KR102226568B1 - Porous Spinal Cage with Minimized Solid Part - Google Patents

Abstract

The present invention relates to a porous intervertebral fusion prosthesis material with a minimized solid portion, and more particularly, to increase the ratio of the porous portion by removing unnecessary solid portions, thereby promoting the fusion between the implant and the bone, the solid portion is minimized. It relates to a porous intervertebral fusion prosthesis.

Description

Porous Spinal Cage with Minimized Solid Part}

The present invention relates to a porous intervertebral fusion prosthesis material with a minimized solid portion, and more particularly, to increase the ratio of the porous portion by removing unnecessary solid portions, thereby promoting the fusion between the implant and the bone, the solid portion is minimized. It relates to a porous intervertebral fusion prosthesis.

The spine, which forms the longitudinal axis of the body's trunk, consists of 7 cervical vertebra, 12 thoracic vertebra, 5 lumbar vertebra, 5 sacrum, and 4 coccyx. A vertebral bone consisting of; It is also called an intervertebral disc and consists of a vertebral disc, a disc-shaped cartilage structure that connects the vertebral bones to the vertebral bones.

In general, the vertebral disc absorbs the load and shock of the body between the vertebral bones, acts as a buffer to distribute the shock like a spring, holds the vertebral bones so that they do not dislodge, and separates the two vertebral bones so that the vertebral nerves are not compressed. It smoothes the range of the vertebral joints and smoothes the movement of each of the vertebral bones.

Such a human spinal disc is usually composed of a fibrous ring and a nucleus. If the water in the water balloon is the nucleus, the fibrous ring corresponds to a hot air balloon containing water.

If you suffer from degenerative disc disease, the movement of the fibrous ring or the ability to contain the nucleus is weakened, and the water content of the vertebral disc decreases, resulting in spinal stenosis, osteophyte formation, and disc herniation. Lumbar Herniated Intervertebral Disc) and nerve root compression.

As a method for treating such diseases related to vertebral discs, a method of replacing the space between two adjacent vertebral bodies with intervertebral fusion prostheses is used after removing the intervertebral discs of the injured human body. This is the implantation of an artificial disc in a human body, and the original height of the intervertebral disc, which is the original distance between two adjacent vertebral bodies, is restored to restore the function of the spine.

The intervertebral fusion prosthesis has an appropriate thickness and an anatomical shape (Anatomic Type) to restore the original height of the intervertebral disc, and a hole is formed on the inside to insert a bone graft to grow bone. It facilitates and has a form having a mounting hole for mounting to the insertion tool.

Depending on the direction of insertion of the intervertebral fusion prosthesis during surgery, Posterior Lumbar Interbody Fusion (PLIF), Transforaminal Lumbar Interbody Fusion (TLIF), Anterior Lumbar Interbody Fusion, ALIF), and Direct Lateral Interbody Fusion (DLIF).

1 is a view of a conventional intervertebral fusion prosthesis 90, which is disclosed in US published patent publication US 2017/0216036 A1 (2017.08.03). Referring to Figure 1, in the case of the known intervertebral fusion prosthesis 90, the entire intervertebral fusion prosthesis is configured to be patient-specific using a 3D printing technology, etc., and the inner side of the intervertebral fusion prosthesis material There is a feature that constitutes the hole 91 into which the bone graft can be inserted.

Since the intervertebral fusion prosthesis 90 has numerous voids formed throughout the intervertebral fusion prosthesis, there is an advantage of being able to greatly promote the growth of the patient's autogenous bone by entering the space between neighboring vertebral bones.

However, in the case of the intervertebral fusion prosthesis 90, which is generally constructed using a 3D printing method, as described above, the bone growth efficiency through the intervertebral fusion prosthesis 90 can be increased, but the intervertebral fusion beam Since the surface of the shape member 90 is rough, it is not easy to be inserted between the vertebral bones.

In addition, the intervertebral fusion prosthesis 90 having a plurality of voids may cause problems such as cracking or bending of a porous portion that cannot overcome an external force in the process of being inserted between the vertebral bones because it is difficult to develop strength.

In addition, in the process of inserting the bone graft inside the intervertebral fusion prosthesis 90, the process of inserting the bone graft into the hole 91 as the periphery of the hole 91 made of a porous material has a rough surface. In the hole 91 may be damaged, such as bending or cracking of the periphery of the porous portion, the surgeon's hand or surgical instruments may be caught and scratched by the porous portion may be caused.

As a solution to this problem, it may be considered to configure a solid portion on the intervertebral fusion prosthesis material 90 having a porous structure. When the number of solid parts increases, the strength of the intervertebral fusion prosthesis material 90 is increased. There may be an advantage in that it is high and the porous part can be protected, but as the proportion of the porous part decreases, it may be difficult to achieve the original purpose of promoting bone growth of the patient originally intended.

Therefore, in the related industry, when constructing an intervertebral fusion prosthesis having a porous structure that is advantageous for promoting bone growth of a patient, the composition of the solid part to protect the porous part is minimized, so that the intervertebral fusion prosthesis is composed of only the porous part. At the same time, the development of a new technology that prevents the fundamental effect of promoting the bone growth of the patient from being impaired is required while solving the problems that may occur.

US published patent publication US2017/0216036A1 (2017.08.03)

The present invention was conceived to solve the above problems,

An object of the present invention is that when a cage made of a porous structure is implanted in a space between adjacent vertebral bones, damage such as cracking or bending of the porous portion may occur at the site where the stress concentration occurs. A solid part with relatively high rigidity is formed on the porous part to prevent damage to the porous part, and this solid part is limited to only the porous part that is likely to be damaged due to stress concentration, thereby preventing damage to the cage while preventing the solid part. It is to provide a porous intervertebral fusion prosthesis that minimizes the formation of the cage so as not to decrease the bone growth efficiency of the cage.

Another object of the present invention is to provide a porous intervertebral fusion prosthesis that promotes fusion between an implant and a bone by increasing the ratio of the porous part by removing unnecessary solid parts.

Another object of the present invention is that the connection frame portion connected to the coupling portion is directly connected only to the shear cover frame portion formed at the front end portion of the head portion, and when the surgical instrument impacts the coupling portion and applies a force to the coupling portion, the force It is to provide a porous intervertebral intervertebral fusion prosthesis that facilitates insertion of an implant even if the configuration of a solid portion is minimized by being transmitted to the shear cover frame portion along the connection frame portion to propel the front end portion of the head portion.

Another object of the present invention is to configure a shear cover frame that surrounds the front end of the head, so that the porosity prevents damage such as cracking and bending of the front end of the head that first approaches the vertebral bone and squeezes between the upper and lower vertebral bones. It is to provide an intervertebral fusion prosthesis.

Another object of the present invention is to construct a rear cover frame that surrounds a certain area of the rear end of the head, so that the cross section has the widest cross section in the head of the shape that becomes smaller toward the front, so that the implant is damaged during the propulsion process. It is a concern to provide a porous intervertebral fusion prosthesis that protects a specific region of the rear end.

Another object of the present invention is a ring frame portion formed along the inner circumferential surface of the through hole, a first link frame portion connecting the ring frame portion and the shear cover frame portion, and a second link frame connecting the ring frame portion and the coupling portion By configuring a connection frame portion including a portion, so that the force applied to the coupling portion is transmitted to the second link frame portion, and sequentially transmitted to the front end cover frame portion of the head portion through the first link frame portion through the ring frame portion. It is to provide a porous intervertebral fusion prosthesis.

Another object of the present invention is to configure a plurality of connecting frame units that are separately formed on one side and the other side of the bone growth unit to form a pair, and one end of them is connected to the shear cover frame unit and the other end is connected to the coupling unit. By doing so, it is to provide a porous intervertebral fusion prosthesis that allows the force applied to the coupling portion to be transmitted to the front side along each connection frame portion formed on both sides of the bone growth portion to propel the shear cover frame portion.

