# US 12,109,125 B2 · Intervertebral fusion cage implant and surgical procedure therefor

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- Number: US 12,109,125 B2
- Document ID: US12109125B2
- Status: Granted
- Kind: B2
- Application number: 17/594,857
- Filed: 2021-08-24
- Published: 2022-09-29
- Granted: 2024-10-08
- Earliest claimed: 2020-08-26
- Assignees: Signature Orthopaedics Europe Ltd
- Applicants: Signature Orthopaedics Europe Ltd
- Inventors: Declan Brazil; Andrew Roginsky; David Edis
- Web page: https://patentgrep.com/patent/US12109125B2

## CPC

- A61F 2/4455: {for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion cages (intervertebral discs A61F2/442)}
- A61F 2/447: {substantially parallelepipedal, e.g. having a rectangular or trapezoidal cross-section}
- A61F 2002/30187: {D-shaped or half-disc-shaped}
- A61F 2002/30227: {arched, domed or vaulted}
- A61F 2002/30322: {differing in surface structures}
- A61F 2002/30593: {hollow}
- A61F 2002/30774: {internally-threaded}
- A61F 2002/30777: {Oblong apertures}
- A61F 2002/30785: {parallel}
- A61F 2002/30795: {Blind bores, e.g. of circular cross-section}
- A61F 2002/308: {oblong}
- A61F 2002/30828: {parallel}
- A61F 2002/30904: {serrated profile, i.e. saw-toothed}
- A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C)

## Abstract

An intervertebral fusion cage implant is generally elongate and defines superior and inferior bearing surfaces. The inferior bearing surface has vertebral body engaging interferences and the superior bearing surface has a substantially smooth surface profile, sagittal plane convexity and sagittal plane curvature asymmetry. The sagittal plane convexity defines a saggital plane axis rising anteriorly with respect to a horizontal saggital plane axis. The superior bearing surface defines a central section having coronal plane convexity and lateral sections adjacent the central section.

## Claims

### Claim 1

An intervertebral fusion cage implant, comprising:
the intervertebral fusion case implant being elongate; and
defining superior and inferior bearing surfaces,
the inferior bearing surface having vertebral body engaging interferences; and
the superior bearing surface having:
a smooth surface profile;
sagittal plane convexity, the sagittal plane convexity defining a sagittal plane axis rising anteriorly with respect to a horizontal sagittal plane axis; and
sagittal plane curvature asymmetry, wherein:
the superior bearing surface defines a central section having coronal plane convexity and
lateral sections adjacent the central section and wherein the implant is sized so that the central section bears against a central endplate of an adjacent vertebra in use and the lateral sections bear against opposite sides of an epiphyseal rim of the adjacent vertebra in use.

### Claim 2 (depends on 1)

The implant as claimed in claim 1, wherein the interferences comprise longitudinal serrations.

### Claim 3 (depends on 2)

The implant as claimed in claim 2, wherein the serrations run mediolaterally.

### Claim 4 (depends on 2)

The implant as claimed in claim 2, wherein each serration defines an anterior edge which is at a greater angle with respect to a transverse plane of the implant as compared to a posterior edge thereof.

### Claim 5 (depends on 1)

The implant as claimed in claim 1, wherein the implant is wider in a sagittal plane of the implant towards an anterior surface of the implant as compared to towards a posterior surface of the implant.

### Claim 6 (depends on 1)

The implant as claimed in claim 1, wherein surfaces of the lateral sections extend parallel with respect to a transverse plane of the implant.

### Claim 7 (depends on 1)

The implant as claimed in claim 1, wherein surfaces of the lateral sections rise laterally with respect to a transverse plane of the implant.

### Claim 8 (depends on 1)

The implant as claimed in claim 1, wherein the inferior bearing surface defines a central section having coronal plane convexity and inferior lateral sections adjacent the central section.

### Claim 9 (depends on 8)

The implant as claimed in claim 8, wherein surfaces of the inferior lateral sections extend parallel with respect to a transverse plane of the implant.

### Claim 10 (depends on 8)

The implant as claimed in claim 8, wherein surfaces of the inferior lateral sections rise laterally with respect to a transverse plane of the implant.

### Claim 11 (depends on 1)

The implant as claimed in claim 1, wherein the superior and inferior bearing surfaces are parallel in a coronal plane of the implant at the lateral sections of the superior bearing surface and at lateral sections of the inferior bearing surface, respectively.

### Claim 12 (depends on 1)

The implant as claimed in claim 1, further comprising at least one osseointegration cavity open between the superior and inferior bearing surfaces.

### Claim 13 (depends on 12)

The implant as claimed in claim 12, wherein the implant comprises a pair of laterally spaced osseointegration cavities.

### Claim 14 (depends on 13)

The implant as claimed in claim 13, wherein the superior bearing surface has sagittal plane continuity between the laterally spaced osseointegration cavities.

### Claim 15 (depends on 13)

The implant as claimed in claim 13, wherein the osseointegration cavities are rectangular in a transverse plane of the implant.

### Claim 16 (depends on 1)

The implant as claimed in claim 1, wherein the implant defines anterior and posterior surfaces and wherein the anterior and posterior surfaces are planar.

### Claim 17 (depends on 1)

The implant as claimed in claim 1, further comprising at least one threaded placement instrument socket through a lateral side of the implant.

### Claim 18 (depends on 17)

The implant as claimed in claim 17, wherein a first threaded placement instrument socket extends laterally along a lateral plane of the implant and a second placement instrument socket extends more anteriorly than the first threaded placement instrument socket.

### Claim 19 (depends on 1)

The implant as claimed in claim 1, wherein surfaces of the lateral sections of the superior bearing surface are not colinear in a coronal plane of the implant.

### Claim 20 (depends on 19)

The implant as claimed in claim 19, wherein the surfaces of the lateral sections of the superior bearing surface rise in a lateral plane of the implant.