KR100549707B1 - Artificial metal on metal bipolar femoral head - Google Patents

Abstract

The present invention relates to a wear-resistant metal-to-metal bipolar artificial hip joint, and more particularly, by thermally fusion-bonding the shock absorbing member to the outside of the inner liner to smoothly support the vertical load of the human body, and to wear the inner liner with high wear The present invention relates to a wear-resistant metal-to-metal bipolar artificial hip head that can be provided with a cobalt alloy to minimize wear rate.

An object of the present invention by combining the shock absorbing member made of polyethylene polymer on the outside of the inner liner of the bipolar artificial hip head integrally, the fixing force is improved to smoothly absorb the impact applied to the artificial hip joint by the vertical load of the human body In addition, it is possible to prevent slippage of the inner liner even when a rotational force is applied during the rotation of the inner head, and the inner wear of the chrome-cobalt alloy having high wear resistance can be smoothly provided by providing the inner liner with high abrasion resistance. At the same time, it is possible to minimize the wear rate to provide a bipolar artificial hip head that can prevent the osteolysis caused by the wear particles in advance.

The configuration of the present invention for achieving the above object, bipolar cartilage in the pelvic bone, and the bipolar artificial hip joint coupled to the neck of the femoral stem is rotatably coupled to one side and the other side is inserted into the femur bone In the head, the outer head (10) is formed in a hemispherical shape so as to be rotatably inserted into the non-chondral cartilage (7) and the removable groove (11) formed in the inner lower portion; It is provided in the hemispherical shape so as to be inserted into the outer head 10, the support jaw 21 is protruded to the inner lower portion, and the step-shaped first slip prevention jaw 22 is formed on the upper side thereof, the detachable protrusion 23 on the outer lower portion Shock absorbing member (20) protruding; An inner liner (30) formed of a metal material having a stepped second slip prevention jaw (32) formed at an outer side thereof so as to be bound to the first slip prevention jaw (22) of the shock absorbing member (20); Coupling means for integrally coupling the shock absorbing member 20 and the inner liner 30; One side is rotatably inserted into the inner liner 30 in a ball-and-socket manner, and the other side is formed of an inner head 50 made of metal coupled to the neck portion 5 of the femoral stem 4. It is done.

Also preferably, a ring-shaped release preventing member 40 is further provided to be flowably inserted into the shock absorbing member 20 so that one side is cut in such a way that the inner head 50 may be elastically in contact with each other without being separated. It is characterized by.

Bipolar, Hip, Head, Liner, Stem

Description

Wear-resistant metal-to-metal bipolar artificial hip head {Artificial metal on metal bipolar femoral head}

1 is a cross-sectional view showing the operation of the wear-resistant metal to metal bipolar artificial hip head according to the present invention,

2 is a cross-sectional view showing a separated state of FIG.

3 is a cross-sectional view taken from "A-A" of FIG.

Figure 4 is a cross-sectional view showing another embodiment of the coupling means of the shock absorbing member and the inner liner according to the present invention,

5 is a perspective view of the shock absorbing member according to the present invention;

6 is a perspective view of the separation prevention member according to the present invention;

Figure 7 is a cross-sectional view showing a separation state of a conventional bipolar artificial hip head.

<Description of Symbols for Major Parts of Drawings>

1: femur 2: femur

3: femoral stem 4: stem

5: neck 6: pelvic bone

7: aspheric cartilage 10: outer head (Outer Head)

11: removable groove 20: shock absorbing member

21: support jaw 22: first slip prevention jaw

23: detachable protrusion 24: fixing groove

25: Incision groove 30: Inner Liner

31: fixing protrusion 32: second slip prevention jaw

40: release preventing member 41: elastic clamp

50: inner head

The present invention relates to a wear-resistant metal-to-metal bipolar artificial hip joint, and more particularly, by thermally fusion-bonding the shock absorbing member to the outside of the inner liner to smoothly support the vertical load of the human body, and to wear the inner liner with high wear The present invention relates to a wear-resistant metal-to-metal bipolar artificial hip head that can be provided with a cobalt alloy to minimize wear rate.

