Balloon catheter and manufacturing method of the same

• US 5,042,976 A
• Filed: 07/10/1989
• Issued: 08/27/1991
• Est. Priority Date: 01/13/1987
• Status: Expired due to Term

• Current Assignee: Terumo Kabushiki Kaisha (Terumo Corporation)
• Original Assignee: Terumo Kabushiki Kaisha (Terumo Corporation)
• Inventors: Tsuchida, Kouji, Sekii, Shigekazu, Ishitsu, Yoshio
• Primary Examiner(s): Yasko, John D.
• Assistant Examiner(s): Gutowski, Anthony
• Application Number:
  US07/391,503
• Time in Patent Office: 778 Days
• Field of Search: 604/96-103, 604/282, 600/18, 606/192-196
• US Class Current: 604/96.01
• CPC Class Codes: A61M 2025/1065 having a balloon which is inversely attached to the shaft at the distal or proximal end
• CPC Class Codes: A61M 25/10 Balloon catheters A61M25/0125 takes precedence; embolectomy A61B17/22032; retractors A61B17/02; inflatable balloons for placing stents or stent-grafts A61F2/958 ; stomach balloons for treatment of obesity A61F5/0003; oesophagal tubes A61J15/00
• CPC Class Codes: A61M 25/1002 characterised by balloon shape A61M25/1006, A61M25/1009 take precedence
• CPC Class Codes: A61M 25/1027 Making of balloon catheters
• CPC Class Codes: A61M 25/1034 Joining of shaft and balloon

Abstract

A balloon catheter is provided, which comprises a catheter body made of a flexible tube provided with at least one inner channel and with an annular groove formed on an outer surface near the distal end portion of the tube, and a balloon covering the annular groove in such a manner that the outer diameter of the balloon is equal to or smaller than a maximum diameter of the distal end portion of the tube, the balloon being expanded or shrunk through another inner channel. A method of manufacturing the balloon catheter which comprises the steps of reducnig an outer diameter of a distal end portion of the catheter body while keeping a desired inner channel undamaged, mounting a tubular heat-resistant member to a prospective balloon mounting portion of the reduced diameter portion, molding a reduced diameter portion extruded from the heat-resistant member into a spherical shape, and mounting an inflatable balloon to the balloon mounting portion after removing the heat-resistant member.

Claims

1. A balloon catheter comprising:

a catheter body formed as a single member and made of a flexible tube provided with at least one inner channel with an opening at a distal end portion thereof, the catheter body being provided with an annular groove formed on an outer surface of the tube and including a distal wall adjacent to the distal end portion, a proximal wall, and a bottom portion extending a predetermined length along an axial direction of the tube between said distal and proximal walls, and with a balloon inflation inner channel open to said bottom portion of the annular groove; and

a balloon secured to the catheter body for covering the bottom portion of the annular groove, the balloon being arranged in the annular groove such that an outer surface of a distal end portion of the balloon is contacted with, and is secured by a binding means to, the bottom portion of the annular groove adjacent said distal wall, with the rest of the balloon being everted over said binding means, with the proximal end of the balloon secured near the proximal wall, with the entire outer diameter of the balloon in its deflated state being equal to or smaller than a maximum outer diameter of the distal end portion of the tube.

2. A catheter according to claim 1, wherein an outer edge of said distal wall is a smooth curved surface.

3. A catheter according to claim 1, wherein the distal end portion has a smooth curved surface or is flat.

4. A catheter according to claim 1, wherein a cylindrical reinforcing member having an inner passage is coaxially inserted in a portion of the at least one inner channel over which the balloon is mounted, said inner passage being in communication with other portions of the at least one inner channel.

5. A catheter according to claim 4, wherein said reinforcing member has substantially the same inner diameter as that of the at least one inner channel and is connected thereto through a substantially smooth surface.

6. A catheter according to claim 4, wherein the reinforcing member is made of a heat-resistant hard plastic material.

7. A catheter according to claim 4, wherein the reinforcing member is made of a metal.

8. A catheter according to claim 4, wherein the reinforcing member is made of ceramics.

9. A balloon catheter according to claim 1, wherein the outer diameter of the balloon in its deflated state is equal to a maximum outer diameter of the distal end portion of the tube.

10. A balloon catheter according to claim 1, wherein said binding means is a winding of a string.

11. A balloon catheter according to claim 1, wherein said binding means is an adhesive.

12. A balloon catheter according to claim 4, wherein said cylindrical reinforcing member has a length extending from the distal end portion of the balloon to a proximal end portion of the balloon secured to the annular groove.