Lateral spondylolisthesis reduction cage

Patent metadata

Field	Value
Publication number	US-9801640-B2
Application number	US-201514919863-A
Country	US
Kind code	B2
Filing date	Oct 22, 2015
Priority date	Jun 24, 2010
Publication date	Oct 31, 2017
Grant date	Oct 31, 2017

Abstract

An intervertebral fusion device comprising inferior and superior fusion cage devices that provide an ability to correct spondylolisthesis via in-situ adjustment.

First claim

We claim:

1. A method of installing an intervertebral fusion device, wherein the device comprises:
a) an upper endplate having a proximal endwall, a distal endwall, an anterior wall, a posterior wall, an upper surface for contacting an upper vertebral body, teeth extending from the upper surface for enhancing securement, a lower surface, and a throughhole running from the upper surface to the lower surface and adapted for promoting fusion,
b) a lower endplate having a proximal endwall, a distal endwall, an anterior wall, a posterior wall, a lower surface for contacting a lower vertebral body, teeth extending from the lower surface for enhancing securement, an upper surface, and a throughhole running from the lower surface to the upper surface and adapted for promoting fusion,
c) a core component having i) an upper endportion engaged with the upper endplate and ii) a lower endportion engaged with the lower endplate, and
wherein the proximal and distal endwalls define an insertion orientation,
wherein the device has a collapsed configuration and an expanded configuration,
wherein the upper endplate does not contact the lower endplate in the expanded configuration,
wherein each of the upper endplate and the upper endportion of the core moves away from the lower surface of the lower endplate during expansion from the collapsed configuration to the expanded configuration,
wherein the upper endplate moves away from the lower endplate in a height direction during expansion from the collapsed configuration to the expanded configuration;
wherein the method comprises the steps of:
inserting the device into a disc space in the insertion orientation and in an initial insertion direction, and
expanding the inserted device from the collapsed configuration to the expanded configuration, wherein the anterior and posterior walls of the upper endplate move in a direction that is substantially transverse to the initial insertion direction and substantially transverse to the height direction during expansion from the collapsed configuration to the expanded configuration.

2. The method of claim 1 , wherein the distal endwalls of the upper and lower endplates define a taper for ease of insertion into the disc space.

3. The method of claim 1 , wherein the device further comprises:
d) a pivot at a proximal endportion of the device.

4. The method of claim 1 , wherein an external geometry of the upper and lower endplates is lordotic.

5. The method of claim 1 , wherein the upper surface of the upper endplate and the lower surface of the lower endplate are domed.

6. The method of claim 1 , wherein the anterior walls of the upper and lower endplates have a convex curve and wherein inserting the device comprises aligning the convexly curved anterior walls with the convex shape of the anterior portion of the disc space.

Assignees

• Depuy Synthes Products Inc

Inventors

• O'Neil Michael J
• Serhan Hassan
• Raymond Douglas
• Hawkins John Riley

Classifications

• A61F2/4603

  for insertion or extraction of endoprosthetic joints or of accessories thereof · CPC title

• A61M25/0133

  Tip steering devices · CPC title

• A61M29/02

  Dilators made of swellable material {(balloon catheters for angioplasty A61M25/104)} · CPC title

• A61F2/30771

  applied in original prostheses, e.g. holes or grooves · CPC title

• A61B2017/0256

  for the spine · CPC title