WO2021145362A1 - 医療用シート - Google Patents
医療用シート Download PDFInfo
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- WO2021145362A1 WO2021145362A1 PCT/JP2021/000985 JP2021000985W WO2021145362A1 WO 2021145362 A1 WO2021145362 A1 WO 2021145362A1 JP 2021000985 W JP2021000985 W JP 2021000985W WO 2021145362 A1 WO2021145362 A1 WO 2021145362A1
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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
- A61L2300/00—Biologically active materials used in bandages, wound dressings, absorbent pads or medical devices
- A61L2300/60—Biologically active materials used in bandages, wound dressings, absorbent pads or medical devices characterised by a special physical form
- A61L2300/602—Type of release, e.g. controlled, sustained, slow
- A61L2300/604—Biodegradation
-
- 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
- A61L2430/32—Materials or treatment for tissue regeneration for nerve reconstruction
-
- 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
- A61L27/54—Biologically active materials, e.g. therapeutic substances
Definitions
- the present invention relates to a sheet having a cell infiltration inhibitory action, and further, a medical sheet having a neuroprotective and / or nerve regeneration promoting action in the treatment of peripheral nerve injury (hereinafter, may be simply referred to as "the present sheet”). Regarding.
- Peripheral nerve damage is (1) a transient conduction injury without axon rupture, depending on the degree of the damage, and if it recovers completely, (2) the axon is ruptured, but the Schwann canal or If the peripheral continuity is maintained and the nerve is gradually regenerated, (3) the axons and epineurium are torn and there is no gross continuity, or even if there is scarring, the axons are continuous.
- peripheral nerve injuries that do not heal spontaneously due to self-healing power are basically treated by end-to-end suturing of the injured nerve, but if it takes a long time to recover, irreversible changes will occur in the muscle tissue. It is important to promote nerve axon regeneration (nerve regeneration) because it occurs.
- nerve axon regeneration nerve regeneration
- an inflammatory reaction is induced at the injured site, and scarring of nerves by inflammatory cells such as macrophages is one of the factors that hinder nerve regeneration. Therefore, in the treatment of peripheral nerve injury by nerve regeneration, suppressing nerve scarring by inflammatory cells has become an important issue.
- Patent Document 1 discloses a nerve regeneration sheet made of a biodegradable material for regenerating relatively thin nerve fibers such as autonomic nerves, but scarring of nerves by inflammatory cells to promote nerve regeneration. There is no description or suggestion of suppressing.
- the present invention protects nerves from the damaging action of inflammatory cells, suppresses nerve scarring, and promotes nerve regeneration by wrapping or placing them around a peripheral nerve injury site in the living body.
- the subject is to provide a medical sheet (this sheet).
- this sheet may appropriately contain a drug or the like, for example, a drug having a therapeutic effect on nerve damage, a drug having an anti-inflammatory action, or the like.
- the sheet according to any one of [1] to [4] above, wherein the average fiber diameter of the fibers is 300 to 1500 nm.
- the aliphatic polyester having the maximum value on the lowest molecular weight side is used as the low molecular weight component, and the fat having the maximum value on the highest molecular weight side.
- the group polyester is used as a high molecular weight component
- the content mass ratio of the low molecular weight component content to the sum of the content of the low molecular weight component and the content of the high molecular weight component in the non-woven fabric is 0.01 or more and 0.3 or less.
- the aliphatic polyester having the maximum value on the lowest molecular weight side is used as the low molecular weight component, and the fat having the maximum value on the highest molecular weight side.
- the group polyester is used as a high molecular weight component
- the content mass ratio of the low molecular weight component content to the sum of the content of the low molecular weight component and the content of the high molecular weight component in the non-woven fabric is 0.02 or more and 0.2 or less.
- the biodegradable aliphatic polyester is at least one selected from the group consisting of polycaprolactone, polycaprolactone diol, polylactic acid, polyglycolic acid and copolymers thereof.
- the sheet of description [16] The sheet according to the above [14] or [15], wherein the biodegradable aliphatic polyester is at least one selected from the group consisting of polycaprolactone, polycaprolactone diol and a copolymer thereof. ..
- a sheet having excellent nerve protection and / or nerve regeneration promoting action that does not give irritation can be provided.
- the present invention provides a sheet (this sheet) having a porosity of 50 to 90%, which is made of a non-woven fabric formed of fibers containing an aliphatic polyester and is preferable for exerting a cell infiltration inhibitory effect. Due to the structure of the non-woven fabric, this sheet allows body fluids to permeate, but suppresses cell infiltration, thereby having a neuroprotective and / or nerve regeneration promoting effect.
- this sheet can be made of a non-woven fabric made of fibers containing biodegradable aliphatic polyester having a molecular weight distribution in which a maximum value exists in at least two or more molecular weight regions, and is excellent in raw material.
- the period of nerve protection and / or nerve regeneration promoting action of this sheet can be adjusted to an appropriate period.
