Kawasumi Laboratories. Inc.

Other

Kazunori Murakami

Hiroo Iwata

Tetsuya Suzuki

Masatoshi Watanabe

Kazuaki Mitsudou

Hiroaki Nomiyama

Kouji Mori

Yoshiharu Yoshikawa

Ken Ikeuchi

Shuzou Yamashita

[Object] To provide a medical instrument capable of more effectively inhibiting a cracking and separation than conventional ones. [Solution Means] A stent comprising a substrate layerof which at least the surface is composed of a metal material, a carbon compound layerthat is formed so as to coat the surface of the substrate layerand that contains at least one metal element, a first DLC layerthat is formed so as to coat the surface of the carbon compound layerand that is free of fluorine, and a second DLC layerthat is formed so as to coat the surface of the first DLC layerand that contains fluorine. The stent being constituted to satisfy the relationship defined by the expression of 'A&#x3e;A&#x3e;A', wherein Ais a surface free energy of the carbon compound layer, Ais a surface free energy of the first DLC layer, and Ais a surface free energy of the second DLC layer

Medical instrument and metal product

A stent having a generally tubular body formed of ring units formed of a plurality of cells each and expandable in the radial direction, wherein each ring unit is constituted of cells connected to one another above and below, arranged to surround the center line of the stent, the ring units are arranged in the axial direction of the stent, and are connected with connector portions, each connector portion is formed of curved portions each having an arch and a generally linear portion continued thereto, 3 to 8 cells are arranged in the axial direction per 10 mm of the length of the stent, and the ratio of the length of the cell in the axial direction and the length of the connector portion is determined such that on the basis that when the length of the cell is 100, that of the connector portionto, thereby securing flexibility and radial sustaining force.

Stent

Growing community of inventors

Oita, Japan

Kazunori Murakami