GUIDE WIRE

• US 20080119762A1
• Filed: 09/21/2007
• Published: 05/22/2008
• Est. Priority Date: 11/16/2006
• Status: Abandoned Application

• Current Assignee: Terumo Kabushiki Kaisha (Terumo Corporation)
• Original Assignee: Terumo Kabushiki Kaisha (Terumo Corporation)
• Inventors: Shirakawa, Katsuhiro, Yoshifusa, Yuuki, TATEISHI, Tadasu, Aimi, Youki
• Application Number:
  US11/859,370
• Publication Number:
  US 20080119762A1
• Time in Patent Office: Days
• US Class Current: 600/585
• CPC Class Codes: A61M 2025/09083 having a coil around a core
• CPC Class Codes: A61M 2025/09133 having specific material compositions or coatings; Materials with specific mechanical behaviours, e.g. stiffness, strength to transmit torque
• CPC Class Codes: A61M 2025/09175 having specific characteristics at the distal tip
• CPC Class Codes: A61M 25/09 Guide wires

Abstract

A guide wire includes a wire body, a wire distal end section at the distal side of the wire body and integrally formed in one piece with the wire body, a flat plate-shaped section provided at a distal end section of the guide wire and at the wire distal end section, a coating layer formed on a surface of the wire body, and a coil mounted at the wire distal end section. A surface part of the flat plate-shaped section preferably has a residual stress higher than that an internal part of the flat plate-shaped section.

Claims

1. A guide wire comprising a flat plate-shaped section at a distal end section of the guide wire, the flat plate-shaped section having opposite sides and an internal part, a surface part on at least one of the sides of the flat plate-shaped section possessing a residual stress higher than the residual stress of the internal part of the flat plate-shaped section.

2. The guide wire as set forth in claim 1, wherein surface parts on both of the sides of the flat plate-shaped section possess residual stresses higher than the residual stress in the internal part of the flat plate-shaped section.

3. The guide wire as set forth in claim 1, wherein the distal end section of the guide wire is comprised of a NiTi alloy.

4. The guide wire as set forth in claim 3, wherein the NiTi alloy constituting the flat plate-shaped section has a martensite phase at 20°

centigrade.

5. The guide wire as set forth in claim 4, wherein the NiTi alloy constituting the flat plate-shaped section has a reverse transformation start temperature lower than 20°

centigrade.

6. The guide wire as set forth in claim 3, wherein the distal end section has a taper section on the proximal side of the flat plate-shaped section, and the taper section possesses a parent phase of the NiTi alloy at 20°

centigrade.

7. The guide wire as set forth in claim 1, wherein the surface part on the one side of the flat plate-shaped section is shot-preened so that it possesses residual stress higher than the residual stress of the internal part of the flat plate-shaped section.

8. The guide wire as set forth in claim 1, further comprising a wire body, a first resin layer provided on at least a part of an outer surface of the wire body, and a projecting resin part covering an outer surface of the first resin layer, the projecting resin part comprising a plurality of spaced apart outwardly extending projections.

9. A guide wire comprising a flat plate-shaped section at a distal end section of the guide wire, the flat plate-shaped section possessing an internal part and a surface part on both sides of the internal part, the flat plate-shaped section being formed of a NiTi alloy, the internal part of the flat plate-shaped section having a martensite phase of the NiTi alloy, at least one of the surface parts of the flat plate-shaped section possessing a residual stress higher than the residual stress of the internal part, the flat plate-shaped section possessing a property allowing the flat plate-shaped section to be shaped by manual finger deformation.

10. The guide wire as set forth in claim 9, wherein the guide wire comprises a wire body possessing a distal end and a wire distal end section extending in a distal direction from the distal end of the wire distal end section, the flat plate-shaped section forming the distal end portion of the wire distal end section, the flat plate-shaped section possessing a reverse transformation start temperature different from the reverse transformation start temperature of another portion of the wire distal end section.

11. A method of manufacturing a guide wire comprising:

preparing a wire made of a NiTi alloy;

pressing a part of the wire made of the NiTi alloy to form a flat plate-shaped section;

heating the flat plate-shaped section during or after the pressing; and

imparting a residual stress to at least a portion of a surface part on at least one side of the flat plate-shaped section.

12. The method of manufacturing a guide wire as set forth in claim 11, wherein the residual stress is imparted to surface parts on both sides of the flat plate-shaped section.

13. The method of manufacturing a guide wire as set forth in claim 11, wherein the residual stress is imparted so that an internal part of the flat plate-shaped section has a residual stress lower than the residual stress in the surface part of the flat plate-shaped section.

14. The method of manufacturing a guide wire as set forth in claim 11, wherein the residual stress is imparted by shot peening.

15. The method of manufacturing a guide wire as set forth in claim 11, wherein the residual stress is imparted by ion plating.

16. The method of manufacturing a guide wire as set forth in claim 11, wherein the heating of the flat plate-shaped section is conducted so that the flat plate-shaped section includes a martensite phase at 20°

centigrade.

17. The method of manufacturing a guide wire as set forth in claim 11, wherein the heating of the flat plate-shaped section is conducted so that the flat plate-shaped section has a reverse transformation start temperature lower than 20°

centigrade.

18. The method of manufacturing a guide wire as set forth in claim 11, wherein the heating of the flat plate-shaped section is conducted so that the flat plate-shaped section has a reverse transformation start temperature lower than the reverse transformation start temperature of other sections of the wire made of the NiTi alloy.