US3852830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Knee prosthesis
Assignee: Richards Manufacturing Co LP
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Filing: 1973-02-15
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Granted: 1974-12-10
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Expires: 1993-02-15
Abstract
Abstract Knee prosthesis for permitting total or partial replacement of the articulating surface portions of the knee. Two cooperating components are disclosed, one is a femoral component for attachment to one of the condyles of the femur and the other is a tibial component for attachment to the tibia. The tibial component has a uniform and slightly concave upper surface and the femoral component has a curved polycentric lower face that engages the upper face of the tibial component for closely approximating the natural articulating action of the knee. The femoral component includes fins and an anchoring spike extending remote from its lower face. A femoral template is disclosed for use in preparing the femoral condyles for reception of the femoral components.
Inventors
- 👤 L Marmor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:43
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/38; A61F2002/3895
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
302 words
A knee prosthesis comprising a pair of femoral components for attachment to the condyles of a knee with which used and a pair of corresponding tibial components for attachment to the tibia and respectively engaging said femoral components; each of said tibial components being substantially in the shape of a ''''D'''' as viewed in plan and including a base portion having a substantially cylindrical outer wall, and said base portion having a uniform and slightly concave ungrooved upper face disposed in a portion of an imaginary sphere, said outer wall being of a size slightly smaller than the outside circular portion of the tibia with which used whereby a supporting ridge of bone may be left in the knee with which used around said outer wall of said body portion, cement means on said base portion for holding said base portion to the tibia with which used, each of said femoral components including a body portion having a curved lower face engaging said upper face of a corresponding one of said tibial components, said lower face including a posterior section and an anterior section, said femoral component including anchoring means attached to said body portion remote from said lower face for anchoring said body portion to one of the condyles of the knee with which used, cement means on said body portion for aiding in holding said body portion to the condyle with which used, said posterior section extending rearwardly anD upwardly from said anterior section on a substantially sharper curve than said anterior section, said body portion being provided with upturned side edges for trapping said cement means under said body portion and said anchoring means including a spike attached to said body portion and extending upwardly therefrom, said spike being greater in height than the width of said body portion.
Claim 2
Dependent Claim
302 words
A knee prosthesis comprising a pair of femoral components for attachment to the condyles of a knee with which used and a pair of corresponding tibial components for attachment to the tibia and respectively engaging said femoral components; each of said tibial components being substantially in the shape of a ''''D'''' as viewed in plan and including a base portion having a substantially cylindrical outer wall, and said base portion having a uniform and slightly concave ungrooved upper face disposed in a portion of an imaginary sphere, said outer wall being of a size slightly smaller than the outside circular portion of the tibia with which used whereby a supporting ridge of bone may be left in the knee with which used around said outer wall of said body portion, cement means on said base portion for holding said base portion to the tibia with which used, each of said femoral components including a body portion having a curved lower face engaging said upper face of a corresponding one of said tibial components, said lower face including a posterior section and an anterior section, said femoral component including anchoring means attached to said body portion remote from said lower face for anchoring said body portion to one of the condyles of the knee with which used, cement means on said body portion for aiding in holding said body portion to the condyle with which used, said posterior section extending rearwardly anD upwardly from said anterior section on a substantially sharper curve than said anterior section, said body portion being provided with upturned side edges for trapping said cement means under said body portion and said anchoring means including a spike attached to said body portion and extending upwardly therefrom, said spike being greater in height than the width of said body portion.
Claim 3
Dependent Claim
302 words
A knee prosthesis comprising a pair of femoral components for attachment to the condyles of a knee with which used and a pair of corresponding tibial components for attachment to the tibia and respectively engaging said femoral components; each of said tibial components being substantially in the shape of a ''''D'''' as viewed in plan and including a base portion having a substantially cylindrical outer wall, and said base portion having a uniform and slightly concave ungrooved upper face disposed in a portion of an imaginary sphere, said outer wall being of a size slightly smaller than the outside circular portion of the tibia with which used whereby a supporting ridge of bone may be left in the knee with which used around said outer wall of said body portion, cement means on said base portion for holding said base portion to the tibia with which used, each of said femoral components including a body portion having a curved lower face engaging said upper face of a corresponding one of said tibial components, said lower face including a posterior section and an anterior section, said femoral component including anchoring means attached to said body portion remote from said lower face for anchoring said body portion to one of the condyles of the knee with which used, cement means on said body portion for aiding in holding said body portion to the condyle with which used, said posterior section extending rearwardly anD upwardly from said anterior section on a substantially sharper curve than said anterior section, said body portion being provided with upturned side edges for trapping said cement means under said body portion and said anchoring means including a spike attached to said body portion and extending upwardly therefrom, said spike being greater in height than the width of said body portion.
Claim 4
Dependent Claim
302 words
A knee prosthesis comprising a pair of femoral components for attachment to the condyles of a knee with which used and a pair of corresponding tibial components for attachment to the tibia and respectively engaging said femoral components; each of said tibial components being substantially in the shape of a ''''D'''' as viewed in plan and including a base portion having a substantially cylindrical outer wall, and said base portion having a uniform and slightly concave ungrooved upper face disposed in a portion of an imaginary sphere, said outer wall being of a size slightly smaller than the outside circular portion of the tibia with which used whereby a supporting ridge of bone may be left in the knee with which used around said outer wall of said body portion, cement means on said base portion for holding said base portion to the tibia with which used, each of said femoral components including a body portion having a curved lower face engaging said upper face of a corresponding one of said tibial components, said lower face including a posterior section and an anterior section, said femoral component including anchoring means attached to said body portion remote from said lower face for anchoring said body portion to one of the condyles of the knee with which used, cement means on said body portion for aiding in holding said body portion to the condyle with which used, said posterior section extending rearwardly anD upwardly from said anterior section on a substantially sharper curve than said anterior section, said body portion being provided with upturned side edges for trapping said cement means under said body portion and said anchoring means including a spike attached to said body portion and extending upwardly therefrom, said spike being greater in height than the width of said body portion.
