Specification of James Lee Hannah : surgical instruments.

  • Hannah, James Lee.
Date:
1857
Catalogue details

Licence: Public Domain Mark

Credit: Specification of James Lee Hannah : surgical instruments. Source: Wellcome Collection.

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    Hannah's Improvements in Surgical Instruments. teeth), are cut only transversely on the corresponding concave surface of the curve, as seen in Figure 9, Plate A, and fit in smoothly between those with which they come in contact, as is seen in Figure 8, of Plate A. This portion of the instrument forming the moving range or row of teeth has about half an inch of its extremity filed laterally, and drilled to form a tongue to be let in 5 at the extremity of the movable row of teeth, so as to be screwed or riveted together (as seen in Figure 9, of Plate A), and thus form a joint of easy motion, which joint serves as a fulcrum in the use of the instrument and renders it very powerful in its effect. To the other extremity of the moving range of teeth the same kind of flexible steel spring as used with the cutter is ^ secured by a screw or a rivet and made perfectly smooth. The shaft or handle of this crumbier is grooved like that of the cutter before described, and is in all respects similar to it, except that it is without the little transverse notch which the other must have. The flexible steel spring is let in (equal to its thickness) to the extremity of the moving range of teeth, as seen in 15 Figure 9, Plate A. It is then nicely screwed or riveted on to its place, and no roughness or pointed ness perceptible. The third kind of the parts of the apparatus which enter the bladder is this second kind of crumbier or crusher (made of the same material as the other) shewn by Figures 10 and 11, Plate A. It differs from the other 20 crumbier, Figure 9, in having but one range of teeth, and the flexible steel spring extending over them from the joint, as seen in Figure 10, Plate A, about eight inches beyond the extremity of the shaft or handle. This steel spring is over the curve of much greater breadth than those before-mentioned. It is the main spring of a chronometer, and just sufficiently covers the teeth 25 to prevent their wounding the urethra, being filed or ground down from the point where it leaves the curve. It is to be of the same breadth as the others when it enters the silver tube or sheath, and that breadth about three six¬ teenths of an inch resting on the flat surface of the shaft, which surface is about the same breadth, the sides of the shaft rounding out beyond the flat 30 surface. The joint of this instrument, as seen in Figure 11, Plate A, is made by filing a piece of steel to the exact shape to suit the form of the part into which it is to go as a tongue for the joint. Being thus filed or formed, there is to be about three eighths of an inch left at the end opposite the end of the tongue, and of double the thickness of the chronometer spring before men- 35 tioned, (but of the same breadth that the spring may be let down as far as its own thickness in it, and thus riveted, a continued smooth surface is formed, as if the whole thing had been made from one steel bar. This tongue riveted to its place completes the joint. All the parts entering the urethra and