Method for fabricating a flexible and reinforced tubing

• US 6,517,765 B1
• Filed: 02/16/1999
• Issued: 02/11/2003
• Est. Priority Date: 10/21/1996
• Status: Expired due to Term

• Current Assignee: Scimed Life Systems Incorporated (Boston Scientific Corporation)
• Original Assignee: Interventional Technologies Incorporated (Boston Scientific Corporation)
• Inventors: Kelley, Gregory
• Primary Examiner(s): McDowell, Suzanne E.
• Application Number:
  US09/250,747
• Time in Patent Office: 1,456 Days
• Field of Search: 264/506, 264/129, 156/144, 156/143
• US Class Current: 264/510
• CPC Class Codes: A61M 25/0012 with embedded structures, e.g. coils, braids, meshes, strands or radiopaque coils
• CPC Class Codes: A61M 25/005 with embedded materials for reinforcement, e.g. wires, coils, braids
• CPC Class Codes: A61M 25/0053 having a variable stiffness along the longitudinal axis, e.g. by varying the pitch of the coil or braid
• CPC Class Codes: B29D 23/001 Pipes; Pipe joints pleated hoses B29D23/18
• CPC Class Codes: B29K 2105/06 containing reinforcements, fillers or inserts
• CPC Class Codes: B29L 2023/005 Hoses, i.e. flexible
• CPC Class Codes: B29L 2031/7542 Catheters

Abstract

Disclosed here within is the method of manufacture of a reinforced and flexible tube or catheter that can be used in a variety of applications. The first method of embedding the metallic coil or braided wire comprises the steps of engaging the metallic structure over the outer surface of the tubular member, applying heat through an appropriately sized mold to the outer surface of the tubular member while creating a pressure differential between the inner lumen and the outside surface of the tubular member for a specified period of time. The second method of embedding the metallic coil or braided wire comprises the steps of engaging the metallic structure onto the outer surface of a mandrel, positioning the mandrel/metallic structure within the lumen of the tubular member, placing the tubular member within an appropriately sized mold, applying heat through the mold to the tubular member while creating a pressure differential between the inner lumen and the outside surface of the tubular member for a specified period of time.

Claims

1. A method for reinforcing a tubular structure for medical devices which comprises the steps of:

(a) engaging at least one helical member onto an outer surface of a tubular member to form a composite tubular assembly having a first, a second end, and an inner lumen;

(b) positioning said composite tubular assembly in a heating mold;

(c) heating said composite tubular assembly into a temperature range, said temperature range being between a first temperature and a second temperature;

(d) creating a pressure differential between said outer surface and said inner lumen;

(e) reducing said pressure differential;

(f) removing said composite tubular assembly from said heating mold to result in a reinforced tubular structure; and

(g) applying a coating on an inner surface of said reinforced tubular structure.

2. A method as recited in claim 1 further comprising the steps of:

applying a coating on said outer surface of said reinforced tubular structure.

3. A method as recited in claim 1 wherein said heating mold is configured such that said reinforced tubular structure results in having one or more radii.

4. A method as recited in claim 1 wherein said reinforced tubular structure is oval, triangular, or square in cross section.

5. A method for reinforcing a tubular structure for medical devices which comprises the steps of:

(a) engaging at least one helical member onto a mandrel to form a processing assembly;

(b) positioning said processing assembly inside a tubular member to form a composite tubular assembly, said tubular member having an outer surface, an inner surface and an inner lumen;

(c) positioning said composite tubular assembly in a heating mold;

(d) heating said composite tubular assembly into a temperature range, said temperature range being between a first temperature and a second temperature;

(e) creating a pressure differential between said outer surface of said tubular member and said inner lumen of said tubular member;

(f) reducing said pressure differential;

(g) removing said composite tubular assembly from said heating mold to result in a reinforced tubular structure; and

(h) applying a coating on an inner surface of said reinforced tubular structure.

6. A method as recited in claim 5 further comprising the steps of applying a coating on the outer surface of said reinforced tubular structure.

7. A method as recited in claim 5 wherein said reinforced tubular structure results in having one or more radii.

8. A method as recited in claim 5 wherein said reinforced tubular structure results in having an oval, triangular, or square cross section.