A sacral anterior root stimulator is an implantable medical device enabling patients with a spinal cord lesion to empty their bladders.
This device is implanted over the sacral anterior root of the spinal cord; controlled by an external transmitter, it delivers intermittent stimulation which improves the ability to empty the bladder.
It may also assist in defecation and also may enable male patients to have a sustained full erection.
The device is implanted in one of two regions, either through intrathecal administration or extradurally.
The related procedure of sacral nerve stimulation is to control incontinence in otherwise able-bodied patients.