WO2021215441A1 - 人工関節用シェルおよびその製造方法 - Google Patents
人工関節用シェルおよびその製造方法 Download PDFInfo
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- WO2021215441A1 WO2021215441A1 PCT/JP2021/016059 JP2021016059W WO2021215441A1 WO 2021215441 A1 WO2021215441 A1 WO 2021215441A1 JP 2021016059 W JP2021016059 W JP 2021016059W WO 2021215441 A1 WO2021215441 A1 WO 2021215441A1
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- protective material
- artificial joint
- shell
- substrate
- Prior art date
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- 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
- A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
- A61F2002/3093—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth for promoting ingrowth of bone tissue
-
- 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
- A61F2/3094—Designing or manufacturing processes
- A61F2002/30971—Laminates, i.e. layered products
-
- 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
- A61F2/3094—Designing or manufacturing processes
- A61F2002/30985—Designing or manufacturing processes using three dimensional printing [3DP]
-
- 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
- A61F2/34—Acetabular cups
- A61F2002/3401—Acetabular cups with radial apertures, e.g. radial bores for receiving fixation screws
- A61F2002/3408—Shells having at least two sets of different apertures, e.g. one set located in the equatorial zone and another set located in the polar zone
-
- 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
- A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
- A61F2/4603—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof
- A61F2002/4629—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor for insertion or extraction of endoprosthetic joints or of accessories thereof connected to the endoprosthesis or implant via a threaded connection
-
- 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
- A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
- A61F2310/00389—The prosthesis being coated or covered with a particular material
- A61F2310/00592—Coating or prosthesis-covering structure made of ceramics or of ceramic-like compounds
- A61F2310/00796—Coating or prosthesis-covering structure made of a phosphorus-containing compound, e.g. hydroxy(l)apatite
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L2300/00—Biologically active materials used in bandages, wound dressings, absorbent pads or medical devices
- A61L2300/40—Biologically active materials used in bandages, wound dressings, absorbent pads or medical devices characterised by a specific therapeutic activity or mode of action
- A61L2300/404—Biocides, antimicrobial agents, antiseptic agents
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L2430/00—Materials or treatment for tissue regeneration
- A61L2430/24—Materials or treatment for tissue regeneration for joint reconstruction
Definitions
- This disclosure relates to a shell for artificial joints and a method for manufacturing the same.
- bioimplants for the treatment of both bone injuries and diseases is constantly expanding with the growth of the active and aged population.
- coated bioimplants are known from the viewpoints of antibacterial property and adhesion to bone.
- Patent Document 1 describes a coating for a medical implant, which partially contains an bone binder and also contains an antibacterial metal agent containing silver.
- the artificial joint shell according to the present disclosure includes a cup-shaped substrate having an outer surface including a first region and a second region adjacent to the first region, and the first region and the first region of the outer surface of the base. It comprises a coating containing a calcium phosphate-based material and an antibacterial material arranged so as to straddle the two regions.
- the surface of the coating film in the first region has a larger surface roughness than the surface of the coating film in the second region.
- the method for manufacturing a shell for an artificial joint includes a step of preparing a cup-shaped substrate and a method of exposing a part of the outer surface of the substrate and protecting the other part of the outer surface.
- FIG. 2 is a perspective view of the artificial joint shell 130.
- the artificial joint shell 130 has a hemispherical shape such as one in which a spherical member is divided in half, and a coating 20 is arranged on the outer surface of the hemispherical base 10. Is what you are doing.
- the coating 20 contains a calcium phosphate-based material and an antibacterial material.
- the calcium phosphate-based material has the effect of improving the adhesiveness to bone.
- the antibacterial material has the effect of reducing the adhesion and growth of bacteria.
- the substrate 10 is a member on which the liner 120, which will be described later, is arranged. It has a cup shape with a recess including an opening 12 that opens in one direction of the substrate 10. As a result, the liner 120 is placed in the substrate 10 via the opening 12.
- the substrate 10 according to the present embodiment includes a layered member 30 between the outer surface and the coating film 20. Further, the substrate 10 has a screw hole 31 and a counterbore hole 32. In the present invention, the substrate 10 does not have to have the layered member 30, the screw hole 31, and the counterbore hole 32.
- the surface of the artificial joint shell 130 corresponding to the cross section when the sphere is divided so as to include the center of the sphere is defined as the XY plane, and the hemisphere is perpendicular to the XY plane.
- the direction toward the apex is the Z direction. Further, the Z direction is referred to as the upper side of the artificial joint shell 130.
- FIG. 1 is a schematic view showing a state in which the artificial joint shell 130 is viewed from above.
- the artificial joint shell 130 has a hemispherical shape as described above.
- the base 10 has a hemispherical shape, and the outer surfaces of the base 10 are the first surface 301 (lower surface, see FIG. 2) facing downward (the negative direction of the Z axis) of the base 10. It has a second surface 302 (outer peripheral surface, see FIG. 2) that is different from the first surface 301.
- the first surface 301 is a surface that defines the opening 12, and the second surface 302 is a surface that contacts the pelvis during surgery.
- the first surface 301 is a flat surface and the second surface 302 is a convex curved surface.
- the cup shape of the substrate 10 may be a hemispherical shape formed by dividing the above-mentioned spherical member in half, a sphere-missing shape obtained by cutting out a region smaller than half from the sphere, or a sphere-missing shape from the sphere. It may be the other one cut out. Further, for example, a semi-elliptical shape formed by dividing the ellipsoid so as to include the center of the ellipsoid, an ellipsoidal shape obtained by cutting out a region smaller than half from the ellipsoidal body, or another one obtained by cutting out an ellipsoidal shape from the ellipsoidal body. It may be.
- the convex curved surface of the second surface 302 may be convex when the second surface 302 is captured over the entire area, and may be locally concave. Further, the convex curved surface of the second surface 302 may be a curved surface when viewed over the entire area, and there may be a place where the convex curved surface is locally flat.
- the inner surface of the concave portion of the substrate 10 has a concave curved surface. It suffices if this inner surface is concave when the entire surface is captured, and there may be a locally convex location. Further, the concave curved surface on the inner surface may be a curved surface when the entire surface is captured, and there may be a place where the concave curved surface is locally flat.
- the opening 12 when the substrate 10 is viewed from the side may be a straight line as shown in FIG. 3, but may have a curved shape that is convex upward or a curved shape that is convex downward. It may be wavy with a portion that is convex upward and / or a portion that is convex downward two or more times.
- the outer surface of the substrate 10 according to the present embodiment includes the first region 1 and the second region 2, and includes the third region 3.
- the substrate 10 according to the present invention does not have to include the third region 3.