- the non-woven fabric according to this sheet is a fiber sheet, web or pad in which fibers are oriented in one direction or randomly, and paper, woven fabric, knitting, tuft and velvet felt are excluded. Further, the individual fibers may be in a stacked form, may be in a form of being entangled, fused or adhered to each other, or may be in a form in which these are combined. Furthermore, by incorporating a drug such as a nerve injury therapeutic drug into this sheet, the neuroprotective and / or nerve regeneration promoting effect can be further improved.
- Examples of the aliphatic polyester contained in the fiber forming the non-woven fabric according to this sheet include polycaprolactone, polylactic acid, polyglycolic acid, polyglycerol acid, polyhydroxyalkanoic acid, polybutylene succinate, and copolymers thereof. , Or biodegradable aliphatic polyesters such as derivatives thereof, preferably polycaprolactone or a copolymer thereof, polylactic acid or a copolymer thereof, polyglycolic acid or a copolymer thereof, or a mixture thereof. Can be mentioned.
- the above-mentioned aliphatic polyester those using a polymerization initiator such as an arbitrary diol, hydroxy acid or dicarboxylic acid can also be used, and specifically, poly ( ⁇ -) using propylene glycol or diethylene glycol as the polymerization initiator.
- a polymerization initiator such as an arbitrary diol, hydroxy acid or dicarboxylic acid
- examples thereof include caprolactone) diol (sometimes referred to simply as "polycaprolactone diol”) and polylactic acid dicarboxylic acid using fumaric acid as a polymerization initiator.
- the aliphatic polyester contained in the fiber forming the non-woven fabric according to this sheet includes polycaprolactone, polycaprolactone diol, a copolymer thereof, or a mixture thereof.
- the fiber forming the non-woven fabric according to this sheet may contain at least one or more of the above-mentioned aliphatic polyester, and is a copolymer of the biodegradable polymer other than the above-mentioned aliphatic polyester and the above-mentioned aliphatic polyester. May include. Further, it may be a copolymer containing a plurality of the above aliphatic polyesters. In the case of copolymers, the type of copolymerization may be block copolymerization, random copolymerization, alternate copolymerization or graft copolymerization.
- the aliphatic polyester may have at least two or more maximum values in the molecular weight distribution.
- the value of each maximum value is different, but the peak on the lowest molecular weight side (hereinafter, also referred to as “peak X”) and the peak on the highest molecular weight side (hereinafter, “peak Y”). It will have at least two peaks.
- the molecular weight distribution of the aliphatic polyester, which is the fiber forming the non-woven fabric according to this sheet, is determined by comparison with standard polyethylene glycol / polyethylene oxide using gel permeation chromatography (GPC) and THF as the mobile phase. Obtainable.
- the relatively low molecular weight component (hereinafter, also referred to as “low molecular weight component”) constituting the peak X of the aliphatic polyester lowers the melting temperature of the aliphatic polyester fiber and / or the aliphatic polyester fiber. It is presumed to lower the crystallinity. As a result, this sheet has excellent biodegradability. Further, since a part of this low molecular weight component is localized on the fiber surface, fiber decomposition is likely to occur from the surface.
- the relatively high molecular weight component (hereinafter, also referred to as “high molecular weight component”) constituting the peak Y of the aliphatic polyester improves the mechanical properties of the non-woven fabric, so that this sheet is structurally excellent in stability.
- the fiber forming the non-woven fabric according to this sheet is an aliphatic polyester containing a low molecular weight component and a high molecular weight component, that is, a fiber made of an aliphatic polyester having at least two or more maximum values in the molecular weight distribution
- a low molecular weight component aliphatic polyester and a high molecular weight component aliphatic polyester may be mixed.
- the polycaprolactone diol synthesized by using the diol as a polymerization initiator can be regarded as the same species as the polycaprolactone.
- the molecular weight of the low molecular weight component is not particularly limited, and examples thereof include, for example, 1000 to 7000, preferably 2000 to 6000, and more preferably 2500 to 5000 as the number average molecular weight before the sterilization treatment.
- the weight average molecular weight before the sterilization treatment is, for example, 1500 to 12000, preferably 3000 to 10000, and more preferably 4000 to 9000.
- the molecular weight of the high molecular weight component is not particularly limited, and examples of the number average molecular weight before the sterilization treatment include, for example, 40,000 to 150,000, preferably 50,000 to 140000, and more preferably 60,000 to 130,000.
- the weight average molecular weight before the sterilization treatment is, for example, 60,000 to 260000, preferably 80,000 to 240000, and more preferably 100,000 to 220,000.
- this sheet is preferably sterilized for the purpose of its use, it has been found that the molecular weight of the aliphatic polyester, which is the raw material for producing this sheet, is reduced by electron beam sterilization. That is, comparing the molecular weights of the aliphatic polyester before and after sterilization, when the electron beam irradiation dose is 20 to 30 kGy, the low molecular weight component is about 5 to 10%, and the high molecular weight component is 15 A decrease in the molecular weight of about 30% has been confirmed, and it has been found that the decrease in the molecular weight of the high molecular weight component is particularly remarkable.
