• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    abstract fabric product; method for producing a fabric composition; And method for treating a fabric spot is fabric fills. Tissue fillers may include a plurality of tissue particles formed from acellular tissue matrix fragments. Fabric fillers can be used to fill fabric locations, such as voids formed after tissue resection.
    公开号:BR112014014975B1
    申请号:R112014014975-5
    申请日:2012-12-18
    公开日:2019-06-25
    发明作者:Mark Hayzlett；Ivis Munoz；Nimesh Kabaria；Joshua Czeczuga
    申请人:Lifecell Corporation；
    IPC主号:
    专利说明:

    A method of producing a fabric composition
    [001] This application claims priority under 35 U.S.C. § 119 of Provisional Application No. U.S. 61 / 577,729, which was filed on December 20, 2011.
    The present disclosure relates to fabric products and more particularly to fabric particulate products for use as fabric fills.
    Various fabric products have been produced to replace, augment, or treat tissue defects. For example, to replace or augment soft tissue defects, particulate acellular dermal matrices that form a paste-like or mass-like material may be used. Such products include, for example, CYMETRA®, which is a dermal acellular tissue matrix available from LIFECELL® Corporation (Branchburg, NJ).
    While suitable for certain applications, further improvements in the ability of fabric products for soft or hard tissue treatment are desirable. The present disclosure discloses improved tissue products produced from particulate matrices of tissue.
    SUMMARY
    [005] According to certain embodiments, a fabric product is provided. The product may include a plurality of dry fabric matrix particles comprising a widest dimension between about 1 mm and 5 mm. The tissue matrix particles may each comprise a plurality of tissue matrix fragments having a length between about 5 pm to 300 pm, wherein the tissue matrix fragments are formed into tissue matrix particles.
    According to certain embodiments, a method for producing a tissue treatment composition is provided. The method may include selecting a tissue matrix and treating the tissue matrix to produce fragments having a length between about 5 pm and 300 pm. The method may further comprise transforming the fragments into a plurality of particles having a widest dimension between about 1 mm and about 5 mm; and treating the particles to join the fragments together, forming each particle. In some embodiments, the present disclosure includes fabric products produced according to disclosed methods.
    According to certain embodiments, a method of treating a tissue site is provided. The method may comprise selecting a tissue site and selecting a tissue product which comprises a plurality of dry tissue particles, wherein each of the tissue matrix particles comprises a plurality of tissue matrix fragments having a length between about 5 pm and 300 pm, and wherein the tissue matrix fragments are joined together to form the tissue matrix particles. The method may further comprise placing the plurality of tissue particles in or on the tissue site.
    According to certain embodiments, a fabric product is provided. The tissue product may include a plurality of dry tissue matrix particles which forms a fluidizable mass which may be spread on a tissue site and will flow to fill and conform to a tissue site. The particles are substantially spherical and have a radius between approximately 1 mm and 5 mm. Each of the tissue matrix particles comprises a plurality of tissue matrix fragments having a length between about 5 pm to 300 pm, and the fragments are joined together to form the tissue matrix particles.
    DESCRIPTION OF THE DRAWINGS
    Figure 1 shows a process for producing a fabric product according to various embodiments.
    DESCRIPTION OF CERTAIN EXEMPLIFYING MODALITIES
    [010] Reference will now be made in detail to certain exemplary embodiments in accordance with the present disclosure, examples of which will be illustrated in the accompanying drawings. Whenever possible, the same reference numerals will be used throughout the drawings to refer to like or like parts.
    [011] In this application, the singular use includes the plural unless specifically stated otherwise. In this application, the use of "or" means "and / or" unless otherwise stated. In addition, the use of the term "including" as well as other forms such as "includes" and "included" is not limiting. Any range described in this document will be understood to include endpoints and all values between endpoints.
    [012] The section headings used in this document are for organizational purposes only and should not be construed as limiting the subject matter described.
    All documents or portions of documents cited in this application include, but are not limited to, patents, patent applications, articles, books and research, and are hereby expressly incorporated in their entirety by reference for any purpose.
    As used herein, "tissue product" will refer to any human or animal tissue that contains extracellular matrix proteins. "Tissue products" may include intact tissue matrices, acellular or partially deeliorated tissue matrices, de-gelled tissue matrices that have been repopulated with exogenous cells and / or cellular tissues that have been processed to change the orientation of at least some of the fibers of collagen within the extracellular matrix of tissue.
