BACKGROUND: Biomedical materials contact internal environment of human body, and sometimes are implanted into organism. Therefore, they should have biocompatibility, chemical stability, suitable physical mechanical function and simple processing and molding, but no toxicity.OBJECTIVE: To investigate the preparation of biomedical polymer anticoagulant materials in the aspects of bioinert material, biological active surface, albumin structure and application in anticoagulation.METHODS: A computer-based online search of PubMed and Wanfang database was performed for articles related to preparation of biomedical polymer anticoagulant materials published between 1969 and 2010.RESULTS AND CONCLUSION: Currently preparation of anticoagulant materials commonly utilizes bioinert surface or bioactive surface alone, which has obtained good effects, but the biocompatibility, such as blood compatibility, cannot be retained for a long period of time. The combination of bioinert surface and bioactive surface plus albumin, natural constitutions in human blood may be the trend of anticoagulant materials development. Polyethylene glycol with high bioinert property in combination with albumin recognition factor cibacron blue with high bioactivity can be used to prepare active modifier, which is used to modify polyurethane.

BACKGROUND:As the cardiovascular device, biomaterials applied under the blood-contact conditions should have anti-thrombotic, anti-biodegradable and anti-infective properties. OBJECTIVE:To review the research progression in polymer materials for implantation and intervention in cardiovascular tissue engineering and to explore the biocompatibility, blood compatibility and cytocompatibility of the surface-modified polymer biomaterials based on the surface endothelialization using tissue engineering techniques. METHODS:We retrieved PubMed and Wanfang databases for relevant articles publishing from 1963 to 2015. The key words were“Biocompatibility, Blood compatibility, Biomedical Materials, Biomedical polymer materials”in English and Chinese, respectively. Those unrelated, outdated and repetitive papers were excluded. Literatures addressing the blood compatibility, biocompatibility, and cytocompatibility of the surface-modified polymer biomaterials based on the surface endothelialization using tissue engineering techniques were investigated by summarizing function of vascular endothelial cel s, tissue-engineered endothelial cel s on the implant surface, fixation of cel growth-promoting factor on the surface of polymeric biomaterials, and endothelialization of the material surface. RESULTS AND CONCLUSION:Total y 71 relevant articles were included. The tissue-engineered modification of endothelial cel s on the surface of polymer biomaterials and their biocompatibility and cel compatibility are crucial for developing novel polymer materials for implantation and intervention in cardiovascular tissue engineering. Through in-depth studies of the types and applications of polymer biomaterials, cardiovascular medical devices and implantable soft tissue substitutes, the differences between the surface and the body wil be reflected in the many layers of molecules extending from the surface to the body. Two major factors, surface energy and molecular mobility, determine the body/surface behaviors that include body/surface differences and phase separation. Considering the difference between the body/surface composition, an additional determinant is indispensable, that is, the crystal ization behavior of each component.

BACKGROUND:Cardiovascular biomaterials applied under the blood-contact conditions must have anti-thrombotic, anti-biodegradable and anti-infective properties. OBJECTIVE:To develop novel polymer materials for implantation and intervention in cardiovascular tissue engineering and then to explore the biological, blood and cellcompatibilities of corresponding surface-modified polymer biomaterials based on surface construction and biological response.
METHODS:We retrieved PubMed and WanFang databases for relevant articles publishing from 1984 to 2013. The key words were“biocompatibility, blood compatibility, biomedical materials, biomedical polymer materials”in English and Chinese, respectively.
RESULTS AND CONCLUSION:Here, we analyze the fol owing four aspects:protein adsorption, biometric identification in celladhesion, and the“waterfal model”for enzyme catalysis during blood coagulation and fibrinolysis. Consequently, it is concluded that the functional surface construction of polymer biomaterials and research on corresponding biocompatibility and endothelial cellcompatibility are crucial for developing novel polymer materials for implantation and intervention in cardiovascular tissue engineering. Through in-depth studies of the types and applications of polymer biomaterials, cardiovascular medical devices and implantable soft tissue substitutes, the differences between the surface and the body wil be reflected in the many layers of molecules extending from the surface to the body. Two major factors, surface energy and molecular mobility, determine the body/surface behaviors that include body/surface differences and phase separation. Considering the difference between body/surface composition, an additional determinant is indispensable, that is the crystal ization behavior of each component.

Objective: To study the effect of zinc supplement on bone-contacting implant surface ratio (BCSR).Methods: 40 rabbits with titanium implants placed into the proximal tibial heads were divided randomly into zinc supplement group(n=20) and control group(n=20). 1% zinc sulfate in 0.9% saline was administered intramuscularly at the dose of 4 mg/(kg?d) for each tested animal, and the same amount of 0.9% saline was used for the controls. The animals were sacrificed 1, 2, 4, 8 and 12 weeks after treatment respectively.BCSR,bone zinc content and serum Cu/Zn values were measured with morphometry, atomic absorption photometry and atomic nebulizntion absorption method respectively.Results: Zinc supplement could significantly increase the BCSR value (P0.05). Conclusion: Moderate zinc supplement may increase the bone-contacting implant surface ratio, but not alter the zinc metabolism.

This paper aimed to present the surface modification of tissue engineering materials and its correlation with cell compatibility from the aspects of cell-compatibility polymer surface group transformation and bioactive molecule immobilization.

AIM:To analyze the mechanism,thermadynamic theoretical basis,dynamic mechanism and influencing factors of thermally induced phase separation (TIPS)in order to completely grasp the factors affecting the size,distribution and form of pores,so that the adjusted range of pore can be widened and the preparation of Porous membrane can be repeated and controlled.METHODS: Considering from the structural characteristics of tissue engineered materials,the methods of preparing porous membrane using TIPS technique,the hermadynamic theoretical basis,dynamic mechanism and influencing factors were analyzed,the problems and investigative directions in the future were also analyzed.TIPS technique is a process of phase separation of polymer homogenous solution under quenching,and it is suitable for diameter and structural form of the micropore materials prepared using TIPS are closely correlated with the kind and dispensing proportion of polymer attrnuant,polymer concentration and polymer molecular mass,etc.conducted,including determination of polymer-solvent system phase diagram,study of form and appearance of porous membrane of different thickness,study of form and appearance of porous membrane prepared with systems of different X,which is the parameter of polymer-solvent interaction.

Surface physical chemical properties of tissue-engineered materials are greatly important for histocompatibility of the materials. Therefore, surface modification based on original physical mechanical performance could promote cell attachment and growth or bioactive molecule, and significantly improve material cell compatibility. To date, plasma and grafting has become main methods of surface modification of polymers. This paper introduced plasma and grafting methods of surface modification of materials and the application in tissue engineering.

BACKGROUND: The development of tissue engineering has provided a possibility for repairing and reconstructing tissues or organs. However, studies on biomedical tissue-engineered and polymer tissue-engineered materials need to be investigated. OBJECTIVE: To clarify the content of tissue engineering and the application of polymer material in tissue engineering from the point of biocompatibility. RETRIEVAL STRATEGY: Using the terms "tissue engineering, tissue engineering materials, Polymers materials, bio-compatibility, bio-compatibility materials, cell-compatibility, cell-compatibility materials", we retrieved PubMed database to identify studies published between January 1990 and December 2007 in the English language. At the same time, we searched Wanfang database with the same terms in the Chinese language. After primarily selected, 81literatures were kept. Inclusive criteria: studies, whose contents are related to biocompatibility of tissue-engineered materials. Exclusive criteria: repetitive studies or Meta analysis. Thirty literatures corresponded to the inclusive criteria, and fifty-one were rejected due to obsolete or repetitive contents. Among the 30 included literatures, 19 were about biocompatibility, and the remaining 11 about cellular compatibility materials. LITERATURE EVALUATION: The included studies were mainly from Pubmed database and Wanfang database. A total of 25 treatises and 5 reviews were kept. DATA SYNTHESIS: The content of tissue engineering consisted of seeded cell inoculation, biomaterial implanting and cell transplantation. Allogenic, autogenous, and xenogenous tissues were in vitro broken into cells, and then reconstructed through inoculation and proliferation by gene reconstruction technique. Much attention should be focused on how to reconstruct tissue-engineered materials with materials and living cells, I.e. To reconstruct active materials with biological functions. Tissue-engineered materials should have the best interface reaction effect between material surface and cells. Therefore, the core of studying tissue-engineered materials is to design a device, which has chemical molecular level and three-dimensional molecular level cell/material mixed surface, and also has a three-dimensional molecular level appearance corresponding to biomechanical requirement. Polymer materials have good physical mechanical functions, and their molecular structures are closer to living body. Therefore, polymer materials are widely used as biomaterials and exert an important role in the field of tissue engineering. CONCLUSION:To study biomaterials with good tissue compatibility is the basis for tissue engineering development. Polymer materials are widely used in the tissue engineering due to their good property and molecular structure closer to living body.

