US5019079A
Expired / Lapsed
US
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Bone screw
Assignee: Zimmer Technology Inc
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Filing: 1989-11-20
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Granted: 1991-05-28
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Expires: 2009-11-20
Abstract
Abstract A guided bone screw includes proximal and distal sections threaded with different pitches in the same direction and spaced by an unthreaded intermediate section having a shorter length than the distal section with a diameter substantially equal to the major diameter of the distal section. The intermediate section diameter is greater than the minor diameter and smaller than the major diameter of the proximal section thread. The threads of both the distal and proximal sections are self-tapping. A guide bore for a guide wire extends the entire length of the screw. Two drive recesses are disposed in the proximal screw end on opposite sides of the guide bore for engagement by a two-pin screwdriver. The unthreaded intermediate section radially fills the bone bore in which it is implanted to provide lateral stability for the bone screw.
Inventors
- 👤 Randall D. Ross
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:33
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/84; A61B17/86; A61B17/8625; A61B17/863; F; F16; F16B; F16B23/00; F16B23/0069; F16B35/00; F16B35/04; F16B35/041; A61B17/864; F16B25/00
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
105 words
A bone screw connecting two pieces of bone comprising: a distal end; a proximal end; a generally cylindrical unthreaded intermediate section having a predetermined diameter; a threaded proximal section extending from said proximal end to said intermediate section and having a first uniformly-pitched thread; a threaded distal section extending from said distal end to said intermediate section and having a second uniformly-pitched thread that is threaded in the same direction as said first threads; wherein the pitch of said second thread is greater than the pitch of said first thread; and wherein said second thread has a major diameter substantially equal to said predetermined diameter.
Claim 2
Dependent Claim
105 words
A bone screw connecting two pieces of bone comprising: a distal end; a proximal end; a generally cylindrical unthreaded intermediate section having a predetermined diameter; a threaded proximal section extending from said proximal end to said intermediate section and having a first uniformly-pitched thread; a threaded distal section extending from said distal end to said intermediate section and having a second uniformly-pitched thread that is threaded in the same direction as said first threads; wherein the pitch of said second thread is greater than the pitch of said first thread; and wherein said second thread has a major diameter substantially equal to said predetermined diameter.
Claim 3
Dependent Claim
29 words
The bone screw according claim 1 wherein said first thread is self-tapping at its end adjacent said intermediate section, and wherein second thread is self-tapping at said distal end.
Claim 4
Dependent Claim
29 words
The bone screw according to claim 1 wherein said first thread has a major diameter larger than said predetermined diameter and a minor diameter smaller than said predetermined diameter.
Claim 5
Dependent Claim
18 words
The bone screw according to claim 1 wherein said distal section is axially longer than said intermediate section.
Claim 6
Dependent Claim
55 words
The bone screw according to claim 1 further comprising a central longitudinal guide bore extending the entire length of said bone screw between said distal and proximal ends, and wherein said proximal end has two longitudinal recesses defined therein on diametrically opposite sides of said guide bore for receiving respective drive pins of a screwdriver.
Claim 7
Dependent Claim
60 words
The bone screw according to claim 1 wherein said first and second thread each have a compressive force-applying surface facing said intermediate section and an opposite surface, said compressive force-applying surface defining a first angle within approximately 5° of perpendicular to the length dimension of said screw, said opposite surface defining a significantly greater second angle with said length dimension.
Claim 8
Dependent Claim
43 words
The bone screw according to claim 1 wherein said first thread is self-tapping at its end adjacent said intermediate section, and wherein said second thread is self-tapping at said distal end; and wherein said distal section is axially longer than said intermediate section.
Claim 9
Dependent Claim
44 words
The bone screw according to claim 1 wherein said first thread has a major diameter larger than said predetermined diameter and a minor diameter smaller than said predetermined diameter; and wherein said second thread has a major diameter substantially equal to said predetermined diameter.
