US Patent 10022146 Power operated rotary excision tool

An exemplary hand-held, power operated dermatome comprises a blade housing assembly, a skin deflector, an annular rotary knife blade, a cutting plane, and a depth gauge. The rotary knife blade has an inner region, an upper body portion, and a lower cutting portion. The lower cutting portion has an inner surface, an outer surface, and a bottom surface. A cutting edge of the rotary knife blade is formed by the intersection between the inner surface and the bottom surface of the lower cutting portion. The cutting plane of the dermatome is defined by the cutting edge of the rotary knife blade, and the depth gauge is disposed within the inner region of the rotary knife blade.