Resorbable metal screw with increased torsional strength for osteopathy

US9962210B2 · kind B2 · utility

Assignee

• BIOTRONIK AG · CH

Inventors

• Ullrich Bayer · Bad Doberan, DE
• Okechukwu Anopuo · Rostock, DE
• Daniel Lootz · Rostock, DE

Key dates

• Filing date: Mar 3, 2016
• Grant date: May 8, 2018
• Expiry date: Dec 8, 2036

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61L2430/02
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

A bone screw formed primarily of a magnesium alloy has a self-tapping thread, and is prestressed with a retained torsional stress oriented oppositely to the direction in which the screw is screwed into bone. The pre-stressing opposes the torsional stresses arising from screwing in the screw, thereby raising the effective strength of the screw and/or allowing for a reduction in its size/mass.