Claim 10
Dependent Claim
104 words
A bone screw for connecting two pieces of bone comprising; a distal end; a proximal end; a generally cylindrical unthreaded intermediate section having a predetermined diameter; a threaded proximal section extending from said proximal end to said intermediate section and having a first uniformly-pitched thread; a threaded distal section extending from said distal end to said intermediate section and having a second uniformly-pitched thread that is threaded in the same direction as said first thread; wherein the pitch of said second thread is greater than the pitch of said first thread; and wherein said threaded distal section is axially longer than said intermediate section.
Claim 11
Dependent Claim
104 words
A bone screw for connecting two pieces of bone comprising; a distal end; a proximal end; a generally cylindrical unthreaded intermediate section having a predetermined diameter; a threaded proximal section extending from said proximal end to said intermediate section and having a first uniformly-pitched thread; a threaded distal section extending from said distal end to said intermediate section and having a second uniformly-pitched thread that is threaded in the same direction as said first thread; wherein the pitch of said second thread is greater than the pitch of said first thread; and wherein said threaded distal section is axially longer than said intermediate section.
Claim 12
Dependent Claim
31 words
The bone screw according to claim 9 wherein said first thread is self-tapping at its end adjacent said intermediate section, and wherein said second thread is self-tapping at said distal end.
Claim 13
Dependent Claim
29 words
The bone screw according to claim 9 wherein said first thread has a major diameter larger than said predetermined diameter and a minor diameter smaller than said predetermined diameter.
Claim 14
Dependent Claim
21 words
The bone screw according to claim 9 wherein said second thread has a major diameter substantially equal to said predetermined diameter.
Claim 15
Dependent Claim
45 words
The bone screw according to claim 9 wherein said second thread has a major diameter substantially equal to said predetermined diameter; and wherein said first thread is self-tapping at its end adjacent said intermediate section, and said second thread is self-tapping at said distal end.
Claim 16
Dependent Claim
55 words
The bone screw according to claim 9 further comprising a central longitudinal guide bore extending the entire length of said bone screw between said distal and proximal ends, and wherein said proximal end has two longitudinal recesses defined therein on diametrically opposite sides of said guide bore for receiving respective drive pin of a screwdriver.
Claim 17
Dependent Claim
137 words
A bone screw for connecting two pieces of bone comprising: a distal end; a proximal end; a generally cylindrical unthreaded intermediate section having a predetermined diameter; a threaded proximal section extending from said proximal end to said intermediate section and having a first uniformly-pitched thread; a threaded distal section extending from said distal end to said intermediate section and having a second uniformly-pitched thread that is threaded in the same direction as said first thread; wherein the pitch of said second thread is greater than the pitch of said first thread; wherein said first thread is self-tapping at its end adjacent said intermediate section and said second thread is self-tapping at said distal end; and wherein said first thread has a major diameter larger than said predetermined diameter and a minor diameter smaller than said predetermined diameter.
Claim 18
Dependent Claim
137 words
A bone screw for connecting two pieces of bone comprising: a distal end; a proximal end; a generally cylindrical unthreaded intermediate section having a predetermined diameter; a threaded proximal section extending from said proximal end to said intermediate section and having a first uniformly-pitched thread; a threaded distal section extending from said distal end to said intermediate section and having a second uniformly-pitched thread that is threaded in the same direction as said first thread; wherein the pitch of said second thread is greater than the pitch of said first thread; wherein said first thread is self-tapping at its end adjacent said intermediate section and said second thread is self-tapping at said distal end; and wherein said first thread has a major diameter larger than said predetermined diameter and a minor diameter smaller than said predetermined diameter.
Claim 19
Dependent Claim
20 words
The bone screw according to claim 15 wherein said second thread has a major diameter substantially equal to predetermined diameter.
Claim 20
Dependent Claim
18 words
The bone screw according to claim 15 wherein said distal section is axially longer than said intermediate section.
Claim 21
Dependent Claim
24 words
The bone screw according to claim 15 wherein the major diameter of said first thread is the largest lateral dimension of said bone screw.
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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) | 1994-05-27 | 1994-11-26 | 1995-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-27 | 1998-11-26 | 1999-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-27 | 2002-11-26 | 2003-05-28 | $7700.00 | Window Closed / Lapsed |