WO2013166616A1 - Biomaterial que comprende quitosano y al menos glicosaminoglicano - Google Patents
Biomaterial que comprende quitosano y al menos glicosaminoglicano Download PDFInfo
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- WO2013166616A1 WO2013166616A1 PCT/CL2012/000023 CL2012000023W WO2013166616A1 WO 2013166616 A1 WO2013166616 A1 WO 2013166616A1 CL 2012000023 W CL2012000023 W CL 2012000023W WO 2013166616 A1 WO2013166616 A1 WO 2013166616A1
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- chitosan
- glycosaminoglycan
- aqueous
- solid
- chondroitin sulfate
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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
- A61L27/14—Macromolecular materials
- A61L27/16—Macromolecular materials obtained by reactions only involving carbon-to-carbon unsaturated bonds
-
- 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
- A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
- A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
- A61L15/22—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing macromolecular materials
- A61L15/225—Mixtures of macromolecular compounds
-
- 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
- A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
- A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
- A61L15/22—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing macromolecular materials
- A61L15/28—Polysaccharides or their derivatives
-
- 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
- A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
- A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
- A61L15/42—Use of materials characterised by their function or physical properties
- A61L15/44—Medicaments
-
- 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
- A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
- A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
- A61L15/42—Use of materials characterised by their function or physical properties
- A61L15/62—Compostable, hydrosoluble or hydrodegradable materials
-
- 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
- A61L27/14—Macromolecular materials
- A61L27/20—Polysaccharides
-
- 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
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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
- A61L27/50—Materials characterised by their function or physical properties, e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials
- A61L27/58—Materials at least partially resorbable by the body
Definitions
- the present invention relates to the field of materials and / or biomaterials for implantation in the human or animal body.
- the present invention relates to a biocompatible and bioabsorbable solid or semi-solid material that allows tissue regeneration and neovascularization in people who have suffered wounds.
- the present invention provides a biocompatible and bioabsorbable solid material comprising chitosan and at least one glycosaminoglycan (GAG) or derivative thereof and optionally one or more additional active ingredients.
- the invention also relates to a process for preparing a biocompatible solid material through the formation of nanoparticles, and their use in the repair and regeneration of damaged organic tissue.
- An optimal medical material or device not only protects the wound from its surroundings, but also has several properties related to its structure and its mechanical characteristics. Therefore, the following parameters are important in the development of a device or material for
- wound healing i wound healing.
- the wound optimization of adhesion, wound bed care, control of moisture permeability, infection control, safety, pain management;
- devices or materials physical adaptation, stability in situ, cost-efficiency, stability in storage, ease of handling by users (doctors, nurses and / or patients) and finally, the comfort of patients when using it.
- silicone gels or silicone oils
- silicone is often the cause of chronic inflammation, granuloma formation and delayed hypersensitivity reactions.
- Collagen suspensions have also been widely used for the past ten years.
- collagen is generally of bovine origin, which is not desirable for health and is generally subject to additional regulatory requirements.
- Collagen-based materials used in medical applications such as medical devices are also known in the state of the art. Because collagen is a biomateria, materials produced from it produce fewer complications than materials produced from synthetic compounds. Collagen forms a matrix that can be used as an implant for tissue regeneration, however, it is known that collagen matrices can cause serious communicable diseases in humans, by viruses and prions.
- Chitosan offers several desirable properties; Chitosan is known to be non-toxic and biocompatible as it is processed under rather extreme conditions, such as exposure to alkali.
- Glycosaminoglycans are polymers that are widely distributed particularly in the connective tissues of living things. Condrotin sulfate, dermatan sulfate, heparan sulfate and hyaluronic acid, among others, belong to this group of molecules. Various functions have been described for glycosaminoglycans in living tissues, such as their ability to interact with proteoglycans and function as regulatory molecules of cellular processes, capable of guiding chemoattraction and binding or promoting the increase of microenvironmental concentrations of cytokines. , growth factors and other soluble proteins in the matrix.
- FGF-2 fibroblast growth factor-2
- FGF-2 fibroblast growth factor-2
- a material for the treatment of wounds or an implant comprising one or more of one of the aforementioned compounds, which is stable in a biological environment but which can eventually biodegrade over time. It is also desirable for said material to maintain its structure without the incorporation of crosslinking agents or additional coatings.
