WO2009088238A2

WO2009088238A2 - Artificial knee joint for preventing ligament injury

Info

Publication number: WO2009088238A2
Application number: PCT/KR2009/000104
Authority: WO
Inventors: Doo-Hoon Sun; Yong-Sik Kim; Jung-Sung Kim; Byung-Soo Kim; Jai-Gon Seo; Woo-Shin Cho; Hyun-Kee Chung; Myung-Chul Lee
Original assignee: Corentec Inc.
Priority date: 2008-01-08
Filing date: 2009-01-08
Publication date: 2009-07-16
Also published as: KR100901528B1; WO2009088238A3; WO2009088238A4

Abstract

This invention relates to an artificial knee joint which can prevent the injury of a ligament and replace a natural knee joint. More particularly, this invention relates to an artificial knee joint which includes: a femur joint member which is joined to an end portion of a tibia near a femur; a tibia joint member which is joined to an end portion of the femur near the tibia; and a bearing member which is placed between the femur and tibia joint members. A chamber is formed at an end portion of a posterior condyle in the femur joint member to prevent the injury of a ligament caused by the flection of the femur joint member in the case of knee exercise. In addition, a CR type operation is used in the insertion of the artificial knee joint in order to preserve the posterior cruciate ligament. At this time, as there is the possibility that the posterior cruciate ligament may be injured due to the flection of the femur joint member, an additional chamber is formed at an inner side of an end portion in the posterior condyle. Furthermore, a chamber is formed at a posterior protrusion in the bearing member to prevent a ligament from colliding against the bearing. Consequently the injury of the ligament can be prevented. For this purpose, the artificial knee joint includes: the femur joint member that is joined to an end portion of a tibia near a femur; the tibia joint member that is joined to an end portion of the femur near the tibia; and the bearing member that is placed between the femur and tibia joint members, the end portion of the posterior condyle at the femur joint member includes an external chamber to prevent the collision of a lateral ligament against the femur joint member. Provided is an artificial knee joint that is able to prevent injury to a ligament.

Description

Artificial knee joint to prevent ligament injury

The present invention relates to an artificial knee joint that can replace the knee joint, and more particularly, the femur coupling member coupled to the tibia side end of the femur, the tibia coupling member coupled to the femur side end of the tibia, and the femur coupling member In the artificial knee joint consisting of a bearing member positioned between the tibial coupling member, in order to prevent ligament damage when there is a movement of the knee, a chamfer is formed at the end of the posterior condyle of the femoral coupling member. It relates to an artificial knee joint that can prevent the femur coupling member from damaging the ligament due to twisting rotation and the like. In addition, the artificial knee joint of the present invention is performed in the CR type when the artificial knee joint maintains the posterior cruciate ligament, in which case there is a risk of damaging the posterior cruciate ligament according to the twisting rotation of the femoral coupling member. It is possible to prevent this by forming a separate chamfer on the inside, and also to prevent the ligament damage by forming a chamfer on the rear protrusion in the bearing member to prevent the ligaments from colliding.

Of the numerous joints that make up the body, the knee joint is the joint site between the tibia and the femur, and an increasing number of patients are in an unrecoverable state due to wear and tear of the knee joint and aging and accidents. The knee joint is a knee joint that is a joint between the lower part of the femur, the upper tibia and the back of the patella (knee bone), which functions to bend the leg backward from the knee.

The back of the patella is covered with cartilage of 4mm to 6mm thickness, which stretches the knee of the quadriceps, moving up and down the joint surface of the distal tip of the thigh (femur) during bending and blooming. Improves strength The pressure on the patella-femoral joint when walking on flat lands is half the weight, and three times the weight when climbing stairs and eight times the weight when squatting and rising. The articular capsule begins at the edge of the lower femur and attaches to the top of the tibia. In addition, the joints are strengthened at the same time as the joints are strengthened by the strong ligaments including the medial and lateral collateral ligaments and the cruciate ligaments in the articular capsule.

