Rabbit model for evaluation of a long small-caliber vascular graft.

We developed an experimental method for evaluating the properties and healing process of a long, small-caliber vascular graft in a small animal. Eight rabbits were used. A left thoracotomy was performed and the thoracic aorta was isolated. The aorta was clamped and excised in the middle without a temporary shunt. A 15-cm-long by 4.0-mm-ID segment of a vascular graft was implanted end to end. After the blood flow of the aorta was restarted, the long graft remained in a big loop shape in the thoracic cavity and showed no tension. The major advantage of this technique is that, although it is simple, we are still able to evaluate a long, small-caliber vascular graft in a small animal.