One embodiment of the present invention is a load floor for attachment to a rear portion of a vehicle floorpan. A drive mechanism converts rotary output of the motor into a reciprocating motion of the piston. The flap, which covers the insertion slot when the cover is closed, serves as a support base when in the open position to incline the housing when the reading device is placed on a support surface such as desk or table. In use, the composite prosthesis is positioned over the tissue defect and may be positioned with the barrier material oriented against the tissue defect or repair site.