    [014] Various fabric products are available for treatment of hard and soft tissues. Such fabric products may include processed fabrics which have been treated to remove some or all of the components and / or other cellular materials (for example, antigens and lipids). Such fabric products may be used for treatment, repair, regeneration and / or augmentation of a variety of different tissues. For example, acellular tissue matrices may be used to replace lost or damaged soft tissue due to, for example, surgery, trauma, disease, and / or atrophy.
    [015] Current fabric matrices or other fabric scaffolds or replacement materials (e.g., processed collagen or synthetic materials) are available in a variety of different forms. For example, STRATTICE ™ and ALLODERM® (LIFECELL® Corporation, Branchburg, NJ) are two dermal acellular matrices that are sold as sheets. In addition, CYMETRA® (also from LIFECELL®) is the particulate dry acellular dermal matrix, which is produced by the cryopreservation of acellular dermis. Each of these materials can be used to treat various anatomical sites. STRATTICE ™ and ALLODERM® may be used for soft tissue augmentation, for example, to treat abdominal wall defects; and CYMETRA® can be injected for soft tissue augmentation.
    Although some currently available matrices of tissue are suitable for treatment of certain anatomical sites, such materials may not be well suited for some applications. For example, in treating tissue defects of varying size and geometry, for example, after surgical excision of diseased tissue, sheets may not be well suited to allow complete filling of a tissue site. In addition, particulate materials may be accumulated or placed in a tissue site (e.g., in the form of a paste or mass), but such materials may not flow adequately to fill small defects, and may not maintain sufficient porosity or space for rapid cell infiltration and formation of vascular structures. Accordingly, the present disclosure provides fabric products which may be used to fill fabric defects having varying and / or irregular geometries. In addition, the tissue products of the present disclosure may provide suitable configurations for allowing cellular ingrowth and vascular formation.
    [017] In various embodiments, a fabric product is provided. The fabric product may include a plurality of dry fabric matrix particles. The particles may be formed from fragments of tissue that are bonded together to produce the desired particle size and shape. In various embodiments, the particles comprise a longest possible dimension between about 1 mm and 5 mm and the tissue matrix fragments forming the particles comprise a length between about 5 pm and 300 pm.
    In various embodiments, a method for producing a tissue treatment composition is provided. The method may include selecting a tissue matrix and treating the tissue matrix to produce fragments having a length between about 5 pm and 300 pm. The method may further comprise forming the fragments into a plurality of particles having a longest possible dimension between about 1 mm and about 5 mm.
    [019] In various embodiments, methods for treating a tissue site are provided. The methods may comprise selecting a tissue site and selecting a tissue product comprising a plurality of dry tissue particles, wherein each of the tissue matrix particles comprises a plurality of tissue matrix fragments having a length between about 5 pm to 300 pm, and wherein the tissue matrix fragments are joined together to form the tissue matrix particles; and placing the plurality of tissue particles in or at the tissue site.
    [020] In various embodiments, a fabric product is provided. The tissue product may comprise a plurality of dry tissue matrix particles which forms a fluidizable mass which may be spread on a tissue site and will flow to fill and conform to the tissue site. The particles are substantially spherical and have a radius between approximately 1 mm and 5 mm. Each of the tissue matrix particles comprises a plurality of tissue matrix fragments having a length between about 5 pm to 300 pm, wherein the tissue matrix fragments are joined to one another to form the tissue matrix particles .
    [021] In certain embodiments, the fabric products produced, as described herein, provide improved properties when implanted or during storage. For example, the products described herein may be less susceptible to damage during freezing than other acellular fabric matrices. In addition, matrices may have an improved ability to allow cellular ingress and vascularization.
    Figure 1 shows a process for producing a fabric product according to various embodiments. As shown in step 101, the process begins with the selection of a tissue matrix 100. Suitable tissue matrices are discussed further below, but the tissue matrices may include any substantially acellular tissue matrix produced from human or animal tissue, which retain the ability to sustain cellular ingrowth and regeneration of tissue without excessive inflammation. Certain exemplary tissue matrices that may be used include STRATTICE ™ and ALLODERM® (LIFECELL® Corporation, Branchburg, NJ), which are a porcine and a human acellular dermal matrix, respectively. However, other suitable tissue matrices may be used, which includes, for example, small intestine submucosa. In addition, tissue matrices may include intact (undeluted) tissues and / or tissues that have been particularly de-gelled and / or populated with exogenous cells.
