Cutting implement and method of making same

Details Cutting implement and method of making same Cutting implement and method of making same

C - Chemistry, Metallurgy

23

F

30/41, 149/5, 30

C23F 1/00 (2006.01) A61B 17/32 (2006.01) B26B 21/58 (2006.01) A61F 2/00 (2006.01)

Patent

CA 1243588

ABSTRACT A cutting tool, preferably in the form of a scalpel, microtome or razor blade is fabricated from single crystal mater- ial such as aluminum oxide with a preferential etching process to produce a radius of curvature less than 100 Angstroms on the edge. Depending upon the etchant, the crystallographic orient- ation of the blank and the resulting different etch rates on blade surfaces, the preferential etching process not only sharp- ens a preformed edge but also, in one embodiment, produces an opposing edge which meets the sharpened edge at a point, thereby to produce a particularly efficient scalpel blade configuration having two cutting edges converging at a point for plunging and cutting. With respect to the sharpening of the cutting edge, consistent with all other blade forming requirements, the subject blade is made to a maximum sharpness by utilizing a maximum ratio of bevel plane etch rate to edge plane etch rate. This maximum ratio maximizes the edge sharpness when a steady state etching geometry has been achieved. In one embodiment, and for a given edge sharpness, blade drag is minimized by selecting the crysta- llographic orientation and etchant such that the etchant chemic- ally polishes the bevels and maintains the planarity of the bevel planes. In order to achieve identical ething of the bevels meeting at the blade edge and thus maintain original blade geometry, the blank can be oriented such that the edge forming planes are crystallographically identical planes. -1-

461725

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