Spinal implants
First Claim
Patent Images
1. A spinal implant comprising:
- a superior surface and an inferior surface opposite the superior surface, at least one of the superior surface and the inferior surface comprising a plurality of teeth;
a posterior portion having a leading edge;
wherein the leading edge of the posterior portion forms a central notch along a medial-lateral midline of the implant, the central notch resulting in two posterior points of the leading edge that are at a posterior-most point of the spinal implant and that are configured to rest against a spine and to provide a stable resting position for the spinal implant during impaction, the two posterior points of the leading edge comprising a first posterior point on a medial side of the spinal implant and a second posterior point on a lateral side of the spinal implant;
wherein the leading edge of the posterior portion further forms a medial notch on the medial side of the spinal implant, the medial notch being medial and anterior to the first posterior point of the leading edge on the medial side of the spinal implant;
wherein the leading edge of the posterior portion further forms a lateral notch on the lateral side of the spinal implant, the lateral notch being lateral and anterior to the second posterior point of the leading edge on the lateral side of the spinal implant; and
wherein the medial notch and the lateral notch are configured to reduce the likelihood of tissue compression against a nerve root once the spinal implant is implanted.
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Abstract
Disclosed are improved spinal implants that are configured to help prevent post-operative migration of the implant. In some embodiments, the implant system includes multi-axial tooth geometry and other geometrical configurations such as but not limited to peripheral curvatures that aid in the prevention of such post-operative migration. Also disclosed are asymmetrical implants having superior and inferior surfaces with different angulations relative to the sagittal midline.
95 Citations
19 Claims
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1. A spinal implant comprising:
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a superior surface and an inferior surface opposite the superior surface, at least one of the superior surface and the inferior surface comprising a plurality of teeth; a posterior portion having a leading edge; wherein the leading edge of the posterior portion forms a central notch along a medial-lateral midline of the implant, the central notch resulting in two posterior points of the leading edge that are at a posterior-most point of the spinal implant and that are configured to rest against a spine and to provide a stable resting position for the spinal implant during impaction, the two posterior points of the leading edge comprising a first posterior point on a medial side of the spinal implant and a second posterior point on a lateral side of the spinal implant; wherein the leading edge of the posterior portion further forms a medial notch on the medial side of the spinal implant, the medial notch being medial and anterior to the first posterior point of the leading edge on the medial side of the spinal implant; wherein the leading edge of the posterior portion further forms a lateral notch on the lateral side of the spinal implant, the lateral notch being lateral and anterior to the second posterior point of the leading edge on the lateral side of the spinal implant; and wherein the medial notch and the lateral notch are configured to reduce the likelihood of tissue compression against a nerve root once the spinal implant is implanted. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A spinal implant comprising:
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a superior surface and an inferior surface opposite the superior surface, at least one of the superior surface and the inferior surface comprising a plurality of teeth on a medial side of the spinal implant and a plurality of teeth on a lateral side of the spinal implant; a posterior portion having a leading edge; an anterior wall; and a tool insertion point in the anterior wall that is positioned along a medial-lateral midline of the spinal implant; wherein the plurality of teeth on the medial side of the spinal implant each have a tooth edge at a peak of each tooth that is configured to contact a vertebral endplate; wherein the tooth edges of the plurality of teeth on the medial side of the spinal implant define a longitudinal axis of each tooth; wherein the longitudinal axes of the plurality of teeth on the medial side of the spinal implant are parallel with one another; wherein the plurality of teeth on the lateral side of the spinal implant each have a tooth edge at a peak of each tooth that is configured to contact the vertebral endplate; wherein the tooth edges of the plurality of teeth on the lateral side of the spinal implant define a longitudinal axis of each tooth; wherein the longitudinal axes of the plurality of teeth on the medial side of the spinal implant meet at the medial-lateral midline with corresponding longitudinal axes of the plurality of teeth on the lateral side of the spinal