Another object of the present invention is to construct a fixed frame part of a solid structure at the boundary of the fixed part of a porous structure because the fixing part protruding on the body part and generating the fixing force receives a large resistance during the implantation process of the implant. By allowing the fixing part to be supported by the frame part, it is to provide a porous intervertebral fusion prosthesis that prevents damage to the protruding fixing part.

Another object of the present invention is to connect the fixed frame part with the rear cover frame part, so that a large friction is applied during the propulsion process of the implant, and even after the positioning is completed, a load is directly received between the adjacent vertebral bones, the upper surface of the implant It is to provide a porous intervertebral fusion prosthesis so that the upper and lower surfaces can be protected respectively.

Another object of the present invention is to configure the fixing unit with a plurality of threads, wherein the threads include an inclined surface that is inclined and raised in a direction conforming to the insertion direction of the implant, so that the implant can be easily inserted along the propulsion direction. Meanwhile, in the opposite direction, a porous intervertebral fusion prosthesis is provided that limits the movement of the implant by generating a large resistance force.

Another object of the present invention is to provide a porous intervertebral fusion prosthesis that minimizes damage such as bone during implant insertion by configuring a flat surface on a screw thread.

Another object of the present invention is that the fixed frame portion is not coupled and the exposed portion exposed to the outside is configured to protrude outward from the fixed frame portion surrounding the exposed portion, so that the implant is inserted into the space between the vertebral bones of the patient. It is to provide a porous intervertebral fusion prosthesis capable of further promoting the patient's spontaneous bone growth by allowing the exposed portion to be close to the bone side.

Another object of the present invention is that the apex of the exposed portion is configured to be located closer to the central axis of the implant than the apex of the rear cover frame portion and the apex of the fixing frame portion formed on the preceding thread, based on the central axis of the implant. It is to provide a porous intervertebral fusion prosthesis that protects the porous part by allowing the part that rubs against the bone in the process to become the frame part.

Another object of the present invention is that the apex of the exposed part is located closer to the central axis of the implant than the apex of the fixed frame part surrounding the exposed part based on the central axis of the implant, so that the porous intervertebral fusion prosthesis is planned in advance. When positioned at a point, it is to provide a porous intervertebral fusion prosthesis that prevents the load transmitted from the vertebral bone from being concentrated on the exposed portion.

Another object of the present invention is to configure a bone insertion hole penetrating from the upper surface to the lower surface of the body, so that the surgeon can easily insert the bone graft into the porous intervertebral fusion prosthesis. Is to provide.

Another object of the present invention is to allow the bone insertion hole to communicate with the through hole, so that the bone graft that has entered the inside of the porous intervertebral fusion prosthesis through the bone insertion hole can be naturally filled with the space made by the through hole. It is to provide a simplified fusion prosthesis.

Another object of the present invention is to configure a rim frame portion formed in a cylindrical shape along the inner circumferential surface of the bone insertion hole, and the porous portion of relatively weak strength is broken during the insertion of the bone graft through the bone insertion hole to generate porous particles or bend. It is to provide a porous intervertebral fusion prosthesis that prevents damage to the back.

Another object of the present invention is to configure a bone formation hole penetrating the other surface from one side of the rim frame part, so that when the rough porous surface of the porous bone growth part is wrapped with a smooth non-porous surface, it may be easier to insert a bone graft, It is to provide a porous intervertebral fusion prosthesis that solves the problem of lowering bone growth efficiency as much as a portion formed with a surface by promoting bone growth through an empty space made by the bone generation hole.

Another object of the present invention is to have one end of the rim frame connected to the fixed frame, and the other end to be located outside the through-hole area, so that the view is not obstructed when observing bone growth, and through the bone insertion hole. It is to provide a porous intervertebral fusion prosthesis material that allows the inserted bone graft to be naturally filled with the empty space made by the through hole when the bone graft is inserted.

Another object of the present invention is to prevent damage to the corresponding part by combining the corner frame at the boundary between the upper and rear surfaces of the body and the boundary between the lower surface and the rear of the body, which are relatively weak in strength and are easily damaged in position. It is to provide a porous intervertebral fusion prosthesis.

Another object of the present invention is to cover a predetermined area of the front end portion of the head portion with a solid structure by the shear cover frame portion, it will be excellent in preventing damage to the head portion, but bone growth is hindered by the area of the corresponding area. To solve the problem of deteriorating bone fusion at the point where the head is located in the porous intervertebral fusion prosthesis positioned in the space between the vertebral bones, bone fusion on the front side of the head part by configuring the central hole on the shear cover frame part It is to provide a porous intervertebral fusion prosthesis that promotes and solves the problem.

Another object of the present invention is to form a separate upper rear cover frame portion covering a predetermined area of the rear end portion of the upper surface of the head portion and a lower rear end cover frame portion covering a predetermined area of the rear end portion of the lower surface of the head portion, so that the minimum portion required to be protected It is to provide a porous intervertebral fusion prosthesis that does not degrade bone growth efficiency while protecting the porous part by forming a solid part only.

Another object of the present invention is formed along the boundary of the head portion, through a boundary frame portion connecting the upper rear end cover frame portion and the lower rear end cover frame portion formed separately from the front cover frame portion, the head portion of the space between the vertebral bones It is to provide a porous intervertebral fusion prosthesis that allows the force to be pinched to be expressed larger.

The present invention is implemented by an embodiment having the following configuration in order to achieve the above object.

According to an embodiment of the present invention, the present invention provides a bone growth part of a porous structure, a frame part of a solid structure coupled to the bone growth part to protect the bone growth part, and the bone growth part for surgery. Including a coupling portion of a solid structure that is fastened to the mechanism, the bone growth portion includes a head portion having a shape in which an area of a cross section decreases toward an anterior side, and a body portion extending in a rearward direction from a rear end portion of the head portion, the The body portion includes a fixing portion that is inclined and protruded in a direction conforming to the insertion direction of the implant, and the frame portion includes a head frame portion formed to protect the head portion, a fixing frame portion formed to protect the fixing portion, and the fixing It characterized in that it comprises a connection frame portion directly connected to the coupling portion of one side and the other side of the head frame without being directly connected to the frame portion.

According to another embodiment of the present invention, the head frame portion includes a front end cover frame portion formed at a front end portion of the head portion, and a rear end cover formed separately from the front cover frame portion and formed at the rear end portion of the head portion. It includes a frame portion, and the connection frame portion is directly connected to the front cover frame portion, and is not directly connected to the rear cover frame portion.

According to another embodiment of the present invention, the body portion includes a through hole penetrating from one side of the body portion to the other side, and the connection frame portion includes a ring frame portion formed along the inner circumferential surface of the through hole and And a first link frame part connecting the ring frame part and the front end cover frame part, and a second link frame part connecting the ring frame part and the coupling part.

According to another embodiment of the present invention, the connection frame portion is formed separately on one side and the other side of the bone growth portion to form a pair, and a first connection formed along one side of the bone growth portion It is divided into a frame part and a second connection frame part formed along the other side of the bone growth part, and the first connection frame part and the second connection frame part are connected only by the shear cover frame part and the coupling part. do.

According to another embodiment of the present invention, the fixing frame portion is formed along a boundary of the fixing portion and is connected to the rear end cover frame portion.

According to another embodiment of the present invention, the fixing portion includes a plurality of threads formed side by side on the body portion, and the threads include an inclined surface that is inclined upward in a direction conforming to the insertion direction of the implant, And a flat surface extending from an end portion of the inclined surface in a rearward direction, and a protruding surface extending from an end portion of the flat surface to the body portion.

According to another embodiment of the present invention, the inclined surface is characterized in that the fixed frame portion is not coupled and the exposed portion exposed to the outside protrudes outward from the fixed frame portion surrounding the exposed portion. do.

According to another embodiment of the present invention, the apex of the exposed part is closer to the central axis of the implant than the apex of the fixed frame part formed on the apex of the rear cover frame part and the preceding thread with respect to the central axis of the implant. It is characterized in that it is located.

According to another embodiment of the present invention, the apex of the exposed portion is located closer to the central axis of the implant than the vertex of the fixed frame portion surrounding the exposed portion with respect to the central axis of the implant. It is done.