When looking at the symptoms of joint meniscus cartilage damage of the knee joint, joint meniscus is cartilage tissue located between the femur and the tibia that make up the knee joint, located between the joint cartilage to cushion the impact of the knee joint and to provide nutrients to the joint cartilage. Supplying, providing stability of the joints, and at the same time smoothing the movement of the knee joint, and serves to transmit weight load.

Usually, the joint meniscus is composed of medial meniscus and lateral meniscus. In Europe and the United States, medial meniscus is more damaged than the outside and is less likely to move, resulting in greater damage to the medial meniscus. There are many known.

Meniscus injuries are one of the most common injuries to the knee joints, and are often caused by sports, mountain climbing or everyday injuries. When the rotational movement is applied in a state where the knee is bent, that is, when the torsional force is generated in the knee joint, it may be accompanied by damage of the cruciate ligament, the collateral ligament, the tibia, and the like when a severe external force is applied.

Most of the symptoms occurring in the patella can be symptomatic without special trauma. The cause of the disease is the structural and functional abnormalities of the patella-femoral joint. If the leg is abnormally outward or the foot is turned outwardly, excessive force is applied to the patella-femoral joint repeatedly, which can lead to softening of the articular cartilage, even if the knee joint is not used for a long time. Can occur due to construction. If there is structural abnormality in the patella-femoral joint, a brace to stabilize the patella may be worn, and if the injury is severe, surgical treatment may be performed to replace the artificial knee joint.

Recently, a procedure for replacing artificial joints with patients who cannot recover due to severe damage to joints has been widely performed, and the mechanical motions of these artificial joints are made of metal, ceramic, or polyethylene, which have excellent mechanical properties and low coefficient of friction. It is improving biocompatibility. In general, the artificial knee joint is divided into a femur portion and a tibia portion, and a bearing portion corresponding to cartilage between the femur portion and the tibia portion. The femur and tibia are mainly metal alloys, and the cartilage is made of polyethylene. The tibial part is fixed by an insertion part inserted into the knee joint end of the tibia. The insert is secured by the bone marrow of the tibia. However, when the load is repeatedly applied to the knee joint, it is difficult to achieve a sufficient effect due to the structural defect of the artificial knee joint, and the femoral portion and the tibial portion are damaged or, in particular, the bearing portion are damaged by the continuous load. To cause a big problem.

In the case of the conventional artificial knee joint, as shown in the conventional artificial knee joint of FIG. 1, first, a part of the tibia side of the femur 1 is cut and the femoral coupling member 10 is coupled and fixed, and then the tibia 3 A portion of the femoral side is cut and the tibial coupling member 30 is fixed to the site. Next, the bearing member 50 is positioned between the contact portion 13 of the femur coupling member 10 and the groove portion 51 positioned on the upper surface of the bearing member 50 so that the bending motion of the knee joint is increased. Make it possible. However, in the case of the conventional artificial knee joint coupled as described above, as shown in the elevation view in FIG. 1, the femoral coupling member 10 is capable of movement only in the front-rear direction during the bending motion on the upper surface of the bearing member 50. no. That is, the knee joint of the actual human body does not only perform the forward and backward movement of the tibia, but slightly twists the rotation. Accordingly, when the artificial knee joint is performed, the bearing member (the bearing member 50 at the contact surface of the femur coupling member 10) 50) Rotation in the plane of the upper surface occurs. Due to this planar twisting rotation, the tip of the posterior condyle of the femoral coupling member 10 collides with the ligaments existing on the side, and may eventually damage the ligaments.

In the conventional artificial knee joint surgery, there are CR type and PS type surgery, where CR type is a type of artificial knee joint when the posterior cruciate ligament is not removed and PS type is a posterior cruciate ligament. Refers to the type of artificial knee joint that replaces the posterior cruciate ligament with the post of the bearing member in the state of removing. Accordingly, when the artificial knee joint is treated, when the femoral coupling member twists and rotates in a plane on the bearing member upper surface by the outer edges of both ends of the posterior joint end of the femoral coupling member, a problem occurs in that it collides with the ligaments of the side. . In addition, although the PS type artificial knee joint replaces the posterior cruciate ligament removed by the cam of the bearing member and the femur coupling member, there is no fear of damage of the posterior cruciate ligament in the center, but the CR In the case of the artificial knee joint of the type, the artificial knee joint is operated while maintaining the posterior cruciate ligament, so that the femoral joint member is twisted on the upper surface of the bearing member by the inner edge of the posterior joint end of the femur joint member. The posterior cruciate ligament may be damaged.