- the substrate 10 according to the present embodiment is provided with the screw hole 31 and the counterbore hole 32 described above.
- the substrate 10 may further include a fourth region 4 and a fifth region 5.
- the fourth region 4 and the fifth region 5 may be omitted.
- the first region 1 is an region of the outer surface of the substrate 10 that is arranged at least in a part of the region excluding the end of the second surface 302.
- the first region 1 covers the end of the second surface 302, the screw hole 31, and the counterbore hole 32 on the outer surface of the base 10. It is an area allocated to at least a part of the area to be excluded.
- the second region 2 is a region adjacent to the first region 1 and arranged between the first region 1 and the opening 12 of the substrate 10.
- the third region 3 is a region adjacent to the second region 2 and arranged between the second region 2 and the opening 12.
- the fourth region 4 is an region adjacent to the first region 1 and arranged between the first region 1 and the screw hole 31 or the counterbore hole 32.
- the fifth region 5 is a region adjacent to the fourth region 4 and arranged between the fourth region 4 and the screw hole 31.
- the coating film 20 is arranged so as to straddle the first region 1 and the second region 2 on the outer surface of the substrate 10, and the surface of the coating film in the first region 1 is from the surface of the coating film in the second region 2. Also has a large surface roughness.
- the coating film 20 located in the second region 2 may have an end portion 21 and a base portion 22 located closer to the first region 1 side than the end portion 21, and the thickness of the base portion 22 is the end portion 21. It may be larger than the thickness of.
- the third region 3 when the third region 3 is arranged on the substrate 10, the outer surface of the substrate 10 located in the third region 3 is exposed from the coating film 20.
- the surface of the coating film 20 in the second region 2 has a larger surface roughness than the outer surface in the third region 3.
- the outer surface located in the fourth region 4 has a smaller surface roughness than the surface of the coating film in the first region 1.
- the outer surface of the fourth region 4 is provided with a coating film 20 at least in part.
- FIG. 3 is a diagram showing a cross section of the artificial joint shell 130 when cut at AA'in
- FIG. 4 to 7 are schematic views showing an enlarged state of the region X of FIG.
- the first region 1 and the second region 2 are sequentially located on the base 10, and when the base 10 has the third region 3, as shown in FIG. 4, the first region 1 and the second region 2 are located. , The third region 3 is located in order. It can be understood that the first region 1 and the second region 2, or the first region 1, the second region 2 and the third region 3 are sequentially located in the direction parallel to the surface of the substrate 10.
- the second region 2 corresponds to the end portion of the base 10 on the opening 12 side
- the third region 2 is provided.
- the region 3 corresponds to the end portion of the substrate 10 on the opening 12 side.
- the substrate 10 may consist of one component.
- the first region 1, the second region 2 and the third region 3 can be distinguished by design, for example, by the presence or absence of a coating film or the presence or absence of a rough surface described later.
- the coating film 20 is located so as to straddle the first region 1 and the second region 2.
- the third region 3 is exposed from the coating film 20.
- the surface of the coating film 20 located in the first region 1 has a larger surface roughness than the surface of the substrate 10 in the third region 3.
- the surface roughness (Sa) of the coating film 20 located in the first region 1 may be set to, for example, 10 to 80 ⁇ m, 20 to 80 ⁇ m, or 30 to 70 ⁇ m. good. Further, the surface roughness (Sa) of the substrate 10 in the third region 3 may be set to, for example, less than 1.0 ⁇ m.
- the surface roughness Sa of the first region 1 can be obtained from the measurement result of the entire first region 1.
- the surface roughness Sa of the second region 2 can be obtained from the measurement result of the entire second region 2
- the surface roughness Sa of the third region 3 can be obtained from the measurement result of the entire third region 3.
- the surface roughness may be locally smaller than the surface roughness of the substrate 10 in the second region 2 in the first region 1, and the surface roughness may be locally in the second region 2.
- the surface roughness of the coating film 20 or the surface roughness of the substrate 10 may be measured in, for example, a stylus type or an optical type. Further, the surface roughness may be measured according to, for example, "ISO 25178". The measurement of surface roughness is not limited to the above method.
- the shell for artificial joints there was room for improvement in the shell for artificial joints from the viewpoint of achieving both antibacterial properties and control of sticking to bone. That is, for example, when the surface of the shell for artificial joint has a region having a large surface roughness, the end portion of the region having a large surface roughness may stimulate bone or soft tissue and may become a starting point of bacterial infection.
- the surface roughness of the coating film 20 in the first region 1 is larger than that in the second region 2. Therefore, the adhesiveness with the bone can be sufficiently ensured. Further, it has a coating film 20 that straddles the first region 1 and the second region 2. Therefore, the end portion of the first region can be covered with the coating film 20 having antibacterial properties, and according to the artificial joint shell 130, it is possible to achieve both adhesion to the bone and control of antibacterial properties.
- Metal, ceramics or plastic can be used for the substrate 10.
- the metal include stainless alloys, cobalt-chromium alloys, titanium and titanium alloys.
- the titanium alloy an alloy in which at least one of aluminum, tin, zirconium, molybdenum, nickel, palladium, tantalum, niobium, vanadium, platinum and the like is added to titanium can be used.
- ceramics include alumina, zirconia, and alumina-zirconia composite ceramics.
- the plastic include polyethylene, fluororesin, epoxy resin, polyetheretherketone (PEEK) resin, and bakelite.
- the substrate 10 is made of a titanium alloy.
- At least a part of the first region 1 is covered with the coating film 20. That is, the entire surface of the first region 1 may be covered with the coating film 20, or only a part of the first region 1 may be covered with the coating film 20. Further, the surface of the coating film 20 located in the first region 1 has a larger surface roughness than the surface of the coating film 20 in the second region 2. By providing the region having a large surface roughness in this way, the adhesiveness with the bone can be improved. For example, by forming a rough surface in the first region 1 and covering the rough surface with the coating film 20, the surface roughness of the coating film 20 located in the first region 1 can be increased.
- the surface roughness of the rough surface formed in the first region 1 is set to be larger than the surface roughness of the second region 2. Therefore, the surface roughness of the coating film 20 located in the first region 1 can be made larger than the surface roughness of the coating film 20 located in the second region 2.
- the surface roughness of the rough surface formed in the first region 1 may be set to, for example, 10 to 80 ⁇ m, 20 to 80 ⁇ m, or 30 to 70 ⁇ m.
- the surface roughness of the rough surface can be measured, for example, by cutting the artificial joint shell 130 and observing the cut surface with an SEM or the like.
- the artificial joint shell 130 according to the present invention is not limited to the case where the surface roughness of the first region 1 is larger than the surface roughness of the second region 2.
