US5403136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Threaded fastener especially for orthopaedic purposes
Assignee: Synthes USA LLC
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Filing: 1992-06-24
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Granted: 1995-04-04
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Expires: 2012-06-24
Abstract
Abstract The fastener, which is especially adapted for bones, consists of a shaft (2) bearing a thread (1) with variable pitch, a front end (3) and a rear end (4). The thread (1) is present over the entire area of the shaft (2), and in the area of the rear end (4) is characterized by a smaller pitch than in the area of the front end (3). Thanks to the diminishing pitch of the thread (1) in the proximal direction, a locally differentiated intraosseous pressure generation takes place. In accord with the well-known Wolff's Law, this leads to a controlled bone growth along the loading axis and thus an improvement in the stability of the implanted fastener.
Inventors
- 👤 Robert Mathys
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:33
CPC Classifications
A; A61; A61C; A61C8/00; A61C8/0018; A61C8/0022; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/74; A61B17/742; A61B17/744; A61B17/84; A61B17/86; A61B17/8625; A61B17/863
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
52 words
A fastener comprising a cylindrical shaft having a front end and a rear end and a thread extending over the entire area of the shaft, said thread at said front end being of substantially constant pitch and rearward of said front end diminishing in pitch and in depth toward said rear end.
Claim 2
Dependent Claim
52 words
A fastener comprising a cylindrical shaft having a front end and a rear end and a thread extending over the entire area of the shaft, said thread at said front end being of substantially constant pitch and rearward of said front end diminishing in pitch and in depth toward said rear end.
Claim 3
Dependent Claim
26 words
The fastener according to claim 1 wherein the pitch of the thread diminishes in at least one section by 0.04 to 0.06 mm per thread convolution.
Claim 4
Dependent Claim
27 words
The fastener according to claim 1 wherein the thread, at least in one section has a continuously diminished pitch from the front section to the rear end.
Claim 5
Dependent Claim
11 words
The fastener according to claim 1 wherein the thread is self-tapping.
Claim 6
Dependent Claim
9 words
A dental implant comprising the fastener of claim 1.
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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) | 1998-04-03 | 1998-10-03 | 1999-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-04-03 | 2002-10-03 | 2003-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-04-03 | 2006-10-03 | 2007-04-04 | $7700.00 | Window Closed / Lapsed |