WO2022004242A1 - 摺動部材および摺動部材の製造方法 - Google Patents
摺動部材および摺動部材の製造方法 Download PDFInfo
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- WO2022004242A1 WO2022004242A1 PCT/JP2021/020799 JP2021020799W WO2022004242A1 WO 2022004242 A1 WO2022004242 A1 WO 2022004242A1 JP 2021020799 W JP2021020799 W JP 2021020799W WO 2022004242 A1 WO2022004242 A1 WO 2022004242A1
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- sliding member
- alumina
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- head ball
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/32—Joints for the hip
- A61F2/36—Femoral heads ; Femoral endoprostheses
- A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/32—Joints for the hip
- A61F2/36—Femoral heads ; Femoral endoprostheses
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
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- A61F2/3094—Designing or manufacturing processes
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- A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
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- A61L27/105—Ceramics or glasses containing Al2O3
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- A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
- A61L27/14—Macromolecular materials
- A61L27/18—Macromolecular materials obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
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- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/53—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone involving the removal of at least part of the materials of the treated article, e.g. etching, drying of hardened concrete
- C04B41/5338—Etching
- C04B41/5353—Wet etching, e.g. with etchants dissolved in organic solvents
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
- C04B41/91—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics involving the removal of part of the materials of the treated articles, e.g. etching
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
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- A61F2002/30934—Special articulating surfaces
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- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/32—Joints for the hip
- A61F2/36—Femoral heads ; Femoral endoprostheses
- A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
- A61F2002/3611—Heads or epiphyseal parts of femur
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- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
- A61F2310/00005—The prosthesis being constructed from a particular material
- A61F2310/00179—Ceramics or ceramic-like structures
- A61F2310/00185—Ceramics or ceramic-like structures based on metal oxides
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- A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
- A61F2310/00005—The prosthesis being constructed from a particular material
- A61F2310/00179—Ceramics or ceramic-like structures
- A61F2310/00185—Ceramics or ceramic-like structures based on metal oxides
- A61F2310/00239—Ceramics or ceramic-like structures based on metal oxides containing zirconia or zirconium oxide ZrO2
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- A61L2430/00—Materials or treatment for tissue regeneration
- A61L2430/02—Materials or treatment for tissue regeneration for reconstruction of bones; weight-bearing implants
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
- C04B2235/3244—Zirconium oxides, zirconates, hafnium oxides, hafnates, or oxide-forming salts thereof
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
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- C04B2235/74—Physical characteristics
- C04B2235/78—Grain sizes and shapes, product microstructures, e.g. acicular grains, equiaxed grains, platelet-structures
- C04B2235/786—Micrometer sized grains, i.e. from 1 to 100 micron
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
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- C04B2235/963—Surface properties, e.g. surface roughness
Definitions
- the present disclosure relates to a sliding member and a method for manufacturing the sliding member.
- An artificial joint having a pair of joint members constituting a joint and forming a pair of frictional surfaces that slide relatively between the pair of joint members in a state of being in contact with each other via a lubricating liquid is known. .. Further, in a known artificial joint, at least one of the pair of friction surfaces is a groove-shaped or hole-shaped recess whose width gradually narrows from the surface side to the inside of the friction surface. And some have a curved surface portion that smoothly connects the surface forming the recess and the surface forming the surface portion of the friction surface.
- the sliding member according to one aspect of the present disclosure includes a composite ceramic having a sliding surface slidable with respect to the constituent members constituting the artificial joint and containing alumina and at least one oxide other than alumina.
- the sliding surface includes a plurality of recesses having an opening diameter of 2 ⁇ m or less, and a surface roughness Ra of 0.01 ⁇ m or less.
- the method for manufacturing a sliding member includes a polishing step of polishing the surface of a composite ceramic containing alumina and at least one oxide other than alumina, and a polishing step of polishing the polished surface with a strong acid. It comprises an acid treatment step of treating with a solution to form recesses on the surface.
- FIG. 1 is a schematic view of an artificial hip joint 1 as an artificial joint according to an embodiment of the present disclosure.
