An artificial blood vessel has a trunk portion which forms a part of the blood vessel and also has branch portions which are branched from the trunk portion. The branch portions are provided with access ports into which a needle, for discharging liquid out of a human body or introducing the liquid into the human body, is inserted. Tubular reinforcement members integrated with the blood vessel wall of the trunk portion are disposed at positions of the trunk portion, the positions being those from which the branch portions are branched, and at portions adjacent to the positions of the trunk portion. A lateral force at the time of needle insertion is borne by the reinforcement member, and this prevents the trunk portion from deforming. Thus, the configuration prevents the artificial blood vessel from deforming due to a force applied when a needle for discharging liquid from a human body or introducing the liquid into the human body is inserted into an access port of the artificial blood vessel.本發明為包含:人工血管10,具有成為血管一部的幹部12,與由幹部分岐的枝部14、16;接入端口20,配置於枝部14、16,扎針由體內抽出液體,或往體內輸入液體時所用。於幹部12之枝部14、16分岐的位置及鄰接部分上,配置與幹部的血管壁成一體的管狀補強組件30。穿刺時,因補強組件30承受橫向施力,防止幹部12閉塞。藉此,為了由體內抽出液體,或往體內輸入液體,將針刺入人工血管的接入端口時加諸的力道,並不會使人工血管變形。10...人工血管12...幹部14、16...接通用枝部18...分流用枝部20...接入端口22...中心部24...周邊部26...環狀溝28...凹凸部30...補強組件32...開口
