Spinal flexion and extension motion damper
View Patent ↗An orthopedic damper system and method to control the degree of flexion and/or extension motion of the mobile vertebral segment while providing additional stability to the spine. The damper system includes an anchor having a spring hitch, a spring coupled to the spring hitch, and a cap coupled to the spring. The anchor is adapted to connect to a spinous process. The spring includes an inner hollow area adapted to accommodate the spring hitch. The cap includes an opening connected to an inner cavity that is adapted to accommodate the spring and the spring hitch.
1. An orthopedic damper system comprising:
a U-shaped anchor adapted to connect to a spinous process, wherein said U-shaped anchor comprises a spring hitch;
a spring coupled to said spring hitch, wherein said spring comprises an inner hollow area that accommodates said spring hitch; and
a cap coupled to said spring, wherein said cap comprises:
a non-bifurcated body;
an opening connected to an inner cavity that accommodates said spring and said spring hitch, wherein said opening is positioned at a first end of said non-bifurcated body of said cap;
a closed end positioned at a second end opposite to said first end of said non-bifurcated body, wherein a distance between said first end and said second end equals a total length of said cap;
a partially threaded hole positioned proximate to said closed end; and
a cross-opening positioned proximate to said closed end,
wherein both said hole and said cross-opening are perpendicular to one another and are positioned at an end of said cap opposite to said opening of said cap.
2. The damper system of claim 1 , wherein said U-shaped anchor further comprises:
a plurality of arms each having a plurality of screw holes positioned opposite to said spring hitch; and
a slot configured between said plurality of arms.
3. The damper system of claim 2 , further comprising a plurality of retaining mechanisms that fixes into said spinous process, wherein said plurality of screw holes accommodate said plurality of retaining mechanisms, and said slot is adapted to accommodate said spinous process.
4. The damper system of claim 1 , wherein said hole is bored completely through a first dimension of said cap and said hole further comprises threading etched completely along said first dimension of said hole.
5. The damper system of claim 4 , wherein said cross-opening of said cap accommodates a bar of a cross-connector assembly.
6. The damper system of claim 4 , wherein said hole of said cap accommodates a fixation component to set said bar of said cross-connector assembly to said cap.
7. The damper system of claim 5 , wherein said cross-connector assembly connects with a pair of polyaxial pedicle screw assemblies.
8. An apparatus for stabilizing a vertebral segment, said apparatus comprising:
an anchor adapted to connect to a spinous process, wherein said anchor comprises a clamping portion and a hitch connected to said clamping portion;
fixation means that attaches said anchor to said spinous process;
a first spring coupled to said anchor, wherein said first spring comprises an inner hollow area that accommodates said hitch of said anchor; and
a cylindrical cap coupled to said first spring, wherein said cylindrical cap comprises:
an opening leading to an inner cavity, wherein said inner cavity accommodates said first spring and said hitch of said anchor;
a non-forked closed end positioned at an opposite end to said opening, wherein a distance between said opening and said closed end equals a total length of said cap;
a cross-opening,
wherein both said inner cavity and said cross-opening are perpendicular to one another, and
wherein said cross-opening is positioned at an end of said cap opposite to said opening of said cap.
9. The apparatus of claim 8 , further comprising a second spring positioned in said cylindrical cap and adjacent to said hitch.
10. The apparatus of claim 8 , wherein said cross-opening of said cylindrical cap accommodates a bar of a cross-connector assembly.
11. The apparatus of claim 8 , wherein said fixation means attaches said anchor to said spinous process, said fixation means comprises any of screws, fasteners, pins, nails, and corrugated teeth.
12. The apparatus of claim 10 , wherein said cylindrical cap further comprises a hole that accommodates a fixation component to set said bar of said cross-connector assembly to said cylindrical cap.
13. The apparatus of claim 10 , wherein said cross-connector assembly connects with a pair of oppositely positioned polyaxial pedicle screw assemblies.
14. A method of controlling a degree of motion of a mobile vertebral segment, said method comprising:
fixing an anchor of a damper system to a spinous process, wherein said damper system comprises said anchor, a spring comprising an inner hollow area that attaches to said anchor, and a non-forked cylindrical cap that accommodates said spring and a portion of said anchor, wherein said cylindrical cap comprises a threaded hole bored therethrough, and a cross-opening bored perpendicular to said threaded hole and intersecting said threaded hole;
coupling said spring to said portion of said anchor;
inserting said spring and said portion of said anchor into said cylindrical cap;
inserting a bar of a cross-connector assembly through said cross-opening of said cylindrical cap, wherein said bar of said cross-connector intersects said threaded hole;
connecting said cross-connector assembly to a pair of opposed polyaxial pedicle screw assemblies connected to oppositely positioned pedicles; and
biasing said spring to control a motion of said spinous process and said oppositely positioned pedicles.
15. The method of claim 14 , further comprising inserting a second spring into said cylindrical cap and adjacent to said portion of said anchor in said cylindrical cap.
16. The method of claim 14 , further comprising inserting a fixation component into said cylindrical cap to set said bar of said cross-connector assembly to said cylindrical cap.
17. The method of claim 14 , wherein said cross-connector assembly maintains and secures the posture of a vertebral column.
18. The method of claim 14 , wherein said pair of opposed polyaxial pedicle screw assemblies connect two adjacent vertebrae by spinal fusion.
19. The method of claim 14 , wherein said spring controls a degree of flexion of a vertebral segment.
20. The method of claim 14 , wherein said anchor further comprises a slot that accommodates said spinous process.