The mechanical ventilator system is a compact and portable artificial respiration system. A vortex ring generator delivers a FiO2 mix from an air-oxygen blender to a patients alveoli via an endotracheal tube during the s patients inhalations, but remains idle during the patients exhalations. Exhaust gases generated by the patient are released through an exhaust gas valve. During operation, the patients oxygen saturation level is measured and kept in communication to receive oxygen saturation level signals and to control the oxygen proportion of the FiO2 mix. A pressure flow sensor is fluidly coupled with the patients airway to control actuation of the vortex generator. The flow sensor is coupled with a controller, which actuates a vortex generator trigger circuit in communication with the vortex ring generator.