Patent US5797914A successfully refreshed from Google Patents.
US5797914A
Expired / Lapsed
US
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Bone screw
Assignee: KLS Martin LP
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Filing: 1996-09-12
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Granted: 1998-08-25
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Expires: 2016-09-12
Abstract
Abstract A bone screw for use in oral, maxofacial, and cranial surgery. The bone screw includes a screw head and body portion. The body portion includes a body tip, the body portion having a single flute being recessed in the area of the body tip and by the area enveloping the thread at the body tip being convex in shape. By this combination of features a bone screw is produced which is very easy to screw in, self-boring and self-tapping.
Inventors
- 👤 Karl A. Leibinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:53
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/56; A61B17/58; A61B17/68; A61B17/84; A61B17/86; A61B17/8625; A61B17/8635; A61B17/8605
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
156 words
A self-drilling and self-tapping bone screw for insertion into a bone, said bone screw comprising: a screw head; and a solid screw body extending from said screw head and including a tapered tip portion terminating at a pointed tip distal from said screw head and a shaft extending from said screw head to said tip portion, said screw body having a centerline and being provided with a continuous thread formed on said shaft and on said tip portion, said tip portion being provided with a recessed flute defined by two walls positioned essentially at a right-angle to one another, wherein a substantial portion of at least one of said two walls comprises a generally flat portion which extends from adjacent said pointed tip toward said screw head at a transposed distance from said centerline and at an acute angle to said centerline, and wherein adjacent said tip portion a profile of said continuous thread is convex.
Claim 2
Dependent Claim
156 words
A self-drilling and self-tapping bone screw for insertion into a bone, said bone screw comprising: a screw head; and a solid screw body extending from said screw head and including a tapered tip portion terminating at a pointed tip distal from said screw head and a shaft extending from said screw head to said tip portion, said screw body having a centerline and being provided with a continuous thread formed on said shaft and on said tip portion, said tip portion being provided with a recessed flute defined by two walls positioned essentially at a right-angle to one another, wherein a substantial portion of at least one of said two walls comprises a generally flat portion which extends from adjacent said pointed tip toward said screw head at a transposed distance from said centerline and at an acute angle to said centerline, and wherein adjacent said tip portion a profile of said continuous thread is convex.
Claim 3
Dependent Claim
22 words
A bone screw in accordance with claim 1, wherein said recessed flute extends longitudinally at least a length of said tip portion.
Claim 4
Dependent Claim
27 words
A bone screw in accordance with claim 1, wherein said transposed distance is approximately 0.05 to 0.4 mm and said acute angle is approximately 3° to 8°.
Claim 5
Dependent Claim
15 words
A bone screw in accordance with claim 3, wherein said acute angle is approximately 5°.
Claim 6
Dependent Claim
21 words
A bone screw in accordance with claim 1, wherein said flute has a length which is approximately 1 to 3 mm.
Claim 7
Dependent Claim
19 words
A bone screw in accordance with claim 5, wherein said flute has a length which is approximately 2 mm.
Claim 8
Dependent Claim
18 words
A bone screw in accordance with claim 1, wherein said screw head is designed as a countersunk head.
Claim 9
Dependent Claim
20 words
A bone screw in accordance with claim 7, wherein said screw head possesses an internal polygon in a centered position.
Claim 10
Dependent Claim
17 words
A bone screw in accordance with claim 8, wherein said internal polygon has fewer than six sides.
References Cited (Backward Citations)
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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) | 2001-08-24 | 2002-02-23 | 2002-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-08-24 | 2006-02-23 | 2006-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-08-24 | 2010-02-23 | 2010-08-25 | $7700.00 | Window Closed / Lapsed |