US5062852A
Expired / Lapsed
US
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Tibial prosthesis with independent medial and lateral baseplates
Assignee: Zimmer Inc
•
Filing: 1990-02-09
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Granted: 1991-11-05
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Expires: 2010-02-09
Abstract
Abstract A tibial prosthesis with independent medial and lateral baseplates. The baseplates can be coupled together for simultaneous implantation using an implantation apparatus. A high-molecular weight polyethylene upper part with articulating surface can then be attached both to the baseplates and to the tibia. The resulting prosthesis can conform to the stabil condition of the tibia without rocking in the baseplates. Bony ingrowth from the tibial head into special surfaces of the baseplates securely attaches the baseplates to the tibial head and the possibility of diminished fixation is reduced.
Inventors
- 👤 Lawrence D. Dorr
- 👤 Brian D. Burkinshaw
- 👤 Joseph S. Skraba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:13
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/38; A61F2/389; A61F2/46; A61F2/4603; A61F2/461; A61F2002/3895; A61F2002/4625; A61F2002/4627
Claims Analysis
Total Claims: 51
Claim 1
Independent Claim
124 words
A tibial prosthesis comprising a separate medial baseplate adapted to be affixed to a medial surface at a head of a patient's tibia, said medial baseplate having a bottom side and a top side; means on said bottom side of said medial baseplate for independently securing said baseplate to said tibia; a separate lateral baseplate adapted to be affixed to a lateral surface at the head of the tibia, said lateral baseplate having a bottom side and a top side; means on said bottom side of said lateral baseplate for independently securing said baseplate to said tibia; and an upper part having medial and lateral articulating surfaces and connected to both the medial baseplate and the lateral baseplate, respectively, at the top sides thereof.
Claim 2
Dependent Claim
124 words
A tibial prosthesis comprising a separate medial baseplate adapted to be affixed to a medial surface at a head of a patient's tibia, said medial baseplate having a bottom side and a top side; means on said bottom side of said medial baseplate for independently securing said baseplate to said tibia; a separate lateral baseplate adapted to be affixed to a lateral surface at the head of the tibia, said lateral baseplate having a bottom side and a top side; means on said bottom side of said lateral baseplate for independently securing said baseplate to said tibia; and an upper part having medial and lateral articulating surfaces and connected to both the medial baseplate and the lateral baseplate, respectively, at the top sides thereof.
Claim 3
Dependent Claim
14 words
The tibial prosthesis according to claim 1 wherein the upper part is plastically deformable.
Claim 4
Dependent Claim
25 words
The tibial prosthesis according to claim 2 wherein the upper part further comprises means for attaching the upper part to the head of the tibia.
Claim 5
Dependent Claim
15 words
The tibial prosthesis according to claim 3 wherein the attaching means comprise a cruciate stem.
Claim 6
Dependent Claim
35 words
The tibial prosthesis according to claim 1 wherein each of the baseplates further comprises means for releasibly attaching the respective baseplate to means for securing the baseplates in fixed relationship to each other during implantation.
Claim 7
Dependent Claim
24 words
The tibial prosthesis according to claim 1 wherein each baseplate further comprises means for forming an interference connection with the head of the tibia.
Claim 8
Dependent Claim
15 words
The tibial prosthesis according to claim 6 wherein the connection forming means comprise a cylinder.
Claim 9
Dependent Claim
16 words
The tibial prosthesis according to claim 6 wherein the connection forming means comprises a truncated cone.
Claim 10
Dependent Claim
27 words
The tibial prosthesis according to claim 1 further comprising connecting means for making a non-rigid connection between the upper part and at least one of the baseplates.
Claim 11
Dependent Claim
14 words
The tibial prosthesis according to claim 9 wherein the upper part is plastically deformable.
Claim 12
Dependent Claim
25 words
The tibial prosthesis according to claim 10 wherein the upper part further comprises means for attaching the upper part to the head of the tibia.
Claim 13
Dependent Claim
15 words
The tibial prosthesis according to claim 11 wherein the attaching means comprise a cruciate stem.
Claim 14
Dependent Claim
35 words
The tibial prosthesis according to claim 9 wherein each of the baseplates further comprises means for releasibly attaching the respective baseplate to means for securing the baseplates in fixed relationship to each other during implantation.
Claim 15
Dependent Claim
24 words
The tibial prosthesis according to claim 13 wherein each baseplate further comprises means for forming an interference connection with the head of the tibia.
Claim 16
Dependent Claim
15 words
The tibial prosthesis according to claim 14 wherein the connection forming means comprise a cylinder.
Claim 17
Dependent Claim
16 words
The tibial prosthesis according to claim 14 wherein the connection forming means comprise a truncated cone.
Claim 18
Dependent Claim
24 words
The tibial prosthesis according to claim 9 wherein each baseplate further comprises means for forming an interference connection with the head of the tibia.
Claim 19
Dependent Claim
15 words
The tibial prosthesis according to claim 17 wherein the connection forming means comprise a cylinder.
Claim 20
Dependent Claim
16 words
The tibial prosthesis according to claim 18 wherein the connection forming means comprise a truncated cone.
Claim 21
Dependent Claim
45 words
The tibial prosthesis according to claim 9 wherein the connecting means comprises first connecting means for making a non-rigid connection between the upper part and the medial baseplate and second connecting means for making a non-rigid connection between the upper part and the lateral baseplate.
Claim 22
Dependent Claim
14 words
The tibial prosthesis according to claim 20 wherein the upper part is plastically deformable.
Claim 23
Dependent Claim
25 words
The tibial prosthesis according to claim 21 wherein the upper part further comprises means for attaching the upper part to the head of the tibia.
Claim 24
Dependent Claim
15 words
The tibial prosthesis according to claim 22 wherein the attaching means comprise a cruciate stem.
