Catheter with skived tubular member

• US 8,057,430 B2
• Filed: 02/20/2009
• Issued: 11/15/2011
• Est. Priority Date: 02/20/2009
• Status: Active Grant

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Inventors: Xu, Chuanjing, Rowe, Todd, Rundquist, Charles, Gundale, Benjamin, McGowan, Roger W., Knowles, Thomas, Grovender, Adam D.
• Primary Examiner(s): Sirmons; Kevin C
• Assistant Examiner(s): Bosques; Edelmira
• Application Number:
  US12/389,393
• Publication Number:
  US 20100217234A1
• Time in Patent Office: 998 Days
• Field of Search: 604523-525, 604/103.04, 604/96.01
• US Class Current: 604/103.04
• CPC Class Codes: A61L 29/06 obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
• CPC Class Codes: A61M 2025/0183 Rapid exchange or monorail catheters
• CPC Class Codes: A61M 25/0015 Making lateral openings in a catheter tube, e.g. holes, slits, ports, piercings of guidewire ports; Methods for processing the holes, e.g. smoothing the edges
• CPC Class Codes: A61M 25/0023 by the form of the lumen, e.g. cross-section, variable diameter
• 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 25/0102 Insertion or introduction using an inner stiffening member, e.g. stylet or push-rod
• 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 25/1036 Making parts for balloon catheter systems, e.g. shafts or distal ends A61M25/1029 takes precedence
• CPC Class Codes: C08L 79/08 Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors

Abstract

An elongate shaft of a medical catheter including a thermoset polymeric tubular member including a skived distal portion. The skived distal portion includes a distally extending trough having a convex surface and a concave surface. A thermoplastic tubular sleeve may be positioned over at least a portion of the skived distal portion of the thermoset polymeric tubular member. In some instances, the thermoplastic tubular sleeve includes a crescent-shaped tubular portion defining a crescent-shaped lumen. The trough of the skived distal portion may extend through the crescent-shaped lumen. The thermoplastic tubular sleeve is thermally bonded to the inner and outer tubular members of a distal section of the elongate shaft at a guidewire port joint.

Claims

1. A medical catheter comprising:

a hub assembly; and

an elongate shaft extending distally from the hub assembly, the elongate shaft including a proximal section, a midshaft section, and a distal section;

the proximal section including a metallic hypotube;

the midshaft section including a thermoset polyimide tubular member and a thermoplastic tubular sleeve extending over at least a portion of the thermoset polyimide tubular member, the thermoset polyimide tubular member including a skived distal portion;

the distal section including an outer tubular member and an inner tubular member disposed within the outer tubular member;

wherein the thermoplastic tubular sleeve includes a crescent-shaped tubular portion defining a crescent-shaped lumen, wherein at least a portion of the skived distal portion of the thermoset polyimide tubular member is located within the crescent-shaped lumen of the crescent-shaped tubular portion of the thermoplastic tubular sleeve.

2. The medical catheter of claim 1, wherein the skived distal portion is a compound skived distal portion including a first cut surface portion through a wall of the thermoset polyimide tubular member and a second cut surface portion through the wall of the thermoset polyimide tubular member;

wherein the first cut surface portion is non-parallel to the second cut surface portion.

3. The medical catheter of claim 2, wherein the first cut surface portion is at an oblique angle to a longitudinal axis of the thermoset polyimide tubular member.

4. The medical catheter of claim 3, wherein the second cut surface portion is parallel to the longitudinal axis of the thermoset polyimide tubular member.

5. The medical catheter of claim 1, wherein the skived distal portion of the thermoset polyimide tubular member extends into a proximal portion of the outer tubular member of the distal section.

6. The medical catheter of claim 5, wherein a distal end of the thermoplastic tubular sleeve extends into the proximal portion of the outer tubular member of the distal section.

7. The medical catheter of claim 1, wherein a distal portion of the metallic hypotube extends into a proximal portion of the thermoset polyimide tubular member, forming a lap joint.

