JP5610832B2

JP5610832B2 - Stent

Info

Publication number: JP5610832B2
Application number: JP2010103210A
Authority: JP
Inventors: 啓吾 ▲柳▼島; 滋青沼
Original assignee: Takashima Sangyo KK
Current assignee: Takashima Sangyo KK
Priority date: 2010-04-28
Filing date: 2010-04-28
Publication date: 2014-10-22
Anticipated expiration: 2030-04-28
Also published as: JP2011229714A

Description

本発明は、血管、気管、大腸あるいは胆管等の人体内の管状部分を内側から広げるためのステントに関する。 The present invention relates to a stent for expanding a tubular portion in a human body such as a blood vessel, trachea, large intestine or bile duct from the inside.

従来、血管等の人体内の管状部分を内側から広げるためのステントが広く利用されている。この種のステントとして、人体内に配置されるステントの位置決めや位置確認をＸ線等の放射線を用いて行うために、金やプラチナ等の放射線不透過材料で形成されたマーカが固定されているステントが知られている（たとえば、特許文献１参照）。特許文献１に記載のステントでは、円筒状の内周面を有するマーカの配置孔がマーカの固定部分を貫通するように形成されている。この配置孔の両端部には、面取り部が形成されており、この面取り部によって、配置孔に固定されるマーカの抜け落ちが防止されている。 2. Description of the Related Art Conventionally, stents for expanding a tubular portion in a human body such as a blood vessel from the inside are widely used. As a stent of this type, a marker made of a radiopaque material such as gold or platinum is fixed in order to perform positioning and position confirmation of the stent disposed in the human body using radiation such as X-rays. A stent is known (see, for example, Patent Document 1). In the stent described in Patent Document 1, a marker arrangement hole having a cylindrical inner peripheral surface is formed so as to penetrate the fixed portion of the marker. A chamfered portion is formed at both ends of the arrangement hole, and the chamfered portion prevents the marker fixed to the arrangement hole from falling off.

特許第４２９２７１０号公報（段落０１７４、図３２等参照）Japanese Patent No. 4292710 (see paragraph 0174, FIG. 32, etc.)

上述のように、マーカは、人体内に配置されるステントの位置決めやステントの位置確認を放射線を用いて行うために固定されるものであるため、検出されやすくなっていることが好ましい。一方で、マーカに用いられる放射線不透過材料は、金やプラチナ等の高価な材料であるため、ステントのコストを低減するためには、放射線不透過材料の使用量を減らすことが好ましい。 As described above, since the marker is fixed to perform positioning of the stent disposed in the human body and confirmation of the position of the stent using radiation, it is preferable that the marker be easily detected. On the other hand, since the radiopaque material used for the marker is an expensive material such as gold or platinum, it is preferable to reduce the amount of the radiopaque material used in order to reduce the cost of the stent.

そこで、本発明の課題は、マーカを構成する放射線不透過材料の使用量を減らしても検出されやすいマーカを有するステントを提供することにある。 Then, the subject of this invention is providing the stent which has a marker which is easy to detect even if the usage-amount of the radiopaque material which comprises a marker is reduced.

上記の課題を解決するため、本発明のステントは、人体内の管状部分を内側から広げるためのステントにおいて、放射線不透過性材料で形成されたマーカと、マーカが固定されるマーカ固定部とを備え、マーカ固定部には、マーカが配置される配置孔がマーカ固定部の厚さ方向に貫通するように形成され、配置孔の周方向における配置孔の少なくとも一部には、配置孔の径方向内側に向かって突出する凸部が形成され、マーカ固定部の厚さ方向における凸部の断面形状は、マーカ固定部の厚さ方向におけるマーカ固定部の一方の表面からマーカ固定部の厚さ方向におけるマーカ固定部の中間部に向かうにしたがって配置孔の径方向内側に傾斜する第１傾斜辺と、マーカ固定部の厚さ方向におけるマーカ固定部の他方の表面からマーカ固定部の中間部に向かうにしたがって配置孔の径方向内側に傾斜する第２傾斜辺とを有する略三角形状、または、一方の表面からマーカ固定部の厚さ方向における一方の表面寄りの第１の中間位置に向かうにしたがって配置孔の径方向内側に傾斜する第３傾斜辺と、他方の表面からマーカ固定部の厚さ方向における他方の表面寄りの第２の中間位置に向かうにしたがって配置孔の径方向内側に傾斜する第４傾斜辺と、第１の中間位置と第２の中間位置とを結ぶ凸曲線とを有する略山形状、あるいは、一方の表面と他方の表面とを結ぶ凸曲線状に形成され、マーカは、配置孔に充填されるとともに、マーカは、一方の表面および他方の表面よりもマーカ固定部の厚さ方向の外側へはみ出すはみ出し部を備えることを特徴とする。 In order to solve the above problems, a stent according to the present invention is a stent for expanding a tubular portion in a human body from the inside, and includes a marker formed of a radiopaque material and a marker fixing portion to which the marker is fixed. The marker fixing part is formed so that the arrangement hole in which the marker is arranged penetrates in the thickness direction of the marker fixing part, and at least part of the arrangement hole in the circumferential direction of the arrangement hole has a diameter of the arrangement hole. A convex portion protruding inward in the direction is formed, and the cross-sectional shape of the convex portion in the thickness direction of the marker fixing portion is the thickness of the marker fixing portion from one surface of the marker fixing portion in the thickness direction of the marker fixing portion. A first inclined side that is inclined inward in the radial direction of the arrangement hole as it goes toward an intermediate portion of the marker fixing portion in the direction, and the marker fixing portion from the other surface of the marker fixing portion in the thickness direction of the marker fixing portion. A substantially triangular shape having a second inclined side inclined inward in the radial direction of the arrangement hole as it goes to the intermediate portion, or a first intermediate position closer to one surface in the thickness direction of the marker fixing portion from one surface The third inclined side that inclines inward in the radial direction of the arrangement hole as it goes to the radial direction of the arrangement hole as it goes from the other surface to the second intermediate position near the other surface in the thickness direction of the marker fixing portion Formed in a substantially mountain shape having a fourth inclined side inclined inward and a convex curve connecting the first intermediate position and the second intermediate position, or a convex curve shape connecting one surface and the other surface The marker is filled in the arrangement hole, and the marker includes a protruding portion that protrudes outside the one surface and the other surface in the thickness direction of the marker fixing portion .

本発明のステントでは、マーカが配置される配置孔の周方向における配置孔の少なくとも一部には、配置孔の径方向内側に向かって突出する凸部が形成されている。そのため、配置孔に配置されるマーカの体積を凸部の分だけ減らすことができ、マーカを構成する放射線不透過材料の使用量を減らすことができる。また、本発明では、マーカ固定部の厚さ方向における凸部の断面形状は、マーカ固定部の厚さ方向におけるマーカ固定部の一方の表面からマーカ固定部の中間部に向かうにしたがって配置孔の径方向内側に傾斜する第１傾斜辺と、マーカ固定部の厚さ方向におけるマーカ固定部の他方の表面からマーカ固定部の中間部に向かうにしたがって配置孔の径方向内側に傾斜する第２傾斜辺とを有する略三角形状、または、一方の表面からマーカ固定部の厚さ方向における一方の表面寄りの第１の中間位置に向かうにしたがって配置孔の径方向内側に傾斜する第３傾斜辺と、他方の表面からマーカ固定部の厚さ方向における他方の表面寄りの第２の中間位置に向かうにしたがって配置孔の径方向内側に傾斜する第４傾斜辺と、第１の中間位置と第２の中間位置とを結ぶ凸曲線とを有する略山形状、あるいは、一方の表面と他方の表面とを結ぶ凸曲線状に形成されている。そのため、マーカ固定部の一方の表面および他方の表面における配置孔の開口部の径を比較的大きくすることが可能になる。したがって、配置孔に配置されるマーカの体積を減らしても、マーカ固定部の一方の表面および他方の表面でのマーカの表面積を大きくすることが可能になる。その結果、本発明では、マーカを構成する放射線不透過材料の使用量を減らしても、マーカは検出されやすくなる。 In the stent of the present invention, at least a part of the arrangement hole in the circumferential direction of the arrangement hole in which the marker is arranged is formed with a convex portion that protrudes radially inward of the arrangement hole. Therefore, the volume of the marker arranged in the arrangement hole can be reduced by the amount of the convex portion, and the amount of the radiopaque material constituting the marker can be reduced. Further, in the present invention, the cross-sectional shape of the convex portion in the thickness direction of the marker fixing portion is such that the arrangement hole is arranged from one surface of the marker fixing portion in the thickness direction of the marker fixing portion toward the middle portion of the marker fixing portion. A first inclined side inclined inward in the radial direction and a second inclination inclined inward in the radial direction of the arrangement hole from the other surface of the marker fixing portion in the thickness direction of the marker fixing portion toward the intermediate portion of the marker fixing portion A substantially triangular shape having a side, or a third inclined side that is inclined inward in the radial direction of the arrangement hole from one surface toward the first intermediate position closer to one surface in the thickness direction of the marker fixing portion. A fourth inclined side that inclines radially inward from the other surface toward the second intermediate position closer to the other surface in the thickness direction of the marker fixing portion, the first intermediate position, and the second of Substantially mountain shape and a convex curve connecting and between positions, or are formed in a convex curved shape connecting the one surface and the other surface. Therefore, the diameter of the opening portion of the arrangement hole on one surface and the other surface of the marker fixing portion can be made relatively large. Therefore, even if the volume of the marker arranged in the arrangement hole is reduced, the surface area of the marker on one surface and the other surface of the marker fixing portion can be increased. As a result, in the present invention, the marker is easily detected even if the amount of the radiopaque material constituting the marker is reduced.