- the material is not derived from animal protein, comprising biocompatible components, that is structurally stable after application to the patient's body, that has good integration properties to the wound bed, that is biocompatible and biodegradable, and that is easily applicable and storable.
- a method of preparing a biomaterial that can be used as a substitute for regenerating tissues comprises the formation of polymeric chitosan nanoparticles and at least one glycosaminoglycan derivative.
- Polymeric nanoparticles are stable structures with homogeneous, reproducible and modular characteristics that are formed as a consequence of the bonding of one or more polymers under strict and controlled conditions. This interaction generates characteristic physical entities, which are independent and observable, whose average size is less than 1 ⁇ , that is, between 1 and 999 nm.
- the prior art has described processes for preparing polymeric nanoparticles by incorporating crosslinking agents, which can form bonds of different nature between the components of the nanoparticles.
- crosslinking agents has been questioned in the prior art due to their potential toxic effects.
- Figure 1 corresponds to a suspension of chitosan and chondroitin sulfate nanoparticles.
- Figure 2 corresponds to an image of transmission electron microscopy (TEM, magnification: 42,000 X) of the chitosan and chondroitin sulfate nanoparticles in a nanoparticulate suspension according to the invention, which has been developed by negative staining in racks with collodion.
- the red circles show macromolecular structures in the form of morulae of 400 nm in diameter (average).
- Figure 3 corresponds to an image of the finished material of the invention and comprising chitosan nanoparticles and chondroitin sulfate.
- Figure 4 corresponds to a scanning electron microscopy (SEM) image of the solid material. It is appreciated that this has a heterogeneous porous structure, with pores of 100 ⁇ .
- Figure 5 corresponds to an image of the finished and packed solid material of the invention.
- Figure 6a graphs the effect of the material of the invention on the growth of human fibroblasts.
- Figure 6b graphs the effect of the material of the invention on the growth of the EA.hy926 endothelial cell line.
- Figure 7 shows closure of excisional wound in the left hemidorsal region in experimental animal treated with polymer matrix (A left and B) while the untreated wound of the right hemidorso (A right and C) does not reveal changes significant in size or depth.
- Figure 8 shows the histopathology of the closure of the excisional wound in rabbits after the application of the solid material (figure 8.1) and without its application (figure 8.2).
- Figure 9 depicts the evaluation of the ability of the solid material to induce wound healing in a patient with diabetic foot and ear amputation.
- a deep wound with fascelated tissue in the bed is observed, (a).
- Progressively the wound is contracted and filled with granular tissue until day 32, (b).
- WO 200711416 describes a method for the preparation of a porous chitosan coating comprising providing an acidic aqueous solution of chitosan and a solvent that does not dissolve the chitosan; and lyophilize the acidic aqueous solution, wherein the solvent is selected from alcohols such as aliphatic alcohols, ethylene glycol monoethyl ether, dioxane, tetrahydrofuran, among others.
- alcohols such as aliphatic alcohols, ethylene glycol monoethyl ether, dioxane, tetrahydrofuran, among others.
- US 2009/0068250 describes a bioabsorbable and biocompatible compound for surgical use composed of a collagen crosslinked with a glycosaminoglycan, where the active components are joined by means of covalent bonds using collagen, functionalizing the amino and carboxylate groups of their amino acids.
- the present invention relates to materials or biomaterials for use in medical applications such as an implant for repair of biological tissues and / or regeneration of biological tissues. These biomaterials can be used in any area of the technique that involves, for example, repair of damaged biological tissues or replacement of biological tissues.
- the biomaterial of the invention comprises at least one porous layer comprising chitosan and at least one glycosaminoglycan.
- Chitosan is a semi-synthetic linear polymer that is obtained by chitin N-deacetylation. This causes the copolymer composed of N-acetylglucosamine and glucosamine.
- the chitosan is represented by the following structure:
- Said degree of deacetylation is generally in the range between 30 to 95%, preferably between 55 and 90%, which indicates that between 5 and 70%, preferably between 10 and 45% of the amino groups is acetylated.
- the chitosan used to form the nanoparticles according to the invention has a molecular weight ranging from 2,000 to 2,000,000 g / mol, preferably between 2,000 and 500,000 g / mol, more preferably between 10,000 and 200,000 g / mol.
- a derivative thereof can be used, this being understood as chitosan molecules in which one or more groups and / or one or more groups amino have been modified, with the aim of modifying polymer solubility, adhesion or other properties.
