CLAIMS
1. A tubular woven construct in a tubular configuration woven
by interlacing warp and weft yarns, the warp yarn containing
at least in part an elastic fiber yarn having a filament fineness
of 1.0 dtex or more, the weft yarn containing at least in part
a microfiber yarn having a filament fineness of less than 1.0
dtex.
2. The tubular woven construct according to claim 1, which
satisfies the following formula: Cfa < Cfb, wherein Cfa is a
warp cover factor and Cfb is a weft cover factor.
3. The tubular woven construct according to claim 1 or 2, which has an elongation of 4% or more in the warp direction per mm in width of the tubular woven construct under a load of 3.3 N, and has an elongation at break of 50% or less.
4. The tubular woven construct according to any one of claims 1 to 3, wherein the elastic fiber yarn having a filament fineness of 1.0 dtex or more contains composite cross-section fiber filaments formed of two types of polymers having different thermal shrinkage properties.
5. The tubular woven construct according to claim 4, wherein the two types of polymers having different thermal shrinkage properties are polyethylene terephthalate and polytrimethylene terephthalate.

6. The tubular woven construct according to any one of claims 1 to 5, which contains two or more layers.
7. The tubular woven construct according to claim 6, wherein a layer other than an innermost layer comprises a weft yarn containing at least in part a monofilament yarn having a thickness of 20 (jiti or more.
8. The tubular woven construct according to any one of claims 1 to 7, whose inner surface has a water permeability of 500 mL/min-120 mmHg (16 kPa) -cm2 or less.
9. A vascular prosthesis containing the tubular woven construct
according to any one of claims 1 to 8 as a base material.
10. The vascular prosthesis according to claim 9, which has an antithrombogenic material layer formed by binding of an antithrombogenic material to an inner surface of the tubular woven construct to be in contact with blood, wherein the antithrombogenic material layer has a thickness of 1 to 600 nm.
11. The vascular prosthesis according to claim 10, wherein the antithrombogenic material contains a sulfur-containing anionic compound having anticoagulant activity.
12. The vascular prosthesis according to claim 10 or 11, whose inner surface, when subjected to X-ray photoelectron spectroscopy (XPS), shows an abundance ratio of sulfur atoms of 3.0 to 6.0 atomic percent relative to all the atoms on the

inner surface.
13. The vascular prosthesis according to any one of claims 10 to 12, whose inner surface, when subjected to X-ray photoelectron spectroscopy (XPS), shows an abundance ratio of nitrogen atoms of 6.0 to 12.0 atomic percent relative to all the atoms on the inner surface.
14. The vascular prosthesis according to any one of claims 10 to 13, wherein the antithrombogenic material contains a cationic polymer containing, as a constituent monomer, a compound selected from the group consisting of alkyleneimines, vinyl amines, allylamine, lysine, protamines, and diallyl dimethyl ammonium chloride, and wherein the cationic polymer is covalently bound to warp and weft yarns that form the tubular woven construct.
15. The vascular prosthesis according to claim 10, wherein the antithrombogenic material is a compound containing three types of skeletal structures, wherein the three types of skeletal structures are a hydrophilic polymer skeleton, a 4-(aminomethyl)benzenecarboxyimidamide or benzamidine skeleton, and a methoxy benzene sulfonamide skeleton, wherein the hydrophilic polymer skeleton contains, as a constituent monomer, a compound selected from the group consisting of ethylene glycol, propylene glycol, vinylpyrrolidone, vinyl alcohol, vinyl caprolactam, vinyl acetate, styrene, methyl methacrylate, hydroxyethyl methacrylate, and siloxane, and wherein the compound containing the three types of skeletal

structures is covalently bound to warp and weft yarns that form the tubular woven construct.
16. The vascular prosthesis according to claim 15, wherein the compound containing the three types of skeletal structures is a compound represented by any of the following general formulae (I) to (IV) :

wherein m and o each represent an integer of 0 to 4; n represents an integer of 3 to 1000, and n' represents an integer of 3 to 1000, with the proviso that n and n' satisfy the formula: n > n' ; and X represents a functional group selected from the group consisting of hydroxyl, thiol, amino, carboxyl, aldehyde, isocyanate, and thioisocyanate groups.
17. The vascular prosthesis according to any one of claims 10 to 16, wherein the antithrombogenic material contains an anionic polymer containing, as a constituent monomer, a compound selected from the group consisting of acrylic acid,

methacrylic acid, a-glutamic acid, y-glutamic acid and aspartic acid; or an anionic compound selected from the group consisting of oxalic acid, malonic acid, succinic acid, fumaric acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, malic acid, tartaric acid, and citric acid.