US5989254A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pedicle screw assembly
Assignee: Individual
•
Filing: 1998-05-18
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Granted: 1999-11-23
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Expires: 2018-05-18
Abstract
Abstract A pedicle screw assembly consists of a screw having a part spherical head providing a saddle shaped contact surface for a connecting rod, the head is held in a coupling member allowing limited angular movement between the screw and coupling member in one plane only and this plane is at right angles to the contact surface. Surfaces are provided in the connecting member for supporting a connecting rod, which is securable in the coupling member by a cap engaging in the coupling member to clamp the connecting rod against the supporting surfaces while still enabling the screw to move angularly with respect to the coupling member.
Inventors
- 👤 Akiva Raphael Katz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:40
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/70; A61B17/7001; A61B17/7035; A61B17/7037; A61B17/7038; A61B17/7032; A61B17/84; A61B17/86; A61B17/8625; A61B17/8635
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
121 words
A pedicle screw assembly comprising a screw threaded shank with a head at one end shaped to seat in and extend into a coupling member in a manner permitting only limited relative angular movement between the coupling member and the shank in one plane only the coupling member extending beyond the head as a cylindrical sleeve longitudinally slotted partway along its length from its free end so that the base of the slot provides oppositely disposed bearing surfaces for a connecting rod, the head shaped within the coupling member to provide a locating surface for the connecting rod and a driving tool engagement formation; and a removable locking cap in screw threaded engagement with the outer end of the coupling member.
Claim 2
Dependent Claim
121 words
A pedicle screw assembly comprising a screw threaded shank with a head at one end shaped to seat in and extend into a coupling member in a manner permitting only limited relative angular movement between the coupling member and the shank in one plane only the coupling member extending beyond the head as a cylindrical sleeve longitudinally slotted partway along its length from its free end so that the base of the slot provides oppositely disposed bearing surfaces for a connecting rod, the head shaped within the coupling member to provide a locating surface for the connecting rod and a driving tool engagement formation; and a removable locking cap in screw threaded engagement with the outer end of the coupling member.
Claim 3
Dependent Claim
21 words
A pedicle screw assembly as claimed in claim 1 wherein the head and coupling member are complementarily part spherical in shape.
Claim 4
Dependent Claim
26 words
A pedicle screw assembly as claimed in claim 1 wherein the shank projects from the coupling member through a groove which permits the relative angular movement.
Claim 5
Dependent Claim
25 words
A pedicle screw assembly as claimed in claim 3 in which the shank has oppositely disposed flats which bear against the sides of the groove.
Claim 6
Dependent Claim
33 words
A pedicle screw assembly as claimed in claim 1 wherein the driving tool engagement formation is provided by a pair of oppositely disposed flat surfaces extending parallel to the connecting rod locating surface.
Claim 7
Dependent Claim
26 words
A pedicle screw assembly as claimed in claim 1 wherein the locking cap includes a screw threaded stem engaging in a thread within the coupling member.
Claim 8
Dependent Claim
19 words
A pedicle screw assembly as claimed in claim 6 wherein there is a collar located around the coupling member.
Claim 9
Dependent Claim
16 words
A pedicle screw assembly as claimed in claim 6 wherein the screw threads are buttress threads.
Claim 10
Dependent Claim
27 words
A pedicle screw assembly as claimed in claim 1 wherein the screw shank is tapered outwardly towards the head and the free end has a rounded point.
Claim 11
Dependent Claim
31 words
A pedicle screw assembly as claimed in claim 1 wherein the screw head and coupling member are retained together by a radial pin extending through the coupling member into the head.
Claim 12
Dependent Claim
19 words
A pedicle screw assembly as claimed in claim 1 wherein spanner engageable flats are provided on the coupling member.
Claim 13
Dependent Claim
41 words
A pedicle screw assembly as claimed in claim 1, in which the shank has oppositely disposed flats which bear against the sides of a groove in the coupling member to prevent relative rotational movement between the coupling member and the screw.
Claim 14
Dependent Claim
17 words
A pedicle screw assembly as claimed in claim 1, including a collar located around the coupling member.
Claim 15
Dependent Claim
16 words
A pedicle screw member as claimed in claim 1, wherein the screw threads are buttress threads.
Claim 16
Dependent Claim
26 words
A pedicle screw assembly as claimed in claim 2, wherein the shank projects from the coupling member through a groove which permits the relative angular movement.
Claim 17
Dependent Claim
33 words
A pedicle screw assembly as claimed in claim 15, wherein the driving tool engagement formation is provided by a pair of oppositely disposed flat surfaces extending parallel to the connecting rod locating surface.
Claim 18
Dependent Claim
26 words
A pedicle screw assembly as claimed in claim 16, wherein the locking cap includes a screw threaded stem engaging in a thread within the coupling member.
Claim 19
Dependent Claim
27 words
A pedicle screw assembly as claimed in claim 17, wherein the screw shank is tapered outwardly towards the head and the free end has a rounded point.
Claim 20
Dependent Claim
31 words
A pedicle screw assembly as claimed in claim 1, wherein the screw head and coupling member are retained together by a radial pin extending though the coupling member into the head.
Claim 21
Dependent Claim
19 words
A pedicle screw assembly as claimed in claim 19, wherein spanner engageable flats are provided on the coupling member.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-11-22 | 2003-05-24 | 2003-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-11-22 | 2007-05-24 | 2007-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-11-22 | 2011-05-24 | 2011-11-23 | $7700.00 | Window Closed / Lapsed |