摘要:
An artificial bone promotive of osteoanagenesis comprising a calcium phosphate cement and a linear polyphosphate, wherein the calcium phosphate cement comprises &bgr;-tricalcium phosphate, monocalcium phosphate, calcium sulfate hemihydrate and other additives. The artificial bone is non-toxic to the body chemically stable, and has an excellent biodegradability. The artificial bone may be applied as substitutes for bone cements, allografts and autografts.
摘要:
Tissue engineering devices with enhanced cell adhesion, cell proliferation and directional growth are provided which are prepared from nonwoven nanofibril matrices.
摘要:
An improved ceramic bone graft is provided for human implantation, particularly such as a spinal fusion cage for implantation into the inter-vertebral space between two adjacent vertebrae. The improved spinal fusion cage includes a substrate block of high strength ceramic having a selected size and shape to fit the anatomical space, and a controlled porosity analogous to natural bone. The substrate block is coated with a bio-active surface coating material such as hydroxyapatite or a calcium phosphate to promote bone ingrowth and enhanced bone fusion. Upon implantation, the fusion cage provides a spacer element having a desired combination of mechanical strength together with osteoconductivity and osteoinductivity to promote bone ingrowth and fusion, as well as radiolucency for facilitated post-operative monitoring. The fusion cage may additionally carry one or more natural or synthetic therapeutic agents for further promoting bone ingrowth and fusion.
摘要:
An improved ceramic bone graft is provided for human implantation, particularly such as a spinal fusion cage for implantation into the inter-vertebral space between two adjacent vertebrae. The improved spinal fusion cage includes a substrate block of high strength ceramic having a selected size and shape to fit the anatomical space, and a controlled porosity analogous to natural bone. The substrate block is coated with a bio-active surface coating material such as hydroxyapatite or a calcium phosphate to promote bone ingrowth and enhanced bone fusion. Upon implantation, the fusion cage provides a spacer element having a desired combination of mechanical strength together with osteoconductivity and osteoinductivity to promote bone ingrowth and fusion, as well as radiolucency for facilitated post-operative monitoring. The fusion cage may additionally carry one or more natural or synthetic therapeutic agents for further promoting bone ingrowth and fusion.
摘要:
A method for treating a bone defect is provided by identifying a bone site suitable for receiving an implant; and introducing a strongly resorbable, poorly crystalline apatitic calcium phosphate at the implant site, whereby bone is formed at the implant site. A bone defect may be treated by identifying a bone site suitable for receiving an implant; and introducing a hydrated precursor to a strongly resorbable, poorly crystalline apatitic calcium phosphate at the implant site, whereby the hydrated precursor is converted in vivo to a poorly crystalline apatitic calcium phosphate and whereby bone is formed at the implant site. The implant site may be a variety of sites, such as a tooth socket, non-union bone, bone prosthesis, an osteoporatic bone, an intervertebral space, an alveolar ridge or a bone fracture.
摘要:
The present invention relates to hard tissue scaffolds comprising a resorbable ceramic, and their method of production. Specifically, this invention relates to novel scaffolds, formed via a replication technique, and useful as biological replacements for hard tissue.
摘要:
A surgical apparatus driver device for use with a subcombination comprising A) a tome for cutting at least one dovetail in bone comprising a shaft having first and second ends, the first end having attached thereto a blade for cutting the dovetail in the bone and the second end having attached thereto an extension for engagement with a mechanical energy transmission mechanism, and B) a guide comprising a tube having a first end and a second end, the tube being configured for acceptance of the shaft of the tome and having tangs extending from one end thereof; wherein the driver comprises a mechanism for engagement with the subcombination, a piston, and a mechanism for providing power to the piston for delivery of a multiplicity of impact to the subcombination.
摘要:
The present invention provides a novel process for converting a standard inert amorphous calcium phosphate precipitate into highly reactive amorphous solids. The amorphous solids can be used to react with other calcium phosphate solids to form a poorly-crystalline synthetic hydroxyapatite that provides both bioactivity and structural integrity. This novel amorphous material can be reacted with other calcium phosphates at or below 37° C. to form a bone-like material consisting of poorly crystalline hydroxyapatite.
摘要:
The present invention provides a synthetic, poorly-crystalline apatitic (PCA) calcium phosphate material seeded with cells. Preferably, the cells are tissue-forming or tissue-degrading cells. The compositions provided by the present invention are useful for a variety of applications, including in vivo and in vitro tissue growth (preferably bone or cartilage), osseous augmentation, and methods of diagnosing disease states by assaying tissue-forming potential of cells isolated from a host. The invention also provides in vitro cell culture systems and cell encapsulation matrices.
摘要:
A novel method is disclosed for the manufacture of live autogenous skeletal replacement parts through muscle flap molding and osteoinduction comprising the steps of:a) forming a mold of physiologically inert support material into the shape of a replacement part for a defective skeletal site,b) placing a muscle flap into the cavity of the mold,c) thoroughly incorporating osteoinductive factor in the muscle flap,d) closing the mold,e) allowing osteogenesis to take place, andf) implanting the resulting newly formed bone into the defective skeletal site.