US Patent 7780622 Artificial blood vessel

There is described an artificial blood vessel for use in a region of a living body which needs to be repeatedly pierced with a needle. The artificial blood vessel includes a main section having a vessel wall which includes a laminated assembly comprising an inner layer, an outer layer, and an intermediate layer positioned therebetween, and a pair of anastomotic sections disposed on the respective opposite ends of the main section. Each of the anastomotic sections has an intermediate layer thinner than the intermediate layer of the main section or is free of an intermediate layer, so that the anastomotic section as a vessel wall thinner than the main section.