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Guide wire and stent

外国特許コード F110003672
整理番号 A281-14WO
掲載日 2011年7月1日
出願国 欧州特許庁(EPO)
出願番号 08751863
公報番号 2143460
公報番号 2143460
出願日 平成20年4月17日(2008.4.17)
公報発行日 平成22年1月13日(2010.1.13)
公報発行日 平成27年7月22日(2015.7.22)
国際出願番号 JP2008057525
国際公開番号 WO2008139829
国際出願日 平成20年4月17日(2008.4.17)
国際公開日 平成20年11月20日(2008.11.20)
優先権データ
  • 2008JP057525 (2008.4.17) WO
  • 特願2007-124871 (2007.5.9) JP
発明の名称 (英語) Guide wire and stent
発明の概要(英語) A guide wire includes a distal core member made of a ferrous alloy which has shape memory properties and superelasticity.
The ferrous alloy preferably includes substantially two phases, and has a difference of 100°C or less between an Af point and an Ms point in a thermal hysteresis of martensitic transformation and reverse transformation.
The guide wire may include a proximal core member made of an iron-containing alloy and having a higher modulus of elasticity than the distal core member.
The two core members may be joined together by welding to form a core of the guide wire.
特許請求の範囲(英語) [claim1]
1. A guide wire comprising: a core (102) having distal and proximal portions, of which at least the distal portion is made of a ferrous alloy, and a proximal tube (105) which is made of a metallic material having a higher modulus of elasticity than the ferrous alloy and which covers at least part of the proximal portion of the core; wherein the ferrous alloy has shape memory properties and superelasticity, includes substantially two phases having a gamma phase and a gamma ' phase, and has a difference of 100 deg.C or less between a reverse transformation finish temperature and a martensitic transformation start temperature in a thermal hysteresis of martensitic transformation and reverse transformation.
[claim2]
2. The guide wire of claim 1, further comprising a tubular member (104) which covers a distal portion of the core.
[claim3]
3. The guide wire of claim 1 or 2, wherein the tubular member (104) is a coil.
[claim4]
4. The guide wire of claim 3, wherein the tubular member is made of plastic.
[claim5]
5. The guide wire (101) according to any one of claims 1 to 4, wherein the ferrous alloy comprising a composition which includes from 25 to 35 % by mass of nickel, from 10 to 30 % by mass of cobalt, and from 2 to 8 % by mass of aluminum, the composition including a total of from 1 to 20 % by mass of at least one selected from the group consisting of from 1 to 5 % by mass of titanium, from 2 to 10 % by mass of niobium, from 3 to 20 % by mass of tantalum, and the balance being from 35 to 50 % by mass of iron and inadvertent impurities.
[claim6]
6. The guide wire (101) of claim 5, wherein an abundance of a specific crystal orientation in a working direction for the ferrous alloy is at least 2.0.
[claim7]
7. A stent comprising a body (301) made of a ferrous alloy which has shape memory properties and superelasticity, includes substantially two phases having a gamma phase and a gamma ' phase, and has a difference of 100 deg.C or less between a reverse transformation finish temperature and a martensitic transformation start temperature in a thermal hysteresis of martensitic transformation and reverse transformation,
wherein the stent is a self-expanding stent formed in a substantially cylindrical shape, which is in a contracted state at the time of insertion into a body, and which is capable of returning to an original expanded shape prior to contraction when the stent has been placed within the body.
[claim8]
8. The stent of claim 7, wherein the stent body has a plurality of undulating rings (302) in an axial direction.
[claim9]
9. The stent of claim 7, wherein the stent body (301) is composed of braided wire.
[claim10]
10. The stent (301) according to any one of claims 7 to 9, wherein the ferrous alloy comprising a composition which includes from 25 to 35 % by mass of nickel, from 10 to 30 % by mass of cobalt, and from 2 to 8 % by mass of aluminum, the composition including a total of from 1 to 20 % by mass of at least one selected from the group consisting of from 1 to 5 % by mass of titanium, from 2 to 10 % by mass of niobium, from 3 to 20 % by mass of tantalum, and the balance being from 35 to 50 % by mass of iron and inadvertent impurities.
[claim11]
11. The stent (301) of claim 10, wherein an abundance of a specific crystal orientation in a working direction for the ferrous alloy is at least 2.0.
  • 出願人(英語)
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
  • TERUMO
  • 発明者(英語)
  • ISHIDA KIYOHITO
  • YAMAUCHI KIYOSHI
  • KAINUMA RYOSUKE
  • SUTOU YUJI
  • OMORI TOSHIHIRO
  • TANAKA YUUKI
  • MURAYAMA HIRAKU
  • SOUBA RYOUICHI
国際特許分類(IPC)
指定国 Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
参考情報 (研究プロジェクト等) CREST The Innovation of Simulation Technology and the Construction of Foundations for Its Practical Use AREA
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