A manual of practical medical electricity : the Röntgen rays and Finsen light . external electrode ( unipolar method).Progress is slower here, but if the negative pole be theexternal one, the risk of sloughing is reduced to a mini-mum. The resistance of the skin is partly eliminatedThis method is adopted for some aneurisms, removal ofhairs, etc. 224 A Manual of Practical Medical Electricity 3. Both poles are in close apposition, but do not pene-trate the skin or mucous membranes. This method isused by Apostoli for uterine fibroids ; and in modifiedforms by others for strictures. General Requis
A manual of practical medical electricity : the Röntgen rays and Finsen light . external electrode ( unipolar method).Progress is slower here, but if the negative pole be theexternal one, the risk of sloughing is reduced to a mini-mum. The resistance of the skin is partly eliminatedThis method is adopted for some aneurisms, removal ofhairs, etc. 224 A Manual of Practical Medical Electricity 3. Both poles are in close apposition, but do not pene-trate the skin or mucous membranes. This method isused by Apostoli for uterine fibroids ; and in modifiedforms by others for strictures. General Requisites for Electro-Surgery. These are an ordinary galvanic battery of Leclanche,or other cells (large size preferable—for a portable battery,the Hellesen or other dry elements) ; a collector andcurrent reverser ; a milliampere meter reading to 150 ordinary work, and to 300 for Apostolis method ;a rheostat, rheophores, a large indifferent electrode, andothers of special shape for Apostolis method, as well asfor treatment of the urethra, lachrymal duct, Eustachian. Fig. 118.—Electrolysis Needle. tube, and the oesophagus ; needles of various sizes ofplatinum, gold, and steel (their stems should be insulatedby vulcanite sheaths to avoid injury to the skin, thoughpainting with ordinary shellac will be sufficient, providedit be renewed after every application) The needles shouldbe provided with arrangements permitting of their beingattached together to the same rheophore (Fig. 118). Theneedle attached to the positive pole becomes decomposedby the current, but platinum and gold are less affected bythis oxidation process than are other metals, and they aretherefore usually chosen for this purpose, unless thecaustic and heemostatic effects of the salts of iron aredesired. It is difficult also to give a platinum needle any-thing like a stable fine point, and its introduction is there-fore more difficult and painful than is that of a steel one. Electro-Surgery 225 Removal
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