WO2020071497A1 - 骨再生材料 - Google Patents
骨再生材料Info
- Publication number
- WO2020071497A1 WO2020071497A1 PCT/JP2019/039172 JP2019039172W WO2020071497A1 WO 2020071497 A1 WO2020071497 A1 WO 2020071497A1 JP 2019039172 W JP2019039172 W JP 2019039172W WO 2020071497 A1 WO2020071497 A1 WO 2020071497A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- bone regeneration
- regeneration material
- gelatin
- bone
- ocp
- Prior art date
Links
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- 230000010478 bone regeneration Effects 0.000 title claims abstract description 149
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- 239000008273 gelatin Substances 0.000 claims abstract description 81
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- 235000019322 gelatine Nutrition 0.000 claims abstract description 81
- 235000011852 gelatine desserts Nutrition 0.000 claims abstract description 81
- 229910000392 octacalcium phosphate Inorganic materials 0.000 claims abstract description 81
- YIGWVOWKHUSYER-UHFFFAOYSA-F tetracalcium;hydrogen phosphate;diphosphate Chemical compound [Ca+2].[Ca+2].[Ca+2].[Ca+2].OP([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O YIGWVOWKHUSYER-UHFFFAOYSA-F 0.000 claims abstract description 81
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- XYJRXVWERLGGKC-UHFFFAOYSA-D pentacalcium;hydroxide;triphosphate Chemical compound [OH-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O XYJRXVWERLGGKC-UHFFFAOYSA-D 0.000 description 5
- 238000002513 implantation Methods 0.000 description 4
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- VSIIXMUUUJUKCM-UHFFFAOYSA-D pentacalcium;fluoride;triphosphate Chemical compound [F-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O VSIIXMUUUJUKCM-UHFFFAOYSA-D 0.000 description 1
- 229920000747 poly(lactic acid) Polymers 0.000 description 1
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Images
Classifications
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- 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
- A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
- A61L27/40—Composite materials, i.e. containing one material dispersed in a matrix of the same or different material
- A61L27/44—Composite materials, i.e. containing one material dispersed in a matrix of the same or different material having a macromolecular matrix
- A61L27/46—Composite materials, i.e. containing one material dispersed in a matrix of the same or different material having a macromolecular matrix with phosphorus-containing inorganic fillers
-
- 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
- A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
- A61L27/50—Materials characterised by their function or physical properties, e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials
- A61L27/56—Porous materials, e.g. foams or sponges
-
- 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
- A61L2400/00—Materials characterised by their function or physical properties
- A61L2400/12—Nanosized materials, e.g. nanofibres, nanoparticles, nanowires, nanotubes; Nanostructured surfaces
-
- 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
- A61L2430/02—Materials or treatment for tissue regeneration for reconstruction of bones; weight-bearing implants
Definitions
- the present invention relates to a bone regeneration material which is a composite of a calcium phosphate compound and a polymer material, and more particularly to a bone regeneration material using gelatin as a polymer material.
- Bone regeneration material is used as a replacement for lost bone, or as a replacement for the loss of part of bone.
- Various materials are known as materials for the bone regeneration material, and typically, a material using a calcium phosphate-based compound can be mentioned.
- the calcium phosphate compound include hydroxyapatite (HAp or HAP (hydroxyapatite)), ⁇ -tricalcium phosphate ( ⁇ -TCP ( ⁇ -tricalcium phosphate)), and octacalcium phosphate (OCP (octacalcium phosphate)).
- calcium phosphate compounds tend to be brittle and have poor shapeability. Therefore, when it is used as a bone regeneration material, it is generally known that it is molded into a block by sintering, or a composite is formed by using a polymer material together with a calcium phosphate compound. ing.
- a typical example of the polymer material used in combination is collagen.
- a typical example is an expandable porous material disclosed in Patent Document 1.
- the expandable porous body is composed of a composite of compressed apatite and collagen, maintains a shape when compressed when dried, and has a configuration that expands into a porous body before compression by water absorption.
- a collagen bone regeneration material there is a material which has already been approved for the manufacture and sale of medical devices and has been covered by insurance (for example, a brand name "Refit" (registered trademark) or the like).
- Patent Document 2 As another bone regeneration material, the present applicant has proposed a bone regeneration material disclosed in Patent Document 2 or Patent Document 3. These bone regeneration materials differ from the collagen bone regeneration materials described above in that gelatin is used as a polymer material. Note that a bone regeneration material using a calcium phosphate compound and gelatin is referred to as a “gelatin bone regeneration material” for convenience of distinguishing from the above-described collagen bone regeneration material.
- the bone regeneration material (gelatin bone regeneration material) disclosed in Patent Document 2 has a constitution including a thermally dehydrated crosslinked product of a coprecipitate of octacalcium phosphate and gelatin.
- the bone regeneration material includes a complex of octacalcium phosphate fine powder having a particle size of 5 to 1000 nm and gelatin, and has a pore of 10 to 500 ⁇ m. These bone regeneration materials can realize good physical strength or physical shape and shape and elasticity, and can also realize good bone regeneration ability that can be sufficiently replaced with new bone.
- the collagen bone regeneration material disclosed in Patent Literature 1 has elasticity when wet, has good compatibility when implanted in a bone defect, and is easily processed with a scalpel or scissors or the like. .
- this collagen bone regenerated material was brittle and easily collapsed when gripped with tweezers or the like.
- the collagen bone regenerating material collapses, and fine broken pieces (fine powder or “dust”) are likely to be generated.
- the bone regeneration materials (gelatin bone regeneration materials) disclosed in Patent Documents 2 and 3 use gelatin instead of collagen, and as described in these documents, have excellent physical properties and bone properties as bone regeneration materials. It is possible to realize regenerative ability. However, it has been clarified that there is still room for improvement in the handling properties of these regenerated gelatin bone materials.
- the present invention has been made in order to solve such a problem, and provides a gelatin bone regenerating material capable of suppressing collapse at the time of implantation and realizing good handleability.
- the purpose is to do.
- the bone regeneration material according to the present invention is at least composed of a complex of octacalcium phosphate particles and gelatin, and is a porous body having a plurality of pores.
- the particle diameter is 1 ⁇ m or more and less than 1 mm, and the gelatin has a molecular weight in the range of 30 kDa to 70 kDa.
- a bone regeneration material mainly composed of a composite of a calcium phosphate compound and a polymer material
- micrometer-level octacalcium phosphate particles OCP particles
- a complex of OCP and gelatin OCP / Gel
- gelatin having a molecular weight within a predetermined range.
- a porosity which is a volume ratio of the pores contained in the porous body, is in a range of 87% to 98%, and a median value of the pore diameter is 14 ⁇ m to 55 ⁇ m. May be in the range.
- the octacalcium phosphate particles may have a particle diameter in a range of 1 ⁇ m to 200 ⁇ m.
- the content ratio of the octacalcium phosphate particles to the gelatin in the complex is in the range of 1 to 9 in terms of mass ratio of the octacalcium phosphate particles to the gelatin. It may be.
- Example 5 is a graph showing a change in compression force with respect to a compression distance when a compression test is performed on the bone regeneration material samples according to Example 1 and Comparative Example 1 of the present invention.
- 4 is a graph showing the results of the elastic modulus with respect to the number of tests when performing a compression test on the bone regeneration material samples according to Example 1, Comparative Example 1 and Comparative Example 2 of the present invention.
- the bone regeneration material according to the present disclosure is a porous material having at least a complex of octacalcium phosphate particles (OCP particles) and gelatin and having a plurality of pores.
- the particle size of the octacalcium phosphate particles constituting the composite may be 1 ⁇ m or more and less than 1 mm.
- the gelatin constituting the complex may have a molecular weight in the range of 30 kDa to 70 kDa.
- OCP / Gel a composite of OCP particles and gelatin is appropriately described as “OCP / Gel”.
- OCP particles used in the present disclosure may be those having a median diameter (D50) of 1 ⁇ m or more and less than 1 mm, that is, those having a micrometer level.
- D50 median diameter
- a more preferable example is 1 ⁇ m or more and 100 ⁇ m or less, and a further preferable example is a range of 20 ⁇ m to 60 ⁇ m.
- a bone regeneration material in which the OCP particles are well dispersed in gelatin cannot be obtained. That is, in the present disclosure, if the OCP particles are too large or too small, a good OCP / Gel cannot be obtained.
- the method for measuring the particle size of the OCP particles is not particularly limited, but typically, for example, a method using a laser diffraction type particle size distribution analyzer can be mentioned.
