US Patent 9993633 Graft-catheter vascular access system

A vascular access device, for implantation at least partially below the skin of a patient to provide an arteriovenous fistula, includes a graft portion coupled to a catheter portion. The graft portion is sutured to an opening in an artery while the catheter portion is inserted into a vein so that its end lies within the vein downstream from the point of entry into the vein. The device may be comprised of ePTFE with an outer polyurethane coating or the graft portion may comprise ePTFE with an outer polyurethane coating and the catheter portion may comprise polyurethane. There may also be an inner polyurethane coating. Alternatively, the device may be comprised entirely of polyurethane.