    [023] Next, as shown in step 111, the matrix 100 is processed to produce fragments 110. The fabric fragments 110 may be formed using a range of sizes and different morphologies. For example, in some embodiments, the tissue fragments 110 are in the form of small filaments or tissue matrix fibers that have been treated to produce a size and / or shape distribution. In various embodiments, the filaments or fibers have a length of between about 5 Âμm and 300 Âμm, between about 50 Âμm and 200 Âμm, between about 50 Âμm and 300 Âμm, or any values therebetween. In certain embodiments, the filaments are from about 40 microns X 140 microns to 100 microns per 350 microns.
    [024] Tissue fragments 110 may be produced using a variety of methods. For example, any cutting, grinding, milling, mixing, shearing, or other mechanical process can be used as long as it produces the desired size and shape and does not cause inappropriate damage or change to the fabric matrix. In certain embodiments, the tissue fragments 110 are processed using a mill such as a SYMPAK® food mill or a QUADRO Atritor Mill (Quadro, Canada). In some embodiments, the fabric matrix 100 is cut into small pieces (for example, 4 cm x 4 cm) and then milled. In addition, the matrix may be mixed briefly in a solution (for example, PBS) prior to milling.
    [025] In some cases, fabric matrices 100 may be processed to produce the fragments 110 when wetted or submerged in a liquid. For example, fabric matrices 100 may be milled or otherwise processed when submerged in a buffer such as PBS or any other suitable buffer. Further, upon processing, the plug may be at least partially removed by centrifuging or filtering to remove part or all of the liquid component. For example, a suitable centrifugation protocol may include centrifuging at 4,500 rpm for about 60 minutes.
    After processing to produce tissue fragments 110, groups of fragments 120 are formed to produce particles 120 having a desired shape as shown in Step 121. The specific shapes and sizes of the particles 120 may be varied based on the intended location of implantation, to control the particle space to provide channels for cellular and vascular ingress, or to control the ability of the particles to flow into a desired site of treatment. The tissue particles 120 may be formed using a variety of molding or forming processes. For example, fragments 110 may be placed in a mold and / or tablet, wound in a desired shape, or otherwise manually handled to produce the desired shape.
    [027] In some embodiments, the particles may be formed by immersion in a cold liquid. For example, fragments containing a buffer, such as PBS, can be extruded from a syringe and slowly released into liquid nitrogen. The material when released in liquid nitrogen will form small particles, and the relative dimensions of the particles can be controlled by controlling the extrusion speed and water content of the materials.
    [028] In some cases, after extrusion, the materials may be further processed to produce a desired shape and / or structure. For example, in some cases, the frozen materials are placed in a mixing device, such as a turner. A revolver is a cooking attachment of a mixer, which acts as a stone drum or cement mixer; it rotates at a given speed and turns any objects inside to achieve a coating of any powder or liquid that is added. However, other similar mixing devices may be used. After placement into the mixing device, additional dry filaments, produced as discussed above, may be added to the mixing device (for example at about a 1: 1 ratio of dry particles and filaments). Materials with or without additional dry filaments may be processed in the turner or similar mixing device to produce a more spherical shape, and / or to change the size of the particles. Optionally, the particles may be at least partially dried while in the revolver. For example, the particles frozen in the mixing device may be exposed to low levels of hot air (for example, at approximately 48Â ° C at a rate which does not blow the particles out of the processing device). As the particles in the mixing device are slowly heated and dried, fabric fragments in the form of dry powder may be added to keep the coated particles. Adding dry powder in this way can help in pulling residual moisture to the surface of the particles to dry the interior. Optionally, the particles may be further dried within the mixing device to remove more moisture.
    A variety of formats may be used for the tissue particles 120. For example, the tissue particles 120 may be formed in substantially spherical or oblong shapes (e.g., ovoid), in cubes, rectangles, tubes, pyramids, or in any other desired format. In some embodiments, the shape is selected to control fluidity when implanted. For example, spherical shapes can be selected to allow a high degree of fluidity. Alternatively, more oblong shapes can be selected to allow filling of a space while avoiding migration out of a desired location. In addition, the specific shape can be selected to control the space between the particles. For example, a spherical shape and size may be selected to produce a certain amount of porosity to allow cellular ingrowth and / or formation of vascular or extracellular structures.
