EP-4740912-A1 - INTERVERTEBRAL BODY FUSION PROSTHESIS

EP4740912A1EP 4740912 A1EP4740912 A1EP 4740912A1EP-4740912-A1

Abstract

An intervertebral fusion cage is provided. The intervertebral fusion cage according to an aspect of the present invention comprises: a screw including a screw head and a screw body which extends from the screw head in a first direction and has a screw thread on an outer circumferential surface thereof; a main body including a screw housing in which the screw head is rotatably accommodated and which has a through-portion penetrating in a second direction inclined with respect to the first direction, and a base plate which is disposed on one surface of the screw housing at the second-direction side and has a base hole in communication with the through-portion; a guide member including a guide body in which the screw housing is accommodated and to which the screw body is rotatably coupled, the guide member being movable relative to the main body in a direction parallel to the first direction according to rotation of the screw; a moving plate movably connected to the main body and displaced according to relative movement between the main body and the guide member; and at least one bar-type member disposed across the through-portion.

Inventors

JUNG, UI SU
CHO, SAMUEL

Assignees

CG Bio Co., Ltd.
INNOTEAM.INC

Dates

Publication Date: 20260513
Application Date: 20240702

Claims (12)

An intervertebral fusion cage, comprising: a screw including a screw head and a screw body which extends from the screw head in a first direction and has a screw thread on an outer circumferential surface of the screw body; a main body including a screw housing in which the screw head is rotatably accommodated and which has a through-portion penetrating in a second direction inclined with respect to the first direction, and a base plate which is disposed on one surface of the screw housing on the second-direction side and has a base hole in communication with the through-portion; a guide member including a guide body in which the screw housing is accommodated and to which the screw body is rotatably coupled, the guide member being movable relative to the main body in a direction parallel to the first direction according to rotation of the screw; a moving plate movably connected to the main body and displaced according to relative movement between the main body and the guide member; and at least one bar-type member disposed across the through-portion.
The intervertebral fusion cage of claim 1, wherein the bar-type member is disposed at an end of the through-portion on the second-direction side.
The intervertebral fusion cage of claim 3, wherein the bar-type member is disposed to extend across the through-portion along the first direction.
The intervertebral fusion cage of claim 1, wherein a plurality of the bar-type members are arranged in parallel with each other.
The intervertebral fusion cage of claim 1, wherein a plurality of the bar-type members are spaced apart from each other and disposed at positions having different heights.
The intervertebral fusion cage of claim 1, wherein a plurality of the bar-type members are provided, and at least two of the bar-type members are disposed such that at least a portion thereof overlap with each other when viewed in the second direction.
The intervertebral fusion cage of claim 1, wherein the base plate comprises at least one resistance protrusion formed to protrude on the one surface on the second-direction side, and the resistance protrusion extends in a third direction perpendicular to the first direction.
The intervertebral fusion cage of claim 7, wherein a plurality of the resistance protrusions are formed, at least one of the resistance protrusions is formed on a portion of the one surface of the base plate on the second-direction side where the base hole is not located, and at least one of the resistance protrusions is formed such that an end portion of the resistance protrusion extends across the base hole along the third direction.
The intervertebral fusion cage of claim 3, wherein a porous member made of a porous material is provided in the base hole.
The intervertebral fusion cage of claim 9, wherein the porous member is provided in a shape corresponding to the shape of the base hole.
The intervertebral fusion cage of claim 1, wherein the second direction is formed at an angle perpendicular to the first direction, and an area of a cross section obtained by cutting the base hole in a direction perpendicular to the second direction is larger than an area of a cross section obtained by cutting an end portion of the through-portion on the second-direction side in the direction perpendicular to the second direction.
The intervertebral fusion cage of claim 1, wherein the moving plate comprises at least one upper resistance protrusion formed to protrude on one surface thereof farthest from the base plate, and the upper resistance protrusion extends in a third direction perpendicular to the first direction.

Description

TECHNICAL FIELD The present invention relates to an intervertebral fusion cage, and more particularly, to an intervertebral fusion cage applicable to an implant requiring in-body expansion. BACKGROUND An intervertebral fusion cage is a device used in spinal fusion, which is a surgical treatment method for spinal disorders. When a disc ruptures or weakens due to a disease or accident, the spinal nerve may be compressed, causing pain. In such a case, the damaged disc is removed, and spinal fusion is performed by inserting an intervertebral fusion cage into the intervertebral space from which the damaged disc has been removed, to restore and maintain the intervertebral spacing and lordosis. As described above, the intervertebral fusion cage is inserted into the intervertebral space between vertebral bodies from which a degenerative disc has been removed, thereby providing a space for bone growth required for fusion. In addition, the intervertebral fusion cage alleviates pain by securing an appropriate spacing between the vertebral bodies and restores spinal stability. Generally, intervertebral fusion cages are individually manufactured according to the lordosis and height of the spine. However, during surgery performed through a posterior approach to the spine, it is often difficult to use an intervertebral fusion cage having the lordosis and height required for a patient. This is because most patients who require spinal fusion experience degenerative changes in the spine, making it difficult to secure sufficient space for inserting the intervertebral fusion cage. In this situation, expandable intervertebral fusion cages have been introduced, which have a low height at the time of implantation to allow easy insertion into the disc space and can expand the lordosis or height after being positioned at a desired location. However, most of the conventional expandable intervertebral fusion cages are configured to expand only one of the lordosis or the height, rather than both. In conventional cases, to promote bone formation, a bone graft material was filled after the installation of the intervertebral fusion cage. However, such a bone graft material focused on promoting bone growth and did not contribute to structural stability against external forces. After implantation, the intervertebral fusion cage is used long-term in an expanded state as the patient's bone grows inside it. Since the process of bone formation is guided by the position and shape of the bone graft material and the intervertebral fusion cage, it is very important to secure structural stability so that the implanted intervertebral fusion cage can maintain its rigidity during long-term use and throughout the bone formation process. Accordingly, there is a growing need to develop an intervertebral fusion cage that can adjust both the lordosis and the height, operate stably, and maintain a rigid structure during the process of bone formation and maintenance while also promoting bone growth. DISCLOSURE TECHNICAL PROBLEM The present invention has been made to solve the problems described above, and an object of the present invention is to provide an intervertebral fusion cage capable of adjusting both the lordosis and the height through a driving mechanism that converts motion between nonlinear and linear movements. Another object of the present invention is to provide an intervertebral fusion cage capable of maintaining a rigid structure even after implantation, expansion, and fixation. Still another object of the present invention is to provide an intervertebral fusion cage that can enhance the efficiency of bone formation and fusion while maintaining structural rigidity. The technical problems of the present invention are not limited to those described above, and other problems not mentioned herein will be clearly understood by those skilled in the art from the following description. TECHNICAL SOLUTION According to an aspect of the present invention, provided is an intervertebral fusion cage, comprising: a screw including a screw head and a screw body which extends from the screw head in a first direction and has a screw thread on an outer circumferential surface of the screw body; a main body including a screw housing in which the screw head is rotatably accommodated and which has a through-portion penetrating in a second direction inclined with respect to the first direction, and a base plate which is disposed on one surface of the screw housing on the second-direction side and has a base hole in communication with the through-portion; a guide member including a guide body in which the screw housing is accommodated and to which the screw body is rotatably coupled, the guide member being movable relative to the main body in a direction parallel to the first direction according to rotation of the screw; a moving plate movably connected to the main body and displaced according to relative movement between the main body and the guide member; and at l