また、本発明では、マーカ固定部の一方の表面および他方の表面における配置孔の開口部の径を比較的大きくすることが可能になるため、配置孔へのマーカの配置作業や固定作業が容易になる。さらに、本発明では、マーカ固定部の厚さ方向における凸部の断面形状が略三角形状、または、略山形状、あるいは、凸曲線状に形成されているため、配置孔からのマーカの抜け落ちを防止することが可能になる。 Further, in the present invention, since the diameter of the opening portion of the arrangement hole on one surface and the other surface of the marker fixing portion can be made relatively large, it is easy to arrange and fix the marker to the arrangement hole. become. Furthermore, in the present invention, since the cross-sectional shape of the convex portion in the thickness direction of the marker fixing portion is formed in a substantially triangular shape, a substantially mountain shape, or a convex curve shape, it is possible to prevent the marker from dropping from the arrangement hole. It becomes possible to prevent.

本発明において、配置孔は、マーカ固定部の厚さ方向から見たときの形状が略円形状となるように形成され、凸部は、マーカの形状が略鼓状になるように、配置孔の周方向の全域に形成されていることが好ましい。このように構成すると、マーカを構成する放射線不透過材料の使用量を効果的に減らすことができる。また、このように構成すると、配置孔からマーカがより抜け落ちにくくなるため、配置孔からのマーカの抜け落ちを確実に防止することが可能になる。 In the present invention, the arrangement hole is formed so that the shape when viewed from the thickness direction of the marker fixing portion is a substantially circular shape, and the convex portion is arranged so that the shape of the marker is a substantially drum shape. It is preferable that it is formed in the whole area of the circumferential direction. If comprised in this way, the usage-amount of the radiopaque material which comprises a marker can be reduced effectively. Further, with this configuration, the marker is more difficult to drop out from the arrangement hole, and thus it is possible to reliably prevent the marker from dropping out from the arrangement hole.

また、上記の課題を解決するため、本発明のステントは、人体内の管状部分を内側から広げるためのステントにおいて、放射線不透過性材料で形成されるマーカと、マーカが固定されるマーカ固定部とを備え、マーカ固定部には、マーカが配置される配置孔がマーカ固定部の厚さ方向に貫通するように形成され、配置孔の周方向における配置孔の少なくとも一部には、配置孔の径方向外側に向かって窪む凹部が形成され、マーカ固定部の厚さ方向における凹部の断面形状は、マーカ固定部の厚さ方向におけるマーカ固定部の一方の表面からマーカ固定部の厚さ方向におけるマーカ固定部の中間部に向かうにしたがって配置孔の径方向外側に傾斜する第５傾斜辺と、マーカ固定部の厚さ方向におけるマーカ固定部の他方の表面からマーカ固定部の中間部に向かうにしたがって配置孔の径方向外側に傾斜する第６傾斜辺とを有する略三角形状、または、一方の表面からマーカ固定部の厚さ方向における一方の表面寄りの第１の中間位置に向かうにしたがって配置孔の径方向外側に傾斜する第７傾斜辺と、他方の表面からマーカ固定部の厚さ方向における他方の表面寄りの第２の中間位置に向かうにしたがって配置孔の径方向外側に傾斜する第８傾斜辺と、第１の中間位置と第２の中間位置とを結ぶ凹曲線とを有する略山形状、あるいは、一方の表面と他方の表面とを結ぶ凹曲線状に形成され、マーカは、配置孔に充填されるとともに、マーカは、一方の表面および他方の表面よりもマーカ固定部の厚さ方向の外側へはみ出すはみ出し部を備えることを特徴とする。 Moreover, in order to solve said subject, the stent of this invention is a stent for expanding the tubular part in a human body from the inside, The marker formed from a radiopaque material, The marker fixing | fixed part to which a marker is fixed The marker fixing part is formed so that the arrangement hole in which the marker is arranged penetrates in the thickness direction of the marker fixing part, and at least part of the arrangement hole in the circumferential direction of the arrangement hole has an arrangement hole Is formed in a thickness direction of the marker fixing portion from one surface of the marker fixing portion in the thickness direction of the marker fixing portion. A marker-fixing portion from the other surface of the marker-fixing portion in the thickness direction of the marker fixing portion and a fifth inclined side that inclines radially outward of the arrangement hole toward the middle portion of the marker-fixing portion in the direction A substantially triangular shape having a sixth inclined side inclined outward in the radial direction of the arrangement hole toward the intermediate portion, or a first intermediate position closer to one surface in the thickness direction of the marker fixing portion from one surface The seventh inclined side that inclines outward in the radial direction of the arrangement hole as it goes to the radial direction of the arrangement hole as it goes from the other surface to the second intermediate position near the other surface in the thickness direction of the marker fixing portion Formed in an approximately mountain shape having an eighth inclined side inclined outward and a concave curve connecting the first intermediate position and the second intermediate position, or a concave curve shape connecting one surface and the other surface. The marker is filled in the arrangement hole, and the marker includes a protruding portion that protrudes outside the one surface and the other surface in the thickness direction of the marker fixing portion .

本発明のステントでは、マーカが配置される配置孔の周方向における配置孔の少なくとも一部には、配置孔の径方向外側に向かって窪む凹部が形成され、マーカ固定部の厚さ方向における凹部の断面形状は、マーカ固定部の厚さ方向におけるマーカ固定部の一方の表面からマーカ固定部の中間部に向かうにしたがって配置孔の径方向外側に傾斜する第５傾斜辺と、マーカ固定部の厚さ方向におけるマーカ固定部の他方の表面からマーカ固定部の中間部に向かうにしたがって配置孔の径方向外側に傾斜する第６傾斜辺とを有する略三角形状、または、一方の表面からマーカ固定部の厚さ方向における一方の表面寄りの第１の中間位置に向かうにしたがって配置孔の径方向外側に傾斜する第７傾斜辺と、他方の表面からマーカ固定部の厚さ方向における他方の表面寄りの第２の中間位置に向かうにしたがって配置孔の径方向外側に傾斜する第８傾斜辺と、第１の中間位置と第２の中間位置とを結ぶ凹曲線とを有する略山形状、あるいは、一方の表面と他方の表面とを結ぶ凹曲線状に形成されている。そのため、マーカ固定部の一方の表面および他方の表面における配置孔の開口部の径を小さくし、かつ、マーカ固定部の厚さ方向におけるマーカ固定部の中間部における配置孔の径を大きくすることが可能になる。したがって、配置孔の開口部の径を小さくした分だけ配置孔に配置されるマーカの体積を減らすことができ、マーカを構成する放射線不透過材料の使用量を減らすことができる。また、マーカ固定部の中間部における配置孔の径を大きくすることが可能になるため、マーカ固定部の中間部におけるマーカの断面積を大きくすることが可能になる。その結果、本発明では、マーカを構成する放射線不透過材料の使用量を減らしても、マーカは検出されやすくなる。 In the stent of the present invention, at least a part of the arrangement hole in the circumferential direction of the arrangement hole in which the marker is arranged is formed with a concave portion that is recessed outward in the radial direction of the arrangement hole, and in the thickness direction of the marker fixing portion. The cross-sectional shape of the recess includes a fifth inclined side that inclines radially outward of the arrangement hole from one surface of the marker fixing portion in the thickness direction of the marker fixing portion toward the middle portion of the marker fixing portion, and the marker fixing portion. A substantially triangular shape having a sixth inclined side that inclines radially outward of the arrangement hole from the other surface of the marker fixing portion in the thickness direction toward the middle portion of the marker fixing portion, or a marker from one surface A seventh inclined side that inclines radially outward of the arrangement hole toward the first intermediate position near one surface in the thickness direction of the fixing portion, and the thickness direction of the marker fixing portion from the other surface And an eighth inclined side that inclines radially outward of the arrangement hole toward the second intermediate position closer to the other surface, and a concave curve that connects the first intermediate position and the second intermediate position. It is formed in a mountain shape or a concave curve connecting one surface and the other surface. Therefore, reduce the diameter of the opening portion of the arrangement hole on one surface and the other surface of the marker fixing portion, and increase the diameter of the arrangement hole in the middle portion of the marker fixing portion in the thickness direction of the marker fixing portion. Is possible. Therefore, the volume of the marker arranged in the arrangement hole can be reduced by the amount that the diameter of the opening of the arrangement hole is reduced, and the amount of the radiopaque material constituting the marker can be reduced. In addition, since the diameter of the arrangement hole in the intermediate portion of the marker fixing portion can be increased, the cross-sectional area of the marker in the intermediate portion of the marker fixing portion can be increased. As a result, in the present invention, the marker is easily detected even if the amount of the radiopaque material constituting the marker is reduced.

また、本発明では、マーカ固定部の厚さ方向における凹部の断面形状が略三角形状、または、略山形状、あるいは、凸曲線状に形成されているため、配置孔からのマーカの抜け落ちを防止することが可能になる。 Further, in the present invention, since the cross-sectional shape of the concave portion in the thickness direction of the marker fixing portion is formed in a substantially triangular shape, a substantially mountain shape, or a convex curve shape, the marker is prevented from falling off from the arrangement hole. It becomes possible to do.

