Power operated rotary excision tool

A power operated dermatome comprising:

• an annular rotary knife blade supported for rotation about a central axis of rotation by a blade housing assembly;
• and
• the blade housing assembly including:
• an annular blade housing including an upper end and an axially spaced apart lower end and an inner wall and a radially spaced apart outer wall, the annular blade housing centered about an axially extending center line, the blade housing including a circumferentially extending skin deflector portion including a blade receiving body and a shield extending radially inwardly from the blade receiving body, the blade receiving body including a blade receiving channel extending axially upwardly from a lower surface of the blade receiving body and radially spaced from the inner and outer walls of the annular blade housing, the blade receiving channel includes a first wall, a radially spaced apart second wall closer to the axially extending center line of the blade housing, and a bridging surface between the first and second walls, the first wall includes a first generally planar portion extending substantially parallel to the axially extending center line of the blade housing and a second offset portion, the second offset portion defining a bearing surface extending transverse to the axially extending center line of the blade housing, the shield including an inner wall defining a tissue directing surface, the tissue directing surface including a first tissue guide surface extending upwardly from a lower end of the shield, the first tissue guide surface extending substantially parallel to the axially extending center line of the annular blade housing.