OPENTECHNICAL PUBLICATION
OT-2026-000003235

Screw made of biodegradable material for bone surgery purposes, and screwdriver suitable therefor

Published: 2026-09-15T19:53:59.347597Z
Permanent URL: https://opentechnical.org/p/OT-2026-000003235
Categories: Tools & Tooling > Fastening Tools

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ABSTRACT

In a screw made of biodegradable material for bone surgery purposes, the outer
surface of the screw body is provided with a coaxial external thread. A
coaxial channel of sawtoothed star-shaped transverse cross-sectional profile
is provided in the screw body, which channel is open at the proximal end in
order to receive the complementarily shaped shaft of a screwdriver, and
extends into the area of the distal end. The channel wall is radially
symmetrical about the longitudinal axis in regular rotary steps and defines an
axial channel area and a plurality of lobe areas arranged uniformly around the
channel area. In each lobe area the channel wall has a pair of flanks which
extend into the vicinity of an end of the lobe area remote from the channel
area. In a cross-section of the screw body, each lobe area is formed
asymmetrical in respect of a diametrical plane. A section of the contour line
which corresponds to the leading flank is shorter than a section of the
contour line which corresponds to the trailing flank. The leading flank may
have a form which leads to an increasing extent as the radial distance
increases in the direction of screwing-in. At the end of the lobe area the
flanks can run together to form an edge and define 3 to 8, preferably 6,
sickle-shaped teeth which are salient with respect to the direction of
rotation.

1. Drawings

[0001] Sheet 1.

[0002] Sheet 2.

[0003] Sheet 3.

[0004] Sheet 4.

[0005] Sheet 5.

[0006] Sheet 6.

[0007] Sheet 7.

[0008] Sheet 8.

[0009] Sheet 9.

[0010] Sheet 10.

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OpenTechnical publication OT-2026-000003235
Published 2026-09-15T19:53:59.347597Z
https://opentechnical.org/p/OT-2026-000003235