Spinal cord electrical stimulation is mainly used to treat chronic intractable neurogenic pain. The main indications are: 1. Intractable low back pain after back surgery: Chronic low back pain ranks third among the most common chronic disabling diseases, after heart disease and arthritis. About 5% of people have low back pain once a year, and 60C80% of people experience low back pain during their lifetime. The prevalence of low back pain in the United States is about 8C56%, of which 28% experience chronic low back pain in their daily lives, 14% have had an episode in the past 2 weeks, and 8% are unable to work as a result. 35% require medication within the last 6 months. 2, Complex focal pain syndrome, such as pain after some peripheral nerve injuries. 3, peripheral ischemic pain, such as diabetic foot, Raynaud’s disease, etc. 4, intractable angina pectoris. 5, residual limb pain, phantom limb pain. 6, Other, such as postherpetic neuralgia, radiculopathy, arachnoiditis, etc. The incidence of herpes zoster is between 1.4 and 4.8 per 1000 of the population, and there is a tendency to increase gradually. About 10% of patients with herpes zoster can have postherpetic neuralgia, and the incidence of postherpetic neuralgia is highest in elderly patients over 60 years of age, reaching 50%-75%. As the population ages, the incidence of herpes zoster and postherpetic neuralgia will increase significantly. The acute phase of herpes zoster is associated with pain in more than 80% of patients, and the abnormal pain and nociceptive hypersensitivity of postherpetic neuralgia are more difficult to treat.