Cyclopædia of obstetrics and gynecology . Fig. 151. Fig. 152. Figs. 151 and 152.—Tarxiers Cephalotribes. fact that its utility is limited to the lesser degrees of contraction. Tarniers Cei^halotrihe.—Tarnier has invented a number of cephalo-tribes. (Figs. 151-153.) One of his modifications is furnished with anumber of transverse projections to grasp and firmly hold the head; inanother he has addecl a perineal curve: in his last model he has modifiedBlots lock, so as to render it easier to adjust the compressing bar. [Lusk has devised an excellent and effective instrument, which presents 252 A
Cyclopædia of obstetrics and gynecology . Fig. 151. Fig. 152. Figs. 151 and 152.—Tarxiers Cephalotribes. fact that its utility is limited to the lesser degrees of contraction. Tarniers Cei^halotrihe.—Tarnier has invented a number of cephalo-tribes. (Figs. 151-153.) One of his modifications is furnished with anumber of transverse projections to grasp and firmly hold the head; inanother he has addecl a perineal curve: in his last model he has modifiedBlots lock, so as to render it easier to adjust the compressing bar. [Lusk has devised an excellent and effective instrument, which presents 252 A treatisp: on obstetrics. certain advantages over Blots. It has a cephalic curve of 2:^ inches. Thepelvic curve is a trifle beyond 3 inches in length. Tlie blades are fenes-trated, and are grooved on the inner surface. With this instrument it ispossible to grasp the head above the pelvic brim, and since, after the headhas been crushed, * the points approach each other closely, the instrument. Fig. 153. Fig. 154. Fig. Figs. , 154 and 155.—Tarniers Cephalotribes with Perineal Curve. becomes a perfect tractor, holding the head as securely as an ordinaryforceps. Its construction is, however, the abandonment of two favoritebut chimerical ideas regarding the capacity and mode of action of thecephalotribe, viz., that it is capable of flattening the head so that thelatter can be drawn through a ])elvis measuring but two inches in the con-jugate diameter, and that this can be accomplished by rotating the in- EMBRYOTOMY. 253 stiument, so as to make the flattened head correspond to the shorteneddiameter of the pelvis. (Lusk.) Lusks instrument, further, is lessbulky than any, actually so efl&cient, as yet devised.—Ed.] Indications.—Cephalotripsy is indicated vv^henever delivery is impossi-ble, without mutilation of the foetus. Benoit in his thesis, 1881, dividesthe indications into the following categories: 1. Those from the side ofthe mother, 2. Those from the sid
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