A medical device for monitoring biological parameters through an Abreu BrainThermal Tunnel (ABTT) is provided. By monitoring and analyzing the temperatureof the ABTT, it is possible to diagnosis changes in a patient or subject undera varietyof conditions, including predicting the course of medical conditions.Furthermore,since the ABTT is predictive, analysis of the ABTT may be used to. controlmechanisms for safety when an impending medical condition makes such operationhazardous.