Operative surgery . t in view,the attendants must be instructed inthe details of making the pressure,and be thoroughly acquainted withthe necessity of constant vigilanceand of instant and efEective action. The circulation of a vessel that isinaccessible to proper digital com-pression, as the subclavian, can becontrolled often by the handle of akey, or by a short crutch, and theapplied extremity of either shouldbe covered with some soft material,to prevent injury to the vessel andthe superimposed soft parts. The Instrmnental Pressure. —Under this heading are included thevarious forms of tourniq
Operative surgery . t in view,the attendants must be instructed inthe details of making the pressure,and be thoroughly acquainted withthe necessity of constant vigilanceand of instant and efEective action. The circulation of a vessel that isinaccessible to proper digital com-pression, as the subclavian, can becontrolled often by the handle of akey, or by a short crutch, and theapplied extremity of either shouldbe covered with some soft material,to prevent injury to the vessel andthe superimposed soft parts. The Instrmnental Pressure. —Under this heading are included thevarious forms of tourniquets and suchother devices as are not directly con-nected with the adjustment of liga-tures to bleeding vessels. The tourni-quet commonly used was devised by Petit, and it is no doubt familiar to all(Fig. 87). It should be cautiously applied, with the pressure so directed asto crowd the vessel against the bone when possible (Figs. 88 and 89). Asimple and effective tourniquet can be extemporized by placing a roller. Fig. 87.—Petits tourniquet. AGENTS FOR THE CONTROL OF 73 bandage over the site of the vessel and confining it in position by a hand-kerchief passed around the limb. If ihe handkerchief be then tied andtwisted by a stick, the circulation will be controlled (Fig. 90).
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