- the degree of decrease in the molecular weight of the aliphatic polyester was about 5 to 10% higher than the weight average molecular weight in the number average molecular weight. Therefore, the molecular weights of the peaks X and Y of this sheet after the sterilization treatment are lower than those before the sterilization treatment by about 5 to 10% at the peak X and about 15 to 30% at the peak Y. Is expected to be.
- the molecular weight of the aliphatic polyester contained in the fibers forming the non-woven fabric according to this sheet is the degree of nerve damage to which this sheet is applied, the period until it disappears after application, and the case where a drug such as a nerve damage therapeutic agent is contained. Can be appropriately set according to the type, the rate at which the drug is released, the period of time, and the like. Even when a low molecular weight component and a high molecular weight component are blended as an aliphatic polyester, the molecular weight of each component and the blending ratio thereof are not particularly limited, and are contained in the intended use of this sheet and in this sheet described later. It can be changed as appropriate depending on the drug.
- the mass ratio of the content of the low molecular weight component to the sum of the content of the low molecular weight component and the content of the high molecular weight component in the non-woven fabric shall be, for example, 0.01 or more and 0.3 or less. , And preferably 0.02 or more and 0.2 or less. Further, by setting the low molecular weight component and the high molecular weight component within the above range, a non-woven fabric having more excellent uniformity (particularly, the fiber diameter is uniform) can be obtained.
- the aliphatic polyester may have three or more maximum values in the molecular weight distribution, and the upper limit of the number of maximum values is not particularly limited. Even when it has three or more maximum values, it is preferable that the molecular weights of peak X and peak Y are each within the above range.
- the content of the aliphatic polyester in the fibers of the non-woven fabric according to this sheet is not particularly limited, but is preferably 0.01 to 100% by weight, more preferably 0.5 to 100% by weight, based on the total weight of the fibers. It is preferable, and more preferably 25 to 100% by weight.
- the average fiber diameter of the fibers of the non-woven fabric according to this sheet is not particularly limited, but is preferably 300 to 1500 nm, more preferably 400 to 1300 nm, and even more preferably 500 to 1000 nm.
- the sheet has structurally excellent stability, and when the average fiber diameter is 1500 nm or less, the sheet has excellent flexibility, biodegradability, and cell infiltration inhibitory effect. ..
- the average fiber diameter of the fibers of the non-woven fabric according to this sheet is obtained by observing the non-woven fabric with a scanning electron microscope and arithmetically averaging the width in a direction substantially perpendicular to the length direction of about 10 fibers. Can be done.
- the weight of this sheet is not particularly limited, but when used for the purpose of treating peripheral nerve injury, for example, it suppresses nerve scarring by inflammatory cells, protects nerves, and protects nerves. And / or from the viewpoint of promoting nerve regeneration, 0.5 to 10 mg / cm 2 is preferable, 0.8 to 5 mg / cm 2 is more preferable, and 1 to 3 mg / cm 2 is further preferable.
- the density (weight per unit volume) of this sheet is not particularly limited, but when used for the purpose of treating peripheral nerve injury, for example, it suppresses nerve scarring by inflammatory cells, protects nerves, and protects nerves. And / or from the viewpoint of promoting nerve regeneration, 100 mg to 1000 mg / cm 3 is preferable, 200 mg to 800 g / cm 3 is more preferable, and 250 to 600 mg / cm 3 is further preferable.
- the thickness of this sheet is not particularly limited, but when used for the purpose of treating peripheral nerve injury, for example, it suppresses nerve scarring by inflammatory cells, protects nerves, and / or promotes nerve regeneration. 30 to 70 ⁇ m is preferable, 35 to 65 ⁇ m is more preferable, and 40 to 60 ⁇ m is further preferable, from the viewpoint of causing the nerve to be wound and applying it to a nerve-damaged part such as wrapping around a nerve.
- the thickness of the sheet can be obtained by measuring the thickness of three points with a micrometer and arithmetically averaging the values.
- the porosity of this sheet is 50-90% in that it suppresses nerve scarring by inflammatory cells, protects nerves and / or promotes nerve regeneration, for example when used in the treatment of peripheral nerve injury. Is preferable, 60 to 80% is more preferable, and 65 to 75% is further preferable.
- the porosity of this sheet is determined by the following formula based on the weight and thickness per unit area (1 cm 2 ) of this sheet and the specific gravity of aliphatic polyester (eg, 1.15 g / cm 3 in the case of polycaprolactone). Can be calculated.
- Porosity (%) (thickness-1 cm , weight per 2 ⁇ specific gravity of aliphatic polyester) ⁇ thickness ⁇ 100
- this sheet was measured by the JIS L1096 A method using a commercially available Garley-type stiffness tester. As a result, since this sheet is very soft, the rigidity and softness are less than the minimum reading scale (for example, 0.2 mN), and measurement cannot be performed. In other words, this sheet is so flexible that its rigidity and softness cannot be measured. Therefore, this sheet can be easily wrapped around a nerve at a peripheral nerve injury site or placed so as to cover the site. Further, even in such a case, this sheet has an advantage that it does not give a stimulus that adversely affects nerves and surrounding tissues.
- This sheet may contain ingredients other than the above, and examples thereof include drugs.