- the artificial hip joint 1 includes a acetabular cup 10 fixed to the acetabulum of the acetabulum 93, a femoral stem 20 fixed to the proximal end of the femoral bone 91, and an acetabulum. It is composed of a head ball 22 that slides with the cup 10. That is, the acetabular cup 10, the femoral stem 20, and the head ball 22 are constituent members constituting the artificial hip joint 1.
- the artificial joint is not limited to the artificial hip joint 1 according to the present disclosure, and may be, for example, an artificial knee joint, an artificial ankle joint, or an artificial shoulder joint.
- the acetabular cup 10 has a substantially hemispherical acetabular fixation surface 14 and a substantially hemispherically recessed sliding surface 16.
- a head ball 22 as a sliding member is provided on one end side of the femoral stem 20.
- the head ball 22 has a sliding surface 23 when the head ball 22 slides with respect to the acetabular cup 10.
- the sliding surface 23 is slidable with respect to the acetabular cup 10.
- the head ball 22 functions as a hip joint by sliding with respect to the sliding surface 16 recessed in a substantially hemispherical shape of the acetabular cup 10.
- the sliding member in the present disclosure is not limited to the head ball 22 and may be the acetabular cup 10. In this case, the acetabular cup 10 slides against the head ball 22.
- the surface roughness Ra of the sliding surface 23 is 0.01 ⁇ m or less. As a result, the coefficient of friction of the acetabular cup 10 and the head ball 22 when sliding can be reduced.
- the acetabular fixation surface 14 is an outer surface arranged on the side close to the acetabulum 94.
- the sliding surface 16 is also an inner surface or a contact surface that comes into contact with the head ball 22.
- the acetabular cup 10 is made of polyethylene or ultra-high molecular weight polyethylene.
- the head ball 22 contains a composite ceramic containing alumina and at least one oxide other than alumina. As a result, the head ball 22 can be made to have high hardness and high strength.
- the head ball 22 is a composite ceramic containing 65 to 96% by weight of alumina and 4 to 34.4% by weight of zirconia. As a result, the head ball 22 has higher strength and higher toughness than the ceramics containing only alumina without zirconia, and has higher hardness than the ceramics containing only zirconia.
- the head ball 22 may contain SiO 2 in an amount of 0.20% by mass or more, TiO 2 in an amount of 0.22% by mass or more, and MgO in an amount of 0.12% by mass or more. As a result, it is possible to reduce the decrease in the sintering promotion effect due to the increase in the viscosity of the liquid phase formed at the sintering temperature.
- the head ball 22 has a total content ratio of SiO 2 , TiO 2 and MgO of 0.6 to 4.5% by mass. As a result, the effects of high densification and fine grain structure formation can be obtained.
- the artificial joint is the artificial hip joint 1
- the sliding member is the head ball 22 of the artificial hip joint 1. Therefore, the wear resistance can be improved in the application of the head ball 22 of the artificial hip joint 1.
- the wear resistance is evaluated by measuring the weight loss due to the wear of the acetabular cup 10 when the head ball 22 and the acetabular cup 10 are repeatedly slid.
- FIG. 2 is a schematic cross-sectional view of the sliding surface 23 according to the embodiment of the present disclosure.
- the individual polygons shown in FIG. 2 represent individual crystal grains of the composite ceramics that are polycrystalline.
- the crystal grains are alumina crystal grains or zirconia crystal grains, but they are not distinguished in FIG.
- the sliding surface 23 is shown as a flat surface for convenience.
- the sliding surface 23 has a plurality of recesses 24 having an opening diameter L1 of 2 ⁇ m or less.
- the opening diameter L1 indicates the width of a minute opening existing on the sliding surface 23, and does not necessarily indicate the diameter of a circle.
- the aperture diameter L1 is determined, for example, by measuring the width of the opening seen on the sliding surface 23 photographed by a scanning electron microscope (SEM). Further, the image of the sliding surface 23 may be binarized by image processing software, converted into a circle, or the like, and calculated as the diameter when converted into a circle having the same area. Since the sliding surface 23 has a plurality of recesses 24, water existing in the environment to which the artificial hip joint 1 is applied can be captured by the recesses 24. As a result, the sliding between the acetabular cup 10 and the hip bone cup 10 becomes lubricated, so that the wear resistance can be improved.
