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US6660004B2
Expired / Lapsed
US
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Multi-axial bone screw assembly
Assignee: SDGI Holdings Inc
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Filing: 2001-08-28
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Granted: 2003-12-09
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Expires: 2021-08-28
Abstract
Abstract A bottom-loading multi-axial bone anchor apparatus is disclosed. The apparatus includes a receiver member, a crown member, a bone anchor and a retaining member. The receiver member defines an upper opening and a lower opening, which may form part of the same opening, a channel, and a groove. The crown member and bone anchor are loaded into the lower opening of the receiver member, and the retaining member fits around the bone anchor and into the groove in the receiver member. The bone anchor is capable of multi-axial positioning with respect to the receiver member. An elongated member is placed in the channel of the receiver member, contacting the crown member, and a compression member is applied via the upper opening. The compression member presses down on the elongated member, which presses down on the crown member and locks the bone anchor between the crown member and the retaining member.
Inventors
- 👤 B. Thomas Barker
- 👤 John Stewart Young
- 👤 Craig Squires
- 👤 David Brumfield
- 👤 Chris Johnson
- 👤 Dennis J. Buchanan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:16
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/70; A61B17/7001; A61B17/7035; A61B17/7037; A61B17/7032; A61B2017/00831; A61B2017/00858; A61B90/00; A61B90/03; A61B2090/037
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
66 words
An medical implant apparatus, comprising a receiver member having a longitudinal axis and defining an upper opening portion and a lower opening portion, a channel transverse to and communicating with said upper opening portion, and an interior groove in said member substantially perpendicular to said axis; and a substantially planar retaining member having an inner dimension and an outer dimension, said retaining member occupying said groove.
Claim 2
Dependent Claim
66 words
An medical implant apparatus, comprising a receiver member having a longitudinal axis and defining an upper opening portion and a lower opening portion, a channel transverse to and communicating with said upper opening portion, and an interior groove in said member substantially perpendicular to said axis; and a substantially planar retaining member having an inner dimension and an outer dimension, said retaining member occupying said groove.
Claim 3
Dependent Claim
18 words
The apparatus of claim 1 , wherein said groove communicates with said lower opening portion of said member.
Claim 4
Dependent Claim
16 words
The apparatus of claim 1 , wherein said retaining member is a substantially circular ring member.
Claim 5
Dependent Claim
25 words
The apparatus of claim 3 , wherein said ring member includes a gap whereby said ring member can be contracted for insertion into said groove.
Claim 6
Dependent Claim
25 words
The apparatus of claim 1 , wherein when said retaining member is within said groove, said retaining member is substantially immovable in a radial direction.
Claim 7
Dependent Claim
32 words
The apparatus of claim 1 , further comprising a bone anchor having a head within said receiver member, said head having a diameter larger than said inner dimension of said retaining member.
Claim 8
Dependent Claim
24 words
The apparatus of claim 6 , wherein said head of said bone anchor is substantially between said retaining member and said upper opening portion.
Claim 9
Dependent Claim
41 words
The apparatus of claim 7 , further comprising a crown member movably disposed in said receiver member and having an upper surface and a lower surface, said lower surface contacting said head of said bone engaging anchor in a locked mode.
Claim 10
Dependent Claim
38 words
The apparatus of claim 7 , wherein said receiver has a top portion proximate to said upper opening and a bottom portion proximate to said lower opening portion, and said top portion is thinner than said bottom portion.
Claim 11
Dependent Claim
121 words
A medical implant apparatus, comprising a receiver member having an upper aperture, a lower aperture and a hole extending between said apertures, a channel through said receiver member substantially perpendicular to said hole, said hole including a groove in said receiver member; a bone engaging anchor having a head portion and a lower bone engaging portion, said head portion being within said hole such that said bone engaging anchor extends through said lower aperture; a substantially planar ring having an inner dimension smaller than said head portion, wherein said ring is at least partially within said groove such that said head of said bone engaging anchor is retained within said chamber, and said ring is substantially unmovable in a radial direction.
Claim 12
Dependent Claim
121 words
A medical implant apparatus, comprising a receiver member having an upper aperture, a lower aperture and a hole extending between said apertures, a channel through said receiver member substantially perpendicular to said hole, said hole including a groove in said receiver member; a bone engaging anchor having a head portion and a lower bone engaging portion, said head portion being within said hole such that said bone engaging anchor extends through said lower aperture; a substantially planar ring having an inner dimension smaller than said head portion, wherein said ring is at least partially within said groove such that said head of said bone engaging anchor is retained within said chamber, and said ring is substantially unmovable in a radial direction.
Claim 13
Dependent Claim
35 words
The apparatus of claim 10 , wherein said head portion is movable within said chamber such that said head portion may be either in contact with said ring or not in contact with said ring.
Claim 14
Dependent Claim
33 words
The apparatus of claim 11 , wherein when said head portion contacts said ring, the portion of said head portion in contact with said ring is substantially in the plane of the ring.
Claim 15
Dependent Claim
24 words
The apparatus of claim 12 , wherein the portion of said head portion in contact with said ring is at most a planar circle.
Claim 16
Independent Claim
121 words
A method, comprising the steps of providing a receiver member having an upper aperture, a lower aperture and a hole along a longitudinal axis and extending between said apertures, a channel through said receiver member substantially perpendicular to said hole, and a groove substantially perpendicular to said axis; placing a bone engaging anchor having a head portion and a lower bone engaging portion within said hole such that said bone engaging anchor extends through said lower aperture; placing a substantially planar ring having an inner dimension smaller than said head portion at least partially within said groove such that said head of said bone engaging anchor is retained within said chamber and said ring is substantially unmovable in a radial direction.
Claim 17
Independent Claim
121 words
A method, comprising the steps of providing a receiver member having an upper aperture, a lower aperture and a hole along a longitudinal axis and extending between said apertures, a channel through said receiver member substantially perpendicular to said hole, and a groove substantially perpendicular to said axis; placing a bone engaging anchor having a head portion and a lower bone engaging portion within said hole such that said bone engaging anchor extends through said lower aperture; placing a substantially planar ring having an inner dimension smaller than said head portion at least partially within said groove such that said head of said bone engaging anchor is retained within said chamber and said ring is substantially unmovable in a radial direction.
Claim 18
Dependent Claim
43 words
The method of claim 14 , further comprising the steps of: orienting said receiver member at an angle with respect to said bone engaging anchor; and locking said receiver member and said bone engaging anchor so that said angle between them is maintained.
Claim 19
Dependent Claim
18 words
The method of claim 15 , further comprising the step of inserting a longitudinal element within said channel.
Claim 20
Dependent Claim
25 words
The method of claim 14 , wherein said bone engaging anchor placing step includes inserting said head portion through said lower aperture of said receiver.
Claim 21
Dependent Claim
24 words
The apparatus of claim 10 , wherein said head portion of said bone engaging anchor is adapted to be inserted through said lower aperture.
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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) | 2006-12-08 | 2007-06-09 | 2007-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-12-08 | 2011-06-09 | 2011-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-12-08 | 2015-06-09 | 2015-12-09 | $7700.00 | Window Closed / Lapsed |