Arcuate artificial hemi-lumbar interbody spinal fusion implant having an asymmetrical leading end
First Claim
1. An artificial interbody spinal implant for linear insertion at least in part across the height of a disc space between adjacent vertebral bodies of a human spine, the vertebral bodies having an anterior aspect and a posterior aspect, said implant comprising:
- a leading end for insertion first into the disc space, a trailing end opposite said leading end, and therebetween a length along a mid-longitudinal axis of said implant, said implant being non-threaded and adapted for linear insertion in a direction along the mid-longitudinal axis of said implant, said leading end being asymmetrical, less than half of said asymmetric leading end being along a line perpendicular to the mid-longitudinal axis of said implant in a plane dividing said implant into an upper half and a lower half;
opposed portions between said leading and trailing ends adapted to be placed at least in part within the disc space to contact and support the adjacent vertebral bodies, said opposed portions each having an arcuate portion, said arcuate portions being arcs of the same circle, said opposed portions being spaced apart to have a height greater than the restored height of the disc space, said implant being formed at least in part of a material other than bone, said material comprising at least one of surgical quality titanium and its alloys, cobalt chrome alloy, tantalum, any metal or alloy suitable for the intended purpose, any ceramic material suitable for the intended purpose, and any plastic or composite material suitable for the intended purpose;
an interior facing side wall, an exterior facing side wall opposite said interior side wall, and a width therebetween, said width of said implant being less than approximately one-half of the maximum width of the adjacent vertebral bodies into which said implant is adapted to be inserted, said interior and exterior side walls being between said opposed portions and said leading and trailing ends, said interior side wall adapted to be oriented toward another implant when inserted within the disc space;
a first distance as measured from said leading end to a plane perpendicular to and bisecting the length along the mid-longitudinal axis of said implant that is greater than a second distance as measured from said perpendicular plane to the junction of said leading end and said exterior side wall; and
a third distance as measured from the junction of said leading end and said interior side wall to said perpendicular plane that is greater than said second distance, said first distance being less than said third distance.
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Accused Products
Abstract
An artificial interbody spinal implant adapted for placement across an intervertebral space formed across the height of a disc space between two adjacent vertebral bodies is disclosed. The implant has an asymmetrical leading end adapted to sit upon the more peripheral areas, such as the apophyseal rim and the apophyseal rim area, of the vertebral end plate region of the vertebral bodies without protruding therefrom. The asymmetrical leading end allows for the safe use of an implant of maximum length for the implantation space into which it is installed. The implant can also include an asymmetric trailing end adapted to sit upon the more peripheral areas of the vertebral end plate region of the vertebral bodies.
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Citations
64 Claims
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1. An artificial interbody spinal implant for linear insertion at least in part across the height of a disc space between adjacent vertebral bodies of a human spine, the vertebral bodies having an anterior aspect and a posterior aspect, said implant comprising:
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a leading end for insertion first into the disc space, a trailing end opposite said leading end, and therebetween a length along a mid-longitudinal axis of said implant, said implant being non-threaded and adapted for linear insertion in a direction along the mid-longitudinal axis of said implant, said leading end being asymmetrical, less than half of said asymmetric leading end being along a line perpendicular to the mid-longitudinal axis of said implant in a plane dividing said implant into an upper half and a lower half; opposed portions between said leading and trailing ends adapted to be placed at least in part within the disc space to contact and support the adjacent vertebral bodies, said opposed portions each having an arcuate portion, said arcuate portions being arcs of the same circle, said opposed portions being spaced apart to have a height greater than the restored height of the disc space, said implant being formed at least in part of a material other than bone, said material comprising at least one of surgical quality titanium and its alloys, cobalt chrome alloy, tantalum, any metal or alloy suitable for the intended purpose, any ceramic material suitable for the intended purpose, and any plastic or composite material suitable for the intended purpose; an interior facing side wall, an exterior facing side wall opposite said interior side wall, and a width therebetween, said width of said implant being less than approximately one-half of the maximum width of the adjacent vertebral bodies into which said implant is adapted to be inserted, said interior and exterior side walls being between said opposed portions and said leading and trailing ends, said interior side wall adapted to be oriented toward another implant when inserted within the disc space; a first distance as measured from said leading end to a plane perpendicular to and bisecting the length along the mid-longitudinal axis of said implant that is greater than a second distance as measured from said perpendicular plane to the junction of said leading end and said exterior side wall; and a third distance as measured from the junction of said leading end and said interior side wall to said perpendicular plane that is greater than said second distance, said first distance being less than said third distance. - 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, 37, 38, 39, 40, 41, 42, 43, 44)
