Bone Shaver And Groover

Abstract

A hand-tool for shaving bone or cartilage has a flat shank slightly bent near its end and then reversely curled with a sharp edge at its extremity. In one form of the tool a narrow extension projects from the middle of the sharp edge, the extension having sharp edges on its three sides.

Parent Case Text

This invention is a continuation of my earlier filed application, Ser. No. 660,621, filed Aug. 15, 1967, and now abandoned.

Description

This invention relates to a tool for shaving and/or grooving bone or cartilage, being specially designed for operations on the bony structure of the nose. It may be used anywhere on the skeletal structure of the body for the purpose of collecting fine bone shavings which can be placed in other areas of the skeletal framework, or for producing grooves of various widths and depths in the skeletal framework.

It is an object of the invention to provide a tool such that the thickness of the scrapings can be regulated by the angle at which the tool is held when in use. For this purpose the tool is made with a flat shank which is slightly bent in one direction near its end, serving as a fulcrum of the tool, and then is curled in the opposite direction to terminate in a sharp cutting edge suitably spaced from the adjacent surface of the shank to facilitate scraping thin shavings from a bone.

For a more complete understanding of the invention reference may be had to the following description thereof and to the drawing, of which

FIG. 1 is a perspective view of a tool embodying the invention;

FIG. 2 is a fragmentary side view of the tool in operation;

FIG. 3 is a similar view showing the tool at a different angle to the bony surface;

FIG. 4 is a plan view of a modified form of the tool for use in grooving as well as shaving; and

FIG. 5 is a plan view, on a larger scale, of a portion of the tool shown in FIG. 4.

A bone-shaving tool 10 is shown in FIG. 1, this tool having a handle portion 12 and a flat shank 14. The shank 14 is straight for the most part but near its operating end it bends away from its axis as at 16, the angle of bend being preferably about 20.degree. but may vary from 10.degree. to 60.degree.. A short distance beyond this bend the end portion of the tool is curled sharply in the other direction through an arc of 80.degree. to nearly 180.degree. as at 18, the extremity being bevelled to form a sharp cutting edge 20. The curl 18 crosses the axis of the shank 14 so that the edge 20 is in a position to engage a surface when the tool is held nearly parallel thereto. The thickness of the shavings cut from a bony surface 22 can be regulated to a considerable extent by the angle which the shank makes with such surface when the tool is drawn across it with the bend 16 bearing thereon. As indicated in FIGS. 2 and 3, the greater the angle between the shank 14 and the surface 22, the thicker will ordinarily be the shavings.

In shaving the bony structure of the nose, it is often desirable to cut a central groove. For this purpose the tool may be made with a small extension 24 or 24' projecting beyond the middle of the cutting edge 20' as indicated in FIGS. 4 and 5. This extension may be of any suitable shape, a square shape 24 being illustrated in FIG. 4, a tapered shape 24' being illustrated in FIG. 5, all of the edges of the extension being sharp cutting edges 26. The extension may be of variable length and thickness. It also forms an angle or arc of 80.degree. to 180.degree..

The tools illustrated on the drawing are shown as one-piece tools. If preferred, the end portion of the shank, including the cutting edge or edges, may be made detachable for replacement when desired.

Claims

What is claimed is:

1. A tool for shaving bony structure of the nose, said tool having a flat shank with a bend of a few degrees away from the longitudinal axis of said tool near the working end thereof and a working end extremity curled in the opposite direction across said axis, said bend being a fulcrum of said tool, said working end extremity having at its distal end a sharp cutting edge transversally disposed to said axis.

2. An elongated tool for shaving the bony structure of the nose, said tool having a shank with an end portion extending a few degrees away from the longitudinal axis of said tool near the working end thereof, the extremity of said end portion curled in the opposite direction across said axis, said extremity having at its working end a sharp cutting edge transversally disposed to said axis, said cutting edge being directed back toward said shank.

3. The tool as claimed in claim 2 wherein said tool includes a small extension from the middle of its end edge, the edges of said extention being sharp cutting edges to be used for developing a groove in bone.