Study Of Medical Composite Splint

Fabric structural composites have been widely used due to its superior mechanical properties, competitive production cost and excellent conformability to different shapes of reinforcement structure. When it comes to clinic treatment, textile composite splint as a newly developed product is attracting more and more attention of scholars and companies because of its outstanding properties such as light weight, easy to use, X-ray penetrating and so on. And it will effectively take the place of traditional material such as gypsum and wood-based panels. At present, there is little study about this subject in China, and more and deep investigation needs to be done.Firstly, we put forward the concept of fabric conformability or fabric adaptation to shape for the first time, which is the ability of fabric to conform to a certain shape without wrinkles under small forces or gravity. Although the conformability and formability of fabrics are both important for textile composite, there is not strict differentiation between the former and latter in the past. And fabric formability is usually defined as its deformed behavior when it conforms to a certain shape. In fact, the effect of fabric formability is greatly affected by force-applying condition and force amplitude. Then it is suitable to investigate the influence of fabric construction on the conformability behavior of fabric by the device designed in this paper because of small stress exerted.Secondly, in order to investigate fabric conformability and discuss the factors, a completely new testing method was proposed here, which was called ball-falling method. The test device can simulate the condition when fabric conforms to certain geometry under non-equivalent, random, and gentle forces. After a plenty of tests, it shows that this instrument has reasonable structure and is suitable to evaluate fabric conformability with high identification and stability.Then, we made use of matlab graphic treatment technology to evaluate fabric conformability on the basis of the ball-falling device. A conformability coefficient was defined here to characterize the ability of fabric to conform to a certain shape. And five classes were divided according to the coefficient, with the fifth class is the best, and the first class is the worst. At meanwhile, a group of standard sample pictures for evaluation were defined, and all those fabrics tested here were estimated by this method. The results obtained by these two methods were compared at last, and they were in good agreement with each other.To improve the efficiency of selection of fabrics used for composite splint furthermore, we tried to simulate the conforming behavior of fabric to some shape by finite element analysis. Here, we chose Abaqus-one kind of FEA software in which it is required to select constitutive equation and element type suitable to fabric, define material properties, assemble parts, mesh and some other procedures. Ultimately we simply simulated the forming behavior of a fabric on a sphere. It paved the way for predicting fabric conformability, and it is of much help to develop fabric used for composite with excellent conformability.For the kind of composite splint forming into the desirable shape before use, it is key to obtain the shape consistent with the fixation part. Here, we made use of Reverse Engineering, which is developed from advanced manufacturing industry, to gain the 3-dimensional coordinates of the fixation part by 3-dimensional scanning apparatus, then rebuild the model by reverse software, and at last translate it into track code of the manufacturing machine, and then we can get the shape model consistent with the desirable part. We explored a new way to manufacture the composite splint needed to forming before ahead.In the end, we investigated the resin used for composite splint, designed the Ultra violate device, made some samples, and it was verified to be in good performance, and the manufacture method is properly.