US6083227A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bone screw and method for manufacturing said screw
Assignee: Societe de Fabrication de Material Orthopedique en Abrege SOFAMOR SNC
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Filing: 1998-09-21
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Granted: 2000-07-04
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Expires: 2018-09-21
Abstract
Abstract Bone screw for osteosynthesis devices comprising a screwing head and a screw-threaded shank having a transition portion having a variable profile between two shank parts of different profiles. The threading has a constant pitch and a constant outside diameter, and includes cutting crests throughout its length, including in the transition region. According to one method for manufacturing this screw, there are machined on the transition portion of the shank threads of decreasing depth up to the end of this transition region, the threads along the transition portion defining truncated, non-cutting crests. There is removed from the threads on the transition portion a sufficient amount of material for converting the non-cutting crests into sharp, cutting crests. This method provides a screw with bone anchorage capability throughout the length of the thread.
Inventors
- 👤 Jean Saurat
- 👤 Stephane Bette
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:09
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/84; A61B17/86; A61B17/8625; A61B17/863; A61B17/70; A61B17/7001; A61B17/7032
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
112 words
A bone screw, comprising: a head portion; a shank defining a length, said shank extending from said head portion and including: an end portion opposite said head portion having a generally cylindrical profile; a transition portion between said end portion and said head portion having a variable profile; and a thread extending along said length having a generally constant pitch and a generally constant diameter along said length, said thread having a depth that is generally constant along said end portion and progressively decreases along said transition portion in a direction from said end portion toward said head portion, and has an end closest to said head portion with a cutting crest.
Claim 2
Dependent Claim
112 words
A bone screw, comprising: a head portion; a shank defining a length, said shank extending from said head portion and including: an end portion opposite said head portion having a generally cylindrical profile; a transition portion between said end portion and said head portion having a variable profile; and a thread extending along said length having a generally constant pitch and a generally constant diameter along said length, said thread having a depth that is generally constant along said end portion and progressively decreases along said transition portion in a direction from said end portion toward said head portion, and has an end closest to said head portion with a cutting crest.
Claim 3
Dependent Claim
23 words
The bone screw of claim 1, wherein said shank includes a generally smooth, unthreaded portion between said head portion and said transition portion.
Claim 4
Dependent Claim
15 words
The bone screw of claim 1, wherein said generally variable profile defines a frusto-conical shape.
Claim 5
Dependent Claim
39 words
The bone screw of claim 1, wherein said cutting crest defines an edge for engaging bone, and said edge terminates in an apical point on a cross section of said shank taken parallel to the length of said shank.
Claim 6
Dependent Claim
18 words
The bone screw of claim 1, wherein said cutting crest extends along the entire length of said thread.
Claim 7
Dependent Claim
17 words
The bone screw of claim 1, wherein said head has a generally U-shaped profile defining a slot.
Claim 8
Independent Claim
85 words
A method for manufacturing a bone screw, comprising the steps of: (a) providing a blank having a shank extending from a head, the shank having a length with a generally constant diameter; (b) forming a thread along the length of the shank, the thread defining a cutting crest portion and a truncated crest portion, the thread having a generally constant pitch along the length; and (c) converting the truncated crest portion to another cutting crest portion by removing flank material from the truncated crest portion.
Claim 9
Independent Claim
85 words
A method for manufacturing a bone screw, comprising the steps of: (a) providing a blank having a shank extending from a head, the shank having a length with a generally constant diameter; (b) forming a thread along the length of the shank, the thread defining a cutting crest portion and a truncated crest portion, the thread having a generally constant pitch along the length; and (c) converting the truncated crest portion to another cutting crest portion by removing flank material from the truncated crest portion.
Claim 10
Dependent Claim
38 words
The method according to claim 7, wherein the thread made according to step (b) includes a first portion with a generally constant depth and a second portion with a progressively decreasing depth in a direction toward said head.
Claim 11
Dependent Claim
20 words
The method according to claim 7, wherein the forming step and the converting step are performed by a milling cutter.
Claim 12
Dependent Claim
38 words
The method according to claim 9, further comprising gradually withdrawing the milling cutter to define a transitional portion, the thread having a progressively decreasing depth along the transitional portion in a direction toward the head along the shank.
Claim 13
Dependent Claim
27 words
The method according to claim 7, wherein the converting step includes removing the flank material from a front side of the thread of the truncated crest portion.
Claim 14
Dependent Claim
31 words
The method according to claim 7, wherein the converting step includes removing a flank material from a front side and a rear side of the thread of the truncated crest portion.
Claim 15
Dependent Claim
15 words
The method of claim 7, wherein the forming step includes milling, rolling, grinding, or molding.
Claim 16
Dependent Claim
86 words
The method of claim 7, wherein the bone screw provided by the converting step includes: an end portion opposite the head, the end portion having a generally cylindrical profile, the thread having a generally constant depth along said end portion; a transition portion between the end portion and the head portion, the transition portion having a generally frusto-conical profile, the thread having a progressively decreasing depth in a direction from the end portion toward the head; and further wherein the thread has a generally constant diameter.