In addition, when looking at the posterior protrusion in the bearing member of the conventional artificial knee joint, even if it is protruded to a low height, the posterior ligament with the posterior protrusion of the bearing member collides because there is a slight forward bending when the knee is fully extended The case occurs. As a result, the posterior ligaments may be damaged, accompanied by pain, and seriously cause disease due to inflammation.

The present invention has been made to solve the problems of the prior art, an object of the present invention, the side ligament collision by the horizontal axis of the femoral coupling member by the outer edge of the femur coupling member in the conventional artificial knee joint Since the ligament is damaged, the artificial knee joint of the present invention includes an outer chamfer at the outer edge of the posterior joint end of the femoral coupling member, thereby preventing ligament injury by preventing the collision with the side ligament. To provide an artificial knee joint.

Another object of the present invention, there is a problem that the posterior cruciate ligament existing in the inner side of the artificial knee joint of the conventional CR type collides with the inner edge of the femoral coupling member in accordance with the transverse rotation of the femoral joint member, the ligament is damaged, It is to provide an artificial knee joint to prevent damage to the ligament by preventing the collision with the posterior cruciate ligament by including an inner chamfer in the inner edge of the posterior joint end of the femur coupling member.

Another object of the present invention is that, in the conventional artificial knee joint, when the knee joint is fully extended, there is a case in which the posterior ligament collides with the posterior protrusion of the bearing member and the ligament is damaged. It is to provide an artificial knee joint to prevent the ligament damage by including a rear chamfer to the rear projection of the bearing member to prevent that.

Still another object of the present invention is that in a conventional artificial knee joint, pain caused by collision with the ligaments and seriously inflamed, causing the disease, in order to prevent this, chamfering the femoral coupling member and the bearing member It is to provide a more stable artificial knee joint.

The present invention will be implemented by the embodiment having the following configuration in order to achieve the above object, and includes the following configuration.

According to an embodiment of the present invention, the artificial knee joint according to the present invention is a femur coupling member coupled to the distal end of the femur, a tibia coupling member coupled to the distal end of the tibia, and between the femur coupling member and the tibia coupling member In an artificial knee joint comprising a bearing member positioned therein, the femoral coupling member includes an outer chamfer chamfered at the outer edge of its posterior joint end to prevent collision with the lateral ligaments so as to prevent ligament damage. It features.

According to another embodiment of the present invention, the artificial knee joint according to the present invention, the femoral joint member further comprises an inner chamfer chamfered at the inner edge of the posterior joint end ligament injury by preventing collision with the posterior cruciate ligament It is characterized in that to prevent the.

According to another embodiment of the present invention, the artificial knee joint according to the present invention is characterized in that the outer chamfer is chamfered into a smooth convex curved shape.

According to another embodiment of the present invention, the artificial knee joint according to the present invention is characterized in that the inner chamfer is chamfered into a smooth concave curved shape which is recessed inwardly.

According to another embodiment of the present invention, the artificial knee joint according to the present invention, the bearing member includes a rear projection protruding upward from the rear, the rear projection includes a rear chamfer formed by chamfering downward to a certain depth; The rear chamfer is characterized in that it can prevent the collision with the ligaments.

According to another embodiment of the present invention, the artificial knee joint according to the present invention is characterized in that the rear chamfer is chamfered into a smooth curved shape recessed.

According to another embodiment of the present invention, the artificial knee joint according to the present invention is chamfered in a smooth convex curved shape at the outer edge of the posterior joint end of the femoral joint member, which is coupled to the distal end of the femur. It is characterized by including an outer chamfer to prevent ligament damage by preventing a collision with the side ligament.

