Bone anchor assemblies and methods with improved locking

US9918747B2 · kind B2 · utility

Assignee

• DePuy Synthes Products, Inc. · US

Inventors

• Frank Spratt · Bridgewater, US
• Philip A. Cormier · Quincy, US
• Ernest Quintanilha · Norton, US
• Sara Dziedzic · Milton, US
• Nicholas Pavento · Attleboro, US
• Derek Shaw · Raynham, US
• Thibault Chandanson · Yverdon-les-Bains, CH

Key dates

• Filing date: Dec 11, 2015
• Grant date: Mar 20, 2018
• Expiry date: Dec 11, 2035

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61B2090/037
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

Various exemplary methods and devices are provided for fixing bone anchors to bone. In general, the methods and devices can allow for a bone anchor to be fixed to a bone at a desired angle to a receiver member. In an exemplary embodiment, a bone anchor assembly is provided that includes a bone anchor configured to engage bone, a receiver member that polyaxially seats a spherical head of the bone anchor, and a compression member seated within the receiver member, proximally of the head of the bone anchor. The compression member can have a distal end with gripping features thereon configured to create at least one line contact and/or one band contact with the head of the bone anchor, thus providing a firm grip on the head of the bone anchor and reducing a risk of slippage of the bone anchor with respect to the receiver member.