WO2010095664A1 - 筒状構造物の製造方法及びステント - Google Patents
筒状構造物の製造方法及びステント Download PDFInfo
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- WO2010095664A1 WO2010095664A1 PCT/JP2010/052376 JP2010052376W WO2010095664A1 WO 2010095664 A1 WO2010095664 A1 WO 2010095664A1 JP 2010052376 W JP2010052376 W JP 2010052376W WO 2010095664 A1 WO2010095664 A1 WO 2010095664A1
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- Prior art keywords
- polishing
- stent
- cylindrical
- polishing step
- magnetic
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
- B24B1/005—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes using a magnetic polishing agent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B31/00—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor
- B24B31/10—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor involving other means for tumbling of work
- B24B31/112—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor involving other means for tumbling of work using magnetically consolidated grinding powder, moved relatively to the workpiece under the influence of pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
- B24B5/36—Single-purpose machines or devices
- B24B5/40—Single-purpose machines or devices for grinding tubes internally
Definitions
- the present invention relates to a method for manufacturing a cylindrical structure and a stent. More specifically, the present invention relates to a cylindrical substrate having a side peripheral portion formed in a bellows shape in a polishing container, and the surface of the stored cylindrical substrate is coated with magnetic particles. And a method of manufacturing a cylindrical structure by polishing with abrasive grains and a stent manufactured by this method.
- stents also called luminal dilators
- luminal dilators are cut by laser cutting in order to apply an outward expansion force to the side periphery of a cylindrical body made of a material with excellent expansion force and resilience.
- the medical device is formed by subjecting a stent base having the side periphery formed in a bellows shape to a polishing process such as magnetic polishing.
- Such a stent is, for example, compressed and mounted in a catheter or on a balloon at the distal end of the catheter so as to have a small diameter.
- the balloon at the tip of the catheter is expanded and placed at the same time as the stenosis site of the blood vessel.
- the following methods are known as magnetic polishing methods as described above.
- the stent substrate is accommodated in a polishing container, and magnetic particles made of a magnetic material sealed inside the polishing container are caused to flow along the circumferential direction of the stent substrate by the action of magnetic poles arranged outside the polishing container; and
- This is a method of manufacturing a stent by polishing the surface of a stent base by supplying abrasive grains made of a non-magnetic material along the axial direction of the stent base from an external supply source. According to such a method, the surface of the stent substrate can be satisfactorily polished, and a stent having good surface smoothness can be manufactured (for example, see Patent Document 1).
- the present invention can provide a cylindrical structure that can satisfactorily polish the surface of the cylindrical structure and can perform fine processing to change the shape of the constituent parts of the cylindrical structure.
- An object of the present invention is to provide a manufacturing method and a stent.
- a manufacturing method of a cylindrical structure according to claim 1 of the present invention includes a cylindrical substrate having a side peripheral portion formed in a bellows shape in a polishing container, and the outside of the polishing container.
- the magnetic particles made of a magnetic material are caused to flow along the circumferential direction of the cylindrical base body by the action of the magnetic poles arranged on the surface, and the abrasive particles made of a non-magnetic material are made to flow by the supply means arranged outside the polishing container.
- the inner surface of the cylindrical substrate is coated.
- the cylindrical structure manufacturing method according to claim 2 of the present invention is characterized in that, in the above-described claim 1, polishing conditions for the first polishing step and the second polishing step are changed.
- the manufacturing method of the cylindrical structure which concerns on Claim 3 of this invention changes the process time of the said 1st grinding
- a method for manufacturing a cylindrical structure according to any one of the first to third aspects, wherein the magnitude of the magnetic force in the first polishing step and the second polishing step. It is characterized by changing.
- the second polishing step takes a longer process time than the first polishing step. It is characterized by its length.
- the method for manufacturing a cylindrical structure according to a sixth aspect of the present invention is the method for manufacturing a cylindrical structure according to any one of the first to fifth aspects, wherein the first polishing step and the second polishing step are such that the magnetic pole is the magnetic pole. It includes a step of moving at least one of the magnetic pole and the polishing container in such a manner that it is relatively displaced along the axial direction of the cylindrical substrate with respect to the cylindrical substrate.
