external valvuloplasty banding of the saphenofemoral junction in insufficient great saphenous veins. venous

external valvuloplasty banding saphenofemoral junction insufficient great saphenous veins venous insufficiency treatment venoablation scientific diagram anatomical structure anterior internal valve vena medicine human leg anatomy science illustration artery medical vessel procedure blood operation disease surgical surgeon patient vein hospital surgery vascular extraluminal extraluminale valvuloplastie varicose