US5609641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tibial prosthesis
Assignee: Smith and Nephew Inc
•
Filing: 1995-01-31
•
Granted: 1997-03-11
•
Expires: 2015-01-31
Abstract
Abstract A tibial prosthesis includes a tibial tray and a post extending therefrom for receiving one or more modular stems of differing sizes. The stem provides a closed socket that registers with the post. A wedge lock fit tightens the stem to the post upon assembly. The stem has a cylindrical section and a tapering section. Fins extend longitudinally from the proximal end to the distal end of the stem, tracking both the cylindrical and tapering portion thereof so that each of the fins tracks a uniform diameter section of the stem for a majority of its length. The tapering section of the stem is equal to about one third of its over all length, and defines the distal end of the stem. The fins are longitudinally placed about the stem exterior surface, and are generally parallel. Between the fins are U-shaped channels that are similarly longitudinally extending and generally parallel. The stem provides a central longitudinal axis. The fins and channels are parallel to the central longitudinal axis of the stem.
Inventors
- 👤 Chris E. Johnson
- 👤 Thomas A. Carls
- 👤 David L. Evans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:32
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/38; A61F2/389; A61F2/30767; A61F2002/30001; A61F2002/30108; A61F2002/3011; A61F2002/30112; A61F2002/30133; A61F2002/30136; A61F2002/30316; A61F2002/30329; A61F2002/30331; A61F2002/30332; A61F2002/30354; A61F2002/30357; A61F2002/30362; A61F2002/30364; A61F2002/30367; A61F2002/30451; A61F2002/30535; A61F2002/30537; A61F2002/30538; A61F2002/3054; A61F2002/30604; A61F2002/30616; A61F2/30771; A61F2002/30772; A61F2002/30784; A61F2002/30785; A61F2002/3082; A61F2002/30841; A61F2002/30845; A61F2002/30878; A61F2002/30879; A61F2002/30891; A61F2002/30892; A61F2220/00; A61F2220/0025; A61F2220/0033; A61F2220/0058; A61F2230/00; A61F2230/0002; A61F2230/0004; A61F2230/0015
Claims Analysis
Total Claims: 41
Claim 1
Independent Claim
183 words
A tibial prosthetic knee component comprising: a) a tibial tray for replacing a portion of the patient's proximal tibia; b) a stem portion having proximal and distal end portions, the stem defining a projection from the tray, forming an angle therewith, for anchoring the tibial tray to the proximal tibia; c) the stem including means at the proximal end portion for attachment to the tray and a distal tip at the distal end portion; d) the stem comprising a generally cylindrically shaped proximal portion and a conically shaped distal portion; e) a plurality of longitudinal extending, generally parallel circumferentially spaced fins extending substantially the length of the stem, the fins communicating with the distal tip; f) a plurality of longitudinally extending channels positioned respectively between the fins, the channels gradually deepening and the fins gradually increasing in radial thickness at greater distances from the distal tip at least at the conically shaped distal portion; and g) a flat surface of generally constant width extending longitudinally between the proximal and distal ends, said flat surface having edges that are generlly parallel to said fins.
Claim 2
Dependent Claim
183 words
A tibial prosthetic knee component comprising: a) a tibial tray for replacing a portion of the patient's proximal tibia; b) a stem portion having proximal and distal end portions, the stem defining a projection from the tray, forming an angle therewith, for anchoring the tibial tray to the proximal tibia; c) the stem including means at the proximal end portion for attachment to the tray and a distal tip at the distal end portion; d) the stem comprising a generally cylindrically shaped proximal portion and a conically shaped distal portion; e) a plurality of longitudinal extending, generally parallel circumferentially spaced fins extending substantially the length of the stem, the fins communicating with the distal tip; f) a plurality of longitudinally extending channels positioned respectively between the fins, the channels gradually deepening and the fins gradually increasing in radial thickness at greater distances from the distal tip at least at the conically shaped distal portion; and g) a flat surface of generally constant width extending longitudinally between the proximal and distal ends, said flat surface having edges that are generlly parallel to said fins.
Claim 3
Dependent Claim
27 words
The tibial prosthetic knee component of claim 1 wherein the fins have tips that are sharp at the distal portion of the stem to cut the bone.
