It involves two separate operations, a few weeks apart.

A temporary stimulator is put in first, followed by a "trial phase" (typically 2-4 weeks), and then a second procedure to either implant the permanent stimulator or remove the temporary one, depending on the success of the trial

The first operation will be done under sedation or general anaesthetic (put to sleep):

• A tiny cut in your lower back and a second 3 - 4 cm cut in the upper buttock

• An electrode (wire) is placed near the nerves using X-rays to make sure it is in the correct place; the wire passes out through the skin at the side of the buttock

• The wire is then connected to a stimulator box outside the body

• the stimulator box sends electrical signals to the nerves and needs to be worn all the time

The second operation:

• Only after 2 weeks of evaluations using several parameters/measurements will then decide if to proceed to the 2^nd stage of the operation. If not, the temporary stimulator will be removed during the second operation
  
• Similarly, it will be done under sedation or general anaesthetic (put to sleep)
• The cut in the buttock will be re-open and the permanent stimulator is placed under the skin
• May be able to go home on the same day, but an overnight stay is sometimes needed 
  

• ​Failure of the treatment to improve the symptoms significantly (common)
• Mild discomfort requiring simple painkillers (seldom)
• Need for replacement, relocation or removal of the implanted stimulator or electrode (wire) (seldom)
• Discomfort in the buttock, or lower back, at the site of the stimulator or its lead (seldom)
• Discomfort in the ankle or foot (Seldom)
• Infection in the wound requiring antibiotics and possible removal of the device (rare)
• Stimulation produces an adverse (undesirable) after-effect on the bowel function (rare)
  

​How long does the battery last?

The battery in the stimulator will run down eventually, usually after 3-7 years. Changing the battery is relatively simple, and involves a procedure very like the second stage of the original.

Sports and strenuous activities?

Due to the risk of damaging or dislodging the stimulator or the wire, advise not to take part in contact sports, extreme sports or horse-riding.

Electronic devices

Security screening and airport scanning devices can affect the stimulator.

Show the security staff the stimulator identification card and they may allow by-pass the scanner. Alternatively, turn off the simulator before going through the scanner.

Can I go for MRI scanning?

Should not go in an MRI scanner (other than for a head scan) after the implant, although some newer devices are MRI-compatible.