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Basic Physical Property Requirement of Biomedical Materials


Basic Physical Property Requirement of Biomedical Materials 2012-11-26
Biomedical materials refer to the type of materials with special performance and functions, adoptable to artificial organs, surgical repair, physical therapy, rehabilitation, diagnosis and treatment without imposing negative influence on human tissues.
It is difficult to completely eliminate the infiltration of low molecular substances during the synthesis and processing process of biomedical materials. Certain residual monomer and intermediates might incur severe physiological reaction and even become extremely harmful. For instance, if the fluorine in the PTFE monomer is absorbed by human body, the person might experience symptoms similar to cold. Therefore, it is stipulated that the less the content of material leachables and exudates are, the better.
It is required that the permanent body implantation material embraces favorable biological stability; that is, no changes will take place in the high structure as well as the low structure of the material, no depolymerization will occur and the original composition of material does not induce the organism to indicate biological response under complex biological environment. The implantation experiments carried toward a variety of sheet polymer materials such as polymethyl methacrylate, polyamide, polytetrafluoroethylene, silicone rubber, polyvinyl fluoride and polyethylene show that the tissue reaction of polytetrafluoroethylene and silicone rubber is the smallest among all the materials; it further proves that these two materials possess satisfactory biological stability.
Certain human body implantation materials from China Iron & Steel Research Institute Group demand required mechanical and physical properties. For instance, synthetic materials designed to repair fascia defects are supposed to have great tensile intensity; materials to be implanted in the moving parts of human body are required to have excellent flexing resistance. Therefore, sufficient consideration should be given to the performance and property of implantation material when under the action of stress and force.
Molding materials should complete the designed specific processing technology and be applied clinically only after they could be processed into requested shapes and sizes. Although certain materials project desirable performance, their applications are restricted by the difficulties encountered in the molding and processing procedure. This principle is extremely applicable to implantation materials used in plastic surgery. As a result, convenient processing is the basic requirement for Metallic Membrane.
The biomedical materials could not be used after they are disinfected and sterilized. Different biomedical materials demand strict disinfecting and sterilizing requirements; it is noted that the usage terms should be strictly referred to during the sterilizing process or else the performance of the materials will be seriously affected. The influence brought along by the disinfecting and sterilizing together with the potential biological hazardous effects should be equally considered when selecting sterilizing method for the biomedical material.For more information about, you can visit our website(www.cisri-int.com) and please feel free to contact us.