Medical apparatus and instruments, namely, medical apparatus and instruments for electroencephalography monitoring; medical apparatus, electrodes and instruments for use in neurodiagnostics, electrocardiography, electroencephalography, electromyography, polysomnography, and electrostimulation; medical electrodes and needles for injections; electromedical diagnostic instruments, namely, electromedical diagnostic instruments for neurodiagnostics, electrocardiography, electroencephalography, electromyography, polysomnography, and electrostimulation monitoring; medical sensor for monitoring patient vital signs; conducive polymer gels and creams sold only as a component of medical electrodes for use in neurodiagnostics, electrocardiography, electroencephalography, electromyography, polysomnography, and electrostimulation