Patent US4841959A successfully refreshed from Google Patents.
US4841959A
Expired / Lapsed
US
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Spinal/skull fixation device
Assignee: Surgicraft Ltd
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Filing: 1988-09-13
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Granted: 1989-06-27
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Expires: 2008-09-13
Abstract
Abstract A device for fixation of the skull (15) to adjacent bones (18A . . . 18E) of the spine (19) comprises a loop (11) of substantially circular form connecting a pair of legs (12) generally perpendicular to the loop, outward kinks (14) being provided adjacent the junction of the loop and legs, whereby, with the loop secured to the skull by wires (16) and the legs secured to the spine by sublaminae wires (20), wires (20', 20") at both sides of the kinks (14) effect fixation of the skull in relation to the adjacent bones of the spine.
Inventors
- 👤 Andrew O. Ransford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:56
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/70; A61B17/7055; A61B17/7053
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
136 words
A device for fixation of a skull to bones of an adjacent spine comprising biocompatible rod-like material formed in the slope of a loop of substantially circular form terminating in and connecting a pair of generally parallel legs, with the loop and the legs at their junction lying in planes that are generally perpendicular to each other, and the legs being provided adjacent said junction with opposed kinks extending away from each other, whereby, when the loop has been secured to the base of the skull by means of wires passing through holes in the skull and the legs have been secured to bones of an adjacent spine by sublaminae wires, wires engaged round the legs at both sides of the kinks effect fixation of the skull in relation to the adjacent bones of the spine.
Claim 2
Independent Claim
136 words
A device for fixation of a skull to bones of an adjacent spine comprising biocompatible rod-like material formed in the slope of a loop of substantially circular form terminating in and connecting a pair of generally parallel legs, with the loop and the legs at their junction lying in planes that are generally perpendicular to each other, and the legs being provided adjacent said junction with opposed kinks extending away from each other, whereby, when the loop has been secured to the base of the skull by means of wires passing through holes in the skull and the legs have been secured to bones of an adjacent spine by sublaminae wires, wires engaged round the legs at both sides of the kinks effect fixation of the skull in relation to the adjacent bones of the spine.
Claim 3
Dependent Claim
22 words
A device as in claim 1, wherein said substantially circular form constitutes a superior concavity to fit the base of the skull.
Claim 4
Dependent Claim
46 words
A device as in claim 1, said legs terminating in free ends remote from said loop, the legs being formed towards said free ends in a plane curving to the same side as that to which the loop extends from the other ends of the legs.
Claim 5
Dependent Claim
25 words
A device as in claim 1, wherein the legs are elongated so as to be able to continue the fixation segmentally into the dorsal spine.
Claim 6
Dependent Claim
29 words
A device as in claim 4, wherein said elongated legs are provided at or near said ends remote from the loop with a crossbar to maintain the legs parallel.
Claim 7
Dependent Claim
32 words
A device as in claim 1, including further kinks provided along the legs, whereby the legs can be secured to bones of the spine by sublaminae wires engaged with the further kinks.
Claim 8
Dependent Claim
21 words
A device as in claim 1, wherein said rod-like material consists of stainless steel or titanium round rod bent to shape.
Claim 9
Dependent Claim
19 words
A device as in claim 1, wherein said rod-like material is a mould from a fibre reinforced plastics material.
References Cited (Backward Citations)
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Cited
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Cited
FR2611335A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-26 | 1992-12-26 | 1993-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-26 | 1996-12-26 | 1997-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-26 | 2000-12-26 | 2001-06-27 | $7700.00 | Window Closed / Lapsed |