- SEM scanning electron microscope
- At least a part of the recesses 24 among the plurality of recesses 24 is formed by the lack of some crystal grains of alumina contained in the composite ceramics.
- the recess 24 can be formed on the sliding surface 23 due to the lack of alumina crystal grains containing an additive element other than aluminum and oxygen.
- the shape of the recess 24 is irregular because it is formed by the lack of some crystal grains of alumina, and may have a sharp edge.
- the shape of the recess 24 may be a groove shape or a hole shape in which the width gradually narrows from the surface side to the inside of the sliding surface 23, or a shape in which the width of the recess increases from the opening to a predetermined depth. May be.
- the average crystal grain size of alumina crystals is 2 ⁇ m or less.
- the average crystal grain size of the alumina crystal can increase a plurality of recesses 24 having an opening diameter L1 of 2 ⁇ m or less as compared with those having an opening diameter of 2 ⁇ m or more.
- the average crystal grain size can be obtained by a linear cutting method using, for example, an enlarged image of a cross section of a composite ceramic taken by SEM.
- the individual particle sizes of the alumina crystal grains are in the range of 0.05 to 3 ⁇ m.
- the individual diameters of the recesses formed by the lack of alumina crystal grains are also 0.05 ⁇ m or more.
- the depth L2 to the bottom of the recess 24 is 2 ⁇ m or less.
- the depth L2 to the bottom of the recess 24 means the maximum distance from the opening of the recess 24 on the sliding surface 23 to the bottom of the recess 24.
- the depth L2 can be measured by magnifying and observing a cross section perpendicular to the sliding surface 23 including the recess 24 with an SEM or the like. Further, the sliding surface 23 including the recess 24 may be magnified and observed by using a confocal laser scanning microscope or the like having a high resolution for shape measurement in the depth direction.
- the sliding surface 23 has 10,000 or more recesses 24 per square millimeter. As a result, the sliding surface 23 has more water present in the environment to which the artificial hip joint 1 is applied than a sliding surface having a sliding surface having less than 10,000 recesses 24 per square millimeter. It can be captured in the recess 24.
- the upper limit of the number of recesses 24 per square millimeter is not particularly determined, but if the number of recesses 24 is excessive, the surface roughness Ra is affected. As the surface roughness Ra increases, the wear resistance characteristics deteriorate, so the number of recesses 24 present per square millimeter is set within a range in which the surface roughness Ra does not exceed 0.01 ⁇ m.
- the method for producing the head ball 22 according to the embodiment of the present disclosure includes a polishing step and an acid treatment step.
- the surface (sliding surface 23) of the composite ceramic containing alumina and at least one oxide other than alumina is polished.
- the sliding surface 23 is polished so that the surface roughness Ra of the sliding surface 23 is 0.01 ⁇ m or less.
- zirconia is contained in at least one oxide other than alumina.
- wear resistance is improved by the polishing process and the acid treatment process.
- the surface of the head ball 22 polished in the polishing step is treated with a strong acid solution to form a recess 24 on the surface.
- the surface of the head ball 22 is brought into contact with the hydrochloric acid aqueous solution for 5 to 200 minutes by immersing the head ball 22 polished in the polishing step in the hydrochloric acid aqueous solution.
- the recess 24 is formed so that the depth L2 from the opening to the bottom of the recess 24 is 2 ⁇ m or less. Further, in the acid treatment step, 10,000 or more recesses 24 are formed on the sliding surface 2 per square millimeter.
- the method for manufacturing the head ball 22 according to the embodiment of the present disclosure is simple and cost effective because the head ball 22 can be manufactured only by immersing the head ball 22 in a strong acid solution after the polishing step. Can be lowered.
- the acid treatment step may be referred to as acid immersion or acid cleaning.
- it is more preferable that the surface polished in the polishing step is brought into contact with the hydrochloric acid aqueous solution for 30 to 150 minutes or more.
- the strong acid solution is, but is not limited to, a hydrochloric acid aqueous solution, a sulfuric acid aqueous solution, or a nitric acid aqueous solution. Further, the strong acid solution may be a mixed solution of these aqueous solutions. In this embodiment, the strong acid solution is an aqueous hydrochloric acid solution. Thereby, the strong acid solution can be easily prepared as compared with the case where the strong acid solution is, for example, a mixed solution of a sulfuric acid aqueous solution and a nitric acid aqueous solution.