- the artificial joint shell 130 may further include a layered member 30.
- the layered member 30 may be arranged on the first region 1. As a result, as shown in FIG. 4, the first region 1 is higher than the region where the layered member 30 is not provided (for example, the second region 2). Therefore, when the artificial joint shell 130 is embedded in the bone, the first region 1 can be mainly brought into contact with the bone.
- the "layered member” means a member different from the coating film 20 laminated on the substrate 10.
- the surface of the layered member 30 may be a rough surface.
- the region that mainly contacts the bone can be made a rough surface.
- the layered member 30 may be formed by a thermal spraying method as described later. Alternatively, the layered member 30 may be formed as a porous structure.
- the surface roughness of the layered member 3 is set to be larger than the surface roughness of the second region 2.
- the height of the layered member 30 may be set to 300 ⁇ m or more, for example, as long as the lower limit is set to 100 ⁇ m or more. Further, the upper limit may be set to, for example, 1000 ⁇ m or less, and may be set to 700 ⁇ m or less. Further, the surface roughness of the layered member 30 may be set to, for example, 10 to 80 ⁇ m, 20 to 80 ⁇ m, or 30 to 70 ⁇ m.
- the substrate 10 may have a shape that allows the first region 1 to be mainly brought into contact with the bone without providing the layered member 30.
- the first region 1 may have a raised shape with respect to the second region 2 and the third region 3.
- the material exemplified as the material of the substrate 10 can be used.
- the layered member 30 may be made of metal.
- the material of the layered member 30 and the material of the substrate 10 may be the same material, but may be different. Thereby, sufficient strength can be secured.
- the layered member 30 is made of the same material as the substrate 10.
- the layered member 30 is made of a titanium alloy.
- the layered member 30 may have an edge having a lower height than the inside of the layered member 30.
- the "inside of the layered member” means the inside of the layered member 30 in the plane direction.
- FIG. 5 shows a layered member 30 having an edge that is lower in height than the interior. Thereby, the concentration of stress on the edge of the layered member 30 can be reduced.
- the coating film 20 contains a calcium phosphate-based material and an antibacterial material.
- the calcium phosphate-based material is, for example, one or a mixture of two or more selected from the group consisting of hydroxyapatite, ⁇ -3 calcium phosphate, ⁇ -3 calcium phosphate, tetracalcium phosphate, 8 calcium phosphate, and calcium phosphate glass.
- As the antibacterial material a natural antibacterial agent, an organic antibacterial agent, and an inorganic antibacterial agent can be used. Hinokitiol can be used as the natural antibacterial agent, benzalkonium chloride can be used as the organic antibacterial agent, metal can be used as the inorganic antibacterial agent, and silver, copper, zinc and the like can be used as the metal. ..
- the coating film 20 may contain glass ceramics, or may contain an antibacterial agent such as penicillin or vancomycin, in addition to the calcium phosphate-based material and the antibacterial material.
- the concentration of the antibacterial material in the coating 20 is, for example, 0.05% by weight to 3.00% by weight, 0.05% by weight to 2.50% by weight, 0.05% by weight to 1.00% by weight, or 0. .1% by weight to 1.00% by weight may be used.
- concentration of the antibacterial material is 0.05% by weight or more, sufficient antibacterial properties can be obtained. Further, when the concentration of the antibacterial material is 3.00% by weight or less, the burden on the living tissue can be reduced.
- the coating film 20 may be arranged on the layered member 30. As mentioned above, the layered member 30 may come into contact with the bone primarily. The presence of the coating 20 on the layered member 30 can further improve the adhesiveness to the bone and the antibacterial property.
- the height of the layered member 30 may be larger than the thickness of the coating film 20. As a result, the region where the layered member 30 is formed becomes higher than the region where only the coating film 20 is formed, so that the region where the layered member 30 is formed can be mainly brought into contact with the bone.
- the thickness of the coating film 20 may be set to, for example, less than 100 ⁇ m, and may be set to less than 50 ⁇ m. Further, the thickness of the coating film 20 may be set to, for example, 5 ⁇ m or more.
- At least a part of the second region 2 is covered with the coating film 20. That is, the entire surface of the second region 2 may be covered with the coating film 20, or only a part of the second region 2 may be covered with the coating film 20.
- the term "coating 20 straddles the first and second regions" means that at least a part of the boundary between the first region 1 and the second region 2 is covered by the coating 20. .. That is, the boundary between the first region 1 and the second region 2 may be entirely covered with the coating film 20, or only a part thereof may be covered with the coating film 20.
- the coating film 20 may extend from the first region 1 to the second region 2 so as to cover the edge of the layered member 30. That is, the edge of the layered member 30 can be prevented from being exposed from the coating film 20. This can further reduce the growth of bacteria.
- the coating film 20 located in the second region 2 may have an end portion 21 and a base portion 22 located on the first region 1 side of the end portion 21.
- the "edge of the coating film located in the second region” refers to a region of the coating film 20 located in the second region 2 located on the side close to the boundary between the second region 2 and the third region 3. means.
- the “base portion of the coating film located in the second region” means a region of the coating film 20 located in the second region 2 located on the side close to the boundary between the first region 1 and the second region 2.
- the thickness of the base portion 22 may be larger than the thickness of the end portion 21.
- FIG. 6 shows a coating film 20 in which the thickness of the base 22 is larger than the thickness of the end 21.
- the concentration of stress near the boundary between the first region 1 and the second region 2 can be reduced, and as a result, the peeling of the coating film 20 can be reduced.
- the layered member 30 is arranged in the first region 1, it is possible to reduce the concentration of stress near the edge of the layered member 30.
- the third region 3 is exposed from the coating film 20.
- the portion where the coating film 20 is arranged and the portion exposed from the coating film 20 can be distinguished by elemental analysis of the surface of each region.
- the method of elemental analysis can be carried out, for example, by mapping surface elements with an energy dispersive X-ray analysis (EDX) device, which is an accessory device of a general scanning electron microscope (SEM). Further, surface analysis methods such as X-ray photoelectron spectroscopy, Auger electron spectroscopy, and secondary ion mass spectrometry may be used. Further, the element may be confirmed by chemically analyzing the sample obtained by mechanically scraping off the surface of each region.
- EDX energy dispersive X-ray analysis
- SEM general scanning electron microscope
- phosphorus, calcium, antibacterial components and the like are detected on the surface of at least a part of the first region 1 and at least a part of the second region 2 on which the coating film 20 is arranged.
- elements constituting the substrate 10 are detected, phosphorus, calcium, antibacterial components and the like are not detected, or the noise level is lower than the noise level.
