Abstract

• The free skin flap transferby microvascular anastomosis has been recently for wide employment in reconstructive surgery. But for the survival of the free skin flap, the blood supplying network obviously is a sine qua non, so the ori-ginal free skin flap requires at least one artery for blood inflow and one vein for drainage. But arteries are not so supeficial as veins, so the flap is very bulky and the sacrifice of the donor artery is the inevitable. And, it is difficult to find an adequate artery in the distal part when a flap is designed, and we can find superficial veins from outside in the most parts of the body. It the arterial inflow is the first prerequisite, author suppose that the arterial inflow through the venous system also can save or nourish the distal part of a flap. So author made the new experimental free flap pattern which arterial inflow through the venous system also can save or nourish the distal part of a flap. So author made the new experimental free flap pattern which arterial inflow through the venous system. And according to the venous drainage pattern, author made the two different groups using rats. In one group, venous anastomosis was done, in the other group, arteriovenous anastomosis was performed which means venous blood drain through arterial system of the flap. And experimental comparisions were done between two different venous drainage patterns.