262 



CANINE AND FELINE SURGERY 



of a special catheter and an evacuator (Fig. i68). If the 

 urethra can be sufficiently dilated the stone may be removed 

 intact. The urethra may even be incised, a director and fine 

 bistoury with blunt point being used for the operation. 



Mr. A. J. Sewell' records one case in which he was able to remove a 

 stone about the size of a hazel-nut, without breaking it, after enlarging the 

 urethra with a small bistoury. 



Mr. H. Gray^ had a similar experience with a very fat, small fox-terrier 

 bitch, ten years old, digital examination per vaginam revealing a calculus 



Fig. 1 68. — Thompson's Evacuator. 



as large as a marble in the urethra, and upon manipulating it with one 

 tinger in the rectum and one in the vagina, seven small calculi, each about 

 the size of a tare, shot out. The large calculus could not be extracted 

 until the urethra had had a vertical incision made down upon it. 



After-treatment must depend a little upon the progress 

 made. Diet should be of an easily digestible character and 

 sparing in quantity, the supply of fluids being limited for the 

 first three or four days. 



' Veterinary Record, vol. xi., p. 510. 



' Journal of Comparative Pathology and Therapeutics, vol. .\., p. 87. 



