
US Patent No: 5,120,171
Number of patents in Portfolio can not be more than 2000
Bone screw with improved threads
Stats
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Jun 9, 1992
Issued date -
Nov 27, 1990
filing date -
07/618,500
serial no -
Expired
status
Importance
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Abstract
A bone screw having a helical thread that gradually increases in thickness from the tip to the head of the screw. The thin thread at the tip of the screw can be inserted into a bone with minimal tearing or cracking of the bone. The thicker treads ascending form the tip to the head of the screw displaces bone against the superior (top) thread surfaces. This displacement of bone increases the screw's resistance to being pulled-out of the bone. The thicker core just below the screw head increases the screw's ability to withstand compressive and distractive loads. The core is thickest just below the head because it is at that point on the screw that the fulcrum loads are greatest.
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First Claim
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International Classification(s)
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- [Patents Count]
Cited Art
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
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| 4,640,271 Bone screw | 101 | 1985 | |
| 4,870,957 Ligament anchor system | 312 | 1988 | |
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| 4,569,338 Sacral fixation device | 61 | 1984 | |
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| 4,261,351 Medullary cavity pin | 22 | 1979 | |
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| 4,756,653 Fastening element for securing packing sheets | 14 | 1983 | |
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| 4,463,753 Compression bone screw | 200 | 1981 | |
| 4,791,918 Femoral-neck implant | 32 | 1986 | |