US6306140B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bone screw
Assignee: AO Technology AG
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Filing: 2001-01-17
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Granted: 2001-10-23
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Expires: 2021-01-17
Abstract
Abstract The present invention relates to a implant for providing compression between different regions of material. A first embodiment of the invention relates to a implant configured to substantially prevent separation of compressed regions of material upon removing the implant. In particular, the invention relates to a compression bone screw suitable for stabilizing a fractured bone.
Inventors
- 👤 Imran Tauhid Siddiqui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:30
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/84; A61B17/86; A61B17/8625; A61B17/863
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
120 words
An implant for insertion in a material, the implant comprising: a shaft including a longitudinal axis, a proximal portion, and a distal portion, the proximal and distal portions having proximal and distal threads, respectively; with the proximal and distal threads being configured to threadably engage first and second spaced regions of the material, respectively, when the shaft is rotated in one direction about its longitudinal axis to bias the first and second regions of material with respect to one another to provide compression therebetween, and the proximal thread is configured to substantially inhibit biasing the first region when the shaft is rotated in an opposite direction about its longitudinal axis to substantially prevent tension between the first and second regions.
Claim 2
Dependent Claim
120 words
An implant for insertion in a material, the implant comprising: a shaft including a longitudinal axis, a proximal portion, and a distal portion, the proximal and distal portions having proximal and distal threads, respectively; with the proximal and distal threads being configured to threadably engage first and second spaced regions of the material, respectively, when the shaft is rotated in one direction about its longitudinal axis to bias the first and second regions of material with respect to one another to provide compression therebetween, and the proximal thread is configured to substantially inhibit biasing the first region when the shaft is rotated in an opposite direction about its longitudinal axis to substantially prevent tension between the first and second regions.
Claim 3
Dependent Claim
15 words
The implant of claim 1 , wherein a portion of the proximal thread is tapered.
Claim 4
Dependent Claim
32 words
The implant of claim 2 , wherein the tapered portion of the proximal thread defines an angle of at least about twenty degrees with respect to the longitudinal axis of the shaft.
Claim 5
Dependent Claim
37 words
The implant of claim 2 , wherein the tapered portion of the proximal thread disengages the proximal thread from the first region of material in less than about one-half rotation of the longitudinal axis of the shaft.
Claim 6
Dependent Claim
24 words
The implant of claim 1 , wherein the shaft further comprises a medial portion disposed between and spacing apart the proximal and distal portions.
Claim 7
Dependent Claim
67 words
The implant of claim 1 , wherein the implant is a compression bone screw and the first and second regions of material are first and second regions of bone, respectively, and further wherein, upon insertion, the implant is configured to stabilize the regions of bone by providing compression therebetween and, upon removal of the implant, the implant is configured to inhibit destabilization of the regions of bone.
Claim 8
Dependent Claim
28 words
The implant of claim 1 , wherein the distal portion comprises at least two distal thread starts, the distal threads defining a larger lead than the proximal threads.
Claim 9
Dependent Claim
20 words
The implant of claim 1 , wherein the proximal and distal portions are substantially fixed with respect to one another.
Claim 10
Dependent Claim
26 words
The implant of claim 1 , wherein the proximal portion includes a proximal face, the proximal face including a depressed region defining a drive mechanism therein.
Claim 11
Dependent Claim
46 words
The implant of claim 1 , wherein the distal threads define a proximal face and a distal face, the proximal face defining a first angle with respect to the longitudinal axis and the distal face defining a second, smaller angle with respect to the longitudinal axis.
Claim 12
Dependent Claim
100 words
An implant for insertion in a material having first and second regions, the implant comprising: a proximal portion having at least one thread start, the proximal thread configured to be accommodated within the first region of material; a distal portion having at least three thread starts, the distal threads configured to be accommodated within the second region of material; and wherein, upon insertion of the implant by rotation, the proximal and distal threads threadably engage the first and second regions, respectively, to provide compression therebetween, the distal threads providing sufficient purchase to substantially prevent damaging the second region of material.
Claim 13
Dependent Claim
100 words
An implant for insertion in a material having first and second regions, the implant comprising: a proximal portion having at least one thread start, the proximal thread configured to be accommodated within the first region of material; a distal portion having at least three thread starts, the distal threads configured to be accommodated within the second region of material; and wherein, upon insertion of the implant by rotation, the proximal and distal threads threadably engage the first and second regions, respectively, to provide compression therebetween, the distal threads providing sufficient purchase to substantially prevent damaging the second region of material.
Claim 14
Dependent Claim
16 words
The implant of claim 11 , wherein the proximal portion includes at least two thread starts.
Claim 15
Dependent Claim
16 words
The implant of claim 12 , wherein the proximal portion includes at least three thread starts.
Claim 16
Dependent Claim
16 words
The implant of claim 13 , wherein the distal portion includes at least four thread starts.
Claim 17
Dependent Claim
55 words
The implant of claim 11 , wherein the implant defines a longitudinal axis and further wherein the distal threads define a proximal face and a distal face, the proximal face defining a first angle with respect to the longitudinal axis and the distal face defining a second, smaller angle with respect to the longitudinal axis.
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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) | 2004-10-22 | 2005-04-23 | 2005-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-10-22 | 2009-04-23 | 2009-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-10-22 | 2013-04-23 | 2013-10-23 | $7700.00 | Window Closed / Lapsed |