Device for dynamic posterior stabilisation matching the anatomic lordosis

摘要

The a device is provided for dynamic posterior stabilization. The device combines includes a mobile piston rod with a piston head at an end thereof; a viscoelastic shock-absorbing unit having a convex surface; a fixed rod defining an angle relative to an axis of a casing and the fixed rod including, at an end thereof, a concave surface; a viscoelastic ring; and wherein the viscoelastic components are contained within the casing.

主权项

1. A dynamic posterior stabilization device, comprising:
a fixed rod having a first end, the first end having a concave surface; a cap affixed to the first end of the fixed rod such that the concave surface of the first end is housed within an interior volume of the cap; a mobile piston having a shaft and a head end, the shaft being disposed through an orifice of the cap such that the head end of the mobile piston is housed within the interior volume of the cap; a viscoelastic ring disposed around the shaft of the mobile piston and between the cap and the head end of the mobile piston; a viscoelastic shock-absorbing pad having a convex face, the viscoelastic shock-absorbing pad being disposed between the head end of the mobile piston and the concave surface of the first end of the fixed rod such that the convex face contacts the concave surface of the first end of the fixed rod for centering the viscoelastic pad on the first end of the fixed rod without contacting the cap; and wherein the fixed rod has a longitudinal axis which is disposed at an oblique angle relative to a longitudinal axis of the cap.