- the first polishing step and the second polishing step may be configured such that the magnetic pole is at a central portion of the cylindrical base body.
- the time for moving the magnetic pole to a position corresponding to the end of the cylindrical substrate and polishing the end is longer than the time for moving to the corresponding position and polishing the central part. .
- the stent according to claim 8 of the present invention is characterized by being manufactured by the manufacturing method according to any one of claims 1 to 7 described above.
- a second polishing step of polishing the exposed surface of the cylindrical substrate by flowing the magnetic particles and abrasive grains in the coated state, and the time required for the first polishing step and the time required for the second polishing step It is possible to satisfactorily polish the surface of the cylindrical structure by adjusting the polishing portion, or by adjusting the polishing portion in the first polishing step and the polishing portion in the second polishing step, and the cylindrical structure There exists an effect that the fine process which changes the shape of this component part can be given.
- FIG. 1 schematically shows a polishing apparatus for realizing a stent (tubular structure) manufacturing method according to an embodiment of the present invention.
- FIG. 2 is an explanatory view schematically showing the inside of the polishing container in the first polishing step.
- FIG. 3 is a longitudinal sectional view schematically showing the inside of the polishing container in the first polishing step.
- FIG. 4 is an explanatory view schematically showing the inside of the polishing container in the second polishing step.
- FIG. 5 is a longitudinal sectional view schematically showing the inside of the polishing container in the second polishing step.
- FIG. 6 is an enlarged longitudinal sectional view showing a main part of the stent manufactured by the manufacturing method according to the embodiment of the present invention.
- FIG. 7 is an enlarged longitudinal sectional view showing a main part of the stent manufactured by the manufacturing method according to the embodiment of the present invention.
- FIG. 8 is an explanatory view showing a stent manufactured by a conventional manufacturing method and the main part.
- FIG. 1 schematically shows a polishing apparatus for realizing a method for manufacturing a stent (tubular structure) according to an embodiment of the present invention.
- the polishing apparatus 1 exemplified here is configured by sequentially connecting an abrasive tank 2, a pump 3 and a polishing container 4 through a pipe 5.
- the abrasive tank 2 stores abrasive grains 6. More specifically, the slurry-like abrasive grains 6 in which diamond, alumina oxide, silicon nitride or the like is mixed in oil are stored.
- the pump 3 sucks and discharges the slurry-like abrasive grains 6 stored in the abrasive grain tank 2, whereby the abrasive grains are sequentially arranged in the order of the polishing container 4 and the abrasive grain tank 2 through the pipe 5 as shown by the arrows in FIG. 1.
- the polishing container 4 is a cylindrical container having openings at both ends connected to the pipe 5, and fixes and supports a stent substrate (tubular substrate) 10 inside.
- the stent base 10 is, for example, a side peripheral portion of a cylindrical body formed of a flexible restoring material such as stainless steel, cobalt-chromium (Co—Cr) alloy, titanium-nickel (Ti—Ni) alloy, or the like.
- a cut is formed by laser cutting, and the side peripheral portion is formed in a bellows shape.
- polishing container 4 magnetic particles 7 made of a magnetic material such as iron, nickel, or stainless steel subjected to special treatment are encapsulated in advance. Further, although not clearly shown in the drawing, the polishing container 4 is rotatable about its own central axis as an axis.
- a magnetic pole 8 as a magnetic force generation source is disposed outside the polishing container 4.
- the magnetic poles 8 are arranged so that the ones facing each other across the polishing container 4 have different polarities. These magnetic poles 8 are slidably movable along the axial direction of the polishing container 4 although not shown in the drawing.
- an electromagnet can be applied as the magnetic force generation source, and the magnitude of the magnetic force can be changed as appropriate.
- the stent 20 (see FIG. 6) is manufactured from the stent base 10 using the polishing apparatus 1 as follows. First, the stent substrate 10 is placed in the polishing container 4. Although there are various arrangement methods, in the present embodiment, as shown in FIGS. 2 and 3, the long cylindrical rod member 11 is inserted into the hollow interior of the stent base 10 to enter the interior of the polishing container 4. Place fixedly supported. Here, the rod member 11 has an outer diameter compatible with or slightly smaller than the inner diameter of the stent base 10, and has an axial length sufficiently longer than the stent base 10. By inserting the rod member 11 into the stent base 10 in this way, the inner surface of the stent base 10 is covered with the rod member 11.