Claim 17
Dependent Claim
16 words
The method of claim 7, wherein the head has a generally U-shaped profile defining a slot.
Claim 18
Dependent Claim
100 words
A bone screw, comprising: a head portion having a generally U-shaped profile defining a slot; a shank defining a length, said shank extending from said head portion and including: an end portion opposite said head portion having a generally cylindrical profile; a transition portion between said end portion and said head portion having a variable profile; and a thread having a depth that is generally constant along said end portion and progressively decreases along said transition portion in a direction from said end portion toward said head portion, and has an end closest to said head with a cutting crest.
Claim 19
Dependent Claim
100 words
A bone screw, comprising: a head portion having a generally U-shaped profile defining a slot; a shank defining a length, said shank extending from said head portion and including: an end portion opposite said head portion having a generally cylindrical profile; a transition portion between said end portion and said head portion having a variable profile; and a thread having a depth that is generally constant along said end portion and progressively decreases along said transition portion in a direction from said end portion toward said head portion, and has an end closest to said head with a cutting crest.
Claim 20
Dependent Claim
23 words
The bone screw of claim 16, wherein said shank includes a generally smooth, unthreaded portion between said head portion and said transition portion.
Claim 21
Dependent Claim
15 words
The bone screw of claim 16, wherein said generally variable profile defines a frusto-conical shape.
Claim 22
Dependent Claim
35 words
The bone screw of claim 16, wherein said thread extends along said length with a generally constant pitch and a generally constant diameter, and said cutting crest extends along the entire length of said thread.
Claim 23
Dependent Claim
14 words
The bone screw of claim 16, wherein said cutting crest terminates an apical edge.
Claim 24
Dependent Claim
109 words
A bone screw, comprising: a head portion; a shank defining a length, said shank extending from said head portion and including: an end portion opposite said head portion having a generally cylindrical profile; a transition portion between said end portion and said head portion having a variable profile; a thread having a depth that is generally constant along said end portion and progressively decreases along said transition portion in a direction from said end portion toward said head portion, and has an end closest to said head with a cutting crest; and wherein said shank includes a generally smooth, unthreaded portion between said head portion and said transition portion.
Claim 25
Dependent Claim
109 words
A bone screw, comprising: a head portion; a shank defining a length, said shank extending from said head portion and including: an end portion opposite said head portion having a generally cylindrical profile; a transition portion between said end portion and said head portion having a variable profile; a thread having a depth that is generally constant along said end portion and progressively decreases along said transition portion in a direction from said end portion toward said head portion, and has an end closest to said head with a cutting crest; and wherein said shank includes a generally smooth, unthreaded portion between said head portion and said transition portion.
Claim 26
Dependent Claim
15 words
The bone screw of claim 21, wherein said generally variable profile defines a frusto-conical shape.
Claim 27
Dependent Claim
17 words
The bone screw of claim 21, wherein said cutting crest defines an apical edge for engaging bone.
Claim 28
Dependent Claim
23 words
The bone screw of claim 21, wherein said thread extends along said length with a generally constant pitch and a generally constant diameter.
Claim 29
Dependent Claim
17 words
The bone screw of claim 21, wherein said head has a generally U-shaped profile defining a slot.
Claim 30
Dependent Claim
125 words
A bone screw, comprising: a head portion; a shank defining a length, said shank extending from said head portion and including: an end portion opposite said head portion having a generally cylindrical profile; a transition portion between said end portion and said head portion having a variable profile; a thread having a depth that is generally constant along said end portion and progressively decreases along said transition portion in a direction from said end portion toward said head portion, and has an end closest to said head with a cutting crest; and wherein said cutting crest defines an edge for engaging bone, and said edge terminates in an apical point on a cross section of said shank taken parallel to the length of said shank.
Claim 31
Dependent Claim
125 words
A bone screw, comprising: a head portion; a shank defining a length, said shank extending from said head portion and including: an end portion opposite said head portion having a generally cylindrical profile; a transition portion between said end portion and said head portion having a variable profile; a thread having a depth that is generally constant along said end portion and progressively decreases along said transition portion in a direction from said end portion toward said head portion, and has an end closest to said head with a cutting crest; and wherein said cutting crest defines an edge for engaging bone, and said edge terminates in an apical point on a cross section of said shank taken parallel to the length of said shank.
Claim 32
Dependent Claim
23 words
The bone screw of claim 26, wherein said shank includes a generally smooth, unthreaded portion between said head portion and said transition portion.
Claim 33
Dependent Claim
15 words
The bone screw of claim 26, wherein said generally variable profile defines a frusto-conical shape.
Claim 34
Dependent Claim
35 words
The bone screw of claim 26, wherein said thread extends along said length with a generally constant pitch and a generally constant diameter, and said cutting crest extends along the entire length of said thread.
Claim 35
Dependent Claim
15 words
The bone screw of claim 26, wherein said cutting crest terminates in an apical edge.
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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) | 2003-07-04 | 2004-01-03 | 2004-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-07-04 | 2008-01-03 | 2008-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-07-04 | 2012-01-03 | 2012-07-04 | $7700.00 | Window Closed / Lapsed |