Patent US6099528A successfully refreshed from Google Patents.
US6099528A
Expired / Lapsed
US
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Vertebral rod for spinal osteosynthesis instrumentation and osteosynthesis instrumentation, including said rod
Assignee: Societe de Fabrication de Material Orthopedique en Abrege SOFAMOR SNC
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Filing: 1998-05-28
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Granted: 2000-08-08
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Expires: 2018-05-28
Abstract
Abstract A vertebral rod for fixation of a spine, the rod formed of a first material and defining a passage extending at least partially therethrough, the passage at least partially filled with a second material different from the first material to thereby enable the stiffness of the rod to be varied along its length. The first and second materials are either a metallic material or a biocompatible material such as plastic. The rod may be formed of at least three layers of material, with the layers composed of at least two different materials.
Inventors
- 👤 Jean Saurat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:53
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/70; A61B17/7001; A61B17/7002; A61B17/7019; A61B17/7031; A61B17/7004; A61B17/701; A61B17/7026; A61B17/7049; A61B17/705; A61B90/00; A61B90/03; A61B2090/037
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
63 words
A spinal fixation system, comprising: a rod formed of a first material and defining a passage extending at least partially therethrough, said passage being at least partially filled with a second material different from said first material to vary the stiffness of said rod; and a number of bone anchorage implants, said implants each including a fastener for selective fixation to said rod.
Claim 2
Dependent Claim
63 words
A spinal fixation system, comprising: a rod formed of a first material and defining a passage extending at least partially therethrough, said passage being at least partially filled with a second material different from said first material to vary the stiffness of said rod; and a number of bone anchorage implants, said implants each including a fastener for selective fixation to said rod.
Claim 3
Dependent Claim
17 words
The system of claim 1 wherein said first material has a stiffness different from said second material.
Claim 4
Dependent Claim
19 words
The system of claim 1 wherein at least one of said first material and said second material is metallic.
Claim 5
Dependent Claim
18 words
The system of claim 1 wherein one of said first material and said second material includes a plastic.
Claim 6
Dependent Claim
30 words
The system of claim 1 wherein said first material includes a first metal, and wherein said second material includes a second metal having a stiffness different from said first metal.
Claim 7
Dependent Claim
29 words
The system of claim 1 wherein said first material includes a first metal, and wherein said second material includes a plastic having a stiffness different from said first metal.
Claim 8
Dependent Claim
32 words
The system of claim 1 wherein said rod is formed of at least three layers, at least one of said layers being formed from a different material than another of said layers.
Claim 9
Dependent Claim
25 words
The system of claim 1 wherein said rod has a generally uniform outer cross section, and wherein said passage has a uniform, circular cross section.
Claim 10
Dependent Claim
13 words
The system of claim 1 wherein said passage has a non-circular cross section.
Claim 11
Dependent Claim
17 words
The system of claim 1 wherein said passage has at least two regions defining different cross sections.
Claim 12
Dependent Claim
56 words
A spinal fixation system, comprising: a rod defining a longitudinal central axis and a passage extending at least partially therethrough in a longitudinal direction, said passage being radially offset from said axis to vary stiffness of said rod; and a number bone anchorage implants, said implants each including a fastener for selective fixation to said rod.
Claim 13
Dependent Claim
56 words
A spinal fixation system, comprising: a rod defining a longitudinal central axis and a passage extending at least partially therethrough in a longitudinal direction, said passage being radially offset from said axis to vary stiffness of said rod; and a number bone anchorage implants, said implants each including a fastener for selective fixation to said rod.
Claim 14
Dependent Claim
26 words
The system of claim 11 wherein said rod has a generally uniform outer cross section, and wherein said passage has a generally uniform, circular cross section.
Claim 15
Dependent Claim
13 words
The system of claim 12 wherein said passage has a non-circular cross section.
Claim 16
Dependent Claim
14 words
The system of claim 13 wherein said passage has a generally elliptical cross section.
Claim 17
Dependent Claim
17 words
The system of claim 11 wherein said passage has at least two regions defining different cross sections.
Claim 18
Dependent Claim
58 words
A spinal fixation system, comprising: a rod having a longitudinal axis and defining a passage along only a part of its length, the rod being formed from a metallic material and the passage being at least partially filled with a core material having a stiffness different than the metallic material to correspondingly vary stiffness along the longitudinal axis.
Claim 19
Dependent Claim
58 words
A spinal fixation system, comprising: a rod having a longitudinal axis and defining a passage along only a part of its length, the rod being formed from a metallic material and the passage being at least partially filled with a core material having a stiffness different than the metallic material to correspondingly vary stiffness along the longitudinal axis.
Claim 20
Dependent Claim
26 words
The system of claim 16, further comprising a number of bone anchorage implants, each including a fastener operable to connect said rod to a patient's spine.
Claim 21
Dependent Claim
12 words
The system of claim 16 wherein said core material is a metal.
Claim 22
Dependent Claim
12 words
The system of claim 16 wherein said core material is a plastic.
Claim 23
Dependent Claim
15 words
The system of claim 16 wherein said rod has a generally uniform outer cross section.
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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) | 2003-08-08 | 2004-02-07 | 2004-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-08-08 | 2008-02-07 | 2008-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-08-08 | 2012-02-07 | 2012-08-08 | $7700.00 | Window Closed / Lapsed |