Allograft implant
First Claim
Patent Images
1. A multipiece implant comprising:
- a body having a superior surface, an inferior surface and a surface extending from the superior surface to the inferior surface, the body further including a central opening extending from the superior surface to the inferior surface for receiving one of osteogenic, osteoconductive or osteoinductive material;
the body being formed from at least first and second mating cortical bone segments, each segment having a locking surface configured to engage the locking surface of the other segment, each segment including at least a portion of the superior and inferior surfaces of the body and at least two passages, the first and the second cortical bone segments being arranged so that, when mated, the passages are in registry and have a common axis;
at least two cortical bone pins disposed within the passages;
wherein the locking surfaces of the first and second bone segments form dovetail joints, each of the dovetail joints including a mortise and a tenon, each of the passages passing through one of the mortises and tenons so that the cortical bone pins pass through one of the mortises and tenons;
and wherein the passages are configured so that the bone pins are positioned on opposite sides of the central opening.
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Accused Products
Abstract
An allogenic implant for use in intervertebral fusion is formed from one or more two pieces. The pieces are made from bone, and are joined together to form an implant having sufficient strength and stability to maintain a desired distance between first and second vertebrae in a spinal fusion procedure. The implant pieces may be formed of cortical bone and connected by dovetail joints, and at least one cortical bone pin may be provided to lock the pieces together and to add strength to the implant. Teeth are formed on the vertebra engaging surfaces of the implant prevent short-term slippage of the implant.
192 Citations
28 Claims
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1. A multipiece implant comprising:
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a body having a superior surface, an inferior surface and a surface extending from the superior surface to the inferior surface, the body further including a central opening extending from the superior surface to the inferior surface for receiving one of osteogenic, osteoconductive or osteoinductive material; the body being formed from at least first and second mating cortical bone segments, each segment having a locking surface configured to engage the locking surface of the other segment, each segment including at least a portion of the superior and inferior surfaces of the body and at least two passages, the first and the second cortical bone segments being arranged so that, when mated, the passages are in registry and have a common axis; at least two cortical bone pins disposed within the passages; wherein the locking surfaces of the first and second bone segments form dovetail joints, each of the dovetail joints including a mortise and a tenon, each of the passages passing through one of the mortises and tenons so that the cortical bone pins pass through one of the mortises and tenons; and wherein the passages are configured so that the bone pins are positioned on opposite sides of the central opening. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A multipiece intervertebral implant for implantation between first and second vertebrae, the implant comprising:
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a first segment constructed of cortical bone and having a first coupling portion; a second segment constructed of cortical bone and having second and third coupling portions; and a third segment constructed of cortical bone and having a fourth coupling portion; wherein the first and second segments are joined together by interfitting the first and second coupling portions and wherein the second and third segments are joined together by interfitting the third and fourth coupling portions to form a single body, the single body including a superior surface, an inferior surface and a surface extending from the superior surface to the inferior surface, the single body further including a central opening extending from the superior surface to the inferior surface; wherein the first and second coupling portions and the third and fourth coupling portions are dovetail joints, each of the dovetail joints including a corresponding mortise and tenon; and wherein each bone segment forms at least a portion of the superior surface and at least a portion of the inferior surface; and wherein the single body includes a first bore extending at least partially through each of the first, second, and third bone segments and a second bore extending at least partially through each of the first, second, and third bone segments, the first and second bores being configured to receive first and second bone pins, respectively, the first and second bone pins being arranged so that the first and second bone pins do not intersect the central opening;
the first bone pin positioned on one side of the central opening and the second bone pin positioned on an opposite side of the central opening, each of the first and second bone pins passing through one of the mortises and tenons. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification