Correlation analysis between the interface membrane and loose hip prosthesis

Objective To analyze the cause of prosthesis loosening by observing the interface membranes harvested during the hip restoration operation. Methods A total of 28 specimens of interface membrane around the loose prosthesis were harvested from 28 patients undergoing the restoration of total hip replacement. All the specimens underwent the observation of appearance, light microscopy and scanning electronic microscopy(SEM). Results All the gaps around the loose prosthesis were filled with interface membrane of different thickness. The color of the most interface membrane was madder red, and the other one third of membrane was black. The comparatively thicker membrane was similar to scar connective tissue while the thinner was similar to fiber membrane. A large number of wear debris, macrophages and foreign-body giant cells were found under light microscope. With SEM observation a large number of different diameter collagen fibra structures that looked like scar tissues were arranged disorderly in a great mass, foreign particles and bone debris of different size were distributed unevenly, and the fibroblast was distributed in the collagen fiber. Conclusion Wear debris is related to inflammatory cell response around the interface membrane of the loose prosthesis. The wear debris engulfed by macrophage stimulates the interface membrane to release bone resorption factors (such as TNF) which lead to osteolysis, and this is one of the most important causes of the prosthesis loosening.     

螯合纤维及离子交换树脂对铜离子吸附动力学性能比较

考察了实验室自制离子螯合纤维和商用D113交换树脂对铜离子的吸附动力学。用Langmuir方程和Freundlich方程拟合吸附等温线,用准一级和准二级动力学方程拟合吸附速率和再生速率实验数据,结果显示螯合纤维及D113树脂对铜离子的吸附等温线符合Langmuir模型,螯合纤维的准一级和准二级吸附速率常数分别是D113树脂的12和30多倍,再生速率常数分别是D113树脂的7倍和6倍。浓度影响实验和中断实验结果显示,螯合纤维对铜离子的吸附速率由膜扩散控制,而D113树脂对铜离子的吸附速率在低浓度(<200mg/L)的时候由膜扩散控制,较高浓度(>300mg/L)时由膜扩散和粒扩散共同控制。     

大连兴科推出高品位碳纤维材料

碳纤维是一种新型的高性能纤维增强材料.它具有高强度、高模量、耐高温、耐磨、耐腐蚀、抗疲劳、抗蠕变.导电、导热和远红外辐射等诸多优异性能。它可以以复合材料形式减轻构件重量,从而提高构件     

聚丙烯纤维混凝土在永立桥桥面铺装中的应用

文章结合京良路永立大桥加固工程,对聚丙烯纤维混凝土在桥面铺装中的应用进行了全面的论述,分析了纤维网对混凝土强度的影响机理,总结了该混凝土铺装的施工工艺及施工中的注意事项,为该技术的应用推广提供了宝贵的经验。     

压缝带

深圳市魁道实业有限公司生产的压缝带是国内较早把压缝带应用在修补道路裂缝的厂家，该产品主要由改性沥青、高强粘结材料、高强纤维、抗老化剂、抗剥落剂等12种材料组成，用于修补裂缝，防止裂缝的啃边、崩边、渗水。     

复式纤维改性稀浆封层在省道老宽线上的应用

结合老宽线中修工程施工,介绍了复式纤维改性稀浆封层结构、材料、作用原理和施工工艺等技术特点,简要论述了该结构在公路养护方面的适应性和应用前景.     

压缝带

深圳市魁道实业有限公司生产的压缝带是国内较早把压缝带应用在修补道路裂缝的厂家,该产品主要由改性沥青、高强粘结材料、高强纤维、抗老化剂、抗剥落剂等12种材料     

防水钢纤维混凝土配合比设计与施工工艺

以长珲一级公路桥面铺装CF40防水钢纤维混凝土现场实际，介绍防水铜纤维混凝土配合比设计与施工工艺。