Spinal intervertebral implant, interconnections for such implant and processes for making
First Claim
1. A spinal fusion implant for fusing together two adjacent vertebra comprising:
- a first member having first and second opposing sides and a first bore defining a first central longitudinal axis, the first bore being in communication with at least the first side;
a second member having third and fourth opposing sides and a second bore in communication with at least the third side, the second bore defining a second central longitudinal axis, the first and second axes forming a first pair; and
an elongated first pin located in the first and second bores for securing the first member to the second member at the interface formed by the facing first and third respective sides to thereby form said spinal fusion implant, the pin having first and second sections and at least one first outermost peripheral surface defining a first transverse dimension therebetween at the first section defining a third central longitudinal axis, the pin having at least one second outermost peripheral surface defining a second transverse dimension therebetween at the second section defining a fourth central longitudinal axis, the third and fourth axes forming a second pair;
one axis of at least one of the first and second pair of axes being offset relative to the other axis of the at least one pair of axes so as to place the pin in relative compression and tension in the first and second bores for providing a compressive load on the surface of the first and second bores to frictionally secure the members together.
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Accused Products
Abstract
A cortical bone implant is formed of two or more planks of bone which are connected with one or more offset pins. The pins may be right circular cylinders inserted into a corresponding offset bore which offset bends the inserted pin. The bending creates compression and tensile loads in the pin which loads creates friction compression forces on the planks connecting them to the pins by friction. The pins may have different shapes to form the offsets and different configurations for friction attachment to the planks. The implants may be formed of flat or L-shaped planks or bones formed into other shapes including interlocking arrangements. Processes and fixtures are disclosed for forming the pins, planks and implants. Various embodiments of the pins, planks, implants and processes are disclosed.
352 Citations
28 Claims
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1. A spinal fusion implant for fusing together two adjacent vertebra comprising:
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a first member having first and second opposing sides and a first bore defining a first central longitudinal axis, the first bore being in communication with at least the first side;
a second member having third and fourth opposing sides and a second bore in communication with at least the third side, the second bore defining a second central longitudinal axis, the first and second axes forming a first pair; and
an elongated first pin located in the first and second bores for securing the first member to the second member at the interface formed by the facing first and third respective sides to thereby form said spinal fusion implant, the pin having first and second sections and at least one first outermost peripheral surface defining a first transverse dimension therebetween at the first section defining a third central longitudinal axis, the pin having at least one second outermost peripheral surface defining a second transverse dimension therebetween at the second section defining a fourth central longitudinal axis, the third and fourth axes forming a second pair;
one axis of at least one of the first and second pair of axes being offset relative to the other axis of the at least one pair of axes so as to place the pin in relative compression and tension in the first and second bores for providing a compressive load on the surface of the first and second bores to frictionally secure the members together. - 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)
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25. A cortical bone implant comprising:
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a first cortical bone member having a first bore;
a second cortical bone member having a second bore; and
a connecting pin having a longitudinal axis and one or more outermost peripheral surfaces, the pin being attached to each member in said bores, the pin having first and second longitudinally spaced portions each defining a transverse dimension to and between the pin one or more outer peripheral surfaces, the spaced portions defining first and second axis portions of the pin longitudinal pin axis;
said first and second bores forming a first pair and said first and second axis portions forming a second pair, one of said first and second bores being offset relative to the other of said first and second bores or one of said first and second portions being offset relative to the other of said first and second portions for placing the pin in both compression and tension to frictionally hold the pin to the members and the members together. - View Dependent Claims (26)
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27. A cortical bone implant comprising:
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a first cortical bone member;
a second cortical bone member abutting the first member, each member having a respective pin receiving bore having corresponding first and second internal transverse dimensions defining a corresponding first and second longitudinal axis; and
an elongated pin defining longitudinally spaced first and second sections each having an outermost peripheral surface defining respective third and fourth longitudinal axes and having corresponding respective first and second transverse dimensions to and between the outermost peripheral surface, the pin being in each member bore for attaching the members to each other, one of the pin and bores respective third and first longitudinal axis being offset relative to the respective fourth and second longitudinal axis to place the pin in both compression and tension. - View Dependent Claims (28)
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Specification