- the particle size of the OCP particles is measured by wet measurement using Microtrac MT-3300 EX II manufactured by Microtrac Bell Co., Ltd.
- OCP particles according to the present disclosure are not particularly limited in terms of other physical properties or a method for preparing the OCP particles as long as they have a micrometer level. As long as OCP particles having a particle size of a micrometer level are commercially available, commercially available products can be used.
- various conditions may be set or adjusted based on the method described in Patent Document 3, for example, so that the particle diameter falls within a predetermined range.
- ⁇ ⁇ ⁇ ⁇ Gelatin used in the present disclosure may have a molecular weight (or molecular weight distribution) within a range of 30 kDa to 70 kDa.
- the “molecular weight” here is a weight average molecular weight.
- the gelatin in the present disclosure may be commercially available, or may be prepared by denaturing collagen.
- the method for denaturing collagen is not particularly limited, but typically includes a heat treatment of collagen under known conditions.
- the specific type of collagen as a raw material is not particularly limited.
- collagen derived from pig, cow skin, bone, and tendon can be used.
- a preferred example is an enzyme-solubilized collagen that has been solubilized by a known proteolytic enzyme and from which telopeptide has been removed.
- the type of collagen is not particularly limited, and typical examples include type I, type I + type III.
- the molecular weight (or molecular weight distribution) of gelatin used in the present disclosure may be in the range of 30 kDa to 70 kDa, but a preferable example is in the range of 35 kDa to 65 kDa, and more preferable. One example is in the range of 40 kDa to 60 kDa.
- the molecular weight of gelatin (or the lower limit of the molecular weight distribution) is less than 30 kDa, OCP / Gel in which OCP particles are well dispersed in gelatin cannot be obtained. If the molecular weight of gelatin (or the upper limit of the molecular weight distribution) exceeds 70 kDa, OCP / Gel in which OCP particles are well dispersed in gelatin (that is, a bone regeneration material or its main component) can be obtained, but its shape is stable. The original shape cannot be restored due to compression or the like, or breakage or collapse occurs with compression.
- the method for measuring the molecular weight of gelatin is not particularly limited, but in the present embodiment, for example, “Pagi method ⁇ Gelatin test method for photographic 10th edition (2006 edition)” (Joint Council for Test Method for Gelatin for Photography, 2006) The method described in “20-2. Average molecular weight” of November, is used.
- the “shape stability” in the present disclosure means that at least when the bone-regenerating material containing water (moistened) is compressed (crushed by external force), the bone-regenerating material may break or collapse.
- (Breakage, etc.) means a property in which "destruction” such that the original shape before compression cannot be maintained does not substantially occur.
- the "shape stability” in the present disclosure not only substantially does not cause "breakage” such as breakage, but also has a restoring property in which the original shape is substantially restored when the compression is released. Means nature. When the bone regeneration material according to the present disclosure has such shape stability, it is possible to realize good handling at the time of implantation.
- the bone regeneration material according to the present disclosure is at least composed of a composite (OCP / Gel) composed of OCP particles and gelatin, but has a content ratio (mixing ratio or mixing ratio) of OCP particles and gelatin.
- OCP / Gel a composite
- the mass ratio of OCP particles is less than 1 with respect to gelatin 1, depending on various conditions, the bone regeneration material obtained tends to have poor bone regeneration ability. On the other hand, if the mass ratio of OCP particles exceeds 9 with respect to gelatin 1, the moldability of the obtained bone regenerating material decreases.
- the bone regeneration material according to the present disclosure is at least composed of a composite (OCP / Gel) composed of OCP particles and gelatin, but may contain components other than OCP particles and gelatin.
- components include bioabsorbable polymers other than gelatin, such as polylactic acid and polylactic acid-polyethylene glycol copolymer; calcium phosphate compounds other than OCP, such as ⁇ -tricalcium phosphate ( ⁇ -TCP) Bioabsorbable materials such as hydroxyapatite ceramics; and other materials known in the field of bone regeneration materials.
- the content when these other components are contained is not particularly limited, and may be within a range that does not hinder the physical properties, effects, and the like of the bone regeneration material according to the present disclosure.
- the method for producing a bone regeneration material according to the present disclosure is not particularly limited, but may be a lyophilization method disclosed in Patent Document 3 instead of the coprecipitation method disclosed in Patent Document 2.