- the surface of the coating film 20 located in the second region 2 may have a smaller surface roughness than the surface of the coating film 20 located in the first region 1.
- FIG. 7 shows an aspect in which the surface roughness of the coating film 20 located in the second region 2 is smaller than the surface roughness of the coating film 20 located in the first region 1.
- the surface roughness (Sa) of the coating film 20 located in the first region 1 may be set to, for example, 10 to 80 ⁇ m, 20 to 80 ⁇ m, or 30 to 70 ⁇ m. You may.
- the surface roughness (Sa) of the coating film 20 located in the second region 2 may be set to, for example, 0.1 to 10 ⁇ m.
- the surface of the coating film 20 located in the second region 2 may have a larger surface roughness than the outer surface of the substrate 10 in the third region 3.
- FIG. 7 is also a diagram showing an aspect in which the surface roughness of the coating film 20 located in the second region 2 is larger than the surface roughness of the substrate 10 in the third region 3.
- the surface roughness (Sa) of the substrate 10 in the third region 3 may be set to, for example, less than 1 ⁇ m.
- the surface roughness of the outer surface of the substrate 10 in the second region 2 may be larger than the surface roughness of the outer surface of the substrate 10 in the third region 3.
- the surface roughness (Sa) of the substrate 10 in the second region 2 may be set to 0.1 ⁇ m or more and less than 10 ⁇ m, and may be set to less than 2.0 ⁇ m.
- the surface roughness of the rough surface of the substrate 10 (including the rough surface of the layered member 30) in the first region 1 is set to be larger than the surface roughness of the substrate 10 in the third region 3. ..
- FIG. 8 is a diagram showing a cross section of the artificial joint shell 130 when cut at BB'in FIG.
- FIG. 9 is a schematic view showing an enlarged state of the Y region of FIG.
- the width of the penetrating portion 321 (second penetrating portion) on the outer surface side is smaller than the width of the penetrating portion 322 (first penetrating portion) on the opening 12 side. That is, the counterbore hole 32 has a penetrating portion 322, a penetrating portion 322, and a penetrating portion 321 connected to the outer surface and having a width smaller than that of the penetrating portion 322.
- the substrate 10 may have at least one through hole (screw hole 31, counterbore hole 32) that penetrates the outer surface and the inner surface (opening 12 side) of the substrate 10. At least one of the through holes (screw hole 31) is arranged at a position away from the opening 12 as compared with another position (counterbore hole 32). It can be said that the counterbore hole 32, which is another through hole, has a through portion 322, a through portion 322 connected to the through portion 322 and the outer surface, and a through portion 321 having a width narrower than that of the through portion 322.
- the artificial joint shell 130 may have one or more fins.
- the screw holes 31 are used, for example, to connect the instrument to the artificial joint shell 130 during surgery. For example, as shown in FIG. 11, by fixing the tip of the holder 310 to the screw hole 31 of the artificial joint shell 130, the artificial joint shell 130 is held by the holder 310, and the artificial joint shell 130 is held. Can be moved to the desired position.
- the counterbore hole 32 can be used, for example, to fix the artificial joint shell 130 to the hip bone 93 with the screw screw 320, as shown in FIG.
- the artificial joint shell 130 according to the present disclosure can further improve bone conductivity and bone fixation by having a rough surface portion. Further, since the coating film is coated so that the end portion of the rough surface portion is not exposed, it is possible to prevent bacteria from growing from the end portion of the rough surface portion.
- cup-shaped edge which is easily stressed, is not roughened, physical irritation to soft tissues can be reduced.
- the lower edge of the shell can reduce irritation at the edge.
- the layered member is made of metal, sufficient strength can be secured, and since there is a coating on the layered member, the adhesion to the bone and the antibacterial property are further enhanced.
- the coating film is provided on the outer surface of the substrate 10 in the second region having a surface roughness larger than the outer surface of the substrate 10 in the third region 3, the adhesion between the coating film and the base material is improved, and the coating film is formed. It becomes difficult to peel off from the base material.
- It can be fixed to a jig or acetabulum at a desired position.
- the first region 1, the fourth region 4, and the screw holes 31 or the counterbore holes 32 are located in this order on the base 10.
- the base 10 has the fifth region 5, the first region 1, the fourth region 4, the fifth region 5, and the screw hole 31 are sequentially located on the base 10.
- the first region 1, the fourth region 4, the screw hole 31 or the counterbore hole 32, or the first region 1, the fourth region 4, the fifth region 5, and the screw hole 31 are oriented in a direction parallel to the surface of the substrate 10. , Can be understood as being located in order. Therefore, when the substrate 10 does not have the fifth region 5, the fourth region 4 corresponds to the end portion of the substrate 10 on the screw hole 31 side and the counterbore hole 32 side.
- the fifth region 5 corresponds to the end of the base 10 on the screw hole 31 side
- the fourth region 4 corresponds to the end of the base 10 on the counterbore hole 32 side. It will be equivalent.
- the entire surface of the fourth region may be covered with the coating film 20, or only a part of the fourth region may be covered with the coating film 20.
- the boundary between the first region and the fourth region may not be covered with the coating film 20, but may be entirely covered with the coating film 20 or only partially covered with the coating film 20.
- the coating film 20 covers the edge of the layered member 30. It can extend from one region 1 to the fourth region 4. That is, the edge of the layered member 30 can be prevented from being exposed from the coating film 20. This can further reduce the growth of bacteria.
- the fifth region 5 is exposed from the coating film 20.
- the portion where the coating film 20 is arranged and the portion exposed from the coating film 20 can be distinguished by elemental analysis of the surface of each region.
- the method of elemental analysis can be carried out, for example, by mapping surface elements with an energy dispersive X-ray analysis (EDX) device, which is an accessory device of a general scanning electron microscope (SEM). Further, surface analysis methods such as X-ray photoelectron spectroscopy, Auger electron spectroscopy, and secondary ion mass spectrometry may be used. Further, the element may be confirmed by chemically analyzing the sample obtained by mechanically scraping off the surface of each region.
- EDX energy dispersive X-ray analysis
- SEM general scanning electron microscope
- phosphorus, calcium, antibacterial components and the like are detected on the surface of at least a part of the first region 1 and at least a part of the fourth region 4 on which the coating film 20 is arranged.
- elements constituting the substrate 10 are detected, phosphorus, calcium, antibacterial components and the like are not detected, or the noise level is lower than or equal to the noise level.
- the surface of the coating film 20 located in the fourth region 4 may have a smaller surface roughness than the surface of the coating film 20 located in the first region 1. Thereby, in the fourth region 4, the physical irritation to the soft tissue can be reduced.
