US5129388A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for supporting the spinal column
Assignee: Stryker Corp
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Filing: 1990-02-08
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Granted: 1992-07-14
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Expires: 2010-02-08
Abstract
Abstract A device for supporting a spinal column includes a screw having a U-shaped head, a joining element received within the head, a threaded bolt received within and threadedly engaging the head, and a cap covering an upper portion of the head. The head is internally threaded. The threaded bolt engages the joining element to block relative movement between the joining element and the screw. The cap avoids spreading of the head upon tightening of the bolt in the head.
Inventors
- 👤 Jean-Louis Vignaud
- 👤 Jean-Francois Sacriste
- 👤 Gilles Missenard
- 👤 Philippe Lapresle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:24
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/70; A61B17/7001; A61B17/7002; A61B17/7004; A61B17/7032; A61B17/7005; A61B17/84; A61B17/86; A61B17/8695; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2002/30001; A61F2002/30316; A61F2002/30329; A61F2002/30433; A61F2220/00; A61F2220/0025; A61F2220/0041
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
79 words
A device for supporting a spinal column, comprising: a screw having a U-shaped head, said head being internally threaded; a joining element received within said head; an externally threaded bolt received within and threadedly engaging said head, and engaging said joining element to block relative movement between said joining element and said screw; and a cap covering an upper outer portion of said U-shaped head to avoid spreading of said head upon tightening of said bolt in said head.
Claim 2
Independent Claim
79 words
A device for supporting a spinal column, comprising: a screw having a U-shaped head, said head being internally threaded; a joining element received within said head; an externally threaded bolt received within and threadedly engaging said head, and engaging said joining element to block relative movement between said joining element and said screw; and a cap covering an upper outer portion of said U-shaped head to avoid spreading of said head upon tightening of said bolt in said head.
Claim 3
Dependent Claim
29 words
A device according to claim 1 wherein said screw comprises external threads having a conicity which differs between a core of said threads and a top of said threads.
Claim 4
Dependent Claim
37 words
A device according to claim 1 wherein said upper portion of said U-shaped head has a generally cylindrical outer surface with upper and lower sections, said upper section having a smaller transverse diameter than said lower section.
Claim 5
Dependent Claim
28 words
A device according to claim 1 wherein said U-shaped head has an internal bottom portion which receives said joining element, said bottom portion being rounded in two planes.
Claim 6
Dependent Claim
29 words
A device according to claim 1 wherein said screw comprises a section connecting said U-shaped head to an externally threaded portion thereof, said section being a concave-shaped quarter circle.
Claim 7
Dependent Claim
42 words
A device according to claim 1 wherein said bolt comprises a conical base; and said joining element comprises a series of longitudinally spaced, preformed notches, one of said notches receiving said conical base when said bolt is tightened in said U-shaped head.
Claim 8
Dependent Claim
35 words
A device according to claim 3 wherein said cap comprises a generally cylindrical inner surface mating with said upper section of said outer surface of said U-shaped head to provide a tight sliding connection therebetween.
Claim 9
Dependent Claim
31 words
A device according to claim 7 wherein said cap comprises a top section with a circular orifice for allowing a tool to pass through said cap and to engage said bolt.
Claim 10
Dependent Claim
21 words
A device according to claim 8 wherein said bolt has an upper section with means for receiving and engaging the tool.
Claim 11
Dependent Claim
39 words
A device according to claim 1 wherein said joining element comprises a rod with a cylindrical section and preformed conical notches on a periphery of said rod; and said bolt having a base received in one of said notches.
Claim 12
Dependent Claim
26 words
A device according to claim 10 wherein said notches are machines at various pitches for micrometric positioning adjustment of said joining element in said U-shaped head.
Claim 13
Dependent Claim
15 words
A device according to claim 1 wherein said joining element is coupled to other devices.
Claim 14
Dependent Claim
16 words
A device according to claim 1 wherein said cap comprises a generally cylindrical, unthreaded inner surface.
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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) | 1995-07-14 | 1996-01-13 | 1996-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-14 | 2000-01-13 | 2000-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-14 | 2004-01-13 | 2004-07-14 | $7700.00 | Window Closed / Lapsed |