. Local and regional anesthesia : with chapters on spinal, epidural, paravertebral, and parasacral analgesia, and on other applications of local and regional anesthesia to the surgery of the eye, ear, nose and throat, and to dental practice. ~~- -• Sphincter muscle Fig. 108.—Schematic representation of method of producing anesthesia of anal canal—taken from Braun, slightly modified. Anesthesia results almost immediately, at most after a delay of afew minutes, when dilatation may be begun and can be as thoroughlycarried out as under a general Fig. 109.—Method of dilating rectum wit
. Local and regional anesthesia : with chapters on spinal, epidural, paravertebral, and parasacral analgesia, and on other applications of local and regional anesthesia to the surgery of the eye, ear, nose and throat, and to dental practice. ~~- -• Sphincter muscle Fig. 108.—Schematic representation of method of producing anesthesia of anal canal—taken from Braun, slightly modified. Anesthesia results almost immediately, at most after a delay of afew minutes, when dilatation may be begun and can be as thoroughlycarried out as under a general Fig. 109.—Method of dilating rectum with hand in cone shape. A graphic illustration of the method of making these injectionsis shown in Fig. 108. The author always prefers to use the hand as adilating medium, which is less likely to tear or lacerate the parts. 39° LOCAL ANESTHESIA using soap as the lubricating medium; first one finger is passed, thentwo and three, and, finally, the whole hand in a cone-shape is rotatedaround in a screw-like fashion (Fig. 109) until dilatation is is the method always used by Prof. Matas for dilatation and issuperior to any other. In operations for fistula, in addition to the above method of anes-thesia, which anesthetizes the anal canal and permits dilatation, thefistulous tract must also be anesthetized by injections made on eachside and beneath it, so as to thoroughly embrace it within a wall ofanesthesia. The method of making these injections is illustrated in
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