US4838891A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Joint prothesis
Assignee: Individual
•
Filing: 1988-08-08
•
Granted: 1989-06-13
•
Expires: 2008-08-08
Abstract
Abstract This invention relates to a joint prosthesis for permanent anchorage in the bone tissue of a joint in a human body, for instance a knee joint. The joint prosthesis comprises an anchorage device (3, 4; 7-10, 11) disposed to be implanted into the bone tissue at a first operation so that it remains in unloaded condition during a healing phase during which the function of the joint is not prevented and an articulation device (5, 6; 13, 12) which is arranged to be connected to the anchorage device only at a second operation after the said healing phase.
Inventors
- 👤 Per-Ingvar Branemark
- 👤 Bjorn Albrektsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:08
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/38; A61F2/3868; A61F2/3859; A61F2002/3863; A61F2002/3895
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
218 words
A joint prosthesis for permanent anchorage in bone tissue of a joint in a human body, for example, a knee joint, comprising: at least two anchorage devices, at least one of them for implantation into bone tissue of each of the femoral and tibial components, respectively, during a first surgical operation, each of said anchorage devices including at least one fixture leg forming a healing surface towards surrounding bone tissue during a healing phase, said anchorage device remaining in an unloaded condition during said healing to allow functioning of the joint; at least two articulation devices, at least one of them for each of the femoral and tibial components, respectively, each articulation device including a corresponding articulatory surface and connecting means for interconnecting said articulation device to said firmly anchored fixture leg during a second operation subsequent to said healing phase, wherein at least said anchorage devices are made of pure titanium; and, wherein said anchorage device for the femoral component comprises at least two separate internally threaded tubular members forming said leg fixtures insertable from the femur joint surface and said articulation device for the femoral component further comprises an articulatory surface rail part and a separate interconnecting L-shape part connected to said tubular members by two locking screws screwed into threaded interior of said tubular members.
Claim 2
Dependent Claim
218 words
A joint prosthesis for permanent anchorage in bone tissue of a joint in a human body, for example, a knee joint, comprising: at least two anchorage devices, at least one of them for implantation into bone tissue of each of the femoral and tibial components, respectively, during a first surgical operation, each of said anchorage devices including at least one fixture leg forming a healing surface towards surrounding bone tissue during a healing phase, said anchorage device remaining in an unloaded condition during said healing to allow functioning of the joint; at least two articulation devices, at least one of them for each of the femoral and tibial components, respectively, each articulation device including a corresponding articulatory surface and connecting means for interconnecting said articulation device to said firmly anchored fixture leg during a second operation subsequent to said healing phase, wherein at least said anchorage devices are made of pure titanium; and, wherein said anchorage device for the femoral component comprises at least two separate internally threaded tubular members forming said leg fixtures insertable from the femur joint surface and said articulation device for the femoral component further comprises an articulatory surface rail part and a separate interconnecting L-shape part connected to said tubular members by two locking screws screwed into threaded interior of said tubular members.
Claim 3
Dependent Claim
33 words
A joint prosthesis according to claim 1 wherein said fixture leg comprises a tubular member having an external threaded surface, said external threaded surface forming said healing surface contacting said surrounding bone tissue.
Claim 4
Dependent Claim
25 words
A joint prosthesis according to claim 2 wherein said tubular member has a threaded interior for receiving said connecting means for connecting said articulation device.
Claim 5
Dependent Claim
41 words
A joint prosthesis accordidng to claim 1 wherein said articulatory surface rail part includes an L-shaped socket conforming to said interconnecting element and means for securing said articulation device both in the parallel and perpendicular plane to said tubular fixture members.
Claim 6
Dependent Claim
59 words
A joint prosthesis according to claim 4 wherein said anchorage device for the tibial component comprises at least one fixture member insertable from the front in the tibia and said articulation device for the tibial component comprises a medial and/or lateral shaped metal socket and at least one cylindrical guiding road connected to said socket through a vertical beam.
Claim 7
Dependent Claim
31 words
A joint prosthesis according to claim 5 wherein said articulation device for the tibial component comprises a cross beam and two solid cylindrical guiding roads insertable into said tibial fixture members.
Claim 8
Dependent Claim
47 words
A joint prosthesis according to claim 5 wherein said fixture members are provided with a longitudinal sleeve through which said vertical beam of said articulation device is extending when said articulation device is connected to said fixture member in the second operation subsequent to said healing phase.
Claim 9
Dependent Claim
46 words
A joint prosthesis according to claim 5 wherein said medial tibial metal socket is provided with an artificial menisus of polyethylene movably disposed on the plane upper surface of said socket and a posterior edge to limit the magnitude of the movement of the meniscus backwardly.
Claim 10
Dependent Claim
215 words
A joint prosthesis for permanent anchorage in bone tissue of a joint in a human body, for example, a knee joint, comprising: at least two anchorage devices, at least one of them for implantation into bone tissue of each of the femoral and tibial components, respectively, during a first surgical operation, each of said anchorage devices including at least one fixture leg forming a healing surface towards surrounding bone tissue and adapted to be firmly anchored into said tissue during a healing phase, said anchorage device remaining in an unloaded condition during said healing phase to allow functioning of the joint, and; at least two articulation devices, at least one of them for each of the femoral and tibial components, respectively, each articulation device including a corresponding articulatory surface and connecting means for interconnecting said articulation device to said firmly anchored fixture leg during a second operation subsequent to said healing phase, wherein at least said anchorage devices are made of pure titanium; and, wherein said anchorage device for the femoral component comprises at least two separate screw-shaped tubular members forming said leg fixtures and screwable in the bone tissue and said articulation device for the femoral compnent further comprises an articulatory surface part and a separate L-shaped interconnecting part connected to said tubular members.
Claim 11
Dependent Claim
215 words
A joint prosthesis for permanent anchorage in bone tissue of a joint in a human body, for example, a knee joint, comprising: at least two anchorage devices, at least one of them for implantation into bone tissue of each of the femoral and tibial components, respectively, during a first surgical operation, each of said anchorage devices including at least one fixture leg forming a healing surface towards surrounding bone tissue and adapted to be firmly anchored into said tissue during a healing phase, said anchorage device remaining in an unloaded condition during said healing phase to allow functioning of the joint, and; at least two articulation devices, at least one of them for each of the femoral and tibial components, respectively, each articulation device including a corresponding articulatory surface and connecting means for interconnecting said articulation device to said firmly anchored fixture leg during a second operation subsequent to said healing phase, wherein at least said anchorage devices are made of pure titanium; and, wherein said anchorage device for the femoral component comprises at least two separate screw-shaped tubular members forming said leg fixtures and screwable in the bone tissue and said articulation device for the femoral compnent further comprises an articulatory surface part and a separate L-shaped interconnecting part connected to said tubular members.
Claim 12
Dependent Claim
40 words
A joint prosthesis according to claim 9, wherein said articulatory surface part includes an L-shaped socket conforming to said interconnecting part and means for securing said articulation device both in the parallel and perpendicular plane to said tubular fixture members.
References Cited (Backward Citations)
US3521302A
Cited
CA926552A
Cited
FR2266492A1
Cited
FR2330337A1
Cited
FR2378505A1
Cited
US4259072A
Cited
GB2045083A
Cited
US4330891A
Cited
FR2478462A1
Cited
US4353136A
Cited
US4479271A
Cited
DE3417923A1
Cited
DE3429157A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-12 | 1992-12-12 | 1993-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-12 | 1996-12-12 | 1997-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-12 | 2000-12-12 | 2001-06-13 | $7700.00 | Window Closed / Lapsed |