Claim 25
Dependent Claim
35 words
The tibial prosthesis according to claim 20 wherein each of the baseplates further comprises means for releasibly attaching the respective baseplate to means for securing the baseplates in fixed relationship to each other during implantation.
Claim 26
Dependent Claim
24 words
The tibial prosthesis according to claim 24 wherein each baseplate further comprises means for forming an interference connection with the head of the tibia.
Claim 27
Dependent Claim
15 words
The tibial prosthesis according to claim 25 wherein the connection forming means comprise a cylinder.
Claim 28
Dependent Claim
16 words
The tibial prosthesis according to claim 25 wherein the connection forming means comprise a truncated cone.
Claim 29
Dependent Claim
24 words
The tibial prosthesis according to claim 20 wherein each baseplate further comprises means for forming an interference connection with the head of the tibia.
Claim 30
Dependent Claim
15 words
The tibial prosthesis according to claim 28 wherein the connection forming means comprise a cylinder.
Claim 31
Dependent Claim
16 words
The tibial prosthesis according to claim 29 wherein the connection forming means comprise a truncated cone.
Claim 32
Dependent Claim
35 words
The tibial prosthesis according to claim 20 wherein the first and second connecting means each comprise a male snap connector on the upper part and a female connector on the medial and lateral baseplates respectively.
Claim 33
Dependent Claim
14 words
The tibial prosthesis according to claim 31 wherein the upper part is plastically deformable.
Claim 34
Dependent Claim
25 words
The tibial prosthesis according to claim 32 wherein the upper part further comprises means for attaching the upper part to the head of the tibia.
Claim 35
Dependent Claim
15 words
The tibial prosthesis according to claim 33 wherein the attaching means comprise a cruciate stem.
Claim 36
Dependent Claim
35 words
The tibial prosthesis according to claim 31 wherein each of the baseplates further comprises means for releasibly attaching the respective baseplate to means for securing the baseplates in fixed relationship to each other during implantation.
Claim 37
Dependent Claim
24 words
The tibial prosthesis according to claim 35 wherein each baseplate further comprises means for forming an interference connection with the head of the tibia.
Claim 38
Dependent Claim
15 words
The tibial prosthesis according to claim 36 wherein the connection forming means comprise a cylinder.
Claim 39
Dependent Claim
16 words
The tibial prosthesis according to claim 36 wherein the connection forming means comprise a truncated cone.
Claim 40
Dependent Claim
24 words
The tibial prosthesis according to claim 31 wherein each baseplate further comprises means for forming an interference connection with the head of the tibia.
Claim 41
Dependent Claim
15 words
The tibial prosthesis according to claim 39 wherein the connection forming means comprise a cylinder.
Claim 42
Dependent Claim
16 words
The tibial presthesis according to claim 39 wherein the connection forming means comprise a truncated cone.
Claim 43
Independent Claim
98 words
A method for implanting a prosthetic tibia comprising the steps of: resecting a generally flat surface at a head of a tibia; preparing the surface to receive the tibial implant; attaching a medial baseplate and a lateral baseplate to an apparatus adapted to hold the separate medial baseplate and the separate lateral baseplate in fixed relationship to each other; securing the medial baseplate and the lateral baseplate to the resected surface; removing the apparatus from the baseplates; and attaching an upper part having medial and lateral articulating surfaces to both the medial baseplate and the lateral baseplate, respectively.
Claim 44
Independent Claim
98 words
A method for implanting a prosthetic tibia comprising the steps of: resecting a generally flat surface at a head of a tibia; preparing the surface to receive the tibial implant; attaching a medial baseplate and a lateral baseplate to an apparatus adapted to hold the separate medial baseplate and the separate lateral baseplate in fixed relationship to each other; securing the medial baseplate and the lateral baseplate to the resected surface; removing the apparatus from the baseplates; and attaching an upper part having medial and lateral articulating surfaces to both the medial baseplate and the lateral baseplate, respectively.
Claim 45
Dependent Claim
23 words
The method according to claim 42 wherein the step of attaching the upper part further comprises affixing the upper part to the tibia.
Claim 46
Dependent Claim
25 words
The method according to claim 43 wherein the step of affixing the upper part to the tibia comprises driving a cruciate stem into the tibia.
Claim 47
Dependent Claim
46 words
The method according to claim 42 wherein the preparing step further comprises placing a template on the resected surface; milling cavities into the tibia, said cavities being adapted to receive means on the baseplates for affixing the respective baseplates to the tibia; and removing the template.
Claim 48
Dependent Claim
36 words
The method according to claim 45 wherein the step of securing the medial and lateral baseplates comprises pressing the affixing means into a cavity and forming an interference fit between the tibia and the affixing means.
Claim 49
Dependent Claim
86 words
The method according to claim 46 wherein the preparing step further comprises attaching a medial trial baseplate and a lateral trial baseplate to the holding apparatus; securing the medial trial baseplate and the lateral trial baseplate to the resected surface; removing the apparatus from the trial baseplates; attaching a trial upper part having an articulating surface to both the medial trial baseplate and the lateral trial baseplate to form a trial tibial prosthesis; testing for proper articulation in the patient's knee; and removing the trial prosthesis.
Claim 50
Dependent Claim
23 words
The method according to claim 47 wherein the step of attaching the upper part further comprises affixing the upper part to the tibia.
Claim 51
Dependent Claim
25 words
The method according to claim 48 wherein the step of affixing the upper part to the tibia comprises driving a cruciate stem into the tibia.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-11-04 | 1995-05-06 | 1995-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-04 | 1999-05-06 | 1999-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-04 | 2003-05-06 | 2003-11-05 | $7700.00 | Window Closed / Lapsed |