Intervertebral implants, systems, and methods of use

Patent metadata

Field	Value
Publication number	US-9867718-B2
Application number	US-201414520690-A
Country	US
Kind code	B2
Filing date	Oct 22, 2014
Priority date	Oct 22, 2014
Publication date	Jan 16, 2018
Grant date	Jan 16, 2018

Abstract

An intervertebral implant frame that is configured to engage a spacer can include a pair of arms that extend longitudinally from a support member such that the arms engage the spacer. The spacer can be made from bone graft, and include a first spacer body made of cortical bone, and a second spacer body made of cancellous bone.

First claim

What is claimed:

1. An intervertebral implant configured to be inserted into an intervertebral space, the intervertebral implant comprising:
a spacer including:
a cortical spacer body comprising a cortical bone graft material;
a cancellous spacer body comprising a cancellous bone graft material, the cancellous spacer body disposed proximal with respect to at least a portion of the cortical spacer body,
wherein the spacer defines a proximal end that comprises the cancellous spacer body and none of the cortical spacer body, and a distal end that is spaced from the proximal end in a distal direction, the distal end comprising the cortical spacer body and none of the cancellous spacer body; and

a frame including a support member disposed proximal with respect to the cancellous spacer body and configured to extend along a portion of the cancellous spacer body, such that the cancellous spacer body is disposed between the support member and the at least a portion of the cortical spacer body,
wherein the frame defines at least one fixation element receiving aperture that extends through the support member, such that a fixation element inserted through the fixation element receiving aperture toward the spacer travels from the support member and through the cancellous bone graft material without passing through any of the cortical bone graft material.

2. The intervertebral implant as recited in claim 1 , wherein the frame further includes first and second opposed arms that extend from the support member and are configured to engage the cortical spacer body.

3. The intervertebral implant as recited in claim 2 , wherein the frame includes at least one retention member that extends from the first arm along a direction toward the second arm, and at least one retention member that extends out from the second arm along a direction toward the first arm, and the cortical spacer body is configured to receive the retention members so as to attach the frame to the spacer.

4. The intervertebral implant as recited in claim 3 , wherein the cortical spacer body defines at least one groove sized to receive the at least one retention member.

5. The intervertebral implant as recited in claim 3 , wherein the at least one retention member is configured to bite into the cortical spacer body so as to create a recess that retains the at least one retention member.

6. The intervertebral implant as recited in claim 1 , wherein the spacer includes opposed side surfaces spaced from each other along a lateral direction that is perpendicular to the distal direction,
wherein the intervertebral implant is configured for insertion in the distal direction, wherein the distal direction is oriented along a lateral approach, an anterior-posterior approach, or an oblique approach into the intervertebral space.

7. The intervertebral implant as recited in claim 6 , wherein the distal end has a width along the lateral direction from one of the side surfaces to the other of the side surfaces, the proximal end has a width along the lateral direction from one of the side surfaces to the other of the side surfaces, and the width of the distal end is less than the width of the proximal end.

8. The intervertebral implant as recited in claim 1 , wherein the frame defines four fixation element receiving apertures that extend through the support member, such that four fixation elements that are inserted through respective ones of the four fixation element receiving apertures and pass entirely through the spacer travel through the cancellous bone graft material without passing through any of the cortical bone graft material.

9. An intervertebral implant assembly comprising:
the intervertebral implant as recited in claim 8 ; and
the fixation elements as recited in claim 8 .

10. The intervertebral implant as recited in claim 1 , wherein the at least one fixation element receiving aperture comprises a plurality of fixation element receiving apertures that extends through the support member, and all fixation elements that are inserted through respective ones of the fixation element receiving apertures pass entirely through the spacer travel through the cancellous bone graft material without passing through any of the cortical bone graft material.

11. An intervertebral implant comprising:
a spacer including a cortical spacer body that comprises a cortical bone graft material, and a cancellous spacer body that comprises a cancellous bone graft material; and
a frame including a support member configured to extend along a portion of the cancellous spacer body, the frame further including first and second opposed arms that extend from the support member and are configured to engage the cortical spacer body;
wherein the frame defines at least one fixation element receiving aperture that extends through the support member, such that a fixation element inserted through the fixation element receiving aperture toward the spacer travels from the support member and through the cancellous bone graft material without passing through any of the cortical bone graft material, and
wherein the spacer defines a proximal end surface and a distal end surface opposite the proximal end surface in a distal direction, the proximal end surface comprising the cancellous spacer body and none of the cortical spacer body, and the distal end surface comprising the cortical spacer body and none of the cancellous spacer body.

12. The intervertebral implant as recited in claim 11 , wherein 1) the spacer defines a top surface that extends from the proximal end surface to the distal end surface, and a bottom surface opposite the top surface, the bottom surface extending from the proximal end surface to the distal end surface, 2) the at least one fixation element creates at least one channel in the cancellous spacer body after it extends through the at least one fixation element receiving aperture, and 3) the at least one channel defines a first opening in the proximal end surface and a second opening in the top surface.

13. The intervertebral implant as recited in claim 12 , wherein the spacer further defines a pair of opposed side surfaces that extend between the proximal end surface and the distal end surface, the opposed side surfaces spaced from each other along a lateral direction, the distal end surface has a width along the lateral direction from one of the side surfaces to the other of the side surfaces, the proximal end surface has a width along the lateral direction from one of the side surfaces to the other of the side surfaces, and the width of the distal end is less than the width of the proximal end.

14. The intervertebral implant as recited in claim 12 , wherein the first opening is completely encircled by the proximal end surface.

15. The intervertebral implant as recited in claim 12 , wherein the at least one channel is open at an intersection of the proximal end surface and the top surface.

16. The intervertebral implant as recited in claim 12 , wherein the at least one channel is open at an intersection of the proximal end surface and the bottom surface.

17. An intervertebral implant assembly comprising:
a spacer including a cortical spacer body comprising a cortical bone graft material, and a cancellous spacer body comprising a cancellous bone graft material, wherein the cortical spacer body at least partially surrounds the cancellous spacer body, such that a proximal end of the spacer comprises the cancellous spacer body and none of the cortical spacer body, and a distal end of the spacer comprises the cortical spacer body and none of the cancellous spa

Assignees

• Depuy Synthes Products Inc

Inventors

• Schmura Kurt
• Chan Edwin
• Chronister Benjamin
• Murphy Raymond
• Jacene Michael

Classifications

• A61F2002/30904

  serrated profile, i.e. saw-toothed · CPC title

• A61B17/86

  Pins or screws {or threaded wires; nuts therefor (A61B17/72 take precedence)} · CPC title

• A61F2310/00359

  Bone or bony tissue · CPC title

• A61F2002/30774

  internally-threaded · CPC title

• A61F2/447 Primary

  substantially parallelepipedal, e.g. having a rectangular or trapezoidal cross-section · CPC title