- the chitosan according to the invention can also be in the form of a salt, which is selected from the salts of hydrochloride, carbamate, acetate, sulfate and glutamate; where the salt is preferably selected from hydrochloride.
- the chitosan is selected from chitosan hydrochloride and has a molecular weight of between 2,000 and 2,000,000 g / mol, preferably between 2,000 and 500,000 g / mol and more preferably between 10,000 and 200,000 g / mol.
- glycosaminoglycans which correspond to the second group of components of the material or biomaterial of the invention, are structural polysaccharides that form a large part of the intercellular matrix of mesodermal tissues (conjunctive, cartilage, muscle, bone) and that very frequently occur attached to a Protein nucleus, forming the so-called proteoglycans.
- the structure of the glycosaminoglycans is of the copolymer type in which one of the monomer units is a uronic acid while the other is an aminosaccharide. Some of the hexoses that are part of these polysaccharides have a negative charge, which gives glycosaminoglycans a polyanionic character, with a high negative charge density.
- glycosaminoglycans according to the invention are preferably selected from chondroitin sulfate, hyaluronic acid, heparan sulfate, keratan sulfate, heparin sulfate, dermatan sulfate and a mixture thereof, of which chondroitin-6-sulfate, chondroitin-4- are preferably selected sulfate and hyaluronic acid.
- Chondroitin sulfate is a sulfated glycosaminoglycan.
- the basic structure of this molecule contains between 15 and 150 basic units of N-acetylglucosamine and glucuronic acid.
- Position 2 of glucoronic acid and / or position 4 and 6 N-acetylglucosamine sulfates are found in different types of chondroitin sulfate.
- Chondroitin sulfate is represented by the following structure:
- chondroitin sulfate suggests a salt contraionized with sulfate groups, this is not the case, since sulfate is covalently bound to sugar.
- the term chondroitin sulfate also includes organic and inorganic salts.
- these salts are, for example, prepared by reacting the basic form of the compound with the stoichiometric amount of an appropriate acid in water, or in an organic solvent, or a mixture of both.
- inorganic salts include, but are not limited to, sodium, potassium, calcium, zinc, ammonium, magnesium, aluminum and lithium.
- Organic salts include, for example, ethylenediamine, ethanolamine, N, N-dialikylenetanolamine, triethanolamine, glucamine and basic amino acid salts.
- the chondroitin sulfate salt is selected from the sodium salt and has a molecular weight between 7,500 and 75,000 g / mol.
- the hyaluronic acid according to the invention is a carboxylated glycosaminoglycan composed of carbohydrate chains containing approximately 50,000 disaccharides of N-acetylglucosamine and glucuronic acid.
- Hyaluronic acid is represented by the following structure:
- Hyaluronic acid allows to retain large amounts of water and adopts an extended conformation in solution, so it facilitates migration and cellular function during tissue regeneration and also acts as a support and lubricant. These properties are achieved thanks to the large number of OH groups and negative charges of this molecule, which allows, by the establishment of repulsive forces, that the carbohydrate chains are relatively separated from each other.
- the biological activity of hyaluronic acid is influenced by the size of the polymer chain. An example of this is that hyaluronic acid molecules of lower molecular weight have proangiogenic activity and act as ligand of the CD40 receptor that is expressed in the cell membrane of endothelial cells.
- the hyaluronic acid is in the form of a salt, which is selected from sodium, potassium, magnesium, calcium and zinc salt.
- the hyaluronic acid salt is sodium.
- the hyaluronic acid salt is selected from the sodium salt and has a molecular weight between 3,000 and 200,000 g / mol.
- the material comprises chitosan and cohdroitin sulfate. In another embodiment of the invention, the material comprises chitosan and hyaluronic acid. In other embodiment of the invention, the material comprises chitosan, chondroitin sulfate and hyaluronic acid.
- the material of the invention comprises chitosan, its salts or derivatives in an amount ranging from 10% to 90% by weight with respect to the total weight of the material, preferably between 40% and 60% by weight with respect to the total weight. of the material, more preferably between 45% and 55% by weight with respect to the total weight of the material, and at least one additional glycosaminoglycan derivative or its salts in an amount ranging from 10% to 90% by weight with respect to to the total weight of the material, preferably between 40% and 60% by weight with respect to the total weight of the material, more preferably between 45% and 55% by weight with respect to the total weight of the material, where at least one derivative Additional glycosaminoglycan or its salts is selected from chondroitin sulfate, hyaluronic acid, heparan sulfate, keratan sulfate, heparin sulfate, dermatan sulfate or a mixture of these.