- the surface roughness (Sa) of the coating film 20 located in the fourth region 4 may be set to, for example, 0.1 to 10 ⁇ m.
- the surface of the coating film 20 located in the fourth region 4 may have a larger surface roughness than the outer surface of the substrate 10 in the fifth region 5.
- the surface roughness (Sa) of the substrate 10 in the fifth region 5 may be set to, for example, less than 1 ⁇ m.
- the surface roughness of the outer surface of the substrate 10 in the fourth region 4 may be larger than the surface roughness of the outer surface of the substrate 10 in the third region 3 or the fifth region 5.
- the surface roughness (Sa) of the substrate 10 in the fourth region 4 may be set to 0.1 ⁇ m or more and less than 10 ⁇ m, and may be set to less than 2.0 ⁇ m.
- the method for manufacturing a shell for an artificial joint includes a step of preparing a cup-shaped substrate and a first step of exposing a part of the outer surface of the base and protecting the other part of the outer surface.
- the coating film 20 is located so as to straddle the first region 1 and the second region 2, and the surface of the coating film 20 located in the first region 1 is the surface of the substrate 10 in the second region 2. It is possible to obtain a shell for artificial joints having a larger surface roughness than that.
- the cup-shaped substrate can be formed by casting, plastic working, sintering, or other molding, for example, when metal is used as the material. After being formed by a molding process, the shape may be further adjusted by a removal process such as cutting, grinding, or electric discharge machining.
- the screw hole 31 or the counterbore hole 32 may be formed in the molding process, or may be formed in the removing process without being formed in the molding process.
- a roughened surface can be formed by at least one of a thermal spraying method, a layered manufacturing method, a chemical etching method, and a blasting method.
- the thermal spraying method, additive manufacturing method or chemical etching method can increase the surface roughness.
- the thermal spraying material and the laminated modeling material the materials exemplified as the material of the substrate 10 can be used.
- the above-mentioned layered structure may be formed by a thermal spraying method or a layered manufacturing method.
- the chemical etching method include alkali treatment.
- the blasting method include sandblasting.
- the rough surface can be formed before the coating film 20 is formed.
- the coating film 20 can be formed by, for example, a thermal spraying method such as flame spraying, high-speed flame spraying, or plasma spraying. It can also be carried out by a physical vapor deposition method such as sputtering, ion plating, ion beam deposition and ion mixing method, or a chemical vapor deposition method. It can also be performed by a wet coating method such as a sol-gel method.
- a thermal spraying method such as flame spraying, high-speed flame spraying, or plasma spraying. It can also be carried out by a physical vapor deposition method such as sputtering, ion plating, ion beam deposition and ion mixing method, or a chemical vapor deposition method. It can also be performed by a wet coating method such as a sol-gel method.
- a protective material may be used to form the rough surface or the coating 20 only in the desired region.
- masking tape or a tsuitate may be used as the protective material.
- a jig covering the substrate 10 may be used as the protective material.
- the material of these protective materials include metals, glass, resins, and composite materials thereof.
- the protective material may or may not be in contact with the substrate 10.
- the thermal spraying material, the coating material, or the like can wrap around from the edge of the protective material and adhere to the area covered with the protective material to some extent.
- the layered member 30 having an edge having a lower height than the inside and / or the coating film 20 in which the thickness of the base portion 22 is larger than the thickness of the end portion 21 can be formed.
- the protective material for example, a masking tape that has adhesiveness and can be attached to the substrate 10 or a jig that covers the substrate 10 described later can be used.
- the rough surface or the coating 20 can be formed in a specific region by moving the position of the abutment every time the rough surface or the coating 20 is formed.
- the rough surface or the coating 20 can be formed in a specific region by changing the area covered by the jig each time the rough surface or the coating 20 is formed.
- the tip of the discharge nozzle may be arranged, for example, in a straight line with the surface of the desired region without separating the abutment.
- the coating material means a material constituting the coating.
- the surface of the first region 1 and the tip of the discharge nozzle may be arranged in a straight line without separating the counters.
- the surface of the region where the discharge nozzle straddles the first region 1 and the second region 2 and the tip of the discharge nozzle may be arranged in a straight line without separating the counters.
- the tip of the discharge nozzle is, for example, in a straight line with the surface of the first region 1 without separating the abutment in consideration of the diffusion of the material. May be placed in.
- the rough surface or the coating 20 may be formed with the substrate 10, the countersunk, and the discharge nozzle fixed, or the rough surface or the coating 20 may be formed while moving at least one of them. good.
- the angle of the discharge nozzle may be fixed, or the rough surface or the coating film 20 may be formed while changing the angle.
- the rough surface or a coating film 20 can be formed only in a desired region without using a protective material.
- the sprayed material or the coating material may be discharged with the discharge nozzle located above the surface of the desired region.
- the sprayed material may be discharged in a state where the discharge nozzle is located above the surface of the first region 1.
- the coating material may be ejected in a state where the ejection nozzle is located above the surface of the region straddling the first region 1 and the second region 2.
- the discharge nozzle is located above the surface of the first region 1 and the region straddling the second region 2 and the surface of the fourth region 4.
- the coating material may be discharged in this state.
- the base 10 may be fixed and the rough surface or the coating 20 may be formed while moving the position and angle of the discharge nozzle, or the rough surface or the coating 20 may be formed while fixing the discharge nozzle and moving the position and angle of the base 10.
- the coating 20 may be formed.
- the discharge nozzle may be moved at a constant speed or may be moved at a different speed. Further, the discharge direction of the thermal spray material or the coating material forms an angle of 90 ° with a vector extending from the tip of the discharge nozzle toward the surface of the substrate 10 or the rough surface which is the shortest distance from the tip of the discharge nozzle. It may be at an angle of less than 90 °.
- a first protective material is arranged so as to protect the second region 2 while exposing the first region 1 to the substrate 10, and the exposed first region 1 is roughened.
- a surface may be formed.
- the substrate 10 is provided with screw holes 31 and / or counterbore holes 32, the first region 1 is exposed and the first region 2, the fourth region 4, and the fifth region 5 are protected.
- a protective material may be placed to form a rough surface in the exposed first region 1.
- the manufacturing method according to the present disclosure may further include a step of removing the first protective material after the first roughening step and before the film forming step.
- a step of scraping the edge of the rough surface, for example, the edge of the layered member 30 may be performed. As a result, it is possible to avoid the concentration of stress at the edge of the layered member 30 and reduce the irritation to the living tissue.
- the first masking tape may be used as the first protective material.
- the manufacturing method according to the present disclosure may further include a step of attaching the first masking tape to the second region 2 while exposing the first region 1 before the first roughening step. good.
