US5176680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for the adjustable fixing of spinal osteosynthesis rods
Assignee: Stryker Corp
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Filing: 1991-02-08
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Granted: 1993-01-05
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Expires: 2011-02-08
Abstract
Abstract The present invention concerns a device for fixing osteosynthesis rods to pedicular screws (1), the device being of the type including a diapason-shaped head (4) defining two branches (4a, 4b) collectively receiving a rod (6) to be fixed, the head being locked in its housing (5) by a locking screw (7), wherein it further includes, threaded on the rod (6) and inserted between the locking screw (7) and the bottom of the housing (5), a split ring (9) whose opposing external faces (10) directed towards the locking screw (7) and said bottom are convex and received in complementary concave surfaces (11, 12) provided on the extremity of the locking screw (7) and the bottom of the receiving housing (5) of the rod (6), the ring (9), prior to locking of the screw (7), allowing for a certain angular clearance of the rod (6) with respect to the axis of the screw (1).
Inventors
- 👤 Jean-Louis Vignaud
- 👤 Philippe Lapresle
- 👤 Jean-Francois Sacriste
- 👤 Gilles Missenard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:55
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/70; A61B17/7001; A61B17/7035; A61B17/704; A61B17/7032; A61B17/84; A61B17/86; A61B17/8695
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
147 words
A device for fixing a spinal osteosynthesis rod, comprising: a pedicle screw having a diapason-shaped head with two spaced branches defining a housing for receiving a rod to be fixed therein, said housing having a bottom surface with a concave surface; a locking screw, coupled to said head, for blocking the rod in said housing, said locking screw having an end with a concave surface; and a split ring configured to be fitted onto the rod and inserted between said locking screw and said bottom surface of said housing, said ring having opposing external convex faces directed toward said locking screw and said bottom surface, respectively, said convex faces engaging and being complimentary to said concave surfaces of said bottom surface and said locking screw; whereby, said ring allows predetermined angular clearance of the rod relative to said pedicle screw prior to tightening of said locking screw.
Claim 2
Independent Claim
147 words
A device for fixing a spinal osteosynthesis rod, comprising: a pedicle screw having a diapason-shaped head with two spaced branches defining a housing for receiving a rod to be fixed therein, said housing having a bottom surface with a concave surface; a locking screw, coupled to said head, for blocking the rod in said housing, said locking screw having an end with a concave surface; and a split ring configured to be fitted onto the rod and inserted between said locking screw and said bottom surface of said housing, said ring having opposing external convex faces directed toward said locking screw and said bottom surface, respectively, said convex faces engaging and being complimentary to said concave surfaces of said bottom surface and said locking screw; whereby, said ring allows predetermined angular clearance of the rod relative to said pedicle screw prior to tightening of said locking screw.
Claim 3
Dependent Claim
15 words
A device according to claim 1 wherein said concave surfaces and convex faces are spherical.
Claim 4
Dependent Claim
21 words
A device according to claim 2 wherein said locking screw comprises a central truncated conical point defining said concave surface thereon.
Claim 5
Dependent Claim
39 words
A device according to claim 3 wherein said bottom surface of said housing has clearance recesses on opposite sides of said concave surface of said bottom surface in inlet areas of said housing, providing angular clearance for the rod.
Claim 6
Dependent Claim
36 words
A device according to claim 3 wherein a cap covers said branches of said pedicle screw and said locking screw, said cap having a central hole providing access to an operating recess in said locking screw.
Claim 7
Dependent Claim
39 words
A device according to claim 2 wherein said bottom surface of said housing has clearance recesses on opposite sides of said concave surface of said bottom surface in inlet areas of said housing, providing angular clearance for the rod.
Claim 8
Dependent Claim
36 words
A device according to claim 2 wherein a cap covers said branches of said pedicle screw and said locking screw, said cap having a central hole providing access to an operating recess in said locking screw.
Claim 9
Dependent Claim
21 words
A device according to claim 1 wherein said locking screw comprises a central truncated conical point defining said concave surface thereon.
Claim 10
Dependent Claim
39 words
A device according to claim 8 wherein said bottom surface of said housing has clearance recesses on opposite sides of said concave surface of said bottom surface in inlet areas of said housing, providing angular clearance for the rod.
Claim 11
Dependent Claim
36 words
A device according to claim 9 wherein a cap covers said branches of said pedicle screw and said locking screw, said cap having a central hole providing access to an operating recess in said locking screw.
Claim 12
Dependent Claim
22 words
A device according to claim 10 wherein said cap comprises opposing scallops on an edge thereof providing angular clearance for the rod.
Claim 13
Dependent Claim
39 words
A device according to claim 1 wherein said bottom surface of said housing has clearance recesses on opposite sides of said concave surface of said bottom surface in inlet areas of said housing, providing angular clearance for the rod.
Claim 14
Dependent Claim
36 words
A device according to claim 12 wherein a cap covers said branches of said pedicle screw and said locking screw, said cap having a central hole providing access to an operating recess in said locking screw.
Claim 15
Dependent Claim
36 words
A device according to claim 1 wherein a cap covers said branches of said pedicle screw and said locking screw, said cap having a central hole providing access to an operating recess in said locking screw.
Claim 16
Dependent Claim
22 words
A device according to claim 14 wherein said cap comprises opposing scallops on an edge thereof providing angular clearance for the rod.
Claim 17
Dependent Claim
32 words
A device according to claim 1 further comprising the rod fitted into said split ring, said rod having a recess for receiving a wrench to rotate said rod about a longitudinal axis.
References Cited (Backward Citations)
US4502473A
Cited
US4483334A
Cited
US4946458A
Cited
DE3722590C1
Cited
US4887596A
Cited
US5047029A
Cited
US5067955A
Cited
EP0408489A1
Cited
WO1991001691A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-01-05 | 1996-07-06 | 1997-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-01-05 | 2000-07-06 | 2001-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-01-05 | 2004-07-06 | 2005-01-05 | $7700.00 | Window Closed / Lapsed |