1576 results about "Bone plate" patented technology

A bone fixation assembly for securing a fixation device such as a bone plate, to bone includes a fixation device, including at least a through hole with isolated protrusions (such as pegs or spikes); and locking bone engaging members such as screws. The screw has a shank with a thread for engaging bone and a partial sphere head with a thread configured and dimensioned to match with the isolated protrusions of the hourglass shaped through holes of the bone plate. The bone plate has a through hole shaped like an hourglass which diameter matches that of the screw spherical head and is provided with multiple isolated protrusions. In use, the screw is threaded into the bone, through the hole of the bone plate at a selected angle. The partial sphere head of the screw engages in the protrusions of the plate hole resulting in the strong locking of the screw at the selected orientation within the through hole in just one single surgical action.

Devices formed of or including biocompatible polyhydroxyalkanoates are provided with controlled degradation rates, preferably less than one year under physiological conditions. Preferred devices include sutures, suture fasteners, meniscus repair devices, rivets, tacks, staples, screws (including interference screws), bone plates and bone plating systems, surgical mesh, repair patches, slings, cardiovascular patches, orthopedic pins (including bone filling augmentation material), adhesion barriers, stents, guided tissue repair / regeneration devices, articular cartilage repair devices, nerve guides, tendon repair devices, atrial septal defect repair devices, pericardial patches, bulking and filling agents, vein valves, bone marrow scaffolds, meniscus regeneration devices, ligament and tendon grafts, ocular cell implants, spinal fusion cages, skin substitutes, dural substitutes, bone graft substitutes, bone dowels, wound dressings, and hemostats. The polyhydroxyalkanoates can contain additives, be formed of mixtures of monomers or include pendant groups or modifications in their backbones, or can be chemically modified, all to alter the degradation rates. The polyhydroxyalkanoate compositions also provide favorable mechanical properties, biocompatibility, and degradation times within desirable time frames under physiological conditions.

A method for joining first and second bones is provided. The method comprises inserting between the side surfaces of the bones a base plate having a first end nearer the first bone and a second end nearer the second bone. The base plate has a first screw hole extending through the first end and a second screw hole extending through the second end. A first bone screw is introduced through the first screw hole and into the first bone. The first bone screw is introduced at an angle relative to the top surface of the bone ranging from about 20° to about 60°. A second bone screw is introduced through the second screw hole and into the second bone. The second bone screw is introduced at an angle relative to the top surface of the bone ranging from about 20° to about 70°. At least a part of the first bone screw and at least a part of the second bone screw are covered to prevent the first and second bone screws from backing out of the first and second bones, respectively.

A bone screw having a head portion and a threaded shaft extending therefrom is described. The head portion has a top surface with a drive means formed therein coaxial with the threaded shaft and a profiled portion between the top surface and the threaded shaft. The profiled portion of the body is provided with a circumferential groove on its surface, substantially coaxial with the threaded shaft.

A bone plate is provided for fixation of spaced vertebra. The bone plate has at least one through passage for securing the plate to bone with a bone fixation screw. The threaded shaft of a bone fixation screw is inserted through a bushing located in the through passage of the bone plate and the screw is thereby threadably secured to the underlying bone and the bushing is then compressed inward against the head of the screw with cams that are actuated by rotating the bushing in the through passage whereby the screw is locked relative to the bone plate. The bushing is not only compressed inwardly against the head of the screw but is also compressed downwardly by the cams into a seat to clamp separate elements of the bone plate together.