Surgical distraction device
AssigneeUniversity College London
InventorsGordon Blunn, John Perry, Hilali Noordeen, Jay Meswania, Justin Cobb
Life of this patent
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Abstract
A surgical distraction device is provided for applying extending or tensioning force non-invasively to a patient's skeleton or to an implant which comprises anchoring means for attaching first and second components of the device to a bone or to adjoining bones, said components being connected by a linkage of an extendible length, a magnet connected to the linkage via a reduction gearbox and actuating means located externally of the patient for generating a moving or varying electro-magnetic field, thereby causing the magnet to rotate and the linkage to be extended.
Claims13
A surgical distraction device for applying an extending or tensioning force non-invasively to a patient's skeleton or to an implant which comprises anchoring means for attaching first and second components of the device to a bone or to adjoining bones, said components being connected by a linkage of an extendable length, a magnet connected to the linkage via a reduction gearbox having two or more gear reduction stages whereby the gearbox has a gear ratio of 100:1 or greater and actuating means located externally of the patient for generating a moving or varying electro-magnetic field, thereby causing the magnet to rotate and the linkage to be extended.
An extendable endoprosthetic replacement device which comprises first and second components which are connected by a linkage of extendable length, the first component comprising a component of a limb joint and the second component having means for attachment to a resected long bone, a magnet connected to the linkage and means adapted for location externally of the patient for generating a moving electromagnetic field, thereby causing the magnet to rotate and the linkage to be extended wherein the magnet is connected to the linkage via a reduction gearbox having two or more gear reduction stages whereby the gearbox has a gear ratio of 100:1 or greater.
A surgical distraction device for correcting curvature of the spine which comprises first and second extension rods, each having attachment means at one end for fixing to a respective vertebra, a linkage for linking the rods so that the ends carrying attachment means are relatively moveable, said linkage being connected to a drive mechanism comprising a rotatable magnet and a reduction gearbox having two or more gear reduction stages whereby the gearbox has a gear ratio of 100:1 or greater and actuating means for location externally of the patient for generating a moving or varying electric/magnetic field, thereby causing the magnet to rotate and the attachment means on one rod to move relatively to the attachment means on the other rod.
Dependencies are inferred from the claim text.