Methods and devices retract tissue for minimally invasive surgery in a patient. The plate comprises on a substrate a photosensitive layer soluble or dispersible in ink andor fountain solution and capable of hardening upon exposure to a laser. 5-2 fluid ounces of lime juice; about 1 fluid ounce of aloe vera juice; and about 4-6 fluid ounces of cranberry juice. In another exemplary embodiment, an apparatus for transporting a sheet material generally includes a frame, at least one wheel coupled to the frame for allowing rolling movement of the frame, and an adjustable vice coupled to the frame for securing a sheet material in the vice on the frame.