    [030] Furthermore, the particle size can be varied based on the desired application. For example, the particles may have a larger dimension between about 1 mm and about 5 mm. Therefore, if the particles are spherical, the particles will have a diameter between approximately 1 mm and 5 mm, and if the particles are ovoid, the particles will have a long axis of length between about 1 mm and 5 mm.
    In various embodiments, the particles are processed so that the fragments constituting the particles are bonded together to form stable structures, as shown in Step 131. In certain embodiments, the fragments are joined together without the use of substantial amounts of binder or adhesives. In addition, in some embodiments, the fragments are dried using a process believed to bind the fragments without significant cross-linking. For example, in some cases, the fragments may have fissured ends engaging one another. In addition, in some embodiments, the fragments may bind to each other by non-covalent attachment. As discussed elsewhere, the particles may be dried using a process such as convective drying, and such processes may produce particles having fragments which are attached to each other.
    In some embodiments, the fragments are joined to each other by cross-linking. Crosslinking can be achieved by the use of a number of processes such as dehydrothermal crosslinking, exposure to UV light, and / or chemical crosslinking. In some embodiments, a dehydrothermal crosslinking process is used to allow crosslinking while simultaneously drying the particles. Furthermore, with the use of any of the crosslinking processes, the particles may be further dried (for example by freeze drying or air drying) to remove additional moisture.
    In various embodiments, tissue products may be selected to have certain properties that facilitate tissue implantation and filling and / or regeneration. For example, in certain embodiments, the tissue particles are dried prior to implantation. The dried particles may form a fluidizable mass which will fill a void or pocket in a tissue site. The tissue particles may be dried by freeze drying and / or concomitantly with a dehydrothermal crosslinking process. In addition, the particles may be selected so that they swell when in contact with an aqueous environment, as it may be present in a tissue site. Thus, the particles may expand when implanted to fill a selected tissue site.
    [034] In some embodiments, the particles are dried by convective heating. For example, frozen particles may be placed in a convective drier (for example, HARVEST Brand Kitchen Convection Dryer). The drying can be performed at approximately 45 ° C. However, lower or higher temperatures may be used provided that temperatures causing unacceptable denaturation or other tissue damage are not used. In addition, it should be noted that, even when partially or mostly dry as described above, with the use of a revolver, the particles may be further dried to remove excess moisture.
    After drying, the particles are packaged and sterilized to form an end product 140, as shown in Step 141. The product may be packaged in a variety of known medical receptors and may be sterilized by the use of conventional procedures, provided these processes do not damage the product (for example, by excessive crosslinking) in an unacceptable manner. In some embodiments, the product may be packed in bags with leaf-to-sheet separation and irradiated. In some embodiments, the product may be irradiated with electron beam radiation. Suitable doses of electron beams may include a range of 15 to 22 kGy or bands therein.
    The fabric products of the present disclosure may be used to treat a variety of different soft tissue or hard tissue sites. For example, the products may be used to replace, repair, regenerate or augment lost or destroyed tissue due to surgery, trauma and / or any pathological process. In some embodiments, the tissue products may be implanted in a soft tissue site as a lumpectomy site. In other embodiments, the products may be used to treat or increase bone, muscle, and subcutaneous tissue and / or adipose tissue.
    [037] In certain embodiments, a negative internal pressure may be applied within the fabric product. In certain embodiments, a negative pressure may serve to attract cells from surrounding tissue to the implanted acellular tissue product, which increases the rate at which native cells migrate into the tissue product and accentuate the overall speed and / or efficacy of tissue approach.
    In certain exemplary embodiments, an internal negative pressure is delivered to the acellular tissue matrix by a reduced pressure therapy device. The reduced pressure therapy device may include a pump fluidly connected, for example through a fluid passage or tubing, to the acellular tissue matrix, and which delivers reduced or negative pressure to the acellular tissue matrix. A variety of reduced pressure therapy devices may be used. For example, suitable reduced pressure therapy devices include V.A.C.® therapy devices produced by KCI (San Antonio, Texas).
