Enhanced flexibility neurovascular catheter with tensile support

Patent metadata

Field	Value
Publication number	US-11311303-B2
Application number	US-201916570084-A
Country	US
Kind code	B2
Filing date	Sep 13, 2019
Priority date	May 1, 2018
Publication date	Apr 26, 2022
Grant date	Apr 26, 2022

Abstract

A neurovascular catheter having an angled distal tip has an elongate flexible tubular body with a proximal end, a distal end and a side wall defining a central lumen. The side wall has a helical coil. A tubular jacket surrounds the helical coil, and extending distally beyond the helical coil distal end to terminate in a catheter distal face. A tubular radiopaque marker is embedded in the tubular jacket in between the distal end of the coil and the distal face. The distal face resides on a plane which crosses a longitudinal axis of the tubular body at an angle within the range of from about 35 degrees to about 55 degrees. The marker has a proximal face that is approximately perpendicular to the longitudinal axis and a distal face that resides on a plane which crosses the longitudinal axis at an angle within the range of from about 35 degrees to about 55 degrees.

First claim

What is claimed is:

1. An enhanced flexibility neurovascular catheter comprising:
a proximal end;
a distal end;
a side wall defining a central lumen, a distal zone of the side wall comprising a helical coil and a distal face on the distal end, the distal face residing on a plane that crosses a longitudinal axis of the neurovascular catheter at an angle, wherein the angle is at least about 55 degrees and at most about 65 degrees;
an outer jacket comprising:
a plurality of tubular segments, a proximal tubular segment of the plurality of tubular segments having a durometer of at least about 60 D, a distal tubular segment of the plurality of tubular segments having a durometer of at most about 35 D, and
a tubular radiopaque marker being distal to the helical coil, the radiopaque marker comprising at least one axially extending slit; and

a filament being positioned in the side wall, the filament extending axially from the distal end and towards the proximal end, the filament comprising a length of at least about 10 cm and at most about 50 cm, the filament being configured to resist elongation of the side wall when under tension,
wherein the distal face of the side wall defines a leading edge of the neurovascular catheter, wherein the leading edge extends distally of a trailing edge of the neurovascular catheter,
wherein the leading edge and the trailing edge are located about 180 degrees apart from each other around the longitudinal axis,
wherein the leading edge is located on a first side of the neurovascular catheter, wherein the trailing edge is located on a second side of the neurovascular catheter, and
wherein a first axial length of the tubular radiopaque marker on the first side is at least about 20% longer than a second axial length of the tubular radiopaque marker on the second side.

2. The enhanced flexibility neurovascular catheter of claim 1 , wherein the filament comprises multiple fibers.

3. The enhanced flexibility neurovascular catheter of claim 1 further comprising an inner liner, wherein the filament extends axially between the helical coil and the inner liner.

4. The enhanced flexibility neurovascular catheter of claim 1 , wherein the side wall further comprises:
a tubular inner liner; and
a tie layer being separated from the central lumen by the tubular inner liner,
wherein the helical coil surrounds the tie layer.

5. The enhanced flexibility neurovascular catheter of claim 4 , wherein the tubular inner liner is formed by dip coating a removable mandrel.

6. The enhanced flexibility neurovascular catheter of claim 4 , wherein the tubular inner liner comprises polytetrafluoroethylene.

7. The enhanced flexibility neurovascular catheter of claim 4 , wherein the tubular tie layer comprises polyurethane.

8. The enhanced flexibility neurovascular catheter of claim 7 , wherein the tubular tie layer comprises a wall thickness of at most about 0.005 inches.

9. The enhanced flexibility neurovascular catheter of claim 8 , wherein the tubular tie layer extends from the distal end and towards the proximal end, and wherein the tubular tie layer comprises a length of at least about 20 cm.

10. The enhanced flexibility neurovascular catheter of claim 1 , wherein the helical coil comprises a shape memory material.

11. The enhanced flexibility neurovascular catheter of claim 1 , wherein the plurality of tubular segments of the outer jacket comprises at least five tubular segments.

12. The enhanced flexibility neurovascular catheter of claim 11 , wherein a difference in the durometer of the proximal tubular segment and the durometer of the distal tubular segment is at least about 20 D.

13. The enhanced flexibility neurovascular catheter of claim 12 , wherein the difference in durometer is at least about 30 D.

14. The enhanced flexibility neurovascular catheter of claim 1 , wherein the plurality of tubular segment of the outer jacket comprises at least nine tubular segments.

15. The enhanced flexibility neurovascular catheter of claim 1 , wherein the length of the filament is at least about 20 cm and at most about 50 cm.

16. The enhanced flexibility neurovascular catheter of claim 1 , wherein the neurovascular catheter is configured to withstand at least about 3.5 pounds tension before failure.

17. The enhanced flexibility neurovascular catheter of claim 1 , wherein the neurovascular catheter is configured to withstand at least about 5 pounds tension before failure.

18. The enhanced flexibility neurovascular catheter of claim 1 , wherein the neurovascular catheter is configured to withstand at least about 7 pounds tension before failure.

19. The neurovascular catheter of claim 1 , wherein the axial length of the radiopaque marker on the first side at least about 1 mm and at most about 5 mm.

Assignees

• Incept Llc

Inventors

• Yang Yi
• Khosravi Farhad
• Young Lisa M
• Yourgenlow Ashoor Shahbazi
• Yee Brandon

Classifications

• A61B2017/22034

  for gripping the obstruction or the tissue part from inside · CPC title

• A61B2017/22001

  Angioplasty, e.g. PCTA · CPC title

• A61M25/09

  Guide wires · CPC title

• A61M25/0043

  characterised by structural features · CPC title

• A61M25/0021

  characterised by the form of the tubing (A61M25/0054 takes precedence) · CPC title