- the material of the invention may comprise additional active ingredients such as: peptides, proteins, saccharide compounds, low molecular weight drugs, nucleic acid and nucleotide compounds or combinations thereof.
- the material of the invention further comprises methylene blue, which allows the material to be applied directly on a tissue of interest to treat conditions such as cancer, and infections in general, with infections caused by particular interest. by fungi
- the material of the invention allows to control the state of aggregation of the active ingredient, thus modulating its therapeutic efficacy.
- Methylene blue is present in the material of the invention in percentages of total mass of the material ranging between 0.05% and 5% and preferably between 0.05% and 2.5%.
- the material of the invention further comprises antibiotic compounds, which allow the material to be applied directly to a tissue of interest to treat bacterial infections. Accordingly, flumechin and / or sulfadoxine compounds are preferred, which are present in the material of the invention in percentages of total mass of the material ranging between 5% and 40%, preferably between 15% and 30 %, preferably about 25%.
- the material of the invention can be molded to suit the shape and depth requirements of the wound to be treated.
- the material of the invention is prepared from an aqueous chitosan solution and an aqueous solution comprising the glycosaminoglycan (s), which are simultaneously incorporated on a container containing water, forming a nanoparticulate suspension, which It is subsequently frozen and lyophilized.
- the material of the invention is prepared from an aqueous chitosan solution and an aqueous solution comprising chondroitin sulfate, which are simultaneously incorporated into a container containing water, forming a nanoparticulate suspension, which is subsequently frozen and lyophilized.
- the material of the invention is prepared from an aqueous chitosan solution and an aqueous solution comprising hyaluronic acid, which are simultaneously incorporated into a container containing water, forming a nanoparticulate suspension, which is subsequently frozen and lyophilized.
- the material of the invention is prepared from an aqueous solution of chitosan and an aqueous solution comprising chondroitin sulfate and hyaluronic acid, which are simultaneously incorporated on a container containing water, forming a nanoparticulate suspension, which is subsequently frozen and lyophilized.
- the material of the invention comprises more than one glycosaminoglycan, in the process of preparing these, they can also be incorporated into water in a single solution comprising the selected compounds.
- the size of the nanoparticles formed by the addition of chitosan and at least one glycosaminoglycan on deionized water have a size smaller than 1 ⁇ , preferably between 100 and 500 nm, preferably between 150 and 180 nm.
- the process for the preparation of the material of the invention comprises the formation of nanoparticles between the active components that comprise it.
- Chitosan nanoparticles plus at least one additional glycosaminoglycan are characterized in that they have been formed by joint nanoprecipitation between chitosan, and at least one glycosaminoglycan due mainly to electrostatic interactions between constituents, forming ionic bonds.
- the nanoparticles of the invention are not crosslinked by low molecular weight crosslinkers, such as aldehydes and other additives that react with the components generating covalent bonds and others such as tripolyphosphate and other additives that react with the components forming ionic bonds.
- low molecular weight crosslinkers such as aldehydes and other additives that react with the components generating covalent bonds and others such as tripolyphosphate and other additives that react with the components forming ionic bonds.
- the process for preparing the solid or semi-solid material as defined above in the present invention comprises the steps of:
- a) preparing a nanoparticulate aqueous suspension comprising chitosan and / or its derivatives and / or its salts and at least one glycosaminoglycan and / or its derivatives and / or its salts, which are preferably selected from chondroitin sulfate and / or hyaluronic acid and optionally incorporate one or more active ingredients;
- c) remove the solvent, preferably by lyophilization; d) optionally molding and / or compressing the material and / or sterilizing the material; and e) optionally store it in a sterile container.
- the aqueous suspension of nanoparticles a) is formed by: i) providing an aqueous solution of chitosan, which has a pH in the range of 3.8-6.3, preferably 4.5-5 , 5, preferably 4.8-5.2
- ii) provide an aqueous chondroitin sulfate solution and / or an aqueous solution of hyaluronic acid, which has a pH in the range of 3.8-6.3, preferably 4.5-5.5, preferably 4.8- 5.2
- iii) pour the chitosan aqueous solution and simultaneously pour the chondroitin sulfate aqueous solution and / or the hyaluronic acid aqueous solution onto an appropriate container containing deionized water which has a pH in the range of 3.8 - 6.3 , preferably 4.5-5.5, preferably 4.8-5.2, to thereby form an aqueous nanosuspensióri.
- step iii) is performed under magnetic stirring and at a temperature in the range of 0-100, preferably between 15-25 ° C.
- the incorporation of chondroitin sulfate and / or ' hyaluronic acid, as appropriate, onto the vessel containing deionized water can be performed by mixing the solutions containing these components.
- the incorporation of the solutions of chitosan, chondroitin sulfate and hyaluronic acid, as appropriate, on the container containing deionized water is carried out dropwise.
- the term "drop by drop” represents adding a volume of approximately between 0.70 - 1.30 mL / min, more preferably 0.80 - 1.20 mL / min, more preferably 0.80 - 1.00 mL / min, more preferably 0.88 mL / min.
- the incorporation of the cationic sulfadoxine compound into the material of the invention is carried out by incorporating it under stirring into the chitosan solution which will subsequently be added simultaneously with the solution containing one or more glycosaminoglycans on the vessel containing deionized water. .
- the incorporation of the anionic compound flumequina sulfadoxine in the material of the invention is carried out by incorporating it under stirring into the solution of the glycosaminoglycan which will subsequently be added simultaneously with the solution containing chitosan on the vessel containing deionized water.
- step b) of freezing is carried out by methods known in the state of the art to reach a temperature of -200 to 0 ° C, preferably from -80 to 0 ° C, preferably from -30 to 0 ° C and more preferably of -20 ° C.
- the frozen composition is lyophilized using routine procedures of the art.
- the sublimation temperature and the pressure used depend on the experimental conditions in which it works. Preferred temperatures range from -40 to -70 ° C under pressure conditions between 0.01 to 0.1 mBar, preferably between 0.02 and 0.06 mBar.
- the time required to lyophilize depends on the amount of material to be prepared, the preferred lyophilization times vary between 30 and 90 hours, preferably between 25 and 35 hours.
- the nanoparticulate suspension comprises chitosan and chondroitin sulfate in the following concentrations.
- the nanoparticulate suspension comprises chitosan and hyaluronic acid in the following concentrations:
- Hyaluronic acid in a concentration between 0.1 16 mg / mL to 0.83 mg / mL, more preferably about 0.464 mg / mL.
- the nanoparticulate suspension comprises chitosan, chondroitin sulfate and hyaluronic acid in the following concentrations:
- Chondroitin sulfate in a concentration of approximately 0.294 mg / mL.
- Hyaluronic acid in a concentration of approximately 0.232 mg / mL.
- the nanoparticulate suspension comprises chitosan, chondroitin sulfate and sulfadoxine, in the following concentrations:
- Chondroitin sulfate in a concentration of approximately 0.252 mg / mL.
- the nanoparticulate suspension comprises chitosan, hyaluronic acid and fiumequine, in the following concentrations:
- Hyaluronic acid in a concentration of approximately 0.417 mg / mL.
- the aqueous nanoparticle suspension comprising chitosan and chondroitin sulfate has a pH between 4.0 and 6.0, more preferably about 5.0.
- the aqueous nanoparticle suspension comprising chitosan and hyaluronic acid has a pH between 4.0 and 6.0 more preferably about 5.0.
- the aqueous nanoparticle suspension comprising chitosan, chondroitin sulfate and hyaluronic acid has a pH between 4.0 and 6.0 more preferably about 5.0.
- the invention further provides an implant for human or animal use comprising a material according to the invention and one or more physiologically acceptable excipients, adjuvants or vehicles.
- the implant of the invention can be molded to meet the specific requirements of the patient to be treated.
- the implant according to the invention can be compressed to increase its density. Compression can be achieved by a press or appropriate devices to achieve the desired degree of compression or thickness.
- implants comprising multiple layers of the material according to the invention can be provided, which can be formed by superimposing a series of layers of compressed material.
- the invention also provides a method for promoting the regeneration of wounds or ulcers in humans or animals, which comprises applying the material of the invention or an implant on the wound bed one or more times, and optionally protecting the solid material or the implant. which includes the same.
- the material of the invention does not need to be removed from the wound bed since, after its application, it adheres quickly integrating with the tissue.
- the invention furthermore relates to a medical device or medical kit comprising the material of the invention, together with an instruction manual for use or application.
- a medical device or medical kit comprising the material of the invention, together with an instruction manual for use or application.
- Example 1 Preparation and characterization of the material.
- Table I Amounts of chitosan and chondroitin sulfate incorporated for the formation of the nanoparticulate suspension.
- nanoparticulate suspension according to sample 4 is frozen at a temperature of -20 ° C using a freezer for 12 hours.
- step b) Lyophilization
- the frozen composition according to step b) comprising nanoparticles is lyophilized so as to obtain the material under the following conditions: condenser temperature -50 / - 60 ° C, vacuum 0.02 / 0.06 mbar, lyophilization time for 20 samples -60 h.
- Figure 3 shows the physical appearance of the lyophilized material (sample 4) where it can be seen that the material has a spongy and uniform structure; It can also be seen that, despite its very low mass content (approximately 20 mg), a structure of an easily manipulated size (approximately 2.5 cm in diameter and approximately 1 cm high) is formed.
- Figure 4 provides an image that represents the microstructure of the solid material, where it is observed that it is formed by fibrillar elements that give rise to a three-dimensional mesh in which pores of heterogeneous size can be seen.
- a nanoparticulate suspension is prepared according to Example 1, sample 4. 1,200 of said nanoparticulate suspension are taken and poured onto a 96-well Elisa plate, which is lyophilized so as to obtain a solid material of suitable size (0, 6 cm in diameter) to be deposited for 5 days in 24-well culture plates containing human fibroblasts (20,000 cells per well) and an endothelial cell line (EA.h and 926, 20,000 cells per well).
- the solid material has been evaluated, in vitro, in its ability to maintain adequate growth of fibroblasts (see figure 6a) and endothelial cells (see figure 6b). In both figures it can be seen that the material allows a growth profile comparable to that corresponding to cell growth in the monolayer (control) that corresponds to a control Positive highly effective standard. This result demonstrates that the material is not toxic and that it facilitates proliferation in a manner comparable or equal to the corresponding control (monolayer).
- Example 3 Evaluation of wound closure after application of the solid material in a model of open surgical wounds in rabbits.
- a material is made according to sample 4 of Example 1.
- the animal model used in this case rabbit, full thickness open wounds were made of back skin, resulting in a circular wound of 1.5 cm in diameter .
- the solid material was applied to the wound bed of the left hemidorso (7 A, B) and the closure was compared without the application of the solid material in the right hemidorso (7A and C).
- Example 4 Histopathological analysis in an open wound model in rabbits after application of the solid material.
- a material is made according to sample 4 of Example 1.
- animal model corresponding to rabbit
- Example 5 Evaluation of the ability of the solid material to induce the closure of ulcers of the lower extremities in diabetic patients.
- a material is made according to sample 1 of Example 1.
- the solid material is placed on the wound, previously disinfected following standard clinical protocols. After application, the wound is covered with dressings commonly used in the advanced wound healing protocol according to the standard procedure for chronic ulcer healing.
- Figure 9a shows the appearance of the wound before starting treatment
- Figure 9b shows the appearance of the wound after it is finished.
- the wound closes completely after 32 days of treatment.
- crosslinking agents that are usually used in the state of the art is not required to increase the interaction between the components and form stable systems.
- the technique used avoids the need for these agents and takes advantage of the presence of the numerous functional groups with negative charge of chondroitin sulfate and hyaluronic acid, which justifies their high ionic affinity for the positive groups of chitosan favoring the formation of stable nanoparticles.
- This technical advantage simplifies its development and reduces the need for other auxiliary excipients that may compromise the safety of the vehicle and / or that of the patient.
- understand and variations such as “understand” and “understanding,” will be understood to imply the inclusion of a characteristic or stage found or groups of characteristics or stages, but not the exclusion of any other characteristic or stage or group of characteristics or stages.
