US4946458A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pedicle screw
Assignee: Individual
•
Filing: 1989-02-28
•
Granted: 1990-08-07
•
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 17:56
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.
References Cited (Backward Citations)
US958052A
Cited
US3554193A
Cited
US3997138A
Cited
US4135505A
Cited
US4127119A
Cited
US4274401A
Cited
US4456004A
Cited
US4570625A
Cited
DE3306657A1
Cited
US4611582A
Cited
DE3504495A1
Cited
US4569338A
Cited
US4653481A
Cited
US4648388A
Cited
US4648388B1
Cited
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 |