US5879393A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trial femoral prosthesis for use in knee joint replacement surgery
Assignee: Smith and Nephew Inc
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Filing: 1997-05-21
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Granted: 1999-03-09
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Expires: 2017-05-21
Abstract
Abstract A posterior stabilized femoral trial apparatus for preparing a patient's femur to receive a posterior stabilized femoral prosthesis includes a trial body with proximal and distal portions, the distal portion having an articulating surface for articulating with a patient's tibial component. A module fits the trial body at the proximal surface, the module being selected from a kit or group of modules of differing sizes and shapes. The module includes a rasping surface that extends longitudinally. The trial body includes cutting surfaces at the posterior condyles. The module is removably attachable to the trial body at the proximal surface. During use, the apparatus of the present invention enables the surgeon to resect the patient's femur in a revision surgical case using the trial itself and more particularly the rasping surface and cutting surface thereon.
Inventors
- 👤 Leo A. Whiteside
- 👤 Jason D. Blain
- 👤 Thomas A. Carls
- 👤 Chris E. Johnson
- 👤 Anthony J. Melkent
- 👤 Paul Wheeler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:34
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/46; A61F2/4684; A61B; A61B17/00; A61B17/14; A61B17/15; A61B17/154; A61B17/155; A61B17/16; A61B17/1604; A61B17/1659; A61F2/38; A61F2/3859; A61F2002/30001; A61F2002/30316; A61F2002/30535; A61F2002/30604; A61F2002/30616; A61F2/30721; A61F2/30734; A61F2002/30736; A61F2/30767; A61F2/30771; A61F2002/30878; A61F2250/00; A61F2250/0058; A61F2250/006; A61F2250/0064
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
121 words
A posterior stabilized femoral trial apparatus for preparing a patient's femur to receive a posterior stabilized femoral prosthesis, comprising: a) a trial body that includes medial and lateral portions and proximal and distal portions, the distal portion having an articulating surface for articulating with a patient's tibial component; b) the articulating surface including anterior, distal and posterior condylar portions; c) the proximal surface including a plurality of flat intersecting surfaces; d) a module that fits the trial body at the proximal surface, the module including a rasping surface that extends longitudinally along a proximal to distal plane that is generally parallel to an anterior to posterior plane; e) the module being removably attachable to the trial body at the proximal surface.
Claim 2
Dependent Claim
121 words
A posterior stabilized femoral trial apparatus for preparing a patient's femur to receive a posterior stabilized femoral prosthesis, comprising: a) a trial body that includes medial and lateral portions and proximal and distal portions, the distal portion having an articulating surface for articulating with a patient's tibial component; b) the articulating surface including anterior, distal and posterior condylar portions; c) the proximal surface including a plurality of flat intersecting surfaces; d) a module that fits the trial body at the proximal surface, the module including a rasping surface that extends longitudinally along a proximal to distal plane that is generally parallel to an anterior to posterior plane; e) the module being removably attachable to the trial body at the proximal surface.
Claim 3
Dependent Claim
16 words
The posterior stabilized femoral trial apparatus of claim 1 wherein the module has sharp edges proximally.
Claim 4
Dependent Claim
34 words
The posterior stabilized femoral trial apparatus of claim 1 wherein the module includes spaced portions that extend laterally to both medial and lateral sides of the trial body along a medial to lateral line.
Claim 5
Dependent Claim
21 words
The posterior stabilized femoral trial apparatus of claim 1 further comprising a slot on the distal surface that receives the module.
Claim 6
Dependent Claim
21 words
The posterior stabilized femoral trial apparatus of claim 1 further comprising cutting surfaces on the trial body at the condylar surfaces.
Claim 7
Dependent Claim
28 words
The posterior stabilized femoral trial apparatus of claim 1 further comprising a plurality of cutting guide slots extending from the proximal to the distal surface of the body.
Claim 8
Dependent Claim
36 words
The posterior stabilized femoral trial apparatus of claim 1 further comprising an opening in the trial body in between the condylar portions that extends anteriorly a partial distance toward the anterior portion of the trial body.
Claim 9
Dependent Claim
50 words
The posterior stabilized femoral trial apparatus of claim 1 further comprising an opening in the trial body in between the condylar portions that extends anteriorly a partial distance toward the anterior portion of the trial body and a transverse bar that spans between the condylar portions posteriorly of the opening.
Claim 10
Dependent Claim
26 words
The posterior stabilized femoral trial apparatus of claim 1 further comprising fasteners that enable the module to be attached to and removed from the trial body.
Claim 11
Dependent Claim
35 words
The posterior stabilized femoral trial apparatus of claim 1 wherein the module includes a flanged portion that engages the body and a projecting portion that extends away from the flanged portion along a proximal--distal line.
Claim 12
Dependent Claim
46 words
The posterior stabilized femoral trial apparatus of claim 10 wherein the module includes a flanged portion that engages the body and a projecting portion that extends away from the flanged portion along a proximal--distal line and the projecting portion includes a plurality of flat wall portions.
Claim 13
Dependent Claim
17 words
The posterior stabilized femoral trial apparatus of claim 10 wherein the wall portions carry the rasping surface.
Claim 14
Dependent Claim
22 words
The posterior stabilized femoral trial apparatus of claim 10 wherein the wall portions include a wall portion that carries the rasping surface.
Claim 15
Dependent Claim
17 words
The posterior stabilized femoral trial apparatus of claim 10 wherein the module has a stem portion thereon.
Claim 16
Dependent Claim
40 words
The posterior stabilized femoral trial apparatus of claim 14 wherein the flanged portion defines a plane and the module has a stem portion that forms an angle of less than 90 degrees (90°) with the plane of the flanged portion.