    CELL FABRIC MATRICES
    The term "acellular tissue matrix" as used herein refers generally to any tissue matrix which is substantially free of cells and / or cellular components. Skin, parts of skin (e.g., dermis) and other tissues, such as blood vessels, heart valves, fascia, cartilage, bone and connective tissue of the nerve, may be used to create acellular matrices within the scope of the present disclosure. Acellular tissue matrices may be tested or evaluated to determine if they are substantially free of cell and / or cellular components in a variety of ways. For example, processed tissues can be inspected under optical microscopy to determine whether cells (live or dead) and / or cellular components are present. In addition, certain assays can be used to identify the presence of cells or cellular components. For example, assays of DNA or other nucleic acid can be used to quantify remaining nuclear materials within the tissue matrices. Generally, the absence of DNA or other nucleic acids will be indicative of complete de-gelation (i.e., removal of cells and / or cellular components). Finally, further assays that identify specific components per cell (e.g., surface antigens) can be used to determine if the tissue matrices are acellular.
    In general, the steps involved in producing an acellular tissue matrix include collecting tissue from a donor (e.g., a human cadaver or animal source) and removing cells under conditions that preserve biological function and function structural. In certain embodiments, the process includes a chemical treatment to stabilize the tissue and prevent biochemical structural degradation along with, or prior to, removal of the cell. In various embodiments, the stabilizing solution deters and prevents osmotic, hypoxic, autolytic and proteolytic degradation, protects against microbial contamination and reduces mechanical damage that may occur with tissues containing, for example, smooth muscle components (e.g., blood vessels). The stabilizing solution may contain an appropriate buffer, one or more antioxidants, one or more oncotic agents, one or more antibiotics, one or more protease inhibitors, and / or one or more smooth muscle relaxants.
    The tissue is then placed in a de-gelation solution to remove viable cells (e.g., epithelial cells, endothelial cells, smooth muscle cells and fibroblasts) from the structural matrix, without damaging the biological and structural integrity of the template matrix. collagen. The de-gelation solution may contain an appropriate buffer, salt, an antibiotic, one or more detergents (for example TRITON X-100 ™, sodium deoxycholate, polyoxyethylene (20) sorbitan monooleate), one or more agents to prevent cross- one or more protease inhibitors and / or one or more enzymes. In some embodiments, the de-gelation solution comprises 1% TRITON X-100 ™ in RPMI medium with Gentamicin and 25 mM EDTA (ethylenediaminetetraacetic acid). In some embodiments, the tissue is incubated in the de-gelation solution overnight at 37 ° C with gentle shaking at 90 rpm. In certain embodiments, additional detergents may be used to remove fat from the tissue sample. For example, in some embodiments, 2% sodium deoxycholate is added to the de-gelation solution.
    [042] After the de-gelation process, the tissue sample is thoroughly washed with saline. In some exemplary embodiments, for example, when xenogenic material is used, the de-gelled tissue is then treated overnight at room temperature with a deoxyribonuclease (DNase) solution. In some embodiments, the tissue sample is treated with a DNase solution prepared in DNase buffer (20 mM HEPES (4- (2-hydroxyethyl) -1-piperazineethanesulfonic acid), 20 mM CaCl 2 and 20 mM MgCl 2). Optionally, an antibiotic solution (for example, Gentamycin) may be added to the DNase solution. Any suitable buffer may be used provided the buffer provides adequate DNase activity.
    [043] Although an acellular tissue matrix can be made from one or more individuals of the same species as the acellular tissue matrix graft receptor, this is not necessarily the case. Thus, for example, an acellular tissue matrix may be made from swine tissue and implanted in a human patient. Species which may serve as acellular tissue matrix receptors and as donors of tissues or organs for the production of the acellular tissue matrix include, without limitation, mammals, such as humans, non-human primates (e.g., monkeys, baboons or chimpanzees), pigs, cows, horses, goats, sheep, dogs, cats, rabbits, guinea pigs, gerbils, hamsters, rats or mice.
    [044] Removal of α-gal epitopes from collagen-containing material may decrease the immune response against the collagen-containing material. The a-gal epitope is demonstrated in non-primate mammals and New World monkeys (South American monkeys) as well as in macromolecules as proteoglycans of extracellular components. U. Galili et al., J. Biol. Chem. 263: 17755 (1988). This epitope is absent in Old World primates (Asian and African apes and hominoids) and in humans, however. Id. Anti-gal antibodies are produced in humans and primates as a result of an immune response to α-gal epitope carbohydrate structures or gastrointestinal bacteria. U. Galili et al., Infect. Immun. 56: 1730 (1988); R. M. Hamadeh et al. , J. Clin. Invest. 89: 2223 (1992).