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45. An artificial interbody spinal implant for linear insertion at least in part across the height of a disc space between adjacent vertebral bodies of a human spine, the vertebral bodies having an anterior aspect and a posterior aspect, said implant comprising:
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a leading end for insertion first into the disc space, a trailing end opposite said leading end, and therebetween a length along a mid-longitudinal axis of said implant, said implant being non-threaded and adapted for linear insertion in a direction along the mid-longitudinal axis of said implant, said leading end being asymmetrical, less than half of said asymmetric leading end being along a line perpendicular to the mid-longitudinal axis of said implant in a plane dividing said implant into an upper half and a lower half; opposed portions between said leading and trailing ends adapted to be placed at least in part within the disc space to contact and support the adjacent vertebral bodies, said opposed portions each having an arcuate portion, said arcuate portions having the same radius of curvature, said opposed portions being spaced apart to have a height greater than the restored height of the disc space, said opposed portions being angled relative to one another from said trailing end to said leading end to allow for angulation of the adjacent vertebral bodies relative to one another, said implant being formed at least in part of a material other than bone, said material comprising at least one of surgical quality titanium and its alloys, cobalt chrome alloy, tantalum, any metal or alloy suitable for the intended purpose, any ceramic material suitable for the intended purpose, and any plastic or composite material suitable for the intended purpose; an interior facing side wall, an exterior facing side wall opposite said interior side wall, and a width therebetween, said width of said implant being less than approximately one-half of the maximum width of the adjacent vertebral bodies into which said implant is adapted to be inserted, said interior and exterior side walls being between said opposed portions and said leading and trailing ends, said interior side wall adapted to be oriented toward another implant when inserted within the disc space; a first distance as measured from said leading end to a plane perpendicular to and bisecting the length along the mid-longitudinal axis of said implant that is greater than a second distance as measured from said perpendicular plane to the junction of said leading end and said exterior side wall; and a third distance as measured from the junction of said leading end and said interior side wall to said perpendicular plane that is greater than said second distance. - View Dependent Claims (46, 47, 48, 49, 50, 51, 52)
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53. An artificial interbody spinal implant for linear insertion at least in part across the height of a disc space between adjacent vertebral bodies of a human spine, the vertebral bodies having an anterior aspect and a posterior aspect, said implant comprising:
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a leading end for insertion first into the disc space, a trailing end opposite said leading end, and therebetween a length along a mid-longitudinal axis of said implant, said implant being non-threaded and adapted for linear insertion in a direction along the mid-longitudinal axis of said implant, said leading end being asymmetrical, less than half of said asymmetric leading end being along a line perpendicular to the mid-longitudinal axis of said implant in a plane dividing said implant into an upper half and a lower half; opposed portions between said leading and trailing ends adapted to be placed at least in part within the disc space to contact and support the adjacent vertebral bodies, said opposed portions each having an arcuate portion, said arcuate portions being arcs of the same circle, said opposed portions being spaced apart to have a height greater than the restored height of the disc space, said implant being formed at least in part of a material other than bone, said material comprising at least one of surgical quality titanium and its alloys, cobalt chrome alloy, tantalum, any metal or alloy suitable for the intended purpose, any ceramic material suitable for the intended purpose, and any plastic or composite material suitable for the intended purpose; an interior facing side wall, an exterior facing side wall opposite said interior side wall, and a width therebetween, said width of said implant being less than approximately one-half of the maximum width of the adjacent vertebral bodies into which said implant is adapted to be inserted, said interior and exterior side walls being between said opposed portions and said leading and trailing ends, said interior side wall adapted to be oriented toward another implant when inserted within the disc space; a first distance as measured from said leading end to a plane perpendicular to and bisecting the length along the mid-longitudinal axis of said implant that is greater than a second distance as measured from said perpendicular plane to the junction of said leading end and said exterior side wall; a third distance as measured from the junction of said leading end and said interior side wall to said perpendicular plane that is greater than said second distance; and a plurality of openings and passages for retaining fusion promoting substance. - View Dependent Claims (54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64)
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Specification