In general, the hip joint is composed of a ball-shaped femoral ball head and a socket-shaped acetabular tube surrounding the hip joint, and is one of the very important joints that connects the lower extremities to the pelvis to enable walking.

In addition, the femoral head and the acetabular surface are covered with a very soft structure called supernatural bone to serve to absorb or cushion the impact applied to the joint.

The hip joint is surrounded by articular capsules, and the inner surface of the joint capsule secretes a lubricant having excellent lubricating action called joint fluid, which makes the joint movement more smoothly than sliding ice on ice. Of course, healthy muscles and ligaments are essential for maintaining proper position and normal walking of the hips, and the muscles are in charge of basic hip joint movements such as rotation, adduction, and abduction.

However, such femurs cannot obtain bone union due to aging of the human body, or when there are diseases such as osteoarthritis, avascular necrosis of the femoral head, joint fractures of the femur, and intertrochanteric fractures, the femur cannot function faithfully.

Therefore, the femoral bone of the patient is replaced with an artificial hip joint, thereby enabling the patient to walk. The types of hip arthroplasty are classified into unipolar hip implants, bipolar hip implants, and total hip arthroplasty.

As shown in FIG. 5, the bipolar artificial hip head used for the bipolar hip arthroplasty is inserted into the non-chondral bone 107 in the pelvic bone of the pelvic bone 106 and the non-chondral bone 107 and is chromium-cobalt. An outer head 110 made of alloy or stainless steel, a polyethylene inner liner 30 installed inside the outer head 110, and a femoral stem located inside the inner liner 30. It consists of a ball-shaped inner head 140 that is coupled to the neck portion 105 of the 103.

The bipolar artificial hip joint first couples the inner head 140 to the neck portion 105 of the femoral stem 103, and the inner liner 30 and the outer head 110 above the inner head 140. Combined with each of the non-orbital cartilage 107 is inserted to complete the installation.

However, in the conventional bipolar hip joint constructed as described above, the inner liner 30 is made of polyethylene, and wear is caused by the inner head 140 that is rotated inside the inner liner 30. There was a problem that caused osteolysis, which dissolves the bone around the artificial hip by the fine particles.

In addition, when the osteolysis occurs, it is necessary to perform a reoperation to replace the artificial hip head, but it is easy to separate the outer head 110 and the inner liner 30 when the bipolar hip head is completely mounted. There was a disadvantage that the operation is complicated and time-consuming.

In addition, since the fixing force between the outer head 110 and the inner liner 30 is not good, when the outer head 110 and the inner head 140 rotate, the inner force of the inner liner 30 is caused by the rotational force. In this case, the outer head 110 is slipped, and each subcomponent of the bipolar artificial hip head is distorted, which causes a problem of damaging the component.

The present invention has been made to solve the above problems, an object of the present invention is to integrally combine the shock absorbing member provided with polyethylene polymer on the outside of the inner liner of the bipolar hip joint head, thereby improving the fixing force of the human body Not only can the shock applied to the artificial hip joint be absorbed by the vertical load, but also the slippage of the inner liner can be prevented even if the rotational force is applied during the rotation of the inner head. By providing this excellent chromium-cobalt alloy, it is possible to induce a smooth rotation of the inner head and at the same time to minimize the wear rate to provide a bipolar artificial hip head that can prevent the osteolysis caused by wear particles in advance.

The configuration of the present invention for achieving the above object, bipolar cartilage in the pelvic bone, and the bipolar artificial hip joint coupled to the neck of the femoral stem is rotatably coupled to one side and the other side is inserted into the femur bone In the head, the outer head (10) is formed in a hemispherical shape so as to be rotatably inserted into the non-chondral cartilage (7) and the removable groove (11) formed in the inner lower portion; It is provided in the hemispherical shape so as to be inserted into the outer head 10, the support jaw 21 is protruded to the inner lower portion, and the step-shaped first slip prevention jaw 22 is formed on the upper side thereof, the detachable protrusion 23 on the outer lower portion Shock absorbing member 20 of the elastic material protruding; An inner liner 30 having a stepped second slip prevention jaw 32 formed at an outer side thereof so as to be bound to the first slip prevention jaw 22 of the shock absorbing member 20; Coupling means for integrally coupling the shock absorbing member 20 and the inner liner 30; One side is rotatably inserted into the inner liner 30 in a ball-and-socket manner, and the other side is formed of an inner head 50 made of metal coupled to the neck portion 5 of the femoral stem 4. It is done.

