Diseño mecánico de 24 prototipos de prótesis de mano escalables para niños de 6 a 12 años utilizando software CAD.

Abstract

The research aimed at the mechanical design of 24 scalable hand prosthesis prototypes for children 6 to 12 years of age, in order to generate a database to be used in future projects in the Bioengineering Research and Studies Group. -GIEBI from ESPOCH. A study of the state of the art of works focused on prototypes of hand prostheses was carried out. The flexion and extension movement of the fingers was selected to generate a cylindrical grip of objects. The dimensions of the main parts of the hand were measured in 90 boys and girls in an Educational Unit, and the average of dimensions was obtained, which served to model and scale the prototypes. For the model of the base support system, an anthropomorphic design similar to the human hand was used, on the other hand, for the movement transmission system, the anthropomorphic finger mechanism was used, which is integrated by two crossed mechanisms of four bars. coupled between them. To activate the movement transmission mechanism, two micro servomotors were used, one for the index, middle, ring, little finger, and the second for the thumb, where the transmission system transforms the rotational movement into linear movement of the motors. . The parts were modeled and a base prototype assembled, with which the scaling of the 24 prototypes was generated based on the average measurements of the hands. The kinematic and dynamic analysis of the prototype was carried out. Pla was used as a material for the 3D printing of the prototype support system, with a Tri-hexagonal filling structure. Finally, the impression of a prosthesis prototype of an 11-year-old boy was made.