SUBINTIMAL RE-ENTRY CATHETER WITH SHAPE CONTROLLED BALLOON

• US 20140277053A1
• Filed: 03/11/2014
• Published: 09/18/2014
• Est. Priority Date: 03/14/2013
• Status: Active Application

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Inventors: Wang, Huisun, Zhou, Pu, Gundale, Benjamin, Horn, Daniel, Chen, John
• Granted Patent: US 10,258,770 B2
• Time in Patent Office: Days
• US Class Current: 606/185
• CPC Class Codes: A61B 17/3207 Atherectomy devices working by cutting or abrading; Similar devices specially adapted for non-vascular obstructions A61B17/32037 takes precedence; endoscopic cutting instruments A61B17/320016
• CPC Class Codes: A61B 2017/22044 with a pointed tip
• CPC Class Codes: A61B 2017/22068 Centering
• CPC Class Codes: A61B 2017/22071 Steering
• CPC Class Codes: A61B 2017/22095 accessing a blood vessel true lumen from the sub-intimal space
• CPC Class Codes: A61M 2025/0095 being one or more needles protruding from the distal tip and which are not used for injection nor for electro-stimulation, e.g. for fixation purposes
• CPC Class Codes: A61M 2025/0197 for creating an artificial passage within the body, e.g. in order to go around occlusions
• CPC Class Codes: A61M 2025/1059 having different inflatable sections mainly depending on the response to the inflation pressure, e.g. due to different material properties with different compartments A61M2025/1072
• CPC Class Codes: A61M 2025/1084 having features for increasing the shape stability, the reproducibility or for limiting expansion, e.g. containments, wrapped around fibres, yarns or strands
• CPC Class Codes: A61M 25/0194 Tunnelling catheters
• CPC Class Codes: A61M 25/1002 characterised by balloon shape A61M25/1006, A61M25/1009 take precedence
• CPC Class Codes: A61M 25/104 used for angioplasty

Abstract

A recanalization catheter for facilitating re-entry into a lumen of a blood vessel from a subintimal space. The catheter includes an inflatable balloon mounted on a distal end region of the catheter shaft of the catheter. The catheter shaft includes a guidewire lumen having a distal opening and a lateral opening in a distal region of the catheter shaft proximal of the distal opening, and an inflation lumen in fluid communication with the balloon. The balloon is configured to be inflated in the subintimal space to a first inflation state at inflation pressures below a threshold inflation pressure to orient the lateral opening toward the lumen of the blood vessel, and inflated to a second inflation state at inflation pressures above the threshold inflation pressure. The catheter includes means for retaining the balloon in the first inflation state at pressures below the threshold inflation pressure.

Claims

1. A recanalization catheter for facilitating re-entry into a lumen of a blood vessel from a subintimal space, comprising:

an inflatable balloon; and

an elongate shaft extending distally from a hub assembly along a longitudinal axis to the inflatable balloon, the elongate shaft including;

a guidewire lumen having a distal opening and a lateral opening in a distal region of the elongate shaft proximal of the distal opening; and

an inflation lumen in fluid communication with the inflatable balloon;

wherein the inflatable balloon is configured to be inflated in the subintimal space to a first inflation state at inflation pressures below a threshold inflation pressure and inflated to a second inflation state at inflation pressures above the threshold inflation pressure; and

wherein the inflatable balloon is configured to orient the lateral opening toward the lumen of the blood vessel when the inflatable balloon is inflated to the first inflation state.

2. The recanalization catheter of claim 1, wherein the inflatable balloon includes a first segment configured to be oriented radially toward the lumen of the blood vessel from the longitudinal axis in the first inflation state, a second segment configured to be oriented radially away from the lumen of the blood vessel from the longitudinal axis, and third and fourth segments interposed between the first and second segments;

wherein in the first inflation state the third and fourth segments are located further from the longitudinal axis than the first and second segments.

3. The recanalization catheter of claim 2, wherein in the first inflation state the inflatable balloon has a flattened cross-sectional profile, and in the second inflation state the inflatable balloon has a circular cross-sectional profile.

4. The recanalization catheter of claim 2, wherein in the second inflation state the first, second, third and fourth segments are located about equidistantly from the longitudinal axis.

5. The recanalization catheter of claim 2, wherein the third and fourth segments are configured to have a first radius of curvature in the first inflatable state and a second radius of curvature greater than the first radius of curvature in the second inflatable state when the inflatable balloon is inflated to an inflation pressure above the threshold inflation pressure.

6. The recanalization catheter of claim 5, wherein the first and second segments are configured to have a first radius of curvature in the first inflatable state and a second radius of curvature less than the first radius of curvature in the second inflatable state when the inflatable balloon is inflated to an inflation pressure above the threshold inflation pressure.

7. The recanalization catheter of claim 2, wherein the first and second segments are attached to a guidewire tube of the elongate shaft extending through the inflatable balloon in the first inflation state;

and

wherein the first and second segments are configured to be detached from the guidewire tube when the inflatable balloon is inflated to an inflation pressure above the threshold inflation pressure.

8. A recanalization catheter for facilitating re-entry into a lumen of a blood vessel from a subintimal space, comprising:

an elongate shaft extending distally from a hub assembly;

an inflatable balloon mounted on a distal region of the elongate shaft, the inflatable balloon configured to be inflated in the subintimal space to a first inflation state at inflation pressures below a threshold inflation pressure and inflated to a second inflation state at inflation pressures above the threshold inflation pressure; and

means for retaining the inflatable balloon in the first inflatable state until the inflatable balloon is inflated to an inflation pressure above the threshold inflation pressure.

9. The recanalization catheter of claim 8, wherein in the first inflation state the inflatable balloon has a flattened cross-sectional profile, and in the second inflation state the inflatable balloon has a circular cross-sectional profile.

10. The recanalization catheter of claim 9, wherein the means for retaining the inflatable balloon in the first inflatable state comprises:

first and second bonding portions on an interior surface of the inflatable balloon being bonded to a guidewire tube of the elongate shaft extending through the inflatable balloon in the first inflation state;

wherein the first and second bonding portions are configured to be unbonded from the guidewire tube when the inflatable balloon is inflated to an inflation pressure above the threshold inflation pressure.

11. The recanalization catheter of claim 9, wherein the means for retaining the inflatable balloon in the first inflatable state comprises:

one or more interior struts extending between the balloon and a guidewire tube of the elongate shaft extending through the inflatable balloon in the first inflation state;

wherein the one or more interior struts are configured to broken from the guidewire tube and/or the inflatable balloon when the inflatable balloon is inflated to an inflation pressure above the threshold inflation pressure.

12. The recanalization catheter of claim 9, wherein the means for retaining the inflatable balloon in the first inflatable state comprises:

first and second curved segments of the inflatable balloon having a first thickness; and

third and fourth curved segments of the inflatable balloon interposed between the first and second curved segments, the third and fourth curved segments having a second thickness greater than the first and second curved segments;

wherein the third and fourth curved segments are configured to have a first radius of curvature in the first inflatable state and a second radius of curvature greater than the first radius of curvature in the second inflatable state when the inflatable balloon is inflated to an inflation pressure above the threshold inflation pressure.

13. The recanalization catheter of claim 9, wherein the means for retaining the inflatable balloon in the first inflatable state comprises:

first and second curved segments of the inflatable balloon having a first stiffness; and

third and fourth curved segments of the inflatable balloon interposed between the first and second curved segments, the third and fourth curved segments having a second stiffness different than the first and second curved segments;

wherein the third and fourth curved segments are configured to have a first radius of curvature in the first inflatable state and a second radius of curvature greater than the first radius of curvature in the second inflatable state when the inflatable balloon is inflated to an inflation pressure above the threshold inflation pressure.

14. The recanalization catheter of claim 9, wherein the means for retaining the inflatable balloon in the first inflatable state comprises:

a first longitudinal stiffening member extending along the inflatable balloon; and

a second longitudinal stiffening member extending along the inflatable balloon opposite the first longitudinal stiffening member;

wherein the first and second longitudinal stiffening members are configured to elastically yield when the inflatable balloon is inflated to an inflation pressure above the threshold inflation pressure.

15. The recanalization catheter of claim 8, wherein the threshold inflation pressure is in the range of about 4-6 ATM.

16. The recanalization catheter of claim 8, wherein the inflatable balloon is configured to be in the first inflation state at inflation pressures between 2-4 ATM.

17. The recanalization catheter of claim 16, where the inflatable balloon is configured to be in the second inflation state at inflation pressures greater than 6 ATM.

18. A method of recanalizing a blood vessel having an occlusion therein, the method comprising:

advancing a distal region of a catheter shaft including an inflatable balloon mounted thereon into a subintimal space between a first tissue layer and a second tissue layer of a wall of a blood vessel;

inflating the inflatable balloon to a first inflation state in the subintimal space by inflating the inflatable balloon to a first inflation pressure below a threshold inflation pressure to orient a lateral port in the distal region of the catheter shaft toward a lumen of the blood vessel distal of the occlusion;

advancing a penetration member from the lateral port of the catheter shaft to penetrate through the first tissue layer into the lumen of the blood vessel; and

thereafter, inflating the inflatable balloon to a second inflation state different from the first inflation state by inflating the inflatable balloon to a second inflation pressure above the threshold inflation pressure to expand the subintimal space.

19. The method of claim 18, wherein in the first inflation state the inflatable balloon has a flattened cross-sectional profile, and in the second inflation state the inflatable balloon has a circular cross-sectional profile.

20. The method of claim 18, wherein inflating the inflatable balloon to the second inflation state causes first and second segments of the inflatable balloon to be detached from a guidewire tube of the catheter shaft extending through the inflatable balloon when the inflatable balloon is inflated to the second inflation pressure above the threshold inflation pressure.