The science and art of obstetrics / by Theophilus Parvin.

  • Parvin, Theophilus, 1829-1898.
Date:
1886
Catalogue details

Licence: Public Domain Mark

Credit: The science and art of obstetrics / by Theophilus Parvin. Source: Wellcome Collection.

    634/720 (page 626)
    ments, or partial rotations, is an imperfect illustration of the pendulum and rotation movements. He regards rotation movements, as less efficient, and decidedly more dangerous than pendulum movements, but says that they may be useful when the position of the head is not known, as indicating the right direction for traction, and that of least resistance. This doctrine should be accepted not without hesitation, and yet, coming from such eminent authority, be rejected without just consideration. But in general the use of the forceps as a rotator is but exceptionally advisable, and frequently then the attempt is only an attempt—only an experiment. 5. The forceps as a tractor. Having thus considered the doubtful or occasional powers of the forceps, or powers that are only excep- tionally required, we come finally to the essential power of the instru- ment, that of traction. The pulling power made by means of the forceps is to be considered in reference to the force exerted; the line of direction of the pull, and as to whether this traction should be in- termittent or continuous. Fin. 185. Traction with the Common Fokcefs. .In easy labors the force exerted is probably, as stated by Mathews Duncan, little more than equivalent to the weight of the child; in difficult'labors it is very much greater, possibly amounting to fifty pounds, and in forceps delivery it is in some cases very much greater than even the latter. Delore makes the following statement as to the force that can be used with the forceps. A man without support, that is, not