Useful. Qi-blood health-preserving instrument is an external product made according to the meridian theory of traditional Chinese medicine, which can improve the damage caused by various chronic diseases, has a good auxiliary effect on conditioning chronic diseases, and can also relieve and treat scapulohumeral periarthritis, prostatitis, degenerative arthritis, periodontitis and so on. It can also treat various nervous system diseases, such as sciatica, neurasthenia or insomnia. Therefore, the qi and blood energy health preserving instrument is useful for chronic diseases.