Doppler ultrasound medical device used to aid in the detection of peripheral vascular disease and used in the detection of blood flow and obstetric applications; a medical device that is a cortical stimulator used in brain mapping, EEG monitoring and identification of critical brain structures; a monitoring neurodiagnostic system comprised of computer hardware and software used for the collection, analysis and display of neurodiagnostic data from a patient for use in sleep disorder therapy; ICU monitor for brain monitoring a medical device used for testing sleep disorders and monitoring sleep disorders and evaluating sleep disorders; transcranial ultrasound systems for diagnostic and monitoring of the brain including a module that connects the ultrasound system to a computer; a medical device for monitoring and diagnosing EEG brain waves; [ monopolar needle electrodes used for medical devices for monitoring patients' vital signs; ] fetal pulse monitor; fetal monitor for monitoring vital signs; and medical devices for performing vascular testing