- the present invention can provide a sheet containing a therapeutic agent for nerve injury in order to further enhance the effect of promoting neuroprotection and / or nerve regeneration.
- this sheet containing a drug When this sheet containing a drug is applied to a medical device that is used by being placed in a living body or inserted into the body, the drug can be released into the living body as the non-woven fabric is decomposed. ..
- This sheet containing a drug can maintain the shape of the non-woven fabric in vivo for a desired period of time so that the drug is released as the non-woven fabric is decomposed, and the non-woven fabric is completely decomposed after the desired period of time. Can be done.
- the period for maintaining the shape of the non-woven fabric in the living body is not particularly limited, but there is a period of, for example, 1 to 12 months, and the period until the non-woven fabric is completely decomposed in the living body is, for example, 6 to 24 months. There is a period such as.
- a drug such as a nerve injury therapeutic drug
- This sheet can be designed by appropriately setting the period until it is completely disassembled.
- the drug contained in this sheet is not particularly limited, and examples thereof include vitamin B12 (including a pharmaceutically acceptable salt, if any, the same shall apply hereinafter) in the case of a nerve injury therapeutic drug.
- Vitamin B12 includes cobalamin and its derivatives. More specifically, methylcobalamin, cyanocobalamin, hydroxocobalamin, sulfitocobalamin, adenosylcobalamin and the like can be mentioned, with methylcobalamin, cyanocobalamin and hydroxocobalamin being preferred, and methylcobalamin being more preferred.
- the content of vitamin B12 is not particularly limited, but for example, 0.005 to 0.5 mg, more preferably 0.0075 to 0.4 mg, and 0.01 to 0.3 mg per 1 cm 2 of this sheet are preferable. More preferred.
- the content of vitamin B12 with respect to 100% by weight of this sheet is not particularly limited, but is preferably 0.3 to 30% by weight, more preferably 0.45 to 24% by weight, and 0.6 to 18%, for example. % By weight is even more preferred.
- the drug may be contained alone or in combination of two or more. The content of the drug contained in this sheet can be appropriately set according to the degree of the disease to be treated, the type of the drug, the period of release, and the like.
- This sheet can be used, for example, by embedding it in the nerve injury site and its surroundings, or by wrapping it around the nerve. As described above, since this sheet is molded so as to have flexibility, the usage mode can be appropriately selected. Specifically, for example, when surgically applying to a patient with nerve damage, the area around the affected nerve should be peeled off to expose the nerve, and then this sheet should be wrapped or covered around the nerve. It is preferable to indwell in. By applying this sheet to damaged nerves in this way, it is possible to suppress the infiltration of inflammatory cells into the nerve tissue and prevent scarring of the nerve tissue due to the damaging action of the inflammatory cells, and the damaged nerve. Can promote protection and / or regeneration of.
- This sheet is flexibly molded, and although this sheet suppresses the infiltration of inflammatory cells, it allows the body fluid that keeps the tissue in a normal state to pass through, so even if it is placed at the nerve injury site, the nerve Does not give a stimulus that adversely affects or the surrounding tissues. Therefore, this sheet can be used by wrapping it around a nerve or embedding it in a peripheral portion of a nerve injured site, and it is not necessary to remove it even after treatment of the injured site.
- This sheet is preferably sterilized before use, especially when it is applied to a living body.
- the sterilization method it is preferable to select a method in which the contained chemicals are not decomposed and the shape and physical properties of the sheet are not impaired. Examples thereof include electron beam sterilization by radiation sterilization and ethylene oxide gas (EOG) sterilization.
- EOG ethylene oxide gas
- this sheet has nerve protection and / or nerve regeneration promoting action, both continuous nerve injury with continuity at the injured part and discontinuous nerve injury with discontinuity at the injured part can be treated. It is very useful in that it can be done.
- continuous nerve damage include strangulation neuropathy (a state in which the nerve is compressed by surrounding tissues) such as carpal tunnel syndrome.
- the nerve after nerve suture (the state of being directly sutured after the nerve injury), the nerve after the nerve detachment, and the nerve after the nerve transplantation (the state where the nerve is transplanted to the damaged nerve injured part to maintain continuity). ) Is also effective in promoting regeneration.
- this sheet also has the effect of promoting treatment for discontinuous nerve damage, either alone or in combination with artificial nerves.
- the method for producing the non-woven fabric according to this sheet is not particularly limited, and a known method can be used.
- a solution containing biodegradable aliphatic polyester and, if necessary, a drug such as vitamin B12 is prepared, and for example, electrospinning method (electrospinning method), self-assembly method, phase separation method and the like are known.
- This sheet can be produced by producing fibers by the method of the above and forming a non-woven fabric.
- a suitable solvent can be used for the preparation of the solution (raw material solution), for example, trifluoroethanol (TFE), 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP), and the like.
- Chloroform, N, N-dimethylformamide (DMF) and the like can be mentioned, and they can be used alone or in combination.
- the solvent used in the raw material solution is removed in the spinning process and does not remain in the non-woven fabric. Further, various additives can be used for adjusting the electric conductivity, viscosity and the like.
