Swan Physio has machines suitable for home use on sale.
Small sticky pads on the skin transmit electrical impulses through to the nerves to promote pain relief (analgesia).
Depending on the settings this achieves different effects ranging from blocking pain signals going to/from the brain to encouraging the body to release hormones which reduce sensitivity of the nerves in a painful area.
This is an excellent treatment which can be used at home, as directed by a medical professional.
Swan Physio has machines suitable for home use on sale, for under £30.