Multi-threaded cannulated bone anchors

US9155580B2 · kind B2 · utility

Assignee

• Medos International Sarl · CH

Inventors

• Philip A. Cormier · Quincy, US
• Frank Spratt · Bridgewater, US
• Richard W. Fournier · New Bedford, US
• Sara Root · Stoughton, US
• Thibault Chandanson · Yverdon-les-Bains, CH

Key dates

• Filing date: Aug 22, 2012
• Grant date: Oct 13, 2015
• Expiry date: Aug 22, 2032

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61B17/864
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

A cannulated bone anchor assembly includes a bone anchor, a receiver member for receiving a spinal fixation element to be coupled to the bone anchor, and a closure mechanism to fix the spinal fixation element with respect to the receiver member. The bone anchor includes a distal shaft having a first threaded section distal to a proximal head, a second threaded section distal to and adjacent the first threaded section, and a third threaded section distal to and adjacent the second threaded section. The first threaded section having a constant major and minor diameter. The second threaded section having a tapering major and minor diameter. The third threaded section having a tapering major diameter and a constant minor diameter.