According to another embodiment of the present invention, the artificial knee joint according to the present invention further comprises an inner chamfer chamfered into a smooth concave curved shape in which the femoral coupling member is inwardly recessed from the inner edge of the posterior joint end. By preventing the collision with the posterior cruciate ligament is characterized in that to prevent damage to the ligament.

According to another embodiment of the present invention, the artificial knee joint according to the present invention is a bearing member located between the femur coupling member and the tibia coupling member, wherein the bearing member includes a rear protrusion protruding upward from the rear thereof. The rear protruding portion includes a rear chamfer chamfered in a concavely curved curved shape, and the rear chamfer can prevent collision with the ligaments.

According to another embodiment of the present invention, the artificial knee joint according to the present invention, the bearing member further includes a front projection protruding upward from the front, the front projection is formed higher than the height of the rear projection is natural It is characterized by being able to prevent knee movement and anterior dislocation.

As described above, the present invention can achieve the following effects by the combination of the above-mentioned problem solving means and the configuration to be described later, the operation relationship.

According to the present invention, in the conventional artificial knee joint, the side ligaments collide due to the horizontal axis of rotation of the femoral coupling member due to the outer edge of the femoral coupling member. By including an outer chamfer on the outer edge of the rear joint end of the femoral coupling member can prevent the ligament damage by preventing the collision with the side ligament.

According to the present invention, the posterior cruciate ligament existing in the inner side of the artificial knee joint of the conventional CR type has a problem that the ligaments are damaged by colliding with the inner edges according to the transverse rotation of the femur coupling member in the plane. An inner chamfer may be included at the inner edge of the posterior joint end of the member to prevent collision with the posterior cruciate ligament, thereby preventing the ligament from being damaged.

According to the present invention, when the knee joint is fully extended in the conventional artificial knee joint, there is a case in which the posterior ligament collides with the posterior protrusion of the bearing member and the ligament is damaged. The rear chamfer may be included in the rear protrusion of the bearing member to prevent ligament damage.

According to the present invention, in the conventional artificial knee joint, pain caused by collision with the ligaments and seriously inflamed, causing the disease, in order to prevent this, by placing a chamfer on the femoral coupling member and the bearing member to the ligaments It does not involve pain and can achieve the effect of forming a more stable artificial knee joint.

1 is a view showing a state in which a conventional artificial knee joint is performed

Figure 2 is a rear view of the femur joint member of the conventional PS type artificial knee joint

Figure 3 is a rear view of the femur coupling member of the conventional CR type artificial knee joint

4 is a view showing the horizontal axis twist rotation of the conventional artificial knee joint

5 is a diagram illustrating a horizontal axis twist rotation of a conventional artificial knee joint

Figure 6 is a rear view of the femur coupling member of the PS type artificial knee joint according to an embodiment of the present invention

Figure 7 is a rear view of the femur coupling member of the CR type artificial knee joint according to an embodiment of the present invention

8 is a perspective view of a bearing member in the artificial knee joint according to another embodiment of the present invention

Hereinafter, with reference to the accompanying drawings, a configuration and a preferred embodiment of the artificial knee joint device for preventing a ligament damage according to the present invention will be described in detail.

Figure 2 is a rear view of the femoral coupling member of the conventional PS type artificial knee joint, Figure 3 is a rear view of the femoral coupling member of the conventional CR type artificial knee joint, Figure 4 is a view showing a horizontal transverse axis twist rotation of the conventional artificial knee joint. 5 is a view showing a horizontal transverse twisting rotation of the artificial knee joint, Figure 6 is a rear view of the femoral coupling member of the PS type artificial knee joint according to an embodiment of the present invention, Figure 7 is a view of the present invention Figure 8 is a rear view of the femur coupling member of the CR type artificial knee joint according to one embodiment, Figure 8 is a perspective view of a bearing member in the artificial knee joint according to another embodiment of the present invention.

Prior to describing the artificial knee joint according to the present invention, due to the outer edge (19a) and the inner edge (19b) of the posterior articular end 19 of the femoral coupling member 10 of the conventional artificial knee joint of Figures 2 and 3 The ligament damage will be examined and the problems caused by ligament damage due to twisting rotation of the transverse transverse axis of the femoral coupling member 10 and the bearing member 50 in the conventional artificial knee joint shown in FIGS. 4 and 5 will be described. . First, Figure 2 shows a PS type femoral member 10 for removing and performing the posterior cruciate ligament in the conventional artificial knee joint, so that the femur coupling member 10 includes an outer edge 19a of the posterior joint end. 4 and 5, when the femoral coupling member 10 has a horizontal axial twisting rotation of the bearing member 50, the protruded outer edge 19a protrudes. Collide with the lateral ligaments. As a result, the lateral ligaments may be damaged due to frequent bumps and friction, and may cause pain and, in serious cases, inflammation. Next, Figure 3 is shown for the femoral coupling member 10 to be performed without removing the posterior cruciate ligament in the conventional artificial knee joint, according to the femoral coupling member 10 is the inner corner ( 19b). Accordingly, the posterior joint end inner edge (19b) is to collide with the posterior cruciate ligament in the middle when the femoral coupling member 10 is twisted according to the horizontal transverse axis of the bearing member 50 as described above. As a result, the posterior cruciate ligament is damaged, causing a problem that causes pain and inflammation. In order to solve these problems, the artificial knee joint of the present invention is to prevent the formation of a chamfer at the end of the posterior joint of the femoral coupling member.

Hereinafter, the artificial knee joint according to the present invention will be described in detail with reference to FIGS. 6 to 8. Artificial knee joint of the present invention is the cartilage between the femur coupling member 100 and the femur coupling member 100 and the tibial coupling member shown in FIG. 8 coupled to the lower end of the tibia side of the femur shown in FIGS. 6 and 7 And a bearing member 500 that serves. Accordingly, the femur coupling member 100 is in contact with the bearing member 500 and friction, and the bearing member is subjected to a stress according to the load transmitted from the upper portion of the femur coupling member. In addition, the femur coupling member and the bearing member is in contact, when the leg is moved due to the ligament, the tibia can move back and forth, and also can move left and right. Therefore, it is desirable to maintain the various contact points according to the curvature of the contact portion of the femur coupling member and the bearing member by the movement of the knee joint, so as to properly distribute the stress.

The femur coupling member 100 has a U-shape as a whole and is made of a material of biocompatibility, the upper portion has a portion that can be accommodated so that the femur can be coupled, and the lower portion has a curved surface having various curvatures that are slightly spherical. . The femoral coupling member 100 is to cut a portion of the femur so that it can be accommodated in the femoral coupling member 100 and the femur receiving portion is formed inside the U-shape, the femur and the femur at the femur receiving portion It includes a fixing protrusion to be firmly coupled. In addition, the femur coupling member 100 includes a bearing member contact portion 130 of the curved surface to be in contact with the bearing member 500 to be described later, the of the femoral coupling member designed in the artificial knee joint of the PS type The case includes a cam 170 connected between both posterior condyles, and includes a posterior posterior end 190 located at the distal end of the posterior condyle of the femoral coupling member.

The femur accommodation portion is firmly coupled to the lower incision surface of the femur as a portion corresponding to the upper inside of the U-shape of the femur coupling member 100. Accordingly, the surface of the femur accommodation portion may have a rough surface or may be made of a porous material so as to be firmly coupled to the femur. The fixing protrusion is a protrusion formed so as to be inserted into the femur to the upper side of the femur accommodating portion, and it is more preferable if there is a screw shape or a shape of a shape that can be firmly inserted into the femur to hold the bone tissue of the femur. will be.

The bearing member contact portion 130 is preferably formed in a shape such that when the femur moves in contact with the groove 510 of the bearing member 500 to be described below, the contact area is maximized to allow the stress to be naturally dispersed. Do. Thus, the bearing member contact portion 130 is different from the curvature of the contact portion when viewed from the side and the curvature of the contact portion when viewed from the front side, such that having a different curvature can be a natural movement even when the front and rear knee joint movement and At the same time, it is possible to disperse the stress by increasing the contact area, and even in the case of a slight abduction to the left and right, even when the contact part is slightly lifted on one side, a large stress is concentrated on the other side, thereby maintaining the contact area wide in that part. This is to be distributed.