Claim 4
Dependent Claim
151 words
A tibial prosthetic knee component comprising: a) a tibial tray for replacing a portion of the patient's proximal tibia; b) a stem portion having proximal and distal end portions, the stem defining a projection from the tray, forming an angle therewith, for anchoring the tibial tray to the proximal tibia; c) the stem including means for attachment to the tray; d) the stem comprising a generally cylindrically shaped proximal portion and a conically shaped distal portion; e) a plurality of longitudinal extending, generally parallel circumferentially spaced fins extending substantially the length of the stem; f) wherein the fins have tips that are sharp at the distal portion of the stem to cut the bone, wherein the fin tips become less sharp proximally; and g) a flat surface of generally constant width extending longitudinally between the proximal and distal ends, said flat surface having edges that are generally parallel to said fins.
Claim 5
Dependent Claim
151 words
A tibial prosthetic knee component comprising: a) a tibial tray for replacing a portion of the patient's proximal tibia; b) a stem portion having proximal and distal end portions, the stem defining a projection from the tray, forming an angle therewith, for anchoring the tibial tray to the proximal tibia; c) the stem including means for attachment to the tray; d) the stem comprising a generally cylindrically shaped proximal portion and a conically shaped distal portion; e) a plurality of longitudinal extending, generally parallel circumferentially spaced fins extending substantially the length of the stem; f) wherein the fins have tips that are sharp at the distal portion of the stem to cut the bone, wherein the fin tips become less sharp proximally; and g) a flat surface of generally constant width extending longitudinally between the proximal and distal ends, said flat surface having edges that are generally parallel to said fins.
Claim 6
Dependent Claim
12 words
The prosthesis of claim 1 wherein the fins are equally spaced apart.
Claim 7
Dependent Claim
23 words
The prosthesis of claim 1 wherein the fins extend from a hollow cylindrical portion of the stem having a generally tubular inner bore.
Claim 8
Dependent Claim
16 words
The prosthesis of claim 1 wherein the fins are generally triangularly shaped in transverse cross section.
Claim 9
Dependent Claim
14 words
The prosthesis of claim 1 wherein the stem is removably attached to the tray.
Claim 10
Dependent Claim
12 words
The prosthesis of claim 1 wherein the stem and tray are integral.
Claim 11
Dependent Claim
12 words
The prosthesis of claim 1 wherein there are at least 3 fins.
Claim 12
Dependent Claim
19 words
The prosthesis of claim 1 wherein the proximal section and distal sections are integrally jointed at a transition portion.
Claim 13
Dependent Claim
25 words
The prosthesis of claim 1 wherein each fin has an outer edge that includes first and second linear sections that define an obtuse angle therebetween.
Claim 14
Dependent Claim
17 words
The prosthesis of claim 11 wherein the angle is greater than 90 and less than 180 degrees.
Claim 15
Dependent Claim
14 words
The prosthesis of claim 1 wherein each fin is separated by a longitudinal channel.
Claim 16
Dependent Claim
37 words
The prosthesis of claim 1 wherein the stem further comprises a flat surface of generally constant width extending longitudinally between the proximal and distal ends, said flat surface having edges that are generally parallel to said fins.
Claim 17
Dependent Claim
13 words
The prosthesis of claim 1 wherein the stem has a flat distal tip.
Claim 18
Dependent Claim
182 words
A tibial prosthetic knee component comprising: a) a tibial tray for replacing a portion of the patient's proximal tibia; b) a stem portion having proximal and distal end portions, the stem defining a projection from the tray, forming an angle therewith, for anchoring the tibial tray to the proximal tibia; c) the stem including gradually tapering distal section and a generally cylindrically shaped section; d) a plurality of longitudinal extending, generally parallel circumferentially spaced fins extending substantially the length of the stem; e) a plurality of continuous longitudinal channels positioned between the fins and extending substantially the length of the stem, wherein the fins are spaced circumferentially apart about 3 to 180° (3-180 degrees); f) the fin height measured from the core diameter of the cylindrical section to the outer edge flat portion of the fin is 2 mm to 40 mm; and g) a plurality of longitudinally extending channels positioned respectively between the fins, the channels gradually deepening and the fins gradually increasing in radial thickness at greater distances from the distal tip at least at the conically shaped distal portion.