- the surface roughness Ra of the sliding surface 23 after the polishing step and before the acid treatment step is 0.01 ⁇ m or less, and after the acid treatment step.
- the surface roughness Ra of the sliding surface 23 is also 0.01 ⁇ m or less.
- the method for manufacturing a sliding member according to an embodiment of the present disclosure may include a grinding step before the polishing step.
- a grinding step composite ceramics containing alumina and at least one oxide other than alumina are ground into a predetermined shape (that is, the shape of a head ball).
- the polishing step the composite ceramics ground to a predetermined shape in the grinding step may be polished.
- zirconia-reinforced alumina (manufactured by Kyocera Corporation) conforming to ISO6474-2 was used. Specifically, a material containing 79.3% by weight of alumina and 18.2% by weight of zirconia was used.
- zirconia-reinforced alumina manufactured by Kyocera Medical Corporation conforming to ISO6474-2 was used. Specifically, a material containing 79% by weight of alumina and 19% by weight of zirconia was used.
- zirconia-reinforced alumina conforming to ISO6474-2, which is a commercially available product having the same size as that of Example 1 and Example 2, was used.
- the zirconia-reinforced alumina contains about 75% by weight of alumina and about 25% by weight of zirconia.
- High-purity alumina was used as the material for the head ball of Comparative Example 2.
- the high-purity alumina contains 99.5% by weight or more of alumina.
- a Co—Cr—Mo alloy (based on ASTM F1537) was used as the material for the head ball of Comparative Example 3.
- each head ball 22 was vapor-deposited with platinum, and the surface of the head ball 22 was observed with a scanning electron microscope (SEM). A secondary electron image was acquired at a magnification of 1000 to 30,000 times.
- FIG. 3 is a diagram showing the state of occurrence of recesses when the time for immersing the head ball in the hydrochloric acid aqueous solution of Example 1 is changed.
- the sliding surface 23 of the head ball after 5 minutes of acid immersion was rougher than that before acid immersion, and the result was shown that the recess 24 was formed.
- the sliding surface 23 of the head ball 22 after 30 minutes of acid immersion had more recesses than the sliding surface 23 of the head ball 22 after 5 minutes of acid immersion.
- the sliding surface 23 of the head ball after 150 minutes of acid immersion had more recesses than the sliding surface 23 of the head ball 22 after 30 minutes of acid immersion. This shows that the recess 24 can be formed on the surface of the sliding surface 23 by contacting the surface of the composite ceramic with the aqueous hydrochloric acid solution for 5 minutes or longer.
- FIG. 4 is an enlarged view of a recess on the sliding surface before and after acid immersion (before and after acid cleaning) of the head ball of Example 1.
- FIG. 5 is an enlarged view of a recess on the sliding surface of the head ball after acid immersion (after acid cleaning) of Example 1.
- FIGS. 4 and 5 it was shown that fine irregularities were formed on the surface of the sliding surface when the magnification was increased to 5000 times before the acid immersion. This corresponds to the surface roughness of the sliding surface of the head ball before acid immersion.
- FIG. 4 after the acid immersion, the result that the concave portion was formed on the sliding surface was shown when the magnification was increased to 1000 times.
- the magnification was increased to 5000 times, the result that black spots appeared on the sliding surface was shown. These black spots are formed by the lack of some of the alumina crystals contained in the composite ceramics.
- FIG. 6 is a diagram comparing the surface roughness of the head ball of Example 1 after acid immersion and the sliding surface of Comparative Example 1 without acid immersion. The length of the scale at the lower right of each photograph is 15 ⁇ m. As shown in FIG. 6, the surface of Example 1 had many recesses formed as compared with the surface of Comparative Example 1.
- the average surface roughness of the head ball 22 after acid immersion was 0.0034 in Example 1, 0.0033 in Example 2, and 0.0032 in Comparative Example 1, respectively. That is, the average surface roughness of the head ball 22 after acid immersion was substantially the same in all of Example 1, Example 2, and Comparative Example 1. From this result, it was shown that in this example, the recess formed in the head ball has almost no effect on the surface roughness of the head ball. Further, it has been confirmed that the surface roughness Ra of the surface roughness Ra of the head balls of Comparative Example 2 and Comparative Example 3 is the same, and all of them are 0.01 ⁇ m or less.
- a head ball having an outer diameter of 40 mm was prepared using a zirconia-reinforced alumina material, and a wear simulation test compliant with ISO1424-1 and ISO142422-2 was carried out.
- a gas plasma sterilized crosslinked ultra-high molecular weight polyethylene liner (cup) was used as the sliding partner.
- FIG. 7 is a diagram showing the results of a wear test of a head ball after acid immersion.
- the vertical axis of FIG. 7 is an axis showing the amount of wear of the liner slid with the head ball in mg.
- the horizontal axis of FIG. 7 is an axis indicating the number of times of sliding. For example, a value of 5 on the horizontal axis of FIG. 7 means 5 million cycles.
- the amount of wear of Examples 1 and 2 after 5 million cycles was about 8 mg.
- the wear amounts of Comparative Example 1, Comparative Example 2, and Comparative Example 3 after 5 million cycles were about 12 mg, about 13.5 mg, and about 17.5 mg, respectively.
- the amount of wear of Example 1 and Example 2 in which the recess was formed showed a result that the amount of wear was lower than that of Comparative Example 1, Comparative Example 2, and Comparative Example 3. Therefore, it was shown that the improvement of wear resistance is improved by forming a plurality of recesses.
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Abstract
Description
(人工股関節1の全体構成)
以下、本開示の一実施形態について、詳細に説明する。図1は、本開示の一実施形態に係る人工関節としての人工股関節1の模式図である。図1に示すように、人工股関節1は、寛骨93の寛骨臼に固定される寛骨臼カップ10と、大腿骨91の近位端に固定される大腿骨ステム20と、寛骨臼カップ10と摺動する骨頭ボール22とから構成されている。すなわち、寛骨臼カップ10、大腿骨ステム20、および骨頭ボール22は、人工股関節1を構成する構成部材である。ただし、人工関節は、本開示に係る人工股関節1に限られず、例えば人工膝関節、人工足関節、または人工肩関節でもよい。
本開示の一実施形態に係る骨頭ボール22の製造方法は、研磨工程、および酸処理工程を含んでいる。研磨工程では、アルミナと、アルミナ以外の少なくとも1つの酸化物と、を含む複合セラミックスの表面(摺動面23)を研磨する。研磨工程では、摺動面23の表面粗さRaが0.01μm以下となるように摺動面23を研磨する。本実施形態では、アルミナ以外の少なくとも1つの酸化物にジルコニアを含む。これにより、骨頭ボール22は、ジルコニアを含まない構成と比べて、より高強度、高靭性となる。また、研磨工程と酸処理工程によって耐摩耗性が向上する。
それぞれの骨頭ボール22の表面を白金蒸着し、走査型電子顕微鏡(SEM)にて骨頭ボール22の表面を観察した。1000倍~30000倍の倍率で2次電子像を取得した。
それぞれの骨頭ボールの表面を、オリンパス製共焦点レーザー顕微鏡にて100倍の倍率で観察した。図6は、酸浸漬後における実施例1の骨頭ボールおよび、酸浸漬を行っていない比較例1の摺動面の表面粗さを比較する図である。なお、各写真の右下の縮尺の長さは15μmである。図6に示すように、実施例1の表面には、比較例1の表面と比べて多くの凹部が形成されていた。
JIS B 0601に準拠して、接触式の粗さ測定器(株式会社ミツトヨ製、SV-3100SA)を用いて、基準長さ:0.08mm、区間数:5でそれぞれの骨頭ボールの天頂部にて粗さ曲線を取得した。λc:0.08mm、λs:0.0008mmのガウシアンフィルタでカットオフし、算術平均粗さRaを測定した。
