Patent US5800552A successfully refreshed from Google Patents.
US5800552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanically linked hinged total knee prosthesis
Assignee: IMPLANTOLOGY LLC
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Filing: 1994-10-21
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Granted: 1998-09-01
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Expires: 2014-10-21
Abstract
Abstract A resurfacing type of total knee prosthesis is disclosed which also provides a posterior stabilization function over the entire range of flexion. The knee prosthesis provides primary or supplementary posterior stabilization of the reconstructed knee joint by means of a unique mechanical cam/follower mechanism, which is integrated within the medial and lateral distal condyles of the femoral component to provide functional compensation for lost, resected or incompetent posterior cruciate ligaments or to work in conjunction with surgically retained viable or questionably viable cruciate ligament structures of the reconstructed knee joint. The invention extends to prostheses including a hinge connection that defines a posterior stabilization construction separate from that defined by the condyles. One embodiment of the invention extends individually to the posterior stabilizing hinge assembly.
Inventors
- 👤 Mark R. Forte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:41
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/38; A61F2/3886; A61F2/3836; A61F2/384; A61F2/3845; A61F2/385
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
244 words
A total knee prosthesis capable of providing resurfacing to the adjacent ends of the existing bone structures, as well as total posterior stabilization to the knee joint, comprising: a) a femoral component including: i) a medial condyle having an anterior portion, a distal portion and a posterior portion; ii) a lateral condyle having an anterior portion, a distal portion and a posterior portion; iii) an anterior patellar flange interconnecting the anterior portions of the medial and lateral condyles in parallel, spaced apart relation; and iv) cam member means integral with said medial and lateral condyles and located outboard thereof, said cam member means having an anteriorly located concave cam member surface and a posteriorly located convex cam member surface; b) a tibial component including: i) multi-radius tibial plateau bearing surface means for receiving said medial and lateral condyles for rolling and sliding movement thereon; and ii) follower member means integral with said bearing surface means for receiving the cam surfaces of said cam member means for rotational and sliding movement thereon; and c) hinge means associated with and hingeably connecting said femoral component and said tibial component, said hinge means having a variable axis of rotation and enabling the rotational and sliding contact and anterior-posterior translation to take place between said femoral component and said tibial component; d) the cam member surfaces of said cam member means being in contact with said follower member means for substantially the entire flexion range of the knee.
Claim 2
Dependent Claim
244 words
A total knee prosthesis capable of providing resurfacing to the adjacent ends of the existing bone structures, as well as total posterior stabilization to the knee joint, comprising: a) a femoral component including: i) a medial condyle having an anterior portion, a distal portion and a posterior portion; ii) a lateral condyle having an anterior portion, a distal portion and a posterior portion; iii) an anterior patellar flange interconnecting the anterior portions of the medial and lateral condyles in parallel, spaced apart relation; and iv) cam member means integral with said medial and lateral condyles and located outboard thereof, said cam member means having an anteriorly located concave cam member surface and a posteriorly located convex cam member surface; b) a tibial component including: i) multi-radius tibial plateau bearing surface means for receiving said medial and lateral condyles for rolling and sliding movement thereon; and ii) follower member means integral with said bearing surface means for receiving the cam surfaces of said cam member means for rotational and sliding movement thereon; and c) hinge means associated with and hingeably connecting said femoral component and said tibial component, said hinge means having a variable axis of rotation and enabling the rotational and sliding contact and anterior-posterior translation to take place between said femoral component and said tibial component; d) the cam member surfaces of said cam member means being in contact with said follower member means for substantially the entire flexion range of the knee.
Claim 3
Dependent Claim
39 words
A total knee prosthesis according to claim 1, wherein said hinge means comprises plural spaced apart femoral hinge components, a tibial hinge component located between said femoral hinge components, and a hinge axis comprising a hinge pin extending therebetween.
Claim 4
Dependent Claim
24 words
A total knee prosthesis according to claim 2, wherein said hinge components define a hinge axis passageway for the reception of said hinge pin.
Claim 5
Dependent Claim
25 words
A total knee prosthesis according to claim 3, wherein the portion of said hinge axis passageway defined by said tibial hinge component comprises a slot.
Claim 6
Dependent Claim
25 words
A total knee prosthesis according to claim 4, wherein said hinge means defines a hinge-related posterior stabilization means including said slot and said hinge pin.