8. The medical catheter of claim 7, wherein a proximal portion of the thermoplastic tubular sleeve extends over the distal portion of the metallic hypotube.

9. The medical catheter of claim 8, wherein the thermoset polyimide tubular member has a longitudinal axis, and wherein the thermoset polyimide tubular member has a proximal end surface at an oblique angle to the longitudinal axis.

10. A medical catheter comprising:

a hub assembly; and

an elongate shaft extending distally from the hub assembly, the elongate shaft including a proximal section, a midshaft section, and a distal section;

the proximal section including a tubular member;

the midshaft section including a thermoset polymeric tubular member and a thermoplastic tubular sleeve extending over at least a portion of the thermoset polymeric tubular member, the thermoset polymeric tubular member including a skived distal portion having a compound cut surface including a first planar cut surface portion through a wall of the thermoset polymeric tubular member and a second planar cut surface portion through the wall of the thermoset polymeric tubular member, wherein the first planar cut surface portion is non-parallel to the second planar cut surface portion;

the distal section including an outer tubular member and an inner tubular member disposed within the outer tubular member;

wherein the skived distal portion of the thermoset polymeric tubular member overlaps a proximal portion of the outer tubular member of the distal section; and

wherein a distal portion of the thermoplastic tubular sleeve is thermally bonded to the inner tubular member and the outer tubular member of the distal section.

11. The medical catheter of claim 10, wherein the thermoplastic tubular sleeve includes a crescent-shaped tubular portion defining a crescent-shaped lumen, wherein at least a portion of the skived distal portion of the thermoset polymeric tubular member is located within the crescent-shaped lumen of the crescent-shaped tubular portion of the thermoplastic tubular sleeve.

12. The medical catheter of claim 10, wherein the first cut surface portion is at an oblique angle to a longitudinal axis of the thermoset polymeric tubular member.

13. The medical catheter of claim 10, wherein the second cut surface portion is parallel to the longitudinal axis of the thermoset polymeric tubular member.

14. The medical catheter of claim 10, wherein the skived distal portion of the thermoset polymeric tubular member extends into the outer tubular member of the distal section.

15. A medical catheter comprising:

a hub assembly; and

an elongate shaft extending distally from the hub assembly, the elongate shaft including a proximal section, a midshaft section extending distally from the proximal section with a proximal portion of the midshaft section overlapping a distal portion of the proximal section to form a proximal joint, and a distal section extending distally from the midshaft section and at least partially overlapping the midshaft section to form a distal joint;

wherein the proximal section includes a first tubular member;

wherein the midshaft section includes a second tubular member and a thermoplastic tubular sleeve extending over the second tubular member, the second tubular member includes a skived distal portion and the thermoplastic tubular sleeve includes a crescent-shaped tubular portion defining a crescent-shaped lumen, wherein at least a portion of the skived distal portion of the second tubular member is located within the crescent-shaped lumen of the crescent-shaped tubular portion of the thermoplastic tubular sleeve, a proximal portion of the second tubular member joined to a distal portion of the first tubular member at the proximal joint;

wherein the distal section includes an outer tubular member and an inner tubular member disposed within the outer tubular member, the inner and outer tubular members extending distally from the distal joint, wherein the inner tubular member defines a guidewire lumen extending distally from a guidewire port located at the distal joint, the guidewire port providing access to the guidewire lumen from exterior of the elongate shaft; and

wherein the thermoplastic tubular sleeve is bonded to at least one of the inner tubular member and the outer tubular member of the distal section at the distal joint and extends proximally to the proximal joint to a location proximal of a proximal end of the second tubular member such that a proximal portion of the thermoplastic tubular sleeve surrounds a portion of the first tubular member.

16. The medical catheter of claim 15, wherein the skived distal portion forms a U-shaped channel extending from a distal end of the second tubular member to a point proximal of the crescent-shaped lumen, wherein the U-shaped channel is aligned with the crescent-shaped lumen.