- the specific conditions and the like of the freeze-drying method are not particularly limited, and may be the conditions and the like disclosed in Patent Document 3, or may be the conditions and the like disclosed in other known documents, The conditions and the like disclosed in these known documents may be appropriately adjusted or changed.
- the bone regeneration material according to the present disclosure is at least composed of OCP / Gel and has a plurality of pores (or pores). That is, the bone regeneration material according to the present disclosure is a porous body composed of a composite of OCP particles and gelatin, or a porous body mainly composed of a composite of OCP particles and gelatin.
- the specific structure of the pores of the bone regeneration material according to the present disclosure is not particularly limited, but the diameter (pore diameter or pore diameter) may be any value as long as the median value is in the range of 14 ⁇ m to 55 ⁇ m.
- a preferred example of the pore diameter includes a median of 20 ⁇ m to 45 ⁇ m, and a more preferred example of a pore diameter includes a median of 25 ⁇ m to 40 ⁇ m.
- the pore diameter is less than 14 ⁇ m, depending on various conditions, there is a tendency that the penetration of cells into the pores is inhibited after the bone regeneration material is implanted. If the pore diameter exceeds 55 ⁇ m, the strength or shape stability of the bone regenerating material tends to decrease, depending on various conditions.
- the method for measuring the pore diameter is not particularly limited, but typically, for example, a method using a pore distribution measuring device exemplified in Examples described later can be mentioned.
- pores having pore diameters exceeding 100 ⁇ m are referred to as “large pores” for convenience, and all pores (provided that the pore diameter is in the range of 0.01 ⁇ m to 500 ⁇ m).
- the volume ratio of the large pores among the pores is not particularly limited, but typically may be 35% or less.
- a preferred upper limit of the volume ratio of the large pores is, for example, 20% or less, and a more preferred upper limit is, for example, 5% or less. If the volume ratio of the large pores exceeds 35%, there is a possibility that the shape stability of the bone regenerative material is reduced, depending on various conditions.
- the method for calculating the volume ratio of the large pores is not particularly limited.
- the volume of the large pores and the volume of the total pores are determined by a mercury intrusion method using a pore distribution measuring device and conditions exemplified in Examples described later. Is calculated, and the calculated value of the volume of large pores is divided by the calculated value of the volume of all pores.
- the porosity of the bone regeneration material according to the present disclosure may be within the range of 88% to 98%.
- a preferred example of the porosity is, for example, in the range of 90% to 96%. If the porosity is less than 88%, the shape stability of the bone regenerative material tends to decrease, depending on various conditions. Further, depending on various conditions, it generally tends to be difficult to produce a porous body having a porosity of more than 98%.
- the method for measuring the pore diameter and the porosity is not particularly limited, but typically, as described above, a mercury intrusion method using the pore distribution measuring device and conditions exemplified in the examples can be mentioned.
- the method for controlling the pore diameter and the porosity of the bone regeneration material is not particularly limited. For example, various conditions contributing to the formation of pores in the freeze-drying method may be appropriately adjusted or changed.
- the elastic modulus of the bone regeneration material according to the present disclosure is not particularly limited, but may be in the range of 0.01 N / mm 2 to 0.1 N / mm 2 , and the preferable elastic modulus is 0.015 N / Mm 2 to 0.0750 N / mm 2 . If the elastic modulus is less than 0.01 N / mm 2 , the restoration rate of the bone regeneration material may be reduced to a level that is less than practicality, depending on various conditions, and the elastic modulus is 0.1 N / mm 2. When it exceeds, there is a possibility that breakage or collapse may occur due to repeated compression or the like, depending on various conditions.
- the method of measuring the elastic modulus is not particularly limited, but typically, a method using a compression tester exemplified in Examples described later can be mentioned.
- the bone regeneration material is moistened with water.
- the bone regeneration material according to the present disclosure has a good restoration rate even when compressed.
- the specific restoration rate is not particularly limited, but typically, the bone regeneration material before compression is placed on a horizontal plane (reference plane) serving as a reference, and the height of the bone regeneration material from the reference plane is set. Is 100%, the height after compression may be in the range of 90% to 100%.
- a preferred restoration rate after compression is, for example, in the range of 94% to 100%. If the upper limit of the restoration ratio after compression is 97% or more, it can be evaluated that the restoration ratio is better.