implant, wherein the leading edge of the posterior portion forms a central notch along the medial-lateral midline of the spinal implant, the central notch resulting in two posterior points of the leading edge that are at a posterior-most point of the spinal implant and that are configured to rest against a spine and to provide a stable resting position for the spinal implant during impaction, the two posterior points of the leading edge comprising a first posterior point on the medial side of the spinal implant and a second posterior point on the lateral side of the spinal implant; wherein the leading edge of the posterior portion further forms a medial notch on the medial side of the spinal implant, the medial notch being medial and anterior to the first posterior point of the leading edge on the medial side of the spinal implant; wherein the leading edge of the posterior portion further forms a lateral notch on the lateral side of the spinal implant, the lateral notch being lateral and anterior to the second posterior point of the leading edge on the lateral side of the spinal implant; and wherein the medial notch and the lateral notch are configured to reduce the likelihood of tissue compression against a nerve root once the spinal implant is implanted. - View Dependent Claims (16, 17)
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18. A spinal implant comprising:
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a body for holding graft material therein; a superior surface and an inferior surface opposite the superior surface, at least one of the superior surface and the inferior surface comprising a plurality of teeth on a medial side of the spinal implant and a plurality of teeth on a lateral side of the spinal implant; an anterior wall; a tool insertion point in the anterior wall that is positioned along a medial-lateral midline of the spinal implant, the tool insertion point comprising an anterior surface of the anterior wall having a recessed rectangular slot with a cylindrical opening extending from a recessed surface of the recessed slot to a posterior surface of the anterior wall; wherein the plurality of teeth on the medial side of the spinal implant each have a tooth edge at a peak of each tooth that is configured to contact a vertebral endplate; wherein the tooth edges of the plurality of teeth on the medial side of the spinal implant define a longitudinal axis of each tooth; wherein the longitudinal axes of the plurality of teeth on the medial side of the spinal implant are parallel with one another and at a non-ninety degree angle with the medial-lateral midline of the spinal implant; wherein the plurality of teeth on the lateral side of the spinal implant each have a tooth edge at a peak of each tooth that is configured to contact the vertebral endplate; wherein the tooth edges of the plurality of teeth on the lateral side of the spinal implant define a longitudinal axis of each tooth; wherein the longitudinal axes of the plurality of teeth on the lateral side of the spinal implant are parallel with one another and at a non-ninety degree angle with the medial-lateral midline of the spinal implant; wherein the superior surface comprises a superior surface curvature, wherein the inferior surface comprises an inferior surface curvature, and wherein the superior surface curvature and the inferior surface curvature are asymmetric in at least one of a medial-lateral plane of the spinal implant and an anterior-posterior plane of the spinal implant; wherein the longitudinal axes of the plurality of teeth on the medial side of the spinal implant intersect at the medial-lateral midline with corresponding longitudinal axes of the plurality of teeth on the lateral side of the spinal implant so as to form V-shaped or U-shaped intersections, wherein the spinal implant further comprises a posterior portion having a leading edge; wherein the leading edge of the posterior portion forms a central notch along the medial-lateral midline of the spinal implant, the central notch resulting in two posterior points of the leading edge that are at a posterior-most point of the spinal implant and that are configured to rest against a spine and to provide a stable resting position for the spinal implant during impaction, the two posterior points of the leading edge comprising a first posterior point on the medial side of the spinal implant and a second posterior point on the lateral side of the spinal implant; wherein the leading edge of the posterior portion further forms a medial notch on the medial side of the spinal implant, the medial notch being medial and anterior to the first posterior point of the leading edge on the medial side of the spinal implant; wherein the leading edge of the posterior portion further forms a lateral notch on the lateral side of the spinal implant, the lateral notch being lateral and anterior to the second posterior point of the leading edge on the lateral side of the spinal implant; and wherein the medial notch and the lateral notch are configured to reduce the likelihood of tissue compression against a nerve root once the spinal implant is implanted. - View Dependent Claims (19)
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Specification