个体化钛合金掌指关节假体设计及快速成型制造的研究

目的 探讨运用计算机辅助设计及快速成型技术制造出个体化钛合金人工掌指关节假体的方法,为掌指关节的假体置换提供一种新的假体.方法 应用3DMSR软件对掌指关节二维CT轮廓数据进行三维重建,然后在图像处理软件Surface9.0上进行个体化人工假体及其髓内假体柄的计算机辅助设计.输出的数据模型在FS-320QZ激光快速成型机上制造出快速成型树脂模型,经硅胶翻模、制作蜡模、成壳、浇铸,抛光后获得钛合金个体化人工掌指关节假体.结果 经过对螺旋CT扫描的掌指关节的二维图像进行三位重建和CAD得到的个体化掌指关节假体模型,假体模型关节面表面光滑,设计的假体柄体现了原始髓腔的基本形态及大小,转换成快速成型机通用的STL格式数据,输入快速成型机便获得树脂模型,经过一系列铸造过程完成个体化钛合金假体的制造.结论 利用CT数据获得掌指关节三维轮廓信息,利用快速成型技术、熔模制造,可获得满意的个体化钛合金人工掌指关节假体.

The design and fabrication study of custom-made metacarpophalangeal joint prosthesis made of titanium alloy

Objective To explore the method of design and fabrication of custom-made joint prosthesis using computer assisted design (CAD) and rapid prototyping (RP) technique and provide a new prosthesis for metacarpophalangeal (MP) joint replacement.Methods3D contour image was reconstructed from 2D CT scans of the MP joint using 3DMSR software.Custom-made joint prosthesis and intramedullary stem were designed with Surface 9.0 image processing software.After being convened into STL data format,the computer-assisted design was imported into the FS-320QZ rapid prototyping machine,and the resin prototype was made.The RP model was used as a positive mould to build a silicon negative mould,and the negative mould was sent to the factory to manufacture Ti-6A1-4V alloy MP joint prosthesis through ordinary mould-melted founding process.Results Individualized prototype of MP joint prosthesis was obtained by 3D reconstruction of 2D spiral CT scans of the MP joint and CAD technique.The joint surface of the prosthesis was smooth and the intramedullary stem matched the intramedullary cavity shape and size.The dataset was converted into STL data format.After a series of molding,melting and founding processes,custom -made MP joint prosthesis made of titanium alloy was manufactured.ConclusionIndividualized MP joint prosthesis can be made using CAD and rapid prototyping technique based on 3D reconstruction of CT seam of the MP joint of interest.