their length, wherein the two valve leaflets are each connected with an upstream edge to the skirt, and wherein a first end of the downstream edge of each of the first valve leaflet and the second valve leaflet are connected to each other and to an apex of a first arcuate strut of the support structure, wherein a second end of the downstream edge of each of the first valve leaflet and the second valve leaflet are connected to each other and to an apex of a second arcuate strut of the support structure, wherein the first arcuate strut and the second arcuate strut oppose each other in a direction transverse to the predetermined direction and are movable in a direction transverse to the predetermined direction such that a transition from the first state to the second state of the valve leaflet assembly can be effected upon an increase in the inner diameter of the vein.