US3940804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ankle block
Assignee: HOSMER DORRANCE CORP
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Filing: 1975-03-10
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Granted: 1976-03-02
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Expires: 1995-03-10
Abstract
Abstract An ankle block for joining a leg prosthesis to a foot prosthesis includes a generally cylindrical member formed of rigid foam material, and a metal or wood insert molded in place in the lower end of the cylindrical member. The insert includes flanges which anchor it firmly in the foam, and a hole extending axially therethrough for receiving and anchoring a bolt from the prosthetic foot. An upper cylindrical passage extends from the upper end of the block to the insert, and a lower cylindrical passage of smaller diameter extends likewise from the lower end. The insert is adapted to receive and anchor either a bolt from a Sach foot, or a tee-bolt from a single-axis foot prosthesis.
Inventors
- 👤 Cecil Thomas Benton
- 👤 John Maher Freter
- 👤 Robert R. Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:40
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/50; A61F2/60; A61F2/66; A61F2/6607; A61F2002/6614
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
135 words
A prosthetic ankle block comprising a generally cylindrical member contoured to resemble a human ankle and cast of rigid foam material, including an anchoring insert imbedded in said foam material for anchoring a prosthetic foot to said ankle block; said insert including an upper cylindrical portion having an upper flange extending radially outwardly therefrom into said foam material, a medial portion comprising a frusto-conical member integrally formed with and subjacent to said upper portion, and a lower flange extending radially outwardly from the lower, narrow end of the medial portion; said insert including a hole extending axially therethrough and a counterbore extending into the end surface of the upper portion thereof; and said ankle block including an upper passage communicating with said counterbore and a lower passage extending to the lower opening of said hole.
Claim 2
Dependent Claim
135 words
A prosthetic ankle block comprising a generally cylindrical member contoured to resemble a human ankle and cast of rigid foam material, including an anchoring insert imbedded in said foam material for anchoring a prosthetic foot to said ankle block; said insert including an upper cylindrical portion having an upper flange extending radially outwardly therefrom into said foam material, a medial portion comprising a frusto-conical member integrally formed with and subjacent to said upper portion, and a lower flange extending radially outwardly from the lower, narrow end of the medial portion; said insert including a hole extending axially therethrough and a counterbore extending into the end surface of the upper portion thereof; and said ankle block including an upper passage communicating with said counterbore and a lower passage extending to the lower opening of said hole.
Claim 3
Dependent Claim
24 words
The prosthetic ankle block of claim 1, wherein said hole in said insert is threaded to receive an anchoring bolt of a prosthetic foot.
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) | 1979-03-02 | 1979-09-01 | 1980-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-02 | 1983-09-01 | 1984-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-02 | 1987-09-01 | 1988-03-02 | $7700.00 | Window Closed / Lapsed |