The textile industry is very old and many technologies have been developed for processing woven or non-woven fabrics. Textile techniques have been adopted for the fabrication of tissue engineering scaffolds. For example, fibrous scaf¬folds have been created for engineering cartilage, tendons, bone, heart valves, blood vessels, nerves, and so on. Examples of fiber and textile fabrication techniques include fiber bonding and fused deposition modeling.
Fiber Bonding:
One big advantage of using fibers is that they provide a very large usable surface area, which is desirable for scaffold applications because it provides more surfaces for cells to attach to. By simply piling the fibers together, three-dimensional scaffolds can be obtained. However, the scaffolds constructed using this method lack structural stability. To improve the stability, the fiber bonding technique may be used. This technique involves use of a binder, or, by using the ther¬mal method to fuse the fibers together.
Rapid Prototyping Textiles: Fused Deposition Modeling:
Rapid prototyping ( RP) can be used not only with polymers, but with textiles as well, with the typical example being fused deposition modeling. In brief, fibers are extruded from the head of a thermal extruder in a semi-liquid state, directed precisely to the desired position, and fused with other fibers during a solidifica¬tion process. A computer-controlled platform with accurate X, Y, and Z move¬ment.
3- Inorganic Scaffold Fabrication:
Porous bioceramics, such as hydroxyapatite ( HA ) , tricalcium phosphate ( TCP) , and Bioglass , have been developed for hard tissue implants and tis-sue engineering scaffolds, owing to their excellent material properties. These properties include excellent biocompatibility and bioactivity, bioresorption in calcified tissue, macroporosity, which facilitates cell and tissue ingrowth, as well as nutrient and waste product transport and vascularization. There are basically two routes to fabricate three-dimensional biominerals scaffolds, which vary according to the temperature applied.
The High Tempera
المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .
|