Femoral milling instrumentation for use in total knee arthroplasty with optional cutting guide attachment

• US 5,769,855 A
• Filed: 03/31/1997
• Issued: 06/23/1998
• Est. Priority Date: 07/06/1993
• Status: Expired due to Term

• Current Assignee: Zimmer Technology Incorporated (Zimmer Biomet Holdings, Inc.)
• Original Assignee: Zimmer Incorporated (Zimmer Biomet Holdings, Inc.)
• Inventors: Bertin, Kim C., Stalcup, Gregory C., Bays, Rodney, Burke, Dennis W.
• Primary Examiner(s): Tucker, Guy V.
• Application Number:
  US08/829,626
• Time in Patent Office: 449 Days
• Field of Search: 606/88, 606/87, 606/86, 606/89, 606/96, 606/79, 606/80, 606/82
• US Class Current: 606/88
• CPC Class Codes: A61B 17/154 for preparing bone for knee prosthesis
• CPC Class Codes: A61B 17/155 Cutting femur
• CPC Class Codes: A61B 17/1675 for the knee
• CPC Class Codes: A61B 17/17 Guides or aligning means for drills , mills, pins or wires
• CPC Class Codes: A61B 17/1764 for the knee
• CPC Class Codes: A61B 2017/1602 Mills

Abstract

The milling instrumentation of this invention provides a milling guide connected to the femur for accommodating a milling device. The milling instrumentation includes an alignment guide which is used by the surgeon to set a femoral bracket or base on the medial and lateral sides of the exposed femur adjacent its distal end. Once the brackets are set, the alignment guide is removed and a milling guide is connected to the bases. The milling guide establishes a series of reference planes each including a slot. A powered milling device having a burr connected thereto is guided by the slots along the reference planes to accurately mill away a portion of the bone. The milling device includes a bobbin-shaped tip which positively engages the slots to ensure that the milling device is held substantially perpendicular to the reference planes of the milling guide. If necessary, other instrumentation may be connected to the femoral bases which would form a common connection point for the additional instruments thereby ensuring alignment between the various instruments. Optionally, a one piece cutting guide may be connected to the bases to allow resection of the bone by a standard oscillating saw blade. The cutting guide includes a plurality of slots such that all the cuts required for the femur can be made with one cutting guide without reorienting the guide.

Claims

1. A pair of bases for connection to an exposed end of a bone adjacent a surface to be machined, said bases each including a means for the connection of orthopaedic instruments, said bases further including locator means for aligning said instruments with said bases and relative to the bone surface to be machined, each of said bases includes at least two openings for accommodating fastening devices, said openings of each of said bases being formed at a converging angle relative to one another, said bases being configured to be positioned with one of said bases on a medial side of said bone and with one of said bases on a lateral side of said bone, said bases being spaced relative to one another, said bases being configured to be positioned adjacent to the medial and lateral side of the surface to be machined.

2. The base of claim 1 wherein said bases includes a locking means engagable with said orthopaedic instruments for locking the instruments to the base.

3. The bases of claim 1 wherein each base includes a pair of substantially flat adjacent surfaces which lie in nonparallel plains, said connecting means being positioned between the substantially flat surfaces.

4. A pair of bases for connection to an exposed end of a bone adjacent a surface to be machined, said bases each including a means for the connection of orthopaedic instruments, said bases further including locator means for aligning said instruments with said bases and relative to the bone surface to be machined, each of said bases includes at least two openings for accommodating fastening devices, said bases being configured to be positioned with one of said bases on a medial side of said bone and with one of said bases on a lateral side of said bone, said bases being spaced relative to one another, said bases being configured to be positioned adjacent to the medial and lateral side of the surface to be machined.