SUEGICAL HEMOSTASIA. 525 



2d. Compression with the Circular Ligature. — Either a band- 

 age or a circular string of sufficient strength may be employed in 

 this method. If needed upon the leg, it should be placed upon 

 the lower part of the limb, either dry and moderately tight, or 

 moistened with cold water. If kept in place for a certain, length 

 of time previous to an operation, the effect wUI be to so reduce 

 the force of the circulation in that part as to render the perform- 

 ance comparatively a bloodless one. This proceeding is often 

 associated in veterinary practice with the operation of neurotomy. 

 In operations upon the foot, comparatively perfect hemostasia 

 may be obtained by circumscribing the coronet with a Ugature 



Fig. 454.— The Adstrictor of Brogniez. 



formed of a strong circular string, tightly drawn, but as a substi- 

 tute for this, a special instrument has been invented by Brogniez, 

 which he calls the adstrictor, which secures the same results. 



3d. Compression by the Tourniquet. — The adstrictor of Brog- 

 niez is but a peculiar form of tourniquet, which is composed of 

 two oval cushions or pads supported by metallic plates, and se- 

 cured on the inner face of a circular band adjustable as to its 



Fia. 455.— Tourniquet. 



length, and secured by a common buckle. This band is buckled 

 around the leg, and the pressure is made by the pads, which are 

 laid directly over the course of the vessel. 



4th. Compression by EsmarcKs Method. — Another mode of 

 compression, borrowed from human surgery, that of Professor Es- 

 marck, is designed to wholly prevent the loss of blood, and enable 

 the surgeon to perform a perfectly dry or bloodless operation. It 