    Since non-primate mammals (e.g., pigs) produce α-gal epitopes, the xenotransplantation of collagen-containing material from such mammals to primates commonly results in rejection in primates because of the anti-Gal binding to such epitopes in collagen-containing material. The binding results in the destruction of the collagen-containing material by complement fixation and by antibody-mediated cytotoxicity. U. Galili et al., Immunology Today 14: 480 (1993); M. Sandrin et al. , Proc. Natl. Acad. Know. USA 90: 11391 (1993); H. Good et al. , Transplant. Proc. 24: 559 (1992); B. H. Collins et al. , J. Immunol. 154: 5500 (1995). In addition, xenotransplantation results in strong activation of the immune system to produce increased amounts of high affinity anti-gal antibodies. Accordingly, in some embodiments, when animals producing α-gal epitopes are used as the tissue source, substantial elimination of α-gal epitopes from cells and from extracellular components of the collagen-containing material, and prevention of resexpression of cellular α-gal epitopes may decrease the immune response against the collagen-containing material associated with the anti-gal antibody which binds to α-gal epitopes.
    [046] To remove α-gal epitopes, after washing the tissue completely with saline to remove the DNase solution, the tissue sample may undergo one or more enzymatic treatments to remove certain immunogenic antigens, if present in the sample. In some embodiments, the tissue sample may be treated with an α-galactosidase enzyme to eliminate α-gal epitopes, if present in the tissue. In some embodiments, the tissue sample is treated with α-galactosidase at a concentration of 300 U / L prepared in a 100 mM phosphate buffer at pH 6.0. In other embodiments, the α-galactosidase concentration is increased to 400 U / L for adequate removal of α-gal epitopes from the collected tissue. Any suitable enzyme concentration and buffer may be used as long as sufficient removal of antigens is achieved.
    [047] Alternatively, instead of treating the tissue with enzymes, animals that have been genetically modified to lack one or more antigenic epitopes may be selected as the source of tissue. For example, animals (e.g., pigs) that have been genetically modified to lack the α-galactose terminal moiety may be selected as the source of tissue. For descriptions of suitable animals, see U.S. Serial No. 10 / 896,594 and U.S. Patent No. 6,166,288, the disclosures of which are incorporated by reference in their entirety herein by reference. In addition, certain exemplary methods of processing tissues to produce acellular matrices with or without reduced amounts or lack of alpha-1,3-galactose moieties are described in Xu, Hui. et al., "A Porcine-Derived Acellular Dermal Scaffold that Supports Soft Tissue Regeneration: Removal of Terminal Galactose-a- (1,3) -Galactose and Retention of Matrix Structure," Tissue Engineering, Volume 15, 1 to 13 (2009) ), which is incorporated in its entirety by way of reference.
    [048] After the acellular tissue matrix is formed, histocompatible viable cells may optionally be seeded in the acellular tissue matrix to produce a graft which may be further remodeled by the host. In some embodiments, histocompatible viable cells may be added to the matrices by standard in vitro cell co-culture techniques prior to transplantation, or by in vivo repopulation after transplantation. In vivo repopulation can occur by migration of the recipient's own cells into the acellular tissue matrix, or by infusion or injection of cells obtained from the recipient, or by histocompatible cells from another donor into the acellular tissue matrix in situ . Several cell types can be used, which includes embryonic stem cells, adult stem cells (eg, mesenchymal stem cells) and / or neuronal cells. In various embodiments, the cells may be directly applied to an inner portion of the acellular tissue matrix immediately before or after implantation. In certain embodiments, the cells may be placed within the acellular tissue matrix to be implanted and may be cultured prior to implantation.
    权利要求:
    Claims (26)
    [1]
    A TISSUE PRODUCT, characterized in that it comprises a plurality of dry fabric matrix particles comprising a widest dimension between about 1 mm and 5 mm, wherein each of the tissue matrix particles comprises a plurality of tissue fibers having a length between about 5 pm and 300 pm, and wherein the tissue matrix fragments are transformed into the tissue matrix particles.
    [2]
    A FABRIC PRODUCT according to claim 1, characterized in that the particulate fragments comprise binding the fragments without the use of a binder or adhesive.
