Importance

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Abstract

An orthopedic device is described for stabilizing the spinal column between first and second vertebral bodies. The device has first and second screws adapted for fixation to the first and second vertebral bodies, respectively. The device further includes an elongated ligament with a first end connected to the first screw and the second end operatively connected with the second screw. The ligament is made preferably of a nickel titanium alloy selected to have ductile inelastic properties at body temperature and is capable of plastic deformation to allow relative constrained motion between the vertebral bodies. The preferred nickel titanium has a martensite/austenite transition temperature above body temperature. In a preferred embodiment, the second pedicle screw includes a bearing for receiving the ligament in a slidably engageable relationship. The device further includes optional first and second dampening members surrounding the ligament for restraining the spinal column during flexion and extension.

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First Claim