Orthodontic expansion screw

US4347054A · kind A · utility

Assignee

• DENTAURUM J.P. WINKELSTROETER KG · DE

Inventors

• Hans-Joachim Kraus · Waldbronn, DE
• Berthold Walter · Oberasbach, DE

Key dates

• Filing date: Mar 20, 1978
• Grant date: Aug 31, 1982
• Expiry date: Mar 20, 1998

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61C7/10
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

An orthodontic expansion screw is provided having two screw bodies which are displaceable relative to each other by a screw spindle. A guide pin disposed parallel to the spindle is attached to an attachment section of one of the screw bodies and engages a guide bore of the second screw. The screw spindle has threaded sections of counter-rotating threads which engage threaded bores in the screw bodies; such opposed sections extend from an actuating section to which attached. The second screw body has a guide portion which extends from the second screw body portion. The first screw body has a threaded body portion extending from the attachment section whereby maximum separation of the screw bodies is permitted by virtue of the extended threaded bore.