Surgery – Instruments – Orthopedic instrumentation
Patent
1993-04-16
1995-04-25
Graysay, Tamara L.
Surgery
Instruments
Orthopedic instrumentation
411389, 411187, 411397, A61B 1756
Patent
active
054094860
ABSTRACT:
A straight, double-threaded arthrodesis screw that comprises a threaded compression nut mounted thereon. The screw consists of a shank containing distal right-handed threads for screwable connection with a threaded hole in the bone, proximal left-handed threads on which the compression nut is screwably mounted, and a longitudinal perforation for engagement with an installation tool. A hole is first drilled and tapped in the bone to provide an internal right-handed thread conforming to the distal threads of the arthrodesis screw. The screw is installed on the bone by screwably mounting its distal portion in the hole. The compression nut is then rotated toward the proximal cortex of the bone until it contacts the soft tissue surrounding the hole in the bone. The soft tissue is secured in place between the compression nut and the bone's cortical surface by further screwing the distal threads into the bone while preventing the compression nut from turning with respect to the clamped tissue. The proximal excess portion of the screw is then cut and removed along with the installation tool. In another embodiment of the invention for use as a clamping device for fractured bone parts, the arthrodesis screw is passed through a perforation across the bone fracture and the distal threads of the screw are mounted on a distal portion of the fractured bone; a modified compression nut is then forced into the perforation in the proximal portion of the fractured bone and tightened to provide a retaining arthrodesis clamp.
REFERENCES:
patent: 4059102 (1977-11-01), Devas
patent: 4723541 (1988-02-01), Reese
patent: 4796612 (1989-01-01), Reese
patent: 4903692 (1990-02-01), Reese
Durando Antonio R.
Graysay Tamara L.
Phoenix Surgical Products, Inc.
Weiss Harry M.
LandOfFree
Double threaded arthrodesis screw does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Double threaded arthrodesis screw, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Double threaded arthrodesis screw will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1564923