KR20030025093A - the joint structure and method manufacture which joint ceramic - Google Patents

Abstract

PURPOSE: Structure of artificial articulation using ceramic and method for producing the same is provided to prevent dislocation by abrasion and/or weariness and also reduce the weight of an artificial articulation. CONSTITUTION: The structure of artificial articulation using ceramic and method for producing the same having an acetabulum, an acetabulum cup and a stem comprises a process for mixing ceramic material and sub-material, wherein the ceramic material is suitable for the acetabulum cup and acetabulum; a process for conglobulating by spraying a mixture in a chamber, wherein the mixture consists of 100 weight% of composed ceramic powder and 0.3-0.7 weight% of bind methylcellulose; a process for molding the conglobulated ceramic power to make the respective shapes of the acetabulum cup and a drift preventing ring and a acetabulum ball stem with a pressure of 1 to 2 ton/cm¬2; a process for sintering the workpiece for 2 to 4 hours at 800 to 1200 deg.C and for 4 to 6 hours at 1500 to 1700 deg.C in a sintering chamber; a process for abrasing the interior of the acetabulum cup and the exterior of the acetabulum ball; and a process for forming fixing hole.

Description

The joint structure and method manufacture which joint ceramic}

The present invention relates to an artificial joint that can be replaced when the hip, knee, ankle, spinal skull and the like is damaged. More specifically, the abrasion resistance, chemical resistance, bending strength, tensile strength, durability, corrosion resistance, and flexibility hardness of artificial joints are superior to those of plastics and titanium. The present invention relates to a method for manufacturing artificial joints, which can be used without a breakdown and long-term failure, and in particular, the activation of cells is made by using ceramics having lightened artificial joints so that the user's cells and artificial joints can be fused.

Artificial joints are a special structure where two bones or two or more bones of the human body meet, and the ends of the bones that make up the joint are composed of supernatural bones that slide smoothly and well. Therefore, the supernatural bone is like a cushion that can withstand external forces or severe pressure, and the bone moves well without pain. The joint is covered with a soft joint capsule covered with blood veins, and the synovial membrane inside the joint capsule creates slippery joint fluid, which causes the joint to rub or wear out. Prevents falling out

Therefore, artificial joints can be replaced with artificial joints to maintain normal activities when the joints of the patient are damaged and cannot be used. However, the research on the artificial joints has a considerable difference depending on the material used. It is happening.

The artificial joints used up to now are made of stainless steel, cobalt chromium, titanium alloys, and special plastic materials. However, these metal materials have a disadvantage in that abrasion occurs in use, especially in plastics. The fragments are eaten by the macrophages and the immunological action of destroying the macrophages becomes a substance that activates various tissue soluble substances, in particular osteoclasts, so that bone is soluble. Therefore, over time, all artificial joints made of metal and plastic materials have a problem of dislocation caused by wear of artificial joints, external strong physical force and structural defects of artificial joints. there was.

In addition to the above problems, due to a lot of dust and plastic gamma disinfection and fine chuck problem (Infection) is inflamed in the surgical site, these problems may occur immediately after surgery or may occur several years later.

This phenomenon is a problem that the joint metal is relaxed, the joint metal is moved in the bone without the metal attached to the bone.

The present invention has been invented in view of the above problems, the process of preparing each ceramic to form a ceramic material to form acetabular cup, acetabular, anti-separation ring, stem, which is a part of an artificial joint, into a ceramic material, and prepared ceramic Mixing the powder and bind methyl cellulose race and spheroidizing in a chamber at 80 ° C .; In the furnace, acetabular cup, acetabular, anti-separation ring, and stem were formed by a sintering process which was calcined for 2 to 4 hours at a temperature of 800 to 1200 ° C and 4 to 6 hours at 1500 to 1700 ° C and then gradually cooled. Therefore, when the artificial joint is used, the rejection of the user's cell does not occur, so that the bone is not lysed by the macrophages and the activation of the cell is performed. It is to be done.

1 is a block diagram of a method for manufacturing an artificial hip joint according to the present invention.

Figure 2 is a cross-sectional view of the combined acetabular cup, acetabular, anti-separation ring in accordance with the present invention.

Figure 3 is a cross-sectional configuration of the artificial hip joint according to the present invention.

Figure 4a is an arrangement configuration of the friction fixing protrusion of the release prevention ring in accordance with the present invention.

Figure 4b is a cross-sectional view taken along the line A-A of Figure 4a.

