Embodiments described herein provide systems and methods for inserting a spinal stabilization rod. The lighting device has two separate heat sinks, a light source heat sink 112 to which the light source is thermally coupled, and a driver heat sink 115 to which the driver is thermally coupled. A third layer includes a combination of the first and second layers between the first and the second layers, the third layer having a third etching rate lower than the second etching rate. In the method for RF tissue treatment, the introducer is introduced into the tissue of a subject. The column drive circuit writes image signal originally assigned to a frame into the pixels for the preceding sub-frame, and then writes an image signal for adjusting image quality into the pixels for the following sub-frame. The blade includes orifices situated under the blade root via which the cooling fluid penetrates, and an adjustment plate including holes situated in register with the orifices, the adjustment plate having a coefficient of expansion that is different from the coefficient of expansion of the blade root.