Desenvolvimento de prótese passiva para mão humana com sistema mecânico para restaurar movimentos dos dedos

Abstract

Several types and models of sophisticated prostheses can be found in the international market, incorporating advanced technologies such as microprocessors, motors and complex electronic circuits. However, as they are not produced on a large scale, access to these devices is restricted for those people who have a higher purchasing power. In this context and taking into consideration the relevance of the subject, this work aims to develop a low-cost human hand prosthesis manufactured through additive manufacturing. The methodology used for the development of the prosthesis used affordable and low-cost materials in the market. Tensile testing was performed to estimate the mechanical properties in order to verify the resistance of the printing material used. To design the prosthesis, it was considered that its operation will be purely mechanical and uses wrist flexion movements to perform its functions. The prosthesis components and their mechanical system were designed using 3D CAD software, taking into account the dimensions of the healthy limb and stump of users reported in the literature. Afterwards, the mechanical feasibility study executed on the device was performed using finite element software. In conclusion, can observe fundamental factors that influence the 3D printing process, especially in relation to its printing parameters and mechanical properties. Maximum stress, yield stress, modulus of elasticity, elongation and hardness are the prominent properties that should be considered when choosing the polymeric material, in the case of this work the material studied is PETG (Polyethlene Terephthalate Glycol). According to the simulation the surface did not present plastic deformations and / or ruptures, in other words, the developed device has mechanical viability.