Also preferably, a ring-shaped release preventing member 40 is further provided to be flowably inserted into the shock absorbing member 20 so that one side is cut in such a way that the inner head 50 may be elastically in contact with each other without being separated. It is characterized by.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view showing a surgical state of the wear-resistant metal-to-metal bipolar artificial hip head according to the present invention, FIG. 2 is a cross-sectional view showing the separated state of FIG. 1, FIG. 4 is a cross-sectional view showing another embodiment of a coupling means of the shock absorbing member and the inner liner according to the present invention, FIG. 5 is a perspective view of the shock absorbing member according to the present invention, and FIG. A perspective view of the preventing member.

As shown in the figure, the present invention is formed in a hemispherical shape so as to be rotatably inserted into the non-choral cartilage (7) and the non-choral cartilage (7) fixed to the pelvic bone of the pelvic bone (6) Outer head (10) of the alloy material (11) is formed and provided with a hemispherical shape so as to be inserted into the outer head 10, the support jaw 21 protrudes to the inner lower side and stepped upwards The first slip prevention jaw 22 is formed, and is attached to the shock absorbing member 20 of the elastic material and the first slip prevention jaw 22 of the shock absorbing member 20 protruding from the detachable protrusion 23 on the outer lower portion. A coupling means for integrally coupling the inner liner 30 of the metal material having the step-shaped second slip prevention jaw 32 to the outside, and the shock absorbing member 20 and the inner liner 30 in one body; One side is inserted into the inner liner 30 so as to be rotatable in a ball and socket manner. And, the other side is composed of the inner head (Inner Head, 50) of metallic material coupled to the neck (5) of the stem (4).

An elastic clamp 41 is provided at an outer side of the impact absorbing member 20 so as to be fluidly inserted into the shock absorbing member 20 so that the inner head 50 is elastically contacted with one another, and one side is cut off. It further comprises a prevention member (40).

The release preventing member 40 is made of an elastic polyethylene material, and provided with a larger than the inner diameter of the lower portion of the impact absorbing member 20, by pressing both sides to elastically insert the inside of the impact absorbing member (20). In this case, while being expanded by the elastic restoring force, the impact absorbing member 20 is not separated.

Here, the elastic clamp 41 is also formed of a circular linear material cut on one side, it will be preferable to be provided with a shape memory alloy of the elastic material so as to press the separation preventing member 40 from the outside to the inside.

The outer head (10) is rotated on the inner circumferential surface of the non-coccal bone (7), the outer surface is smoothly processed for smooth lubrication, so as to minimize the wear rate when friction with the non-coccal bone (7) It is provided with a metal having a good wear resistance such as chromium-cobalt alloy or stainless steel, and the plurality of detachable grooves 11 are provided below the inner circumferential surface.

The shock absorbing member 20 has a strong impact resistance against the vertical load of the human body, and is provided with a polyethylene polymer so as to easily absorb the impact applied to the artificial hip joint, when inserted into the inside of the outer head 10, When pressed against the side, the detachable protrusion 23 is naturally locked to the detachable groove 11 by the elastic restoring force.

In addition, when the inner liner 30 and the inner head 50 are inserted by forming a plurality of cutout grooves 25 under the impact absorbing member 20, a portion in which the cutout grooves 25 are formed naturally expands. The inner head 50 may be smoothly inserted into the shock absorbing member 20.

The inner liner 30 is a contact part in which the inner head 50 is rotated, and is heavily worn, and is provided with a wear-resistant chromium-cobalt alloy to prevent osteolysis caused by wear. The inner circumferential surface of the inner liner 30 is smoothly processed to induce smooth rotation of the inner head 50.

Coupling means for integrally coupling the shock absorbing member 20 and the inner liner 30, the fixing groove 24 formed in the inner lower portion of the shock absorbing member 20 and the plurality of fixing grooves 24 It is composed of a fixing protrusion 31 protruding on the outside of the inner liner 30 to be bound to.

