586 



INSTRUMENTS FOR RUMENOTOMY. 



To prevent food infecting the peritoneal cavity, Sajoux as early as 

 1839 employed a trocar with movable wings by wbicb to fix the rumen 

 to tbe abdominal wall (Hering) ; about the same period three instruments 

 termed " gastrotomes " were constructed by Brogniez. 



Fig. 410. — Brauer's trocar. 



Fig. 417. — Forceps for use with 

 Brauer's trocar. 



In Germany this complicated piece of apparatus was never much used, 

 because it by no means absolutely prevents infection of the peritoneal 

 cavity ; on the contrary, as it requires great care and cleanliness 

 to keep it in perfect condition, it is frequently 

 unavailable when most wanted. 



The trocar constructed by Brauer (Fig. 416) 

 appears simpler and more practical. Its can- 

 nula is so wide that the food may be removed 

 through it from the rumen by using a pair of 

 forceps. The handle and the greater part of 

 the stilette consist of wood ; the latter is 

 flattened, and ends in a cutting part, which is 

 formed by the union of two knife-shaped portions of steel, which come 

 together in a point. The cannula is of tinned iron, and has at its upper 

 part an opening 4 J inches long in one direction and 1J inches in the 

 other ; below, the aperture measures 4 inches in the one, and If in the 

 other direction (Fig. 418). The hair is cut from the seat of operation, 

 the skin cleansed, and the instrument applied like a trocar, but as it 



Fig. 418. 

 Sheath of Brauer's trocar, 