ジルコニア強化アルミナ材を用いて外径40mmの骨頭ボールを作製し、ISO14242-1、ISO14242-2に準拠した摩耗シミュレーション試験を実施した。摺動相手はガスプラズマ滅菌した架橋超高分子量ポリエチレン製ライナー(カップ)を用いた。試験は実施例および比較例毎にサンプル数n=3で実施した。摩耗量は50万サイクル毎にライナーの重量変化を計測し、試験開始からの重量減少とload soakとの差の計測から求めた。摩耗量は、50万サイクル毎に500万サイクルまで計測し、各サイクルにおいてn=3の摩耗量の平均値を算出した。
10 寛骨臼カップ(摺動部材)
16、23 摺動面
22 骨頭ボール(摺動部材)
24 凹部
L1 開口径
L2 凹部の底部までの深さ
Claims (15)
- 人工関節を構成する構成部材に対して摺動可能な摺動面を備え、
アルミナと、アルミナ以外の少なくとも1つの酸化物と、を含む複合セラミックスを含み、
前記摺動面は、開口径が2μm以下である複数の凹部を有しており、表面粗さRaが0.01μm以下である、摺動部材。 - 前記複数の凹部のうち少なくとも一部の前記凹部は、前記複合セラミックスに含まれるアルミナの結晶の一部が欠如することによって形成されたものである、請求項1に記載の摺動部材。
- 前記アルミナの結晶の平均結晶粒径は、2μm以下である、請求項1または2に記載の摺動部材。
- 前記凹部は、開口から底部までの深さが2μm以下である、請求項1から3のいずれか1項に記載の摺動部材。
- 前記摺動面は、前記凹部を1平方ミリメートル当たり10,000個以上有する、請求項1から4のいずれか1項に記載の摺動部材。
- 前記複合セラミックスは、65~96重量%のアルミナ、4~34.4重量%のジルコニアを含む、請求項1から5のいずれか1項に記載の摺動部材。
- 前記人工関節は、人工股関節であり、
前記摺動部材は、前記人工股関節の骨頭ボールである、請求項1から6のいずれか1項に記載の摺動部材。 - 前記構成部材が、ポリエチレンまたは架橋超高分子量ポリエチレンを含む、請求項1から7のいずれか1項に記載の摺動部材。
- アルミナと、アルミナ以外の少なくとも1つの酸化物と、を含む複合セラミックスの表面を研磨する研磨工程と、
研磨された前記表面を強酸溶液で処理して前記表面に凹部を形成する酸処理工程と、を含む摺動部材の製造方法。 - 前記アルミナ以外の少なくとも1つの酸化物は、ジルコニアを含む、請求項9に記載の摺動部材の製造方法。
- 前記研磨工程の後、かつ、前記酸処理工程の前の前記表面の表面粗さRaが0.01μm以下であり、前記酸処理工程の後の前記表面の表面粗さRaも0.01μm以下である、請求項9または10に記載の摺動部材の製造方法。
- 前記酸処理工程により形成された前記凹部は、開口から底部までの深さが2μm以下である、請求項9から11のいずれか1項に記載の摺動部材の製造方法。
- 前記酸処理工程により、人工関節を構成する構成部材に対して摺動可能な摺動面に前記凹部を1平方ミリメートル当たり10,000個以上形成する、請求項9から12のいずれか1項に記載の摺動部材の製造方法。
- 前記強酸溶液は、塩酸水溶液である、請求項9から13のいずれか1項に記載の摺動部材の製造方法。
- 前記酸処理工程において、前記表面を前記塩酸水溶液に5分以上接触させる、請求項14に記載の摺動部材の製造方法。
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AU2021299050A AU2021299050A1 (en) | 2020-07-02 | 2021-06-01 | Sliding member and method for producing sliding member |
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WO2002011780A1 (fr) * | 2000-08-07 | 2002-02-14 | Matsushita Electric Works, Ltd. | Joint artificiel en ceramique composite de zircone-alumine |
JP2005034630A (ja) * | 2003-06-25 | 2005-02-10 | Kobe Steel Ltd | 生体インプラント用セラミックス部材及びその製造方法 |
WO2005042047A1 (ja) * | 2003-10-30 | 2005-05-12 | Kyocera Corporation | 生体部材及びその製造方法 |
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WO2002011780A1 (fr) * | 2000-08-07 | 2002-02-14 | Matsushita Electric Works, Ltd. | Joint artificiel en ceramique composite de zircone-alumine |
JP2005034630A (ja) * | 2003-06-25 | 2005-02-10 | Kobe Steel Ltd | 生体インプラント用セラミックス部材及びその製造方法 |
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