Patent US6869433B2 successfully refreshed from Google Patents.
US6869433B2
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyaxial screw with improved locking
Assignee: DePuy Spine LLC
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Filing: 2002-01-11
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Granted: 2005-03-22
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Expires: 2022-01-11
Abstract
Abstract A polyaxial pedicle screw assembly incorporates a concave portion on a receiver which mates with a convex surface on a head of the screw to form a ball joint. The radius of at least a portion of the concave surface is less than a radius of the mating convex portion whereby to create an interference fit.
Inventors
- 👤 Craig Glascott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:17
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/70; A61B17/7001; A61B17/7035; A61B17/7037; F; F16; F16B; F16B35/00; A61B17/7032
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
73 words
A pedicle screw assembly comprising: a screw having a head with a convex portion; a receiver receiving the head and an elongated member; and the receiver having a concave portion, the concave portion having a radius of curvature which is less than a radius of curvature of the convex portion of the head whereby to create an interference fit between the convex portion of the head and the concave portion of the receiver.
Claim 2
Dependent Claim
73 words
A pedicle screw assembly comprising: a screw having a head with a convex portion; a receiver receiving the head and an elongated member; and the receiver having a concave portion, the concave portion having a radius of curvature which is less than a radius of curvature of the convex portion of the head whereby to create an interference fit between the convex portion of the head and the concave portion of the receiver.
Claim 3
Dependent Claim
31 words
A pedicle screw assembly according to claim 1 and further comprising a nut on the receiver which compresses the convex portion of the head into the concave portion of the receiver.
Claim 4
Dependent Claim
20 words
A pedicle screw assembly according to claim 2 wherein the receiver comprises a U-shaped portion for receiving the elongated member.
Claim 5
Dependent Claim
19 words
A pedicle screw assembly according to claim 2 wherein the concave portion of the receiver is formed of titanium.
Claim 6
Dependent Claim
21 words
A pedicle screw assembly according to claim 1 wherein each of the concave portion and convex portion have a spherical shape.
Claim 7
Dependent Claim
67 words
A pedicle screw assembly according to claim 1 wherein the screw comprises an elongated shank having bone threads thereon and the head located at one end thereof; wherein the receiver comprises a body having an aperture therethrough for receiving the shank and having the concave portion located at the aperture; wherein the receiver further comprises a channel therethrough opposite the aperture, the channel receiving the elongate member.
Claim 8
Dependent Claim
76 words
A pedicle screw according to claim 6 and further comprising a compression member between the elongate member and the head; the head having a second convex portion facing the compression member and the compression member having a second concave portion facing the head, the second concave portion having a radius of curvature less than a radius of curvature of the second convex portion whereby to create an interference fit between the head and the compression member.
Claim 9
Dependent Claim
30 words
A pedicle screw according to claim 1 wherein the radius of curvature of the concave portion is about 0.05 mm smaller than the radius of curvature of the convex portion.
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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) | 2008-03-21 | 2008-09-20 | 2009-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2012-03-21 | 2012-09-20 | 2013-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2016-03-21 | 2016-09-20 | 2017-03-22 | $7700.00 | Window Closed / Lapsed |