190 



OPERATIONS ON THE SKIN AND CELLULAR TISSUE. 



while others are in two or three sections, connected by screw joiats 

 (Figs. 219, 220, 221), and in some few instances fitted to handles 

 (Fig. 217). But however they may otherwise vary, they are in 

 the general form of a stiff, iron rod, with one lanceolated extrem- 

 ity, both edges sharp, and a large eye at the blunt end to receive 

 the tape. The lanceolated portion is slightly curved on the flat 

 side. There are also other forms designed for special objects, 

 among which may be mentioned one which is used for passing a 

 seton through the frog of the foot, and is therefore known as the 

 frog seton-needle. 



Fig. 232.— Prog Seton Needle. 



For small animals, such as the dog, the smaller sized straight 

 needles are often suitable, and the one which is used for making 

 the quill-suture is very convenient. 



Besides the seton needle proper, in its authorized and usual 

 patterns, occasions sometimes occur when to meet special require- 

 ments, a straight, pointed bistoury and a pair of scissors are re- 

 quired as adjuncts. 



Pig. 323.— QuiU Suture Needle. 



The operation of setoning is comparatively a bloodless one, 

 and the division of the cellular tissues through which the needle 

 passes is very often made without any hemorrhage. Yet there 

 are regions where more or less blood may subsequently escape. 

 A region, therefore, where the cellular tissue is abundant and 

 loose, is that which is most favorable for the introduction of 

 setons. 



The modus operandi is simple. The hair must be closely 

 cUpped from about the points selected for the two preUminary 

 punctures, one for the entrance and one for the exit of the needle, 



