US5383878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surgical screw
Assignee: Hip Developments Pty Ltd
•
Filing: 1991-08-30
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Granted: 1995-01-24
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Expires: 2011-08-30
Abstract
Abstract A surgical screw has a head being, at least in a portion, hemispherical. A smooth continuous join exists between the head and a shank of the screw, the head being of the same, or larger, diameter as the shank. To drive the screw a drive socket is provided concentrically within the head, and a cannulation is provided concentrically of the shank and it opens into the socket so as to allow the screw to be threaded along a guide wire or similar. The shank has a smooth or soft thread so as to provide an interlocking fixation of a bone end of a tendon graft within a prepared hole of a bone, but without damaging either bone structures. The hemispherical portion provides a smooth continuous curved surface over which a graft may flex and move without fatigue or suffering stress concentrations.
Inventors
- 👤 Gregory J. Roger
- 👤 Leo A. Pinczewski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:54
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/08; A61F2/0811; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/84; A61B17/86; A61B17/8645; A61F2002/0817; A61F2002/0841; A61F2002/0847; A61F2002/0858; A61F2002/087; A61F2002/0876; A61F2002/0888
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
97 words
A surgical screw having a shank with a longitudinal axis, a thread extending along a length of the shank from one end of the shank, the thread being devoid of an outer cutting line throughout said length, a head at tan opposite end of the shank, said head having an outer surface extending smoothly and continuously from an adjacent part of the shank, said outer surface including a hemispherical end portion having a diameter at least equal to a maximum diameter of said part of the shank, and a recess in the head for an insertion tool.
Claim 2
Dependent Claim
97 words
A surgical screw having a shank with a longitudinal axis, a thread extending along a length of the shank from one end of the shank, the thread being devoid of an outer cutting line throughout said length, a head at tan opposite end of the shank, said head having an outer surface extending smoothly and continuously from an adjacent part of the shank, said outer surface including a hemispherical end portion having a diameter at least equal to a maximum diameter of said part of the shank, and a recess in the head for an insertion tool.
Claim 3
Dependent Claim
35 words
A surgical screw as claimed in claim 1, wherein said part of the shank is unthreaded and wherein the diameter of said surface is equal to the maximum diameter of said part of the shank.
Claim 4
Dependent Claim
39 words
A surgical screw as claimed in claim 1, wherein the diameter of said surface is greater than the maximum diameter of said part of the shank and said surface tapers down to the shank through a frusto-conical transition zone.
Claim 5
Dependent Claim
27 words
A surgical screw as claimed in claim 1, wherein the thread is substantially sinusoidal as viewed in a plane passing through the longitudinal axis of the shank.
Claim 6
Dependent Claim
24 words
A surgical screw as claimed in claim 1, which includes a canulation extending along the longitudinal axis of the shank and through said recess.
Claim 7
Dependent Claim
19 words
A surgical screw as claimed in claim 1, in which said surface has a diameter of about 4 mm.
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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) | 1998-01-23 | 1998-07-25 | 1999-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-01-23 | 2002-07-25 | 2003-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-01-23 | 2006-07-25 | 2007-01-24 | $7700.00 | Window Closed / Lapsed |