Claim 7
Dependent Claim
24 words
A total knee prosthesis according to claim 2, including locking means associated with said femoral hinge components for releasably retaining said hinge pin therein.
Claim 8
Dependent Claim
20 words
A total knee prosthesis according to any of claims 2-4, wherein said hinge means defines a hinge-related posterior stabilization means.
Claim 9
Dependent Claim
32 words
A total knee prosthesis according to claim 7, wherein said hinge-related posterior stabilization means comprises cam means defined by said tibial hinge component and follower means defined by said femoral hinge components.
Claim 10
Dependent Claim
43 words
A total knee prosthesis according to claim 8, wherein said cam means comprises said tibial hinge component, and said follower means comprises an intercondylar housing defined between said femoral hinge components and adapted to receive said tibial hinge component for articulating engagement therein.
Claim 11
Dependent Claim
71 words
A total knee prosthesis according to claim 9, wherein said tibial hinge component comprises a tibial post having opposed lateral peripheral surfaces and an upper peripheral surface; said intercondylar housing has lateral wall surfaces and a roof surface; and wherein respective lateral wall surfaces and lateral peripheral surfaces engage each other in sliding contact, and said roof surface and said upper peripheral surface engage each other in rolling and sliding contact.
Claim 12
Dependent Claim
201 words
A hinge assembly for use in a knee prosthesis adapted to provide hingeable connection between a femoral component and a tibial component of such knee prosthesis, to enable anterior-posterior translation to take place between said femoral component and said tibial component and to offer total posterior stabilization thereto, said hinge assembly comprising: a) plural spaced apart femoral hinge components; b) a tibial hinge component located between said femoral hinge components, said tibial hinge component comprising a tibial post having opposed lateral peripheral surfaces and an upper peripheral surface; c) a hinge axis comprising a hinge pin extending between said femoral hinge components and said tibial hinge component; and d) hinge-related posterior stabilization means comprising cam means comprising said tibial hinge component and follower means defined by said femoral hinge components, said follower means comprising an intercondylar housing defined between said femoral hinge components and adapted to receive said tibial hinge component for articulating engagement therein, and wherein said intercondylar housing has lateral wall surfaces and a roof surface; and wherein respective lateral wall surfaces and lateral peripheral surfaces engage each other in sliding contact, and said roof surface and said upper peripheral surface engage each other in rolling and sliding contact.
Claim 13
Dependent Claim
201 words
A hinge assembly for use in a knee prosthesis adapted to provide hingeable connection between a femoral component and a tibial component of such knee prosthesis, to enable anterior-posterior translation to take place between said femoral component and said tibial component and to offer total posterior stabilization thereto, said hinge assembly comprising: a) plural spaced apart femoral hinge components; b) a tibial hinge component located between said femoral hinge components, said tibial hinge component comprising a tibial post having opposed lateral peripheral surfaces and an upper peripheral surface; c) a hinge axis comprising a hinge pin extending between said femoral hinge components and said tibial hinge component; and d) hinge-related posterior stabilization means comprising cam means comprising said tibial hinge component and follower means defined by said femoral hinge components, said follower means comprising an intercondylar housing defined between said femoral hinge components and adapted to receive said tibial hinge component for articulating engagement therein, and wherein said intercondylar housing has lateral wall surfaces and a roof surface; and wherein respective lateral wall surfaces and lateral peripheral surfaces engage each other in sliding contact, and said roof surface and said upper peripheral surface engage each other in rolling and sliding contact.
Claim 14
Dependent Claim
23 words
A hinge assembly according to claim 11, wherein said hinge components define a hinge axis passageway for the reception of said hinge pin.
Claim 15
Dependent Claim
24 words
A hinge assembly according to claim 12, wherein the portion of said hinge axis passageway defined by said tibial hinge component comprises a slot.
Claim 16
Dependent Claim
19 words
A hinge assembly according to claim 13, wherein said posterior stabilization means includes said slot and said hinge pin.
Claim 17
Dependent Claim
32 words
A hinge assembly according to claim 13 wherein said slot is adapted to be oriented with its longitudinal dimension in a horizontal plane when said hinge assembly is installed and in use.
Claim 18
Dependent Claim
23 words
A hinge assembly according to claim 11, including locking means associated with said femoral hinge components for releasably retaining said hinge pin therein.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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