Radiopaque anastomosis marker

A radiopaque marker for internal implantation as a means for locating the site of an anastomosis during subsequent fluoroscopic examination, comprising a one-piece split ring of a radiopaque material and having a substantially circular configuration, said ring formed with a first loop intermediate the ends thereof providing a spring normally urging the ends toward one another and defining a suture receiving opening for suturing the ring to adjacent tissue, and the ends of the rings formed into closed, second and third loops, respectively, thus defining suture receiving openings and at the same time eliminating exposed sharp ends, said ring and loops being substantially coplanar and the ring being spreadable to enable placement of the ring over a sutured-in-place vein, the suture receiving openings being substantially diametrically opposite one another, thus preventing tilting of a sutured in place marker.