Constrained knee prosthesis

US9579209B2 · kind B2 · utility

Assignee

• SMITH & NEPHEW, INC. · US

Inventors

• Brian W. McKinnon · Bartlett, US
• Nathaniel Milton Lenz · Germantown, US
• Scott Kennedy Laster · Memphis, US
• Michael D. Ries · Chico, US
• Steven B. Haas · New York, US

Key dates

• Filing date: Jul 11, 2014
• Grant date: Feb 28, 2017
• Expiry date: Jul 11, 2034

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61F2/4684
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

A tibial insert includes a base and a post extending from the base along a longitudinal axis. The post has a medial surface, a lateral surface, and a height along the longitudinal axis. The medial surface has a medial section, and the lateral surface has a lateral section oriented substantially parallel to the medial section. The medial section and the lateral section each have a width in a substantially anterior-posterior direction that is sufficient to enable varus/valgus constraint over a flexion/extension range from extension to about 90 to 120 degrees of flexion when the tibial insert is mated with a femoral component.