Claim 19
Dependent Claim
182 words
A tibial prosthetic knee component comprising: a) a tibial tray for replacing a portion of the patient's proximal tibia; b) a stem portion having proximal and distal end portions, the stem defining a projection from the tray, forming an angle therewith, for anchoring the tibial tray to the proximal tibia; c) the stem including gradually tapering distal section and a generally cylindrically shaped section; d) a plurality of longitudinal extending, generally parallel circumferentially spaced fins extending substantially the length of the stem; e) a plurality of continuous longitudinal channels positioned between the fins and extending substantially the length of the stem, wherein the fins are spaced circumferentially apart about 3 to 180° (3-180 degrees); f) the fin height measured from the core diameter of the cylindrical section to the outer edge flat portion of the fin is 2 mm to 40 mm; and g) a plurality of longitudinally extending channels positioned respectively between the fins, the channels gradually deepening and the fins gradually increasing in radial thickness at greater distances from the distal tip at least at the conically shaped distal portion.
Claim 20
Dependent Claim
12 words
The prosthesis of claim 16 wherein the channels are equally spaced apart.
Claim 21
Dependent Claim
32 words
The prosthesis of claim 16 wherein the stem is removably attached to the tray and the fins extend from a hollow cylindrical portion of the stem having a generally tubular inner bore.
Claim 22
Dependent Claim
16 words
The prosthesis of claim 16 wherein the fins are generally triangularly shaped in transverse cross section.
Claim 23
Dependent Claim
18 words
The prosthesis of claim 16 further comprising taper locking means for removably attaching the stem to the tray.
Claim 24
Dependent Claim
12 words
The prosthesis of claim 16 wherein there are at least 3 fins.
Claim 25
Dependent Claim
19 words
The prosthesis of claim 16 wherein the proximal section and distal sections are integrally jointed at a transition portion.
Claim 26
Dependent Claim
35 words
The prosthesis of claim 16 wherein each fin has an outer edge that includes proximal and distal linear sections that define an obtuse angle therebetween which is greater than 90 and less than 180 degrees.
Claim 27
Dependent Claim
15 words
The prosthesis of claim 16 further comprising a longitudinally extending flat surface on the stem.
Claim 28
Dependent Claim
18 words
The prosthesis of claim 21 wherein the longitudinal flat surface is between about 0 and 40 mm wide.
Claim 29
Dependent Claim
15 words
The prosthesis of claim 16 wherein the flat surface is generally parallel to the fins.
Claim 30
Dependent Claim
13 words
The prosthesis of claim 16 wherein the stem has a flat distal tip.
Claim 31
Dependent Claim
184 words
A tibial prosthetic knee component comprising: a) a tibial tray for replacing a portion of the patient's proximal tibia; b) a stem portion having proximal and distal end portions, the stem defining a projection from the tray, forming an angle therewith, for anchoring the tibial tray to the proximal tibia; c) the stem comprising a generally cylindrically shaped proximal portion and a gradually tapering distal portion; d) a plurality of longitudinal extending, generally parallel circumferentially spaced fins extending substantially the length of the stem; e) a plurality of continuous longitudinal channels positioned between the fins and extending substantially the length of the stem, wherein the fins are spaced circumferentially apart about 3° to 180° (3-180 degrees); f) the fin height measured from the core diameter of the cylindrical section to the outer edge flat portion of the fin is 2 mm to 40 mm; and g) a plurality of longitudinally extending channels positioned respectively between the fins, the channels gradually deepening and the fins gradually increasing in radial thickness at greater distances from the distal tip at least at the conically shaped distal portion.
Claim 32
Dependent Claim
184 words
A tibial prosthetic knee component comprising: a) a tibial tray for replacing a portion of the patient's proximal tibia; b) a stem portion having proximal and distal end portions, the stem defining a projection from the tray, forming an angle therewith, for anchoring the tibial tray to the proximal tibia; c) the stem comprising a generally cylindrically shaped proximal portion and a gradually tapering distal portion; d) a plurality of longitudinal extending, generally parallel circumferentially spaced fins extending substantially the length of the stem; e) a plurality of continuous longitudinal channels positioned between the fins and extending substantially the length of the stem, wherein the fins are spaced circumferentially apart about 3° to 180° (3-180 degrees); f) the fin height measured from the core diameter of the cylindrical section to the outer edge flat portion of the fin is 2 mm to 40 mm; and g) a plurality of longitudinally extending channels positioned respectively between the fins, the channels gradually deepening and the fins gradually increasing in radial thickness at greater distances from the distal tip at least at the conically shaped distal portion.
Claim 33
Dependent Claim
209 words
A tibial prosthetic knee component comprising: a) a tibial tray for replacing a portion of the patient's proximal tibia; b) a stem portion having proximal and distal end portions, the stem defining a projection from the tray, forming an angle therewith, for anchoring the tibial tray to the proximal tibia; c) the stem including gradually tapering distal section and a generally cylindrically shaped section; d) a plurality of longitudinal extending, generally parallel circumferentially spaced fins extending substantially the length of the stem; e) a plurality of continuous longitudinal channels positioned between the fins and extending substantially the length of the stem, wherein the fins are spaced circumferentially apart about 3° to 180° (3-180 degrees); f) the fin height measured from the core diameter of the cylindrical section to the outer edge flat portion of the fin is 2 mm to 40 mm; g) a plurality of longitudinally extending channels positioned respectively between the fins, the channels gradually deepening and the fins gradually increasing in radial thickness at greater distances from the distal tip at least at the conically shaped distal portion; h) a flat surface of generally constant width extending longitudinally between the proximal and distal ends, said flat surface having edges that are generally parallel to said fins.
Claim 34
Dependent Claim
209 words
A tibial prosthetic knee component comprising: a) a tibial tray for replacing a portion of the patient's proximal tibia; b) a stem portion having proximal and distal end portions, the stem defining a projection from the tray, forming an angle therewith, for anchoring the tibial tray to the proximal tibia; c) the stem including gradually tapering distal section and a generally cylindrically shaped section; d) a plurality of longitudinal extending, generally parallel circumferentially spaced fins extending substantially the length of the stem; e) a plurality of continuous longitudinal channels positioned between the fins and extending substantially the length of the stem, wherein the fins are spaced circumferentially apart about 3° to 180° (3-180 degrees); f) the fin height measured from the core diameter of the cylindrical section to the outer edge flat portion of the fin is 2 mm to 40 mm; g) a plurality of longitudinally extending channels positioned respectively between the fins, the channels gradually deepening and the fins gradually increasing in radial thickness at greater distances from the distal tip at least at the conically shaped distal portion; h) a flat surface of generally constant width extending longitudinally between the proximal and distal ends, said flat surface having edges that are generally parallel to said fins.
Claim 35
Dependent Claim
211 words
A tibial prosthetic knee component comprising: a) a tibial tray for replacing a portion of the patient's proximal tibia; b) a stem portion having proximal and distal end portions, the stem defining a projection from the tray, forming an angle therewith, for anchoring the tibial tray to the proximal tibia; c) the stem comprising a generally cylindrically shaped proximal portion and a gradually tapering distal portion; d) a plurality of longitudinal extending, generally parallel circumferentially spaced fins extending substantially the length of the stem; e) a plurality of continuous longitudinal channels positioned between the fins and extending substantially the length of the stem, wherein the fins are spaced circumferentially apart about 3° to 180° (3-180 degrees); f) the fin height measured from the core diameter of the cylindrical section to the outer edge flat portion of the fin is 2 mm to 40 mm; g) a plurality of longitudinally extending channels positioned respectively between the fins, the channels gradually deepening and the fins gradually increasing in radial thickness at greater distances from the distal tip at least at the conically shaped distal portion; h) a flat surface of generally constant width extending longitudinally between the proximal and distal ends, said flat surface having edges that are generally parallel to said fins.
Claim 36
Dependent Claim
211 words
A tibial prosthetic knee component comprising: a) a tibial tray for replacing a portion of the patient's proximal tibia; b) a stem portion having proximal and distal end portions, the stem defining a projection from the tray, forming an angle therewith, for anchoring the tibial tray to the proximal tibia; c) the stem comprising a generally cylindrically shaped proximal portion and a gradually tapering distal portion; d) a plurality of longitudinal extending, generally parallel circumferentially spaced fins extending substantially the length of the stem; e) a plurality of continuous longitudinal channels positioned between the fins and extending substantially the length of the stem, wherein the fins are spaced circumferentially apart about 3° to 180° (3-180 degrees); f) the fin height measured from the core diameter of the cylindrical section to the outer edge flat portion of the fin is 2 mm to 40 mm; g) a plurality of longitudinally extending channels positioned respectively between the fins, the channels gradually deepening and the fins gradually increasing in radial thickness at greater distances from the distal tip at least at the conically shaped distal portion; h) a flat surface of generally constant width extending longitudinally between the proximal and distal ends, said flat surface having edges that are generally parallel to said fins.
