Book 7
26
A sandy stone is made evident before the operation by the sandy urine which is passed, and in the course of it, since it does not present a uniform resistance to the fingers in the rectum, and in addition it breaks up. Again soft stones and those composed of numerous small ones which only lightly adhere together, are indicated when the urine shows scalelike particles. All these should be brought out gently by changing as before the position of the fingers in turn, without injury to the bladder, yet so as not to leave behind in it any scattered remnants which will render the after-treatment difficult. When anything of this kind comes into view it is to be extracted by the fingers or scoop. And if there are several stones they are to be extracted one by one, but if a very small stone remains over it had better be left. For it is difficult to find it in the bladder, or when found it easily escapes again. In such a prolonged search the bladder is injured and fatal inflammations set up; so that some who have not been operated on have died after the bladder has been for a long while and in vain pushed about by the fingers. There is the additional reason that a small stone is later moved forward with the urine into the wound and so removed. If, however, at any time the stone appears too large to extract without tearing the neck of the bladder, it is to be split up; hence Ammonius the inventor of this process was surnamed lithotomus. This is done as follows: the scoop is passed over the stone, so that it easily keeps hold of the stone, even when it is struck; next an instrument is used of moderate thickness, its front end tapering yet blunt, and when this is put against the calculus, and its other end struck, it splits up the stone, great care being taken that the instrument does not come into contact with the bladder itself, and that no fragment from the broken calculus cuts into it.
