Abstract: 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 portion 50 to 100, thereby securing flexibility and radial sustaining force.

Abstract: A stent (1) having a generally tubular body formed of ring units formed of a plurality of cells each and being expandable in the radius direction thereof from inside, wherein each ring unit (4) is constituted of the plurality of cells (6) connected to one another above and below and arranged so as to surround the center line (C1) of the stent forming said tubular body, the ring units are arranged in the axial direction of the stent, ring units are connected through at least one site with connector portions (5), each connector portion is formed of curved portions (8) having at least 2 arches and a generally linear portion (7) continued thereto and therefrom, 3 to 8 cells are arranged in the axial direction of the stent per 10 mm of the length of the stent, and the ratio of the length (6L) of the cell in the axial direction of the stent and the length (5L) of the connector portion in the axial direction of the stent is determined such that on the basis that when the length of the cell in the axial direction of

Abstract: The present invention relates to a device for detecting a position and an orientation of an insertion portion of a medical insertion tool which is inserted inside a body cavity, from the outside, and a detecting method therefor. An object of the present invention can achieve a downsized and lightweight insertion portion so as to be smoothly and easily insertable into even a narrow body cavity such as a blood vessel inside a skull, without having a bad influence on a vital tissue. Moreover, another object thereof is to make it possible to detect the three-dimensional position and orientation of the insertion tool very accurately while minimizing a noise. According to the present invention, a permanent magnet or a ferromagnetic body 4 is attached to an insertion portion 2 of a catheter 1 as an example of the medical insertion tool, which is inserted into the body cavity.