Projeto de uma protése para membros torácicos para cães utilizando conceitos de DFAM

Abstract

The construction of the prosthesis, using a three-dimensional printer, takes into account the patient's biomechanics, the variables present in the displacement of a dog, type of amputation, prostheses already on the market, stability and adaptability of the dog with the prosthesis. The options of the prosthesis consist of variations of couplings and bases, with a linkless coupling, an articulated coupling, and three support bases with different offsets that can be mounted on both styles of couplings because the bases are interchangeable. With these assembly variations, load and displacement analysis is performed in a finite element software with the ABS material that has 38 MPa yield strength, the most critical among three materials considered for construction. With the defined geometry, the maximum applied stress results of 21.8 MPa are obtained for the non-articulated coupling prosthesis + flexible base, which is below the material flow limit. While the articulated coupling + flexible base presented a maximum applied stress of 23.3 MPa, also below the maximum yield stress of ABS. The displacements were close to 15mm and 16mm for the rigid coupling + flexible base and articulated coupling + flexible base, respectively, and these results were evaluated as satisfactory. Observing all the results of all variations, it is noted that the yield stress of the ABS material supports the application of load, in addition to the displacements having an acceptable variation considering the total size of the dog's limb. [resumo fornecido pelo autor]