中文摘要：

目的研究一种符合人体手部生物力学的个性化、不等刚度的弹性支具。方法临床获取一例24岁女性拇指指骨骨折CT数据,通过融合医学影像三维重建技术、计算机辅助设计技术、有限元分析及3D打印技术,获得本研究的指骨骨折支具。结果有限元分析获取了支具的确切生物力学性能指标,即支具1 cm~2的外表面上可承受49 N的外力作用而不会再次对骨折部位造成伤害。采用线状TPU材料快速成型指骨骨折支具,并获得打印机最优打印参数。结论该支具不仅匹配患指形状,还匹配骨折部位,实现了精确固定。此外,该支具不但具有确切的生物力学性能指标,还具有透气、穿戴舒适、美观等优势,解决了石膏固定透气性差、高分子绷带固定不牢靠、夹板固定压迫边缘皮肤的缺陷。

英文摘要：

Objective To study a customized elastic brace with unequal rigidity,and which accords with the biomechanics of the human hands. Methods The CT data of a 24-year-old female with phalanx fracture were obtained clinically. The phalangeal fracture brace was obtained with the help of the 3D reconstruction of the medical image,the computer aided design,the finite element analysis（ FEA） and 3D printing. Results The exact biomechanical performance indicators of the external fixator was obtained via FEA. The results showed that 1cm~2 surface of the brace could withstand 49 N external impact without any re-injury to the fracture site.The linear TPU material was used to rapidly form the phalangeal fracture brace and a set of optimal 3D printing parameters matching the material were obtained. Conclusion The brace not only matched the shape of the defected finger,but also the fracture site,thus achieved the accurate and precise fixation of the fracture site of the phalanx. The brace has a number of advantages in permeability,wearing comfort and appearance,etc.And a variety of defects were solved such as the poor permeability of gypsum fixation in the field of external fixation,the unstable polymer bandage fixation and the compression of edge of the skin by splint.