- the substrate 10 is provided with screw holes 31 and / or counterbore holes 32, the first masking tape is exposed in the second region 2, the fourth region 4, and the fifth region 5 while exposing the first region 1.
- the step of pasting may be further included.
- a part of the other portion of the outer surface is exposed after the step of removing the first protective material and before the step of forming the coating film.
- the second roughened surface portion to be formed may be further included, and the second roughened surface portion may be formed on the part exposed from the second protective material.
- a step (S106) of removing the second protective material may be included.
- a roughened surface may be formed by at least one of a chemical etching method and a blasting method. Even if the second roughening step is performed so that the surface of the second roughened surface portion formed in the second roughening step has a smaller surface roughness than the surface of the first roughened surface portion in the first region 1. good.
- the rough surface in the first region 1 can also be referred to as the first rough surface portion.
- a second masking tape may be used as the second protective material.
- the manufacturing method according to the present disclosure includes a step of attaching a second masking tape to the third region 3 while exposing the first region 1 and the second region 2 before the second roughening step. It may be further included.
- masking tape is applied to the third region 3 and the fifth region 5 while exposing the first region 1 and the fourth region 4. It may further include a step of pasting.
- the first rough surface portion and a part of the second rough surface portion are exposed after the step of removing the second protective material and before the film forming step.
- the step (S107) of arranging the third protective material so as to protect the other portion of the second rough surface portion and the outer surface may be further included.
- the film can be formed on the first rough surface portion and a part of the second rough surface portion exposed from the third protective material.
- step (S107) of arranging the third protective material so as to protect the outer surface may be further included.
- the film can be formed on the first rough surface portion exposed from the third protective material, a part of the second rough surface portion, and the fourth region 4.
- a third masking tape may be used as the third protective material.
- a third masking tape is applied to the other part of the second region 2 while exposing a part of the first region 1 and the second region 2 before the film forming step.
- the step of pasting may be further included.
- the substrate 10 is provided with screw holes 31 and / or counterbore holes 32, the first region 1, a part of the second region 2, and the other region 2 while exposing the fourth region.
- the step of attaching the masking tape to a part and the fifth region 5 may be further included.
- the manufacturing method according to the present disclosure may include a hole forming step of forming a hole in the substrate in the step of preparing the substrate.
- the first region 1 may or may not be covered with a protective material.
- the first region 1 may be protected, and at least one of the processing by the chemical etching method and the processing by the blast method may be performed only on the second region 2.
- the substrate 10 is provided with the screw holes 31 and / or the counterbore holes 32, at least one of the processing by the chemical etching method and the processing by the blast method is performed on the second region 2 and the fourth region. May be good.
- a second protective material is arranged so as to expose the first region 1, and at least one of the processing by the chemical etching method and the processing by the blast method on the rough surface of the exposed first region 1 and the second region 2. One may be done.
- the substrate 10 When the substrate 10 is provided with screw holes 31 and / or counterbore holes 32, at least the rough surface of the first region 1, the second region 2 and the fourth region are processed by a chemical etching method, and at least by a blast method. Either one may be performed. As a result, excess sprayed material and the like remaining on the rough surface of the first region 1 can be removed, and a rough surface can be formed in the second region 2, and the base body 10 has screw holes 31 and / or counterbore holes 32. If provided, rough surfaces can also be formed in the second and fourth regions.
- the second rough surface portion is also possible to form the second rough surface portion only in a desired region without using a protective material.
- the chemical etching material means a material that is discharged toward the substrate 10 when processing is performed by the chemical etching method.
- the blast material means a material that is discharged toward the substrate 10 when processing is performed by the blast method.
- the chemical etching material or the blast material may be discharged with the discharge nozzle located above the surface of the desired region.
- the chemical etching material or the blast material may be discharged in a state where the discharge nozzle is located above the surface of the second region 2.
- the chemical etching material or the blast material is in a state where the discharge nozzle is located above the surfaces of the first region 1 and the second region 2. May be discharged.
- the base 10 is provided with a screw hole 31 and / or a counterbore hole 32 and a second rough surface portion is formed in the first region 1, the second region 2, and the fourth region 4, the discharge nozzle is used.
- the chemical etching material or the blast material may be discharged in a state of being located above the surfaces of the 1st region 1, the 2nd region 2, and the 4th region 4.
- the base 10 may be fixed and the second rough surface portion may be formed while moving the position and angle of the discharge nozzle, or the second rough surface portion may be formed while fixing the discharge nozzle and moving the position and angle of the base 10. May be formed.
- the discharge nozzle may be moved at a constant speed or may be moved at a different speed.
- the discharge direction of the chemically etched material or the blast material forms an angle of 90 ° with the vector extending from the tip of the discharge nozzle toward the surface of the substrate 10 or the rough surface which is the shortest distance from the tip of the discharge nozzle. It may be formed at an angle of less than 90 °.
- the thermal spraying method may be used in the first roughening step and the film forming step, and the blasting method may be used in the second roughening step.
- the first protective material a material having higher heat resistance than the second protective material can be used.
- a material having higher heat resistance than the third protective material can be used.
- a material having higher heat resistance than the second protective material can be used. In order to satisfy such a relationship, for example, a material that does not melt or pyrolyze for 1 minute under thermal spraying conditions of 8000 ° C.
- a material that does not melt or pyrolyze for 1 minute under thermal spraying conditions of 3000 ° C. is used as a third protective material.
- a material that does not dissolve or thermally decompose at room temperature may be used as the second protective material.
- a glass and resin composite material may be used as the first protective material, a glass and resin composite material as the third protective material, and a resin as the second protective material.
- the shape of the jig is not particularly limited, but may be, for example, a cylindrical shape.
- the cross section of the tubular jig may be polygonal or circular.
- FIG. 13 is a process diagram showing a method for manufacturing a shell for an artificial joint according to an embodiment.
- the first protective material is arranged, and then the first roughening step is performed, and then the first protective material can be removed.
- the second protective material can be removed.
- the third protective material can be arranged, and then the film forming step can be performed.
- the manufacturing method according to the present disclosure may or may not include a cleaning step between each step.
- the manufacturing method according to the present disclosure may include a step of cleaning the substrate 10 or the layered member 30 arranged on the substrate 10 and the first region 1 after the first roughening step. good.
- a step of cleaning the substrate 10 or the layered member 30 arranged on the substrate 10 and the first region 1 may be further included.
- the cleaning method is not particularly limited, but may be, for example, a method of immersing in a liquid such as water or an organic solvent such as alcohol, or showering using the liquid.
- a method of blowing a gas such as air, nitrogen, or argon may be used. Thereby, the excess sprayed material and / or the shavings generated by the second roughening step can be removed.