- the polishing container 4 After fixing and supporting the stent substrate 10 in this manner, the polishing container 4 is rotated around its own axis and the pump 3 is driven. Thereby, the slurry-like abrasive grains 6 carried between the magnetic grains 7 and the magnetic grains 7 flow and polish a predetermined portion of the exposed surface of the stent substrate 10 (first polishing step). At this time, the exposed surface of the stent base 10 can be more effectively polished by slightly reciprocating the magnetic pole 8 along the axial direction of the polishing container 4.
- the magnetic pole 8 is moved along the axial direction of the polishing container 4, that is, the magnetic pole 8 is displaced relative to the stent base 10 along the axial direction of the stent base 10. Then, the polishing container 4 is rotated again around its own axis and the pump 3 is driven to polish the exposed surface of another portion of the stent substrate 10. Also at this time, the exposed surface of the stent substrate 10 can be more effectively polished by slightly reciprocating the magnetic pole 8 along the axial direction of the polishing container 4.
- the pump 3 After repeating the above operation and polishing the exposed surface of the stent substrate 10 whose inner surface is coated, the pump 3 is stopped and the polishing container 4 is stopped rotating.
- the stent substrate 10 is fixedly supported inside the polishing container 4 by entering the hollow inside of the cylindrical member 12 having a long cylindrical shape.
- the cylindrical member 12 has an inner diameter that matches or is slightly larger than the outer diameter of the stent base 10, and has an axial length sufficiently longer than the stent base 10.
- the polishing container 4 After fixing and supporting the stent substrate 10 in this manner, the polishing container 4 is rotated around its own axis and the pump 3 is driven. As a result, the magnetic grains 7 and the slurry-like abrasive grains 6 carried between the magnetic grains 7 flow and polish a predetermined portion of the exposed surface of the stent substrate 10 (second polishing step). At this time, the exposed surface of the stent base 10 can be more effectively polished by slightly reciprocating the magnetic pole 8 along the axial direction of the polishing container 4.
- the process time of the second polishing process is preferably longer than that of the first polishing process, more specifically about twice as long.
- the magnetic pole 8 is moved along the axial direction of the polishing container 4, that is, the magnetic pole 8 is displaced relative to the stent base 10 along the axial direction of the stent base 10. Then, the polishing container 4 is rotated again around its own axis and the pump 3 is driven to polish the exposed surface of another portion of the stent substrate 10. Also at this time, the exposed surface of the stent substrate 10 can be more effectively polished by slightly reciprocating the magnetic pole 8 along the axial direction of the polishing container 4.
- the pump 3 is stopped and the rotation of the polishing container 4 is stopped, whereby the stent is stopped. 20 can be manufactured.
- the surface of the stent 20 can be polished well. And the fine process which changes the shape of the component part of the stent 20 can be given.
- the outer surface of the strut portion 21 of the stent 20 is made larger than the inner surface as shown in FIG. Is possible.
- the stent 20 having such a strut portion 21 when the diameter of the stent 20 is expanded and indwelled, the contact area with the inner wall surface of the blood vessel is sufficiently secured, and contact with the bloodstream is ensured. The area can be reduced.
- polishing process include the process of moving the magnetic pole 8 along the axial direction of the grinding
- the cross-sectional area of the stent 20 can be adjusted as appropriate. More specifically, if the polishing time at both ends of the stent substrate 10 is made longer than the polishing time at the center of the stent substrate 10, the cross-sectional area of the strut portion 21 at the center 20a increases, and both ends 20b.
- the stent 20 having a small cross-sectional area of the strut portion 21 can be manufactured.
- the polishing container 4 rotates around its own axis
- the magnetic pole may rotate around the central axis of the polishing container.
- the polishing container 4 May reciprocate along its own axial direction, that is, vibrate.
- the magnetic pole 8 is slidable along the axial direction of the polishing container 4.
- the magnetic pole is located on the cylindrical base with respect to the cylindrical base.