- the bone regeneration material When evaluating the restoration rate, the bone regeneration material is compressed while moistened with water. In the evaluation of the restoration rate, it is necessary that the bone regeneration material after compression has not been broken or collapsed. That is, when the bone regeneration material after compression has broken or the like, the bone regeneration material is not subject to the evaluation of the restoration rate.
- the bone regeneration material according to the present disclosure OCP particles are favorably dispersed in gelatin, which is a polymer material. This good dispersion state is referred to as “uniform dispersion” for convenience. That is, in the bone regeneration material according to the present disclosure, OCP particles hardly aggregate in gelatin, and the OCP particles are substantially independently dispersed. In particular, when the bone regeneration material according to the present disclosure (the bone regeneration material according to Example 1 described later) is observed with a scanning electron microscope (SEM), gelatin exists so as to coat (cover) the entire periphery of the OCP particles. It became clear that.
- SEM scanning electron microscope
- a bone regeneration material according to Comparative Example 2 described below is a bone regeneration material using collagen as a polymer material, that is, a bone regeneration material composed of a composite of OCP particles and collagen (OCP / Col). is there. Observation of this bone regeneration material by SEM revealed that collagen was present in some places around the OCP particles, but was not present so as to coat the entire periphery of the OCP particles.
- the bone regeneration material according to Comparative Example 1 described below uses collagen as a polymer material and hydroxyapatite particles (HAp particles) as particles of a calcium phosphate-based compound, that is, a composite of HAp particles and collagen. It is a bone regeneration material composed of a body (HAp / Col). When this bone regeneration material was observed by SEM, it appeared that the collagen fibers and the HAp particles were uniformly dispersed. Based on this observation result, it is presumed that HAp / Col in Comparative Example 1 was in a state where the HAp particles were “kneaded” into the collagen fibers. In such a state, it is presumed that the HAp particles in the outermost layer tend to fall off and the collagen skeleton tends to become brittle.
- HAp particles hydroxyapatite particles
- the bone regeneration material according to the present disclosure has a structure in which microparticle-level OCP particles, which are particles of a calcium phosphate compound, are coated with gelatin having a predetermined molecular weight. Therefore, it is considered that superior shape stability can be exhibited as compared with the conventional bone regeneration material. Further, it is considered that the bone regeneration material according to the present disclosure can further improve the shape stability by adjusting or changing the above-described conditions.
- the bone regeneration material disclosed in Patent Document 3 is also OCP / Gel.
- the fineness of the OCP particles is reduced to the nanometer level, thereby realizing good shapeability and elasticity. Is being planned. Therefore, the molecular weight of gelatin is not particularly limited. In the present disclosure, by limiting the molecular weight of gelatin and keeping the OCP particles at a micrometer level without being refined to a nanometer level, particularly good shape stability can be obtained when the OCP particles and gelatin are combined. It is thought that the nature was realized.
- the bone regeneration material according to the present disclosure can be formed into a desired shape by a known method.
- the specific molding method is not particularly limited.
- a molding die (die or the like) corresponding to a desired shape may be used.
- the formed bone regeneration material can be appropriately formed according to the shape of the bone defect part to be implanted.
- the bone regeneration material according to the present disclosure may be sterilized by a known method before use.
- the sterilization method is not particularly limited, but typically includes radiation sterilization such as gamma ray sterilization or electron beam sterilization.
- the conditions for using or applying the bone regeneration material according to the present disclosure are not particularly limited.
- typical organisms to which the bone regeneration material according to the present disclosure is applied include mammals such as mice, rats, guinea pigs, rabbits, dogs, cats, monkeys, and humans. A more preferred example is human.
- the bone regeneration material according to the present disclosure has good handling properties such as suppressing collapse during implantation and has good bone regeneration ability. Therefore, the bone regeneration material according to the present disclosure can be suitably used without any particular limitation as long as the application requires bone regeneration (purpose of use).
- Specific uses (purposes of use) of the bone regeneration material according to the present disclosure include, for example, bone defects caused by treatment of diseases such as bone tumors, bone defects caused by trauma such as fractures, and bone defects caused by autologous bone extraction. Promotion of bone regeneration in a bone defect such as a damaged bone; assistance or replacement of autologous bone (allogeneic bone) transplantation;
- the bone regeneration material according to the present disclosure When the bone regeneration material according to the present disclosure is used for the above-mentioned applications (purposes of use), it may be implanted in a bone defect site or a site that assists or substitutes for bone transplantation.
