Operative surgery . 67.—Kcyessstraight evacuat-ing tube andguide. Fig. 1368.—Keyesscurved evacuat-ing tube andguide. 1170 OPERATIVE SURGERY. air in the catheter while it is thus located will, if fluid be forced gentlyinto it, pass upward through tlie fluid in the washer to the air trap above,from which it is excluded before the evacuating tube is carried on intothe bladder. If now the elastic bulb be alternately slowly compressed andexpanded, the changing current thus produced will wash the fragmentsfrom the bladder, and their weight will precipitate them into the glassreceiver beneath (Fig. 1
Operative surgery . 67.—Kcyessstraight evacuat-ing tube andguide. Fig. 1368.—Keyesscurved evacuat-ing tube andguide. 1170 OPERATIVE SURGERY. air in the catheter while it is thus located will, if fluid be forced gentlyinto it, pass upward through tlie fluid in the washer to the air trap above,from which it is excluded before the evacuating tube is carried on intothe bladder. If now the elastic bulb be alternately slowly compressed andexpanded, the changing current thus produced will wash the fragmentsfrom the bladder, and their weight will precipitate them into the glassreceiver beneath (Fig. ). After expansion of the bulb is Fig. —Showing the manner (^f holding the bulb. The left hand hold- ilie weightwhile the right manipulates it. an interval of a few seconds sliould elapse before pressure is again made,in order to allow all of the fragments in the tube to drop into the the outflow cease suddenly, the entrance of the tube is likely blockedwith a large fragment, or by the sucking in of the mucous membrane. Ifall the fragments be not removed—which can be ascertained by the intro-duction of a searcher, or known by the click of a fragment against theevacuating catheter at the time of washing, and by the audiphone—theprocess of crushing is again resorted to, and the resulting comminutionstreated as before until the entire stone is removed. The last fragments notinfrequently elude the grasp of the instrument, and, were it not that theycan be heard to strike the evacuating catheter when the water flows out-ward, their existence might not be known. If the curved tube be used thebeak shou
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