US3869729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bone joint prosthesis
Assignee: National Research Development Corp UK
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Filing: 1972-12-29
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Granted: 1975-03-11
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Expires: 1992-12-29
Abstract
Abstract An endoprosthetic bone joint device, suitable for the knee or other joints, is provided by way of two components of which one is slotted to receive in captive rotatable engagement therein a linkage member projecting from the other. In the direction of the slot, the slotted component has a generally convex bearing surface which engages a similarly directed concave bearing surface on the other component, but in an orthogonal direction the former surface can present two raised portions to engage respective depressions in the latter surface and resulting in a rib and groove along each side of the slot. This double rib groove formation is appropriate to a knee joint device, but can be simplified to singular curvature for another joint such as a finger. Also, the lateral dimension of the slot can progressively vary to allow a progressively varying lateral rocking capability with rotation of the components.
Inventors
- 👤 Christopher Georg Attenborough
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:59
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/42; A61F2/4241; A61F2/38; A61F2/3836; A61F2/3854; A61F2002/30001; A61F2002/30316; A61F2002/30329; A61F2002/30331; A61F2002/30354; A61F2220/00; A61F2220/0025; A61F2220/0033
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
180 words
A endoprosthetic bone joint device comprising: a first component having a convex bearing surface and a slot in such surface which slot terminates in an enlarged cavity within said first component remote from said surface; a second component having a concave bearing surface in mutual articulatory engagement with said convex surface; a linkage member projecting from said concave surface and located in said slot to limit the range of said engagement; and an enlargement at the end of said linkage member remote from said concave surface, which enlargement is housed in said cavity to hold said linkage member captively located in said slot over at least a major portion of said range; one of said components being formed with a passageway communicating with the exterior thereof, which passageway freely receives at least part of said linkage member and enlargement to allow separation of said components; said slot being of progressively varying width to afford a varying limit of articulation between said components in a direction transverse to said slot as the components articulate in the longitudinal direction of said slot.
Claim 2
Dependent Claim
180 words
A endoprosthetic bone joint device comprising: a first component having a convex bearing surface and a slot in such surface which slot terminates in an enlarged cavity within said first component remote from said surface; a second component having a concave bearing surface in mutual articulatory engagement with said convex surface; a linkage member projecting from said concave surface and located in said slot to limit the range of said engagement; and an enlargement at the end of said linkage member remote from said concave surface, which enlargement is housed in said cavity to hold said linkage member captively located in said slot over at least a major portion of said range; one of said components being formed with a passageway communicating with the exterior thereof, which passageway freely receives at least part of said linkage member and enlargement to allow separation of said components; said slot being of progressively varying width to afford a varying limit of articulation between said components in a direction transverse to said slot as the components articulate in the longitudinal direction of said slot.
Claim 3
Dependent Claim
20 words
A device according to claim 1 wherein said convex surface has varying curvature in the longitudinal direction of said slot.
Claim 4
Dependent Claim
31 words
A device according to claim 1 wherein said convex surface has generally spirally varying curvature in the longitudinal direction of said slot, with such curvature increasing as said slot becomes wider.
Claim 5
Dependent Claim
27 words
A device according to claim 1 wherein said passageway is formed in said second component and said linkage member is received in separable longitudinal sliding engagement therein.
Claim 6
Dependent Claim
37 words
A device according to claim 4 wherein said first component is of multi-part construction connected to form said cavity around said enlargement and render said linkage member captively located in said slot through said range of articulaton.
Claim 7
Dependent Claim
49 words
A device according to claim 1 wherein said passageway is formed in said first component at one end of said slot and communicates directly with said slot and said cavity to freely receive said linkage member and said enlargement therefrom at the corresponding limit of said range of articulation.
Claim 8
Dependent Claim
120 words
An endoprosthetic bone joint device comprising: a first component having a first bearing surface and a slot in such surface, which slot terminates in an enlarged cavity located remotely within said first component from said first surface; a second component having a second bearing surface in mutual articulatory engagement with said first surface, and a bore extending into said second component from its bearing surface; and a linkage member including a shaft terminated at one end in an enlarged head, said head being captively movably housed in said cavity, part of said shaft adjacent said head being movably located in said slot, and the end of said shaft remote from said head being separably longitudinally slidably engaged in said bore.
Claim 9
Dependent Claim
120 words
An endoprosthetic bone joint device comprising: a first component having a first bearing surface and a slot in such surface, which slot terminates in an enlarged cavity located remotely within said first component from said first surface; a second component having a second bearing surface in mutual articulatory engagement with said first surface, and a bore extending into said second component from its bearing surface; and a linkage member including a shaft terminated at one end in an enlarged head, said head being captively movably housed in said cavity, part of said shaft adjacent said head being movably located in said slot, and the end of said shaft remote from said head being separably longitudinally slidably engaged in said bore.
Claim 10
Dependent Claim
120 words
An endoprosthetic bone joint device comprising: a first component having a first bearing surface and a slot in such surface, which slot terminates in an enlarged cavity located remotely within said first component from said first surface; a second component having a second bearing surface in mutual articulatory engagement with said first surface, and a bore extending into said second component from its bearing surface; and a linkage member including a shaft terminated at one end in an enlarged head, said head being captively movably housed in said cavity, part of said shaft adjacent said head being movably located in said slot, and the end of said shaft remote from said head being separably longitudinally slidably engaged in said bore.
Claim 11
Dependent Claim
120 words
An endoprosthetic bone joint device comprising: a first component having a first bearing surface and a slot in such surface, which slot terminates in an enlarged cavity located remotely within said first component from said first surface; a second component having a second bearing surface in mutual articulatory engagement with said first surface, and a bore extending into said second component from its bearing surface; and a linkage member including a shaft terminated at one end in an enlarged head, said head being captively movably housed in said cavity, part of said shaft adjacent said head being movably located in said slot, and the end of said shaft remote from said head being separably longitudinally slidably engaged in said bore.
Claim 12
Dependent Claim
42 words
A device according to claim 7 wherein said slot is of progressively varying width to afford a varying limit of articulation between said components in a direction tranSverse to said slot as the components articulate in the longitudinal direction of said slot.
Claim 13
Dependent Claim
71 words
A device according to claim 7 wherein said first bearing surface has convex for with increasing curvature in one sense along the longitudinal direction of said slot, and said slot has progressively increasing width in said one sense therealong to afford an increasing range of articulation in a direction transverse to said slot as said second component articulates relative to said first component in said one sense along said longitudinal direction.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |