Desenvolvimento de um protótipo para monitoramento visual neurofisiológico intraoperatório.

Abstract

Intraoperative neurophysiological monitoring (MNIO) is a methodology that combines different neurophysiological tests for simultaneous or alternating in the same patient during the surgical procedure can evaluate the clinical neurophysiology in three fields: electroencephalography (EEG), electromyography (EMG) and evoked potential (EP). The visual evoked potential (VEP) evaluates the function and integrity of cortical and subcortical structures of the visual pathway. This test is performed daily in neurophysiology laboratories, helping the clarifying of different types of bouts vision, whether by disease or trauma. This study aimed to develop a prototype for monitoring the VEP to assess the integrity of the visual pathways during neurophysiological surgeries. Several steps were performed for the prototype ocular device: computer simulation; study of the characteristics of the human eye; rapid prototyping; Biopolymer characterization of polylactic acid (PLA) used in prototyping; development of an ocular device prototype with integrated lighting system and VEP achievement tests with the prototype. The PLA used in the prototype for the development of parts of the device eye was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), optical microscopy (OM), Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS), these results showed that the rapid prototyping did not change the physical-chemical and morphological PLA. The computer simulation provides appropriate parameters for the development of ocular device that allowed greater efficiency in the assembly of electronic circuit. The results of ENP tests were performed in different patients, with closed eyes and have shown promise for use in anesthetized patients.