Implantable vascular device

A method of controlling flow in a body lumen, the method comprising:

• forcing a membrane of a stentless valve against a wall of a body lumen with a balloon such that a barb attached to the membrane extends into the wall and anchors the membrane in the body lumen in the absence of a stent, wherein the anchored membrane is thereupon moveable between a first position and a second position in response to the direction of fluid flow through the lumen, wherein said membrane in said first position restricts fluid flow through the lumen in a first direction alone or in combination with one or more additional membranes, and wherein said membrane in said second position permits fluid flow through the lumen in the first direction alone or in combination with one or more additional membranes.

A method of controlling flow in a body lumen, the method comprising:

• moving a membrane of a valve between a first position and a second position in response to the direction of fluid flow through the lumen, wherein the valve is percutaneously implanted in the body lumen and is free from any separate support frame, wherein said membrane in said first position restricts fluid flow through the lumen in a first direction alone or in combination with one or more additional leaflets, and wherein said membrane in said second position permits fluid flow through the lumen in the first direction alone or in combination with one or more additional leaflets.

A method for treating a patient comprising:

• providing a percutaneously implanted valve anchored in a body lumen of the patient in the absence of a stent, the percutaneously implanted valve comprising one or more leaflets and lacking radial expandability sufficient to anchor itself to the wall of the body lumen.