<Code Description of Main Parts According to Drawing>

10: Acetabular cup 10 ': Inset groove

11: ace 12: fixed groove

13: Anti mortar ring 14: Groove

15: friction fixing projection 16: stem

20: artificial hip joint

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

In artificial joints made of stainless steel, cobalt chrome, titanium alloy, special plastic, etc.,

Selecting and mixing a ceramic material and a material suitable for an acetabular cup and an acetabular cup;

Mixing 0.3 to 0.7% by weight of bind methyl cellulose race to 100% by weight of the prepared composite cera membrane powder to spheroidize in a chamber at 80 ° C. by a spray method;

Molding the spherical ceramic powder into the shape of acetabular cup, release preventing ring, and acetabular ball stem at a press pressure of 1ton / cm 2 to 2ton / cm 2;

A sintering process after the press molding process, the sintering furnace is fired for 2 to 4 hours at a temperature of 800 to 1200 ° C and 4 to 6 hours at 1500 to 1700 ° C, and then gradually cooled;

Polishing the sintered acetabular outer surface and the acetabular cup inner surface with a polishing machine;

As a process of forming a fixed groove so that the stem is fitted to the ball polished to the full spherical in the polishing process to produce the acetabular cup, acetabular, a non-gut preventing ring.

The coupling structure of the artificial joint 20 manufactured according to the manufacturing method is to be rotated by the built-in acetabular 11 inside the acetabular cup 10 formed of a composite ceramic,

On one side of the acetab 11 is formed a fixing groove 12 whose inner wall is an inclined surface,

The stem 16 is inserted into and fixed to the fixing groove 12, and the separation prevention ring 13 is fixed to the insertion groove 10 ′ of the inlet of the acetabular cup 10 to prevent the acetabular dislocation. 20)

The release preventing ring 13 is made of a plastic material, a plurality of grooves 14 are formed on the inner surface, and the groove 14 is fitted with a friction fixing protrusion 15 made of a composite ceramic so as to be in contact with the outer surface of the acetabular. Joints are formed.

Looking at the embodiment according to the kind of ceramic material of the artificial joint of the present invention manufactured as described above are as follows.

Example 1 Zirconia and Alumina Composite Materials

1st process

Zirconia (ZrO ₂ ) 20 ± 0.5% by weight, alumina (Al ₂ 0 ₃ ) 80 ± 0.5% by weight of zirconia and alumina composite ceramic powder is mixed according to the manufacturing method.

2nd process

In the mixed zirconia and alumina composite ceramic powder 100% by weight, bind 0.3 to 0.7% by weight of bind methyl cellulose.

3rd process

The zirconia and alumina composite ceramics mixed with the water are spheronized in a chamber at 80 ° C. by spraying.

4th process

The spheroidized zirconia and silicon nitride composite ceramic powder is placed in a mold having the shape of each acetabular cup 10 and acetabular ball 11 and press-molded at a press pressure of 1ton / cm 2 to 2ton / cm 2.

5th process

After the press molding process, the sintering furnace is fired for 2 to 4 hours at a temperature of 800 to 1200 ° C. and for 4 to 6 hours at 1500 to 1700 ° C., and then gradually cooled.

In this case, the bind methyl cellulose race mixed with the composite ceramic powder in the second process is burned away during the sintering process.

6th process

The sintered acetabular ball surface and the acetabular cup inner surface are ground in a grinder mixed with diamond powder and then washed.

7th process

In the polishing process, the acetabular ball polished to the perfect true sphere is processed to form the fixing groove 12.

8th process

The parts are washed after completion of processing.

9th process

The stem 16 is fixed to the fixing groove 12 in which the acetabular ball washed after the polishing is processed.

Insert the acetabular (11) fixed to the stem 16 into the acetabular cup (10) and insert the escape prevention ring (13) in the acetabular cup (10) inlet insertion groove (10 ') to prevent the acetabular (11) from being separated. .

The anti-separation ring 13 inserted into the inlet insertion groove 10 ′ of the acetabular cup 10 to support the acetabular portion is formed of a plastic material and has a plurality of grooves 14 on an inner surface thereof to form a plurality of protrusions made of ceramic. Fixing to prevent the direct contact with the release prevention ring (13) when the inside of the acetab (11) flows in the acetabular cup.

The artificial joint 20 assembled as described above is a process of forming the artificial joint 20 by assembling the acetabular cup 10, the acetabular 11, the release preventing ring 13, the stem 16, and the like, respectively. And its structure.

Example 2 Composite Silicon Nitride Material

1st process

95% of prepared silicon nitride (Si ₃ N ₄ ) and 5% of iturium (Y ₂ O ₃ ) are mixed with the composite silicon nitride ceramic powder. The raw material of silicon nitride contains a small amount of titanium nitride (TiN), alumina (Al ₂ O ₃ ) titanium oxide (TiO ₂ ), and the like, which are generally classified as impurities.

