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This is a record of a document published elsewhere, first published by the United States Patent and Trademark Office, as US-5607428-A, on 4 March 1997. OpenTechnical did not first disclose it. The identifier, hashes and timestamps below record what this library served and when, not when the material became public. View the original.

OT-2026-000003265

Orthopedic fixation device having a double-threaded screw

Published
Permanent URL
Classification
Tools & Tooling › Clamping Tools
Original source
US-5607428-A, the United States Patent and Trademark Office, 4 March 1997
Document SHA-256
ddefc4fa72589a9bfbfe88cd0d5e967e322fdd8d73f18b8e792c5b34868389d1

An orthopedic fixation device includes a fixation plate having at least one through hole in which a direction adjusting ring is held securely. The direction adjusting ring is provided with an inner threaded hole engageable with a second threaded portion of a double-threaded bone screw. Located at a lower portion of the double-threaded bone screw is a first threaded portion which is fastened onto a bone or vertebra. Located at the top end of the double-threaded bone screw is a head for urging and spreading a plurality of arresting edges located at the upper side of the direction adjusting ring so as to cause the direction adjusting ring to be retained securely in the round through hole of the fixation plate. The axis of the threaded hole of the direction adjusting ring forms with the axis of an outer ring body of the direction adjusting ring an angle ranging between 3 and 15 degrees.

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Abstract

An orthopedic fixation device includes a fixation plate having at least one through hole in which a direction adjusting ring is held securely. The direction adjusting ring is provided with an inner threaded hole engageable with a second threaded portion of a double-threaded bone screw. Located at a lower portion of the double-threaded bone screw is a first threaded portion which is fastened onto a bone or vertebra. Located at the top end of the double-threaded bone screw is a head for urging and spreading a plurality of arresting edges located at the upper side of the direction adjusting ring so as to cause the direction adjusting ring to be retained securely in the round through hole of the fixation plate. The axis of the threaded hole of the direction adjusting ring forms with the axis of an outer ring body of the direction adjusting ring an angle ranging between 3 and 15 degrees.

1. Drawings

[0001]Sheet 1.

[0002]Sheet 2.

Publication information

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Citation

OpenTechnical Publication OT-2026-000003265, “Orthopedic fixation device having a double-threaded screw,” published September 15, 2026 at 19:58:38 UTC, https://opentechnical.org/p/OT-2026-000003265.

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