Oclusor ativo implantavel para colostomias : prototipo

AUTOR(ES)
DATA DE PUBLICAÇÃO

1997

RESUMO

: Aiming to improve the quality of life of colostomates, the prototype of na Active Implantable Colostomy Occluder was built. The fundamental idea is to reproduce the natural sphincter?s action by using a construction band placed around the stoma and pulled by a step motor. The active element of the prototype is a step motor and its torque is powered by three mechanical gear reductions. The first one consists of two Nylon toothed wheels giving a 1:1,28 reduction ratio. The smaller one is fixed to the motor?s shaft and the other moves an andless screw and a toothed wheel, both in bronze and with a 1:6,5 reduction. The last reduction is effected by another endless screw, built in stainless-steel, which is moved by the bronze toothed wheel and gives a 1:14 reduction. This second screw moves a nut to which is fixed an 80 mm long, 12 mm wide polytetrafluoroethylene vascular implant, used as the constriction band. All these mechanical components were placed inside a two-piece case of ultrahigh molecular weight polyethylene, and the whole prototype was covered with medical grade silicon rubber. To operate the prototype, we built a control unit with the suitable logical commands using CMOS technology, a SGS L297 stepper motor controller IC and a SGS L298N dual full-bridge driver IC (...continue)

ASSUNTO(S)

orgãos artificiais colostomia fezes - incontinencia bioengenharia

ACESSO AO ARTIGO

Documentos Relacionados