本発明において、配置孔は、マーカ固定部の厚さ方向から見たときの形状が略円形状となるように形成され、凹部は、マーカ固定部の厚さ方向におけるマーカの断面形状が略六角形状または略長円形状あるいは略楕円形状となるように、配置孔の周方向の全域に形成されていることが好ましい。このように構成すると、マーカを構成する放射線不透過材料の使用量を効果的に減らすことができる。また、このように構成すると、配置孔からマーカがより抜け落ちにくくなるため、配置孔からのマーカの抜け落ちを確実に防止することが可能になる。 In the present invention, the arrangement hole is formed so that the shape when viewed from the thickness direction of the marker fixing portion is a substantially circular shape, and the recess has a substantially hexagonal cross-sectional shape in the thickness direction of the marker fixing portion. It is preferably formed in the entire region in the circumferential direction of the arrangement hole so as to have a shape, a substantially oval shape, or a substantially oval shape. If comprised in this way, the usage-amount of the radiopaque material which comprises a marker can be reduced effectively. Further, with this configuration, the marker is more difficult to drop out from the arrangement hole, and thus it is possible to reliably prevent the marker from dropping out from the arrangement hole.

本発明において、配置孔は、管状部材をレーザ加工してステントを製造するためのレーザ加工装置であって、管状部材の中心軸を第１軸とし、第１軸に直交する所定の軸を第２軸としたときに、管状部材を第１軸回りに回転させる第１回転機構と、管状部材に向かってレーザを照射するレーザヘッドを第２軸回りに回転させる第２回転機構と、レーザヘッドに対して管状部材を互いに直交する３方向へ相対移動させる移動機構とを有するレーザ加工装置によって形成されることが好ましい。すなわち、配置孔は、５軸レーザ加工装置によって形成されることが好ましい。この場合には、配置孔をレーザ加工で形成する際に、管状部材を把持する把持機構が管状部材を把持し直さなくても、凸部または凹部を有する配置孔を形成することが可能になる。したがって、配置孔の加工精度を高めることが可能になる。また、配置孔の加工工程が容易になる。 In the present invention, the arrangement hole is a laser processing apparatus for manufacturing a stent by laser processing a tubular member, wherein the central axis of the tubular member is a first axis, and a predetermined axis orthogonal to the first axis is a first axis. A first rotation mechanism that rotates the tubular member around the first axis, the second rotation mechanism that rotates the laser head that irradiates the laser toward the tubular member around the second axis, and the laser head. On the other hand, it is preferably formed by a laser processing apparatus having a moving mechanism that relatively moves the tubular member in three directions orthogonal to each other. That is, the arrangement hole is preferably formed by a 5-axis laser processing apparatus. In this case, when the arrangement hole is formed by laser processing, it is possible to form the arrangement hole having the convex portion or the concave portion without the gripping mechanism that holds the tubular member re-gripping the tubular member. . Therefore, it is possible to increase the processing accuracy of the arrangement hole. Further, the processing process of the arrangement hole is facilitated.

以上のように、本発明のステントでは、マーカを構成する放射線不透過材料の使用量を減らしても、マーカは検出されやすくなる。 As described above, in the stent of the present invention, the marker is easily detected even if the amount of the radiopaque material constituting the marker is reduced.

本発明の実施の形態にかかるステントの概略斜視図である。1 is a schematic perspective view of a stent according to an embodiment of the present invention. 図１のＥ部の拡大図である。It is an enlarged view of the E section of FIG. （Ａ）は図２のＦ−Ｆ断面の断面図であり、（Ｂ）は（Ａ）に示す配置孔にマーカを取り付けた状態を示す断面図である。(A) is sectional drawing of the FF cross section of FIG. 2, (B) is sectional drawing which shows the state which attached the marker to the arrangement | positioning hole shown to (A). 図１に示すステントを加工するためのレーザ加工装置の斜視図である。It is a perspective view of the laser processing apparatus for processing the stent shown in FIG. （Ａ）は本発明の変形例１にかかる配置孔の断面図であり、（Ｂ）は（Ａ）の配置孔にマーカを取り付けた状態を示す断面図である。(A) is sectional drawing of the arrangement | positioning hole concerning the modification 1 of this invention, (B) is sectional drawing which shows the state which attached the marker to the arrangement | positioning hole of (A). （Ａ）は本発明の変形例２にかかる配置孔の断面図であり、（Ｂ）は（Ａ）の配置孔にマーカを取り付けた状態を示す断面図である。(A) is sectional drawing of the arrangement | positioning hole concerning the modification 2 of this invention, (B) is sectional drawing which shows the state which attached the marker to the arrangement | positioning hole of (A). （Ａ）は本発明の変形例３にかかる配置孔の断面図であり、（Ｂ）は（Ａ）の配置孔にマーカを取り付けた状態を示す断面図である。(A) is sectional drawing of the arrangement | positioning hole concerning the modification 3 of this invention, (B) is sectional drawing which shows the state which attached the marker to the arrangement | positioning hole of (A). 本発明の変形例４にかかる配置孔にマーカを取り付けた状態を示す断面図である。It is sectional drawing which shows the state which attached the marker to the arrangement | positioning hole concerning the modification 4 of this invention. （Ａ）は本発明の変形例５にかかる配置孔の断面図であり、（Ｂ）は（Ａ）の配置孔にマーカを取り付けた状態を示す断面図である。(A) is sectional drawing of the arrangement | positioning hole concerning the modification 5 of this invention, (B) is sectional drawing which shows the state which attached the marker to the arrangement | positioning hole of (A). 本発明の他の実施の形態にかかる配置孔を示す平面図である。It is a top view which shows the arrangement | positioning hole concerning other embodiment of this invention. 本発明の他の実施の形態にかかる配置孔の断面図である。It is sectional drawing of the arrangement | positioning hole concerning other embodiment of this invention.

以下、図面を参照しながら、本発明の実施の形態を説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

（ステントの構成）
図１は、本発明の実施の形態にかかるステント１の概略斜視図である。図２は、図１のＥ部の拡大図である。図３（Ａ）は、図２のＦ−Ｆ断面の断面図であり、図３（Ｂ）は、図３（Ａ）に示す配置孔３ａにマーカ２を取り付けた状態を示す断面図である。なお、図２では、マーカ２の図示を省略している。 (Stent structure)
FIG. 1 is a schematic perspective view of a stent 1 according to an embodiment of the present invention. FIG. 2 is an enlarged view of a portion E in FIG. 3A is a cross-sectional view of the FF cross section of FIG. 2, and FIG. 3B is a cross-sectional view showing a state where the marker 2 is attached to the arrangement hole 3a shown in FIG. 3A. . In addition, illustration of the marker 2 is abbreviate | omitted in FIG.

ステント１は、血管、気管、大腸あるいは胆管等の人体内の管状部分の内側に配置されて、管状部分を内側から広げるためのものである。本形態のステント１は、たとえば、胆管の内部に配置される体内留置型のステントであり、全体として略円筒状に形成されている。このステント１は、たとえば、ニッケルチタン合金で形成されている。また、ステント１の側面は、図１に示すように略網目状に形成されている。なお、ステント１は、ステンレス鋼等の他の材料で形成されても良い。 The stent 1 is arranged inside a tubular portion in a human body such as a blood vessel, a trachea, a large intestine, or a bile duct, and extends the tubular portion from the inside. The stent 1 of this embodiment is, for example, an indwelling stent disposed inside a bile duct and is formed in a substantially cylindrical shape as a whole. The stent 1 is made of, for example, a nickel titanium alloy. Further, the side surface of the stent 1 is formed in a substantially mesh shape as shown in FIG. The stent 1 may be formed of other materials such as stainless steel.

Ｘ線等の放射線を用いて人体内に配置されるステント１の位置決めや位置確認を行うため、ステント１には、放射線を透過しない放射線不透過材料で形成されるマーカ２が固定されている。マーカ２は、たとえば、金、白金、パラジウム、タンタルあるいはタングステン等によって形成されている。このマーカ２は、たとえば、ステント１の軸方向の端部に形成されるマーカ固定部３に固定されている。なお、マーカ固定部３は、ステント１の軸方向における中間位置に形成されても良い。 In order to perform positioning and position confirmation of the stent 1 disposed in the human body using radiation such as X-rays, a marker 2 made of a radiopaque material that does not transmit radiation is fixed to the stent 1. The marker 2 is made of, for example, gold, platinum, palladium, tantalum or tungsten. For example, the marker 2 is fixed to a marker fixing portion 3 formed at an end portion of the stent 1 in the axial direction. The marker fixing part 3 may be formed at an intermediate position in the axial direction of the stent 1.

図２、図３に示すように、マーカ固定部３には、マーカ２が配置される配置孔３ａが形成されている。配置孔３ａは、マーカ固定部３の厚さ方向となるＶ方向でマーカ固定部３を貫通するように形成されている。マーカ２は、カシメや溶接等によって配置孔３ａに固定されており、配置孔３ａには、マーカ２が充填されている。また、配置孔３ａは、Ｖ方向から見たときの形状が略円形状となるように形成されている。配置孔３ａには、配置孔３ａの径方向内側に向かって突出する凸部３ｂが形成されている。 As shown in FIGS. 2 and 3, the marker fixing portion 3 is formed with an arrangement hole 3 a in which the marker 2 is arranged. The arrangement hole 3 a is formed so as to penetrate the marker fixing part 3 in the V direction which is the thickness direction of the marker fixing part 3. The marker 2 is fixed to the arrangement hole 3a by caulking, welding, or the like, and the arrangement hole 3a is filled with the marker 2. Moreover, the arrangement | positioning hole 3a is formed so that the shape when it sees from a V direction may become a substantially circular shape. The arrangement hole 3a is formed with a protrusion 3b that protrudes radially inward of the arrangement hole 3a.