    [3]
    A FABRIC PRODUCT according to one of Claims 1 or 2, characterized in that the fragments are joined by convective drying.
    [4]
    The fabric fabric according to claim 1, characterized in that the fabric fragments are cross-linked.
    [5]
    A tissue fabric according to any one of claims 1 to 4, characterized in that each of the tissue particles has a length of between about 2 mm and 3 mm.
    [6]
    TISSUE PRODUCT according to one of claims 3 or 4, characterized in that the tissue fragments are crosslinked with each other using a dehydrothermal crosslinking process.
    [7]
    TISSUE PRODUCT according to any one of claims 1 to 6, characterized in that the particles are substantially spherical.
    [8]
    A tissue fabric according to any one of claims 1 to 7, characterized in that the particles are fluidizable when dried.
    [9]
    A tissue fabric according to any one of claims 1 to 8, characterized in that the tissue fragments are elongated tissue matrix filaments.
    [10]
    A tissue fabric according to any one of claims 1 to 9, characterized in that the tissue matrix particles are a matrix of dermal tissue.
    [11]
    A tissue fabric as claimed in any one of claims 1 to 10, characterized in that the tissue matrix particles are tissue matrix swine particles.
    [12]
    A tissue fabric according to any one of claims 1 to 11, characterized in that the tissue matrix is a matrix of acellular tissue.
    [13]
    A method for producing a fabric composition comprising: selecting a fabric matrix; treating the tissue matrix to produce fragments having a length between about 5 pm and 300 pm; transforming the fragments into particles having a widest dimension between about 1 mm and about 5 mm.
    [14]
    A method according to claim 13, characterized in that it additionally comprises drying the particles to form a plurality of dry particles.
    [15]
    A method according to claim 13, characterized in that the particulate drying comprises subjecting the particles to a convective drying process.
    [16]
    A method according to any one of claims 13 to 15, further comprising treating the particles with a dehydrothermal treatment process.
    [17]
    A method according to any one of claims 13 to 16, characterized in that the fragments in a plurality of particles comprise compressing groups of the fragments.
    [18]
    A method according to any one of claims 13 to 16, characterized in that the fragments are converted into a plurality of particles including placing small groups of the fragments in a cold environment to freeze the groups.
    [19]
    A method according to claim 18, characterized in that small groups of the fragments are placed in a cold environment to freeze the groups include extruding the small groups into a cryogenic liquid.
    [20]
    A method according to any one of claims 13 to 19, characterized in that the plurality of particles include substantially spherical particles.
    [21]
    A method according to any one of claims 13 to 20, characterized in that the tissue matrix is a dermal tissue matrix.
    [22]
    A method according to any one of claims 13 to 21, characterized in that the tissue matrix is a pig tissue matrix.
    [23]
    A method according to any one of claims 13 to 22, characterized in that the tissue matrix is a matrix of acellular tissue.
    [24]
    A tissue fabric comprising a plurality of dry fabric matrix particles which forms a fluidizable mass which can be spread in a tissue site and will flow to fill and conform to the tissue site where the particles are substantially spherical and have a radius between approximately 1 mm and 5 mm, wherein each of the tissue matrix particles comprises a plurality of tissue matrix fragments having a length between about 5 pm and 300 pm, wherein the fragments of Tissue matrix are joined together to form the tissue matrix particles.
    [25]
    A tissue fabric according to claim 24, characterized in that the tissue matrix particles include matrix particles of dermal tissue.
    [26]
    A tissue fabric according to one of claims 24 or 25, characterized in that the tissue matrix particles comprise tissue matrix swine particles.
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    法律状态:
    2018-03-27| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-01-15| B06T| Formal requirements before examination [chapter 6.20 patent gazette]|
    2019-04-30| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2019-06-25| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 18/12/2012, OBSERVADAS AS CONDICOES LEGAIS. (CO) 20 (VINTE) ANOS CONTADOS A PARTIR DE 18/12/2012, OBSERVADAS AS CONDICOES LEGAIS |
    优先权:
    申请号 | 申请日 | 专利标题
    US201161577729P| true| 2011-12-20|2011-12-20|
    US61/577,729|2011-12-20|
    PCT/US2012/070250|WO2013096252A1|2011-12-20|2012-12-18|Flowable tissue products|
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