- the artificial joint shell 130 shown in FIG. 1 has a shape mainly assuming an artificial hip joint shell, but the artificial joint to which the artificial joint shell according to the present disclosure is applied is not limited to the artificial hip joint.
- the artificial joint include an artificial hip joint, an artificial shoulder joint, an artificial elbow joint, and the like.
- the artificial hip joint 1000 may include an artificial joint stem 100, a head 110, and a liner 120 in addition to the artificial joint shell 130.
- the artificial joint stem 100 and the head 110 may be made of the same material as the base 10 of the artificial joint shell 130, or may be made of different materials.
- the artificial joint stem 100 is embedded in the femur 91.
- the head 110 is arranged on the exposed portion of the artificial joint stem 100.
- the artificial joint shell 130 is fixed to the acetabulum 94 of the hip bone 93, and functions as a hip joint by fitting the head 110 into the recess of the artificial joint shell 130 and sliding it. More precisely, it functions as a hip joint by fitting the head 110 into the recess of the liner 120 fitted in the opening 12 of the shell 130 for artificial joint and sliding it.
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Abstract
Description
まず、図1~図4を参照して、一実施形態に係る人工関節用シェル130の構成を説明する。図2は、人工関節用シェル130の斜視図である。図2に示すように、人工関節用シェル130は、例えば、球状の部材を半分に分割した一方のような半球形状を有しており、半球形状の基体10の外表面に被膜20が配されているものである。被膜20は、リン酸カルシウム系材料および抗菌材料を含む。なお、リン酸カルシウム系材料は、骨への固着性を向上させる効果がある。また、抗菌材料は、細菌の付着および増殖を低減させる効果がある。
ネジ穴31は、例えば、手術時に、器具を人工関節用シェル130に接続するために用いるものである。例えば、図11に示すように、保持具310の先端部を人工関節用シェル130のネジ穴31に固定することにより、保持具310により人工関節用シェル130を保持して、人工関節用シェル130を所望の位置に移動させることができる。
この第1領域1、第4領域4、ネジ穴31若しくはザグリ穴32、または、第1領域1、第4領域4、第5領域5、ネジ穴31は、基体10の表面と平行な方向に、順に位置していると理解できる。このため、基体10が第5領域5を有さない場合には、第4領域4が基体10のネジ穴31およびザグリ穴32側の端部に相当することになる。また、基体10が第5領域5を有する場合には、第5領域5が基体10のネジ穴31側の端部に相当し、第4領域4が基体10のザグリ穴32側の端部に相当することになる。
第4領域は、全面が被膜20に覆われていてもよく、一部のみが被膜20に覆われていてもよい。第1領域と第4領域との境界は、被膜20に覆われていなくてもよいが、全てが被膜20に覆われていても、一部のみが被膜20に覆われていてもよい。第1領域と第4領域4との境界が被膜20に覆われている場合、第1領域1に層状部材30が配されている場合に、被膜20は層状部材30の縁を覆うように第1領域1から第4領域4へ延在し得る。すなわち、層状部材30の縁が被膜20から露出しないようにすることができる。これにより、細菌の増殖をさらに低減することができる。
一実施形態に係る人工関節用シェルの製造方法は、カップ形状の基体を準備する工程と、前記基体の外表面の一部を露出し、前記外表面の他の部分を保護するように第1保護材を配置する工程(S101)と、前記第1保護材から露出する部分に、第1粗面部を形成する第1粗面化工程(S102)と、前記第1保護材を除去する工程(S103)と、リン酸カルシウム系材料と抗菌材料とを含む被膜20を、前記第1粗面部および前記外表面の前記他の部分の少なくとも一部に形成する被膜形成工程(S108)とを含む。
図1に示す人工関節用シェル130は、主に人工股関節用シェルを想定した形状であるが、本開示に係る人工関節用シェルが適用される人工関節は人工股関節に限定されない。人工関節としては、例えば人工股関節、人工肩関節および人工肘関節等が挙げられる。
2 第2領域
3 第3領域
4 第4領域
5 第5領域
10 基体
20 被膜
21 被膜の端部
22 被膜の基部
30 層状部材
100 人工関節用ステム
110 骨頭
120 ライナー
130 人工関節用シェル
1000 人工股関節
Claims (33)
- 第1領域および前記第1領域に隣接した第2領域を含む外表面を有するカップ形状の基体と、
前記基体の前記外表面の前記第1領域および前記第2領域に跨ぐように配された、リン酸カルシウム系材料および抗菌材料を含む被膜と、を備え、
前記第1領域における被膜の表面は、前記第2領域における被膜の表面よりも表面粗さが大きい、人工関節用シェル。 - 前記第2領域は、前記第1領域と前記基体の開口部との間に配されている、請求項1に記載の人工関節用シェル。
- 前記基体は、前記第1領域に配された層状部材をさらに備えている、請求項2に記載の人工関節用シェル。
- 前記層状部材は、金属からなる、請求項3に記載の人工関節用シェル。
- 前記第1領域に配された前記被膜は、前記層状部材上に配されている、請求項3または4に記載の人工関節用シェル。
- 前記層状部材は、前記層状部材の内部と比較して、高さの低い縁を有する、請求項3~5のいずれかに記載の人工関節用シェル。
- 前記第2領域に位置した前記被膜は、端部と、前記端部よりも前記第1領域側に位置した基部と、を有し、
前記基部の厚みは、前記端部の厚みよりも大きい、請求項2~6のいずれかに記載の人工関節用シェル。 - 前記基体の前記外表面は、前記第2領域に隣接し、且つ前記第2領域と前記開口部との間に位置した第3領域をさらに有しており、
