An epidural is a continuous infusion of pain relief medicines given into the epidural space. This is an area close to the spinal cord and to the nerves supplying the area of surgery. This page from Great Ormond Street Hospital (GOSH) explains about the use of epidural pain relief after an operation, how it works and what to expect when your child has epidural pain relief.
Transcutaneous electrical nerve stimulation (TENS) is a safe, easy to use, drug-free method of managing pain. A very low level electrical current is applied to areas of the body using soft gel pads that stick to the skin. The low level electrical current stimulates nerves in the body that help to reduce pain. This information sheet from Great Ormond Street Hospital (GOSH) explains about the use of TENS and how it works
A bone anchored hearing aid (BAHA) is similar to other hearing aids, but instead of being inserted into the ear canal or held behind the ear, it is attached to a soft band worn on the head or fixed to a metal implant inserted into the skull. This page from Great Ormond Street Hospital (GOSH) describes the type of BAHAs used at GOSH, what is involved in fitting them and what to expect during treatment.