摘要:
Bone matrix compositions having nanoscale textured surfaces and methods for their production are provided. In some embodiments, bone matrix is prepared for implantation and retains nanoscale textured surfaces. In other embodiments, nanostructures are imparted to bone matrix wherein collagen fibrils on the surface of the bone matrix have been compromised, thus imparting a nanoscale textured surface to the bone matrix. Generally, these methods may be applied to mineralized or demineralized bone including partially or surface demineralized bone.
摘要:
The use of autogenous bone graft is the current gold standard in the 1.5 million bone-grafting surgeries performed annually in the United States. Although this practice has resulted in high rates of fusion success, it is associated with increased operative time and blood loss, along with a significant degree of donor-site morbidity. Additionally, in certain settings such as revision cases, multilevel constructs, or in patients with medical comorbidities, autogenous bone graft may exist in limited quantity and quality. This significant need for a suitable alternative to autogenous bone graft has stimulated great interest in the exploration of bone graft substitutes and extenders.
摘要:
In one embodiment, the method comprises providing tissue, preparing the tissue, and treating the tissue to improve remodeling characteristics of the tissue. The tissue may be, for example, cortical bone. Treating the tissue to improve remodeling characteristics may comprise heating the tissue, treating the tissue with a chemical, or other. Heating the tissue may be done in the absence of oxygen and may comprise heating the tissue in a vacuum, heating the tissue in an inert atmosphere, heating the tissue in a reducing atmosphere, coating the tissue with a protective coating and heating the tissue, or other. Further embodiments comprise treating the tissue in supercritical fluids, for example, to dry or virally inactivate the tissue.
摘要:
The present invention provides a hemostatic bone graft product and method. Hemostatic bone grafts may include demineralized bone matrix in combination with additives. In one embodiment, the graft comprises demineralized bone and polyethylene glycol. Methods for producing the hemostatic bone graft may include mixing demineralized bone with additives to facilitate protein precipitation, surface tension reduction in blood, and/or a cytolytic effect on cells at a bleeding site.
摘要:
Bone matrix compositions and, more specifically, demineralized bone matrix (DBM) having increased osteoinductive capacity and methods for its production are provided. Specifically, DBM derived from cortical bone from the periosteal layer of bone are provided. Compositions comprising a disproportionate amount of DBM prepared from bone derived from the periosteal and/or middle layer of bone are provided. Preparations of and methods of use of periosteal DBM compositions are disclosed.
摘要:
The present invention provides methods of improving the osteogenic and/or chondrogenic activity of a bone matrix, e.g., a dermineralized bone matrix (DBM), by exposing the bone matrix to one or more treatments or conditions. In preferred embodiments the bone matrix is derived from human bone. The treatment or condition may alter the structure of the bone matrix and/or cleave one or more specific proteins. Cleavage may generate peptides or protein fragments that have osteoinductive, osteogenic, or chondrogenic activity. Preferred treatments include collagenase and various other proteases. The invention further provides improved bone and cartilage matrix compositions that have been prepared according to the inventive methods and methods of treatment using the compositions. The invention further provides methods of preparing, testing, and using the improved bone matrix compositions. On a assay comprises exposing relatively undifferentiated mesenchymal cells to a bone matrix composition and measuring expression of a marker characteristic of osteoblast or chondrocyte lineage(s). Increased expression of the marker relative to the level of the marker in cells that have been exposed to a control matrix (e.g., an inactivated or untreated matrix) indicates that the treatment or condition increased the osteogenic and/or chondrogenic activity of the bone matrix. Suitable cells include C2C12 cells. A suitable marker is alkaline phosphatase. The inventive methods increase the osteogenic and/or chondrogenic activity of human DBM when tested using this assay system.
摘要:
A covering for delivering a substance or material to a surgical site is provided. The covering, with substance provided therein, may be referred to as a delivery system. Generally, the covering may be a single or multi-compartment structure capable of at least partially retaining a substance provided therein until the covering is placed at a surgical site. Upon placement, the covering may facilitate transfer of the substance or surrounding materials. For example, the substance may be released (actively or passively) to the surgical site. The covering may participate in, control, or otherwise adjust the release of the substance. In various embodiments, the covering is suitable for a variety of procedure specific uses. Implantation tools may be provided for placing the covering at a surgical site. Kits may be provided including variously sized or shaped coverings and one or more tools for use in placing the covering.
摘要:
Bone matrix compositions and, more specifically, demineralized bone matrix (DBM) having increased osteoinductive capacity and methods for its production are provided. Specifically, DBM derived from cortical bone from the periosteal layer of bone are provided. Compositions comprising a disproportionate amount of DBM prepared from bone derived from the periosteal and/or middle layer of bone are provided. Preparations of and methods of use of periosteal DBM compositions are disclosed.
摘要:
A cyclized peptide designated BMP Binding Peptide (BBP) is a synthetic peptide that avidly binds rhBMP-2. BBP increases the over-all osteogenic activity of rgBMP-2, increases the rate at which rhBMP-2 induces bone formation, and BBP induces calcification alone. Compositions and substrates including BBP, and methods of using BBP are useful in therapeutic, diagnostic and clinical applications requiring calcification and osteogenesis.
摘要:
An osteoinductive composition, corresponding osteoimplants, and methods for making the osteoinductive composition are disclosed. The osteoinductive composition comprises osteoinductive factors, such as may be extracted from demineralized bone, and a carrier. The osteoinductive composition is prepared by providing demineralized bone, extracting osteoinductive factors from the demineralized bone, and adding the extracted osteoinductive factors to a carrier. Further additives such as bioactive agents may be added to the osteoinductive composition. The carrier and osteoinductive factors may form an osteogenic osteoimplant. The osteoimplant, when implanted in a mammalian body, can induce at the locus of the implant the full developmental cascade of endochondral bone formation including vascularization, mineralization, and bone marrow differentiation. Also, in some embodiments, the osteoinductive composition can be used as a delivery device to administer bioactive agents.