According to another embodiment of the present invention, the fixing part includes an upper fixing part formed on an upper surface of the body part, and a lower fixing part formed on a lower surface of the body part, and the fixing frame part comprises: It characterized in that it comprises an upper fixing frame portion formed to protect the upper fixing portion, and a lower fixing frame portion formed to protect the lower fixing portion.

According to another embodiment of the present invention, the body portion includes a bone insertion hole penetrating from an upper surface to a lower surface of the body portion, and the bone insertion hole communicates with the through hole.

According to another embodiment of the present invention, the frame portion is characterized in that it comprises a rim frame portion formed in a cylindrical shape along the inner circumferential surface of the bone insertion hole.

According to another embodiment of the present invention, in the present invention, the rim frame part has one end connected to the fixed frame part, the other end forming a free end, and covering a certain area of the inner circumferential surface of the bone insertion hole, It is characterized in that the inner circumferential surface of the bone insertion hole is protected during the process of inserting the bone graft through the insertion hole.

According to another embodiment of the present invention, the rim frame portion is characterized in that it includes a bone generation hole penetrating from one surface of the rim frame portion to the other surface.

According to another embodiment of the present invention, the other end of the rim frame portion is located outside the through-hole area.

According to another embodiment of the present invention, the rim frame portion includes an upper rim frame portion connected to an upper fixing frame portion for protecting an upper fixing portion formed on an upper surface of the body portion, and on a lower surface of the body portion. And a lower rim frame part connected to a lower fixing frame part protecting the formed lower fixing part, and the upper rim frame part and the lower rim frame part are formed separately around the through hole.

According to another embodiment of the present invention, the frame portion is characterized in that it further comprises a corner frame portion formed to protect the rear end portion of the body portion.

According to another embodiment of the present invention, the corner frame portion includes an upper corner frame portion surrounding the boundary between the upper surface and the rear surface of the body portion, and a lower corner frame portion surrounding the boundary between the lower surface and the rear surface of the body portion. Characterized in that.

According to another embodiment of the present invention, the shear cover frame portion is characterized in that it includes a central hole formed through the center portion of the shear cover frame portion so as to expose the tip of the head portion to the outside.

According to another embodiment of the present invention, the rear end cover frame part includes an upper rear end cover frame part covering a certain area of a rear end of the upper surface of the head, and a lower side covering a certain area of a rear end of the lower surface of the head. Including a rear end cover frame portion, the upper rear end cover frame portion and the lower rear end cover frame portion is characterized in that it is formed separately.

According to another embodiment of the present invention, the head frame portion is a boundary frame formed along the boundary of the head portion to connect the front cover frame portion to the upper rear cover frame portion and the lower rear cover frame portion. It is characterized in that it further includes wealth.

The present invention can obtain the following effects by the configuration, combination, and use relationship to be described below with the present embodiment.

In the present invention, when a cage made of a porous structure is implanted in a space between adjacent vertebral bones, damage such as cracking or bending of a porous portion may occur at a portion where stress concentration occurs, and a porous portion where stress concentration occurs. A solid part with relatively high rigidity is formed on the phase to prevent damage to the porous part, and the solid part is formed to be limited only to the porous part that is likely to be damaged due to stress concentration, thereby preventing damage to the cage and forming a solid part. Minimizes the effect of providing a porous intervertebral fusion prosthesis that does not reduce the bone growth efficiency of the cage.

The present invention has the effect of providing a porous intervertebral fusion prosthesis that promotes fusion between an implant and a bone by removing an unnecessary solid part and increasing the ratio of the porous part.

In the present invention, the connection frame portion connected to the coupling portion is directly connected only to the shear cover frame portion formed at the front end portion of the head portion, and when the surgical instrument impacts the coupling portion and applies a force to the coupling portion, the force is applied to the connection frame The effect of providing a porous intervertebral fusion prosthesis facilitates insertion of an implant even if the solid part is minimized by being transmitted to the shear cover frame part along the part to propel the front part of the head part.

In the present invention, by configuring a shear cover frame that surrounds the front end of the head, the porous intervertebral fusion beam prevents damage such as cracking and bending of the front end of the head that first approaches the vertebral bone and squeezes between the vertebral bones located up and down. It has the effect of providing a brother.

The present invention constitutes a rear cover frame portion surrounding a certain area of the rear end portion of the head portion, and has the widest cross section in the head portion having a shape whose cross-sectional area becomes smaller toward the front side, so that there is a high risk of damage in the propulsion process of the implant, It has an effect of providing a porous intervertebral fusion prosthesis that protects a specific region of the rear end.

The present invention is a connection comprising a ring frame portion formed along the inner circumferential surface of the through hole, a first link frame portion connecting the ring frame portion and the shear cover frame portion, and a second link frame portion connecting the ring frame portion and the coupling portion A porous intervertebral body configured to constitute a frame part, so that the force applied to the coupling part is transmitted to the second link frame part, and sequentially transmitted to the front end cover frame part of the head part through the first link frame part through the ring frame part. It derives the effect of providing a fused prosthesis.

In the present invention, by forming a plurality of connection frame portions separately formed on one side and the other side of the bone growth portion to form a pair side by side, one end of which is connected to the shear cover frame portion and the other end to the coupling portion, coupling There is an effect of providing a porous intervertebral fusion prosthesis that allows the force applied to the portion to be transmitted to the front side along each connecting frame portion formed on both sides of the bone growth portion to propel the shear cover frame portion.

In the present invention, since the fixing part protruding on the body part and generating the fixing force receives a large resistance during the implantation process of the implant, the fixing frame part of a solid structure is formed at the boundary of the fixing part of the porous structure, and the fixing frame part By allowing the fixing part to be supported, it has the effect of providing a porous intervertebral fusion prosthesis that prevents damage to the protruding fixing part.

In the present invention, by connecting the fixed frame part to the rear cover frame part, the upper surface and the lower surface of the implant receive a large friction during the propulsion process of the implant and receive a load directly between neighboring vertebral bones even after the positioning is completed, respectively. It derives the effect of providing a porous intervertebral fusion prosthesis that allows it to be protected.

In the present invention, the fixing part is composed of a plurality of threads, but the threads include an inclined surface that is inclined and raised in a direction conforming to the direction of insertion of the implant, so that the implant can be easily inserted along the propulsion direction, and the opposite In the direction, there is an effect of providing a porous intervertebral fusion prosthesis that limits the movement of the implant by generating a large resistance force.

The present invention has the effect of providing a porous intervertebral fusion prosthesis that minimizes damage such as bones during implant insertion by configuring a flat surface on a screw thread.

In the present invention, the fixed frame portion is not coupled and the exposed portion is configured to protrude outward from the fixed frame portion surrounding the exposed portion, so that the exposure when the implant is inserted into the space between the vertebral bones of the patient. By allowing the additional bone side to be approached, the effect of providing a porous intervertebral fusion prosthesis capable of further promoting the patient's spontaneous bone growth is derived.

In the present invention, the apex of the exposed portion is configured to be located closer to the central axis of the implant than the apex of the rear cover frame portion and the apex of the fixing frame portion formed on the preceding thread, based on the central axis of the implant. By allowing the part to be rubbed to become the frame part, there is an effect of providing a porous intervertebral fusion prosthesis that protects the porous part.

In the present invention, the apex of the exposed portion is positioned closer to the central axis of the implant than the apex of the fixed frame portion surrounding the exposed portion based on the central axis of the implant, so that the porous intervertebral fusion prosthesis is positioned at a predetermined point. When set, it has the effect of providing a porous intervertebral fusion prosthesis so that the load transmitted from the vertebral bone is not concentrated on the exposed portion.

The present invention has the effect of providing a porous intervertebral fusion prosthesis that allows a surgeon to easily insert a bone graft into the inside of the porous intervertebral fusion prosthesis by configuring a bone insertion hole penetrating from the upper surface to the lower surface of the body part. To derive.

