US6454772B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Set screw for medical implant with gripping side slots
Assignee: Individual
•
Filing: 2000-12-08
•
Granted: 2002-09-24
•
Expires: 2020-12-08
Abstract
Abstract A set screw for locking a first implant in position relative to a second implant. The set screw having a bore with at least one side slot extending parallel to the axis of the screw and intersecting with an underside of the screw to produce an edge at such intersection. Preferably the slots also intersect with an upper surface of the bore to provide purchase for removal or insertion.
Inventors
- 👤 Roger P. Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:27
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/70; A61B17/7001; A61B17/7032; A61B17/7074; A61B17/7091; A61B90/00; A61B90/03; A61B2090/037
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
47 words
A set screw comprising a) A base having an axis of rotation and a radially outward generally cylindrical threaded surface, a top surface and a bottom surface; and b) said base having a slot extending radially inward from said threaded surface and intersecting with said bottom surface.
Claim 2
Dependent Claim
47 words
A set screw comprising a) A base having an axis of rotation and a radially outward generally cylindrical threaded surface, a top surface and a bottom surface; and b) said base having a slot extending radially inward from said threaded surface and intersecting with said bottom surface.
Claim 3
Dependent Claim
20 words
The set screw according to claim 1 wherein: a) said slot extends between the base top surface and bottom surface.
Claim 4
Dependent Claim
37 words
The set screw according to claim 1 wherein: a) said slot is a first slot; and including: b) a second slot intersecting with said base top surface; said first and second slots not intersecting with one another.
Claim 5
Dependent Claim
34 words
The set screw according to claim 1 wherein: a) said slot is a first slot; and including: b) a second slot extending radially inward from said threaded surface and intersecting with said bottom surface.
Claim 6
Dependent Claim
26 words
The set screw according to claim 4 wherein: a) said slots are diametrically opposed and said slots each extend between the top surface and bottom surface.
Claim 7
Dependent Claim
21 words
The set screw according to claim 1 including: a) a head secured to said base for rotating and torquing said base.
Claim 8
Dependent Claim
25 words
The set screw according to claim 6 wherein: a) said head is a breakaway head that breaks away from said base at a preselected torque.
Claim 9
Dependent Claim
18 words
The set screw according to claim 7 including: a) a breakaway region between said base and said head.
Claim 10
Dependent Claim
31 words
The set screw according to claim 7 wherein: a) said slot is not accessible when said screw is seated in a threaded bore and said head is secured to said base.
Claim 11
Dependent Claim
52 words
The set screw according to claim 1 in combination with first and second medical implants wherein: a) said first implant threadedly receives said set screw; and b) said second implant is operably held in locked position relative to said first implant by abutment of said set screw bottom against said second implant.
Claim 12
Dependent Claim
23 words
The set screw according to claim 10 wherein: a) said first implant includes a closed threaded bore to matingly receive said set screw.
Claim 13
Dependent Claim
36 words
A set screw according to claim 10 wherein: a) said first implant includes a pair of spaced arms having threaded facing surfaces and, in use, said set screw is threadedly received between said arm threaded surfaces.
Claim 14
Dependent Claim
16 words
The set screw according to claim 1 wherein: a) said slot has a generally rectangular cross-section.
Claim 15
Dependent Claim
16 words
The set screw according to claim 1 wherein: a) said slot has an arced inner surface.
Claim 16
Dependent Claim
16 words
The set screw according to claim 1 wherein: a) said slot has a V-shaped inner surface.
Claim 17
Dependent Claim
32 words
The set screw according to claim 1 wherein: a) said threaded surface includes a helically wound thread that is discontinuous in the region of said slot and has a fine thread type.
Claim 18
Dependent Claim
37 words
The set screw according to claim 15 wherein: a) said base has a diameter in the range from about 4 to 10 millimeters; and b) said thread has a pitch in the range from 0.3 to 1.5.
Claim 19
Dependent Claim
31 words
The set screw according to claim 16 wherein: a) said base has a major diameter from 5 to 6 millimeters and said pitch is in the range from 0.4 to 0.55.
Claim 20
Dependent Claim
64 words
In a set screw having a generally cylindrical shaped body with a radially outward threaded surfaces and a bottom surface that is generally planar; the improvement comprising: a) a slot intersecting with both said bottom surface and said threaded surface so as to produce edges along said bottom surface for operably gripping an object to be set by said set screw during usage thereof.
Claim 21
Dependent Claim
64 words
In a set screw having a generally cylindrical shaped body with a radially outward threaded surfaces and a bottom surface that is generally planar; the improvement comprising: a) a slot intersecting with both said bottom surface and said threaded surface so as to produce edges along said bottom surface for operably gripping an object to be set by said set screw during usage thereof.
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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) | 2005-09-23 | 2006-03-25 | 2006-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-09-23 | 2010-03-25 | 2010-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-09-23 | 2014-03-25 | 2014-09-24 | $7700.00 | Window Closed / Lapsed |