According to the company, the largest portion of the professional cryosurgical market consists of two basic product categories: Liquid nitrogen-based delivery systems used mainly by dermatologists that require frequent refills due to evaporation, as well as the portable devices including Histofreezer
and Verrucae Freeze that are disposable can-like devices used by paediatricians and general practitioners.
Less effective versions include Verruca-Freeze (chlorodifluoromethane and propane), Histofreezer
(dimethyl ether and propane), or Wartner (dimethyl ether and propane), which produce less than half the chill of liquid nitrogen, she said.
Other new treatments for external genital warts include Histofreezer
(OraSure Technologies Inc.), a prepackaged portable cryosurgery unit that consists of a handheld canister of cryogen and a variety of applicators.