Patent ID: 8226663

Claim:
A microdermabrasion hand piece comprising: an elongated body portion having a particle supply channel and a waste removal channel extending lengthwise, parallel to a longitudinal axis, through the body portion; a removable tip attachable to a proximal end of the body portion, the removable tip defining a treatment orifice; the particle supply channel being oriented to direct a stream of abrasive particles, which are drawn into and guided through the particle supply channel, substantially toward a center of the treatment orifice; and an automatic vacuum relief valve assembly including an axially-movable skin probe oriented centrally in the hand piece and generally parallel to the longitudinal axis of the hand piece, the axially-movable skin probe being movable in response to skin contact, wherein the hand piece provides automatic limitation on skin extension, wherein extension of the skin in the treatment orifice beyond a predetermined limit is prevented and excessive extension of skin of various thicknesses is eliminated.