US5269784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screw nut for plate osteosynthesis
Assignee: Synthes USA LLC
•
Filing: 1992-02-10
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Granted: 1993-12-14
•
Expires: 2012-02-10
Abstract
Abstract This screw nut (1) is designed for the rigid fixation of a bone screw (15) to a bone plate (20) having plate holes (21). It has a generally cylindrical body (5,6) with a central axis (2), a central hole (3) with a hole axis (34) and an internal thread (4) designed to receive a bone screw (15). The body (5,6) comprises of a lower section (5), an upper section (6), a lower side (9) and an upper side (10). The profile (7) of the upper section (6) orthogonal to said hole axis (34) is smaller than the profile (8) of the lower section (5) orthogonal to said hole axis (34) and the upper section (6) is shaped to be insertable into the plate hole (21) of the bone plate (20).
Inventors
- 👤 Jeffrey W. Mast
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:56
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/80; A61B17/8033; A61B17/8047; A61B17/60; A61B17/8028; A61B17/8052; A61B17/8057; A61B17/809; A61B17/84; A61B17/86; A61B17/8695
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
160 words
An assembly for the internal fixation of bones comprising a bone plate having an upper surface, a lower surface shaped for positioning adjacent a bone to be treated, and a screw hole for accommodating a bone screw, in combination with a nut for fixing a bone screw to said plate, said nut having a central axis, a through hole extending along said axis, a lower section and an upper section, said upper section having a cross section orthogonal to said axis smaller than the cross section of said lower section orthogonal to said axis, thus to form a shoulder at the junction of said upper and lower sections, the upper section of the nut and the plate hole being shaped to coaptly join one another, with said shoulder abutting the lower surface of said plate, at least a part of the through hole of said nut being threaded, to engage a bone screw inserted in the hole in said plate.
Claim 2
Dependent Claim
160 words
An assembly for the internal fixation of bones comprising a bone plate having an upper surface, a lower surface shaped for positioning adjacent a bone to be treated, and a screw hole for accommodating a bone screw, in combination with a nut for fixing a bone screw to said plate, said nut having a central axis, a through hole extending along said axis, a lower section and an upper section, said upper section having a cross section orthogonal to said axis smaller than the cross section of said lower section orthogonal to said axis, thus to form a shoulder at the junction of said upper and lower sections, the upper section of the nut and the plate hole being shaped to coaptly join one another, with said shoulder abutting the lower surface of said plate, at least a part of the through hole of said nut being threaded, to engage a bone screw inserted in the hole in said plate.
Claim 3
Dependent Claim
35 words
The assembly claimed in claim 1, wherein the cross-section of the upper section of the nut has a shape which enables it to be inserted rotationally fixed into said plate hole of said bone plate.
Claim 4
Dependent Claim
24 words
The assembly claimed in claim 2, wherein the cross-section of the upper section of the nut orthogonal to said hole axis is generally elliptical.
Claim 5
Dependent Claim
31 words
The assembly claimed in claim 2 wherein the lower side of the lower section of said nut is provided with projection means for locking the nut to an abutting bone surface.
Claim 6
Dependent Claim
35 words
The assembly claimed in claim 1, wherein the lower section and the upper section of the nut comprise two separate elements connected to one another by means allowing rotation with respect to said central axis.
Claim 7
Dependent Claim
16 words
The assembly claimed in claim 2, wherein said internal thread is in part made of plastics.
Claim 8
Dependent Claim
26 words
The assembly claimed in claim 2, wherein said nut comprises a memory alloy which adopts a smaller volume when heated from lower temperatures to body temperature.
Claim 9
Dependent Claim
30 words
The assembly claimed in claim 1, wherein the lower section of said nut is provided on the lower side with projection means for locking the nut to an abutting surface.
Claim 10
Dependent Claim
18 words
The assembly according to claim 4 or 8, wherein said projections are located symmetrically around said central axis.
Claim 11
Dependent Claim
18 words
The assembly claimed in claim 4 or 8, wherein the projections are located asymmetrically around said central axis.
Claim 12
Dependent Claim
16 words
The assembly claimed in claim 1, wherein the central axis and the hole axis are identical.
Claim 13
Dependent Claim
15 words
The assembly claimed in claim 1, wherein said central axis and said hole axis intersect.
Claim 14
Dependent Claim
46 words
The assembly claimed in claim 2 and further comprising a screw having a head and a bushing seated in the screw hole in said plate at the upper surface of said plate, said bushing having an upper surface shaped to match the head of said screw.
Claim 15
Dependent Claim
23 words
The assembly claimed in claim 1, wherein the cross-section of said upper section orthogonal to said hole axis has a generally rectangular shape.
Claim 16
Dependent Claim
15 words
The assembly claimed in claim 4, wherein the projections are in the form of pins.
Claim 17
Dependent Claim
15 words
The assembly claimed in claim 4, wherein the projections are in the form of wedges.
Claim 18
Dependent Claim
15 words
The assembly claimed in claim 6, wherein the screw thread is a hollow cylindrical insert.
Claim 19
Dependent Claim
11 words
The assembly claimed in claim 8, wherein the projections are pins.
Claim 20
Dependent Claim
11 words
The assembly claimed in claim 8, wherein the projections are wedges.
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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) | 1996-12-13 | 1997-06-14 | 1997-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-12-13 | 2001-06-14 | 2001-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-12-13 | 2005-06-14 | 2005-12-14 | $7700.00 | Window Closed / Lapsed |