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In an experimental study, a new mechanical device for microvascular anastomosis was compared with suture anastomosis. In 14 rabbits, seven end-to-end and seven end-to-side anastomoses of the jugular vein to interpositional vein grafts were done with a ring-pin device and by the conventional suture method. There was no significant difference between the patency rates of mechanical and suture anastomoses. The completion of mechanical anastomoses took one-third the time required for suture anastomoses. After 10 days, histologic and scanning electron microscopic examination revealed an uneventful reparative process at the anastomotic site with media atrophy and a continuous endothelial layer. At 4 weeks, occasional foreign body giant cells were seen between the polyethylene rings and surrounding connective tissue. The study confirms that the ring-pin device is safe and provides a faster way to do microvascular anastomoses than by suturing.
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