2nd process

0.3 to 0.7 wt% of bind methyl cellulose race is mixed with 100 wt% of the mixed composite silicon nitride ceramic powder.

Thereafter, the process consists of the third process spheroidization process, the fourth process press molding process, the fifth process sintering process, the sixth process polishing and cleaning process, the seventh process processing process, the eighth process cleaning process, and the ninth process artificial joint bonding process Is carried out in the same steps as in the third to ninth steps of the first embodiment.

Example 3 Composite Zirconia Material

1st process

The prepared zirconia (ZrO ₂ ) 92.66 to 96.4%, yttrium (Y ₂ O ₃ ) 4.95 to 5.35% composite zirconia ceramic powder is mixed.

2nd process

To the mixed composite zirconia ceramic powder 100% by weight is mixed 0.3 to 0.7% by weight bind methyl cellulose.

Thereafter, the process consisting of the third process spheroidization process, the fourth process press molding process, the fifth process sintering process, the sixth process polishing, the seventh process process, the eighth process cleaning process, and the ninth process artificial joint bonding process is an embodiment. It carries out by the same process as the 3rd process-9th process of 1 and Example 2.

Example 4 Composite Alumina Material

1st process

The silicon nitride ceramic powder composed of 95% of prepared alumina (Al ₂ O ₃ ) and 5% of iturium (Y ₂ O ₃ ) is mixed.

2nd process

To the mixed composite alumina ceramic powder 100% by weight, bind 0.3 to 0.7% by weight of bind methyl cellulose.

Thereafter, the process consists of the third process spheroidization process, the fourth process press molding process, the fifth process sintering process, the sixth process polishing and cleaning process, the seventh process processing process, the eighth process cleaning process, and the ninth process artificial joint bonding process Is also carried out in the same steps as in the third to ninth steps of the first embodiment.

A molding process for pressing the various ceramic powder materials in the form of a ball, a process for sintering at a pressure of 1ton / cm 2 to 2ton / cm 2, a firing temperature of 800 ° C. to 1700 ° C., and the sintered acetabular ball is a diamond powder Mixed with and polished in a polishing machine.

In the polishing process, the acetabular ball that has been completely ground and polished is machined to fit the stem.

At this time, the acetabular cup 10 and the stem 16 are also made of the same process as the molding process such as acetabular ball, and if necessary, the stamp may use a metal material such as titanium.

The acetabular cup 10 and the acetabular cup made of the above are filled with the applied ceramic powder in a mold, pressurized and compressed, and then molded. Then, the sintering furnace is used for 2 to 4 hours at a temperature of 800 to 1200 ° C. at 15,00 ° C. as shown in the graph of Table 1. It is fired for 4 to 6 hours and then proceeds to a slow cooling sintering process.

As can be seen from the above graph, the acetabular cup and the acetabular ball in the sintering furnace gradually rise in temperature during the first 4 hours of sintering, and then form a steel for 2 to 4 hours at 800 to 1200 ° C. The steel is maintained at about 1-6 ° C. for about 4-6 hours, and then gradually descends to cool.

Although the release preventing ring 13 and the stem 16 may be formed as in the method of sintering in the sintering furnace after the molding of the acetabular cup and the acetabular ball, in the present invention, the acetabular cup is placed at the mouth of the acetabular cup in order to reduce the cost The release prevention ring 13, which is capable of supporting the acetabular stem, is used as a plastic material, and a friction protrusion made of ceramic material is used at the inner surface in contact with the acetabular column.

In addition, the additive material mixed with zirconia and alumina ceramic material, silicon nitride ceramic material, zirconia ceramic material, alumina ceramic material, etc. used as the addressing material of the present invention, the weight percent of yttrium oxide (Y ₂ O ₃ ) is included as necessary. It may be contained more or less than the above embodiment.

In addition, jade, ruby, sapphire, crystal and the like can be used as additional materials or main materials.

Looking at the embodiment applied to the acetabular cup, acetabular, separation prevention piece, stem, etc. of the present invention used as the material as described above are as follows.

Material Application Example

① The acetabular cup and the acetabular ceramic material can be selected from zirconia and alumina composite ceramics, composite silicon nitride ceramics, composite zirconia ceramics and composite alumina ceramics.

② The ceramic material of the acetabular cup is selected from zirconia, alumina composite ceramic, composite silicon nitride ceramic, composite zirconia ceramic, and composite alumina ceramic, and the acetabular ceramic material is different from the acetabular cup material and other zirconia and alumina composite ceramic, By using one of the composite silicon nitride ceramics, the composite zirconia ceramics, and the composite alumina ceramics, different ceramic materials can be used for the acetabular cup and the acetabular joint.

