the teachings herein will readily appreciate that various materials can be used to make the permeable material 0015 fig3 shows alternative embodiments of the first end of the catheter which allows for controlled delivery of the caustic agent fig3 a shows an embodiment which comprises a roll on ball 310 attached to the first end 113 b for applying caustic agent to the site of need fig3 b shows an embodiment which comprises a closed first end 113 c with a plurality of perforations 315 out of which caustic agent is ejected fig3 c shows an embodiment which has a permeable membrane 320 rigidly attached to the first end 113 d a number of conventional materials commonly used in the medical industry can be used to make the catheter 110 examples of such materials include but are not limited to polyvinyl chloride polyethylene polypropylene polyethylene terephthalate polyurethane polytetrafluoroethylene fluoroethylenepropylene or nylon or combinations thereof examples of suitable materials are disclosed e g in u s pat nos 6 165 166 4 707 389 3 561 493 the structural properties of the subject cautery device and catheter will be dictated by the intended use for example use of the subject cautery device with a flexible endoscope will require that the catheter is also flexible those skilled in the art will readily recognize appropriate materials for making such catheters to meet this requirement as well as in the case where.