Abstract: A slit 8 for insertion of a guide wire 3 is formed in the peripheral wall of a tubular member 2 which is to be inserted into the left anterior descending branch. A thread 15 is tied around the peripheral wall of the tubular member 2 such that the knot 17 is placed on the peripheral wall generally opposite to the slit 8. After the tubular member 2 is inserted into the left anterior descending branch with the help of the guide wire 3, the guide wire 3 is pulled out. The thread 15 is lightly pulled to axially rotate the tubular member 2 such that the slit 8 is covered with the inner surface of the left anterior descending branch. After more than a half of a graft vessel is anastomosed to the periphery of an incision of the left anterior descending branch, the thread 15 is strongly pulled to pull out the tubular member 2. The graft vessel is completely anastomosed to the periphery of the incision.

Abstract: An adhesion preventive for preventing adhesion between vital tissues is provided. The present adhesion preventive is a molded material consisting essentially of a biodegradable and absorbable polymer. It has an advantage of requiring no reoperation for its removal since it would be degraded and absorbed after completing its function in vivo.