OPERATIOKS ON THE (ESOPHAGUS. 



367 



and in dogs, it is often of great 

 advantage. The operation would 

 naturally depend very largely for 

 its success upon the size of the 

 foreign body, which of course is a 

 variable circumstance, and also on 

 the condition of its external sur- 

 face, whether rough or smooth, or 

 having projecting poiats ; depend- 

 ing much likewise on the situation 

 in the length of the canal, and 

 whether it has become engaged in 

 the cervical or the thoracic portion 

 of the passage. 



Probangs for the throat and a 

 speculum for the mouth are instru- 

 ments necessary for this operation. 



There are various forms of pro- 

 bangs, the designs of different iu- 

 ventors. The first, which, accord- 

 ing to Brogniez, was invented by 

 Monro of Edinburgh, has been 

 more or less perfected. The pro- 

 bang of Baujin (Figure 363) is re- 

 versible, and may be so adjusted 

 as to either push down or extract 

 the offending substance from its 

 place of lodgment. The instru- 

 ment in ordinary use is designed 

 essentially to push the obstruction 

 through the passage. It is found 

 in all our surgical instrument ma- 

 kers' shops, and is made of whalebone or of rubber, separable in 

 two parts, connected by a screw. One end (Fig. 364) has a bulb- 

 ous enlargement, the other a blunt mass or head, made concave 



Fig. 363.— Baujin's Probang. 



Fia. 364.— Ordinary Whalebone Probang. 



