| 摘要 |
PURPOSE: To prevent an inner membrane from being thickened and to ensure an enough anchoring effect to the formed inner membrane by setting the mean fiber length of at least a layer among outer layers shorter than the mean fiber length of the innermost layer in an artificial blood vessel. CONSTITUTION: An artificial blood vessel is prepd. by laminating at least two layers 1 and 2 of drawn tetrafluoroethylene tubes with a fine fiber-knot structure consisting of fibers and knots connecting them and integrating them at joining faces 3. In this case, the mean fiber length of at least one layer among the outer layers is set to be 20-40μm being shorter than the mean fiber length being 60-200μm of the innermost layer 2. In addition, the thickness of the innermost layer 2 is set to be at least 60μm.
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