Intervertebral disk arthroplasty
First Claim
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1. An intervertebral disk arthroplasty adapted to replace a disk between a first vertebra and a second vertebra in the spine, said arthroplasty comprising:
- a first member engaging the first vertebra having a first joint surface, a first posterior end and a first anterior end, said ends defining a transverse midline therebetween, said midline being equidistant from said first anterior end and said first posterior end;
a second member for engaging the second vertebra having a second joint surface facing said first joint surface, and second posterior and anterior ends juxtaposed with corresponding ends of said first posterior and anterior ends;
a ball and socket joint between said first and second members defined in said first and second joint surfaces and disposed between said midline and said first posterior end, said ball and socket joint configured to permit relative rotation between said first member and said second member about a first axis parallel to said transverse midline and a second axis perpendicular to said first axis and lying in a saggittal plane.
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Abstract
A prosthetic disk having ball and socket members made of a material having expected durability to function properly for 40 years in a typical lumbar spine. The disk is shaped to provide movement in 6 degrees of freedom mimicking normal intervertebral movement, except compression. The arthroplasty device is non-compressible to maintain distraction of the facet joints posteriorly. Base plates with tabs can be fastened to the ball and socket members to ensure short-term and long-term fixation, although it is expected not to be necessary.
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Citations
13 Claims
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1. An intervertebral disk arthroplasty adapted to replace a disk between a first vertebra and a second vertebra in the spine, said arthroplasty comprising:
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a first member engaging the first vertebra having a first joint surface, a first posterior end and a first anterior end, said ends defining a transverse midline therebetween, said midline being equidistant from said first anterior end and said first posterior end; a second member for engaging the second vertebra having a second joint surface facing said first joint surface, and second posterior and anterior ends juxtaposed with corresponding ends of said first posterior and anterior ends; a ball and socket joint between said first and second members defined in said first and second joint surfaces and disposed between said midline and said first posterior end, said ball and socket joint configured to permit relative rotation between said first member and said second member about a first axis parallel to said transverse midline and a second axis perpendicular to said first axis and lying in a saggittal plane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An intervertebral disk arthroplasty for a space created by a disk resected from between a first vertebra and a second vertebra, comprising:
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a first member having a first side adapted to be placed adjacent the first vertebra, said first member also having a side opposite said first side which includes an elongated socket formed therein, said side opposite said first side all around said socket being inclined away from said socket toward said first side; a second member having a second side adapted to be placed adjacent the second vertebra, said second member also having a side opposite said second side which includes an elongated ball formed therein, said side opposite said second side all around said ball being inclined away from said ball toward said second side, said ball fitting loosely in said socket.
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13. An intervertebral disk arthroplasty adapted to replace a disk between a first vertebra and a second vertebra in the spine, said arthroplasty comprising:
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a first member having a first surface for engaging the first vertebra, an opposite first joint surface, a first posterior end and a first anterior end, said ends defining a transverse midline therebetween said midline being equidistant from from said first anterior end and said posterior end; a second member having a second surface for engaging the second vertebra, an opposite second joint surface facing said first joint surface, and second posterior and anterior end juxtaposed with corresponding ones of said first posterior and anterior ends; a joint between said first and second members to permit relative rotation between said first member and said second member about a first axis parallel to said transverse midline and a second axis perpendicular to said first axis, said joint including; a ball portion defined in said first joint surface of said first member, said ball portion having a partially cylindrical cross-section along an axis parallel to said transverse midline terminating in opposite end faces that are sloped toward said first joint surface; and a socket portion defined in said second joint surface substantially complementary to said ball portion in said first joint surface and configured to loosely receive said ball portion therein.
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Specification