本形態の凸部３ｂは、配置孔３ａの周方向の全域に形成されている。また、凸部３ｂは、配置孔３ａに充填されるマーカ２の形状が略鼓状となるように（具体的には、その側面が三角形状に窪む略鼓状となるように）形成されている。すなわち、図３（Ａ）に示すように、Ｖ方向におけるマーカ固定部３の中間部３ｃからＶ方向におけるマーカ固定部３の一方の表面３ｄに向かって広がる円錐台状の円錐台面３ｅと、中間部３ｃからＶ方向におけるマーカ固定部３の他方の表面３ｆに向かって広がる円錐台状の円錐台面３ｇとによって配置孔３ａの内周面が構成されるように、凸部３ｂが形成されている。 The convex part 3b of this form is formed in the whole region of the circumferential direction of the arrangement | positioning hole 3a. The convex portion 3b is formed so that the marker 2 filled in the arrangement hole 3a has a substantially drum shape (specifically, the side surface has a substantially drum shape with a triangular recess). ing. That is, as shown in FIG. 3A, a truncated cone-shaped truncated cone surface 3e extending from an intermediate portion 3c of the marker fixing portion 3 in the V direction toward one surface 3d of the marker fixing portion 3 in the V direction, The convex portion 3b is formed so that the inner peripheral surface of the arrangement hole 3a is configured by the truncated cone-shaped truncated cone surface 3g extending from the portion 3c toward the other surface 3f of the marker fixing portion 3 in the V direction. .

すなわち、マーカ固定部３の厚さ方向（Ｖ方向）における凸部３ｂの断面形状（具体的には、配置孔３ａの中心を通過する断面における凸部３ｂの形状）は、一方の表面３ｄから中間部３ｃに向かうにしたがって配置孔３ａの径方向内側に傾斜する第１傾斜辺３ｈと、他方の表面３ｆから中間部３ｃに向かうにしたがって配置孔３ａの径方向内側に傾斜する第２傾斜辺３ｊとを有する略三角形状に形成されている。本形態では、Ｖ方向における凸部３ｂの断面形状は、第１傾斜辺３ｈの長さと第２傾斜辺３ｊの長さとが等しい略二等辺三角形状となっている。なお、第１傾斜辺３ｈの長さと第２傾斜辺３ｊの長さとは等しくなくても良い。 That is, the cross-sectional shape of the convex portion 3b in the thickness direction (V direction) of the marker fixing portion 3 (specifically, the shape of the convex portion 3b in the cross section passing through the center of the arrangement hole 3a) is from the one surface 3d. A first inclined side 3h that is inclined inward in the radial direction of the arrangement hole 3a toward the intermediate part 3c, and a second inclined side that is inclined inward in the radial direction of the arrangement hole 3a from the other surface 3f toward the intermediate part 3c. 3j and a substantially triangular shape. In this embodiment, the cross-sectional shape of the convex portion 3b in the V direction is a substantially isosceles triangle shape in which the length of the first inclined side 3h is equal to the length of the second inclined side 3j. The length of the first inclined side 3h may not be equal to the length of the second inclined side 3j.

（ステントを加工するためのレーザ加工装置の概略構成）
図４は、図１に示すステント１を加工するためのレーザ加工装置２０の斜視図である。以下の説明では、図４に示すように、互いに直交する３方向のそれぞれをＸ方向、Ｙ方向およびＺ方向とする。なお、本形態では、Ｚ方向が上下方向と一致する。 (Schematic configuration of a laser processing apparatus for processing a stent)
FIG. 4 is a perspective view of a laser processing apparatus 20 for processing the stent 1 shown in FIG. In the following description, as shown in FIG. 4, each of the three directions orthogonal to each other is defined as an X direction, a Y direction, and a Z direction. In the present embodiment, the Z direction coincides with the vertical direction.

ステント１は、たとえば、図４に示すレーザ加工装置２０で加工される。レーザ加工装置２０は、所定の加工工程を経た後にステント１となる管状部材２１を把持する把持機構２２と、管状部材２１に向かってレーザを照射するレーザヘッド２３とを備えている。管状部材２１は、長尺状に形成されており、その軸方向とＸ方向とが略一致するように配置されている。 The stent 1 is processed by, for example, a laser processing apparatus 20 shown in FIG. The laser processing apparatus 20 includes a gripping mechanism 22 that grips a tubular member 21 that becomes the stent 1 after a predetermined processing step, and a laser head 23 that irradiates a laser toward the tubular member 21. The tubular member 21 is formed in an elongated shape, and is arranged so that the axial direction thereof substantially coincides with the X direction.

また、レーザ加工装置２０は、把持機構２２をＸ方向へ移動させる第１移動機構２４と、把持機構２２をＹ方向へ移動させる第２移動機構２５と、レーザヘッド２３をＺ方向へ移動させる（上下動させる）第３移動機構２６とを備えている。第１移動機構２４、第２移動機構２５および第３移動機構２６は、たとえば、回転型のモータと、モータの出力軸に連結される送りネジと、送りネジに螺合するナット部材等を備えている。あるいは、第１移動機構２４、第２移動機構２５および第３移動機構２６は、たとえば、リニアモータである。 Further, the laser processing apparatus 20 moves the first moving mechanism 24 that moves the gripping mechanism 22 in the X direction, the second moving mechanism 25 that moves the gripping mechanism 22 in the Y direction, and the laser head 23 in the Z direction ( And a third moving mechanism 26 (moving up and down). The first moving mechanism 24, the second moving mechanism 25, and the third moving mechanism 26 include, for example, a rotary motor, a feed screw connected to the output shaft of the motor, a nut member that is screwed to the feed screw, and the like. ing. Alternatively, the first moving mechanism 24, the second moving mechanism 25, and the third moving mechanism 26 are, for example, linear motors.

把持機構２２は、管状部材２１の先端側を回転可能に把持する先端側把持部２７と、管状部材２１の基端側を回転可能に把持する基端側把持部２８とを備えている。先端側把持部２７は、管状部材２１の先端側を把持するチャックと、Ｘ方向を回転軸の方向としてチャックを回転させる（すなわち、θ１方向にチャックを回転させる）回転機構とを備えている。基端側把持部２８は、管状部材２１の後端を把持するノズルと、Ｘ方向を回転軸の方向としてノズルを回転させる（すなわち、θ１方向にノズルを回転させる）回転機構とを備えている。この基端側把持部２８は、先端側把持部２７に対してＸ方向に相対移動可能となっている。 The gripping mechanism 22 includes a distal end side grip portion 27 that grips the distal end side of the tubular member 21 in a rotatable manner, and a proximal end side grip portion 28 that grips the proximal end side of the tubular member 21 in a rotatable manner. The distal end side gripping portion 27 includes a chuck that grips the distal end side of the tubular member 21 and a rotation mechanism that rotates the chuck with the X direction as the direction of the rotation axis (that is, rotates the chuck in the θ1 direction). The proximal-side holding portion 28 includes a nozzle that holds the rear end of the tubular member 21 and a rotation mechanism that rotates the nozzle with the X direction as the direction of the rotation axis (that is, rotates the nozzle in the θ1 direction). . The proximal end gripping portion 28 can move relative to the distal end side gripping portion 27 in the X direction.

把持機構２２は、支持板２９に載置されている。支持板２９は、第１移動機構２４によってＸ方向へ移動可能となっている。第１移動機構２４は、支持板３０に載置されている。支持板３０は、第２移動機構２５によって、Ｙ方向へ移動可能となっている。 The gripping mechanism 22 is placed on the support plate 29. The support plate 29 can be moved in the X direction by the first moving mechanism 24. The first moving mechanism 24 is placed on the support plate 30. The support plate 30 can be moved in the Y direction by the second moving mechanism 25.

レーザヘッド２３は、レーザの照射口が下側を向くように、支持板３１に取り付けられている。支持板３１には、Ｙ方向を出力軸の軸方向として配置されるモータ３２が連結されており、レーザヘッド２３は、支持板３１とともに、Ｙ方向を回転軸の方向として回転可能となっている。すなわち、レーザヘッド２３は、θ２方向に回転可能となっている。モータ３２は、支持板３３に取り付けられている。支持板３３は、第３移動機構２６によってＺ方向へ移動可能となっている。 The laser head 23 is attached to the support plate 31 so that the laser irradiation port faces downward. A motor 32 is connected to the support plate 31 with the Y direction as the axial direction of the output shaft, and the laser head 23 can rotate with the support plate 31 with the Y direction as the direction of the rotation axis. . That is, the laser head 23 is rotatable in the θ2 direction. The motor 32 is attached to the support plate 33. The support plate 33 can be moved in the Z direction by the third moving mechanism 26.

このように、レーザ加工装置２０は、レーザヘッド２３に対して管状部材２１を、Ｘ、Ｙ、Ｚ、θ１およびθ２の５軸方向へ相対移動可能な５軸レーザ加工装置である。ステント１の側面の網目形状や配置孔３ａは、管状部材２１をＸ方向やＹ方向へ送りながらθ１方向へ回転させるとともに、管状部材２１にレーザを照射するレーザヘッド２３をＺ方向へ送りながらθ２方向へ回転させることで形成される。なお、本形態では、管状部材２１の中心軸が第１軸であり、モータ３２の中心軸が第２軸である。また、先端側把持部２７が有する回転機構と基端側把持部２８が有する回転機構とによって、管状部材２１を第１軸回りに回転させる第１回転機構が構成され、モータ３２がレーザヘッド２３を第２軸回りに回転させる第２回転機構となっている。また、第１移動機構２４、第２移動機構２５および第３移動機構２６によって、レーザヘッド２３に対して管状部材２１を互いに直交する３方向へ相対移動させる移動機構が構成されている。 Thus, the laser processing apparatus 20 is a 5-axis laser processing apparatus that can move the tubular member 21 relative to the laser head 23 in the 5-axis directions of X, Y, Z, θ1, and θ2. The mesh shape and the arrangement hole 3a on the side surface of the stent 1 rotate in the θ1 direction while feeding the tubular member 21 in the X direction and the Y direction, and θ2 while feeding the laser head 23 that irradiates the tubular member 21 with laser in the Z direction. It is formed by rotating in the direction. In this embodiment, the central axis of the tubular member 21 is the first axis, and the central axis of the motor 32 is the second axis. The rotation mechanism of the distal end side gripping portion 27 and the rotation mechanism of the proximal end side gripping portion 28 constitute a first rotation mechanism that rotates the tubular member 21 around the first axis, and the motor 32 serves as the laser head 23. This is a second rotation mechanism that rotates the shaft around the second axis. Further, the first moving mechanism 24, the second moving mechanism 25, and the third moving mechanism 26 constitute a moving mechanism that relatively moves the tubular member 21 in three directions orthogonal to each other with respect to the laser head 23.

