Operative surgery . Fig. 33.—Isolation ring. Pig. 24.—Isola-tion forceps. 38 OPERATIVE SURGERY. to happen in cases when the stronger solutions have been applied to mucousmembranes. For this reason a combination of ethyl chloride and a mediumstrength solution of cocain may be employed to cause surface anges-thesia. The expedients devised for limiting the action of this drug areingenious and efEective. Elastic bandages of proper width, elastic ringsof suitable size to constrict an extremity, metallic rubber-covered rings(Fig. 23), and isolation forceps (Fig. 24) to constrict limited areas, areem
Operative surgery . Fig. 33.—Isolation ring. Pig. 24.—Isola-tion forceps. 38 OPERATIVE SURGERY. to happen in cases when the stronger solutions have been applied to mucousmembranes. For this reason a combination of ethyl chloride and a mediumstrength solution of cocain may be employed to cause surface anges-thesia. The expedients devised for limiting the action of this drug areingenious and efEective. Elastic bandages of proper width, elastic ringsof suitable size to constrict an extremity, metallic rubber-covered rings(Fig. 23), and isolation forceps (Fig. 24) to constrict limited areas, areemployed. Figs. 25 and 26 illustrate the preceding method. Regional Paianeural Infiltration AncestJiesia.—In this procedure theconstricting agent is placed about the digit or other portion of an extrem-ity and the needle is introduced at a short distance below the constrictedpoint and the tissues about the nerves are infiltrated with the fluid bymeans of superficial or deep injections, according to the depth of
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