Cyclopædia of obstetrics and gynecology . Fig. 163.—Double Chain Sa-vt-Forceps of Tarnier. A, Key. B, Screw bringing together theblades. CD, Chain saw. EF, Ends of chain. GG, Ends of conducting rods. HI. Chain saw passingthrough openings. handle; where the pelvis is much contracted, a long time is requisite forcompletion of the operation; it is not an instrument for extraction; it isvery expensive. In case of extreme contraction, Barnes nses a serre-ncevd and a metal-lic cord, and has operated by means of these in a rachitic pelvis measuring EMBKYOTOMY. 269 not quite an inch in the sacro-pubic
Cyclopædia of obstetrics and gynecology . Fig. 163.—Double Chain Sa-vt-Forceps of Tarnier. A, Key. B, Screw bringing together theblades. CD, Chain saw. EF, Ends of chain. GG, Ends of conducting rods. HI. Chain saw passingthrough openings. handle; where the pelvis is much contracted, a long time is requisite forcompletion of the operation; it is not an instrument for extraction; it isvery expensive. In case of extreme contraction, Barnes nses a serre-ncevd and a metal-lic cord, and has operated by means of these in a rachitic pelvis measuring EMBKYOTOMY. 269 not quite an inch in the sacro-pubic diameter. He thus describes hismethod: Even as in cephalotripsy, it is useful first to perforate. Itfurther facilitates the operation to twist off a portion of the parietalbones by the cranioclast. The wire loop thus buries itself more deeply,and it cuts its way through more readily. If the sphericity of the head. Fig. 164.—Barnes Operation op Lamination by the ficRASEtm. is not first destroyed, the wire loop is apt to glide off the head^ seizingonly the scalp when the screw is worked. The crotchet is next passedinto the hole made by the perforator and held by an assistant, so as tosteady the head. (Fig. 164.) A loop of strong steel wire is th^n formedlarge enough to encircle the head. The loop is guided over the crotchetto the side of the uterus where the face lies. The compression being 270 A TREATISE ON OBSTETRICS. removed, the loop springs open to form its original ring. This is guidedover the anterior part of the head (See Fig. B). The screw is then tight-ened and the wire is buried in the scalp. The whole force of the man-ceuvres is expended on the foetus; there is no outward pressure on the waA Fig. 165.—Huberts Perfora-tor (Terebellum.) Fig. 166.—ProtectingBlade. Fig. 167.—Huberts Transforator.(Complete.) maternal parts, as is inevitable with the cephalotribe or Van Huevelssaw-f
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