Atherectomy catheter with laterally-displaceable tip

Patent metadata

Field	Value
Publication number	US-11717314-B2
Application number	US-201816105743-A
Country	US
Kind code	B2
Filing date	Aug 20, 2018
Priority date	Jul 1, 2009
Publication date	Aug 8, 2023
Grant date	Aug 8, 2023

Abstract

Described herein are atherectomy catheters, systems and methods that include a distal tip region that may be moved laterally so that its long axis is parallel with the long axis of the main catheter body axis. Displacing the distal tip region laterally out of the main catheter body axis exposes an annular blade and opens a passageway for cut tissue to enter a storage region within the catheter. The annular blade may be internally coupled to a drive shaft that rotates the blade, and thus the exposed blade edge may have the same crossing profile (OD) as the rest of the distal end region of the catheter. Also described herein are gear-driven atherectomy devices that may use a cable drive shaft to actuate the annular blade. Both push-to-cut and pull-to-cut variations are described, as are methods for cutting tissue and systems including these atherectomy catheters.

First claim

What is claimed is:

1. An atherectomy catheter device comprising:
an elongate catheter body with a longitudinal axis;
a driveshaft extending along a length of the elongate catheter body;
an annular cutting ring attached to the driveshaft, the annular cutting ring configured to rotate about a long axis and having a distal cutting edge;
a distal tip assembly coupled to a distal end of the elongate catheter body; and
an optical coherence tomography (OCT) sensor comprising a side-facing OCT emitting element corresponding to a distal end of a fiber, the fiber extending along the length of the elongate catheter body, the distal end of the fiber attached to the elongate catheter body in a position proximal to the distal cutting edge;
wherein the driveshaft is configured to move axially to cause the distal tip assembly to deflect relative to the longitudinal axis of the elongate catheter body to expose the distal cutting edge, wherein the annular cutting ring is configured to displace radially relative to the distal end of the elongate catheter body to radially extend the distal cutting edge relative to the distal end of the elongate catheter body, and wherein the long axis of the annular cutting ring is configured to be parallel to a longitudinal axis of the distal tip assembly when the distal tip assembly is deflected.

2. The atherectomy catheter device of claim 1 , wherein the OCT sensor is configured to obtain angular survey images of a vessel lumen through an imaging window when the atherectomy catheter device is inserted into the vessel lumen.

3. The atherectomy catheter device of claim 1 , wherein the annular cutting ring is configured to remain in-line with the elongate catheter body when the distal tip assembly is deflected.

4. The atherectomy catheter device of claim 1 , further comprising a handle attached to a proximal end of the elongate catheter body, wherein the handle includes a control that is configured to move the driveshaft axially.

5. The atherectomy catheter device of claim 1 , further comprising a balloon mounted on a circumference of the elongate catheter body.

6. The atherectomy catheter device of claim 5 , wherein the balloon is configured to inflate to urge the distal cutting edge into tissue of a vessel lumen when the atherectomy catheter device is positioned within the vessel lumen.

7. The atherectomy catheter device of claim 1 , wherein the driveshaft comprises a hollow tubular drive shaft having a lumen, the fiber extending within the lumen.

8. The atherectomy catheter device of claim 1 , further comprising a guidewire lumen extending the length of the elongate catheter body.

9. The atherectomy catheter device of claim 1 , wherein the annular cutting ring forms an outer surface of the atherectomy catheter device both when the distal tip assembly is deflected and when the distal tip assembly is not deflected.

10. The atherectomy catheter device of claim 1 , further comprising an internal tissue collection region configured to receive tissue cut by the annular cutting ring.

11. The atherectomy catheter device of claim 10 , wherein the internal tissue collection region is located within the distal tip assembly.

12. The atherectomy catheter device of claim 1 , wherein the side-facing OCT emitting element is on a proximal side axially to the distal cutting edge of the annular cutting ring.

13. The atherectomy catheter device of claim 1 , wherein the side-facing OCT emitting element remains radially fixed with respect to the annular cutting ring as the distal tip assembly is deflected and the distal cutting edge is exposed.

14. The atherectomy catheter device of claim 1 , wherein the distal tip assembly is parallel to the longitudinal axis of the elongate catheter body when the distal tip assembly is deflected.

15. The atherectomy catheter device of claim 1 , wherein deflection of the distal tip assembly increases a size of an opening that provides access to a tissue storage reservoir of the device.

Assignees

• Avinger Inc

Inventors

• Rosenthal Michael H
• Zung Michael
• Spinelli Nicholas J
• Mcnall Charles W
• Simpson John B
• Black John F

Classifications

• A61B17/320758 Primary

  with a rotating cutting instrument, e.g. motor driven (A61B17/320725, A61B17/32075 and A61B17/320783 take precedence; for removing intra-ocular material A61F9/00763; endoscopic rotatable cutting instruments A61B17/32002) · CPC title

• A61B17/32075

  Pullback cutting; combined forward and pullback cutting, e.g. with cutters at both sides of the plaque · CPC title

• A61B90/361

  Image-producing devices, e.g. surgical cameras · CPC title

• A61M25/0074

  Dynamic characteristics of the catheter tip, e.g. openable, closable, expandable or deformable · CPC title

• A61M25/0133

  Tip steering devices · CPC title