Mono-polar, the first generation of RF technology, uses one electrode to deliver electrical energy and a return pad connected to the leg or back to close the electrical circuit. The electric current passes through a large part of the body so that there is no control over the depth of penetration and area affected.
The next generation, Bi-polar technology, uses two electrodes on the treatment applicator, with the current flowing between the two electrodes. This confines the treatment area somewhat, but still does not achieve effective treatment focus.
Since both Mono-polar and Bi-polar RF technologies are not focused, they usually require higher energy levels to achieve clinical results. The high energy heats the skin that is near the electrodes. This can cause pain and a higher risk of burns and skin damage. In addition, these older technologies require cooling mechanisms to mitigate these risks, which result in less efficient heating of the skin layers.
With Legend RF technology, controlled energy is delivered via three or more electrodes, centered between them, and limited only to the treatment area. This focused energy delivery results in improved treatment efficacy that provides immediate visible results from the 1st treatment. The treatment is painless and pleasant because of the relatively low power needed.