Stress at vascular anastomosis in relation to host artery: Synthetic graft diameter

Shear stress at host artery: Synthetic graft anastomoses was calculated from measurements made on Dacron prostheses placed in the abdominal aorta of dogs. Results indicate that the minimum stress at the anastomoses occurs when the graft-to-host artery radius ratio is approximately 1.4 cm. A comparison of stress magnitudes indicates that for any ratio between 1.0 and 1.6, the stress at the anastomoses is less than one-thirtieth of the yield stress for No. 6-0 suture, suggesting that failure is not due to suture rupture but to suture tearing through the arterial wall.