- the site where the bone regeneration material according to the present disclosure is implanted that is, the application site of the bone regeneration material is, for example, between a bone and a tendon, between a bone and a ligament, or between a bone and a bone.
- the bone regeneration material according to the present disclosure By implanting the bone regeneration material according to the present disclosure into a bone defect site of a target organism or a site that assists or substitutes for bone transplantation, absorption of bone regeneration material components (particularly, OCP / Gel) in the target organism, and The regeneration of the bone defect site is promoted.
- a bone regeneration material in a bone regeneration material containing a composite of a calcium phosphate compound and a polymer material as a main component, micrometer-level octacalcium phosphate particles (OCP particles) are used as the calcium phosphate compound. ), And a complex of OCP and gelatin (OCP / Gel) is formed using gelatin having a molecular weight within a predetermined range as a polymer material.
- compression test method for bone regeneration material As a bone regeneration material sample, a cube having a side of 10 mm (10 mm ⁇ 10 mm ⁇ 10 mm) is prepared, the bone regeneration material sample is wetted with water, and then subjected to a compression tester (manufactured by Shimadzu Corporation). (Product name: Precision Universal Testing Machine Autograph AG-IS) was compressed, and the compression force (test force) or the elastic modulus was measured.
- a moving crosshead during compression is simulated so as to simulate the following (A) a situation in which the bone regeneration material is gripped with tweezers or (B) a situation in which the user grips the bone regeneration material with a finger.
- the compression speed (crosshead speed) and compression distance (stroke length of the moving crosshead) were set to evaluate the presence or absence of breakage, collapse, etc., and the compression force or elastic modulus was measured.
- Example 1 OCP particles having a particle size of 30 ⁇ m were produced by a known method (for example, the method described in Patent Document 3.
- the bone regeneration material sample of Example 1 As described in the compression test method described above, (A) the situation where the bone regeneration material is gripped with the tweezers, and (B) the user uses the finger to apply the bone regeneration material. Physical properties were measured or evaluated by simulating a gripping situation. In addition, as described in the porosity measurement method described above, the porosity of the bone regeneration material sample of Example 1 was measured.
- results simulating the situation of (A) the results of shape stability are shown in Table 1 or Table 2, and the change in compression force (test force) with respect to the compression distance is shown by the solid line in the graph of FIG. Table 1 or 2 also shows the measurement results of the porosity.
- results of the number of tests and the shape stability are shown in Table 1, and the elastic modulus for each number of tests is shown by a diamond symbol in the graph of FIG.
- the size of the bone regeneration material sample of Comparative Example 1 is a cube (10 mm ⁇ 10 mm ⁇ 10 mm) having a side of 10 mm as in Example 1.
- Comparative Example 2 A bone regeneration material sample of Comparative Example 2 (collagen bone regeneration) was used in the same manner as in Example 1 except that collagen (manufactured by Nippon Ham Co., Ltd., product name: NMP collagen PS) was used instead of gelatin. Material). With respect to this bone regeneration material sample, in the same manner as in Example 1, the physical properties were measured or evaluated by simulating the situation (A) and the situation (B), and the porosity was measured.
- Example 3 A comparison was made in the same manner as in Example 1 except that gelatin having a molecular weight of 8.7 kDa (manufactured by Nippi Co., Ltd., product name: high-grade gelatin Type: AP, molecular weight described in the test report) was used.
- a bone regeneration material sample of Example 3 (gelatin bone regeneration material) was obtained.
- the condition (A) was simulated to evaluate shape stability and measure porosity. Table 2 shows the results of the shape stability and the porosity.
- Comparative Example 4 A bone regeneration material sample of Comparative Example 4 (gelatin bone regeneration material) was prepared in the same manner as in Example 1 except that gelatin having a molecular weight of 80 to 100 kDa (product name: RM-100, manufactured by ZELICE Co., Ltd.) was used. I got For this bone regeneration material sample, in the same manner as in Example 1, only the condition (A) was simulated to evaluate shape stability and measure porosity. Table 2 shows the results of the shape stability and the porosity.
