Patent US4759768A successfully refreshed from Google Patents.
US4759768A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Joint prosthesis, in particular finger joint prosthesis
Assignee: Individual
•
Filing: 1987-02-13
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Granted: 1988-07-26
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Expires: 2007-02-13
Abstract
Abstract A joint prosthesis comprises two pins each designed to be directly or indirectly inserted into a respective one of the two bones to be joined. Operative between the pins are articulation surfaces comprising, in the case of one of the pins, referred to as the carrier pin, two domes centered on an axis perpendicular to the carrier pin, oriented in opposite directions relative to each other and carried by the carrier pin. In the case of the other pin, referred to as the carried pin, the articulation surfaces comprises two further domes each complementary to a respective one of the first-mentioned domes, and thus adapted to be engaged therewith, carried by the carried pin. The domes of the carrier pin are carried by respective pegs which are movable transversely relative to the two pins, the carrier pin comprising two arms each having two respective aligned housings in which the pegs are slidably inserted.
Inventors
- 👤 Thierry Hermann
- 👤 Michel Pequignot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:57
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/42; A61F2/4241; A61F2002/30001; A61F2002/30108; A61F2002/3011; A61F2002/30138; A61F2002/30154; A61F2002/30316; A61F2002/30329; A61F2002/30476; A61F2002/305; A61F2002/30621; A61F2002/30624; A61F2/30767; A61F2/30771; A61F2002/30904; A61F2/32; A61F2002/3241; A61F2002/4243; A61F2220/00; A61F2220/0025; A61F2230/00; A61F2230/0002; A61F2230/0017; A61F2230/0021
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
162 words
Joint prosthesis comprising two pins each designed to be directly or indirectly inserted into a respective one of the two bones to be joined and, operative between said pins, articulation surfaces comprising, in the case of one of the pins, herein referred to for convenience as the carrier pin, two domes centered on an axis perpendicular to said carrier pin, oriented in opposite directions relative to each other and carried by said carrier pin and, for the other of said pins, herein referred to for convenience as the carried pin, two further domes each complementary to a respective one of the first-mentioned domes and thus adapted to be engaged therewith, carried by said carried pin, this joint prosthesis being generally characterized in that the domes of the carrier pin are carried by respective pegs which are movable transversely relative to the two pins, said carrier pin comprising two arms each having two respective aligned housings in which said pegs are slidably inserted.
Claim 2
Dependent Claim
162 words
Joint prosthesis comprising two pins each designed to be directly or indirectly inserted into a respective one of the two bones to be joined and, operative between said pins, articulation surfaces comprising, in the case of one of the pins, herein referred to for convenience as the carrier pin, two domes centered on an axis perpendicular to said carrier pin, oriented in opposite directions relative to each other and carried by said carrier pin and, for the other of said pins, herein referred to for convenience as the carried pin, two further domes each complementary to a respective one of the first-mentioned domes and thus adapted to be engaged therewith, carried by said carried pin, this joint prosthesis being generally characterized in that the domes of the carrier pin are carried by respective pegs which are movable transversely relative to the two pins, said carrier pin comprising two arms each having two respective aligned housings in which said pegs are slidably inserted.
Claim 3
Dependent Claim
27 words
Joint prosthesis according to claim 1, wherein said housings are open to the outside, so that it is possible to operate on said pegs from the outside.
Claim 4
Dependent Claim
24 words
Joint prosthesis according to claim 2, wherein said pegs are fastened to respective caps whereby they cover at least part of the corresponding arms.
Claim 5
Dependent Claim
38 words
Joint prosthesis according to claim 3, wherein each of the arms forms an annular boss in which is the corresponding housing and the cap of the associated peg comprises a skirt through which it surrounds said annular boss.
Claim 6
Dependent Claim
31 words
Joint prosthesis according to claim 1, wherein there are provided between the pegs and the arms that carry them snap-fit means adapted to lock said pegs in position in their housings.
Claim 7
Dependent Claim
15 words
Joint prosthesis according to claim 5, wherein snap-fit means are provided at two different levels.
Claim 8
Dependent Claim
50 words
Joint prosthesis according to claim 4, wherein there are provided between the pegs and the arms that carry them snap-fit means adapted to lock said pegs in position in their housings, the snap-fit means being operative between the annular boss on the arms and the skirt of the corresponding cap.
Claim 9
Dependent Claim
32 words
Joint prosthesis according to claim 1, wherein the arms of the carrier pin embrace a flange of the carried pin, over the surfaces of which extend the respective domes of the latter.
Claim 10
Dependent Claim
26 words
Joint prosthesis according to claim 8, wherein the flange of the carried pin forms a ring into which is chased a member forming the corresponding domes.
Claim 11
Dependent Claim
21 words
Joint prosthesis according to claim 8, wherein the flange of the carried pin is solid and itself forms the corresponding domes.
Claim 12
Dependent Claim
27 words
Joint prosthesis according to claim 8, wherein the flange of the carried pin has a flexible material tire sheating it over at least part of its periphery.
Claim 13
Dependent Claim
38 words
Joint prosthesis according to claim 11, wherein said tire forms part of a member which, transversely, forms a flange through a central opening in which it is engaged on a boss on the flange of the carried pin.
Claim 14
Dependent Claim
21 words
Joint prosthesis according to claim 1, wherein each of the pegs is solid and itself forms the dome that it carries.
Claim 15
Dependent Claim
21 words
Joint prosthesis according to claim 1, wherein a member forming the corresponding dome is chased onto the end of each peg.
Claim 16
Dependent Claim
35 words
Joint prosthesis according to claim 1, wherein there is associated with at least one of the pins a socket into which it is inserted by a tail and relative to which it can move longitudinally.
Claim 17
Dependent Claim
28 words
Joint prosthesis according to claim 15, wherein the pin concerned has a pyramid-shaped external contour and the corresponding socket has a pyramid-shaped internal contour complementary to the latter.
Claim 18
Dependent Claim
50 words
Joint prosthesis according to claim 6, wherein there are provided between the pegs and the arms that carry them snap-fit means adapted to lock said pegs in position in their housings, the snap-fit means being operative between an annular boss on the arms and a skirt of a corresponding cap.
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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) | 1991-07-26 | 1992-01-25 | 1992-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-26 | 1996-01-25 | 1996-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-26 | 2000-01-25 | 2000-07-26 | $7700.00 | Window Closed / Lapsed |