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- Oral & Maxillofacial Surgery (AREA)
- Transplantation (AREA)
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Abstract
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PCT/CL2012/000023 WO2013166616A1 (es) | 2012-05-11 | 2012-05-11 | Biomaterial que comprende quitosano y al menos glicosaminoglicano |
MX2014013651A MX2014013651A (es) | 2012-05-11 | 2012-05-11 | Biomaterial que comprende quitosano y al menos un glicosaminoglicano. |
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PCT/CL2012/000023 WO2013166616A1 (es) | 2012-05-11 | 2012-05-11 | Biomaterial que comprende quitosano y al menos glicosaminoglicano |
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WO2013166616A1 true WO2013166616A1 (es) | 2013-11-14 |
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WO (1) | WO2013166616A1 (es) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0296078A1 (fr) * | 1987-06-15 | 1988-12-21 | Centre National De La Recherche Scientifique (Cnrs) | Nouveaux biomatériaux à base de mélanges de collagène, de chitosan et de glycosaminoglycanes, leur procédé de préparation ainsi que leurs applications en médecine humaine |
US5093319A (en) | 1989-10-31 | 1992-03-03 | Pfizer Hospital Products Group, Inc. | Use of derivatives of chitin soluble in aqueous solutions for preventing adhesions |
WO1999047186A1 (en) * | 1998-03-18 | 1999-09-23 | University Of Pittsburgh | Chitosan-based composite materials containing glycosaminoglycan for cartilage repair |
WO2007011416A2 (en) | 2004-11-23 | 2007-01-25 | Interdigital Technology Corporation | Method and system for securing wireless communications |
WO2007135164A1 (en) * | 2006-05-24 | 2007-11-29 | Advanced In Vitro Cell Technologies, S.A. | Nanoparticles of chitosan and hyaluronan for the administration of active molecules |
US20090068250A1 (en) | 2007-09-07 | 2009-03-12 | Philippe Gravagna | Bioresorbable and biocompatible compounds for surgical use |
-
2012
- 2012-05-11 MX MX2014013651A patent/MX2014013651A/es unknown
- 2012-05-11 WO PCT/CL2012/000023 patent/WO2013166616A1/es active Application Filing
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0296078A1 (fr) * | 1987-06-15 | 1988-12-21 | Centre National De La Recherche Scientifique (Cnrs) | Nouveaux biomatériaux à base de mélanges de collagène, de chitosan et de glycosaminoglycanes, leur procédé de préparation ainsi que leurs applications en médecine humaine |
US5093319A (en) | 1989-10-31 | 1992-03-03 | Pfizer Hospital Products Group, Inc. | Use of derivatives of chitin soluble in aqueous solutions for preventing adhesions |
WO1999047186A1 (en) * | 1998-03-18 | 1999-09-23 | University Of Pittsburgh | Chitosan-based composite materials containing glycosaminoglycan for cartilage repair |
WO2007011416A2 (en) | 2004-11-23 | 2007-01-25 | Interdigital Technology Corporation | Method and system for securing wireless communications |
WO2007135164A1 (en) * | 2006-05-24 | 2007-11-29 | Advanced In Vitro Cell Technologies, S.A. | Nanoparticles of chitosan and hyaluronan for the administration of active molecules |
US20090068250A1 (en) | 2007-09-07 | 2009-03-12 | Philippe Gravagna | Bioresorbable and biocompatible compounds for surgical use |
WO2009031047A2 (en) * | 2007-09-07 | 2009-03-12 | Sofradim Production | Bioresorbable and biocompatible compounds for surgical use |
Non-Patent Citations (4)
Title |
---|
ABDELWAHED W ET AL: "Freeze-drying of nanoparticles: Formulation, process and storage considerations", ADVANCED DRUG DELIVERY REVIEWS, ELSEVIER BV, AMSTERDAM, NL, vol. 58, no. 15, 30 December 2006 (2006-12-30), pages 1688 - 1713, XP024892085, ISSN: 0169-409X, [retrieved on 20061230], DOI: 10.1016/J.ADDR.2006.09.017 * |
CELL, vol. 64, no. 4, 1991, pages 841 - 8 |
LIN Y C ET AL: "Synthesis and characterization of collagen/hyaluronan/chitosan composite sponges for potential biomedical applications", ACTA BIOMATERIALIA, ELSEVIER, AMSTERDAM, NL, vol. 5, no. 7, 1 September 2009 (2009-09-01), pages 2591 - 2600, XP026500023, ISSN: 1742-7061, [retrieved on 20090402], DOI: 10.1016/J.ACTBIO.2009.03.038 * |
SCIENCE, vol. 252, no. 5013, 1991, pages 1705 - 8 |
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