Preparatory and after treatment in operative cases . Fig. 50.—Apparatus for SterilizationCatgut by the Cumol Method. ABSORBABLE LIGATURE MATERIAL 93 brittle during the subsequent steps of its preparation, the resultof conversion of the animal tissue into a glue-like substance. The gut is then submerged in cumol, and the temperature raisedto 155° C. and maintained for one hour. The cumol is then drawnoff through a tube at least 24 inches in length attached to the lowerspout (Fig. 50), and the rest of the cumol driven off by main-taining a temperature of 100° C. for about two hours. The gut is t
Preparatory and after treatment in operative cases . Fig. 50.—Apparatus for SterilizationCatgut by the Cumol Method. ABSORBABLE LIGATURE MATERIAL 93 brittle during the subsequent steps of its preparation, the resultof conversion of the animal tissue into a glue-like substance. The gut is then submerged in cumol, and the temperature raisedto 155° C. and maintained for one hour. The cumol is then drawnoff through a tube at least 24 inches in length attached to the lowerspout (Fig. 50), and the rest of the cumol driven off by main-taining a temperature of 100° C. for about two hours. The gut is then removed and stored in either glass tubes orjars (Fig. 49). The gut in the jars is covered with a solutionof mercuric biniodid, 1 in 1,000. The latter precaution is takento prevent contamination of the gut when removing a portion ofthe contents of the jar. The objection to storing sterilized catgut in jars, for fear ofsubsequent contamination, has been overcome by placing the pre-. Fig. 51.—Sterile Catgut in Hermetically Sealed Glass at file scratch. Tube pared suture and ligature material in hermetically sealed glasstubes. The gut is coiled or wound on a metal bobbin, placed in theglass tube, and after being sterilized in cumol, as described, at atemperature of 300° F. for two hours, the tube is sealed and re-sterilized for one hour at 18 lbs., in a steam pressure sterilizer(Fig. 21). This is an ideal way of handling catgut. The glass tube is scratched with a file mark near its middle,and when the tube is opened it is readily broken at this point (). A sterile towel should be used for the purpose to prevent in-jury from the broken glass to the surgeons fingers. In this waycontamination of the material during transportation is made im-possible, and it is only necessary to sterilize the outside of the tubeat the time of the operation. 94 SUTURE AND LIGATURE MATERIAL The latter object is attained by sterilization by boiling simul-taneously wi
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