- the electrospinning method using TFE as a solvent is one of the preferable production methods in that a non-woven fabric having more excellent effects of the present invention can be obtained.
- fibers are formed by applying a high voltage to the composition for electric field spinning and charging it, and a non-woven fabric can be obtained by depositing the fibers.
- a method of charging the composition for electric field spinning an electrode connected to a high-voltage power supply device is connected to the composition for electric field spinning itself or a container and applied.
- the voltage to be applied is not particularly limited, and examples thereof include 10 to 50 kV, more preferably 15 to 45 kV, and even more preferably 20 to 40 kV.
- the type of voltage may be either direct current or alternating current.
- the flow velocity of the composition for electrospinning is not particularly limited, but may be 0.2 to 0.8 mL / h, more preferably 0.3 to 0.7 mL / h, and 0.4 to 0.6 mL / h. Is even more preferable.
- the needle size is not particularly limited, but 24 to 30 G is mentioned, 25 to 29 G is more preferable, and 26 to 28 G is further preferable.
- the distance from the needle to the target electrode is not particularly limited, but may be 5 to 30 cm, more preferably 8 to 25 cm, still more preferably 10 to 20 cm.
- the total concentration of 101 kPCL and 3.9 kPCLdiol at a ratio of (A) 9: 1 and (B) 8: 2 was (1) 9: 1 and (B) 8: 2, and the total concentration of 101 kPCL and 3.9 kPCLdiol was (1).
- Each was dissolved in TFE so as to have A) 7.2% by weight and (B) 8.1% by weight to prepare a composition for electric field spinning.
- a composition for electric field spinning was separately prepared by adding methylcobalamin, which is a therapeutic agent for nerve damage, in an amount corresponding to 0.3 to 30% by weight based on the total of 101 kPCL and 3.9 kPCLdiol.
- methylcobalamin which is a therapeutic agent for nerve damage
- the prepared compositions for electric field spinning of A and B were spun using an electric field spinning device to produce sheets A and B made of a non-woven fabric.
- a needle 27G was used as the ejection device, the distance from the needle to the target electrode was 17 cm, the discharge speed was 0.5 mL / h, and the applied voltage was 30 kV.
- both sheets A and B had a thickness of 30 to 70 ⁇ m, a weight of 0.5 to 10 mg / cm 2 , and a density of 100 to 1000 mg / cm 3. rice field.
- the porosity was calculated based on the formula described in the above paragraph [0026] using the measurement results of the thickness of the sheets A and B and the weight per 1 cm 2, the porosity of the sheets A and B was 50. It was ⁇ 90%.
- Example 2 Scanning electron microscope observation The scanning electron micrographs of the sheets A and B produced in Example 1 are shown in FIG.
- the sheet A was 319.2 to 1974.0 nm
- the sheet B was 336.5 to 1333.0 nm. ..
- the average fiber diameter was calculated.
- each average fiber diameter was 933.6 ( ⁇ 457.9) nm for sheet A and 799.0 ( ⁇ 328.7) nm for sheet B.
- Example 3 Cell Infiltration Inhibition Test Sheet A produced in Example 1 and Sheet A'(hereinafter, also referred to as "PBS immersion sheet") obtained by immersing the sheet in phosphate buffered saline (PBS) for 1 month, respectively, serial numbers.
- PBS immersion sheet obtained by immersing the sheet in phosphate buffered saline (PBS) for 1 month, respectively, serial numbers.
- the cell infiltration inhibitory ability was confirmed by the following test method for three sheets (manufacturing number 1, serial number 2, serial number 3) having different (manufacturing lots).
- each insert After culturing, the lower layers of each insert were observed using a phase-contrast microscope. The cell suspension on the upper surface of the insert was removed, the insert was transferred to a new 24-well plate containing 400 ⁇ L of Cell Detachment Solution, incubated for 30 minutes under 37.0 ° C. and 5% CO 2 conditions, and then the cells attached to the lower surface of the insert. Was floated. Next, 400 ⁇ L of the medium containing the infiltrating cells remaining on the plate after culturing was added to the well from which the insert was removed and mixed.
- the unused sheet A suppressed cell permeation as in the negative control.
- the sheet A'soaked in PBS assuming that it was implanted in the living body for one month showed a tendency to allow cells to permeate slightly more than the negative control, but it was positive. Since the number of cell permeation was 1/10 or less as compared with the control, it was confirmed that both Sheet A and Sheet A'inhibited cell permeation.
- this sheet when this sheet is applied to the nerve in the peripheral nerve injury area and its surrounding area, it suppresses the infiltration of inflammatory cells such as macrophages to prevent nerve scarring, and protects the nerve and / Alternatively, it was confirmed that it has the usefulness of exerting a nerve regeneration promoting action. Furthermore, by comparing the results of Sheet A and Sheet A', the strongest effect of this sheet on inflammatory cells was confirmed at the initial stage of application of this sheet to inflammatory cells, and it was biodegradable. It was confirmed that the action tends to gradually weaken as the disease progresses.