Claim 37
Dependent Claim
160 words
A tibial prosthetic knee component comprising: a) a tibial tray for replacing a portion of the patient's proximal tibia; b) a stem portion having proximal and distal end portions, the stem defining a projection from the tray forming an angle therewith, for anchoring the tibial tray to the patient's proximal tibia; c) the stem being removably attached to the tray; d) the stem including a generally cylindrically-shaped proximal section and a tapered distal section with a pointed distal tip; e) a plurality of longitudinal extending, generally parallel circumferentially spaced fins extending substantially the length of the stem, the fins communicating with the distal tip; f) a plurality of longitudinally extending channels positioned respectively between the fins, the channels gradually deepening and the fins gradually increasing in radial thickness at greater distances from the distal tip at least at the conically shaped distal section; and g) wherein the fins have edges that vary in sharpness between the ends of the stem.
Claim 38
Dependent Claim
160 words
A tibial prosthetic knee component comprising: a) a tibial tray for replacing a portion of the patient's proximal tibia; b) a stem portion having proximal and distal end portions, the stem defining a projection from the tray forming an angle therewith, for anchoring the tibial tray to the patient's proximal tibia; c) the stem being removably attached to the tray; d) the stem including a generally cylindrically-shaped proximal section and a tapered distal section with a pointed distal tip; e) a plurality of longitudinal extending, generally parallel circumferentially spaced fins extending substantially the length of the stem, the fins communicating with the distal tip; f) a plurality of longitudinally extending channels positioned respectively between the fins, the channels gradually deepening and the fins gradually increasing in radial thickness at greater distances from the distal tip at least at the conically shaped distal section; and g) wherein the fins have edges that vary in sharpness between the ends of the stem.
Claim 39
Dependent Claim
37 words
The prosthesis of claim 31 wherein the stem further comprises a flat surface of generally constant width extending longitudinally between the proximal and distal ends, said flat surface having edges that are generally parallel to said fins.
Claim 40
Dependent Claim
123 words
A tibial prosthetic knee component comprising: a) a tibial tray for replacing a portion of the patient's proximal tibia; b) a stem portion having proximal and distal end portions, the stem defining a projection from the tray, forming an angle therewith, for anchoring the tibial tray to the proximal tibia; c) the stem including means for attachment to the tray; d) the stem comprising a generally cylindrically shaped proximal portion and a conically shaped distal portion; e) a plurality of longitudinal extending, generally parallel circumferentially spaced fins extending substantially the length of the stem; and f) wherein the fins have tips that are sharp at the distal portion of the stem to cut the bone, wherein the fin tips become less sharp proximally.
Claim 41
Dependent Claim
123 words
A tibial prosthetic knee component comprising: a) a tibial tray for replacing a portion of the patient's proximal tibia; b) a stem portion having proximal and distal end portions, the stem defining a projection from the tray, forming an angle therewith, for anchoring the tibial tray to the proximal tibia; c) the stem including means for attachment to the tray; d) the stem comprising a generally cylindrically shaped proximal portion and a conically shaped distal portion; e) a plurality of longitudinal extending, generally parallel circumferentially spaced fins extending substantially the length of the stem; and f) wherein the fins have tips that are sharp at the distal portion of the stem to cut the bone, wherein the fin tips become less sharp proximally.
References Cited (Backward Citations)
BE493526A
Cited
US2934065A
Cited
US3064645A
Cited
US4016606A
Cited
US4479271A
Cited
GB2192543A
Cited
US4759767A
Cited
US5108434A
Cited
US4944757A
Cited
US4936853A
Cited
US4938769A
Cited
US5137536A
Cited
US5002578A
Cited
US5116375A
Cited
GB2253147A
Cited
US5246459A
Cited
DE4320086A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-03-10 | 2000-09-09 | 2001-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-03-10 | 2004-09-09 | 2005-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-03-10 | 2008-09-09 | 2009-03-11 | $7700.00 | Window Closed / Lapsed |