US3872519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Total ankle prosthesis
Assignee: Individual
•
Filing: 1974-04-04
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Granted: 1975-03-25
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Expires: 1994-04-04
Abstract
Abstract The total ankle prosthesis comprises a tibial member and a talar member each having complementary bearing surfaces which are constructed and arranged in such a manner that the normal axial rotation of an ankle about the axis of a tibia during motion of the talus relative to the tibia during flexion and extension is reproduced by the prosthesis.
Inventors
- 👤 Nicholas J Giannestras
- 👤 Giacomo J Sammarco
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:36
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/42; A61F2/4202; A61F2002/30001; A61F2002/30108; A61F2002/3011; A61F2002/30159; A61F2002/30176; A61F2002/30179; A61F2002/30199; A61F2002/30273; A61F2002/30276; A61F2/30767; A61F2/30771; A61F2002/3082; A61F2002/30878; A61F2002/30879; A61F2230/00; A61F2230/0002; A61F2230/0028; A61F2230/0054; A61F2230/0058; A61F2230/0063; A61F2230/0086
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
142 words
An ankle prosthesis comprising a tibial member and a talar member, wherein the talar member includes an upper bearing surface characterized by a central, elongate, arcuate channel having upstanding wing portions on opposite sides thereof, and wherein the tibial member includes a complementary, lower bearing surface characterized by a central depending rib having wing portions on opposite sides thereof; the bearing surface of said talar member being shaped so as to impart limited lateral rotation thereto as it is moved from a central, neutral position to a position of extension with respect to the tibial member, and to impart limited medial rotation thereto as it is moved from a central, neutral position to a position of flexion with respect to said tibial member; said tibial and talar members each including means for attachment to bone structures and providing for substantial articulation thereof.
Claim 2
Dependent Claim
142 words
An ankle prosthesis comprising a tibial member and a talar member, wherein the talar member includes an upper bearing surface characterized by a central, elongate, arcuate channel having upstanding wing portions on opposite sides thereof, and wherein the tibial member includes a complementary, lower bearing surface characterized by a central depending rib having wing portions on opposite sides thereof; the bearing surface of said talar member being shaped so as to impart limited lateral rotation thereto as it is moved from a central, neutral position to a position of extension with respect to the tibial member, and to impart limited medial rotation thereto as it is moved from a central, neutral position to a position of flexion with respect to said tibial member; said tibial and talar members each including means for attachment to bone structures and providing for substantial articulation thereof.
Claim 3
Dependent Claim
55 words
An ankle prosthesis as called for in claim 1, wherein the arcuate channel and wing portions of the bearing surface of the talar member make full and overall contact with the rib and wing portions, respectively, of the bearing surface of the tibial member throughout all positions of the talar member with the tibial member.
Claim 4
Dependent Claim
48 words
An ankle prosthesis as called for in claim 1, wherein the overall width of the bearing surface of the tibial member, between its medial and lateral sides, is substantially equal to the overall width of the bearing surface of the talar member between its medial and lateral sides.
Claim 5
Dependent Claim
69 words
An ankle prosthesis as called for in claim 3, wherein the overall length of the bearing surface of the talar member exceeds the overall length of the bearing surface of the tibial member whereby to provide flexion and extension movement of the talar member relative to the tibial member while maintaining full contact between the bearing surface of the tibial member with the bearing surface of the talar member.
Claim 6
Dependent Claim
27 words
An ankle prosthesis as called for in claim 1, wherein the tibial member is fabricated from a plastic, and wherein the talar member is fabricated fRom metal.
Claim 7
Dependent Claim
36 words
An ankle prosthesis as called for in claim 1, wherein the medial and lateral portions of the bearing surface of the talar member are defined by a cone, the sides of which taper 1 1/2 *.
Claim 8
Dependent Claim
59 words
A prosthesis as called for in claim 1, wherein the shape and contour of the bearing surface of the talar member is such as to impart about 4* medial rotation of said member as it is moved from a central, neutral position to a position of about 23* flexion with respect to the bearing surface of the tibial member.
Claim 9
Dependent Claim
60 words
An ankle prosthesis as called for in claim 1, wherein the shape and contour of the bearing surface of the talar member is such as to impart about 4* lateral rotation to said member as it is moved from a central, neutral position to a position of about 23* extension with respect to the bearing surface of the tibial member.
Claim 10
Dependent Claim
38 words
An ankle prosthesis as called for in claim 4, wherein the front and rear edges of the bearing surface of the tibial member defined the bases of upwardly and outwardly inclined anterior and posterior faces of said member,
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) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |