A company named BioElectronics has developed a device that is meant to reduce swelling and inflammation after surgery and injury. It is a patch that delivers pulsed electromagnetic energy to the site of injury through the skin.
The question is, 'Does it work?" Hard to tell. There do not currently seem to be any large-scale, double-blind, controlled, prospective studies in the literature on this specific device. This is commonly the case with many devices and products of this nature. But there is some degree of scientific rationale for the ActiPatch.
Here is what the company has to say about it: "When soft tissue is damaged the cells separate to prevent the transmission of infection. The cells leak fluid and cellular components break down while the cellular debris causes inflammation, swelling and pain. ActiPatch stabilizes the leaking cell membranes by, in effect, recharging the membrane. The pulsed energy delivered by ActiPatch drives out the edematous fluid along with the by products of the damaged tissue."
Skeptical? Check it out for yourself, here.