Medical guide wire

• US 20050096568A1
• Filed: 09/28/2004
• Published: 05/05/2005
• Est. Priority Date: 10/02/2003
• Status: Active Grant

• Current Assignee: Asahi Intecc Company Limited
• Original Assignee: Asahi Intecc Company Limited
• Inventors: Kato, Tomihisa
• Granted Patent: US 7,399,283 B2
• 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 25/09 Guide wires

Abstract

In a medical guide wire, a core line securement portion (11) is provided in which the core wire (2) is fixed to an inner side of the helical coil body (3) so as to form a top leading end portion (10) between the core line securement (11) and the head plug (4). A flat plane structure (13) is formed in which the core wire (2) of the top leading end portion (10) gradually changes through stepped portions (S) so that the core wire (2) progressively reduces its thickness stepwisely while successively increasing its breadth stepwisely as approaching a foremost distal end of the top leading end portion (10). This provides an improved flexibility, tender touchability, torsibility and torque transmissibility with the flat plane structure (13) so as to be accessible to the diseased area with a high detective and ablative ability.

Claims

1. A medical guide wire in which a core wire is inserted into a helical coil body, and a head plug is attached to each distal end of said core wire and said helical coil body;

the medical guide wire comprising;

a core line securement portion in which said core wire is fixed to an inner side of said helical coil body so as to form a top leading end portion between said core line securement and said plug head; and

a flat plane structure in which said core wire of said top leading end portion gradually changes through stepped portions so that said core wire progressively reduces its thickness sptepwisely while successively increasing its breadth sptepwisely as approaching a foremost distal end of said top leading end portion.

2. The medical guide wire according to claim 1, wherein said core wire of said top leading end portion comprises a core wire portion circular in cross section and said flat plane structure contiguous with said core wire portion.

3. The medical guide wire according to claim 2, wherein said core wire portion is tapered off toward a foremost distal end of said top leading end portion.

4. The medical guide wire according to claim 1, wherein said stepped portions extend in such a direction as to traverse said core wire.

5. The medical guide wire according to claim 1, wherein a cross sectional area of said core wire of said flat plane structure is equal throughout its lengthwise direction.

6. The medical guide wire according to claim 1, wherein said top leading end portion has a dimensional length of 24-45 mm measured from a foremost distal end of said plug head to said core line securement portion.

7. The medical guide wire according to claim 1, wherein said core wire is in the form of stranded wires.

8. The medical guide wire according to claim 7, wherein said core wire is wrought to reduce its outer diameter by means of a diameter-reducing treatment.

9. The medical guide wire according to any of claims 1-8, wherein said core wire is made of an austenitic stainless steel.