- the polishing container may be slid along the axial direction of the polishing container in a manner that the polishing container is relatively displaced along the axial direction.
- the process time of the second polishing process is longer than that of the first polishing process.
- the magnetic force may be appropriately changed in each polishing process.
- the method for manufacturing a cylindrical structure according to the present invention is useful for manufacturing a cylindrical structure having a complicated shape such as a stent.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Media Introduction/Drainage Providing Device (AREA)
Abstract
Description
2 砥粒タンク
3 ポンプ
4 研磨容器
5 配管
6 砥粒
7 磁性粒
8 磁極
10 ステント基体
11 ロッド部材
12 円筒部材
20 ステント
21 ストラット部
Claims (8)
- 側周部が蛇腹状に形成された筒状基体を研磨容器に収容し、前記研磨容器の外部に配設した磁極の作用により磁性体よりなる磁性粒を前記筒状基体の周方向に沿って流動させ、かつ前記研磨容器の外部に配設した供給手段により非磁性体よりなる砥粒を前記研磨容器に供給し前記筒状基体の軸方向に沿って流動させることにより、前記筒状基体の表面を研磨して筒状構造物を製造する方法において、
前記筒状基体の内表面を被覆した状態で、前記磁性粒及び前記砥粒を流動させることにより前記筒状基体の露出面を研磨する第1研磨工程と、
前記筒状基体の外表面を被覆した状態で、前記磁性粒及び前記砥粒を流動させることにより前記筒状基体の露出面を研磨する第2研磨工程と
を含むことを特徴とする筒状構造物の製造方法。 - 前記第1研磨工程と前記第2研磨工程との研磨条件を変えることを特徴とする請求項1に記載の筒状構造物の製造方法。
- 前記第1研磨工程と前記第2研磨工程との工程時間を変えることを特徴とする請求項1又は請求項2に記載の筒状構造物の製造方法。
- 前記第1研磨工程と前記第2研磨工程とで磁力の大きさを変えることを特徴とする請求項1~3のいずれか一つに記載の筒状構造物の製造方法。
- 前記第2研磨工程は、前記第1研磨工程よりも工程時間を長大にしたことを特徴とする請求項1~4のいずれか一つに記載の筒状構造物の製造方法。
- 前記第1研磨工程及び前記第2研磨工程は、前記磁極が前記筒状基体に対して該筒状基体の軸方向に沿って相対的に変位する態様で、前記磁極及び前記研磨容器の少なくとも一方が移動する工程を含むことを特徴とする請求項1~5のいずれか一つに記載の筒状構造物の製造方法。
- 前記第1研磨工程及び前記第2研磨工程は、前記磁極が前記筒状基体の中央部に対応する位置に移動して該中央部を研磨する時間よりも前記磁極が前記筒状基体の端部に対応する位置に移動して該端部を研磨する時間を長大にしたことを特徴とする請求項6に記載の筒状構造物の製造方法。
- 請求項1~7のいずれかに記載の製造方法により製造されたことを特徴とするステント。
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JP2011500637A JP5438091B2 (ja) | 2009-02-17 | 2010-02-17 | 筒状構造物の製造方法及びステント |
US13/202,012 US8915769B2 (en) | 2009-02-17 | 2010-02-17 | Method of manufacturing tubular structure, and stent |
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WO2020062701A1 (zh) * | 2018-09-29 | 2020-04-02 | 大连理工大学 | 一种用于小型复杂曲面零件的浮动抛光装置及方法 |
CN109531376A (zh) * | 2018-11-27 | 2019-03-29 | 广东轻工职业技术学院 | 管件无心外圆砂带磨削及内孔磁力研磨复合加工装置和方法 |
CN109732466A (zh) * | 2019-01-21 | 2019-05-10 | 上海理工大学 | 一种用于波导行波管的超声辅助磁性复合流体抛光方法 |
CN113478378A (zh) * | 2021-09-07 | 2021-10-08 | 南通瓯海电气设备有限公司 | 一种金属管内壁抛光设备 |
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JPWO2010095664A1 (ja) | 2012-08-30 |
US20110301691A1 (en) | 2011-12-08 |
US8915769B2 (en) | 2014-12-23 |
JP5438091B2 (ja) | 2014-03-12 |
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