Combination of balloon and stent with specific sizes

• US 6,283,990 B1
• Filed: 05/11/2000
• Issued: 09/04/2001
• Est. Priority Date: 05/11/2000
• Status: Expired due to Term

• Current Assignee: Bolton Medical, Inc. (Terumo Corporation)
• Original Assignee: Uni-Cath, Inc.
• Inventors: Kanesaka, Nozomu
• Primary Examiner(s): Recla, Henry J.
• Assistant Examiner(s): TRUONG, KEVIN THAO
• Application Number:
  US09/569,238
• Time in Patent Office: 481 Days
• Field of Search: 623/1.11, 623/1.12, 623/1.13, 623/1.16, 623/1.15, 623/1.2, 623/1.3, 606/191, 606/195, 606/198, 606/194, 606/192
• US Class Current: 623/1.11
• CPC Class Codes: A61F 2/86 Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
• CPC Class Codes: A61F 2/958 Inflatable balloons for placing stents or stent-grafts

Abstract

A balloon having a predetermined maximum expandable size is combined with a stent having a predetermined maximum expandable size, which is equal to the maximum expandable size of the balloon. The stent is formed of a plurality of rows of cylindrical strut sections situated side by side in a longitudinal direction, and a plurality of connecting members for connecting two rows of the struts adjacent to each other. The strut section includes struts, and bending portions located at ends of the struts. A strut angle is defined by the strut and a line parallel to a central axis of the stent and extending through the bending portion. The strut angle is at least 75 degrees and less than 90 degrees when the stent is fully expanded. Thus, the stent fully expanded by the balloon is not easily collapsed.

Claims

1. A combination comprising a balloon and an expandable stent to be expanded by the balloon,

said balloon having a predetermined maximum expandable size, and

said stent having a predetermined maximum expandable size equal to said maximum expandable size of the balloon when expanded by the balloon, and comprising:

a plurality of rows of cylindrical strut sections situated side by side in a longitudinal direction to form the stent, each of said strut sections in one row having struts, and bending portions located at ends of the struts to form a strut angle defined by the strut and a line parallel to a central axis of the stent and extending through the bending portion, said strut angle being at least 75 degrees and less than 90 degrees when the stent is fully expanded by the maximum expandable size of the balloon so that the stent fully expanded by the balloon is not easily collapsed; and

a plurality of connecting members for connecting two rows of the cylindrical strut sections adjacent to each other.

2. A combination according to claim 1, wherein said struts in the strut section are arranged side by side around the central axis of the stent to form a zig-zag pattern.

3. A combination according to claim 2, wherein said struts in the strut sections are arranged substantially parallel to each other before expansion.

4. A combination according to claim 2, wherein when an expanded diameter of the stent is 2.5 mm, a length of each of the struts is in a range of 0.58 mm to 0.81 mm.

5. A combination according to claim 2, wherein when an expanded diameter of the stent is 3.0 mm, a length of each of the struts is in a range of 0.70 mm to 0.98 mm.

6. A combination according to claim 2, wherein when an expanded diameter is 3.5 mm, a length of each of the struts is in a range of 0.81 mm to 1.14 mm.

7. A combination according to claim 2, wherein when an expanded diameter is 4.0 mm, a length of each of the struts is in a range of 0.93 mm to 1.30 mm.