According to the Classification Catalog of Medical Devices issued by the State Drug Administration of China, medical devices are equipment, apparatus, instruments, materials or other articles used for the prevention, diagnosis, treatment, monitoring or alleviation of disease. And the nurse's watch is a timekeeping tool used by nurses in their work, mainly used to record the patient's vital signs and the time of medical operations. The nurse's watch does not have the function of preventing, diagnosing, treating, monitoring or alleviating diseases, and therefore does not belong to the category of medical devices.