Claim 5
Dependent Claim
131 words
A knee prosthesis femoral component comprising a curved body portion having a lower face including a posterior section and an anterior section, anchoring means attached to said body portion remote from said lower face for anchoring said body portion to one of the condyles of the knee with which used, said anchoring means including a single spike fixedly attached centrally of said body portion and fin means extending in a forwardly and rearwardly direction relative to said body portion for preventing rotation of said body portion relative to the condyle with which used, cement means being provided on said body portion for aiding in holding said body portion to the condyle with which used and in which said body portion is provided with upturned side edges for trapping said cement means.
Claim 6
Dependent Claim
131 words
A knee prosthesis femoral component comprising a curved body portion having a lower face including a posterior section and an anterior section, anchoring means attached to said body portion remote from said lower face for anchoring said body portion to one of the condyles of the knee with which used, said anchoring means including a single spike fixedly attached centrally of said body portion and fin means extending in a forwardly and rearwardly direction relative to said body portion for preventing rotation of said body portion relative to the condyle with which used, cement means being provided on said body portion for aiding in holding said body portion to the condyle with which used and in which said body portion is provided with upturned side edges for trapping said cement means.
Claim 7
Dependent Claim
157 words
A knee prosthesis femoral component comprising a curved body portion having a polycentric curved lower face including a posterior section and an anterior section, anchoring means attached to said body portion remote from said lower face for anchoring said body portion to one of the condyles of the knee with which used, said posterior and anterior sections being respectively disposed on imaginary curves with the curve of said posterior section having a predetermined radius substantially smaller than the predetermined radius of the curve of said anterior section, said body portion being provided with upturned side edges, said anchoring means including a single spike attached to said body portion centrally thereof and extending upwardly therefrom, and fin means attached to said body portion and extending in a forwardly and rearwardly direction away from said spike for engaging one of the condyles of the knee with which used for preventing rotation of said body portion relative to the condyle.
Claim 8
Dependent Claim
157 words
A knee prosthesis femoral component comprising a curved body portion having a polycentric curved lower face including a posterior section and an anterior section, anchoring means attached to said body portion remote from said lower face for anchoring said body portion to one of the condyles of the knee with which used, said posterior and anterior sections being respectively disposed on imaginary curves with the curve of said posterior section having a predetermined radius substantially smaller than the predetermined radius of the curve of said anterior section, said body portion being provided with upturned side edges, said anchoring means including a single spike attached to said body portion centrally thereof and extending upwardly therefrom, and fin means attached to said body portion and extending in a forwardly and rearwardly direction away from said spike for engaging one of the condyles of the knee with which used for preventing rotation of said body portion relative to the condyle.
Claim 9
Dependent Claim
17 words
The knee prosthesis femoral component of claim 3 in which said fin means has a sharpened edge.
Claim 10
Dependent Claim
22 words
The knee prosthesis femoral component of claim 4 in which said fin means is tapered downwardly, forwardly and rearwardly from said spike.
Claim 11
Dependent Claim
104 words
A knee prosthesis comprising a femoral component for attachment to a condyle of the knee with which used and a tibial component for attachment to the tibia and engaging said femoral component, said femoral component including a lower face having a posterior section and an anterior section, said posterior section extending rearwardly and upwardly from said anterior section on a substantially sharper curve than said anterior section, said lower face being transversely curved along its entire length, said tibial component including an upper face disposed in a portion of an imaginary sphere, and said femoral component being less in width than said tibial component.
Claim 12
Dependent Claim
104 words
A knee prosthesis comprising a femoral component for attachment to a condyle of the knee with which used and a tibial component for attachment to the tibia and engaging said femoral component, said femoral component including a lower face having a posterior section and an anterior section, said posterior section extending rearwardly and upwardly from said anterior section on a substantially sharper curve than said anterior section, said lower face being transversely curved along its entire length, said tibial component including an upper face disposed in a portion of an imaginary sphere, and said femoral component being less in width than said tibial component.
Claim 13
Dependent Claim
68 words
The prosthesis of claim 6 in which said femoral component includes anchoring means attached to said body portion remote from said lower face for anchoring said body portion to one of the condyles of the knee with which used and said anchoring means including a spike attached to said body portion and extending upwardly therefrom, said spike being greater in height than the width of said body portion.
Claim 14
Dependent Claim
105 words
A knee prosthesis comprising a femoral component for attachment to a condyle of the knee with which used and a tibial component for attachment to the tibia and engaging said femoral component, said femoral component including a lower face having a posterior section and an anterior section, said posterior section extending rearwardly and upwardly from said anterior section on a substantially sharper curve than said anterior section, said lower face being transversely curved along its entire length, and said tibial component including an upper face disposed in a portion of an imaginary sphere of a greater radius than the transverse curvature of said lower face.
Claim 15
Dependent Claim
105 words
A knee prosthesis comprising a femoral component for attachment to a condyle of the knee with which used and a tibial component for attachment to the tibia and engaging said femoral component, said femoral component including a lower face having a posterior section and an anterior section, said posterior section extending rearwardly and upwardly from said anterior section on a substantially sharper curve than said anterior section, said lower face being transversely curved along its entire length, and said tibial component including an upper face disposed in a portion of an imaginary sphere of a greater radius than the transverse curvature of said lower face.
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) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |