language or necessary implication the word u201c comprise u201d or variations such as u201c comprises u201d or u201c comprising u201d is used in an inclusive sense i e to specify the presence of the stated features but not to preclude the presence or addition of further features in various embodiments of the invention the term u201c stimulates the lymphatic system u201d in the broadest aspect of the invention and the broadest claim encompasses any electrical stimulation modality which has been shown to specifically enhance performance of the lymphatic system such as for example may be evidenced by reduction of lymphoedema in patients the term includes electrical stimulation modalities that may stimulate the lymphatic system in addition to stimulating skeletal muscle or producing other biophysical or biochemical effects as stated above while the present embodiments of the invention focus on dominant low frequencies in the 1 5 hz to 2 5 hz range and particularly wave shapes comprising pulses separated by rests the broadest aspect of the invention is the realisation that mobilisation of lymph using electrical stimulation is unexpectedly effective in healing ulcers which has not been suggested by previous published investigations into the use of electrical currents in healing ulcers and has not been explored accordingly other waveforms that are found in the future or have been previously identified if any to stimulate the.