Joint fusion instrumentation and methods

Patent metadata

Field	Value
Publication number	US-10751071-B2
Application number	US-201615137804-A
Country	US
Kind code	B2
Filing date	Apr 25, 2016
Priority date	Apr 25, 2016
Publication date	Aug 25, 2020
Grant date	Aug 25, 2020

Abstract

Systems and methods for joint preparation and fusion are disclosed. The system includes a cutting device having a handle, and rigid blade member. The blade member may include cutting edges on first and second sides, and may be curved in one or more planes. The blade member may be deployed to project outside of an outer tube, and the cutting device may be rotated to create a circular cavity. In a method of use, a cannula provides access to a procedure site such as a joint. A pathway to the joint is created, and the cutting device is inserted and deployed to undercut a cavity in the joint. A fusion device may be implanted across the joint to provide compression and fuse the joint. The system may also include instrumentation for creating access to a joint, bone graft insertion and implant insertion.

First claim

The invention claimed is:

1. A device for excising a cavity within bony tissue, the device having a proximal end and a distal end opposite the proximal end, and extending along a longitudinal device axis between the proximal and distal ends, the device comprising:
a handle assembly proximate the device proximal end and extending distally along the longitudinal device axis;
an outer tube comprising a first stop surface and extending distally from the handle assembly, a distal end of the outer tube positioned proximate the device distal end;
an actuation mechanism; and
a blade assembly comprising a blade holder having a ramped second stop surface, the blade assembly connected to the handle assembly and the actuation mechanism, and extending along the longitudinal device axis;
wherein the blade assembly comprises a blade body having a proximal end, a distal end, and first and second opposing sides extending between the blade body proximal and distal ends, the first side having a first curved cutting edge, wherein the blade body is curved in a first plane between the blade body proximal end and the blade body distal end, wherein the blade body distal end forms a U-shaped terminal curve, wherein the first curved cutting edge has a U-shape;
wherein the blade body is pivotably connected to the blade holder about a pivot pin;
wherein actuation of the actuation mechanism moves the blade body between a retracted state and a fully extended state by pivoting the blade body about the pivot pin into contact with the second stop surface;
wherein in the retracted state, the blade body is inside the outer tube;
wherein in the fully extended state, the blade body is rigidly held between and by the first and second stop surfaces in a locked position to immobilize the blade body relative to a remainder of the device and at least a portion of the blade body projects out of the outer tube proximal to the device distal end.

2. The device of claim 1 , wherein the first stop surface comprises a ramped interior distal surface of the outer tube, and wherein in a partially extended state, the blade body is configured to be essentially immobilized relative to a remainder of the device between and by the first stop surface and the bony tissue being cut.

3. The device of claim 2 , wherein the ramped second stop surface comprises a ramped exterior distal surface of the blade holder, and wherein in the fully extended state, the blade body is essentially immobilized relative to a remainder of the device between and by the first stop surface and the second stop surface.

4. The device of claim 1 , wherein the blade body is monolithic and rigid, wherein the blade body second side includes a second curved cutting edge, the first and second cutting edges facing away from one another, wherein the first and second cutting edges are parallel to one another, wherein the blade body includes a void extending between and open to the first and second opposing sides.

5. The device of claim 4 , wherein the blade body includes a first guide surface sloping from the first cutting edge toward the void to urge severed material toward the void when the device is rotated in a first direction to excise a cavity.

6. The device of claim 1 , wherein an open end of the U-shape of the first curved cutting edge is at the blade body proximal end.

7. The device of claim 6 , wherein the U-shape of the first curved cutting edge follows the U-shaped terminal curve of the blade body distal end.

8. The device of claim 1 , wherein the blade body has front and back opposing sides extending between the blade body proximal and distal ends, wherein when the blade body is viewed from the first or second side, the front side is concave and the back side is convex.

9. The device of claim 8 , wherein the U-shape of the first curved cutting edge follows the concave front side, the U-shaped terminal curve of the blade body distal end, and the convex back side.

10. The device of claim 8 , wherein the outer tube distal end comprises a lateral window, wherein in the retracted state, the blade body rests inside the window and the blade body front side faces the window.

11. A device for excising a cavity within bony tissue, the device having a proximal end and a distal end opposite the proximal end, and extending along a longitudinal device axis between the proximal and distal ends, the device comprising:
a handle assembly proximate the device proximal end and extending distally along the longitudinal device axis;
an outer tube comprising a first stop surface and extending distally from the handle assembly, a distal end of the outer tube positioned proximate the device distal end; wherein the first stop surface comprises a ramped interior distal surface of the outer tube;
a blade assembly comprising a blade holder having a ramped second stop surface, the blade assembly connected to the handle assembly and aligned with the longitudinal device axis, the blade assembly terminating proximal to the device distal end; the blade assembly comprising a blade body having a proximal end, a distal end, and first and second opposing sides extending between the blade body proximal and distal ends, the first side having a first curved cutting edge, wherein the first curved cutting edge has a U-shape when viewed from the first side; wherein the blade body is pivotably connected to the blade holder about a pivot pin; and
an actuation mechanism connected to the blade assembly, wherein the actuation mechanism controls movement of the blade body away from and toward the longitudinal device axis;
wherein upon actuation of the actuation mechanism to move the blade body away from the longitudinal device axis, the blade body is projected away from the longitudinal device axis along a curved path proximal to the device distal end, and wherein the projection of the blade body can be ceased at any point on the curved path to establish a cutting radius of the device;
wherein when the projection of the blade body is ceased in a partially extended state, the blade body is configured to be essentially immobilized relative to a remainder of the device between and by the first stop surface and the bony tissue being cut; and
wherein when the projection of the blade body is ceased in a fully extended state by pivoting of the blade body about the pivot pin into contact with the second stop surface, the blade body is rigidly held between and by the first and second stop surfaces in a locked position to immobilize the blade body relative to a remainder of the device.

12. The device of claim 11 , wherein the device cutting radius is the distance between the longitudinal device axis and the blade body distal end, wherein the cutting radius ranges from 1 mm to 35 mm.

13. The device of claim 11 , wherein the blade holder is mounted on a blade shaft coaxial with the longitudinal device axis, wherein actuation of the actuation mechanism urges the blade shaft axially along the longitudinal device axis.

14. The device of claim 13 , wherein upon actuation of the actuation mechanism to move the blade body away from the longitudinal device axis, the blade body pivots relative to the blade shaft to project away from the longitudinal device axis.

15. The device of claim 11 , wherein the blade assembly is at least partially received within the outer tube, and wherein when the blade body is projected away from the longitudinal device axis, the blade body projects out of the outer tube.

16. The device of claim 11 , wherein the blade body is monolithic and rigid, wherein the blade body second side includes a second curved cutting

Assignees

• Imds Llc
• Mayo Found Medical Education & Res

Inventors

• Rindal Björn N
• Schumacher Brian Scott
• Slater Nicholas
• Cross Iii William W

Classifications

• A61B17/864 Primary

  hollow, e.g. with socket or cannulated · CPC title

• A61B17/90

  Guides therefor · CPC title

• A61B17/1637

  Hollow drills or saws producing a curved cut, e.g. cylindrical (A61B10/025, A61B17/1695 take precedence) · CPC title

• A61F2/30988

  Other joints not covered by any of the groups A61F2/32 - A61F2/4425 · CPC title

• A61B17/1615

  Drill bits, i.e. rotating tools extending from a handpiece to contact the worked material · CPC title