The stem fitted to the anti-separation ring and the acetabolite in the same manner as described above may also use a material selected from any one of Examples 1 to 4.

In the case of different materials as described above, it is possible to selectively determine the bone state of the patient in consideration of the economic burden of the operating expenses.

At this time, the acetabular cup 10 and the acetabular 11 may be formed of a composite ceramic to prevent wear pieces from occurring and to have self-lubricating property.

The artificial joint of the present invention is to provide an artificial joint that can be used forever by surgery. It can also be applied to knee joints, ankles, cuffs and shoulders.

The present invention is made of a ceramic consists of a complete spherical molding during molding, the acetabular wear does not occur in the piece wear, as in the case of plastic does not cause fragmentation due to abrasion is not eaten by the macrophage cells, the cell is not affected by the characteristics of the ceramic Far infrared radiation is emitted by the activation of the cells, the biological rhythm is active.

In the present invention, the ceramic used as the material of the artificial joint is known to have a function of activating a biological rhythm and maintaining freshness for a long time as far infrared rays are radiated as it is well known. It is expected to be harmonious with the cells of the human body without any side effects than ever before.

As described above, the ceramic artificial joint of the present invention does not cause uneven wear and does not cause dislocation, and does not dissolve bone by macrophages, and eliminates unnaturalness due to weight reduction of artificial joint, and far infrared rays from ceramic The radiation is to promote the activation of the cell to facilitate the fusion between the artificial hip joint and the cell is to have an effect that can provide a artificial joint that can be used semi-permanently without side effects.

Claims (7)

In artificial joints made of stainless steel, cobalt chrome, titanium alloy, special plastic, etc., Selecting and mixing a ceramic material and a material suitable for an acetabular cup and an acetabular cup; Mixing 0.3 to 0.7% by weight of bind methyl cellulose race to 100% by weight of the prepared composite cera membrane powder to spheroidize in a chamber at 80 ° C. by a spray method; Molding the spherical ceramic powder into the shape of acetabular cup, release preventing ring, and acetabular ball stem at a press pressure of 1ton / cm 2 to 2ton / cm 2; A sintering process after the press molding process, which is fired in a sintering furnace at a temperature of 800 to 1200 ° C. for 2 to 4 hours and at 1500 to 1700 ° C. for 4 to 6 hours, and then gradually cooled; Polishing the sintered acetabular outer surface and the acetabular cup inner surface with a polishing machine; A method of manufacturing artificial joints using ceramics, characterized in that for producing a cup, a cup, a cupping prevention ring in the process of forming a fixed groove so that the stem is fitted to the ball polished to the full spherical in the polishing process. The method of claim 1, The acetabular cup and the acetabular cup are made of zirconia (ZrO ₂ ) 20 ± 0.5% by weight, alumina (Al ₂ 0 ₃ ) 80 ± 0.5% by weight, made of zirconia and alumina composite ceramic, artificial joints using a ceramic Way. The method of claim 1, The acetabular cup and the acetabular cup are made of a composite silicon nitride ceramic powder by mixing 95% silicon nitride (Si ₃ N ₄ ) and 5% yttrium (Y ₂ O ₃ ). . The method of claim 1, The acetabular cup and the acetabular cup are manufactured from a composite zirconia ceramic powder made of zirconia (ZrO ₂ ) 92.66 to 96.4%, and iturium (Y ₂ O ₃ ) 4.95 to 5.35%. The method of claim 1, The acetabular cup and the acetabular cup are made of silicon nitride ceramic powder comprising 90% alumina (Al ₂ O ₃ ) and 5% yttrium (Y ₂ O ₃ ). The acetabular 11 is embedded inside the acetabular cup 10 formed of a composite ceramic to rotate, On one side of the acetab 11 is formed a fixing groove 12 whose inner wall is an inclined surface, The stem 16 is inserted into and fixed to the fixing groove 12, and the artificial joint is formed to prevent the acetabular dislocation from being fixed by the release preventing ring 13 fixed to the inlet insertion groove 10 ′ of the acetabular cup 10. Artificial joint structure, characterized in that. The method of claim 6, The release preventing ring 13 is made of a plastic material, a plurality of grooves 14 are formed on the inner surface, and the groove 14 is fitted with a friction fixing protrusion 15 made of a composite ceramic so as to be in contact with the outer surface of the acetabular. Artificial joint structure, characterized in that the joint is formed.