Catheter with a polyimide distal tip

• US 20060030874A1
• Filed: 09/28/2005
• Published: 02/09/2006
• Est. Priority Date: 09/19/2001
• Status: Active Grant

• Current Assignee: Edwin Wang, Jeong S. Lee
• Original Assignee: Edwin Wang, Jeong S. Lee
• Inventors: Wang, Edwin, Lee, Jeong S.
• Granted Patent: US 8,075,583 B2
• Time in Patent Office: Days
• US Class Current: 606/192
• CPC Class Codes: A61L 2420/08 Coatings comprising two or more layers
• CPC Class Codes: A61L 29/085 Macromolecular materials
• CPC Class Codes: A61M 2025/1093 having particular tip characteristics
• CPC Class Codes: A61M 25/001 Forming the tip of a catheter, e.g. bevelling process, join or taper
• CPC Class Codes: A61M 25/0045 multi-layered, e.g. coated coating materials A61L29/08
• CPC Class Codes: A61M 25/0069 Tip not integral with tube
• 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: C08L 75/04 Polyurethanes
• CPC Class Codes: C08L 77/00 Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain of polyhydrazides C08L79/06; of polyamideimides or polyamide acids C08L79/08; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 77/12 Polyester-amides
• CPC Class Codes: C08L 79/08 Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors

Abstract

A catheter having an elongated shaft which has a multilayered distal tip with a first layer formed of a polyimide first material and a second layer formed of a polymeric second material. In one embodiment the multilayered distal tip is a separate member, distal to the distal end of a proximal portion of the shaft. In another embodiment, the shaft has an outer tubular member, and a multilayered inner tubular member with a distal end which forms the multilayered distal tip of the shaft. In a presently preferred embodiment, the polyimide material is a thermoset polyimide. In one embodiment, the polymeric second material is a polyamide material.

Claims

1. A catheter, comprising an elongated shaft having a proximal shaft section, a distal shaft section, and a multilayered distal tip at a distal end of the catheter with a lumen, the distal tip having a first layer formed of a polyimide first material and a second layer formed of a polymeric second material not fusion bondable to the polyimide first material.

2. The catheter of claim 1 wherein the polymeric second material is selected from the group consisting of polyamide, nylon, polyether block amide, and polyurethane.

3. The catheter of claim 1 wherein the polymeric second material has a lower Shore durometer hardness than the polyimide first material.

4. The catheter of claim 1 wherein the second layer is an outer layer forming an outer surface of the distal tip.

5. The catheter of claim 1 wherein the polyimide first material is a thermoset polyimide.

6. The catheter of claim 1 wherein the polyimide first layer is an inner layer forming an inner surface of the distal tip, defining the lumen of the distal tip.

7. The catheter of claim 1 wherein the second layer of the distal tip is in direct contact with the first layer around a circumference of the first layer.

8. The catheter of claim 1 wherein the second layer is solid-walled.

9. The catheter of claim 1 wherein the catheter is a balloon catheter with a balloon having a distal skirt section bonded to the second layer of the distal tip.

10. The catheter of claim 1 wherein the shaft has an outer tubular member with a first lumen, and an inner tubular member disposed within the outer tubular member lumen with a second lumen, the inner tubular member having a distal end which forms the distal tip of the shaft and which defines the distal tip lumen in fluid communication with the second lumen.

11. The catheter of claim 1 wherein the polyimide first layer is on an inner surface of the second layer.

12. The catheter of claim 1 including a lubricious liner on the inner surface of the polyimide first layer, which defines the lumen of the distal tip.

13. The catheter of claim 1 wherein the distal shaft section has a proximal tubular member with at least one lumen in fluid communication with the distal tip lumen, and the distal tip is a distal tip member located distal to the proximal tubular member.

14. The catheter of claim 13 wherein the distal tip member has a proximal end bonded to a distal end of the proximal tubular member.

15-28. -28. (canceled)

29. A balloon catheter, comprising:

a) an elongated shaft having an outer tubular member with a first lumen, and an inner tubular member disposed within the outer tubular member lumen with a second lumen and with a first layer formed of a polyimide first material, and a second layer which is on an outer surface of the first layer and which is formed of a polymeric second material not fusion bondable to the polyimide first material, the inner tubular member having a distal end which forms a distal tip of the shaft; and

b) a balloon on a distal section of the catheter shaft, having a proximal end secured to the outer tubular member, a distal end secured to the second layer of the inner tubular member, and an interior in fluid communication with the first lumen.

30. The balloon catheter of claim 29 wherein the polymeric second material has a lower Shore durometer hardness than the polyimide material

31. The balloon catheter of claim 29 including a liner formed of a lubricious material different from the polyimide first material, on an inner surface of at least a section of the inner tubular member.

32. The balloon catheter of claim 29 wherein the polymeric second material is selected from the group consisting of polyamide, nylon, polyether block amide, and polyurethane.

33. The catheter of claim 29 wherein the second layer of the inner tubular member is in direct contact with the polyimide first layer around a circumference polyimide first layer.

34-44. -44. (canceled)