Bone anchor assemblies and methods with improved locking

US11311318B2 · 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: Jun 25, 2019
• Grant date: Apr 26, 2022
• Expiry date: May 12, 2040

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 seats a spherical head of the bone anchor and a spinal fixation element, a compression member seated within the receiver member, proximally of the head of the bone anchor, and a closure mechanism seated within the receiver member, proximally of the compression member. One or more of the receiver member, the compression member, and the closure mechanism can have gripping features thereon configured to secure the bone anchor and/or the spinal fixation element within the receiver member, thereby reducing a risk of slippage of the bone anchor and/or the spinal fixation element with respect to the receiver member.