Facet distraction device, facet joint implant, and associated methods
View Patent ↗In various exemplary embodiments, the present invention provides devices, implants, and methods for distracting and/or stabilizing a facet joint of the spine of a patient or other similar joint or bony structures, optionally including modifying the facet joint and implanting an implant in the facet joint so as to distract the foramen in order to reduce compression on nerve roots.
1. A facet joint stabilization method, comprising:
drilling a first hole in a facet joint of a spine of a patient, the facet joint comprising a first facet and a second facet;
drilling a second hole in the facet joint, wherein the second hole is offset from the first hole;
positioning a facet joint stabilization device in the first and second holes, the facet joint stabilization device comprising:
an elongated body section having a length extending along an axis when viewed from a top surface of the facet joint stabilization device and having a width when viewed from the top surface extending at least substantially perpendicular to the length, wherein the length is greater than the width;
a substantially solid first lobe section protruding outwardly from the body section; and
a substantially solid second lobe section protruding outwardly from the body section, wherein the facet joint stabilization device is positioned in the first and second holes such that the substantially solid first lobe section engages bone material from the first facet and such that the substantially solid second lobe section engages bone material from the second facet, wherein the first lobe section and the second lobe section are offset with respect to one another in relation to the body section such that the first lobe section is positioned along a different portion of the length of the body section on a first side of the body section opposite from a second side of the body section on which the second lobe section is positioned, wherein the first lobe section is not symmetrical with respect to the second lobe section about the axis, and wherein the facet joint stabilization device is positioned in the first and second holes such that the first lobe section is positioned in the first hole and the second lobe section is positioned in the second hole.
2. The facet joint stabilization method of claim 1 , wherein one or more of the body section, the first lobe section, and the second lobe section comprise an outer material and an inner material, wherein the outer material is more compressible than the inner material.
3. The facet joint stabilization method of claim 2 , wherein a portion of the inner material protrudes through and beyond a surface of the outer material when the outer material is compressed in a facet joint space.
4. The facet joint stabilization method of claim 1 , further comprising:
drilling a third hole in a second facet joint of a spine of a patient, the second facet joint comprising a first facet and a second facet, and wherein the second facet joint is positioned on the opposite side of the patient's spine relative to the facet joint;
drilling a fourth hole in the second facet joint, wherein the fourth hole is offset from the third hole;
positioning a second facet joint stabilization device in the third and fourth holes, the second facet joint stabilization device comprising:
a body section;
a substantially solid first lobe section protruding outwardly from the body section; and
a substantially solid second lobe section protruding outwardly from the body section, wherein the second facet joint stabilization device is positioned in the second hole such that the substantially solid first lobe section engages bone material from the first facet of the second facet joint and such that the substantially solid second lobe section engages bone material from the second facet of the second facet joint, and wherein the second facet joint stabilization device differs from the first facet joint stabilization device so as to account for anatomical differences between the facet joint and the second facet joint, wherein the first lobe section and the second lobe section of the second facet joint stabilization device are offset with respect to one another in relation to the body section such that the first lobe section is positioned along a different portion of a length of the body section opposite from the second lobe section, and wherein the second facet joint stabilization device is positioned in the third and fourth holes such that the first lobe section is positioned in the third hole and the second lobe section is positioned in the fourth hole.
5. The facet joint stabilization method of claim 4 , wherein:
the position of the first lobe section of the first facet joint stabilization device relative to the second lobe section of the first facet joint stabilization device differs from the position of the first lobe section of the second facet joint stabilization device relative to the second lobe section of the second facet joint stabilization device such that the first facet joint stabilization device is configured for use in connection with a facet joint on the left side of the patient's spinal column and the second facet joint stabilization device is configured for use in connection with a facet joint on the right side of the patient's spinal column.
6. The facet joint stabilization method of claim 1 , wherein the body section has a substantially rectangular shape, and wherein each of the first lobe section and the second lobe section has a substantially semicircular shape.
7. The facet joint stabilization method of claim 1 , wherein the facet joint stabilization device comprises at least one of a prismatic structure and a tapering structure.
8. The facet joint stabilization method of claim 1 , wherein the first lobe section and the second lobe section are in alignment with respect to one another in relation to the body section.
9. The facet joint stabilization method of claim 1 , wherein the first lobe section and the second lobe section are offset with respect to one another in relation to the body section.
10. The facet joint stabilization method of claim 1 , wherein one or more of the body section, the first lobe section, and the second lobe section comprise one or more friction structures on an outer surface thereof, and wherein the facet joint stabilization device is positioned within the first and second holes such that the one or more friction surfaces firmly engage bone material defining a hole in the facet joint.
11. The facet joint stabilization method of claim 1 , wherein the facet joint stabilization device comprises one or more bone materials.
12. The facet joint stabilization method of claim 1 , further comprising distracting the facet joint prior to positioning the facet joint stabilization device in the first and second holes formed in the facet joint of the spine of the patient.