Intramedullary skeletal distractor and method
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United States of America Patent
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Jan 6, 1998
Grant Date -
N/A
app pub date -
Apr 9, 1996
filing date -
Apr 9, 1996
priority date (Note) -
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Abstract
A device for effecting progressive elongation of a sectioned bone having no extracutaneous elements, and a method for using the device, are presented. The device, which includes a pair of telescopically engaged cylindrical members, is inserted into the medullary space of the bone, and one cylindrical member is affixed to each section of bone. Under the normal torsions experienced by the affected limb, a clutch mechanism is provided that causes the cylindrical members to be forced apart, separating the sections of bone, at which site new bone growth is stimulated. Rotations as small as 1 degree are sufficient to activate elongation. A mechanism is also provided for sensing and measuring the amount of elongation that has occurred extracutaneously. In an alternate embodiment, instead of the clutch mechanism, elongation is achieved by magnetically driving an internal component with an externally applied magnetic field.
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