Claim 17
Dependent Claim
21 words
The posterior stabilized femoral trial apparatus of claim 13 wherein the rasping surface is on the lateral side of the module.
Claim 18
Dependent Claim
172 words
A posterior stabilized femoral trial apparatus for preparing a patient's femur to receive a posterior stabilized femoral prosthesis, comprising: a) a trial body that includes proximal and distal portions, the distal portion having a "J" shaped curved articulating surface for articulating with a patient's tibial component; b) the articulating surface including an anterior surface, a distal surface, and a posterior condylar surface; c) the proximal surface including at least one flat surface; d) a module that removably fits the trial body at the flat surface, the module including a plurality of wall portions extending away from the flat surface, one of the wall portions having a rasping surface thereon; e) a stem on the module for fitting a patient's femoral intramedullary canal; f) slots through the trial body having cutting guide surfaces for guiding a surgeons cutting blade for shaping the patient's femur; g) the posterior condylar surface having cutting surface for cutting the patient's femur at the condylar portions of the femur; and h) the module having proximal sharp cutting edges.
Claim 19
Dependent Claim
172 words
A posterior stabilized femoral trial apparatus for preparing a patient's femur to receive a posterior stabilized femoral prosthesis, comprising: a) a trial body that includes proximal and distal portions, the distal portion having a "J" shaped curved articulating surface for articulating with a patient's tibial component; b) the articulating surface including an anterior surface, a distal surface, and a posterior condylar surface; c) the proximal surface including at least one flat surface; d) a module that removably fits the trial body at the flat surface, the module including a plurality of wall portions extending away from the flat surface, one of the wall portions having a rasping surface thereon; e) a stem on the module for fitting a patient's femoral intramedullary canal; f) slots through the trial body having cutting guide surfaces for guiding a surgeons cutting blade for shaping the patient's femur; g) the posterior condylar surface having cutting surface for cutting the patient's femur at the condylar portions of the femur; and h) the module having proximal sharp cutting edges.
Claim 20
Dependent Claim
28 words
The posterior stabilized femoral trial apparatus of claim 17 further comprising a stem extension and wherein the stem extension are connectable at respective sockets and to projecting portions.
Claim 21
Dependent Claim
33 words
The posterior stabilized femoral trial apparatus of claim 17 wherein the module comprises a base having medial and lateral flanged portions for engaging the respective medial and lateral sides of the trial body.
Claim 22
Dependent Claim
74 words
The posterior stabilized femoral trial apparatus of claim 17 wherein the module comprises: a base having medial and lateral flanged portions; a plurality of walls extending from the base; a stem member mounted on the walls generally opposite the base; one of the walls having said rasping surface thereon; the walls carrying a plurality of sharp cutting edges; and the rasping surface extending from the base to a position next to the stem member.
Claim 23
Dependent Claim
25 words
The posterior stabilized femoral trial apparatus of claim 20 further comprising a slot on the trial body that receives the base portion of the module.
Claim 24
Dependent Claim
29 words
The posterior stabilized femoral trial apparatus of claim 20 further comprising a plurality of cutting guide slots extending from the proximal to the distal surface of the trial body.
Claim 25
Dependent Claim
47 words
The posterior stabilized femoral trial apparatus of claim 20 further comprising an opening in the trial body in between the condylar portions that extends anteriorly a partial distance toward the anterior portion of the trial body, and wherein the walls of the module generally surround the opening.
Claim 26
Dependent Claim
32 words
The posterior stabilized femoral trial apparatus of claim 20 wherein the flanged portions have openings therethrough and further comprising connectors for affixing the flanges portions to the trial body at the openings.
Claim 27
Dependent Claim
21 words
The posterior stabilized femoral trial apparatus of claim 20 wherein the module has an open center portion surrounded by the walls.
Claim 28
Dependent Claim
149 words
A femoral trial apparatus for preparing a patient's femur to receive a femoral prosthesis, comprising: a) a trial body that includes proximal and distal portions, the distal portion having a curved articulating surface for articulating with a patient's tibial component; b) the articulating surface including an anterior surface, a distal surface and a posterior condylar surface; c) a kit that includes a plurality of modules that each fit the trial body at the proximal surface, each module including a base portion that fits the proximal surface and a walled portion projecting from the base portion; d) each module being removably attachable to the trial body at the proximal surface; e) the posterior condylar surface having a cutting edge portion that can cut the patient's femur at the femoral condyles during surgical placement of the trial body on the patient's femur; and f) each module having sharp proximal cutting edges.
Claim 29
Dependent Claim
149 words
A femoral trial apparatus for preparing a patient's femur to receive a femoral prosthesis, comprising: a) a trial body that includes proximal and distal portions, the distal portion having a curved articulating surface for articulating with a patient's tibial component; b) the articulating surface including an anterior surface, a distal surface and a posterior condylar surface; c) a kit that includes a plurality of modules that each fit the trial body at the proximal surface, each module including a base portion that fits the proximal surface and a walled portion projecting from the base portion; d) each module being removably attachable to the trial body at the proximal surface; e) the posterior condylar surface having a cutting edge portion that can cut the patient's femur at the femoral condyles during surgical placement of the trial body on the patient's femur; and f) each module having sharp proximal cutting edges.
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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) | 2002-03-08 | 2002-09-07 | 2003-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-03-08 | 2006-09-07 | 2007-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-03-08 | 2010-09-07 | 2011-03-09 | $7700.00 | Window Closed / Lapsed |