. Modern surgery, general and operative. d the tip of the catheter is en-gaged in the carrying tube of thecystoscope. As the catheter is fedthrough the cystoscope the linen bagis pulled back; in this way the fingersdo not come in contact with thecatheter. Ureteral catheters can be sterilizedby placing them in an open shallowdish containing a saturated solutionof ammonium sulphate or sodiumchlorid and boiling them for five orten minutes. The following precau-tions must be observed: Each cathetershould be wrapped in gauze and thebottom of the pan covered with the catheters are allowed t
. Modern surgery, general and operative. d the tip of the catheter is en-gaged in the carrying tube of thecystoscope. As the catheter is fedthrough the cystoscope the linen bagis pulled back; in this way the fingersdo not come in contact with thecatheter. Ureteral catheters can be sterilizedby placing them in an open shallowdish containing a saturated solutionof ammonium sulphate or sodiumchlorid and boiling them for five orten minutes. The following precau-tions must be observed: Each cathetershould be wrapped in gauze and thebottom of the pan covered with the catheters are allowed to toucheach other or curl upon themselves the shellac coating will melt and ruin the instruments. They may also be sterilizedin the same manner as the cystoscope, care being taken if formalin has been usedto wash away carefully the germicide, especially from the lumen of the catheter. Contra-indications to Cystoscopy.—The bladder must hold at the very least50 of fluid. If it holds less cystoscopy is useless. Examination is either. Fig. 948.—Different tj-pes of ureteralcatheters: a, Blasucci; h, return flow for irri-gation; c, Garceau; J, another type of Blasucci;e, Cunningham; /, olivary tipped; g, .r-ra}-whistle tip. I4SO Diseases and Injuries of the Genito-urinary Organs impossible or unsatisfactory if the prostate be greatly enlarged. Contractedmeatus urinarius and stricture of less caliber than No. 24 of the French scaleare correctible contra-indications. Papillomata and other tumors and foreignbodies of the urethra are impediments. In acute Brights disease instrumenta-tion is dangerous, because it may be followed by suppression of urine. The
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