| 摘要 |
PROBLEM TO BE SOLVED: To restrain the occurrence of stricture and obstruction in the vicinity of the inosculated part of a bypass blood vessel and an anastomic blood vessel in the case of transplanting the bypass blood vessel. SOLUTION: In the case of transplanting a bypass blood vessel 3 formed out of an autogenous blood vessel, an artificial blood vessel or the like to a region between blood vessels 1 and 2 at two positions in a human body, a blood flow adjuster 4 is laid in the bypass blood vessel 3. This blood flow adjuster 4 is formed to have a stricture part 5 at an axial center position, with an inner diameter kept smaller than an inner diameter at both ends. Also, the inner diameter of the stricture part 5 is set, so that the flow rate, velocity or pressure of a blood flow at the side for receiving a blood flow from the bypass blood vessel 3, suit the inosculated blood vessel 2. For the flow rate or velocity of a blood flow at the side for receiving the blood flow from the bypass blood vessel 3 to become suitable for the inosculated blood vessel, shear stress resulting therefrom and acting on the wall of the blood vessel is at a value between 10 and 50dyne/cm<2> in the case of a vein, and at a value between 1.5 and 15dyne/cm<2> in the case of an artery. The flow rate and velocity are determined to suit the stresses. |