BACKGROUND:To clarify the effects of topology of tissue engineering material surface on cell compatibility from random roughness.porosity,groove/ridge, fiber,texture and protein tracks 6 aspects. STUDY SOURCES: Using the terms"biocompatibility,biocompatibility materials,tissue engineering,tissue engineering materials.cell-compatibility and cell-compatibility materials",we searched the PUBMED database to identify studies published in the English language from January 1987 to January 2007. STUDY SELECTION:The data were selected primarily.The quotations in each paper ware looked for.Inclusive criteria: The contents stated in papers were related with biocompatibility of tissue engineering material. Exclusive criteria: repetitive study or Meta analysis papers.DATA EXTRACTION:Totally 74 related papers were collected.Thirty-two met inclusive criteria,among which,24 related with biocompatibility and 8 related with cell-compatibility materials.The other 42 papers were excluded due to obsolete or repetitive contents. DATA SYNTHESIS:①The interaction of tissue engineering material and living body:Various Interactions producing when high polymer tissue engineering material contacts with tissue of living body are reviewed. It js pointed out that the interaction of material and living body depends on the biocompatibility degree of material;The influences of materials on histocompatibility include microscopic molecular level and macroscopic scale level,moreover,the effect of macroscopic scale level (include the topology of material surface) is more important than chemical effect of microscopic molecular level.②Effects of physical and chemical properties on cell-compatibility of materials:The effects of topology of surface of random roughness,porosity,groove/ridge,fiber, texture and protein tracks 6 kinds of materials on cell-compatibility are reviewed. It is also pointed out that the influences are very important in studying the biocompatibility of tissue engineering material and designing tissue compatibility materials.CONCLUSION:Topology of material surface has great influences on cell-compatibility of material.The interaction of cells and polymer is an index to evaluate cell-compatibility of material.Short-term interaction degree of cell and polymeric material can be assessed by detecting the adhesion degree of cells and polymeric material surface,while long-term interaction by detecting the growth of cells cultured in vitro or polymeric material implanted in vivo.

OBJECTIVE: To discuss the influence of physical and chemical properties of tissue engineered material surface on the cell compatibility, involving the surface energy, hydrophilicity/hydrophobicity, chemical structure and active factors loaded on the material surface, point out that the physical and chemical properties of material surface have great influence on the cell compatibility of the material, i.e., explain the cell compatibility of tissue engineered materials.DATA SOURCES: An online search of Pubmed database was undertaken to identify relevant articles published in English from December 1997 to December 2006 using the keywords of "bio-compatibility, bio-compatibility materials, tissue engineering, tissue engineering materials, cell-compatibility". Meanwhile, Chinese relevant articles published from December 1997 to December 2006 were searched in Wanfang database with the same keywords in Chinese.STUDY SELECTION: The data were primarily checked. Inclusive criteria: articles about tissue-engineered materials of biocompatibility. The repetitive studies or Meta analysis were excluded.DATA EXTRACTION: Totally 71 relevant literatures were collected, 33 of which were accorded with the inclusive criteria, and the 38 repetitive ones or with old contents were excluded. Of the 33 involved literatures, 22 dealt with biocompatibility, and 11 with the cell-material compatibility.DATA SYNTHESIS: ① Interaction of tissue-engineered materials with organism: The various interactions of tissue-engineered polymer materials with organism are summarized. It is pointed out that the interactions of materials with organism decide the degree of material-tissue compatibility. The effects of material on the tissue compatibility result from the micromolecular and macroscopic levels, and the chemical effect of the macroscopic level is more important than that of the micromolecular one. ② Influence of the physicochemical properties of the material surface on the cell-material com coatibility:The influences on the cell-material compatibility by the chemical nature and structure, composition, energy, hydrophilicity/hydrophobicity, charges and active factorsloaded on the surface are summarized. The obtained information is the important contents for understanding the biocompatibility of the tissue engineered materials and designing biocompatible materials. CONCLUSION: The physical and chemical properties of the material surface greatly affect the cell-material compatibility. The interaction of cells with the polymer matrix is an index to evaluate the cell compatibility. The degree of the short-term interaction of cells with polymer materials can be evaluated by the degree of adhesion on the surface of the polymer materials, while the long-term interaction can be evaluated by detecting the growth of cells cultured in vitro or implanting the polymer material.