（本形態の主な効果）
以上説明したように、本形態では、配置孔３ａに、その径方向内側に向かって突出する凸部３ｂが形成されている。そのため、配置孔３ａに充填されるマーカ２の体積を凸部３ｂの分だけ減らすことができ、マーカ２を構成する放射線不透過材料の使用量を減らすことができる。特に本形態では、配置孔３ａの周方向の全域に凸部３ｂが形成されているため、マーカ２を構成する放射線不透過材料の使用量を効果的に減らすことができる。 (Main effects of this form)
As described above, in this embodiment, the arrangement hole 3a is formed with the convex portion 3b that protrudes inward in the radial direction. Therefore, the volume of the marker 2 filled in the arrangement hole 3a can be reduced by the amount of the convex portion 3b, and the usage amount of the radiopaque material constituting the marker 2 can be reduced. In particular, in this embodiment, since the convex portion 3b is formed in the entire circumferential direction of the arrangement hole 3a, the amount of the radiopaque material constituting the marker 2 can be effectively reduced.

また、本形態では、配置孔３ａの内周面は、２個の円錐台面３ｅ、３ｇによって構成されており、凸部３ｂは、配置孔３ａに充填されるマーカ２が略鼓状となるように形成されている。そのため、一方の表面３ｄにおける配置孔３ａの開口部３ｋの径および他方の表面３ｆにおける配置孔３ａの開口部３ｍの径を大きくすることができ、配置孔３ａに充填されるマーカ２の体積を減らしても、一方の表面３ｄおよび他方の表面３ｆでのマーカ２の表面積を大きくすることができる。したがって、本形態では、マーカ２を構成する放射線不透過材料の使用量を減らしても、マーカ２は検出されやすくなる。 Further, in this embodiment, the inner peripheral surface of the arrangement hole 3a is constituted by the two truncated cone surfaces 3e and 3g, and the convex portion 3b is such that the marker 2 filled in the arrangement hole 3a has a substantially drum shape. Is formed. Therefore, the diameter of the opening 3k of the arrangement hole 3a on one surface 3d and the diameter of the opening 3m of the arrangement hole 3a on the other surface 3f can be increased, and the volume of the marker 2 filled in the arrangement hole 3a can be increased. Even if the number is reduced, the surface area of the marker 2 on the one surface 3d and the other surface 3f can be increased. Therefore, in this embodiment, the marker 2 is easily detected even if the amount of the radiopaque material constituting the marker 2 is reduced.

また、本形態では、開口部３ｋ、３ｍの径を大きくすることができるため、配置孔３ａへのマーカ２の配置作業および固定作業が容易になる。また、本形態では、配置孔３ａに充填されるマーカ２が略鼓状となるように凸部３ｂが形成されているため、配置孔３ａからのマーカ２の抜け落ちを防止することが可能になる。特に本形態では、配置孔３ａの周方向の全域に凸部３ｂが形成されているため、配置孔３ａからマーカ２がより抜け落ちにくくなり、配置孔３ａからのマーカ２の抜け落ちを確実に防止することが可能になる。 Moreover, in this form, since the diameter of the opening parts 3k and 3m can be enlarged, the arrangement | positioning work and fixing work of the marker 2 to the arrangement | positioning hole 3a become easy. Further, in this embodiment, since the convex portion 3b is formed so that the marker 2 filled in the arrangement hole 3a has a substantially drum shape, it is possible to prevent the marker 2 from falling out of the arrangement hole 3a. . In particular, in this embodiment, since the convex portion 3b is formed in the entire circumferential direction of the arrangement hole 3a, the marker 2 is more difficult to drop out from the arrangement hole 3a, and the dropout of the marker 2 from the arrangement hole 3a is surely prevented. It becomes possible.

なお、以上の効果をより効果的に得るためには、一方の表面３ｄに対する第１傾斜辺３ｈの傾斜角度α１、および、他方の表面３ｆに対する第２傾斜辺３ｊの傾斜角度α２は、４５°よりも小さくなっていることが好ましい。 In order to obtain the above effect more effectively, the inclination angle α1 of the first inclined side 3h with respect to one surface 3d and the inclination angle α2 of the second inclined side 3j with respect to the other surface 3f are 45 °. It is preferable to be smaller.

本形態では、配置孔３ａは、５軸レーザ加工装置であるレーザ加工装置２０によって形成されている。そのため、配置孔３ａをレーザ加工で形成する際に、把持機構２２が管状部材２１を把持し直さなくても、凸部３ｂを有する配置孔３ａを形成することができる。すなわち、１工程（１チャック）のレーザ加工で凸部３ｂを有する配置孔３ａを形成することができる。したがって、本形態では、配置孔３ａの加工精度を高めることが可能になる。また、配置孔３ａの加工工程が容易になる。 In this embodiment, the arrangement hole 3a is formed by a laser processing apparatus 20 that is a 5-axis laser processing apparatus. Therefore, when forming the arrangement hole 3a by laser processing, the arrangement hole 3a having the convex portion 3b can be formed without the gripping mechanism 22 re-gripping the tubular member 21. That is, the arrangement hole 3a having the convex portion 3b can be formed by laser processing in one step (one chuck). Therefore, in this embodiment, it is possible to increase the processing accuracy of the arrangement hole 3a. Moreover, the process of the arrangement | positioning hole 3a becomes easy.

（配置孔の変形例１）
図５（Ａ）は、本発明の変形例１にかかる配置孔４ａの断面図であり、図５（Ｂ）は、（Ａ）の配置孔４ａにマーカ２を取り付けた状態を示す断面図である。 (Variation 1 of the arrangement hole)
5A is a cross-sectional view of the arrangement hole 4a according to the first modification of the present invention, and FIG. 5B is a cross-sectional view showing a state in which the marker 2 is attached to the arrangement hole 4a of FIG. is there.

マーカ固定部３には、上述した配置孔３ａに代えて、図５に示すように、配置孔４ａが形成されても良い。配置孔４ａは、Ｖ方向から見たときの形状が略円形状となるように形成されている。また、配置孔４ａには、配置孔４ａの径方向内側に向かって突出する凸部４ｂが形成されている。 Instead of the arrangement hole 3a described above, the arrangement hole 4a may be formed in the marker fixing portion 3 as shown in FIG. The arrangement hole 4a is formed so that the shape when viewed from the V direction is substantially circular. Moreover, the convex part 4b which protrudes toward the radial inside of the arrangement | positioning hole 4a is formed in the arrangement | positioning hole 4a.

凸部４ｂは、配置孔４ａの周方向の全域に形成されている。また、凸部４ｂは、配置孔４ａに充填されるマーカ２の形状が略鼓状となるように（具体的には、その側面が略山形状に窪む略鼓状となるように）形成されている。すなわち、図４（Ａ）に示すように、Ｖ方向におけるマーカ固定部３の、一方の表面３ｄ寄りの第１の中間位置４ｐから一方の表面３ｄに向かって広がる円錐台状の円錐台面４ｅと、Ｖ方向におけるマーカ固定部３の、他方の表面３ｆ寄りの第２の中間位置４ｑから他方の表面３ｆに向かって広がる円錐台状の円錐台面４ｇと、円錐台面４ｅと円錐台面４ｇとを繋ぐ凸曲面４ｒとによって配置孔４ａの内周面が構成されるように、凸部４ｂが形成されている。 The convex part 4b is formed in the whole circumferential direction of the arrangement | positioning hole 4a. Further, the convex portion 4b is formed so that the shape of the marker 2 filled in the arrangement hole 4a is substantially drum-shaped (specifically, the side surface thereof is substantially drum-shaped recessed in a substantially mountain shape). Has been. That is, as shown in FIG. 4A, a frustoconical truncated cone surface 4e extending from the first intermediate position 4p near the one surface 3d toward the one surface 3d of the marker fixing portion 3 in the V direction; The frustoconical frustoconical surface 4g extending from the second intermediate position 4q near the other surface 3f of the marker fixing portion 3 in the V direction toward the other surface 3f, and the frustoconical surface 4e and the frustoconical surface 4g are connected. The convex part 4b is formed so that the inner peripheral surface of the arrangement | positioning hole 4a is comprised by the convex curved surface 4r.

すなわち、マーカ固定部３の厚さ方向における凸部４ｂの断面形状（具体的には、配置孔４ａの中心を通過する断面における凸部４ｂの形状）は、一方の表面３ｄから第１の中間位置４ｐに向かうにしたがって配置孔４ａの径方向内側に傾斜する第３傾斜辺４ｈと、他方の表面３ｆから第２の中間位置４ｑに向かうにしたがって配置孔４ａの径方向内側に傾斜する第４傾斜辺４ｊと、第１の中間位置４ｐと第２の中間位置４ｑとを結ぶ凸曲線４ｓとを有する略山形状となっている。図５に示す例では、第３傾斜辺４ｈの長さと第４傾斜辺４ｊの長さとが等しくなっているが、第３傾斜辺４ｈの長さと第４傾斜辺４ｊの長さとは等しくなくても良い。 That is, the cross-sectional shape of the convex portion 4b in the thickness direction of the marker fixing portion 3 (specifically, the shape of the convex portion 4b in the cross section passing through the center of the arrangement hole 4a) is the first intermediate from the surface 3d. A third inclined side 4h that inclines inward in the radial direction of the arrangement hole 4a toward the position 4p, and a fourth inclining inward in the radial direction of the arrangement hole 4a from the other surface 3f toward the second intermediate position 4q. It has a substantially mountain shape having an inclined side 4j and a convex curve 4s connecting the first intermediate position 4p and the second intermediate position 4q. In the example shown in FIG. 5, the length of the third inclined side 4h and the length of the fourth inclined side 4j are equal, but the length of the third inclined side 4h and the length of the fourth inclined side 4j are not equal. Also good.

