Femoral milling instrumentation for use in total knee arthroplasty with optional cutting guide attachment
First Claim
1. An instrumentation set for shaping bone to accommodate a prosthetic implant, said instrumentation set including;
- a first alignment means configured for connection to an exposed end of a bone to be milled for establishing a reference plane substantially perpendicular to a mechanical axis of the bone,a second alignment means removably carried by said first alignment means for establishing amount of bone to be removed during milling,base means removably carried by said second alignment means by a locking mechanism and configured for temporary fixation to the exposed end of the bone, said base means establishing a reference point relative to the bone to be milled,a milling guide for connection to the base means adjacent the exposed end of the bone, said milling guide including a plurality of walls, each wall defining a slot for accommodating a milling device, each wall of said milling guide defining a distinct reference plane adjacent said exposed end of the bone, the milling guide configured to guide a milling device along each slot for shaping the bone.
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Accused Products
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.
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Citations
15 Claims
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1. An instrumentation set for shaping bone to accommodate a prosthetic implant, said instrumentation set including;
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a first alignment means configured for connection to an exposed end of a bone to be milled for establishing a reference plane substantially perpendicular to a mechanical axis of the bone, a second alignment means removably carried by said first alignment means for establishing amount of bone to be removed during milling, base means removably carried by said second alignment means by a locking mechanism and configured for temporary fixation to the exposed end of the bone, said base means establishing a reference point relative to the bone to be milled, a milling guide for connection to the base means adjacent the exposed end of the bone, said milling guide including a plurality of walls, each wall defining a slot for accommodating a milling device, each wall of said milling guide defining a distinct reference plane adjacent said exposed end of the bone, the milling guide configured to guide a milling device along each slot for shaping the bone. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An instrumentation set for shaping bone to accommodate a prosthetic implant, said instrumentation set including:
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a first alignment means configured for connection to an exposed end of a bone to be milled for establishing a reference plane substantially perpendicular to a mechanical axis of the bone, a second alignment means removably carried by said first alignment means for establishing amount of bone to be removed during milling, base means removably carried by said second alignment means by a locking mechanism and configured for temporary fixation to the exposed end of the bone, said base means establishing a reference point relative to the bone to be milled, a milling guide for connection to the base means adjacent the exposed end of the bone, said milling guide including a plurality of walls, each wall defining a slot for accommodating a milling device, each wall of said milling guide defining a distinct reference plane adjacent said exposed end of the bone, the milling guide configured to guide a milling device along each slot for shaping the bone, wherein said base means includes a plurality of openings for accommodating fastening devices to secure the base means to the bone, said base means includes at least two bodies connectable on opposite medial and lateral sides of the bone, at least one of the two bodies including a said locking mechanism engagable with the second alignment means and the milling guide for temporarily clamping the alignment means and milling guide to the body.
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Specification