Devices and methods for fractional treatment of tissue

Abstract

A tissue treatment device and method comprising a plurality of spaced-apart elongated electrodes configured to receive radio frequency (RF) signal from an RF energy source and for be inserted into tissue at a plurality of depths. The elongated electrodes having a first polarity and a single flat electrode located having a second polarity. The single flat electrode is located in vicinity of the elongated electrodes and configured for contacting the tissue surface and for receiving the RF signal from the RF energy source. An actuating mechanism connected to the plurality of elongated electrodes and configured to move the elongated electrodes in two opposite directions into and out of the tissue. A controller as part of the treatment device configured to apply fractional treatment to the tissue, vary spatial density of the fractional treatment over a treatment period, operate the actuating mechanism to selectively move different elongated electrode sub-groups of the plurality of elongated electrodes according to a treatment time pattern.