Geometrical approach to the end-to-side anastomosis.

We analyzed the procedure of performing an arterio- or venotomy in rats and changed it from parallel to the long axis to perpendicular to the long axis. Simultaneously, geometrical analysis of the shape of an arterio- or venotomy led to a new approach for the end-to-side anastomosis in experimental free flap transplantation. This new method was applied in 268 anastomoses. It necessitated only six sutures and resulted in 100% arterial early and late patency and in 99% venous early and late patency.