Surgery – Instruments – Orthopedic instrumentation
Patent
1995-03-02
1997-09-09
Tucker, Guy V.
Surgery
Instruments
Orthopedic instrumentation
606 79, 606 89, 606 87, 623 22, A61B 1756
Patent
active
056650906
DESCRIPTION:
BRIEF SUMMARY
This application is filed under 35 U.S.C. 371 based on PCT/US 92/07677 which was filed on Sep. 9, 1992.
BACKGROUND AND SUMMARY OF THE INVENTION
The present invention relates to the bone cutting apparatus and method. More particularly, the present invention relates to an apparatus and method for forming a preliminary cut in a proximal end of a bone to guide insertion and establish the position of a prosthetic implant within the bone.
It is known to install prosthetic implants into a resected end of the bone to replace the humeral head in a total shoulder arthroplasty. The humeral implant typically includes a body portion which is inserted into the resected proximal end of the humerus. A stem is coupled to the body portion. The stem passes into the intramedullary canal of the humerus. The body portion of the humeral component typically includes a plurality of fins designed to anchor the body portion of the implant within the bone and to provide rotational stability of the implant.
It is also known to provide a series of broaches having an increasing size to cut the bone from the proximal end of the humerus to permit installation of the implant. Typically, the broaches are inserted into the resected end of the humerus and removed to remove bone. The largest broach is typically sized to be slightly smaller than the implant so that the implant can be press-fit into the canal in the bone formed by the largest broach. The broaches typically include fins corresponding to the fins on the implant.
It is also known to provide a box osteotome which cuts a rectangularly shaped section from a resected bone prior to insertion of a broach. The box osteotome does not attempt to mimic the shape of the implant.
One object of the present invention is to provide a cutting apparatus having substantially the same cross sectional size and shape as the broach and implant to cut a pattern in a proximal end of a bone for guiding insertion of the broach and implant into the bone.
Another object of the present invention is to provide a modular cutting apparatus capable of preparing the proximal end of the bone for receiving a prosthetic implant which has mismatched sizes of a body portion and to a stem.
Another object of the present invention is to provide cutting apparatus which establishes the size of the implant and controls the version of the implant.
According to one aspect of the present invention, an apparatus is provided for preparing a bone for receiving a prosthetic implant which has a body portion and a stem portion. The body portion of the implant includes a plurality of fins arranged in a predetermined pattern on the body portion. The apparatus comprises a cutter including means for cutting fin tracks in the bone to guide the plurality of fins on the implant as the implant is installed into the bone. The apparatus also includes a rod coupled to the cutter for locating the cutter relative to an intramedullary canal of the bone, and means coupled to the cutter for driving the cutter and rod into the bone.
In the illustrated embodiment, the means for cutting fin tracks in the bone includes a plurality of fins formed on the cutter and arranged in the same pattern as the plurality of fins on the body portion of the implant. The fins on the cutter cut the bone in a predetermined pattern to guide installation of the implant.
According to another aspect of the invention, an apparatus is provided for preparing a bone for receiving a prosthetic implant which includes a body portion having a predetermined size and a stem portion coupled to the body portion. The stem portion of the implant has a selected one of at least two different stem sizes. The apparatus includes a cutter for cutting the bone to prepare the bone for receiving the body portion of the implant, and at least two rods having different sizes corresponding to the at least two different stem sizes. The apparatus also includes means for coupling a selected rod having a size corresponding to the selected size of the stem to the cutter. The rod is removable from the cut
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Ondrla Jeffrey M.
Rockwood Charles A.
Serbousek Jon C.
Susaraba David A.
DuPuy Inc.
Tucker Guy V.
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