- Example 4 Body fluid permeability test The body fluid permeability of this sheet of serial numbers 1 to 3 (the same sheet as sheet A of Example 3) was confirmed by the following test method for measuring the permeability of albumin solution.
- this sheet of each serial number and a 0.4 ⁇ m pore size membrane as a sample to be compared were attached to the inserts (one each).
- Each well of the 24-well plate was filled with 500 ⁇ L of Dulbeccoline buffered saline (DPBS) and each insert was overlaid. From the top layer of the insert, 100 ⁇ L of a 3% human serum albumin (HSA) solution prepared using DPBS was added. If necessary, this 24-well plate was shielded from light with aluminum foil, placed in a carbon dioxide incubator (37.0 ° C., 5% CO 2 ), and allowed to stand for 18 hours. After standing, the solution under each insert was collected and used as a sample solution.
- DPBS Dulbeccoline buffered saline
- HSA human serum albumin
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Abstract
Description
[2]厚みが30~70μmである、前記[1]に記載のシート。
[3]重量が0.5~10mg/cm2である、前記[1]又は[2]に記載のシート。
[4]密度が100~1000mg/cm3である、前記[1]~[3]のいずれかに記載のシート。
[5]前記繊維の平均繊維径が300~1500nmである、前記[1]~[4]のいずれかに記載のシート。
[6]前記繊維に含有される脂肪族ポリエステルが、少なくとも2箇所以上の分子量の領域に極大値が存在する分子量分布を有するものである前記[1]~[5]のいずれかに記載のシート。
[7]前記分子量の領域の少なくとも一箇所が、滅菌処理前の数平均分子量として1000~7000の領域である、前記[6]に記載のシート。
[8]前記分子量の領域の少なくとも一箇所が、滅菌処理前の数平均分子量として40000~150000の領域である、前記[6]又は[7]に記載のシート。
[9]前記分子量の領域の少なくとも一箇所が、滅菌処理前の数平均分子量として50000~140000の領域である、前記[6]又は[7]に記載のシート。
[10]前記分子量の領域が、滅菌処理前の数平均分子量で1000~7000の領域及び40000~150000の領域の少なくとも2箇所である、前記[6]~[9]のいずれかに記載のシート。
[11]前記分子量の領域が、滅菌処理前の数平均分子量で1000~7000の領域及び50000~140000の領域の少なくとも2箇所である、前記[6]~[9]のいずれかに記載のシート。
[12]前記不織布を形成する繊維中に含有される脂肪族ポリエステルのうち、最も低分子量側の極大値を有する前記脂肪族ポリエステルを低分子量成分とし、最も高分子量側の極大値を有する前記脂肪族ポリエステルを高分子量成分としたとき、前記不織布中における低分子量成分の含有量と高分子量成分の含有量の和に対する、低分子量成分の含有量の含有質量比が0.01以上0.3以下である、前記[6]~[11]のいずれかに記載のシート。
[13]前記不織布を形成する繊維中に含有される脂肪族ポリエステルのうち、最も低分子量側の極大値を有する前記脂肪族ポリエステルを低分子量成分とし、最も高分子量側の極大値を有する前記脂肪族ポリエステルを高分子量成分としたとき、前記不織布中における低分子量成分の含有量と高分子量成分の含有量の和に対する、低分子量成分の含有量の含有質量比が0.02以上0.2以下である、前記[6]~[11]のいずれかに記載のシート。
[14]前記脂肪族ポリエステルが、生分解性である、前記[1]~[13]のいずれかに記載のシート。
[15]前記生分解性の脂肪族ポリエステルが、ポリカプロラクトン、ポリカプロラクトンジオール、ポリ乳酸、ポリグリコール酸及びそれらの共重合体からなる群より選択される少なくとも1種である、前記[14]に記載のシート。
[16]前記生分解性の脂肪族ポリエステルが、ポリカプロラクトン、ポリカプロラクトンジオール及びそれらの共重合体からなる群より選択される少なくとも1種である、前記[14]又は[15]に記載のシート。
[18]さらに、神経保護及び/又は神経再生促進作用を有する、前記[1]~[17]のいずれかに記載のシート。
[19]前記神経保護及び/又は神経再生促進作用が神経の瘢痕化の抑制によるものである、前記[18]に記載のシート。
[20]さらに、薬剤を含有する、前記[1]~[19]のいずれかに記載のシート。
