The principles and practice of obstetrics . Holmes Perforator. handles to be bent so as to cross each other. Theadvantage of this modification is, that the practitionercan, by one hand, open the blades so as to incise thecranium without the aid of an assistant. Another more important modification is made by , of Paris, which is thus described by Cazeaux: This craniotome is composed of two blades, whichcover each other so that when the instrument is closedthe blunt edge of one extends slightly beyond the cut-ting edge of the other, and reciprocally. Each free surface bears at its extremit
The principles and practice of obstetrics . Holmes Perforator. handles to be bent so as to cross each other. Theadvantage of this modification is, that the practitionercan, by one hand, open the blades so as to incise thecranium without the aid of an assistant. Another more important modification is made by , of Paris, which is thus described by Cazeaux: This craniotome is composed of two blades, whichcover each other so that when the instrument is closedthe blunt edge of one extends slightly beyond the cut-ting edge of the other, and reciprocally. Each free surface bears at its extremity a projectionwhich gives to the point of the instrument a quadran- Fig. Blots Cephalotome. branch, and limits the motion in one direction, while aspring limits it in the opposite direction. The twobranches are articulated, (a tenon,) which admits oftheir being readily dismounted. The advantages of this modification are, First. They can be used simply as a trocar for per-foration. Second. The cutting edges being concealed, they maybe readily introduced without danger to the tissues ofthe mother. Third. By acting with one hand upon the handles,the instrument can be used as scissors; and, Fourth. As soon as the pressure upon the handles isremoved, the spring closes the scissors, so that theycan be taken away with safety to the mother. Theyare thus a decided improvement upon Smelliesscissors. The German and Belgian practitioners have em-ployed a trephine to perforate the cranium. The tre-phine (Plate XVI., Fig. 95) is concealed in a bentcylinder, and connected with a handle by means of achain. The cylinder being passed up to the cranium,the trephine is projec
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