In the present invention, the bone insertion hole is in communication with the through hole, so that the bone graft entering the porous intervertebral fusion prosthesis through the bone insertion hole can be naturally filled with the space created by the through hole. Has the effect of providing.

The present invention constitutes a rim frame portion formed in a cylindrical shape along the inner circumferential surface of the bone insertion hole, and during the insertion process of a bone graft through the bone insertion hole, the relatively weak porous portion is broken to generate porous particles or damage such as bending. It has the effect of providing a prosthesis preventing porous intervertebral fusion.

In the present invention, it is possible to easily insert a bone graft when the rim frame portion is formed with a bone formation hole penetrating through the other surface, and the rough porous surface of the porous bone growth portion is wrapped with a smooth non-porous surface. It derives the effect of providing a porous intervertebral fusion prosthesis that solves the problem of lowering bone growth efficiency as much as the part, by promoting bone growth through the empty space created by the bone generation hole.

In the present invention, one end of the rim frame portion is connected to the fixed frame portion, and the other end is positioned outside the through-hole area, so that the field of view is not obstructed when observing bone growth, while inserting the bone graft through the bone insertion hole. When doing so, there is an effect of providing a porous intervertebral fusion prosthesis that allows the inserted bone graft to be naturally filled with the empty space made by the through hole.

The present invention is a porous intervertebral body that prevents damage to the part by combining the corner frame part to the boundary between the upper surface and the rear surface of the body part, and the boundary between the lower surface and the rear surface of the body part, which is relatively weak in strength and is easily damaged in position. It has the effect of providing a fused prosthesis material.

In the present invention, if the predetermined area of the front end of the head is covered with a solid structure by the shear cover frame, it will be excellent in preventing damage to the head, but bone growth is prevented by the area of the corresponding area, so that between the vertebral bones In the porous intervertebral fusion prosthesis positioned in space, the problem of deteriorating bone fusion at the point where the head is located is solved by promoting bone fusion on the front side of the head by configuring the central hole on the shear cover frame. It derives the effect of providing a porous intervertebral fusion prosthesis.

In the present invention, the upper rear end cover frame portion covering a predetermined area of the rear end portion of the upper surface of the head portion and the lower rear end cover frame portion covering a predetermined area of the rear end portion of the lower portion of the head portion are separately formed to form a solid portion only at the minimum portion requiring protection. It has the effect of providing a porous intervertebral fusion prosthesis that does not degrade bone growth efficiency while protecting the porous part by forming.

The present invention is formed along the boundary of the head portion, through the boundary frame portion connecting the upper rear end cover frame portion and the lower rear end cover frame portion formed separately from the front cover frame portion, the force that the head portion squeezes the space between the vertebral bones It has the effect of providing a porous intervertebral fusion prosthesis that allows it to be expressed larger.

1 is a view of a conventional intervertebral fusion prosthesis.
2 is a front perspective view of a porous intervertebral fusion prosthesis with a minimized solid portion according to an embodiment of the present invention.
Figure 3 is a rear perspective view of Figure 2;
Figure 4 is an anterior perspective view of the bone growth portion. (Void + strut display)
Figure 5 is a side view of the bone growth portion of Figure 4. (Inclination angle theta display)
6 is a view showing the position of the apex of the exposed portion. (Central axis X mark)
Figure 7 is a plan view of the bone growth unit of Figure 4;
8 is a front perspective view of the frame portion.
Fig. 9 is a front view of the frame portion of Fig. 8;
Fig. 10 is a side view of the frame part of Fig. 8. (center axis X mark)
Figure 11 is a rear view of the frame portion of Figure 8;
12 is a front perspective view of a porous intervertebral fusion prosthesis with a minimized solid portion according to another embodiment of the present invention.
Fig. 13 is a front view of the frame portion of Fig. 12;
14 is a side view of the frame portion of FIG. 12;

Hereinafter, preferred embodiments of the porous intervertebral fusion prosthesis with a minimized solid portion according to the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, when it is determined that a detailed description of a known function or configuration may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted. Unless otherwise defined, all terms in this specification are the same as the general meaning of the terms understood by those of ordinary skill in the art to which the present invention belongs. According to the definitions used in the specification.

FIG. 2 is a perspective view of a porous intervertebral fusion prosthesis in which a solid portion is minimized according to an embodiment of the present invention, and FIG. 3 is a rear perspective view of FIG. 2, and will be described below with reference to FIGS. 2 and 3.

The present inventors' porous intervertebral fusion prosthesis 1 with a minimized solid portion refers to a spinal cage that promotes fusion between an implant and a bone by increasing the ratio of the porous portion by removing unnecessary solid portions. In the case of the porous part, a large number of voids are formed to promote bone growth, but there is a problem that the rigidity is weakened by these voids, so a cage made of a porous structure can be implanted in the space between neighboring vertebral bones. In this case, damage such as cracking or bending of the porous part may occur in the area where stress concentration occurs. On the contrary, in the case of a solid part, it is composed of non-porous and has relatively strong stiffness compared to the porous part, so if it is bonded to a porous part that is easily damaged, the porous part can be protected, but in the part where the solid part is formed, There is a problem that bone growth cannot be promoted.

Accordingly, the present invention constitutes only the minimum solid part necessary for protection of the porous part, and the remaining area becomes a porous part. The cage is damaged by forming a solid part with relatively high rigidity on the porous part where stress concentration occurs to prevent damage to the porous part, and by limiting the formation of this solid part to only the porous part that is likely to be damaged due to stress concentration. While preventing the formation of the solid portion is minimized so that the bone growth efficiency of the cage does not decrease. The porous intervertebral fusion prosthesis (1) includes a bone growth part (10), a frame part (30), and a coupling part (50).

4 is an anterior perspective view of the bone growth unit, and reference will be made to FIG.

The bone growth unit 10 is formed in a porous structure, and may have a shape similar to a shape of a space between adjacent vertebral bones into which the porous intervertebral fusion prosthesis 1 is inserted. Preferably, the porous intervertebral fusion prosthesis 1 is fixed by being inserted into the space between the vertebral bones from which the disk has been removed, and thus the vertebral bone in a fixed position so that it can be closely fixed between the vertebral bones without being separated It may have a shape that is complementary to the shape of the inner space therebetween. The bone growth portion 10 may be composed of a void 101 and a strut 103, the void 101 is a concept collectively referred to as empty spaces among the bone growth portion 10, such The void 101 may be configured to be disorderly formed on an arbitrary position of the bone growth unit 10, or may be configured in an orderly manner with a certain shape. The strut 103 refers to a configuration that forms the void 101 and forms the overall appearance of the bone growth portion 10, and the void 101 can be seen to be formed through the strut 103.

FIG. 5 is a side view of the bone growth part of FIG. 4, and referring to FIG. 5, the bone growth part 10 includes a head part 11 and a body part 13.

As shown in FIG. 5, the head portion 11 refers to a portion of the bone growth portion 10 having a shape in which the cross-sectional area becomes smaller toward the front side. The surgery to insert the porous intervertebral fusion prosthesis (1) is performed in the direction of minimizing damage to surrounding tissues such as the patient's skin and bones. Inserting the porous intervertebral fusion prosthesis (1) into the intervertebral intervertebral body is a very difficult task. In particular, when the outside of the porous intervertebral fusion prosthesis (1) is made of the bone growth part (10), the rough end by the strut (103) is exposed to the outside. It makes it difficult to insert the intervertebral fusion prosthesis (1). Therefore, it is possible to more easily insert the porous intervertebral fusion prosthesis 1 by configuring the head part 11 at one end of the bone growth part 10 first inserted between the vertebral bones.

The body part 13, as shown in FIG. 5, has a configuration extending in the rearward direction from the rear end of the head part 11, and when the positioning of the porous intervertebral fusion prosthesis 1 is completed. , It can be viewed as a part that directly contacts the adjacent vertebral bones. Accordingly, it may be desirable that the shape of the body part 13 be configured to have a shape complementary to a space between vertebral bones having different shapes, sizes, etc. for each patient. The body part 13 includes a fixing part 131, a through hole 133, and a bone insertion hole 135.