[21]薬剤が神経損傷治療薬である、前記[20]に記載のシート。
[22]前記神経損傷治療薬がビタミンB12である、前記[21]に記載のシート。
[23]前記ビタミンB12がメチルコバラミンである、前記[22]に記載のシート。
[24]前記ビタミンB12の含有量が前記シート1cm2当たり0.005~0.5mgである、前記[22]又は[23]に記載のシート。
[25]前記ビタミンB12の含有量が前記シート1cm2当たり0.0075~0.4mgである、前記[22]又は[23]に記載のシート。
[26]生体の神経損傷部位の周辺部に埋め込んで使用される、前記[1]~[25]のいずれかに記載のシート。
[27]生体の神経損傷部位の神経周囲に巻いて使用する、前記[1]~[25]のいずれかに記載のシート。
[28]前記生体がヒトである、前記[26]又は[27]に記載のシート。
[29]滅菌処理が施された、前記[1]~[28]のいずれかに記載のシート。
[30]前記滅菌処理が電子線滅菌又はEOG滅菌である、前記[29]に記載のシート。
本シートに係る不織布を形成する繊維を、低分子量成分及び高分子量成分を含有する脂肪族ポリエステル、すなわち、分子量分布において少なくとも2つ以上の極大値を有する脂肪族ポリエステルからなる繊維とする場合は、通常、低分子量成分の脂肪族ポリエステルと高分子量成分の脂肪族ポリエステルを混合すればよい。この場合、低分子量成分の脂肪族ポリエステルと高分子量成分の脂肪族ポリエステルは、親和性の点において、同一種を用いることが好ましい。なお、上述した脂肪族ポリエステルにおいて、ジオールを重合開始剤として用いて合成されたポリカプロラクトンジオールは、ポリカプロラクトンと同一種であると見なされ得る。
一方、高分子量成分の分子量としては、特に制限はされないが、滅菌処理前の数平均分子量として、例えば40000~150000、好ましくは50000~140000、さらに好ましくは60000~130000が挙げられる。また、滅菌処理前の重量平均分子量として、例えば、60000~260000、好ましくは80000~240000、さらに好ましくは100000~220000が挙げられる。
空隙率(%)=(厚み-1cm2当たりの重量÷脂肪族ポリエステルの比重)÷厚み×100
ゲル浸透クロマトグラフィー法により測定した数平均分子量が101000(n=2の平均値)であるポリカプロラクトン(本実施例では「101kPCL」ともいう。)と、同法より測定した数平均分子量が3865(n=2の平均値)であるポリカプロラクトンジオール(本実施例では「3.9kPCLdiol」ともいう。)を準備した。
実施例1で製造したシ-トA及びBの走査型電子顕微鏡写真を図1に示した。また、シ-トA及びBについて、電子顕微鏡写真から、10本の繊維径を計測した結果、シートAが319.2~1974.0nmで、シートBが336.5~1333.0nmであった。各々について、平均繊維径(±標準偏差)を算出した。結果の一例として、各平均繊維径はシートAが933.6(±457.9)nm、シートBが799.0(±328.7)nmであった。
実施例1で製造したシートA及び該シートを1ヶ月間リン酸緩衝生理食塩液(PBS)に浸漬したシートA’(以下「PBS浸漬シート」ということもある)の各々製造番号(製造ロット)が異なる3枚(製造番号1、製造番号2、製造番号3)について、下記の試験方法により細胞湿潤阻害能を確認した。
本シートを、遮光下、37℃±1℃(成り行き湿度)で、1枚当たり100mLのPBSに1ヶ月間浸漬した。浸漬後のシート及びPBS浸漬液全量をフィルターシステム(製造番号:430770、Corning Incorporated)のフィルター上層部に入れ、緩やかに吸引ろ過した。フィルターシステム上層部の内壁面及びフィルター上のシートを約10mLの滅菌精製水(日本薬局方)を用いて10回緩やかに吸引ろ過しながら洗いこみ、該シートを滅菌済みの濾紙の上に置いて、クリーンベンチ内で12時間以上自然乾燥させた。
セルカルチャーインサート(製造番号:CBA-102(Part No.10201)、CELL BIOLABS,INC.)に貼り付けられているメンブランを剥がした。次に、直径約2.5cmの円状に切り出したシートA又はシートA’を、白色ワセリン(健栄製薬(株))を用いて、インサートの底面~側面を覆うように貼り付け、さらにインサート側面にパラフィルムを巻きつけて各シートを保持した。同様に、陰性対照として、0.4μmポアサイズのメンブランを貼り付けたインサート、及び、陽性対照として、5μmポアサイズのメンブランを貼り付けたインサートを各々3個作製した。
THP-1細胞(ヒト単球由来細胞株、American Type Culture Collection)の濃度が1.5×106 cells/mLとなるよう、無血清培地(RPMI 1640、10%牛胎児血清(FBS))を用いて細胞浮遊液を調製した。24ウェルプレートの各ウェルに500μLの牛胎児血清(走化性因子)含有培地(RPMI 1640、10%FBS)を入れ、その上に各々のインサート(各3個)を重ね、各インサートの上層に細胞浮遊液100μLを添加した。なお、シートA、シートA’、陰性対照及び陽性対照各々において、インサート上層に無血清培地を添加したものを各1個用意し、ブランクコントロールとした。これらの24ウェルプレートを、必要に応じて、アルミホイルで遮光し、炭酸ガス培養器(37.0℃、5%CO2)に入れ、18時間培養した。
製造番号1~3の本シート(実施例3のシートAと同じシート)について、アルブミン液の透過性を測定する下記の試験方法により、体液透過性を確認した。
Claims (30)
- 脂肪族ポリエステルを含有する繊維で形成された不織布からなり、空隙率が50~90%である、細胞浸潤抑制作用を有するシート。
