LIGATION OF THE CAROTID ARTERY. 



93 



endanger the superior wall of the vessel or cause the lancet 

 to glide over the wall and not enter the vein. When the 

 lancet has entered the vein, extend the wound somewhat 

 toward the head by flexing the hand dorsally. In cattle it 

 is necessary to compress the vein by means of a cord tightly 

 drawn around the neck, the operator taking the same posi- 

 tion as in the horse while an assistant holds the animal by 

 the horns or nose, or the vein may be still more effectively 

 distended by causing the patient to press against a tightly 

 stretched cord with the base of the neck as advised for 

 intravenous injection on page 88. Close the wound as in a. 



Phlebotomy with the spring lancet is carried out in a 

 similar manner, the jugular being compressed in the same 

 way, and the lancet, with the spring set, placed over the 

 vein in such a way that the opening will be made in the 

 same direction and manner as with the fleams. The lancet 

 blade is then released and penetrates the vein. The com- 

 pression below is continued as in other cases. 



c. Phlebotomy with the trocar is performed in the same 

 manner as has been described for intravenous injection. So 

 long as the flow of blood continues the compression of the 

 vein must not be intermitted. The phlebotomy trocar 

 should be about 5 mm. in diameter. 



17. LIGATION OF THE CAROTID ARTERY. 

 Plate XVI. 



Objects. The control of hemorrhage from wounds or 

 the prevention of hemorrhage during the removal of tumors 

 or other operations in the parotid region. 



Instruments. Scissors, scalpel, tenacula, aneurism 

 needle, mouse-toothed forceps, ligation forceps, suture 

 material. 



Technic. The operation is possible on the standing 

 animal with the aid of cocaine or other local anaesthetic but 



