Patent EP0502738A1 successfully refreshed from Google Patents.
EP0502738A1
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EP
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Modular guide for shaping of femur
Assignee: Wright Medical Technology Inc
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Filing: 1992-03-05
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Granted: —
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Expires: 2012-03-05
Abstract
Abstract Modular surgical instrumentation and a method of using same is provided, according to the invention. The instrumentation comprises a first bracket (10) defining a generally U-shaped structure having an internal surface adapted to be seated on the distal aspect of a resected femur (11) bone and an elongated central opening (23) appointed to expose a selected area of the resected femur, including a curved track (20,21) for guiding a first shaping tool (30) along a predetermined path for controlled shaping of a curved patellar groove in a portion of the selected ares exposed through the opening. A second bracket (300) defines a linear slotted bore (302) extending generally parallel to the long axis of the femur for guiding a second shaping tool (304) to form a relatively deep recess accommodating an intercondylar stabilizing housing of a knee implant. The second bracket has an internal surface defining a shape adapted for releasable engagement with the curved track, including mechanism for accurately aligning the slotted bore relative to the opening while forming the recess.
Inventors
- 👤 Bradley James Coates
- 👤 Joseph Michael Ferrante
- 👤 Leo Allen Whiteside
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 21:36
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/16; A61B17/1662; A61B17/1675; A61B17/14; A61B17/142; A61B17/144; A61B17/1659; A61B17/17; A61B17/1739; A61B17/1764; A61B2017/1602
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
162 words
Surgical instrumentation comprising, in combination: (a) a first bracket defining a generally U-shaped structure having an internal surface adapted to be seated on the distal aspect of a resected femur bone and an elongated central opening appointed to expose a selected area of the resected femur, including a curved track for guiding a first shaping tool along a predetermined path for controlled shaping of a curved patellar groove in a portion of the selected area exposed through the opening; (b) a second bracket including a base presenting a distally-facing surface and means for supporting the base in releasable engagement with the track, including a bore extending through the base in a direction generally parallel to the long axis of the femur to guide a second shaping tool in forming a relatively deep recess in the femur for accommodating an intercondylar stabilizing housing of a knee implant; and (c) means for accurately aligning the bore relative to the opening while forming the recess.
Claim 2
Dependent Claim
26 words
The instrumentation of claim 1 wherein the bore further comprises a cylindrical aperture having a pair of tangentially-formed slots extending along the length of the aperture.
Claim 3
Dependent Claim
15 words
The instrumentation of claim 2 wherein the first shaping tool further comprises an end mill.
Claim 4
Dependent Claim
32 words
The instrumentation of claim 3 wherein the bore has a stop and the end mill has a shoulder which bottoms-out in the stop, controlling the depth of the recess being thereby formed.
Claim 5
Dependent Claim
41 words
The instrumentation of claim 3 wherein the second shaping tool further comprises a punch having a generally U-shaped cross-section which corresponds to that of the slotted bore and is received therein to cut away the remaining bone for the housing recess.
Claim 6
Dependent Claim
27 words
The instrumentation of claim 5 wherein the punch further comprises a sharpened U-shaped edge which bottoms-out a common proximal distance into the femur with the end mill.
Claim 7
Dependent Claim
63 words
The instrumentation of claim 1 wherein the track further comprises a pair of ledges extending along the edges of the elongated opening of the first bracket, the support means including a pair of legs extending from the base of the second bracket on opposed sides of the opening and terminating in a pair of feet having contoured proximal surfaces which engage the ledges.
Claim 8
Dependent Claim
39 words
The instrumentation of claim 1 wherein the alignment means further comprises a pair of attachment pegs extending distally from the first bracket and engaging a cooperating slot formed in the second bracket which is oriented in a lateral-medial direction.
Claim 9
Dependent Claim
124 words
A method of implanting a condylar prosthesis of the type having an intercondylar stabilizing housing, the method comprising the steps of: (a) providing the instrumentation of claim 1, seating the first bracket thereof on the distal aspect of a resected femur and moving the first shaping tool along the curved track to form a patellar groove in a selected ,area thereof; (b) withdrawing the first shaping tool, leaving the first bracket seated on the femur; (c) seating the second bracket securely on the curved track so that the bore of the second bracket is accurately aligned with the opening of the first bracket; and (d) moving a second shaping tool through the bore to form a recess accommodating the intercondylar-stabilizing housing of the implant.
Claim 10
Dependent Claim
82 words
The method of claim 9 further comprising the steps of: providing an end mill as the first shaping tool and moving the end mill through the bore to form a hole in the femur; providing a pair of tangential slots in the bore which extending the length thereof; providing a punch with a generally U-shaped cross-section and moving the punch through the slotted bore to contact the bottom of the hole and form the recess to accommodate the housing of the implant.
References Cited (Backward Citations)
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