配置孔３ａに代えて配置孔４ａがマーカ固定部３に形成されている場合であっても、上述した形態と同様の効果を得ることができる。 Even if it is a case where it replaces with the arrangement | positioning hole 3a and the arrangement | positioning hole 4a is formed in the marker fixing | fixed part 3, the effect similar to the form mentioned above can be acquired.

（配置孔の変形例２）
図６（Ａ）は、本発明の変形例２にかかる配置孔５ａの断面図であり、図６（Ｂ）は、（Ａ）の配置孔５ａにマーカ２を取り付けた状態を示す断面図である。 (Arrangement hole modification 2)
6A is a cross-sectional view of the arrangement hole 5a according to Modification 2 of the present invention, and FIG. 6B is a cross-sectional view showing a state in which the marker 2 is attached to the arrangement hole 5a of FIG. is there.

マーカ固定部３には、上述した配置孔３ａに代えて、図６に示すように、配置孔５ａが形成されても良い。配置孔５ａは、Ｖ方向から見たときの形状が略円形状となるように形成されている。また、配置孔５ａには、配置孔５ａの径方向内側に向かって突出する凸部５ｂが形成されている。 Instead of the arrangement hole 3a described above, an arrangement hole 5a may be formed in the marker fixing portion 3 as shown in FIG. The arrangement hole 5a is formed so that the shape when viewed from the V direction is substantially circular. Moreover, the convex part 5b which protrudes toward the radial inside of the arrangement | positioning hole 5a is formed in the arrangement | positioning hole 5a.

凸部５ｂは、配置孔５ａの周方向の全域に形成されている。また、凸部５ｂは、マーカ固定部３の一方の表面３ｄと他方の表面３ｆとを結ぶ凸曲面状に形成されている。すなわち、マーカ固定部３の厚さ方向における凸部５ｂの断面形状（具体的には、配置孔５ａの中心を通過する断面における凸部５ｂの形状）は、一方の表面３ｄと他方の表面３ｆとを結ぶ凸曲線状に形成されている。そのため、配置孔５ａに充填されるマーカ２の形状は、その側面が円弧状に窪む略鼓状となっている。なお、図６に示す例では、凸部５ｂの断面形状は、半円弧状の凸曲線となっているが、凸部５ｂの断面形状は、半円弧状以外の凸曲線となっていても良い。 The convex part 5b is formed in the whole area of the circumferential direction of the arrangement | positioning hole 5a. Moreover, the convex part 5b is formed in the convex curved surface shape which connects one surface 3d of the marker fixing | fixed part 3, and the other surface 3f. That is, the cross-sectional shape of the convex portion 5b in the thickness direction of the marker fixing portion 3 (specifically, the shape of the convex portion 5b in the cross section passing through the center of the arrangement hole 5a) is one surface 3d and the other surface 3f. Are formed in a convex curve shape. Therefore, the shape of the marker 2 filled in the arrangement hole 5a is a substantially drum shape whose side surface is recessed in an arc shape. In the example shown in FIG. 6, the cross-sectional shape of the convex portion 5b is a semicircular arc-shaped convex curve, but the cross-sectional shape of the convex portion 5b may be a convex curve other than the semicircular arc shape. .

配置孔３ａに代えて配置孔５ａがマーカ固定部３に形成されている場合であっても、上述した形態と同様の効果を得ることができる。 Even when the arrangement hole 5a is formed in the marker fixing portion 3 in place of the arrangement hole 3a, the same effect as the above-described embodiment can be obtained.

（配置孔の変形例３）
図７（Ａ）は、本発明の変形例３にかかる配置孔６ａの断面図であり、図７（Ｂ）は、（Ａ）の配置孔６ａにマーカ２を取り付けた状態を示す断面図である。 (Modification 3 of the arrangement hole)
FIG. 7A is a cross-sectional view of an arrangement hole 6a according to Modification 3 of the present invention, and FIG. 7B is a cross-sectional view showing a state in which the marker 2 is attached to the arrangement hole 6a of FIG. is there.

マーカ固定部３には、上述した配置孔３ａに代えて、図７に示すように、配置孔６ａが形成されても良い。配置孔６ａは、Ｖ方向から見たときの形状が略円形状となるように形成されている。また、配置孔６ａには、配置孔６ａの径方向外側に向かって窪む凹部６ｂが形成されている。 Instead of the arrangement hole 3a described above, an arrangement hole 6a may be formed in the marker fixing portion 3 as shown in FIG. The arrangement hole 6a is formed so that the shape when viewed from the V direction is substantially circular. Further, the arrangement hole 6a is formed with a recess 6b that is recessed toward the outside in the radial direction of the arrangement hole 6a.

凹部６ｂは、配置孔６ａの周方向の全域に形成されている。また、図７（Ａ）に示すように、マーカ固定部３の一方の表面３ｄからＶ方向におけるマーカ固定部３の中間部６ｃに向かって広がる円錐台状の円錐台面６ｅと、マーカ固定部３の他方の表面３ｆから中間部６ｃに向かって広がる円錐台状の円錐台面６ｇとによって配置孔６ａの内周面が構成されるように、凹部６ｂが形成されている。 The recessed part 6b is formed in the whole circumferential direction of the arrangement | positioning hole 6a. Further, as shown in FIG. 7A, a truncated cone-shaped truncated cone surface 6e extending from one surface 3d of the marker fixing portion 3 toward the intermediate portion 6c of the marker fixing portion 3 in the V direction, and the marker fixing portion 3 The concave portion 6b is formed so that the inner peripheral surface of the arrangement hole 6a is constituted by the truncated cone-shaped truncated cone surface 6g extending from the other surface 3f toward the intermediate portion 6c.

すなわち、マーカ固定部３の厚さ方向における凹部６ｂの断面形状（具体的には、配置孔６ａの中心を通過する断面における凹部６ｂの形状）は、一方の表面３ｄから中間部６ｃに向かうにしたがって配置孔６ａの径方向外側に傾斜する第５傾斜辺６ｈと、他方の表面３ｆから中間部６ｃに向かうにしたがって配置孔６ａの径方向外側に傾斜する第６傾斜辺６ｊとを有する略三角形状に形成されている。本形態では、Ｖ方向における凹部６ｂの断面形状は、第５傾斜辺６ｈの長さと第６傾斜辺６ｊの長さとが等しい略二等辺三角形状となっている。また、配置孔６ａに充填されるマーカ２のＶ方向における断面形状は、図７（Ｂ）に示すように、略六角形状となっている。なお、第５傾斜辺６ｈの長さと第６傾斜辺６ｊの長さとは等しくなくても良い。 That is, the cross-sectional shape of the concave portion 6b in the thickness direction of the marker fixing portion 3 (specifically, the shape of the concave portion 6b in the cross section passing through the center of the arrangement hole 6a) is directed from the one surface 3d toward the intermediate portion 6c. Accordingly, a substantially triangular shape having a fifth inclined side 6h inclined outward in the radial direction of the arrangement hole 6a and a sixth inclined side 6j inclined inward in the radial direction of the arrangement hole 6a from the other surface 3f toward the intermediate portion 6c. It is formed into a shape. In this embodiment, the cross-sectional shape of the recess 6b in the V direction is a substantially isosceles triangle shape in which the length of the fifth inclined side 6h and the length of the sixth inclined side 6j are equal. Moreover, the cross-sectional shape in the V direction of the marker 2 filled in the arrangement hole 6a is a substantially hexagonal shape as shown in FIG. Note that the length of the fifth inclined side 6h and the length of the sixth inclined side 6j may not be equal.

配置孔３ａに代えて配置孔６ａがマーカ固定部３に形成されている場合であっても、上述した形態とほぼ同様の効果を得ることができる。すなわち、配置孔６ａの内周面は、２個の円錐台面６ｅ、６ｇによって構成されているため、一方の表面３ｄにおける配置孔６ａの開口部６ｋおよび他方の表面３ｆにおける配置孔６ａの開口部６ｍの径を小さくし、かつ、中間部６ｃにおける配置孔６ａの径を大きくすることができる。したがって、開口部６ｋ、６ｍの径を小さくした分だけ配置孔６ａに充填されるマーカ２の体積を減らすことができ、マーカ２を構成する放射線不透過材料の使用量を減らすことができる。また、中間部６ｃにおける配置孔６ａの径を大きくすることができるため、中間部６ｃにおけるマーカ２の断面積を大きくすることができる。その結果、この変形例３においても、マーカ２を構成する放射線不透過材料の使用量を減らしても、マーカ２は検出されやすくなる。また、変形例３では、Ｖ方向における凹部６ｂの断面形状が略三角形状となっているため、配置孔６ａからのマーカ２の抜け落ちを防止することが可能になる。 Even when the arrangement hole 6a is formed in the marker fixing portion 3 in place of the arrangement hole 3a, substantially the same effect as that of the above-described embodiment can be obtained. That is, since the inner peripheral surface of the arrangement hole 6a is constituted by the two truncated cone surfaces 6e and 6g, the opening 6k of the arrangement hole 6a on the one surface 3d and the opening of the arrangement hole 6a on the other surface 3f. The diameter of 6m can be reduced, and the diameter of the arrangement hole 6a in the intermediate portion 6c can be increased. Therefore, the volume of the marker 2 filled in the arrangement hole 6a can be reduced by an amount corresponding to the reduced diameter of the openings 6k and 6m, and the amount of the radiopaque material constituting the marker 2 can be reduced. Moreover, since the diameter of the arrangement | positioning hole 6a in the intermediate part 6c can be enlarged, the cross-sectional area of the marker 2 in the intermediate part 6c can be enlarged. As a result, also in the third modification, the marker 2 is easily detected even if the amount of the radiopaque material constituting the marker 2 is reduced. Moreover, in the modification 3, since the cross-sectional shape of the recessed part 6b in a V direction becomes substantially triangular shape, it becomes possible to prevent the marker 2 from dropping out from the arrangement | positioning hole 6a.