The cam 170 is a post of the bearing member 500, which will be described below in place of the role of the posterior cruciate ligament in the case of the PS type artificial knee joint to be performed in a state in which the artificial knee joint is removed from the posterior cruciate ligament. 570 is located at the posterior condyle of the femur coupling member 100 to engage with it. The cam 170 is present in the artificial knee joint of the conventional PS type and will not be described in detail below.

The posterior condyle end 190 is a portion that refers to the end of the posterior articular in the U-shaped shape of the femoral coupling member 100 to be able to constitute a chamfer that can be said to the core of the present invention at the end Ligament damage can be prevented. The posterior joint end 190 includes an outer chamfer 191 to prevent damage to the side ligaments and an inner chamfer 193 to prevent damage to the posterior cruciate ligament in the case of a CR type artificial knee joint. do.

As shown in FIGS. 4 and 5, the outer chamfer 191 forms a chamfer at the outer edge 19a of the posterior joint end of the conventional femur coupling member 10 of FIG. 2, as shown in FIGS. 6 and 7. The femoral coupling member is configured to prevent damage to the side ligaments by protruding the outer edge 19a of the posterior joint end when the horizontal rotation of the bearing member causes the horizontal axis torsion. Accordingly, the outer edge of the rear end of the posterior spherical sphere in which the outer chamfer 191 is formed is preferably formed in a smooth curved shape as shown in FIGS. 6 and 7, which is the outer edge of the rear joint end 19a. This is because when the cutting is done at an angle, the lateral ligament may be caught even though the chamfer is formed, and it may interfere with the smooth flexion of the knee joint. Through the femoral coupling member 100 including the outer chamfer 191, it may be possible to prevent the side ligaments from being damaged even when the femoral coupling member 100 is twisted in the horizontal plane. .

The inner chamfer 193 is a chamfer formed in the inner edge of the posterior articular of the femoral coupling member in the CR type artificial knee joint of the conventional invention, as shown in Figure 7, due to this inner chamfer 192 of the CR type artificial knee joint In this case, the femur coupling member 100 functions to prevent ligament damage without colliding with the posterior cruciate ligament at the center even if there is a horizontal axis of rotation of the bearing member. The inner chamfer 193 is preferably formed to have a smooth concave curved shape recessed inwardly, which is in the groove 510 of the bearing member 500 in a state where the femur coupling member 100 is sufficiently bent. Since the inner edge of the posterior arthroscopic tip 190 may collide with the posterior cruciate ligament when the horizontal axis is twisted horizontally, the most ideal shape for preventing the collision caused by the twisted rotation is closer to the circular shape. That is, the shape of the inner chamfer 193 has a concave shape in which the shape of the inner chamfer 193 is impregnated so as to prevent collision with the rear cruciate ligament due to the rotation of the transverse cruciate ligament.

The bearing member 500 plays a role similar to that of the human cartilage between the femoral coupling member 100 and the tibia coupling member, which is different from the materials of the femoral coupling member and the tibia coupling member. It is preferable that the material is formed of polyethylene so that the heat is not generated due to the friction and the like, and thus it is resistant to friction, and the surface is smooth to allow natural frictional contact. The bearing member 500 has grooves (Groove, 510) when viewed from the front and the side of the bearing member 500 when viewed from the side when the contact portion 130 of the femur coupling member 100 is in contact thereon. It includes a front protrusion 530 and a rear protrusion 540 formed in. In addition, when the artificial knee joint of the present invention is performed in the PS type, the posterior cruciate ligament may be removed and may include a post 570 to replace the ligament.