- Example 5 A comparative example was prepared in the same manner as in Example 1 except that gelatin having a molecular weight of 230 kDa (manufactured by Nippi Co., Ltd., product name: Medigelatin Type: HMG-BP, molecular weight was data described in a test report) was used. Thus, 5 bone regeneration material samples (gelatin bone regeneration materials) were obtained. For this bone regeneration material sample, in the same manner as in Example 1, only the condition (A) was simulated to evaluate shape stability and measure porosity. Table 2 shows the results of the shape stability and the porosity.
- Example 1 the gelatin bone regenerating material according to Example 1 is (A) a situation in which the bone regenerating material is gripped with tweezers, and (B) the usage. Regardless of the situation in which the user simulates the situation in which the bone regeneration material is gripped by a finger, good shape stability can be realized. On the other hand, in the collagen bone regenerating material according to Comparative Example 1 or Comparative Example 2 in which the polymer material is collagen, even if the conditions (A) and (B) are simulated, the fracture or collapse occurs. And sufficient shape stability could not be realized.
- the compression force increases as the compression distance is gradually increased,
- the compression force rapidly increases from a compression distance of about 7 to 8 mm, and when the compression distance reaches the maximum (9 mm), the compression force also becomes maximum.
- the bone regeneration material sample is compressed without breaking. When the compression was released, the original shape before compression could be almost restored.
- the compressive force (test force) is larger than that of the gelatin bone regenerated material according to Example 1 until the compression distance reaches about 5 mm. Power has dropped. Moreover, the collagen bone regenerated material according to Comparative Example 1 was broken at a compression distance of about 3 mm.
- the collagen bone regenerated material according to Comparative Example 1 On the other hand, in the collagen bone regenerated material according to Comparative Example 1, the original shape was lost in the first compression test, and the elastic modulus was measured in the third test, although the test could be performed up to two times. No longer possible (thus, in Table 1, the number of tests is three). Further, as shown in FIG. 2, the collagen bone regeneration material according to Comparative Example 1, sudden decrease in the first elastic modulus is less than 0.02 N / mm 2 at there were 0.1 N / mm 2 near the second did.
- the bone regeneration material according to the present disclosure can restore almost the original shape without breaking or collapsing even when compressed in a state where water is contained (wet). Therefore, since the shape stability of the bone regeneration material can be made better than before, it is possible to suppress the collapse at the time of implanting, and gelatin that can realize good handleability. A bone regeneration material can be obtained.
- the present invention can be widely and suitably used in the field of bone regeneration materials.
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Abstract
Description
骨再生材料サンプルとして、1辺が10mmの立方体状のもの(10mm×10mm×10mm)を準備し、当該骨再生材料サンプルを水で湿潤させた上で、圧縮試験機(株式会社島津製作所製、製品名:精密万能試験機オートグラフAG-IS)により圧縮し、圧縮力(試験力)または弾性率を測定した。この圧縮試験としては、次の(A)ピンセットで骨再生材料を把持する状況、もしくは、(B)使用者が骨再生材料を指で把持する状況を模擬するように、圧縮時における移動クロスヘッドの圧縮速度(クロスヘッド速度)および圧縮距離(移動クロスヘッドのストローク長)を設定し、破断、崩壊等の有無を評価するとともに、圧縮力または弾性率を測定した。
クロスヘッド速度:10mm/分、圧縮距離:9mmの条件で骨再生材料サンプルを圧縮して、当該骨再生材料サンプルにおける形状安定性(破断、崩壊等の有無)を評価するとともに、当該骨再生材料サンプルの圧縮時の圧縮力[単位:N]の変化を測定した。
クロスヘッド速度:60mm/分、圧縮距離:7.5mmの条件で骨再生材料サンプルを圧縮し、そのときの弾性率[単位:N/mm2 ]を測定した。また、この圧縮および弾性率の測定を1回の試験として、当該骨再生材料サンプルを圧縮できなくなるまで、もしくは、最大10回まで試験を繰り返した。
細孔分布測定装置(Micromeritics社製、製品名:AutoPore IV 9500 V1.09)を用いた水銀圧入法により、骨再生材料サンプルと水銀との接触角を140°とし、水銀の表面張力を480dyne/cmとする測定条件下において、Washburnの式に基づいて、骨再生材料サンプルの気孔径および気孔率を測定した。
公知の方法(例えば、特許文献3に記載の方法により、粒子径が30μmのOCP粒子を製造した。このOCP粒子と分子量40~60kDaの範囲内のゼラチン(ゼライス株式会社製、製品名:RM-50)とを用いて、特許文献1に記載の方法により、1辺が10mmの立方体状(10mm×10mm×10mm)であるOCP/Gel複合体の成形物を得た。この成形物を実施例1の骨再生材料サンプルとした。
市販のコラーゲン骨再生材料である販売名「リフィット」(登録商標)を比較例1の骨再生材料サンプルとして用いた以外は、実施例1と同様にして、前記(A)の状況、並びに、前記(B)の状況を模擬して物性を測定または評価した。なお、比較例1(販売名「リフィット」)の骨再生材料サンプルのサイズは、実施例1と同様に1辺が10mmの立方体状(10mm×10mm×10mm)である。
高分子材料として、ゼラチンに代えてコラーゲン(日本ハム株式会社製、製品名:NMPコラーゲンPS)を用いた以外は、実施例1と同様にして、比較例2の骨再生材料サンプル(コラーゲン骨再生材料)を得た。この骨再生材料サンプルについて、実施例1と同様にして、前記(A)の状況、並びに、前記(B)の状況を模擬して物性を測定または評価するとともに、気孔率を測定した。
(比較例3)
ゼラチンとして、分子量8.7kDaのもの(株式会社ニッピ製、製品名:ハイグレードゼラチンType:AP、分子量は検査成績書に記載のデータ)を用いた以外は、実施例1と同様にして、比較例3の骨再生材料サンプル(ゼラチン骨再生材料)を得た。この骨再生材料サンプルについて、実施例1と同様にして、前記(A)の状況のみを模擬して形状安定性を評価するとともに気孔率を測定した。なお、形状安定性および気孔率の結果は表2に示した。
ゼラチンとして、分子量80~100kDaのもの(ゼライス株式会社製、製品名:RM-100)を用いた以外は、実施例1と同様にして、比較例4の骨再生材料サンプル(ゼラチン骨再生材料)を得た。この骨再生材料サンプルについて、実施例1と同様にして、前記(A)の状況のみを模擬して形状安定性を評価するとともに気孔率を測定した。なお、形状安定性および気孔率の結果は表2に示した。
ゼラチンとして、分子量230kDaのもの(株式会社ニッピ製、製品名:メディゼラチンType:HMG-BP、分子量は検査成績書に記載のデータ)を用いた以外は、実施例1と同様にして、比較例5の骨再生材料サンプル(ゼラチン骨再生材料)を得た。この骨再生材料サンプルについて、実施例1と同様にして、前記(A)の状況のみを模擬して形状安定性を評価するとともに気孔率を測定した。なお、形状安定性および気孔率の結果は表2に示した。
(実施例および比較例の対比)
表1における実施例1,比較例1および2の対比から明らかなように、実施例1に係るゼラチン骨再生材料は、(A)ピンセットで骨再生材料を把持する状況、並びに、(B)使用者が骨再生材料を指で把持する状況のいずれを模擬した場合であっても、良好な形状安定性を実現できる。これに対して、高分子材料がコラーゲンである比較例1または比較例2に係るコラーゲン骨再生材料では、(A)並びに(B)のいずれの状況を模擬した場合であっても、破断または崩壊が発生し、十分な形状安定性を実現することができなかった。
Claims (4)
- リン酸八カルシウム粒子およびゼラチンの複合体から少なくとも構成され、複数の気孔を有する多孔体であり、
前記リン酸八カルシウム粒子の粒子径は1μm以上1mm未満であるとともに、
前記ゼラチンは、その分子量が30kDa~70kDaの範囲内であることを特徴とする、
骨再生材料。 - 前記多孔体に含まれる前記気孔の容積比である気孔率は、87%~98%の範囲内であり、かつ、前記気孔径の中央値は、14μm~55μmの範囲内であることを特徴とする、
請求項1に記載の骨再生材料。 - 前記リン酸八カルシウム粒子の粒子径は1μm~200μmの範囲内にあることを特徴とする、
請求項1または2に記載の骨再生材料。 - 前記複合体における前記リン酸八カルシウム粒子および前記ゼラチンの含有比は、質量比で前記ゼラチン1に対してリン酸八カルシウム粒子が1~9の範囲内であることを特徴とする、
請求項1に記載の骨再生材料。
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