Patent US6296642B1 successfully refreshed from Google Patents.
US6296642B1
Expired / Lapsed
US
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Reverse angle thread for preventing splaying in medical devices
Assignee: Warsaw Orthopedic Inc
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Filing: 1998-11-09
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Granted: 2001-10-02
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Expires: 2018-11-09
Abstract
Abstract Apparatus is disclosed for use in closing a medical device and preventing splaying of wall portions or legs of the medical device while maintaining low profile and minimal bulk of the medical device. The disclosed device is a medical device including a receiver member and a closure member. The receiver member includes an internal reverse angle thread, and the closure member includes an outer reverse angle thread, matable with the inner reverse angle thread. When the closure member is threaded into the receiver member, forces tending to splaying the wall portions or legs of the receiver member cause an interference fit between thread surfaces of the closure member and the receiver member, preventing the splay from occurring.
Inventors
- 👤 Matthew M. Morrison
- 👤 Craig Squires
- 👤 B. Thomas Barker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:06
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/70; A61B17/7001; A61B17/7035; A61B17/7037; A61B17/7032; A61B90/00; A61B90/03; A61B2090/037
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
76 words
A medical device, comprising: a receiver member including a plurality of wall sections defining a longitudinal bore in said medical device, said receiver member also including a transverse channel substantially perpendicular to said bore; and a closure member including a substantially cylindrical engagement portion having a longitudinal axis, and a reverse angle thread formed on said engagement portion so that said engagement portion is adapted to be threadedly engaged within said bore to said wall sections.
Claim 2
Dependent Claim
76 words
A medical device, comprising: a receiver member including a plurality of wall sections defining a longitudinal bore in said medical device, said receiver member also including a transverse channel substantially perpendicular to said bore; and a closure member including a substantially cylindrical engagement portion having a longitudinal axis, and a reverse angle thread formed on said engagement portion so that said engagement portion is adapted to be threadedly engaged within said bore to said wall sections.
Claim 3
Dependent Claim
65 words
The medical device of claim 1 , wherein said wall sections include an inner reverse angle thread corresponding to said reverse angle thread of said engagement portion of said closure member, whereby said reverse angle thread of said wall sections and said reverse angle thread of said engagement portion are engaged when said engagement portion is threadedly engaged within said bore to said wall sections.
Claim 4
Dependent Claim
19 words
The medical device of claim 1 , wherein said receiver member is a part of a bone fixation device.
Claim 5
Dependent Claim
16 words
The medical device of claim 3 , wherein said bone fixation device is a bone screw.
Claim 6
Dependent Claim
17 words
The medical device of claim 4 , wherein said bone fixation device is a multi-axial bone screw.
Claim 7
Dependent Claim
16 words
The medical device of claim 3 , wherein said bone fixation device is a spinal hook.
Claim 8
Dependent Claim
42 words
The medical device of claim 3 , wherein said reverse angle thread includes a rearward thread surface, wherein an angle measured from a plane normal with said longitudinal axis to said rearward thread surface is between about −1 degrees and −40 degrees.
Claim 9
Dependent Claim
14 words
The medical device of claim 7 , wherein said angle is about −5 degrees.
Claim 10
Dependent Claim
15 words
The medical device of claim 1 , wherein said closure member is a set screw.
Claim 11
Dependent Claim
15 words
The medical device of claim 1 , wherein said closure member is a break-off screw.
Claim 12
Independent Claim
92 words
An apparatus for connecting an elongated member and a bone, comprising: a receiver member having an inner-threaded longitudinal bore, a channel communicating with and substantially perpendicular to said longitudinal bore for accommodating the elongated member and a fixation portion for fixing said receiver member to the bone; and a closure member having a longitudinal axis and an outer threaded portion for threaded engagement with said threaded portion of said receiver member, wherein said threaded portion of said receiver member and said threaded portion of said closure member include a reverse angle thread.
Claim 13
Independent Claim
92 words
An apparatus for connecting an elongated member and a bone, comprising: a receiver member having an inner-threaded longitudinal bore, a channel communicating with and substantially perpendicular to said longitudinal bore for accommodating the elongated member and a fixation portion for fixing said receiver member to the bone; and a closure member having a longitudinal axis and an outer threaded portion for threaded engagement with said threaded portion of said receiver member, wherein said threaded portion of said receiver member and said threaded portion of said closure member include a reverse angle thread.