- 厚みが30~70μmである、請求項1に記載のシート。
- 重量が0.5~10mg/cm2である、請求項1又は2に記載のシート。
- 密度が100~1000mg/cm3である、請求項1~3のいずれか一項に記載のシート。
- 前記繊維の平均繊維径が300~1500nmである、請求項1~4のいずれか一項に記載のシート。
- 前記繊維に含有される脂肪族ポリエステルが、少なくとも2箇所以上の分子量の領域に極大値が存在する分子量分布を有するものである請求項1~5のいずれか一項に記載のシート。
- 前記分子量の領域の少なくとも一箇所が、滅菌処理前の数平均分子量として1000~7000の領域である、請求項6に記載のシート。
- 前記分子量の領域の少なくとも一箇所が、滅菌処理前の数平均分子量として40000~150000の領域である、請求項6又は7に記載のシート。
- 前記分子量の領域の少なくとも一箇所が、滅菌処理前の数平均分子量として50000~140000の領域である、請求項6又は7に記載のシート。
- 前記分子量の領域が、滅菌処理前の数平均分子量で1000~7000の領域及び40000~150000の領域の少なくとも2箇所である、請求項6~9のいずれか一項に記載のシート。
- 前記分子量の領域が、滅菌処理前の数平均分子量で1000~7000の領域及び50000~140000の領域の少なくとも2箇所である、請求項6~9のいずれか一項に記載のシート。
- 前記不織布を形成する繊維中に含有される脂肪族ポリエステルのうち、最も低分子量側の極大値を有する前記脂肪族ポリエステルを低分子量成分とし、最も高分子量側の極大値を有する前記脂肪族ポリエステルを高分子量成分としたとき、前記不織布中における低分子量成分の含有量と高分子量成分の含有量の和に対する、低分子量成分の含有量の含有質量比が0.01以上0.3以下である、請求項6~11のいずれか一項に記載のシート。
- 前記不織布を形成する繊維中に含有される脂肪族ポリエステルのうち、最も低分子量側の極大値を有する前記脂肪族ポリエステルを低分子量成分とし、最も高分子量側の極大値を有する前記脂肪族ポリエステルを高分子量成分としたとき、前記不織布中における低分子量成分の含有量と高分子量成分の含有量の和に対する、低分子量成分の含有量の含有質量比が0.02以上0.2以下である、請求項6~11のいずれか一項に記載のシート。
- 前記脂肪族ポリエステルが、生分解性である、請求項1~13のいずれか一項に記載のシート。
- 前記生分解性の脂肪族ポリエステルが、ポリカプロラクトン、ポリカプロラクトンジオール、ポリ乳酸、ポリグリコール酸及びそれらの共重合体からなる群より選択される少なくとも1種である、請求項14に記載のシート。
- 前記生分解性の脂肪族ポリエステルが、ポリカプロラクトン、ポリカプロラクトンジオール及びそれらの共重合体からなる群より選択される少なくとも1種である、請求項14又は15に記載のシート。
- 前記細胞が炎症性細胞である、請求項1~16のいずれか一項に記載のシート。
- さらに、神経保護及び/又は神経再生促進作用を有する、請求項1~17のいずれか一項に記載のシート。
- 前記神経保護及び/又は神経再生促進作用が神経の瘢痕化の抑制によるものである、請求項18に記載のシート。
- さらに、薬剤を含有する、請求項1~19のいずれか一項に記載のシート。
- 薬剤が神経損傷治療薬である、請求項20に記載のシート。
- 前記神経損傷治療薬がビタミンB12である、請求項21に記載のシート。
- 前記ビタミンB12がメチルコバラミンである、請求項22に記載のシート。
- 前記ビタミンB12の含有量が前記シート1cm2当たり0.005~0.5mgである、請求項22又は23に記載のシート。
- 前記ビタミンB12の含有量が前記シート1cm2当たり0.0075~0.4mgである、請求項22又は23に記載のシート。
- 生体の神経損傷部位の周辺部に埋め込んで使用される、請求項1~25のいずれか一項に記載のシート。
- 生体の神経損傷部位の神経周囲に巻いて使用する、請求項1~25のいずれか一項に記載のシート。
- 前記生体がヒトである、請求項26又は27に記載のシート。
- 滅菌処理が施された、請求項1~28のいずれか一項に記載のシート。
- 前記滅菌処理が電子線滅菌又はEOG滅菌である、請求項29に記載のシート。
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US20230066066A1 (en) | 2023-03-02 |
JPWO2021145362A1 (ja) | 2021-07-22 |
EP4091643C0 (en) | 2024-07-24 |
TW202145979A (zh) | 2021-12-16 |
KR20220130114A (ko) | 2022-09-26 |
IL294750A (en) | 2022-09-01 |
CA3164415A1 (en) | 2021-07-22 |
JP7044288B2 (ja) | 2022-03-30 |
ZA202208035B (en) | 2023-12-20 |
EP4091643B1 (en) | 2024-07-24 |
AU2021208828A1 (en) | 2022-07-28 |
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EP4091643A4 (en) | 2023-08-02 |
CN115023246A (zh) | 2022-09-06 |
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