The groove portion 510 is a recessed portion formed in both directions of the artificial knee joint of the present invention when viewed from the front of the bearing member 500. The portion is a bearing member contact portion 130 of the femur coupling member 100. In contact with the femur coupling member 100 is a portion that is rubbed when rotating. Therefore, since the load concentrates on this area according to the contact, it is necessary to widen the contact area as much as possible to prevent the concentration of stress. Therefore, it is preferable that the groove portion 510 has a curvature corresponding to the bearing member contact portion 130 of the femur coupling member 100. Accordingly, as described in the configuration of the bearing member contact portion 130, if the sound slightly to the left and right will be in contact with only one side, the stress will be concentrated, it is possible to achieve the effect that the stress can be dispersed by increasing the contact area will be.

The front protrusion 530 and the rear protrusion 540 may be formed to be different in height from the front and rear portions of the bearing member 500 as protruding upwards, and the height of the front protrusion 530 is rearward. It is formed to be higher than the height of the protrusion 540, which is to prevent natural knee movement and anterior dislocation. The front protrusion 530 and the rear protrusion 540 protrude a certain height from the front and the rear when the bearing member 500 is viewed from the side, in particular, the front protrusion 530 is the height of the rear protrusion In order to prevent the femoral coupling member 100 from being separated from the bearing member 500 when the patient who has performed the artificial knee joint of the present invention by bending the knee at a large angle with a certain height higher than the height of 540. The rear protrusion 540 has a height lower than that of the front protrusion 530 to prevent dislocation when the knee is bent and rolled back at a large angle, thereby enabling stable knee joint movement. Accordingly, the rear protrusion 540 may be bent slightly forward when the knee is completely extended. Accordingly, the rear protrusion and the rear ligament collide with each other to cause ligament damage. 541).

The rear chamfer 541 is the core of the present invention, even if the rear projections in the bearing member, even if the low protruding contact with the posterior ligament may cause damage to the posterior ligament can cause pain and inflammation. In order to solve this problem, a chamfer having a smooth curved shape concavely recessed in the rear protrusion 540 is formed in the rear protrusion 540 to prevent the rear ligament from colliding. As a result, the collision with the posterior ligament can be prevented through the rear chamfer 541 and the ligament injury prevention, which is the object of the present invention, can be realized, thereby realizing more stable artificial knee joint.

The post 570 is a portion protruding upward in the central portion of the bearing member 500 to replace the role of the posterior cruciate ligament removed when the artificial knee joint of the present invention is operated in the PS type. Since the configuration of the post 570 is well known to those skilled in the art, detailed description thereof will be omitted.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the operating relationship and the use of the artificial knee joint device according to the present invention will be described in detail.

Figure 6 is a rear view of the femur coupling member of the PS type artificial knee joint according to an embodiment of the present invention, Figure 7 is a rear view of the femur coupling member of the CR type artificial knee joint according to an embodiment of the present invention, Figure 8 Is a perspective view of a bearing member in an artificial knee joint according to another embodiment of the present invention.

Looking at the operation relationship of the artificial knee joint of the present invention with reference to Figures 6 to 8, first to describe the artificial knee joint according to an embodiment of the present invention with reference to Figure 6 the femur coupling member 100 is the end of the posterior joint When the artificial knee joint of the present invention is included in the 190 including the outer chamfer 191 to prevent the collision with the ligaments of the side function to prevent damage to the ligaments. This is because the knee of the human body does not only move forward and backward, but because the femoral coupling member in contact with the upper surface of the bearing member also rotates in the horizontal axis, the rear joint end of the femoral member collides with the lateral ligament. The outer edge of the end is cut to form a chamfer. In addition, the outer chamfer 191 is preferably made of a smooth curved shape protruding outward, which is to minimize the damage to the side ligament when there is a horizontal axis of rotation of the femur coupling member 100, and more Furthermore, in order to enable a smooth rotational movement of the knee joint.

