摘要:
Provided are devices for bone tissue engineering, comprising a metal or metal-based composite member comprising an interior macroporous structure with porosity varying from 0-90% (v), the member comprising a surface region having a surface pore size, porosity, and composition designed to encourage cell growth and adhesion thereon, to provide a device engineered for a particular recipient subject. Engineered devices may further comprises a gradient of pore size, porosity, and material composition extending from the surface region throughout the interior of the device, wherein the gradient transition is continuous, discontinuous or seamless to promote cell in-growth. Additional aspects provide methods for bone tissue engineering, comprising use of a metal or metal-based composite member comprising an interior porous structure, wherein the pore size, porosity and material composition is selected to provide a device having an optimal density and/or elastic modulus and/or compression strength for a specific recipient. Fabrication methods are provided.
摘要:
Various embodiments of surface-modified devices, components, and associated methods of manufacturing are described herein. In one embodiment, an implantable device suitable for being implanted in a patient includes an implantable material having a utile shape and a surface and a modification material deposited on at least a portion of the surface of the implantable material. The modification material has a release rate in an implantation environment in the patient. The modification material at the release rate is effective as bactericidal without being cytotoxic to the patient.
摘要:
Particular aspects provide bioresorbable and biocompatible compositions for bioengineering, restoring or regenerating tissue or bone, comprising a three-dimensional porous or non-porous scaffold material comprising a calcium phosphate-based ceramic having at least one dopant therein selected from metal ion or ion dopants and metal oxide dopants, wherein the composition is sufficiently biocompatible to provide for a cell or tissue scaffold, and resorbable at a controlled resorption rate for controlled stregthloss, depending on dopant composition, under body, body fluid or simulated body fluid conditions. Preferably, the at least one dopant is selected from the group consisting of Zn2+, Mg2+, Si2+, Na+, K+, Sr2+, Cu2+, Fe3+/Fe2+, Ag+, Ti4+, CO32−, F−, MgO, ZnO, NaF, KF, FeO/Fe2O3, SrO, CuO, SiO2, TiO2, Ag2O and CaCO3, present in an amount between 0 and about 10 w %, from about 0.5 to about 5 w %, or from about 1 to about 3 w %, and methods of using same.
摘要:
The present disclosure is directed to modified metal materials for implantation and/or bone replacement, and to methods for modifying surface properties of metal substrates for enhancing cellular adhesion (tissue integration) and providing antimicrobial properties. Some embodiments comprise surface coatings for metal implants, such as titanium-based materials, using (1) electrochemical processing and/or oxidation methods, and/or (2) laser processing, in order to enhance bone cell-materials interactions and achieve improved antimicrobial properties. One embodiment comprises the modification of a metal surface by growth of in situ nanotubes via anodization, followed by electrodeposition of silver on the nanotubes. Other embodiments include the use of LENS™ processing to coat a metal surface with calcium-based bioceramic composition layers. These surface treatment methods can be applied as a post-processing operation to metallic implants such as hip, knee and spinal devices as well as screws, pins and plates.
摘要:
Various embodiments of surface-modified devices, components, and associated methods of manufacturing are described herein. In one embodiment, an implantable device suitable for being implanted in a patient includes an implantable material having a utile shape and a surface and a modification material deposited on at least a portion of the surface of the implantable material. The modification material has a release rate in an implantation environment in the patient. The modification material at the release rate is effective as bactericidal without being cytotoxic to the patient.
摘要:
Mesoporous calcium silicate compositions for controlled release of bioactive agents and methods for producing such compositions are disclosed herein. In one embodiment, mesoporous calcium silicate is synthesized by acid modification of wollastonite particles using hydrochloric acid. A hydrated silica gel layer having abundant Si—OH functional groups can be formed on the surface of wollastonite after acid modification. Bruhauer-Emmett-Teller (BET) surface area increased significantly due to acid modification and, in one arrangement, reached over 350 m2/g. Acid modified mesoporous calcium silicate compositions show a higher ability to adsorb protein compared to unmodified particles and demonstrate controlled release kinetics of these proteins.
摘要:
Particular aspects provide bioresorbable and biocompatible compositions for bioengineering, restoring or regenerating tissue or bone, comprising a three-dimensional porous or non-porous scaffold material comprising a calcium phosphate-based ceramic having at least one dopant therein selected from metal ion or ion dopants and metal oxide dopants, wherein the composition is sufficiently biocompatible to provide for a cell or tissue scaffold, and resorbable at a controlled resorption rate for controlled strength loss, depending on dopant composition, under body, body fluid or simulated body fluid conditions. Preferably, the at least one dopant is selected from the group consisting of Zn2+, Mg2+, Si2+, Na+, K+, Sr2+, Cu2+, Fe3+/Fe2+, Ag+, Ti4+, CO32−, F−, MgO, ZnO, NaF, KF, FeO/Fe2O3, SrO, CuO, SiO2, TiO2, Ag2O and CaCO3, present in an amount between 0 and about 10 w %, from about 0.5 to about 5 w %, or from about 1 to about 3 w %, and methods of using same.
摘要:
The present disclosure is directed to modified metal materials for implantation and/or bone replacement, and to methods for modifying surface properties of metal substrates for enhancing cellular adhesion (tissue integration) and providing antimicrobial properties. Some embodiments comprise surface coatings for metal implants, such as titanium-based materials, using (1) electrochemical processing and/or oxidation methods, and/or (2) laser processing, in order to enhance bone cell-materials interactions and achieve improved antimicrobial properties. One embodiment comprises the modification of a metal surface by growth of in situ nanotubes via anodization, followed by electrodeposition of silver on the nanotubes. Other embodiments include the use of LENS™ processing to coat a metal surface with calcium-based bioceramic composition layers. These surface treatment methods can be applied as a post-processing operation to metallic implants such as hip, knee and spinal devices as well as screws, pins and plates.
摘要:
Mesoporous calcium silicate compositions for controlled release of bioactive agents and methods for producing such compositions are disclosed herein. In one embodiment, mesoporous calcium silicate is synthesized by acid modification of wollastonite particles using hydrochloric acid. A hydrated silica gel layer having abundant Si—OH functional groups can be formed on the surface of wollastonite after acid modification. Bruhauer-Emmett-Teller (BET) surface area increased significantly due to acid modification and, in one arrangement, reached over 350 m2/g. Acid modified mesoporous calcium silicate compositions show a higher ability to adsorb protein compared to unmodified particles and demonstrate controlled release kinetics of these proteins.
摘要:
Particular aspects provide novel devices for bone tissue engineering, comprising a metal or metal-based composite member/material comprising an interior macroporous structure in which porosity may vary from 0-90% (v), the member comprising a surface region having a surface pore size, porosity, and composition designed to encourage cell growth and adhesion thereon, to provide a device suitable for bone tissue engineering in a recipient subject. In certain aspects, the device further comprises a gradient of pore size, porosity, and material composition extending from the surface region throughout the interior of the device, wherein the gradient transition is continuous, discontinuous or seamless and the growth of cells extending from the surface region inward is promoted. Additional aspects provide a device for bone tissue engineering, comprising a metal or metal-based composite member/material comprising an interior porous structure, wherein the pore size, porosity and material composition is selected to provide a device having an optimal density and/or elastic modulus and/or compression strength for a specific recipient. Novel methods for fabricating the devices are also provided.