Hollow tube body for medical tool and a catheter into which the hollow tube body is incorporated

• US 20040249277A1
• Filed: 02/12/2004
• Published: 12/09/2004
• Est. Priority Date: 02/17/2003
• Status: Abandoned Application

• Current Assignee: Asahi Intecc Company Limited, Osamu Kato, Osamu Katoh
• Original Assignee: Asahi Intecc Company Limited, Osamu Kato
• Inventors: Kato, Osamu, Kato, Tomihisa, Ozawa, Shinji
• Application Number:
  US10/776,637
• Publication Number:
  US 20040249277A1
• Time in Patent Office: Days
• US Class Current: 600/434
• CPC Class Codes: A61M 25/0012 with embedded structures, e.g. coils, braids, meshes, strands or radiopaque coils
• CPC Class Codes: A61M 25/0043 characterised by structural features
• CPC Class Codes: A61M 25/0068 Static characteristics of the catheter tip, e.g. shape, atraumatic tip, curved tip or tip structure
• CPC Class Codes: A61M 25/0069 Tip not integral with tube
• CPC Class Codes: A61M 25/008 Strength or flexibility characteristics of the catheter tip

Abstract

A hollow tube body for medical tool has a plurality of metallic wires (2) cylindrically stranded to form a flexible tube. An inner surface of the flexible tube forms a convex-concave structure represented by the metallic wires (2) formed semi-circular in corss section. A leading distal end of the flexible tube is formed into a knife-edge circle configuration to provide a knife-edge circle front (3). The hollow tube body is used for catheters (K, K1, K2 and K3) to impart them with a perforative ability so as to improve its quality and performance.

Claims

1. A hollow tube body for medical tool comprising:

a plurality of metallic wires cylindrically stranded to form a flexible tube, an inner surface of which forms a convex-concave structure represented by said metallic wires each formed semi-circular in corss section; and

a leading distal end of said flexible tube being formed into a knife-edge circle configuration to provide a knife-edge circle front.

2. The hollow tube body for medical tool according to claim 1, wherein a blade edge of said knife-edge circle front is outwardly arcuated in cross section, and diametrically decreases progressively as approaching outward.

3. The hollow tube body for medical tool according to claim 1, wherein a rigid-flexible property of said flexible tube gradually changes in the lengthwise direction.

4. A catheter comprising:

a hollow tube body for medical tool including a plurality of metallic wires cylindrically stranded to form a flexible tube, an inner surface of which forms a convex-concave structure represented by said metallic wires each formed semi-circular in corss section; and

a leading distal end of said flexible tube being formed into a knife-edge circle configuration to provide a knife-edge circle front;

said hollow tube body being applied at least partly to a mono-layered main tube body.

5. A catheter according to claim 4, wherein multi-layered tube structure is formed by slidably fitting an upper-layered tube onto a lower-layered tube of a main tube body, and at least one of said upper-layered tube and said lower-layered tube is applied at least partly to said hollow tube body.

6. The catheter according to claim 5, wherein an outer tube is slidably fit onto said upper-layered to form a three-layered structure, and a self-expansible stent mounted on said lower-layered tube is arranged to be pushably set and detachably released by means of said outer tube.

7. The catheter according to claim 6, wherein a stranding direction of metallic wires of said lower-layered tube and that of said upper-layered tube are mutually opposite, otherwise a stranding direction of metallic wires of said upper-layered tube and that of said outer tube are mutually opposite.

8. The catheter according to claim 6, a rigidity of which progressively increases in such a direction from said lower-layered tube to said upper-layered tube, otherwise said rigidity progressively increases in such a direction from said lower-layered tube to said outer tube.

9. The catheter according to claim 6, wherein a manipulating portion of said lower-layered tube and said upper-layered tube, or a manipulating portion of said lower-layered tube, said upper-layered tube and said outer tube are connected in a row to a handling section.