Apparatus and method for diagnosing spinal disorders. Pairs, left and right, of symmetric dermatoms of a patient are individually excited by means of electrode pairs, and the 'time of flight' is determined for impulses to arrive to the cortex. Due to noisy signals, it is necessary to register a substantial number of individual waveforms, control their integrity, exclude questionable waveforms and sum those not excluded. The invention makes possible the diagnosis of spinal disorders where prior art methods have failed although the patient is in pain.
METHOD AND APPARATUS FOR MEASURING THE TRANSPORT TIME OF NERVE SIGNALS EXCITED IN DIFFERENT DERMATOMS OF A PATIENT