The fixing part 131 refers to a configuration inclined and protruding from the body part 13 in a direction conforming to the insertion direction of the implant. When the anterior direction shown in FIG. 5 is the insertion direction of the implant, the fixing part 131 may be inclined as shown in the posterior direction so as not to interfere with the propulsion of the porous intervertebral fusion prosthesis 1. The fixing part 131 may be formed on both the upper surface and the lower surface of the body part 13 to secure the fixing force of the porous intervertebral fusion prosthesis 1, and at this time, it is formed on the upper surface of the body part 13 Both the upper fixing part 131a and the lower fixing part 131b formed on the lower surface of the body part 13 are inclined in a direction conforming to the insertion direction of the implant to facilitate the propulsion of the implant, but in a direction opposite to the propelled direction. It limits the movement of the porous intervertebral fusion prosthesis (1) to move.

The fixing part 131 may be a set of a plurality of threads 1311 formed side by side on the body part 13, and these threads 1311 are inclined surfaces 13111, flat surfaces 13113, and protruding surfaces (13115) is included.

The inclined surface 13111 refers to a portion of the thread 1311 that is inclined and raised in a direction conforming to the insertion direction of the implant. When the inclination angle θ of the inclined surface 13111 is large, the bone fixing force of the porous intervertebral fusion prosthesis 1 may be increased, but during the propulsion process, the inclined surface 13111 receives a lot of resistance, and the inclined surface If the inclination angle (θ) of (13111) is small, it may be easier to propel the porous intervertebral fusion prosthesis (1), but after positioning the bone fixing force by the fixing part 131 may not be strong, It is preferable that the inclination angle θ of the inclined surface 13111 is determined in consideration of these comprehensively.

The inclined surface 13111 has an exposed portion 13111a exposed to the outside because the fixed frame portion 33, which will be described later, is not coupled, and the exposed portion 13111a is fixed surrounding the exposed portion 13111a. It is configured to protrude outward from the frame part 33, so that the exposed part 13111a can be closer to the bone side when the porous intervertebral fusion prosthesis 1 is inserted into the space between the vertebral bones of the patient. By doing this, it is possible to further promote the patient's spontaneous bone growth.

However, if the extent of protrusion of the exposed portion 13111a is not limited, the portion that rubs against the bone in the process of propelling the implant will become the exposed portion 13111a that protrudes excessively, not the frame portion 33. In this case, since the exposed portion 13111a may be damaged by an external force such as being broken or bent, it is necessary to limit the degree of protrusion of the exposed portion 13111a. 6 is a view showing the position of the apex of the exposed part. Referring to FIG. 6, in order to prevent the above-described problem from occurring, the apex P1 of the exposed part 13111a is based on the central axis X of the implant. As such, it is preferable to be configured to be located closer to the central axis (X) of the implant than the vertex (P2) of the rear cover frame portion (313) and the vertex (P3) of the fixing frame portion (33) formed on the preceding thread (1311). .

In addition, the apex P1 of the exposed portion 13111a is, based on the central axis X of the implant, than the apex P4 of the fixed frame portion 33 surrounding the exposed portion 13111a. It may be desirable to configure it to be located close to the central axis (X). When the porous intervertebral fusion prosthesis 1 is positioned at a predetermined point, the porous intervertebral fusion prosthesis 1 receives a load transmitted from the vertebral bone. When the vertex P1 is higher than the vertex P4 of the fixed frame portion 33 surrounding the exposed portion 13111a, the exposed portion 13111a is formed of a porous structure by concentrating a load on the exposed portion 13111a. This is because it can be easily damaged by external force.

The flat surface 13113 refers to a portion of the thread 1311 extending from the end of the inclined surface 13111 in the rearward direction. The term extending in the rearward direction means forming approximately horizontally, and is a concept in a broad sense including not only a complete horizontal plane but also a plane close to approximately horizontal as shown in FIG. 5. As the approximately horizontal flat surface 13113 is formed at the point where the inclined surface 131111 ends, if a sharp thread is formed, a problem in which bones, etc. may be greatly damaged during the implant insertion process can be prevented in advance. do.

The protruding surface 13115 refers to a portion of the thread 1311 extending from the end of the flat surface 13113 to the body 13. The protruding surface 13115 may be formed substantially vertically from the end of the flat surface 13113, as shown in FIG. 5, but the present invention is not necessarily limited thereto, and the protruding surface 13115 is It can also be configured to be inclined in the front or rear direction.

The fixing part 131 may be divided into an upper fixing part 131a formed on the upper surface of the body part 13 and a lower fixing part 131b formed on the lower surface of the body part 13. have. The vertebral bones are stacked up along the longitudinal axis of the body, and the porous intervertebral fusion prosthesis (1) is an implant that squeezes the space between adjacent upper and lower vertebral bones. Because you need a means.

The through hole 133 refers to a configuration that penetrates from one side of the body 13 to the other side. 5, the through hole 133 is a hole penetrating the left and right sides of the body 13, and the porous intervertebral fusion prosthesis ( 1) Provides a space in which the inserted bone graft can be seated, and allows the surgeon to check bone growth in the porous intervertebral fusion prosthesis 1 through the through hole 133. The shape of the through hole 133 may be configured such that the side shape has an elliptical shape having a longitudinal direction of the porous intervertebral fusion prosthesis 1 as a long axis, as shown in FIG. 5, but the present invention It is not limited thereto, and may be configured in any number of different forms.

The bone insertion hole 135 is configured to penetrate from the upper surface to the lower surface of the body part 13, and through the bone insertion hole 135, the surgeon has a bone inside the porous intervertebral fusion prosthesis 1 A bone graft can be inserted. 7 is a plan view of the bone growth unit of FIG. 4, and referring to FIG. 7, the bone insertion hole 135 is vertically extended while maintaining the planar shape of the opening as shown in FIG. 7. It may be possible, and although not shown, it includes all the concepts that can be deformed, such as being able to maintain the planar shape of the opening to a predetermined depth and then expand the size thereof. In addition, in FIG. 7, the shape of the bone insertion hole 135 is shown in an elliptical shape in which the longitudinal direction of the porous intervertebral fusion prosthesis 1 is the long axis, but the present invention is not limited thereto, and a bone graft is inserted. If you can put it, it can be changed in any number of ways. However, so that the bone graft that has entered the porous intervertebral fusion prosthesis 1 through the bone insertion hole 135 can be naturally filled into the space made by the through hole 133, the bone insertion hole 135 is It is preferable to communicate with the through hole 133.

8 is a front perspective view of the frame unit, and reference will be made to FIG. 8 below.

The frame part 30 is coupled to the bone growth part 10 to protect the bone growth part 10 and has a solid structure that is a concept opposite to the porous structure. Since the bone growth part 10 has a plurality of voids 101, the strength is relatively weak, so it can be easily broken or bent during the insertion process of the implant, and even if the positioning is completed, until complete bone fusion occurs. It is necessary to withstand the load transmitted from the vertebral bone, but it may be damaged before bone union occurs due to low stiffness. By coupling the frame part 30 to the bone growth part 10, the mechanical Security robbery. In addition, when the frame unit 30 is configured as non-porous in which radiation is opaque, the bone growth unit 10 made of a porous material transmits the radiation as it is through the pore 101 when irradiated with radiation, so that the bone growth unit ( 10), and because the part that is dark due to the opacity of radiation can be distinguished by the frame part 30 and recognized, the easy location of the porous intervertebral fusion prosthesis 1 that is implanted into the patient's body Enables confirmation.

If the porous intervertebral fusion prosthesis 1 is constructed only with the bone growth part 10, the porous intervertebral fusion prosthesis 1 has a void 101 as a whole, and the porous intervertebral fusion prosthesis ( 1) Its stiffness may decrease. Due to this, in the process of inserting the implant, a part of the bone growth part 10 that collides with the bone may be easily damaged, such as being broken or bent, and after the positioning of the implant is completed, it may not withstand the load transmitted from the spine and may be damaged. have. Accordingly, the frame part 30 is coupled to the bone growth part 10 described above to compensate for the strength problem of the bone growth part 10.