Next, referring to the artificial knee joint according to another embodiment of the present invention with reference to FIG. 7, the femoral coupling member 100 includes an inner chamfer 193 as well as an outer chamfer 191 at the rear joint end 190. In the case of CR type artificial knee joint, which is performed without removing the posterior cruciate ligament, the femoral coupling member of the femur coupling member is prevented because it is collided with the posterior cruciate ligament in the center by the horizontal axis twist rotation of the femoral coupling member as described above. The inner edge of the posterior joint end was cut to form a chamfer. The inner chamfer 193 may be formed in a gentle curved shape indented into the inner, such that the indented curved shape is formed, the femoral coupling member 100 is rotated in the horizontal axis on the top of the bearing member 500 This is because it is most preferable to form the chamfer of the inner edge of the rear articular end 190 is close to the circle around the axis because it rotates around the posterior cruciate ligament of the center.

Referring to another embodiment of the present invention with reference to Figure 8, the bearing member 500 of the present invention includes a rear chamfer 541, which is bent slightly forward when the actual knee is fully extended, so The rear protrusion and the rear ligament included in the bearing member 500 collide with each other, thereby causing a problem of damaging the ligament on the rear side. In order to solve this problem, the bearing member 500 of the present invention cuts the conventional rear protrusion to form the rear chamfer 541 so as not to collide with the ligament on the rear side. In addition, the rear chamfer 541 preferably has a curved shape recessed inward. As a result, the artificial knee joint for preventing ligament injury of the present invention can be realized.

The above-described embodiment is merely a preferred embodiment for a person having ordinary knowledge in the art to which the present invention pertains (hereinafter referred to as a person skilled in the art) to easily carry out the artificial knee joint according to the present invention. And because it is not limited to the accompanying drawings for this reason it is not limited to the scope of the present invention. Therefore, it will be apparent to those skilled in the art that various substitutions, modifications, and changes can be made without departing from the technical spirit of the present invention, and it is obvious that parts easily changed by those skilled in the art are included in the scope of the present invention.

Claims

In the artificial knee joint comprising a femur coupling member coupled to the distal end of the femur, a tibia coupling member coupled to the distal end of the tibia, and a bearing member located between the femur coupling member and the tibia coupling member,

The femur coupling member includes an outer chamfer chamfered at the outer edge of the posterior joint end of the artificial knee joint to prevent the ligament damage by preventing a collision with the side ligament.
The method of claim 1,

The femur coupling member further comprises an inner chamfer chamfered at the inner edge of the posterior joint end of the artificial knee joint to prevent the ligament damage by preventing a collision with the posterior cruciate ligament.
2. The knee joint of claim 1, wherein the outer chamfer is chamfered in a gentle convex curved shape.
3. The artificial knee joint for preventing ligament injury according to claim 2, wherein the inner chamfer is chamfered into an inwardly concave curved surface.
The method according to any one of claims 1 to 4,

The bearing member includes a rear protrusion protruding upward from the rear thereof, and the rear protrusion includes a rear chamfer formed by chamfering downward to a predetermined depth, and the rear chamfer prevents collision with the ligaments. Artificial knee joint for preventing ligament injury.
The method of claim 5,

The rear chamfer is an artificial knee joint for preventing ligament injury, characterized in that the chamfered in the shape of a smooth curved recessed.
In the femur joint, which is joined to the distal end of the femur,

Femoral coupling member to prevent the ligament damage by preventing the collision with the side ligament including an outer chamfer chamfered in a smooth convex curved shape at the outer edge of the end of the posterior joint of the femur joint member.
8. The ligament injury of claim 7, wherein the femoral coupling member further comprises an inner chamfer chamfered in a gentle concave curved shape that is recessed inwardly from the inner edge of the posterior joint end to prevent a collision with the ligament ligament. Femur coupling member to prevent the.
A bearing member positioned between the femur coupling member and the tibial coupling member, wherein the bearing member includes a rear protrusion protruding upward from the rear thereof, and the rear protrusion is chamfered into a concavely inclined smooth curved shape. And a chamfer, wherein the rear chamfer can prevent collision with the ligaments.
10. The method of claim 9, wherein the bearing member further comprises a front projection protruding upward from the front, wherein the front projection is formed higher than the height of the rear projection to prevent natural knee movement and forward dislocation The bearing member characterized by the above-mentioned.