A wound healing system comprising an array of electrodes incorporated in a device for applying an electrical signal to a wound. The electrodes are configurable to form at least one composite electrode and the electrical signal is applied to the wound via the composite electrode(s). The system preferably includes means for determining the state of the wound, the electrode composition of the composite electrode(s) depending on the determined state of the wound. Advantageously, the electrode composition of the composite electrode(s) is adjustable in response to changes in the determined state of the wound.