なお、以上の効果をより効果的に得るためには、一方の表面３ｄに対する第５傾斜辺６ｈの傾斜角度α３、および、他方の表面３ｆに対する第６傾斜辺６ｊの傾斜角度α４は、４５°よりも小さくなっていることが好ましい。 In order to obtain the above effect more effectively, the inclination angle α3 of the fifth inclined side 6h with respect to one surface 3d and the inclination angle α4 of the sixth inclined side 6j with respect to the other surface 3f are 45 °. It is preferable to be smaller.

（配置孔の変形例４）
図８は、本発明の変形例４にかかる配置孔７ａにマーカ２を取り付けた状態を示す断面図である。 (Modification 4 of the arrangement hole)
FIG. 8 is a cross-sectional view showing a state in which the marker 2 is attached to the arrangement hole 7a according to Modification 4 of the present invention.

マーカ固定部３には、上述した配置孔３ａに代えて、図８に示すように、配置孔７ａが形成されても良い。配置孔７ａは、Ｖ方向から見たときの形状が略円形状となるように形成されている。また、配置孔７ａには、配置孔７ａの径方向外側に向かって窪む凹部７ｂが形成されている。 Instead of the arrangement hole 3a described above, an arrangement hole 7a may be formed in the marker fixing portion 3 as shown in FIG. The arrangement hole 7a is formed so that the shape when viewed from the V direction is substantially circular. Further, the arrangement hole 7a is formed with a recess 7b that is recessed toward the outside in the radial direction of the arrangement hole 7a.

凹部７ｂは、配置孔７ａの周方向の全域に形成されている。また、凹部７ｂは、マーカ固定部３の一方の表面３ｄと他方の表面３ｆとを結ぶ凹曲面状に形成されている。すなわち、マーカ固定部３の厚さ方向における凹部７ｂの断面形状（具体的には、配置孔７ａの中心を通過する断面における凹部７ｂの形状）は、一方の表面３ｄと他方の表面３ｆとを結ぶ凹曲線状に形成されている。そのため、配置孔７ａに充填されるマーカ２のＶ方向における断面形状は、略長円形状となる。なお、図８に示す例では、凹部７ｂの断面形状は、半円弧状の凹曲線となっているが、凹部７ｂの断面形状は、半円弧状以外の凹曲線となっていても良い。 The recess 7b is formed in the entire circumferential direction of the arrangement hole 7a. The concave portion 7b is formed in a concave curved surface shape connecting the one surface 3d of the marker fixing portion 3 and the other surface 3f. That is, the cross-sectional shape of the concave portion 7b in the thickness direction of the marker fixing portion 3 (specifically, the shape of the concave portion 7b in the cross section passing through the center of the arrangement hole 7a) is obtained by combining one surface 3d and the other surface 3f. It is formed in a concave curve shape. Therefore, the cross-sectional shape in the V direction of the marker 2 filled in the arrangement hole 7a is a substantially oval shape. In the example shown in FIG. 8, the cross-sectional shape of the concave portion 7b is a semicircular arc-shaped concave curve, but the cross-sectional shape of the concave portion 7b may be a concave curve other than the semicircular arc shape.

配置孔３ａに代えて配置孔７ａがマーカ固定部３に形成されている場合であっても、上述の変形例３と同様の効果を得ることができる。 Even when the arrangement hole 7a is formed in the marker fixing portion 3 in place of the arrangement hole 3a, the same effect as that of the above-described modification 3 can be obtained.

（配置孔の変形例５）
図９（Ａ）は、本発明の変形例５にかかる配置孔８ａの断面図であり、図８（Ｂ）は、（Ａ）の配置孔８ａにマーカ２を取り付けた状態を示す断面図である。 (Variation 5 of the arrangement hole)
9A is a cross-sectional view of an arrangement hole 8a according to Modification 5 of the present invention, and FIG. 8B is a cross-sectional view showing a state in which the marker 2 is attached to the arrangement hole 8a of FIG. is there.

マーカ固定部３には、上述した配置孔３ａに代えて、図９に示すように、配置孔８ａが形成されても良い。配置孔８ａは、Ｖ方向から見たときの形状が略円形状となるように形成されている。また、配置孔８ａには、配置孔８ａの径方向外側に向かって窪む凹部８ｂが形成されている。 Instead of the arrangement hole 3a described above, an arrangement hole 8a may be formed in the marker fixing portion 3 as shown in FIG. The arrangement hole 8a is formed so that the shape when viewed from the V direction is substantially circular. Further, the arrangement hole 8a is formed with a recess 8b that is recessed outward in the radial direction of the arrangement hole 8a.

凸部８ｂは、配置孔８ａの周方向の全域に形成されている。また、図９（Ａ）に示すように、一方の表面３ｄからＶ方向におけるマーカ固定部３の、一方の表面３ｄ寄りの第１の中間位置８ｐに向かって広がる円錐台状の円錐台面８ｅと、他方の表面３ｆからＶ方向におけるマーカ固定部３の、他方の表面３ｆ寄りの第２の中間位置８ｑに向かって広がる円錐台状の円錐台面８ｇと、円錐台面８ｅと円錐台面８ｇとを繋ぐ凸曲面８ｒとによって配置孔８ａの内周面が構成されるように、凸部８ｂが形成されている。 The convex part 8b is formed in the whole area of the circumferential direction of the arrangement | positioning hole 8a. Further, as shown in FIG. 9A, a truncated cone-shaped truncated cone surface 8e extending from the one surface 3d toward the first intermediate position 8p near the one surface 3d of the marker fixing portion 3 in the V direction. The frustoconical truncated cone surface 8g extending from the other surface 3f toward the second intermediate position 8q near the other surface 3f of the marker fixing portion 3 in the V direction is connected to the truncated cone surface 8e and the truncated cone surface 8g. The convex portion 8b is formed so that the inner circumferential surface of the arrangement hole 8a is constituted by the convex curved surface 8r.

すなわち、マーカ固定部３の厚さ方向における凸部８ｂの断面形状（具体的には、配置孔８ａの中心を通過する断面における凸部８ｂの形状）は、一方の表面３ｄから第１の中間位置８ｐに向かうにしたがって配置孔８ａの径方向外側に傾斜する第７傾斜辺８ｈと、他方の表面３ｆから第２の中間位置８ｑに向かうにしたがって配置孔８ａの径方向外側に傾斜する第８傾斜辺８ｊと、第１の中間位置８ｐと第２の中間位置８ｑとを結ぶ凸曲線８ｓとを有する略山形状となっている。図９に示す例では、第７傾斜辺８ｈの長さと第８傾斜辺８ｊの長さとが等しくなっているが、第７傾斜辺８ｈの長さと第８傾斜辺８ｊの長さとは等しくなくても良い。 That is, the cross-sectional shape of the convex portion 8b in the thickness direction of the marker fixing portion 3 (specifically, the shape of the convex portion 8b in the cross section passing through the center of the arrangement hole 8a) is the first intermediate from the surface 3d. A seventh inclined side 8h that inclines radially outward of the arrangement hole 8a toward the position 8p, and an eighth inclination that inclines radially outward of the arrangement hole 8a from the other surface 3f to the second intermediate position 8q. It has a substantially mountain shape having an inclined side 8j and a convex curve 8s connecting the first intermediate position 8p and the second intermediate position 8q. In the example shown in FIG. 9, the length of the seventh inclined side 8h is equal to the length of the eighth inclined side 8j, but the length of the seventh inclined side 8h is not equal to the length of the eighth inclined side 8j. Also good.

配置孔３ａに代えて配置孔８ａがマーカ固定部３に形成されている場合であっても、上述の変形例３と同様の効果を得ることができる。 Even when the arrangement hole 8a is formed in the marker fixing portion 3 in place of the arrangement hole 3a, the same effect as that of the above-described modification 3 can be obtained.

（他の実施の形態）
上述した形態では、配置孔３ａは、Ｖ方向から見たときの形状が略円形状となるように形成されているが、配置孔３ａは、Ｖ方向から見たときの形状が略四角形状等の多角形状となるように形成されても良い。たとえば、図１０（Ａ）に示すように、配置孔３ａは、Ｖ方向から見たときの形状が略長方形状となるように形成されても良い。また、配置孔３ａは、図１０（Ｂ）に示すように、Ｖ方向から見たときの形状が略長円形状となるように形成されても良いし、Ｖ方向から見たときの形状が略楕円形状となるように形成されても良い。また、配置孔３ａは、Ｖ方向から見たときの形状がその他の形状となるように形成されても良い。これらの場合にも、たとえば、配置孔３ａには、その周方向の全域に、その径方向内側に向かって突出する凸部３ｂが形成される。 (Other embodiments)
In the embodiment described above, the arrangement hole 3a is formed so as to have a substantially circular shape when viewed from the V direction. However, the arrangement hole 3a has a substantially square shape when viewed from the V direction. It may be formed to have a polygonal shape. For example, as shown in FIG. 10A, the arrangement hole 3a may be formed so that the shape when viewed from the V direction is a substantially rectangular shape. Moreover, the arrangement | positioning hole 3a may be formed so that the shape when it sees from a V direction may become a substantially ellipse shape, as shown to FIG. 10 (B), and the shape when it sees from a V direction has the shape. You may form so that it may become a substantially ellipse shape. Moreover, the arrangement | positioning hole 3a may be formed so that the shape when it sees from a V direction may become another shape. Also in these cases, for example, in the arrangement hole 3a, a convex portion 3b that protrudes inward in the radial direction is formed in the entire circumferential direction.

