# US 12,599,489 B2 · Spinal cage fixable through insertion of bone screws

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- Number: US 12,599,489 B2
- Document ID: US12599489B2
- Status: Granted
- Kind: B2
- Application number: 18/795,173
- Filed: 2024-08-05
- Published: 2025-12-25
- Granted: 2026-04-14
- Earliest claimed: 2024-06-20
- Assignees: GBS Commonwealth Co., Ltd.; PMT Republic, Inc.
- Applicants: GBS Commonwealth Co., Ltd.; PMT Republic, Inc.
- Inventors: Kyoung Gee Ahn
- Web page: https://patentgrep.com/patent/US12599489B2

## 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 2002/2835: {Bone graft implants for filling a bony defect or an endoprosthesis cavity, e.g. by synthetic material or biological material}
- A61F 2002/30433: {using additional screws, bolts, dowels, rivets or washers e.g. connecting screws}
- A61F 2002/30476: {locked by an additional locking mechanism}
- A61F 2002/305: {Snap connection}
- A61F 2002/30578: {having apertures, e.g. for receiving fixation screws}
- A61F 2002/30593: {hollow}
- A61F 2002/30774: {internally-threaded}
- A61F 2002/30787: {inclined obliquely with respect to each other}
- A61F 2002/30904: {serrated profile, i.e. saw-toothed}
- A61F 2002/3092: {having an open-celled or open-pored structure}
- 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

Disclosed is a spinal cage fixable through insertion of bone screws including a cage body, a receiver disposed on a front surface of the cage body and provided with a plurality of screw holes formed therein so that the bone screws pass through the screw holes to be inserted thereinto, and a fixture coupled to the receiver adjacent to the screw holes and configured to selectively block a portion of each screw hole, wherein, when each bone screw enters a corresponding screw hole, a front end of the fixture is moved in an outward direction of the corresponding screw hole, and when insertion of each bone screw into the corresponding screw hole has been completed, the front end of the fixture is moved in an inward direction of the corresponding screw hole to prevent each bone screw from being separated from the corresponding screw hole.

## Claims

### Claim 1

A spinal cage configured to be fixed by bone screws, the spinal cage comprising:
a cage body;
a receiver disposed on a front surface of the cage body and including a plurality of screw holes for receiving the bone screws; and
a fixture coupled to the receiver, adjacent to the plurality of screw holes, and configured to selectively block a portion of each of the plurality of screw holes,
wherein, when each of the bone screws enters each of the plurality of screw holes, a front end of the fixture is moved in an outward direction of each of the plurality of screw holes, and when each bone screw is disposed in each of the plurality of screw holes, the front end of the fixture is moved in an inward direction of each of the plurality of screw holes to prevent each bone screw from being separated from each of the plurality of screw holes,
wherein the fixture comprises:
a support longitudinally coupled to an inside of the receiver;
an extension including a first extension and a second extension, the first extension extending forward from an upper portion of a front surface of the support and disposed to be orthogonal to the support, and the second extension extending forward from a lower portion of the front surface of the support and disposed to be orthogonal to the support; and
an upper and lower restraint part including an upper restraint part and a lower restraint part, the upper restraint part extending from a front end of the first extension to have an upward inclination angle, and the lower restraint part extending from a front end of the second extension to have a downward inclination angle.

### Claim 2 (depends on 1)

The spinal cage according to claim 1, wherein the receiver comprises:
a receiving body disposed in front of the cage body;
an upper protrusion protruding upward from an upper surface of the receiving body and having one or more of the plurality of screw holes; and
a lower protrusion protruding downward from a lower surface of the receiving body and having another one or more of the plurality of screw holes.

### Claim 3 (depends on 2)

The spinal cage according to claim 2, wherein:
a rear surface of the upper protrusion includes an inclined surface having a a first inclination angle with respect to a front surface of the upper protrusion such that a width of the upper protrusion in forward and rearward directions gradually decreases toward an upper end of the upper protrusion; and
a rear surface of the lower protrusion includes an inclined surface having a second inclination angle with respect to a front surface of the lower protrusion such that a width of the lower protrusion in the forward and rearward directions gradually decreases toward a lower end of the lower protrusion.

### Claim 4 (depends on 2)

The spinal cage according to claim 2, wherein a vertical height of each of the upper protrusion and the lower protrusion is 1 mm to 15 mm.

### Claim 5 (depends on 3)

The spinal cage according to claim 3, wherein each of the first and second inclination angles is 1° to 60°.

### Claim 6 (depends on 1)

The spinal cage according to claim 1, wherein:
when each bone screw enters each of the plurality of screw holes, the corresponding extension is deformed up or down and the corresponding upper or lower restraint part is moved in the outward direction of each of the plurality of screw holes; and
when each bone screw is disposed in each of the plurality of screw holes, the corresponding extension returns to an original form thereof and the corresponding upper or lower restraint part is moved in the inward direction of each of the plurality of screw holes.

### Claim 7 (depends on 1)

The spinal cage according to claim 1, wherein the receiver includes an upper area and a lower area, and wherein, among the bone screws configured to be disposed in the plurality of screw holes in the receiver, a first bone screw configured to enter a first screw hole of the plurality of first screw holes, the first screw hole disposed in the upper area, and a second bone screw configured to enter a second screw hole of the plurality of screw holes, the second screw whole disposed in the lower area, are not configured to enter at the same time and are configured to enter sequentially.

### Claim 8 (depends on 1)

The spinal cage according to claim 1,
wherein the receiver includes an upper area and a lower area, the bone screws include a first bone screw and a second bone screw and the plurality of screw holes includes a first screw hole disposed in the upper area of the receiver and a second screw hole disposed in the lower area of the receiver, and
wherein, when the first bone screw is disposed in the first screw hole, the upper restraint part prevents the first bone screw from being separated from the first screw hole, and when the second bone screw is disposed in the second screw hole, the lower restraint part prevents the second bone screw from being separated from the second screw hole.