. Principles of electro-medicine, electro-surgery and radiology : a practical treatise for students and practioners, with chapters on mechanical vibration and blood pressure technique . Localization of the current Since the current passes directly from one electrode to the other, andsince a small active electrode causes greater concentration of heat, withless current in a relatively shorter period than a large one, the heat canbe localized and concentrated at will, by the position and the size of theelectrodes, e. g., two large electrodes of the same size applied on theopposite sides of the pa
. Principles of electro-medicine, electro-surgery and radiology : a practical treatise for students and practioners, with chapters on mechanical vibration and blood pressure technique . Localization of the current Since the current passes directly from one electrode to the other, andsince a small active electrode causes greater concentration of heat, withless current in a relatively shorter period than a large one, the heat canbe localized and concentrated at will, by the position and the size of theelectrodes, e. g., two large electrodes of the same size applied on theopposite sides of the part treated will produce the same effect at eachelectrode and the uniform effect between them; while employing onesmall and one large electrode, the heat will be concentrated only at thesmall electrode (which is therefore called active). In order to prove that the heat produced by this current is more pro-nounced in the center of the tissues (between the electrodes) than atthe points where the electrodes are applied, it is only necessary to applytwo metallic electrodes to the opposite ends of a potato and to passabout 1000 milliamperes of current for three or four minutes. At the. Fig. 19—Application of Diathermy. end of this application, it is found that the outside of the potato, wherethe electrodes were in contact, has remained unchanged (raw) but oncutting the potato in half, it is noticed that the center is cooked. Sameexperiment may be performed on a piece of beef, liver, egg, etc. By means of diathermic currents being able to raise the local internaltemperature (without producing muscular contraction or ionic action)to a moderate warmth, and thereby create a suitable condition for heal-ing of various lesions; or, on the other hand, to increase the heat to suchan extent so as to dessicate or even carbonize the tissue, the field ofdiathermy is very large, both in medicine and surgery, and its applica-tion has, therefore, been divided into two branches, viz., Physiological
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectelectri, bookyear1917
