US Patent 6960202 Hand-held apparatus for spray cryotherapy

A self-contained cryotherapy apparatus adapted to be operated with one hand, using flashing temperature of a cartridge liquefied gas (CO2) sprayed in partly solid phase onto the epidermis. The cartridge support and the ejection and expansion system are aligned therewith and in the axis thereof, inside a housing whereof the median part acts as handle to be grasped by the adult user's hand, whereof the upper part includes an input for inserting the cartridge with its head down and into the housing axis and striking it or for removing it after use, and whereof the lower part includes a calibrated opening forming a passage for the sprayed gas substantially in the housing axis and elements for controlling its effect on the epidermis.