Young's modulus (elastic modulus) refers to a proportional constant at this time, as stress and deformation are directly proportional (Hook's law) within the elastic limit. Therefore, a large modulus of elasticity means that the deformation is small, and a small deformation means that the strength of the material is strong. Conversely, a small modulus of elasticity means that there is a lot of deformation, and a lot of deformation means that the strength of the material is weak. When a porous intervertebral fusion prosthesis (1), which has a larger elastic modulus than that of the patient's bone, is inserted between the vertebral bones, a stress shield that reduces the patient's bone density by the porous intervertebral fusion prosthesis (1). Since stress shielding and sinking down of the bone may occur, the elastic modulus of the porous intervertebral fusion prosthesis 1 is preferably configured to be close to the elastic modulus of the patient's bone. , This can be adjusted by changing the configuration of the frame unit 30 coupled to the bone growth unit 10.

However, when the composition ratio of the frame part 30 is increased to supplement the strength of the bone growth part 10 and adjust the elastic modulus, etc., in the region in which the frame part 30 is configured due to a non-porous structure, the bone spontaneously Growth becomes difficult, and eventually the effect of promoting bone growth through the porous intervertebral fusion prosthesis 1 may not occur.

Therefore, the frame part 30 protects the bone growth part 10 and makes the elastic modulus of the porous intervertebral fusion prosthesis 1 close to that of the patient's bone, while promoting bone growth. It will be said that only the minimum use within a range that does not harm is required, and for this purpose, the frame unit 30 is, as shown in FIG. 8, a head frame unit 31, a fixed frame unit 33, and a connection frame unit 35 ), a rim frame part 37, and a corner frame part 39.

The head frame part 31 is formed to protect the head part 11, and when the implant is pushed, the front end part of the head part 11 that precedes the most and the cross section perpendicular to the propulsion direction of the implant Among the parts having a large cross-section, there is a high risk of damage to the upper and lower parts that touch the vertebral bone, and thus refers to a configuration in which only these parts are limited and protected. The head frame part 31 includes a front cover frame part 311 and a rear cover frame part 313.

The shear cover frame portion 311 is formed at the front end of the head portion 11 to protect the front end portion of the head portion 11. The porous intervertebral fusion prosthesis 1 according to the present invention can be propelled in an anterior direction as shown in FIG. 8, wherein the first part proximate to the vertebral bone is the front end of the head part 11, and the head part ( Since the front end of 11) is highly likely to be damaged by external force, the part is covered with a solid frame to protect it. In addition, the coupling portion 50, which will be described later, is preferably formed at the rear end of the porous intervertebral fusion prosthesis 1 to receive a force from the surgical instrument, and the force applied by the surgical instrument is from the coupling portion 50. Since it may be difficult to properly transfer to the farthest head part 11, the shear cover frame part 311 is configured at the front end of the head part 11, so that the propulsion force by the surgical instrument is applied to the head part 11 So that it can be easily transferred to the front end of the machine. FIG. 9 is a front view of the frame portion of FIG. 8. Referring to FIG. 9, the shear cover frame portion 311 may be formed as shown to cover a predetermined area in front of the head portion 11. The shear cover frame part 311 includes a center hole 3111.

The center hole 3111 refers to a hole formed through the center of the shear cover frame part 311 to expose the tip of the head part 11 to the outside. When a predetermined area of the front end portion of the head portion 11 is covered with a solid structure by the shear cover frame portion 311, it will be excellent in preventing damage to the head portion 11, but Bone growth is hindered, and bone fusion is difficult to be properly performed at the point where the head part 11 is located in the porous intervertebral fusion prosthesis 1 positioned in the space between the vertebral bones. Therefore, by configuring the center hole 3111 on the shear cover frame part 311, it is possible to promote bone union of the front side of the head part 11.

The rear end cover frame part 313 is formed separately from the front end cover frame part 311 and is formed to protect the rear end of the head part 11. As described above, the head portion 11 has a shape in which the area of the cross section decreases toward the front side. On the contrary, since the area of the cross section increases toward the rear side, the widest cross section at the rear end of the head portion 11 Will have. Therefore, the portion that receives the greatest resistance in the propelling process of the porous intervertebral intervertebral prosthesis 1 will be the rear end of the head 11, and there is a great risk of damage to the rear end of the head 11 due to this. , The rear end cover frame portion 313 covering a predetermined area of the rear end portion of the head portion 11 is limitedly formed. The rear end cover frame part 313 includes an upper rear cover frame part 313a covering a certain area of the rear end of the upper surface of the head part 11, and a lower side covering a certain area of the rear end of the lower surface of the head part 11 As the rear end cover frame portion 313b, it may be formed separately to form an upper and lower pair.

The fixing frame part 33 is formed to protect the fixing part 131, is formed along a boundary of the fixing part 131, and may be connected to the rear cover frame part 313. The fixing part 131 is formed protruding on the body part 13 and receives a large resistance force as it is a part that generates a fixing force. In order to prevent damage by an external force, the fixing part 131 is formed along the boundary of the fixing part 131. By configuring the fixing frame 33 so that the fixing part 131 can be supported, damage to the protruding fixing part 131 is prevented. FIG. 10 is a side view of the frame part of FIG. 8, and referring to FIG. 10, since the fixing part 131 is formed on the upper and lower surfaces of the body part 13, respectively, the fixing frame The part 33 includes an upper fixing frame part 33a formed to protect the upper fixing part 131a, and a lower fixing frame part 33b formed to protect the lower fixing part 131b, and the upper side It is preferable that the fixed frame portion 33a and the lower fixed frame portion 33b are configured separately as shown in FIG. 10.

The connection frame portion 35 refers to a configuration in which the head frame portion 31 on one side and the coupling portion 50 on the other side are directly connected without being directly connected to the fixed frame portion 33. Preferably, the connection frame part 35 may be configured to be directly connected to the front cover frame part 311 and not directly connected to the rear cover frame part 313, as shown in FIG. 10. . The connection frame portion 35 is directly connected to the coupling portion 50 to be described later to receive the force applied by the surgical instrument fastened to the coupling portion 50, and this force is transferred to the shear cover frame portion 311 By delivering, the porous intervertebral fusion prosthesis 1 is promoted easily. In that the front cover frame part 311 precedes the rear cover frame part 313 when the propulsion direction is referenced, in order to minimize the formation of unnecessary solid parts, the connection frame part 35 is the rear cover It is not directly connected to the frame part 313, but may be directly connected only to the shear cover frame part 311. Preferably, as shown in FIG. 10, the coupling part 50, the connection frame part 35, and the shear cover frame part 311 are disposed approximately horizontally along the central axis X of the implant to provide a surgical instrument. When the impact is applied to the coupling part 50, efficient force transmission can be achieved. The connection frame portion 35 includes a ring frame portion 351, a first link frame portion 353, and a second link frame portion 355.

The ring frame part 351 is formed along the inner circumferential surface of the through hole 133 and is protected by wrapping around the opening of the through hole 133 in a solid structure. Accordingly, the shape of the ring frame part 351 may be configured to have a shape complementary to the shape of the inner circumferential surface of the through hole 133. Although not necessarily limited thereto, since the patient's bone graft can be inserted through the bone insertion hole 135, the thickness of the ring frame portion 351 needs to be configured as large as the rim frame portion 37 to be described later. There is no, and as shown in FIG. 10, it can be configured to be relatively elaborate.

The first link frame portion 353 refers to a configuration connecting the ring frame portion 351 and the shear cover frame portion 311. Through this, the first link frame portion 353 functions to receive the force from the ring frame portion 351 and transmit the force to the shear cover frame portion 311 again. According to the contents shown in FIG. 10, the first link frame portion 353 has a shape of a straight line that is slightly bent along the shape of the outer circumferential surface of the bone growth portion 10, and the first link frame portion 353 The shape of is not necessarily limited to this shape, and it can be configured in any number of ways if it can perform the above-described functions. However, in order to minimize unnecessary solid parts, it is desirable to be formed to be limited only to the extent necessary for smooth force transmission.

