Prosthetic spinal disc replacement
First Claim
1. An intervertebral artificial disc for replacement of a damaged spinal disc between two vertebrae having facing endplates comprising:
- a first rigid plate having a first surface configured and adapted to substantially engage with a first endplate of a first vertebral body, wherein said first rigid plate comprises a contoured, partially spherical seating surface;
a second rigid plate having a second surface configured and adapted to engage with a second endplate of a second vertebral body, wherein said second rigid plate comprises a contoured, partially cylindrical seating surface;
first core elements at least partially disposed between the first and second rigid plates, wherein said first core element comprises a first contoured surface in communication with and substantially corresponding to the curvature of the first rigid plate seating surface, and a second contoured surface substantially in communication with and substantially corresponding to the curvature of the second rigid plate seating surfaces,wherein the contact between the second rigid plate seating surface and the second contoured surface of the first core element forms a line of contacta third rigid plate configured and adapted to engage with the first endplate of the first vertebral body, wherein said third rigid plate comprises a contoured, partially spherical seating surface having substantially the same radius of curvature as the first rigid plate seating surface;
a fourth rigid plate configured and adapted to engage with the second endplate of the second vertebral body, wherein said fourth rigid plate comprises a contoured, partially cylindrical seating surface having substantially the same radius of curvature as the second rigid plate seating surface; and
a second core element at least partially disposed between the third and fourth rigid plates, wherein said second core element comprises a first contoured surface substantially corresponding to the curvature of the third rigid plate seating surface, and a fourth contoured surface substantially corresponding to the curvature of the fourth rigid plate seating surface;
wherein said third rigid plate, fourth rigid plate, and second core element form a second assemblywherein the first rigid plate having one portion of the semi-spherical curvature and the third rigid plate having a second portion of the semi-spherical curvature and the first and second portions define a complete spherical curvaturewherein the first rigid plate and the third rigid plate are spaced apart to maintain a constant diameter of the spherical curvature of the first and third rigid plates,wherein the second rigid plate comprises a constraining element for retaining the first core element within the contoured cylindrical seating surface;
wherein the fourth rigid plate comprises a constraining element for retaining the second core element within the contoured cylindrical seating surface.
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Accused Products
Abstract
The present invention relates generally to a prosthetic spinal disc for replacing a damaged disc between two vertebrae of a spine. The present invention also relates to a method for implanting a prosthetic spinal disc via posterior or posterior lateral implantation. Other surgical approaches for implanting the prosthetic disc may also be used. The present invention also involves a method for implanting the prosthetic spinal disc while either avoiding or minimizing contact with the spinal cord and nerve rootlets, or reducing the time and extent that they need to be repositioned during implantation.
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Citations
49 Claims
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1. An intervertebral artificial disc for replacement of a damaged spinal disc between two vertebrae having facing endplates comprising:
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a first rigid plate having a first surface configured and adapted to substantially engage with a first endplate of a first vertebral body, wherein said first rigid plate comprises a contoured, partially spherical seating surface; a second rigid plate having a second surface configured and adapted to engage with a second endplate of a second vertebral body, wherein said second rigid plate comprises a contoured, partially cylindrical seating surface; first core elements at least partially disposed between the first and second rigid plates, wherein said first core element comprises a first contoured surface in communication with and substantially corresponding to the curvature of the first rigid plate seating surface, and a second contoured surface substantially in communication with and substantially corresponding to the curvature of the second rigid plate seating surfaces, wherein the contact between the second rigid plate seating surface and the second contoured surface of the first core element forms a line of contact a third rigid plate configured and adapted to engage with the first endplate of the first vertebral body, wherein said third rigid plate comprises a contoured, partially spherical seating surface having substantially the same radius of curvature as the first rigid plate seating surface; a fourth rigid plate configured and adapted to engage with the second endplate of the second vertebral body, wherein said fourth rigid plate comprises a contoured, partially cylindrical seating surface having substantially the same radius of curvature as the second rigid plate seating surface; and a second core element at least partially disposed between the third and fourth rigid plates, wherein said second core element comprises a first contoured surface substantially corresponding to the curvature of the third rigid plate seating surface, and a fourth contoured surface substantially corresponding to the curvature of the fourth rigid plate seating surface; wherein said third rigid plate, fourth rigid plate, and second core element form a second assembly wherein the first rigid plate having one portion of the semi-spherical curvature and the third rigid plate having a second portion of the semi-spherical curvature and the first and second portions define a complete spherical curvature wherein the first rigid plate and the third rigid plate are spaced apart to maintain a constant diameter of the spherical curvature of the first and third rigid plates, wherein the second rigid plate comprises a constraining element for retaining the first core element within the contoured cylindrical seating surface; wherein the fourth rigid plate comprises a constraining element for retaining the second core element within the contoured cylindrical seating surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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37. A method for replacing a damaged spinal disc between two vertebrae having facing endplates with an artificial disc comprising the steps of:
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removing a damaged spinal disc disposed between a first vertebral body and a second vertebral body; providing a first artificial disc assembly comprising; a first rigid plate configured and adapted to engage with a first endplate of the first vertebral body, wherein said first rigid plate comprises a contoured, partially spherical seating surface; a second rigid plate configured and adapted to engage with a second endplate of the second vertebral body, wherein said second rigid plate comprises a contoured, partially cylindrical seating surface; and a first core element at least partially disposed between the first and second rigid plates, wherein said first core element comprises a first contoured surface in communication with and substantially corresponding to the curvature of the first rigid plate seating surface, and a second contoured surface substantially in communication with and substantially corresponding to the curvature of the second rigid plate seating surface; a third rigid plate configured and adapted to engage with the first endplate of the first vertebral body, wherein said third rigid plate comprises a contoured, partially spherical seating surface having substantially the same radius of curvature as the first rigid plate seating surface; a fourth rigid plate configured and adapted to engage with the second endplate of the second vertebral body, wherein said fourth rigid plate comprises a contoured, partially cylindrical seating surface having substantially the same radius of curvature as the second rigid plate seating surface; and a second core element at least partially disposed between the third and fourth rigid plates, wherein said second core element comprises a first contoured surface substantially corresponding to the curvature of the third rigid plate seating surface, and a fourth contoured surface substantially corresponding to the curvature of the fourth rigid plate seating surface; wherein said third rigid plate, fourth rigid plate, and second core element form a second assembly wherein the first rigid plate having one portion of the semi-spherical curvature and the third rigid plate having a second portion of the semi-spherical curvature and the first and second portions define a, complete spherical curvature, wherein the first rigid plate and the third rigid plate are spaced apart to maintain a constant diameter of the spherical curvature of the first and third rigid plates, wherein the second rigid plate comprises a constraining element for retaining the first core element within the contoured cylindrical seating surface; wherein the fourth rigid plate comprises a constraining element for retaining the second core element within the contoured cylindrical seating surface removing at least a portion of a posterior element of the spine, preparing the first endplate and second endplate for receiving the artificial disc assembly; positioning the first artificial disc assembly between the first and second vertebral bodies such that the first rigid plate at least partially engages with the first endplate of the first vertebral body and the second rigid plate at least partially engages with the second endplate of the second vertebral body. - View Dependent Claims (38, 39, 40, 41, 42, 43)
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44. An intervertebral artificial disc for replacement of a damaged spinal disc between two vertebrae having facing endplates comprising:
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a first rigid plate having a first surface configured and adapted to substantially engage with a first endplate of a first vertebral body, wherein said first rigid plate comprises a contoured, partially spherical seating surface; a second rigid plate having a second surface configured and adapted to engage with a second endplate of a second vertebral body, wherein said second rigid plate comprises a contoured, partially spherical seating surface; a first core element at least partially disposed between the first and second rigid plates, wherein said first core element comprises a first contoured surface in communication with and substantially corresponding to the curvature of the first rigid plate seating surface, and a second contoured surface substantially in communication with and substantially corresponding to the curvature of the second rigid plate seating surface; a third rigid plate configured and adapted to engage with the first endplate of the first vertebral body, wherein said third rigid plate comprises a contoured, partially spherical seating surface having substantially the same radius of curvature as the first rigid plate seating surface; a fourth rigid plate configured and adapted to engage with the second endplate of the second vertebral body, wherein said fourth rigid plate comprises a contoured, partially cylindrical seating surface having substantially the same radius of curvature as the second rigid plate seating surface; and a second core element at least partially disposed between the third and fourth rigid plates, wherein said second core element comprises a first contoured surface substantially corresponding to the curvature of the third rigid plate seating surface, and a fourth contoured surface substantially corresponding to the curvature of the fourth rigid plate seating surface; wherein said third rigid plate, fourth rigid plate, and second core element form a second assembly wherein the first rigid plate having one portion of the semi-spherical curvature and the third rigid plate having a second portion of the semi-spherical curvature and the first and second portions define a complete spherical curvature, wherein the first rigid plate and the third rigid plate are spaced apart such that the spherical curvature of the first and third rigid plates are maintained at a constant diameter, wherein the second rigid plate comprises a constraining element for retaining the first core element within the contoured cylindrical seating surface; wherein the fourth rigid plate comprises a constraining element for retaining the second core element within the contoured cylindrical seating surface; wherein the contact between the second rigid plate seating surface and the second contoured surface of the first core element forms a line of contact wherein the intervertebral artificial disc is capable providing of a moving instantaneous axis of rotation substantially in the sagittal plane. - View Dependent Claims (45, 46, 47, 48, 49)
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Specification