US 8,075,566 B2Granted

Navigated lateral/medial femoral resection guide

AssigneeHowmedica Osteonics Corp.

InventorsAlex F. Canonaco, Michael J. Cusick, Sandeep K. Chauhan

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Abstract

A multi-piece knee resection instrument for use in forming an anterior cut, an anterior chamfer cut, a posterior cut and a posterior chamfer cut on a distal femur which has already had a distal surface thereof resected which cuts are for the mounting of a prosthetic implant, has a first resection guide for attachment to the medial or lateral side of the distal femur. The first resection guide has a first surface facing generally anteriorly when mounted and a second surface extending distally from the first surface and angled thereto and a third surface extending generally parallel to the resected distal surface of the femur. A second resection guide is mounted on the first and second surfaces of the first resection guide for performing the anterior and anterior chamfer cuts. A third resection guide is mounted on the third surface of the first resection guide and extends in a medial-lateral direction therefrom across at least part of the resected distal femoral surface.

Claims14

Dependent claims

A multi-piece knee resection instrument for resecting the distal femur comprising:

a first resection guide block for attachment to the medial or lateral side of the distal femur having a first planar surface lying in a first plane facing generally anteriorly and a second planar surface extending distally from said first planar surface along a second plane at an obtuse angle to the first plan, said first and second planar surfaces each having a coupling element thereon and a planar third surface extending from the second planar surface at an obtuse angle to the second surface, and extending in a third plane generally perpendicular to the first plane and generally parallel to a resected distal planar surface of the femur;
a first resection guide having a coupling element for releasably mounting the first resection guide to both of the coupling elements on said first and second surfaces of said first resection guide block, said first resection guide having a cutting tool engaging surface thereon for directing a cutting tool in a direction generally parallel to the first and second planes;
and
a second resection guide releasably mounted on the planar third surface of said first resection guide block and extending along a medial-lateral plane across at least part of the distal planar surface of the femur, said second resection guide having two non-parallel cutting tool engaging planar surfaces thereon extending transverse to the third plane and extending through the distal planar surface of the femur with one of the two non-parallel cutting tool engaging planar surfaces extending along a plane at an obtuse angle to the third plane.

1 more element

A kit of instruments for performing an anterior bone cut, an anterior chamfer cut, a posterior cut and a posterior chamfer cut on the distal femur comprising:

at least one resection block having a first portion for mounting on the medial or lateral side of the distal femur said block having a first planar surface thereon lying in a generally anteriorly facing first plane with a coupling element and a second planar surface extending along a second plane at an obtuse angle to the first plane, the second surface having a coupling element thereon, the resection block having a medial-laterally extending second portion for mounting on a third planar surface on said first portion, the second resection block portion having a surface extending along a third plane generally perpendicular to the first plane and at an obtuse angle to the second plane, the second resection block portion planar surface extending along the third plane adjacent a resected surface on a distal femur;
at least one cutting guide having a cutting tool engaging guide surface for guiding a cutting tool in a medial-lateral direction having a coupling element releasably mounted on the coupling element on said first or second surfaces of said resection block first portion, when mounted on the first and second surfaces the at least one cutting guide is capable of directing saw blade along the first and second planes forming the anterior and anterior chamfer cuts;
at least one modular optical tracker for use with a computer-aided navigation system for mounting on said resection block;
and
at least one anterior referencing arm having a coupling element thereon for contacting the anterior femur surface and capable of being releasably mounted on said resection block first surface coupling element.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/581,542Filed 16 Oct 2006 · continuation
Priority: 19 May 2004
Published: US 2007/0055270 A18 Mar 2007
Granted: 13 Dec 2011
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

A61B 17/155
For preparing bone for knee prosthesis: cutting femur
A61B 34/20
Computer-aided surgery; Manipulators or robots specially adapted for use in surgery: surgical navigation systems; Devices for tracking or guiding…
A61B 2034/2055
Tracking techniques: optical tracking systems
A61B 2090/3945
Visible markers: active visible markers, e.g. light emitting diodes

Family

Application10/849,625Parent of this continuation · filed 19 May 2004
US 2007/0055270 A1Pre-grant publication · published 8 Mar 2007
US 7,182,767 B2Parent of this continuation
US 2005/0261697 A1Published application
US 8,075,566 B2This patent

From the US filing history. Foreign family members aren’t listed.