In addition, as another embodiment of the coupling means, as shown in Figure 4, the shock absorbing member 20 may be thermally fused to the outside of the inner liner 30 to be integrally attached.

As described above, the shock absorbing member 20 and the inner liner 30 are integrally coupled by a coupling means, but the first and second slip prevention jaws 22 and 32 are coupled to each other to bind the non-coccal bone 7 When the outer head 10 rotates in the inner side and the inner head 50 rotates in the inner liner 30, the shock absorbing member 20 and the inner liner are rotated by the transmitted rotational force. It is possible to smoothly support the rotation of both sides without the phenomenon that the slip 30 occurs.

 When explaining the operation and effect of the present invention configured as described above based on the procedure of bipolar artificial hip joint, the surgical site is disinfected after anesthetizing the damaged patient, and the hip joint is exposed after cutting the skin about 15 cm.

Subsequently, the femoral head is dislocated from the pelvic acetabular portion, the outer head 10 is rotatably inserted into the acetabular cartilage 7, the diseased femoral head is cut out and the femoral bone marrow is cleaned, followed by artificial femoral stem (2). To the femur 2 of the thigh 1.

In addition, the inner head 50 is coupled to the neck portion 5 of the upper part of the femoral stem 3 by a fitting method, wherein the inner insertion grooves of the neck portion 5 and the inner head 50 are formed in a tapered shape. By doing so, the coupling may be easily performed.

Subsequently, the outer head 10 is fixed to the non-coccal cartilage 7, and the outer head 10 is manufactured in various sizes at intervals of 1 mm from 40 mm to 66 mm so that the outer head 10 can be used according to the size of the patient's pelvis. The outer head 10 of the appropriate size is selected and fixed according to the condition, size, and the like of the patient.

Thereafter, the inner liner 30 is coupled to the inner side of the shock absorbing member 20, and the first and second slip prevention jaws 22 and 32 are engaged, and the fixing protrusion 31 of the inner liner 30 is impacted. Combining integrally to be inserted into the fixing groove 24 of the absorbing member 20 by pressing both sides of the lower portion of the shock absorbing member 20 made of polyethylene polymer to be inserted into the outer head 10 and then placed, As the shock absorbing member 20 returns to its initial state by the elastic restoring force, the detachable protrusion 23 is naturally locked to the detachable groove 11 of the outer head 10.

Here, the inner liner 30 has the fixing protrusion 31 protruding portion is larger than the inner diameter of the impact absorbing member 20, which is the impact absorbing member 20 by a plurality of cutting grooves (25) As the lower portion of the) is naturally expanded, it will be able to smoothly insert the inner liner (30).

As another embodiment of the coupling means for coupling the impact absorbing member 20 and the inner liner 30, as shown in Figure 4 by heat-sealing the impact absorbing member 20 to the outside of the inner liner (30) You can also use

When the shock absorbing member 20 and the inner liner 30 are coupled to each other, the ring-shaped release preventing member 40 having the elastic clamp 41 is provided to the inner liner 30. After insertion, the inner liner 30 extends the inner head 50 coupled to the neck 5 of the femoral stem 3 with a cutout portion 15 of the shock absorbing member 20 formed therein. It is rotatably inserted inward.

When the inner head 50 is inserted into the inner liner 30, the bottom of the inner head 50 is seated on the support jaw 21 under the shock absorbing member 20 to prevent the first departure. In addition, the separation preventing member 40 is moved downward by its own weight to be in close contact between the shock absorbing member 20 and the inner head 50 so that the inner head 50 is not separated.

After the bipolar artificial hip head is installed in the above process, the operation is completed by suturing the surgical site.

The shock absorbing member 20 of the present invention is provided with a polyethylene polymer can smoothly absorb or buffer the impact applied to the artificial hip joint by the vertical load of the human body that is delivered to the artificial hip joint after surgery. The inner liner 30 is made of a metal material having excellent wear resistance, so that the wear rate generated as the inner head 50 of the metal material is rotated in contact with the inner side of the inner liner 30 can be minimized. Osteolysis caused by wear particles can be prevented.