前記第3領域に位置した前記基体の前記外表面は、前記被膜から露出している、請求項2~6のいずれか1項に記載の人工関節用シェル。 - 前記第2領域における前記被膜の表面は、前記第3領域における前記外表面よりも表面粗さが大きい、請求項8に記載の人工関節用シェル。
- 前記第1領域における前記外表面は、前記第2領域における前記外表面よりも表面粗さが大きい、請求項2~9のいずれかに記載の人工関節用シェル。
- 前記第2領域における前記外表面は、前記第3領域における前記外表面よりも表面粗さが大きい、請求項8または9に記載の人工関節用シェル。
- 前記基体は、前記外表面と前記基体の内表面とを貫通する、少なくとも一つの貫通穴を、有する請求項2~11のいずれかに記載の人工関節用シェル。
- 前記基体の前記外表面は、前記第1領域に隣接し、且つ前記第1領域と前記貫通穴との間に位置した第4領域をさらに有しており、
前記第4領域に位置した前記外表面は、前記第1領域における被膜の表面よりも表面粗さが小さい、請求項12に記載の人工関節用シェル。 - 前記貫通穴のうち、少なくとも一つは、他の位置と比較して前記開口部から離れた位置に配された、且つ、ネジ穴であり、
他の前記貫通穴のうち、少なくとも一つは、第1貫通部と、前記第1貫通部および前記外表面に接続し、且つ前記第1貫通部よりも幅が狭い、第2貫通部を有する、ザグリ穴である、請求項13に記載の人工関節用シェル 。 - 前記第4領域における前記外表面は、少なくとも一部に前記被膜が配されている、請求項14に記載の人工関節用シェル。
- 前記基体の前記外表面は、前記第4領域に隣接し、且つ前記第4領域と前記ネジ穴との間に位置した第5領域をさらに有しており、
前記第5領域における前記外表面は、すべて前記被膜から露出している、請求項14または15のいずれかに記載の人工関節用シェル。 - 前記第4領域は、前記ザグリ穴に隣接している、請求項14に記載の人工関節用シェル。
- カップ形状の基体を準備する工程と、
前記基体の外表面の一部を露出し、前記外表面の他の部分を保護するように第1保護材を配置する工程と、
前記第1保護材から露出する部分に、第1粗面部を形成する第1粗面化工程と、
前記第1保護材を除去する工程と、
リン酸カルシウム系材料と抗菌材料とを含む被膜を、前記第1粗面部および前記外表面の前記他の部分の少なくとも一部に形成する被膜形成工程とを含む、人工関節用シェルの製造方法。 - 前記第1保護材を除去する工程の後で、且つ前記被膜形成工程の前に、
前記外表面の前記他の部分の少なくとも一部に、第2粗面部を形成する第2粗面化工程と、をさらに含む、請求項18に記載の人工関節用シェルの製造方法。 - 前記第1保護材を除去する工程の後で、且つ前記第2粗面化工程の前に、
前記外表面の前記他の部分のうちの一部を露出し、前記外表面の前記他の部分のうちの他部を保護するように、第2保護材を配置する工程を、さらに含み、
前記第2粗面化工程において、前記第2保護材から露出する前記一部に、第2粗面部を形成する、請求項19に記載の人工関節用シェルの製造方法。 - 前記第2粗面化工程の後で、且つ前記被膜形成工程の前に、
前記第2保護材を除去する工程を有する、
請求項20に記載の人工関節用シェルの製造方法。 - 前記第2保護材を除去する工程の後で、且つ前記被膜形成工程の前に、
前記第1粗面部と、前記第2粗面部の一部を露出し、前記第2粗面部の他の部分および前記外表面を保護するように第3保護材を配置する工程を、さらに含み、
前記被膜形成工程において、前記第3保護材から露出する前記第1粗面部および前記第2粗面部の一部に、前記被膜を形成する、請求項21に記載の人工関節用シェルの製造方法。 - 前記第2保護材を配置する工程において、第2保護材を、前記第1粗面部が露出するように配置し、
前記第2粗面化工程において、前記第2保護材から露出する前記第1粗面部を、ブラスト法によって加工する、請求項20~22のいずれかに記載の人工関節用シェルの製造方法。 - 前記第1保護材として、前記第2保護材よりも耐熱性が高いものを用いる、請求項20~23に記載の人工関節用シェルの製造方法。
- 前記第2保護材を除去する工程の後で、且つ前記被膜形成工程の前に、
前記第1粗面部と、前記第2粗面部の一部を露出し、前記第2粗面部の他の部分および前記外表面を保護するように第3保護材を配置する工程を有し、
前記第1保護材として、前記第3保護材よりも耐熱性が高いものを用いる、請求項22~24のいずれかに記載の人工関節用シェルの製造方法。 - 前記第2保護材を除去する工程の後で、且つ前記被膜形成工程の前に、
前記第1粗面部と、前記第2粗面部の一部を露出し、前記第2粗面部の他の部分および前記外表面を保護するように第3保護材を配置する工程を有し、
前記第3保護材として、前記第2保護材よりも耐熱性が高いものを用いる、請求項22~25のいずれかに記載の人工関節用シェルの製造方法。 - 前記第1保護材として、第1マスキングテープを用い、
前記第1保護材を配置する工程において、前記外表面の一部を露出するように、前記外表面の他の部分に前記第1マスキングテープを貼り付ける工程をさらに含む、請求項20~26のいずれかに記載の人工関節用シェルの製造方法。 - 前記第2保護材として、第2マスキングテープを用い、
前記第2保護材を配置する工程において、前記外表面の他の部分のうちの一部を露出するように、前記外表面の前記他の部分のうちの他部に、前記第2マスキングテープを張り付ける工程をさらに含む、請求項20~27のいずれかに記載の人工関節用シェルの製造方法。 - 前記第2保護材を除去する工程の後で、且つ前記被膜形成工程の前に、
前記第1粗面部と、前記第2粗面部の一部を露出し、前記第2粗面部の他の部分および前記外表面を保護するように第3保護材を配置する工程を有し、
前記第3保護材として、第3マスキングテープを用い、
前記第3保護材を配置する工程において、前記第2粗面部の一部を露出するように、前記第2粗面部の他の部分および前記外表面に、前記第3マスキングテープを張り付ける工程をさらに含む、請求項22~28のいずれかに記載の人工関節用シェルの製造方法。 - 前記基体を準備する工程において、前記基体に穴を形成する穴形成工程を含む、請求項20~29のいずれかに記載の人工関節用シェルの製造方法。
- 前記第1保護材を除去する工程の後で、且つ前記被膜形成工程の前に、前記外表面の前記他の部分のうちの一部を露出し、前記外表面の前記他の部分のうちの他部を保護するように、第2保護材を配置する工程と、
前記第2保護材から露出する前記一部に、第2粗面部を形成する第2粗面化工程と、前記第1粗面部と、前記第2粗面部の一部を露出し、前記第2粗面部の他の部分および前記外表面を保護するように第3保護材を配置する工程を有し、
前記第1粗面化工程において、前記穴の縁を前記第1保護材で保護し、前記第2粗面化工程において、前記穴の縁は前記第2保護材から露出させ、
前記被膜形成工程において、前記穴の縁を前記第3保護材から露出させる、請求項30に記載の人工関節用シェルの製造方法。 - 前記第1粗面化工程は、溶射法およびブラスト法の少なくともいずれか一方によって行なう、請求項19~31のいずれかに記載の人工関節用シェルの製造方法。
- 前記第2粗面化工程は、ブラスト法によって加工する、請求項19~32のいずれかに記載の人工関節用シェルの製造方法。
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