Vinet R, Lozac'h Y, Beaudry N, Drouin G
Mechanical Engineering Department, Ecole Polytechnique de Montréal, Ouébec, Canada.
J Rehabil Res Dev. 1995 Nov;32(4):316-24.
The first part of this paper reviews different approaches to define the motion of the fingers and the thumb in order to obtain prehension. The last part presents the design of a hand prosthesis based on a new plane of action for the thumb and on proposed design specifications and functional characteristics. The design methodology consists of two steps: the morphology design of the hand prosthesis and the 4-bar mechanism design for each finger. A 3-D computer-aided design (CAD) interactive program was used as a design tool to obtain the hand morphology. This CAD technique was also used to check the geometry, the relative motions of the fingers, and the possibility of interference for the proposed model with two prehension patterns (tridigital and lateral). It is noted that identical flexion angles of the finger joints were obtained for these two prehension patterns, the difference being in the inclination angle of the thumb's plane of flexion. This finding greatly simplified the design of the internal mechanisms of the fingers. CAD was a powerful tool in the design process of this hand prosthesis and will be more and more useful in the future.
本文的第一部分回顾了为实现抓握而定义手指和拇指运动的不同方法。最后一部分介绍了一种基于拇指新作用平面以及所提出的设计规格和功能特性的手部假肢设计。设计方法包括两个步骤：手部假肢的形态设计和每个手指的四杆机构设计。使用三维计算机辅助设计（CAD）交互式程序作为设计工具来获取手部形态。该CAD技术还用于检查所提出模型在两种抓握模式（三指抓握和侧方抓握）下的几何形状、手指的相对运动以及干涉可能性。值得注意的是，这两种抓握模式下手指关节的屈曲角度相同，不同之处在于拇指屈曲平面的倾斜角度。这一发现极大地简化了手指内部机构的设计。CAD在这种手部假肢的设计过程中是一个强大的工具，并且在未来将越来越有用。