Claim 14
Dependent Claim
97 words
The apparatus of claim 11 , wherein said reverse angle thread of said closure member includes a rearward thread surface such that an angle measured from a plane normal with said longitudinal axis to said rearward thread surface of said closure member is between about −1 degrees and −40 degrees, and said reverse angle thread of said receiver member includes a rearward thread surface such that an angle measured from a plane normal with an axis of said longitudinal bore to said rearward thread surface of said receiver member is between about −1 degrees and −40 degrees.
Claim 15
Dependent Claim
13 words
The apparatus of claim 12 wherein said closure member is a set screw.
Claim 16
Dependent Claim
14 words
The apparatus of claim 12 wherein said closure member is a break-off head screw.
Claim 17
Dependent Claim
15 words
The apparatus of claim 11 wherein said fixation portion is integral with said receiver member.
Claim 18
Dependent Claim
13 words
The apparatus of claim 15 wherein said fixation portion includes a threaded portion.
Claim 19
Dependent Claim
13 words
The apparatus of claim 15 wherein said fixation portion includes a hook portion.
Claim 20
Dependent Claim
56 words
The apparatus of claim 11 wherein said bore of said receiver member extends through said receiver member, and said fixation portion is a bone fixation device which is accommodated within at least a portion of said bore and is adaptable to be fixed to the bone at any of a plurality of angles to said bore.
Claim 21
Dependent Claim
14 words
The apparatus of claim 18 wherein said bone fixation device is a bone screw.
Claim 22
Dependent Claim
13 words
The apparatus of claim 18 wherein said bone fixation device is a hook.
Claim 23
Dependent Claim
73 words
A medical device, comprising: a receiver member including a plurality of wall sections separated by a slot, said wall sections at least partially defining a longitudinal bore in said medical device; and a closure member including a substantially cylindrical engagement portion having a longitudinal axis, and a reverse angle thread formed on said engagement portion so that said engagement portion is adapted to be threadedly engaged within said bore to said wall sections.
Claim 24
Dependent Claim
73 words
A medical device, comprising: a receiver member including a plurality of wall sections separated by a slot, said wall sections at least partially defining a longitudinal bore in said medical device; and a closure member including a substantially cylindrical engagement portion having a longitudinal axis, and a reverse angle thread formed on said engagement portion so that said engagement portion is adapted to be threadedly engaged within said bore to said wall sections.
Claim 25
Dependent Claim
65 words
The medical device of claim 21 , wherein said wall sections include an inner reverse angle thread corresponding to said reverse angle thread of said engagement portion of said closure member, whereby said reverse angle thread of said wall sections and said reverse angle thread of said engagement portion are engaged when said engagement portion is threadedly engaged within said bore to said wall sections.
Claim 26
Dependent Claim
25 words
The medical device of claim 21 , wherein said receiver member includes a transverse channel substantially perpendicular to said longitudinal bore of said receiver member.
Claim 27
Dependent Claim
19 words
The medical device of claim 21 , wherein said receiver member is a part of a bone fixation device.
Claim 28
Dependent Claim
16 words
The medical device of claim 24 , wherein said bone fixation device is a bone screw.
Claim 29
Dependent Claim
17 words
The medical device of claim 25 , wherein said bone fixation device is a multi-axial bone screw.
Claim 30
Dependent Claim
16 words
The medical device of claim 24 , wherein said bone fixation device is a spinal hook.
Claim 31
Dependent Claim
42 words
The medical device of claim 24 , wherein said reverse angle thread includes a rearward thread surface, wherein an angle measured from a plane normal with said longitudinal axis to said rearward thread surface is between about −1 degrees and −40 degrees.
Claim 32
Dependent Claim
14 words
The medical device of claim 28 , wherein said angle is about −5 degrees.
Claim 33
Dependent Claim
15 words
The medical device of claim 21 , wherein said closure member is a set screw.
Claim 34
Dependent Claim
15 words
The medical device of claim 21 , wherein said closure member is a break-off screw.
Claim 35
Dependent Claim
16 words
The medical device of claim 21 , wherein a plurality of slots separate said wall sections.
Claim 36
Dependent Claim
22 words
The medical device of claim 32 , wherein said plurality of slots form at least one channel transverse to said longitudinal bore.
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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) | 2004-10-01 | 2005-04-02 | 2005-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-10-01 | 2009-04-02 | 2009-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-10-01 | 2013-04-02 | 2013-10-02 | $7700.00 | Window Closed / Lapsed |