Method of making a catheter

• US 5,961,765 A
• Filed: 09/24/1997
• Issued: 10/05/1999
• Est. Priority Date: 09/20/1994
• Status: Expired due to Term

• Current Assignee: Boston Scientific Corporation
• Original Assignee: Schneider A G
• Inventors: Kastenhofer, Gerhard
• Primary Examiner(s): SELLS, JAMES D
• Application Number:
  US08/936,352
• Time in Patent Office: 741 Days
• Field of Search: 156/242, 156/244.11, 156/244.13, 156/293, 156/294
• US Class Current: 156/244.13
• CPC Class Codes: A61M 2025/0047 the inner layer having a higher lubricity
• CPC Class Codes: A61M 25/0009 Making of catheters or other medical or surgical tubes
• CPC Class Codes: A61M 25/0045 multi-layered, e.g. coated coating materials A61L29/08
• CPC Class Codes: A61M 25/0054 with regions for increasing flexibility
• 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 25/1027 Making of balloon catheters
• CPC Class Codes: A61M 25/1029 Production methods of the balloon members, e.g. blow-moulding, extruding, deposition or by wrapping a plurality of layers of balloon material around a mandril
• CPC Class Codes: A61M 25/1034 Joining of shaft and balloon
• CPC Class Codes: B29C 48/09 Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
• CPC Class Codes: B29C 48/18 the components being layers
• CPC Class Codes: B29L 2009/00 Layered products
• CPC Class Codes: B29L 2031/7542 Catheters
• CPC Class Codes: Y10T 428/1393 Multilayer [continuous layer]

Abstract

An interventional catheter for angioplasty and the like, comprising a catheter tube formed of two superposed layers of materials different from one another. The inner layer is comprised of a low friction nonkinkable material to avoid risk of clogging of a guide wire in the longitudinal lumen. The outer layer is comprised of a material with higher friction coefficient than the material forming the inner layer. The balloon is welded at its distal end to the outer layer of the catheter tube. The proximal end of the balloon is welded to a tube surrounding the catheter tube.

Claims

1. A method of making a catheter comprising:

(a) coextruding an elongate tube having a proximal portion and a distal portion, the tube comprising;

(i) an inner layer forming a lumen and comprising polymeric material having a first coefficient of friction; and

(ii) an outer layer forming an outer surface of the tubular body and comprising polymeric material having a second coefficient of friction which is greater than the first coefficient of friction; and

(b) welding a discrete balloon to the outer surface at the proximal portion of the tube.

2. The method of claim 1 wherein the inner layer and outer layer are congruent in length.

3. The method of claim 1 wherein only a distal portion of the polymeric balloon is welded to the outer surface.

4. The method of claim 1 wherein the inner layer comprises polyethylene.

5. The method of claim 4 wherein the inner layer consists essentially of high density polyethylene.

6. The method of claim 1 wherein the outer layer comprises polyamide.

7. The method of claim 4 wherein the outer layer comprises polyamide.

8. The method of claim 5 wherein the outer layer comprises polyamide.