US5037423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and instrumentation for the replacement of a knee prosthesis
Assignee: Howmedica Osteonics Corp
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Filing: 1990-05-07
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Granted: 1991-08-06
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Expires: 2010-05-07
Abstract
Abstract A novel method for replacing a previously implanted knee joint prosthesis in a patient is disclosed in which the previously implanted femoral component is replaced with a revision femoral component having thicker distal and posterior bearing portions so as to restore the natural anatomic transverse joint plane and collateral ligamentous balance in extension and flexion of the prosthetic joint. Instrumentation for use in this method includes a novel revision cutting jig which is used in the preparation of the distal end of the femur for the implantation of the revision femoral component.
Inventors
- 👤 Robert V. Kenna
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:28
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/14; A61B17/15; A61B17/154; A61B17/155; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/38
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
194 words
A cutting jig for use in the preparation of the distal end of a femur for the implantation of a femoral prosthesis, said cutting jig comprising a body portion having parallel distal and proximal base faces and anterior and posterior side cutting faces diverging form one another in the proximal direction and forming obtuse angles with said distal base face, means on said proximal base face for temporarily securing the jig to the distal end of said femur, means within said body portion for the connection thereto to one end of a rod adapted to be positioned within the intramedullary canal of the femur, said means allowing medial-lateral adjustment of the position of said rod within the cutting jig body, means for the releasable attachment of a handle to said body portion, means for the releasable attachment of a pin holder alignment guide to said body portion, and a tongue extending from said anterior side cutting face, with the section of said tongue furthest from said anterior side cutting face extending in the proximal direction to the free end of the tongue and being substantially perpendicular to the plane of said proximal base face.
Claim 2
Dependent Claim
194 words
A cutting jig for use in the preparation of the distal end of a femur for the implantation of a femoral prosthesis, said cutting jig comprising a body portion having parallel distal and proximal base faces and anterior and posterior side cutting faces diverging form one another in the proximal direction and forming obtuse angles with said distal base face, means on said proximal base face for temporarily securing the jig to the distal end of said femur, means within said body portion for the connection thereto to one end of a rod adapted to be positioned within the intramedullary canal of the femur, said means allowing medial-lateral adjustment of the position of said rod within the cutting jig body, means for the releasable attachment of a handle to said body portion, means for the releasable attachment of a pin holder alignment guide to said body portion, and a tongue extending from said anterior side cutting face, with the section of said tongue furthest from said anterior side cutting face extending in the proximal direction to the free end of the tongue and being substantially perpendicular to the plane of said proximal base face.
Claim 3
Dependent Claim
81 words
In combination: a cutting jig of claim 1; a pin holder alignment guide releasably attached to the body portion of said cutting jig; and a cylindrical rod adapted to be positioned within the intramedullary canal of said femur and securely attached to the body portion of said cutting jig as a result of the cooperation of means at the distal end of said cylindrical rod, said pin holder alignment guide and said connection means within the body of said cutting jig.
Claim 4
Dependent Claim
27 words
A combination of claim 2 wherein said cylindrical rod is angled laterally at an angle of about 8° from a direction perpendicular to said proximal base face.
Claim 5
Dependent Claim
46 words
A cutting jig as set forth in claim 1 wherein said means within said body portion for connection of said rod thereto comprises an open keyway slot in said proximal base face for sliding engagement with a corresponding key at said one end of said rod.
Claim 6
Dependent Claim
33 words
A cutting jig as set forth in claim 4 wherein said keyway slot on said proximal base face includes means for preventing said rod from disengaging from said body in the proximal-distal direction.
Claim 7
Dependent Claim
27 words
A cutting jig as set forth in claim 4 further including means for limiting sliding movement of said rod within said keyway slot in the medial-lateral direction.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-08-05 | 1995-02-04 | 1995-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-05 | 1999-02-04 | 1999-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-05 | 2003-02-04 | 2003-08-06 | $7700.00 | Window Closed / Lapsed |