Uso de modelagem 3D para desenvolvimento e confecção de dispositivo para ampliação de sínfise púbica em felino

Abstract

Pelvic fractures represent 20-30% of all fractures that affect cats, if not treated accurately at the moment when the injury occurs, the pelvic canal collapse may develop bigger complications. The technique of pelvic symphyseal distraction osteotomy is performed when the symphysis stays intact with canal stenosis and when the pelvic canal’s diameter is reduced horizontaly, considering that the use of implants that allow a bigger pelvic canal’s spacing is very common in this technique. Techniques utilizing spacers are already present in surgical literature, however the usage of prototyping technology and three-dimentional printing can offer possibilities to customize models of easy application for the pelvic canal’s expansion, therefore, the aim of this work is to construct a three-dimentional device in order to expand the pubic symphysis. For the development of the device, I used an adult, male, feline’s corpse of unknown age, formally gave by its previous owner to the Hospital Veterinário Universitário – HVU/UEMA for purposes of research. The digital model was elaborated through the Blender 3.1.2® software and its ideal form was constituted of three parts: a central piece and two side wings. The final digital model was exported in STL (Standartd Triangle Language) format to be renderes in the Preform 3.30 softwarea and printed in the 3D Form 3B+ printer. The prototype application in the corpse was performed reproducing the techniques of access to the region, the model application and the synthesis of accessed plans. The usage of a 3D printed spacer is an alternative for hemipelvis distraction, considering the distraction level’s customization and accommodation to the anatomy. The constructed prototype presented satisfactory results, allowing the viabilization of the executed method in order to create 3D pelvic spacers and application in vivo.