Intervertebral prosthetic device for spinal stabilization and method of implanting same
First Claim
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1. A method of implanting a prosthetic device comprising:
- inserting a single-piece spacer between a superior vertebra and an adjacent inferior vertebra;
the spacer having a center and comprising;
a posterior portion comprising;
first and second spinous-process receiving notches;
first, second, third, and fourth flanges;
the first and second flanges forming the first notch;
the third and fourth flanges forming the second notch oriented generally opposite the first notch;
an intermediate section abutting the first, second, third, and fourth flanges;
the intermediate section separating the first notch from the second notch;
the intermediate section having a posterior face that is flush with both a posterior face of the first flange and a posterior face of the second flange;
an anterior portion having a fifth flange forming a groove with the first flange, the groove forming an upwardly facing concave surface;
the first notch and groove each having respective minimum points;
wherein the spacer is monolithically formed;
receiving a spinous process of the superior vertebra in the first notch and receiving a portion of the inferior vertebra in the second notch such that the first and second notches extend through a sagittal plane defined by the superior and inferior vertebrae;
wherein, after the receiving step and when the spacer is viewed normal to the sagittal plane, the minimum point of the groove is disposed along an upper perimeter profile of the spacer at a point closest to the center of the spacer and the minimum point of the groove is positioned vertically above the minimum point of the first notch;
wherein the anterior portion is disposed more anteriorly than the posterior portion.
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Abstract
An intervertebral prosthetic device for spinal stabilization and a method of using same according to which a body member is implanted between two adjacent vertebrae so that a spinous processes of a vertebrae extends into a notch formed in the body member. A groove is also formed in the body member that engages one of the vertebrae.
258 Citations
19 Claims
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1. A method of implanting a prosthetic device comprising:
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inserting a single-piece spacer between a superior vertebra and an adjacent inferior vertebra;
the spacer having a center and comprising;a posterior portion comprising; first and second spinous-process receiving notches; first, second, third, and fourth flanges;
the first and second flanges forming the first notch;
the third and fourth flanges forming the second notch oriented generally opposite the first notch;an intermediate section abutting the first, second, third, and fourth flanges;
the intermediate section separating the first notch from the second notch;the intermediate section having a posterior face that is flush with both a posterior face of the first flange and a posterior face of the second flange; an anterior portion having a fifth flange forming a groove with the first flange, the groove forming an upwardly facing concave surface; the first notch and groove each having respective minimum points; wherein the spacer is monolithically formed; receiving a spinous process of the superior vertebra in the first notch and receiving a portion of the inferior vertebra in the second notch such that the first and second notches extend through a sagittal plane defined by the superior and inferior vertebrae; wherein, after the receiving step and when the spacer is viewed normal to the sagittal plane, the minimum point of the groove is disposed along an upper perimeter profile of the spacer at a point closest to the center of the spacer and the minimum point of the groove is positioned vertically above the minimum point of the first notch; wherein the anterior portion is disposed more anteriorly than the posterior portion. - View Dependent Claims (2, 3, 4, 5)
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6. An prosthetic device for insertion between first and second vertebrae, the device comprising:
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a single-piece body having an posterior portion and an anterior portion; the posterior portion comprising; first and second spinous-process receiving notches; first, second, third, and fourth flanges;
the first and second flanges forming the first notch;
the third and fourth flanges forming the second notch;an intermediate section abutting the first, second, third, and fourth flanges; the intermediate section separating the first notch from the second notch;
the intermediate section having a posterior face that is flush with both a posterior face of the first flange and a posterior face of the second flange;the anterior portion having a fifth flange forming a first groove with the first flange, the first groove forming an upwardly facing concave surface; the anterior portion having a sixth flange forming a second groove with the third and fourth flanges the first notch and first groove each having respective minimum points; wherein the body is monolithically formed; wherein the body is configured such that when the body is inserted directly between the first and second vertebrae; the first notch forms a superiorly facing concave surface and extends through a sagittal plane defined by the first and second vertebrae; the second notch forms an inferiorly facing concave surface and extends through the sagittal plane; the second groove opens inferiorly, extends laterally, and is disposed more anteriorly than the first and second notches; wherein the body is configured such that when the body is inserted between the first and second vertebrae and viewed normal to the sagittal plane, the minimum point of the first groove is disposed along an upper perimeter profile of the body at a point closest to the center of the body and the minimum point of the first groove is positioned vertically above the minimum point of the first notch. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of implanting a prosthetic device comprising:
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inserting a single-piece spacer between a superior vertebra and an adjacent inferior vertebra;
the spacer comprising;a posterior portion comprising; first and second spinous-process receiving notches; first, second, third, and fourth flanges;
the first and second flanges forming the first notch;
the third and fourth flanges forming the second notch oriented generally opposite the first notch;a substantially planar posterior face; an intermediate section on the posterior face abutting the first, second, third, and fourth flanges;
the intermediate section separating the first notch from the second notch;
the intermediate section not extending more posteriorly than the first and second flanges;an anterior portion having a fifth flange forming a first groove with the first flange, the first groove forming an upwardly facing concave surface; the anterior portion having a sixth flange forming a second groove with the third and forth flanges; the first notch and first groove each having respective minimum points; wherein the spacer is monolithically formed; receiving a spinous process of the superior vertebra in the first notch and receiving a portion of the inferior vertebra in the second notch such that the first and second notches extend through a sagittal plane defined by the superior and inferior vertebrae; receiving a portion of a ridge of the inferior vertebra into the second groove; wherein the anterior portion is disposed more anteriorly than the posterior portion; wherein after the receiving steps and when the spacer is viewed normal to the sagittal plane, the minimum point of the first groove is disposed along an upper perimeter profile of the spacer at a point closest to the center of the spacer and the minimum point of the first groove is positioned vertically above the minimum point of the first notch. - View Dependent Claims (18, 19)
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Specification