Abstract: A catheter balloon exhibiting improved pressure resistance of the entire membrane is formed of a membrane as a laminate of at least two layers including a polyamide elastomer layer and a polyamide layer, in which the polyamide elastomer layer is disposed at the inner side of the polyamide layer, a refractive index nr1 in the circumferential direction of a cross-section perpendicular to the axis in the inner side surface of the polyamide layer is greater than a refractive index nr2 in the circumferential direction of a cross-section perpendicular to the axis in the inner side surface of the polyamide elastomer layer, and the difference between the refractive index nr1 and the refractive index nr2 is 0.01 or greater.

Abstract: A balloon including a laminated film of at least two layers including a polyamide elastomer layer and a polyamide layer wherein the polyamide elastomer layer is formed at the inner side of the polyamide layer and a molecular weight distribution of the polymers as a whole of the balloon (weight-average molecular weight MW/number-average molecular weight Mn) ranges from 3 to 10.

Abstract: A hydrophilic material having a hydrophilic nature and being biocompatible and processable into nanoparticles wherein a hydrophilic monomer such as threitol or a hydrophilic polymer such as polyethylene glycol is attached to the ?position of an ?,?-unsaturated carboxyl group of a (co)polymer comprising an aromatic compound such as 4-hydroxycinnamic acid in which an aromatic ring is substituted by the ?,?-unsaturated carboxyl group and one or more hydroxyl groups. In particular, a hydrophilic material having a nanoparticle size which is highly dispersible in water, can well migrate into the blood and is useful as a drug carrier, a medical material and a sustained drug release material.

Abstract: A catheter balloon exhibiting improved pressure resistance of the entire membrane is formed of a membrane as a laminate of at least two layers including a polyamide elastomer layer and a polyamide layer, in which the polyamide elastomer layer is disposed at the inner side of the polyamide layer, a refractive index nr1 in the circumferential direction of a cross-section perpendicular to the axis in the inner side surface of the polyamide layer is greater than a refractive index nr2 in the circumferential direction of a cross-section perpendicular to the axis in the inner side surface of the polyamide elastomer layer, and the difference between the refractive index nr1 and the refractive index nr2 is 0.01 or greater.

Abstract: A bioabsorbable stent has a relatively high radial force and can be placed directly at the lesion without the possibility or reducing the possibility of occluding the lesion again after placement. The bioabsorbable stent is formed from a mixture composed of a bioabsorbable aliphatic polyester and an aromatic compound having one or more aromatic rings.

Abstract: A bioabsorbable material which is flexible and degradable at a controlled rate, and an in-vivo indwelling device made thereof. The bioabsorbable material is a copolymer composed of an aromatic compound having an ?,?-unsaturated carboxylic group and at least one hydroxyl group as substituents on the aromatic ring, and a polycarbonate or a monomer constituting polycarbonate. Alternatively, it is a copolymer composed of, as the first component, an aromatic compound having an ?,?-unsaturated carboxylic group and at least one hydroxyl group as substituents on the aromatic ring, as the second component, an aromatic compound having an ?,?-unsaturated carboxylic group and at least two hydroxyl groups as substituents on the aromatic ring, and, as the third component, a polycarbonate or a monomer constituting polycarbonate.

Abstract: A hydrophilic material having a hydrophilic nature and being biocompatible and processable into nanoparticles wherein a hydrophilic monomer such as threitol or a hydrophilic polymer such as polyethylene glycol is attached to the ?position of an ?, ?-unsaturated carboxyl group of a (co)polymer comprising an aromatic compound such as 4-hydroxycinnamic acid in which an aromatic ring is substituted by the ?, ?-unsaturated carboxyl group and one or more hydroxyl groups. In particular, a hydrophilic material having a nanoparticle size which is highly dispersible in water, can well migrate into the blood and is useful as a drug carrier, a medical material and a sustained drug release material.

Abstract: A bioabsorbable material which is flexible and degradable at a controlled rate, and an in-vivo indwelling device made thereof. The bioabsorbable material is a copolymer composed of an aromatic compound having an ?,?-unsaturated carboxylic group and at least one hydroxyl group as substituents on the aromatic ring, and a polycarbonate or a monomer constituting polycarbonate. Alternatively, it is a copolymer composed of, as the first component, an aromatic compound having an ?,?-unsaturated carboxylic group and at least one hydroxyl group as substituents on the aromatic ring, as the second component, an aromatic compound having an ?,?-unsaturated carboxylic group and at least two hydroxyl groups as substituents on the aromatic ring, and, as the third component, a polycarbonate or a monomer constituting polycarbonate.

Abstract: An intravascular, indwelling instrument for placement in a blood vessel includes a body having a face in contact with a maintained blood flow to be maintained and a face in contact with a non-maintained blood flow not to be maintained, and a peptide fixed to all or part of the maintained blood flow contact face or the non-maintained blood flow contact face of the body. The peptide has specific interaction with vascular endothelial precursor cells, with the peptide permitting selective adsorption and adhesion of the vascular endothelial precursor cells to cover all or part of the maintained blood flow contact face or the non-maintained blood flow contact face of the body with the vascular endothelial precursor cells thereby reducing or inhibiting the blood flow not to be maintained.

Abstract: An intravascular, indwelling instrument for placement in a blood vessel includes a body having a face in contact with a maintained blood flow to be maintained and a face in contact with a non-maintained blood flow not to be maintained, and a peptide fixed to all or part of the maintained blood flow contact face or the non-maintained blood flow contact face of the body. The peptide has specific interaction with vascular endothelial precursor cells, with the peptide permitting selective adsorption and adhesion of the vascular endothelial precursor cells to cover all or part of the maintained blood flow contact face or the non-maintained blood flow contact face of the body with the vascular endothelial precursor cells thereby reducing or inhibiting the blood flow not to be maintained.