In addition, the shock absorbing member 20 and the inner liner 30 are integrally coupled by the coupling means to bind the first and second slip prevention jaws 22 and 32, thereby rotating both sides, that is, the outer head 10. And the inner head 50 rotates so that the shock absorbing member 20 and the inner liner 30 do not slip or flow, resulting in distortion of the artificial hip head. It is a medically very useful invention that can prevent damage of each sub element beforehand.

As described above, specific embodiments of the present invention have been described in detail, but those skilled in the art will appreciate that various modifications can be made without departing from the scope of the present invention.

Therefore, the scope of the present invention should not be limited to the above-described embodiments, but should be defined not only by the claims below, but also by those equivalent to the claims.

As described above, according to the present invention, by integrally overlapping the shock absorbing member made of polyethylene polymer on the outside of the inner liner of the bipolar hip joint, it is applied to the artificial hip by the vertical load of the human body generated during walking after surgery. There is an advantage that can smoothly absorb or cushion the impact.                     

In addition, the filling absorbing member and the inner head may be firmly coupled to each other by a coupling means such that slip or flow does not occur due to rotational force when the outer head and the inner head are rotated, and the support jaw and the separation prevention of the shock absorbing member are prevented. Since the inner head which rotates by the member can be supported so as not to be separated, there is an effect that stability is improved.

In addition, the inner liner, which is badly worn by rotation of the inner head, is provided with a chromium-cobalt alloy having excellent abrasion resistance, thereby inducing smooth rotation of the inner head, and having a low wear rate, thereby causing osteolysis due to wear particles. There is an advantage that can minimize.

Claims (6)

In the bipolar cartilage in the pelvic bone, and one side is rotatably coupled to the acetabular cartilage, the other side is coupled to the neck of the femoral stem inserted into the femur, An outer head (10) formed in a hemispherical shape so as to be rotatably inserted into the non-chondral cartilage (7) and having a detachable groove (11) formed at an inner lower portion thereof; It is provided in the hemispherical shape so as to be inserted into the outer head 10, the support jaw 21 is protruded to the inner lower portion, and the step-shaped first slip prevention jaw 22 is formed on the upper side thereof, the detachable protrusion 23 on the outer lower portion Shock absorbing member (20) protruding; An inner liner (30) formed of a metal material having a stepped second slip prevention jaw (32) formed at an outer side thereof so as to be bound to the first slip prevention jaw (22) of the shock absorbing member (20); Coupling means for integrally coupling the shock absorbing member 20 and the inner liner 30; One side is rotatably inserted into the inner liner 30 in a ball-and-socket manner, and the other side is formed of an inner head 50 made of metal coupled to the neck portion 5 of the femoral stem 4. Wear-resistant metal-to-metal bipolar artificial hip head. The method of claim 1, An elastic clamp 41 is provided on the outside so as to be fluidly inserted into the shock absorbing member 20 to elastically close the inner head 50 so as not to be separated, and a ring-shaped release preventing member having one side cut off. Wear-resistant metal to metal bipolar artificial hip head, characterized in that 40 is further provided. The method of claim 1, Wear-resistant metal-to-metal bipolar artificial hip joint, characterized in that a plurality of cutouts 25 are formed in the lower portion of the shock absorbing member 20 so that the inner head 50 is smoothly inserted. The method of claim 1, wherein the coupling means, A fixing groove 24 formed in the inner lower portion of the shock absorbing member 20; Wear-resistant metal-to-metal bipolar artificial hip head, characterized in that consisting of a fixing protrusion 31 protruding on the outside of the inner liner (30) to be fixed to the fixing groove (24). The method of claim 1, wherein the coupling means, Wear-resistant metal-to-metal bipolar artificial hip joint, characterized in that the heat-absorbing to integrally attach the shock absorbing member 20 to the outer side of the inner liner (30). The method according to any one of claims 1 to 5, The shock absorbing member 20 is a wear-resistant metal-to-metal bipolar artificial hip joint, characterized in that the impact resistance to the vertical load of the human body is provided with a polyethylene polymer to facilitate the detachable to the outer head (10).

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