Inhaltsangabe
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1885. Excerpt: ... slight, consisting in a little more or less width or curve in the blades, or in the nature of the lock or handle. In order that one may make a wise choice from the many kinds offered to him, he should consider what features are essential in any forceps, and of what form an ideally perfect instrument should be. The Blades.--Two curves in the blade are necessary, if the forceps are to be universally applicable, a head curve and a pelvic curve. The head curve is the one which allows the blade to be passed around a head, so that when traction is made, the head will not slip from between the blades. This curve must not be so great that the tips of the blades come close together, and prevent one from compressing the head. The difficulty in applying the forceps is directly increased by the amount of head curve. This has led to the making of the blades too flat in some instruments, so that with a large head there is great risk of their slipping oft'. The Davis forceps, and the instruments modelled after the same pattern, such as the Wallace, may be guaranteed not to slip. When once applied, they are securely fixed until removed by the physician. This is due in part to their sufficient head curve; partly to their pelvic curve, but also to a secondary head curve through the width of the blade, which is possessed by no other forceps. The Davis blades are also broader than in other forms, which, with the curves accurately moulded to the conformation of the fcetal cranium causes them to fit the head in a superior manner. This peculiarity in the Davis forceps, while it makes them the best possible instrument to apply upon the sides of the head, renders them less suited for an oblique application. They do not fit well when applied over the face and occiput, nor when ove...
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