TRACHEOTOMY. 



165 



extent of about three inches, and to introduce a curved 

 tracheotomy -tube, of some such shape as the following : 



Fig. 1. 



Fig. 2. 



Fig. 3. 



The tube. 



The tube and shield 

 (front view). 



The tube and shield 

 (side view). 



It has a shoulder with perforations for tapes, which are to be 

 fastened round the neck. He says he never knew roaring 

 follow the operation, which may be owing to his not excising 

 any of the substance of the trachea. I felt the neck of one 

 horse that had been so operated on, and found a cartilaginous 

 ridge running longitudinally where union had taken place. 

 The tube might be better adapted for the slit in the windpipe 

 by making its mouth of an oval instead of a circular form. 



^^^^/ta 



pi^ei>ry^^ 



