DEVICE FOR THE DETERMINATION OF PERIPHERAL REGIONAL ANAESTHESIA USING CONTACTLESS PHOTOPLETHYSMOGRAPHY

摘要

The invention relates to anaesthesia and, in particular - to the determination of efficiency of human anaesthesia and for registration the same, using contactless photoplethysmography (PPG) equipment. The device for contactless determination in real time of the effect of regional anaesthesia comprises a light source adapted for irradiation of the skin surface being anaesthetized with white light, a three-color RGB light-sensitive sensor-matrix adapted for image converting into digital format, assigning each image pixel the determined RGB value range, a device's memory, adapted for the storage of said value range, an analysis unit adapted for calculation of photopletizmographyc signal (PPG) amplitude from the green G colour channel video signal at each cardiac cycle, and for PPG average median values calculation from it in the specified time interval, an analysis block adapted for recording the effect of anaesthesia according to PPG amplitude changes, an output device designed for displaying time chart or numerical values of PPG amplitude, a control unit, which is connected with the light source, the light-sensitive sensor-matrix and the analysis unit, and adapted to control their operation.