16-05-2013 дата публикации
Номер: US20130123847A1
An implant for expanding a spinal canal having an upper portion, a lower portion, and an inner member. The inner member communicates with a swivelable coupling located at each end of the inner member within the implant. Each swivelable coupling also interacts with a respective one of the upper and lower portion, within an inner bore thereof. Accordingly, movement of the inner member relative to one or both of the upper and the lower portions, via one or both swivelable couplings, translates the upper portion away from the lower portion, about a vertebral cut, to widen the vertebral cut and expand the spinal canal. The swivelable action of the couplings during translation allows angulation of the inner member, relative to a longitudinal axis of the implant, to accommodate a natural lateral shift occurring during a widening of a vertebral cut. 1. An implant for expanding a spinal canal , comprising:an upper portion and a lower portion, each having an inner bore;an inner member configured to communicate with a swivelable coupling at each end thereof, each swivelable coupling configured to interact with a respective upper or lower portion, within the inner bore thereof, wherein movement of the inner member relative to one or both of the upper and the lower portions, via one or both swivelable couplings, translates the upper portion away from the lower portion, about a vertebral cut, to widen the vertebral cut, thereby expanding the spinal canal, wherein swivelable action of the couplings during translation allows angulation of the inner member, relative to a longitudinal axis of the implant, to accommodate a change in shape of a vertebra during widening of the vertebral cut.2. The implant of claim 1 , wherein the inner bore of each of the upper and the lower portions is conically shaped to accommodate angulation of the inner member during translation claim 1 , whereby the inner member angulation compensates for a lateral shift of the upper portion relative to the lower ...
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