Cyclopædia of obstetrics and gynecology . the head, after Mme. Lachapelles method. Theforceps, when locked, will seize the occiput by its lesser curve directedtowards the left thigh of the mother. (Fig. 99.) The first tractionsshould aim at bringing the head down to the pelvic floor, and then it isto be rotated from left to right, to bring the occiput under the once accomplished, the instrument is symmetrical to head and to THE FOECEPS. 121 pelvis, and extraction is proceeded with as in case of occipito-pubic posi-tions. 4. Position it is impossible to grasp the head
Cyclopædia of obstetrics and gynecology . the head, after Mme. Lachapelles method. Theforceps, when locked, will seize the occiput by its lesser curve directedtowards the left thigh of the mother. (Fig. 99.) The first tractionsshould aim at bringing the head down to the pelvic floor, and then it isto be rotated from left to right, to bring the occiput under the once accomplished, the instrument is symmetrical to head and to THE FOECEPS. 121 pelvis, and extraction is proceeded with as in case of occipito-pubic posi-tions. 4. Position it is impossible to grasp the head in thebi-parietal diameter. One of the parietal protuberances correspondingdirectly with the posterior portion of the pelvis (sacro-vertebral angle),the other to the anterior portion, that is to say, to the symphysis, it isnot possible to apply the forceps symmetrically to the head. In case wetry, on the other hand, to apply symmetrically to the pelvis, we will graspthe head in the occipito-frontal diameter, the greatest of the head. We. Fig. 100.—Application of Forceps in aim, hence, to grasp the head in the diameter intermediate between thebi-parietal and the occipito-frontal. The left blade is agam first intro-duced to tiie left and behind, on the left side of the occiput. The rightblade, introduced the second, is first directed behind and to the right,and then brought spirally over the right frontal protuberance. The in-strument, when locked, faces the left thigh of the mother, (Fig. 100.)The lesser curve is, therefore, again turned, although not exactly, towardsthe occiput. First, tractions are to be made downward, to bring the headto the pelvic floor, and it is then rotated from^ left to right, to bring theocciput under the pubes. 122 A TREATISE OX OBSTETRICS. 5. Position —The occipito froiitiil diameter lies in the rightobhque of tlie pelvis. The occiput points to the left sacro-iliac synchon-drosis, the forehead to the right cotyloid cavity. The bi-p
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