US4946458A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pedicle screw
Assignee: Individual
•
Filing: 1989-02-28
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Granted: 1990-08-07
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Expires: 2009-02-28
Abstract
Abstract A pedicle screw (1) for use in the monosegmental or multisegmental stabilization of the spinal column comprises a thread and a receiver portion. In order to facilitate the mounting and to reduce the stress of the screw and the threaded rods for connection therewith, a threaded shaft part (2) and a receiver part (3) are mutually connected in an articulated manner.
Inventors
- 👤 Jurgen Harms
- 👤 Lutz Biedermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:51
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/30; A61F2/44; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/70; A61B17/7001; A61B17/7035; A61B17/7037; A61B17/7002; A61B17/7004; A61B17/7008; A61B17/7032; A61B17/7038
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
55 words
A pedicle screw for stabilizing spinal segments comprising a shaft embodying a thread shank, a partially spherical-shaped head at one end of the threaded shaft, a receiver part embodying two halves for receiving the head of the shaft and a ring disposed about said halves for holding the halves in embracing engagement with said head.
Claim 2
Dependent Claim
55 words
A pedicle screw for stabilizing spinal segments comprising a shaft embodying a thread shank, a partially spherical-shaped head at one end of the threaded shaft, a receiver part embodying two halves for receiving the head of the shaft and a ring disposed about said halves for holding the halves in embracing engagement with said head.
Claim 3
Dependent Claim
20 words
A pedicle screw according to claim 1 wherein said receiver halves embody diametrically-opposed, concave, spherical portions engaged with said head.
Claim 4
Dependent Claim
22 words
A pedicle screw according to claim 2 wherein said receiver halves are so dimensioned that there is a gap between the halves.
Claim 5
Dependent Claim
18 words
A pedicle screw according to claim 1 wherein said head comprises means for engagement with a screw driver.
Claim 6
Dependent Claim
27 words
A pedicle screw according to claim 1 wherein said receiver halves contain circumferentially thereof grooves and said ring embodies an internal circumferential projection engaged within said grooves.
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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) | 1993-08-06 | 1994-02-05 | 1994-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-06 | 1998-02-05 | 1998-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-06 | 2002-02-05 | 2002-08-07 | $7700.00 | Window Closed / Lapsed |