Implantable sacral nerve root stimulation system is mainly applied to the    SCI cone above in patients with spinal cord injury, by the mode of operation,         recovery of the bladder urine storage function, the active reconstruction of      bladder voiding function in patients with SCI, so as to achieve the elimination   of autonomous urination, urinary tract infection, reduce the incidence of kidney disease, so that patients get rid of dysuria urinary incontinence, distress, greatly improve the life quality of patients with SCI.