| abstract |
A double-weave vascular prosthesis includes an inner layer that contacts a flow of blood, and an outer layer in contact with the inner layer and having an inner layer-covering rate C (%) of 15%≦C≦75% defined by formula (1): n C =[{( W 1× D 1+ W 2× D 2 )×25.4− W 1× W 2× D 1× D 2 }/(25.4×25.4)]×100 (1),n n where D 1 is a warp density (ends/25.4 mm) of the outer layer, D 2 is a weft density (picks/25.4 mm) of the outer layer, W 1 is an apparent width (mm) of a warp yarn of the outer layer, and W 2 is an apparent width (mm) of a weft yarn of the outer layer, and the apparent width of each yarn is determined as a mean of measurement values for the widths of randomly selected five threads exposed on a surface of the woven structure. |