Machining assembly and methods for preparing the medullary cavity of a femur in hip arthroplasty

US5810830A · kind A · utility

Assignee

• Howmedica Inc. · DE

Inventors

• Philip C. Noble · Houston, US
• Michael Hammer · Pine Brook, US
• Richard G. Eckrote · Lincoln Park, US
• Michael J. Schulzki · Rancho Santa Fe, US
• Stuart L. Axelson, Jr. · Rahway, US

Key dates

• Filing date: Nov 13, 1996
• Grant date: Sep 22, 1998
• Expiry date: Nov 13, 2016

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61B17/1668
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

A machining assembly, including a of the disclosure novel broach design, are disclosed for preparing a femoral medullary cavity for receipt of a femoral prosthetic stem, wherein the configuration of the implantation site allows for the neutral alignment of the prothesis within the medullary cavity for improved rigid fixation of the prosthetic stem therein. Aspects of the inventive machining assembly include a novel broach comprising a proximal lateral recess that allows for initial avoidance of the greater trochanter during implantation, thereby resulting in the preparation of a neutrally aligned cavity with respect to the broach. The machining assembly also includes a guide and a second cutting instrument for removing the bone of the greater trochanter once neutral alignment between the medullary cavity and broach are achieved for the subsequent implantation of a neutrally aligned femoral prosthesis.