上述した形態では、凸部３ｂは、配置孔３ａの周方向の全域に形成されているが、配置孔３ａの周方向の一部に凸部３ｂが形成されても良い。たとえば、図１０（Ａ）に示すように、Ｖ方向から見たときの形状が略長方形状となるように配置孔３ａが形成される場合に、図１０（Ａ）における配置孔３ａの右側の内周側のみに凸部３ｂが形成されても良い。この場合には、図１０（Ａ）のＧ−Ｇ断面に相当する断面での配置孔３ｂの形状は、たとえば、図１１の断面図に示す形状となる。すなわち、Ｖ方向における凸部３ｂの断面形状は、第１傾斜辺３ｈと、第２傾斜辺３ｊとを有する略三角形状となり、凸部３ｂが形成されていない部分の配置孔３ａの断面形状は、Ｖ方向に平行な直線となる。 In the embodiment described above, the convex portion 3b is formed in the entire circumferential direction of the arrangement hole 3a. However, the convex portion 3b may be formed in a part of the arrangement hole 3a in the circumferential direction. For example, as shown in FIG. 10A, when the arrangement hole 3a is formed so that the shape when viewed from the V direction is substantially rectangular, the right side of the arrangement hole 3a in FIG. The convex portion 3b may be formed only on the inner peripheral side. In this case, the shape of the arrangement hole 3b in the cross section corresponding to the GG cross section of FIG. 10A is, for example, the shape shown in the cross sectional view of FIG. That is, the cross-sectional shape of the convex portion 3b in the V direction is a substantially triangular shape having the first inclined side 3h and the second inclined side 3j, and the cross-sectional shape of the arrangement hole 3a in the portion where the convex portion 3b is not formed is , A straight line parallel to the V direction.

上述した形態では、配置孔３ａは、５軸レーザ加工装置であるレーザ加工装置２０によって形成されているが、配置孔３ａは、５軸レーザ加工装置以外の多軸レーザ加工装置によって形成されても良い。また、上述した形態では、配置孔３ａは、レーザ加工によって形成されているが、配置孔３ａは、エッチング加工あるいは切削加工によって形成されても良い。 In the embodiment described above, the arrangement hole 3a is formed by the laser processing apparatus 20 that is a five-axis laser processing apparatus, but the arrangement hole 3a may be formed by a multi-axis laser processing apparatus other than the five-axis laser processing apparatus. good. In the embodiment described above, the arrangement hole 3a is formed by laser processing, but the arrangement hole 3a may be formed by etching or cutting.

なお、上述した形態では、配置孔３ａにマーカ２が充填されているが、配置孔３ａにマーカ２が充填されずに、配置孔３ａとマーカ２との間に隙間が形成されても良い。 In the above-described embodiment, the arrangement hole 3a is filled with the marker 2, but a gap may be formed between the arrangement hole 3a and the marker 2 without filling the arrangement hole 3a with the marker 2.

１ステント
２マーカ
３マーカ固定部
３ａ、４ａ、５ａ、６ａ、７ａ、８ａ配置孔
３ｂ、４ｂ、５ｂ凸部
３ｃマーカ固定部の中間部
３ｄマーカ固定部の一方の表面
３ｆマーカ固定部の他方の表面
３ｈ第１傾斜辺
３ｊ第２傾斜辺
４ｈ第３傾斜辺
４ｊ第４傾斜辺
４ｐ、８ｐ第１の中間位置
４ｑ、８ｑ第２の中間位置
４ｓ凸曲線
６ｂ、７ｂ、８ｂ凹部
６ｃマーカ固定部の中間部
６ｈ第５傾斜辺
６ｊ第６傾斜辺
８ｈ第７傾斜辺
８ｊ第８傾斜辺
８ｓ凹曲線
２０レーザ加工装置
２１管状部材
２４第１移動機構（移動機構の一部）
２５第２移動機構（移動機構の一部）
２６第３移動機構（移動機構の一部）
Ｖマーカ固定部の厚さ方向 DESCRIPTION OF SYMBOLS 1 Stent 2 Marker 3 Marker fixing | fixed part 3a, 4a, 5a, 6a, 7a, 8a Arrangement | positioning hole 3b, 4b, 5b Convex part 3c The intermediate part of a marker fixing | fixed part 3d One surface of a marker fixing | fixed part 3f The other of a marker fixing | fixed part Surface 3h First inclined side 3j Second inclined side 4h Third inclined side 4j Fourth inclined side 4p, 8p First intermediate position 4q, 8q Second intermediate position 4s Convex curve 6b, 7b, 8b Recessed part 6c Marker fixing part Intermediate portion 6h 5th inclined side 6j 6th inclined side 8h 7th inclined side 8j 8th inclined side 8s concave curve 20 laser processing device 21 tubular member 24 first moving mechanism (part of moving mechanism)
25 Second moving mechanism (part of moving mechanism)
26 Third moving mechanism (part of moving mechanism)
V Marker fixing part thickness direction

Claims

In the stent for expanding the tubular part in the human body from the inside,
A marker formed of a radiopaque material, and a marker fixing part to which the marker is fixed,
The marker fixing part is formed so that an arrangement hole in which the marker is arranged penetrates in the thickness direction of the marker fixing part,
At least a part of the arrangement hole in the circumferential direction of the arrangement hole is formed with a convex portion that protrudes radially inward of the arrangement hole,
The cross-sectional shape of the convex portion in the thickness direction of the marker fixing portion is the middle of the marker fixing portion in the thickness direction of the marker fixing portion from one surface of the marker fixing portion in the thickness direction of the marker fixing portion. From the other surface of the marker fixing portion in the thickness direction of the marker fixing portion toward the intermediate portion of the marker fixing portion. Accordingly, it has a substantially triangular shape having a second inclined side inclined inward in the radial direction of the arrangement hole, or a first intermediate position closer to the one surface in the thickness direction of the marker fixing portion from the one surface. A third inclined side inclined inward in the radial direction of the arrangement hole as it goes, and a second intermediate portion closer to the other surface in the thickness direction of the marker fixing portion from the other surface A substantially mountain shape having a fourth inclined side inclined inward in the radial direction of the arrangement hole and a convex curve connecting the first intermediate position and the second intermediate position, or the one Formed in the shape of a convex curve connecting the surface of the other surface and the other surface ,
The marker is filled in the placement hole, and the marker includes a protruding portion that protrudes outward in the thickness direction of the marker fixing portion from the one surface and the other surface. .

The arrangement hole is formed so that the shape when viewed from the thickness direction of the marker fixing portion is substantially circular,
The stent according to claim 1, wherein the convex portion is formed in an entire region in the circumferential direction of the arrangement hole so that the marker has a substantially drum shape.

In the stent for expanding the tubular part in the human body from the inside,
A marker formed of a radiopaque material, and a marker fixing part to which the marker is fixed,
The marker fixing part is formed so that an arrangement hole in which the marker is arranged penetrates in the thickness direction of the marker fixing part,
At least a part of the arrangement hole in the circumferential direction of the arrangement hole is formed with a recess that is recessed toward the radially outer side of the arrangement hole,
The cross-sectional shape of the concave portion in the thickness direction of the marker fixing portion is an intermediate portion of the marker fixing portion in the thickness direction of the marker fixing portion from one surface of the marker fixing portion in the thickness direction of the marker fixing portion. Toward the intermediate part of the marker fixing part from the other surface of the marker fixing part in the thickness direction of the marker fixing part. A substantially triangular shape having a sixth inclined side inclined outward in the radial direction of the arrangement hole, or a first intermediate position closer to the one surface in the thickness direction of the marker fixing portion from the one surface. And a second intermediate portion closer to the other surface in the thickness direction of the marker fixing portion from the other surface. A substantially mountain shape having an eighth inclined side that inclines radially outward of the arrangement hole and a concave curve connecting the first intermediate position and the second intermediate position, or the one Formed in a concave curve shape connecting the surface of the other surface and the other surface ,
The marker is filled in the placement hole, and the marker includes a protruding portion that protrudes outward in the thickness direction of the marker fixing portion from the one surface and the other surface. .

The arrangement hole is formed so that the shape when viewed from the thickness direction of the marker fixing portion is substantially circular,
The recess is formed in the entire area in the circumferential direction of the arrangement hole so that the cross-sectional shape of the marker in the thickness direction of the marker fixing portion is a substantially hexagonal shape, a substantially oval shape, or a substantially elliptical shape. The stent according to claim 3.

The arrangement hole is a laser processing apparatus for manufacturing the stent by laser processing of a tubular member, wherein a central axis of the tubular member is a first axis, and a predetermined axis orthogonal to the first axis is a first axis. A first rotation mechanism that rotates the tubular member around the first axis, and a second rotation mechanism that rotates a laser head that irradiates a laser toward the tubular member around the second axis when two axes are used. 5. A stent according to claim 1, wherein the stent is formed by a laser processing apparatus having a moving mechanism that relatively moves the tubular member in three directions orthogonal to the laser head. .