A system of electrotherapeutics as taught by the International correspondence schools, Scranton, . part of the conducting-cords by which the current issent from the transformer to the cautery. The aim should be to have the cautery handle light andwell balanced, otherwise the delicacy of the operations, forwhich the cauteries, as a rule, are used, are interfered with. § 17 PHYSICS OF LIGHT AND CAUTERY 23 The metal handle should be well insulated from the end socketsinto which the conductors and cautery are inserted. Some handles are provided with an interrupter for startingand stopping the
A system of electrotherapeutics as taught by the International correspondence schools, Scranton, . part of the conducting-cords by which the current issent from the transformer to the cautery. The aim should be to have the cautery handle light andwell balanced, otherwise the delicacy of the operations, forwhich the cauteries, as a rule, are used, are interfered with. § 17 PHYSICS OF LIGHT AND CAUTERY 23 The metal handle should be well insulated from the end socketsinto which the conductors and cautery are inserted. Some handles are provided with an interrupter for startingand stopping the current through the cautery. This has someobjections, mainly this, that the hand of the operator has toperform an additional motion, which of necessity must inter-fere with the stability of the cautery. A better method wouldbe to use a foot-switch or to have an assistant do the starting orstopping of the current. 29. Cautery Snare.—For the removal of a greater quantityof tissue the electrocautery snare is used. The ordinary handle,as shown in Fig. 10, may also be used for operating this snare,. and is then provided with a little wheel by means of which theplatinum snare may be drawn up. This arrangement does notseem to be very satisfactory, as it is difficult to produce aneven pull and to prevent a certain jerkiness. In many opera-tions where the cautery snare is used, it is required to submitthe latter to a constant pull, and, in some cases, of considerablestrength. The handle, Fig. 11, is constructed with the aim offulfilling these requirements. Here the fingers are inserted inthe three rings, and by bending the fingers towards the thumb,the snare is drawn in with an even motion and with a speedthat can be easily regulated. When using the snare it shouldbe remembered that, while it is being drawn into the handle,its resistance is constantly decreasing. The resistance of thecircuit should, therefore, be correspondingly increased, other-wise there is danger of the platinum
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