US5536127A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Headed screw construction for use in fixing the position of an intramedullary nail
Assignee: Individual
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Filing: 1995-02-22
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Granted: 1996-07-16
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Expires: 2015-02-22
Abstract
Abstract The invention relates to a headed screw for fixing an intramedullary nail in position. An external thread on the screw shank is provided over all, or a part of spaced parts, of the length of the shank. The screw head is provided with an external thread having a direction of helical advance which is opposite the direction of helical advance of the screw-shank thread.
Inventors
- 👤 Dietmar Pennig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:05
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/84; A61B17/86; A61B17/8625; A61B17/863; A61B17/72
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
88 words
A headed screw with a bone-engaging screw thread, comprising an elongate shank having an external thread for bone-engaged anchorage of said screw, and a drive head at one end of said shank, wherein: (a) the drive head (2) has an external thread (5) having a direction of thread advance which is opposite to the direction of shank-thread advance; (b) the shank thread is at least at the opposite end of said shank; and (c) the maximum diameter of the shank thread is the maximum diameter of the shank.
Claim 2
Dependent Claim
88 words
A headed screw with a bone-engaging screw thread, comprising an elongate shank having an external thread for bone-engaged anchorage of said screw, and a drive head at one end of said shank, wherein: (a) the drive head (2) has an external thread (5) having a direction of thread advance which is opposite to the direction of shank-thread advance; (b) the shank thread is at least at the opposite end of said shank; and (c) the maximum diameter of the shank thread is the maximum diameter of the shank.
Claim 3
Dependent Claim
34 words
The headed screw of claim 1, wherein the shank thread at the said opposite end is limited to only a portion of the length of said shank, the remainder of the shank being cylindrical.
Claim 4
Dependent Claim
19 words
The headed screw of claim 1, wherein the shank thread extends over substantially the entire length of the shank.
Claim 5
Dependent Claim
101 words
A headed screw with a bone-engaging screw thread, comprising an elongate shank having an external thread for bone-engaged anchorage of said screw, and a drive head at one end of said shank, wherein: (a) the drive head (2) has an external thread (5) having a direction of thread advance which is opposite to the direction of shank-thread advance; (b) the shank thread is at least at the opposite end of said shank and is limited to only a portion of the length of said shank; and (c) a second threaded portion of said shank is additionally provided near said one end.
Claim 6
Dependent Claim
101 words
A headed screw with a bone-engaging screw thread, comprising an elongate shank having an external thread for bone-engaged anchorage of said screw, and a drive head at one end of said shank, wherein: (a) the drive head (2) has an external thread (5) having a direction of thread advance which is opposite to the direction of shank-thread advance; (b) the shank thread is at least at the opposite end of said shank and is limited to only a portion of the length of said shank; and (c) a second threaded portion of said shank is additionally provided near said one end.
Claim 7
Dependent Claim
23 words
The headed screw of claim 3, wherein said shank is cylindrical over an intermediate portion, between the respective threaded ends of said shank.
Claim 8
Dependent Claim
107 words
A headed screw with a bone-engaging screw thread, comprising an elongate shank having an external thread for bone-engaged anchorage of said screw, and a drive head at one end of said shank, wherein: (a) the drive head (2) has an external thread (5) having a direction of thread advance which is opposite to the direction of shank-thread advance; (b) the shank thread is at least at the opposite end of said shank; (c) a portion of shank is cylindrical; and (d) the thread at the opposite end of said shank has a maximum diameter that is at least no greater than the diameter of said cylindrical portion.
Claim 9
Dependent Claim
107 words
A headed screw with a bone-engaging screw thread, comprising an elongate shank having an external thread for bone-engaged anchorage of said screw, and a drive head at one end of said shank, wherein: (a) the drive head (2) has an external thread (5) having a direction of thread advance which is opposite to the direction of shank-thread advance; (b) the shank thread is at least at the opposite end of said shank; (c) a portion of shank is cylindrical; and (d) the thread at the opposite end of said shank has a maximum diameter that is at least no greater than the diameter of said cylindrical portion.
Claim 10
Dependent Claim
40 words
The headed screw of claim 6, wherein a second threaded portion is additionally provided, between said cylindrical portion and said head, the threads of said second threaded portion being of greater outside diameter than the diameter of said cylindrical portion.
Claim 11
Dependent Claim
61 words
The headed screw of claim 6, wherein a second threaded portion is additionally provided, between said cylindrical portion and said head, the threads of said second threaded portion being of greater outside diameter than the diameter of said cylindrical portion, and the threads of said first threaded portion and of said second threaded portion having the same axial advance per turn.
Claim 12
Dependent Claim
98 words
A headed screw with a bone-engaging screw thread, comprising an elongate shank having an external thread for bone-engaged anchorage of said screw, and a drive head at one end of said shank, wherein: (a) the drive head (2) has an external thread (5) having a direction of thread advance which is opposite to the direction of shank-thread advance; (b) the shank thread is only at the opposite end of said shank; (c) the remainder of said shank is cylindrical, and (d) the maximum diameter of the shank thread is no greater than the diameter of said cylindrical remainder.
Claim 13
Dependent Claim
98 words
A headed screw with a bone-engaging screw thread, comprising an elongate shank having an external thread for bone-engaged anchorage of said screw, and a drive head at one end of said shank, wherein: (a) the drive head (2) has an external thread (5) having a direction of thread advance which is opposite to the direction of shank-thread advance; (b) the shank thread is only at the opposite end of said shank; (c) the remainder of said shank is cylindrical, and (d) the maximum diameter of the shank thread is no greater than the diameter of said cylindrical remainder.
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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) | 1999-07-16 | 2000-01-15 | 2000-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-07-16 | 2004-01-15 | 2004-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-07-16 | 2008-01-15 | 2008-07-16 | $7700.00 | Window Closed / Lapsed |