The second link frame portion 355 is configured to connect the ring frame portion 351 and the coupling portion 50, and when a force is applied to the coupling portion 50 from the surgical instrument, the second link frame portion ( 355 receives the force from the coupling portion 50 and is transmitted back to the ring frame portion 351 side. Referring to FIG. 10, the second link frame part 355 forms a separate solid part elongated at the top and bottom around a solid part having a shape similar to that of the first link frame part 355 of FIG. 10. However, the shape of the second link frame unit 355 is not limited thereto and may be configured differently. However, it may be desirable to be configured as shown in FIG. 10 in terms of efficient transmission of force and minimizing interference with bone growth.

The connection frame portion 35 is preferably formed separately on one side and the other side of the bone growth portion 10 to form a pair, and in this case, the connection frame portion 35 is And a first connection frame portion 35a formed along one side of the bone growth portion 10 and a second connection frame portion 35b formed along the other side of the bone growth portion 10, and the The first connection frame portion 35a and the second connection frame portion 35b may be connected only by the front cover frame portion 311 and the coupling portion 50.

The rim frame part 37 is formed in a cylindrical shape along the inner circumferential surface of the bone insertion hole 135, and one end is connected to the fixed frame part 33, and the other end forms a free end. A certain area of the inner circumferential surface of the insertion hole 135 is covered, so that the inner circumferential surface of the bone insertion hole 135 is protected in the process of inserting the bone graft through the bone insertion hole 135. Preferably, the other end of the rim frame part 37 is configured to be located outside the area of the through hole 133, that is, not to enter the area of the through hole 133 as shown in FIG. 10, and the through hole 133 ), so that the visual field is not obstructed when observing bone growth through, the bone graft inserted when the bone graft is inserted through the bone insertion hole 135 will be naturally filled with the empty space made by the through hole 133. To be able to. The rim frame part 37 includes a bone generation hole 371.

The bone generation hole 371 refers to a configuration formed so as to penetrate from one surface of the rim frame part 37 to the other surface. When the rim frame part 37 is configured to wrap the rough porous surface of the porous bone growth part 10 with a smooth non-porous surface, it may be easier to insert a bone graft, There may be a problem of poor growth efficiency. To solve this problem, by configuring the bone generation hole 371 on the rim frame part 37, it is possible to promote bone growth through the empty space created by the bone generation hole 371. The bone generation hole 371 may be formed in plural on the rim frame part 37. As shown in FIG. 10, although the bone generation hole 371 is arranged on the rim frame part 37 regularly at regular intervals in a circle, the bone generation hole 371 is limited to this concept. In addition, it may be freely disposed on the rim frame part 37 in various forms and at any position.

As described above, the rim frame part 37 is preferably not interfered with the through hole 133, and the upper fixing part 131a formed on the upper surface of the body part 13 is protected. The upper rim frame part 37a connected to the frame part 33a and the lower rim frame part connected to the lower fixing frame part 33b for protecting the lower fixing part 131b formed on the lower surface of the body part 13 ( 37b), and the upper rim frame part 37a and the lower rim frame part 37b are separately formed around the through hole 133.

The corner frame part 39 is formed to protect the rear end of the body part 13, and as shown in FIG. 5 mentioned above, the end of the porous intervertebral fusion prosthesis 1, especially the corner When the portion is composed of only the bone growth part 10, a plurality of voids 101 are formed to prevent damage such as cracking or bending of the strut 103 of the bone growth part 10 with weak strength due to various causes. I can wear it. In particular, the upper and lower surfaces of the porous intervertebral fusion prosthesis (1) inserted into the space between the upper and lower vertebrae are the parts that rub against the vertebrae during the implantation process, and are the parts that receive loads from the vertebral bones. It has no choice but to be vulnerable. Accordingly, the corner frame portion 39 includes an upper corner frame portion 39a surrounding the boundary between the upper surface and the rear surface of the body portion 13, and a lower corner frame surrounding the boundary between the lower surface and the rear surface of the body portion 13 It is divided into parts 39b to supplement the strength of parts that are likely to be damaged. The corner frame part 39 only needs to be protected by wrapping and protecting the boundary between the upper surface and the rear surface of the body unit 130 and the boundary between the lower surface and the rear surface, and is not a part that receives and transmits the driving force transmitted from the surgical instrument, as shown in FIG. Independently configured as described above may be desirable in terms of minimizing the solid portion.

FIG. 11 is a rear view of the frame part of FIG. 8, and will be described below with reference to FIG. 11.

The coupling part 50 is coupled to the bone growth part 10 to be fastened to a surgical instrument, and may have a solid structure similar to the frame part 30. Preferably, the coupling part 50 is formed at the rear end of the porous intervertebral fusion prosthesis 1, and the surgical instrument is configured to apply an impact to the coupling part 50. The coupling part 50 transmits the force transmitted from the surgical instrument to the connection frame part 35, and the force transmitted to the connection frame part 35 is transmitted to the head frame part 31, as a whole. The implant can be promoted easily. The shape of the coupling part 50 is not limited to a specific concept, and may be variously determined in relation to the surgical instrument to be used to insert the porous intervertebral fusion prosthesis 1 between the vertebral bones of the patient. have. The coupling part 50 is a part of the coupling part 50 in which the surgical instrument is gripped in that it is a part that receives an external force by being combined with a surgical instrument in the process of inserting the porous intervertebral fusion prosthesis 1 between the vertebral bones. As shown in Figure 11, it is preferably configured to be exposed to the outside of the bone growth portion (10).

12 is a front perspective view of a porous intervertebral fusion prosthesis material with a minimized solid part according to another embodiment of the present invention, FIG. 13 is a front view of the frame part of FIG. 12, and FIG. 14 is a frame part of FIG. 12 As a side view, this embodiment is characterized in that a boundary frame portion 315 is added to the head frame portion 31 in the above-described embodiments of FIGS. 2 to 11. In order to avoid redundant description, only the boundary frame unit 315 will be described below.

The boundary frame part 315 is formed along the boundary of the head part 11 to form the front end cover frame part 311 with the upper rear end cover frame part 313a and the lower rear end cover frame part 313b. It refers to the configuration that connects. According to the above, in order to minimize the formation of unnecessary solid parts, in that the front cover frame part 311 precedes the rear cover frame part 313 when the propulsion direction is referenced, the connection frame part ( 35) is not directly connected to the rear cover frame part 313, but may be directly connected only to the front cover frame part 311. However, as shown in Figs. 12 to 14, the boundary frame part 315 is additionally configured so that the head part 11 can express a greater force entering the space between the vertebral bones. By directly connecting the front end cover frame part 311 and the rear end cover frame part 313, when the front end cover frame part 311 is propelled by the force pushed by the connection frame part 35, the front end cover frame part The rear end cover frame part 313 may be pulled by the force 311 is propelled.

The detailed description above is illustrative of the present invention. In addition, the above description shows and describes preferred embodiments of the present invention, and the present invention can be used in various other combinations, modifications, and environments. That is, changes or modifications may be made within the scope of the concept of the invention disclosed in the present specification, the scope equivalent to the disclosed contents, and/or the skill or knowledge of the art. The above-described embodiments describe the best state for implementing the technical idea of the present invention, and various changes required in the specific application fields and uses of the present invention are also possible. Therefore, the detailed description of the invention is not intended to limit the invention to the disclosed embodiment. In addition, the appended claims should be construed as including other embodiments.

