Stand-Alone Fusion Implant Secured by In-Line Fixation

Patent metadata

Field	Value
Publication number	US-2018317990-A1
Application number	US-201816026220-A
Country	US
Kind code	A1
Filing date	Jul 3, 2018
Priority date	Jan 14, 2016
Publication date	Nov 8, 2018
Grant date	—

Abstract

Stand alone fusion cage assemblies that can be secured to the adjacent vertebral bodies via an in-line approach that is substantially perpendicular to the anterior wall of the stand alone cage (or substantially parallel to the cage insertion direction).

First claim

We claim:

1 . A method of treating a spine, comprising the steps of:
i) inserting into a disc space an intervertebral fusion device having an anterior wall, a posterior wall, and first and second side walls connecting the anterior and posterior walls, an upper bearing surface and a lower bearing surface, the anterior wall having a height and an anterior surface, and a first threaded throughhole extending into the anterior wall from the anterior surface, ii) disposing into the first threaded throughole a fixation device comprising a proximal head and an intermediate flexible bellows having a helical threadform,
wherein the helical threadform threadably mates with the first threaded throughhole.

2 . The assembly of claim 1 wherein the proximal head of the device comprises an internal drive feature.

3 . The assembly of claim 1 wherein the proximal head of the device comprises an axial through hole.

4 . The assembly of claim 1 wherein the axial through hole is cylindrical.

5 . The assembly of claim 1 wherein the axial through hole is frustoconical.

6 . The assembly of claim 1 wherein the proximal head of the device is tapered and threaded.

7 . The assembly of claim 1 wherein the proximal head of the device has a peripheral groove.

8 . The assembly of claim 1 further comprising c) a guidewire extending through the fixation device.

9 . The assembly of claim 8 further comprising d) a sleeve, wherein the guide wire extends through the sleeve.

10 . The assembly of claim 9 further comprising e) a centering guide disposed in a hole in the intervertebral fusion device, wherein the sleeve extends through the centering guide.

11 . The assembly of claim 1 wherein the device further comprises a distal tip.

12 . The assembly of claim 11 wherein the distal tip has a tapered thread.

13 . The assembly of claim 11 wherein the head, bellow and tip are independent elements joined by first and second joints.

Assignees

• Depuy Synthes Products Inc

Inventors

• Mazzuca Michael

Classifications

• A61B17/8685

  comprising multiple separate parts · CPC title

• A61B17/8625 Primary

  Shanks, i.e. parts contacting bone tissue · CPC title

• A61B17/861

  specially shaped for gripping driver · CPC title

• A61B17/864

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

• A61B17/8888

  at its central region · CPC title