Based on Darcy-Brinkman Model, a theoretical study of laminar film condensation on a vertical tube surface with thin porous coatings was carried on. The results show the parameters of porous coatings (including conduc...Based on Darcy-Brinkman Model, a theoretical study of laminar film condensation on a vertical tube surface with thin porous coatings was carried on. The results show the parameters of porous coatings (including conductivity, porosity, permeability and coating thickness) and the surface subcooling have influence on condensation. Especially, the coating thickness is a key factor. Condensation will be considerably enhanced if the thickness is properly evaluated.展开更多
Total hip arthroplasty （THA） is one of the most clinically successful surgeries. Despite the prevalence of THA, the number of revisions for septic or aseptic reasons continues to increase.
In the experiment, we inserted the implants coated with TC4 fibers and particles into the bones of dogs.The histological characters of the bone ingrowth and the state of bone remodelling at interface were observed. An...In the experiment, we inserted the implants coated with TC4 fibers and particles into the bones of dogs.The histological characters of the bone ingrowth and the state of bone remodelling at interface were observed. And then the whole course of the fatigue injuries accumulation at the interface was monitored by scanning electron microscopy equipped with fatigue stage. Experiments show that the collagen fibers of bone interweave in the porosity of implants, which were strengthened by hydroxyapatite crystal. The collagen fibers were bound to the porous layer implant and the binding strength was enhanced by hydroxyapatite crystal. The remodelling state of bone in pores of implant and around the interface play a key role in determining the fatigue strength and the life span of the interface between bone and implant. Therefore, we consider that the interlocking fixation between bone and implant can be more exactly explained as binding mechanism.展开更多
文摘Based on Darcy-Brinkman Model, a theoretical study of laminar film condensation on a vertical tube surface with thin porous coatings was carried on. The results show the parameters of porous coatings (including conductivity, porosity, permeability and coating thickness) and the surface subcooling have influence on condensation. Especially, the coating thickness is a key factor. Condensation will be considerably enhanced if the thickness is properly evaluated.
文摘Total hip arthroplasty （THA） is one of the most clinically successful surgeries. Despite the prevalence of THA, the number of revisions for septic or aseptic reasons continues to increase.
文摘In the experiment, we inserted the implants coated with TC4 fibers and particles into the bones of dogs.The histological characters of the bone ingrowth and the state of bone remodelling at interface were observed. And then the whole course of the fatigue injuries accumulation at the interface was monitored by scanning electron microscopy equipped with fatigue stage. Experiments show that the collagen fibers of bone interweave in the porosity of implants, which were strengthened by hydroxyapatite crystal. The collagen fibers were bound to the porous layer implant and the binding strength was enhanced by hydroxyapatite crystal. The remodelling state of bone in pores of implant and around the interface play a key role in determining the fatigue strength and the life span of the interface between bone and implant. Therefore, we consider that the interlocking fixation between bone and implant can be more exactly explained as binding mechanism.
