Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having structure to restrict rotation of threaded – mating... – Comprising a thread lock
Patent
1990-11-27
1992-06-09
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having structure to restrict rotation of threaded, mating...
Comprising a thread lock
411310, 411426, 606 73, F16B 3930
Patent
active
051201712
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.
REFERENCES:
patent: Re28111 (1971-01-01), Laverty
patent: D51291 (1917-09-01), Vorel
patent: D52511 (1918-01-01), Groh
patent: 197933 (1877-12-01), Harvey
patent: 1891895 (1932-12-01), Nagel
patent: 1980093 (1934-11-01), Rosenberg
patent: 2005672 (1935-06-01), Chaffee
patent: 2570465 (1951-10-01), Lundholm
patent: 2696817 (1954-12-01), Prevo
patent: 2702543 (1955-02-01), Pugh et al.
patent: 2772676 (1956-12-01), Pohl
patent: 3109691 (1963-11-01), Burkhardt
patent: 3233500 (1966-02-01), de Vellier
patent: 3466748 (1969-09-01), Christensen
patent: 3492906 (1970-02-01), Hauser
patent: 3703843 (1972-11-01), Laverty
patent: 3861269 (1975-01-01), Laverty
patent: 4175555 (1979-11-01), Herbert
patent: 4177524 (1979-12-01), Grell et al.
patent: 4261351 (1981-04-01), Scherfel
patent: 4463753 (1984-08-01), Gustilo
patent: 4569338 (1986-02-01), Edwards
patent: 4640271 (1987-02-01), Lower
patent: 4756653 (1988-07-01), Berger
patent: 4791918 (1988-12-01), Von Hasselbach
patent: 4870957 (1989-10-01), Goble et al.
"Youngstown Sliding Lag Screw and Plate" News Release dated Sep. 1, 1988.
"Dr. Virgin Hip Fixation Screw", Surgical Equipment, vol. 7, No. 4, pp. 14 and 15, Jul., 1940.
Stuart Surgical
Wilson Neill R.
LandOfFree
Bone screw with improved threads does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Bone screw with improved threads, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Bone screw with improved threads will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1800662