Portable cryosurgical apparatus

Claim 1

A portable cryosurgical instrument comprising: insulated container means having an upper end and a lower end; ''a quantity of cryogenic liquid within said container means having an upper level; removable closure means sealably engaging the upper end of said container means; first tubular means extending through said closure means and having one end thereof communicating with said cryogenic liquid below the upper level thereof for selectively transferring said liquid from said container to a spray nozzle means located at the other end of said first tubular means; means for selectively administering pressure through said closure means to the upper level of said cryogenic liquid to force said liquid through said first tubular means; direct response safety valve means on said closure means for venting said container to atmosphere when the pressure therein exceeds a predetermined level; and insulated handle means on said other end of said first tubular means near said nozzle means; whereby effective use is made of said cryogenic liquid so that numerous patients may be treated at different locations on one fill of cryogenic liquid.