1: Porous intervertebral fusion prosthesis with minimal solid part
10: bone growth part
11: head
13: body part
131: fixing part
131a: upper side fixed government
131b: lower fixed government
1311: thread
13111: slope
13111a: exposed part
13113: flat surface
13115: protruding surface
133: through hole
135: bone insertion hole
30: frame part
31: head frame part
311: shear cover frame portion
3111: center hole
313: rear cover frame part
313a: upper rear cover frame part
313b: lower rear end cover frame part
315: border frame portion
33: fixed frame part
33a: upper fixing frame portion
33b: lower fixing frame portion
35: connection frame part
35a: first connection frame part
35b: second connection frame portion
351: ring frame portion
353: first link frame unit
355: second link frame unit
37: rim frame part
37a: upper rim frame portion
37b: lower rim frame portion
371: bone generation hole
39: corner frame portion
39a: upper corner frame portion
39b: lower corner frame portion
50: coupling portion

Claims (21)

A bone growth portion having a porous structure, a frame portion of a solid structure coupled to the bone growth portion to protect the bone growth portion, and a solid structure coupling portion coupled to the bone growth portion and fastened to a surgical instrument,
The bone growth portion includes a head portion having a shape in which an area of a cross section decreases toward an anterior side, and a body portion extending from a rear end portion of the head portion in a rearward direction,
The body portion includes a fixing portion protruding inclined in a direction conforming to the insertion direction of the implant,
The frame portion includes a head frame portion formed to protect the head portion, a fixed frame portion formed to protect the fixed portion, and the coupling portion on one side of the head frame portion and the other side without being directly connected to the fixed frame portion. Including the connecting frame that is directly connected, it promotes the fusion between the implant and the bone by increasing the proportion of the porous part by removing unnecessary solid parts.
The fixing part includes a plurality of threads formed side by side on the body part,
The thread includes an inclined surface that is inclined and raised in a direction conforming to the insertion direction of the implant,
The inclined surface, the exposed portion exposed to the outside because the fixed frame portion is not coupled protrudes outward from the fixed frame portion surrounding the exposed portion,
The apex of the exposed part is a solid part, characterized in that it is located closer to the central axis of the implant than the apex of the rear cover frame part formed on the rear end of the head part and the apex of the fixing frame part formed on the preceding thread based on the central axis of the implant. This minimized porous intervertebral fusion prosthesis. The method of claim 1,
The head frame portion includes a front end cover frame portion formed at a front end portion of the head portion, and a rear end cover frame portion formed separately from the front end cover frame portion and formed at a rear end portion of the head portion,
The connection frame portion, characterized in that directly connected to the front cover frame portion, and not directly connected to the rear cover frame portion, the porous intervertebral fusion prosthesis material with a minimized solid portion. The method of claim 2,
The body portion includes a through hole penetrating from one side of the body portion to the other side,
The connection frame portion, a ring frame portion formed along the inner circumferential surface of the through hole, a first link frame portion connecting the ring frame portion and the shear cover frame portion, and a second link frame connecting the ring frame portion and the coupling portion A porous intervertebral fusion prosthesis, characterized in that it comprises a portion, a solid portion is minimized. The method of claim 3,
The connection frame portion is formed separately on one side and the other side of the bone growth portion to form a pair, and a first connection frame portion formed along one side of the bone growth portion, and a first connection frame portion formed along the other side of the bone growth portion. It is divided into 2 connecting frame parts,
The first connection frame portion and the second connection frame portion, characterized in that connected only by the shear cover frame portion and the coupling portion, the solid portion is minimized porous intervertebral fusion prosthesis. The method of claim 2,
The fixed frame portion is formed along the boundary of the fixed portion, characterized in that connected to the rear end cover frame portion, the solid portion is minimized porous intervertebral fusion prosthesis. The method of claim 5,
The screw thread comprises a flat surface extending from an end of the inclined surface in a rearward direction, and a protruding surface extending from an end of the flat surface to the body part, a porous intervertebral fusion prosthesis with a minimized solid portion . delete delete A bone growth portion having a porous structure, a frame portion of a solid structure coupled to the bone growth portion to protect the bone growth portion, and a solid structure coupling portion coupled to the bone growth portion and fastened to a surgical instrument,
The bone growth portion includes a head portion having a shape in which an area of a cross section decreases toward an anterior side, and a body portion extending from a rear end portion of the head portion in a rearward direction,
The body portion includes a fixing portion protruding inclined in a direction conforming to the insertion direction of the implant,
The frame portion includes a head frame portion formed to protect the head portion, a fixed frame portion formed to protect the fixed portion, and the coupling portion on one side of the head frame portion and the other side without being directly connected to the fixed frame portion. Including the connecting frame that is directly connected, it promotes the fusion between the implant and the bone by increasing the proportion of the porous part by removing unnecessary solid parts.
The fixing part includes a plurality of threads formed side by side on the body part,
The thread includes an inclined surface that is inclined and raised in a direction conforming to the insertion direction of the implant,
The inclined surface, the exposed portion exposed to the outside because the fixed frame portion is not coupled protrudes outward from the fixed frame portion surrounding the exposed portion,
The apex of the exposed part is located closer to the central axis of the implant than the apex of the fixed frame part surrounding the exposed part, based on the central axis of the implant, the porous intervertebral fusion prosthesis material with a minimized solid part . The method of claim 1 or 9,
The fixing part includes an upper fixing part formed on an upper surface of the body part, and a lower fixing part formed on a lower surface of the body part,
The fixing frame portion, characterized in that it comprises an upper fixing frame portion formed to protect the upper fixing portion, and a lower fixing frame portion formed to protect the lower fixing portion, a porous intervertebral fusion prosthesis with a minimized solid portion. The method of claim 3,
The body portion includes a bone insertion hole penetrating from the upper surface to the lower surface of the body portion,
The bone insertion hole, characterized in that in communication with the through hole, the solid portion is minimized porous intervertebral fusion prosthesis. The method of claim 11,
The frame portion, characterized in that it comprises a rim frame portion formed in a cylindrical shape along the inner circumferential surface of the bone insertion hole, the solid portion is minimized porous intervertebral fusion prosthesis. The method of claim 12,
The rim frame part has one end connected to the fixed frame part, the other end forming a free end, covering a certain area of the inner circumferential surface of the bone insertion hole, and the inner circumferential surface of the bone insertion hole in the process of inserting a bone graft through the bone insertion hole Porous intervertebral fusion prosthesis with minimal solid parts to ensure protection. The method of claim 13,
The rim frame portion, characterized in that it comprises a bone generation hole penetrating from one surface of the rim frame portion to the other surface, a porous intervertebral fusion prosthesis with a minimized solid portion. The method of claim 13,
The other end of the rim frame portion, characterized in that located outside the through-hole region, the solid portion is minimized porous intervertebral fusion prosthesis. The method of claim 15,
The rim frame part includes an upper rim frame part connected to an upper fixing frame part for protecting an upper fixing part formed on an upper surface of the body part, and a lower part connected to a lower fixing frame part for protecting a lower fixing part formed on a lower surface of the body part. Including a rim frame portion,
The upper rim frame part and the lower rim frame part, characterized in that the through hole is formed separately as a center, a porous intervertebral fusion prosthesis with a minimized solid part. The method of claim 1,
The frame portion, characterized in that it further comprises a corner frame portion formed to protect the rear end portion of the body portion, the solid portion is minimized porous intervertebral fusion prosthesis. The method of claim 17,
The corner frame portion, characterized in that it includes an upper corner frame portion surrounding the boundary between the upper surface and the rear surface of the body portion, and a lower corner frame portion surrounding the boundary between the lower surface and the rear surface of the body portion, a porous intervertebral body with a minimized solid portion Fusion prosthesis. The method of claim 2,
The shear cover frame portion, characterized in that it comprises a central hole formed through the center portion of the shear cover frame portion so as to expose the tip of the head portion to the outside. The method of claim 2,
The rear end cover frame part includes an upper rear end cover frame part covering a certain area of the rear end of the upper surface of the head part, and a lower rear end cover frame part covering a certain area of the rear end part of the lower surface of the head part,
The upper rear end cover frame portion and the lower rear end cover frame portion are formed separately. The method of claim 20,
The head frame portion is formed along the boundary of the head portion, characterized in that it further comprises a boundary frame portion that connects the front end cover frame portion to the upper rear end cover frame portion and the lower rear end cover frame portion, the solid portion is minimized. Porous intervertebral fusion prosthesis.

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