DIVISION OP HARD TISSUES. 



99 



away by the stream of fluid. The curette is firmly grasped 

 and used with considerable pressure. The sharp edge of the spoon 

 quickly removes necrotic tissue whilst gliding over firmer healthy parts 

 without seriously affecting them. Particular care 

 must be taken to remove everything of a diseased 

 nature, without which rapid healing need not 

 be expected. 



The chisel and gouge, Figs. 126 and 127, 

 are now seldom employed for dividing bones 

 because of the danger of shattering the bone 

 when using the mallet or hammer. They have 

 largely been replaced by bone forceps, Fig. 131, 

 which are made with blades either at right 

 angles to the long axis of the forceps or parallel 

 with it. Each form has special uses. 



Saws are of several forms. The frame saw 

 (Fig. 132) consists of a blade, a frame, and a 

 handle. The blade is made somewhat finer 

 towards the back, so as to saw freely and not 

 become fixed in the furrow. It is secured at 

 one end by a screw for regulating the tension, 

 and at the other carries a small rivet which 

 prevents the blade slipping through the slot 

 into which it is introduced. The frame is either 

 quadrangular or semicircular. The handle was formerly provided 

 with depressions to fit the fingers. As, however, this rendered 

 it difficult to clean, modern saws are provided with plain curved 

 handles. 



Fig. 126. Fig. 127. 



A 



Fig. 128.— Curette. 



Fig. 129.— Curette. 



Fig. 130.— Flushing Curette. 



The nature of chain saws is almost sufficiently indicated by their 

 name. They consist of a number of articulated links, carrying on 

 one side saw teeth (Fig. 133). On account of their cost, however, 

 they are not much used in veterinary surgery. The end of the chain 



