The Unilink/3M Precise anastomotic device for microvascular anastomoses has been evaluated in 38 critical anastomoses in 26 selected patients. The microvascular anastomosis was usually completed within three minutes by a single surgeon. There was only one failure, when an arterial anastomosis clotted because of a technical error. In all patients tissue survival was dependent on patent mechanical anastomoses (critical anastomoses) and the follow-up period was more than three years.