The effect by the structure of vessel branches on patency rate in microvascular anastomosis

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This research is to define the desirable distance from ligation site to vessel branches, and to assess in microvascular anastomosis. Because the procedure to dissect around vessel branches make dominant vessel spasm, the patency rate in the group that ligated away from vessel branch is higher than the group that ligated near vessel branch. Also, the patency rate in the flow through anastomosis group is higher than the group that ligated near vessel branch.