US 6,855,167 B2Granted

Spinal intervertebral implant, interconnections for such implant and processes for making

AssigneeOsteotech, Inc.

InventorsLawrence A. Shimp, John M. Winterbottom, David R. Kaes, Todd M. Boyce, Erik O. Martz

Life of this patent

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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.

Claims28

Dependent claims

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.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/005,238Filed 5 Dec 2001
Published: US 2003/0105528 A15 Jun 2003
Granted: 15 Feb 2005
Term ends: Not estimatedThe source records don’t support an estimate.

Classification41 codes

A61F 2/4455
For the spine, e.g. vertebrae or spinal discs: for the fusion of spinal bodies, e.g. intervertebral fusion of adjacent spinal bodies, e.g. fusion…
A61F 2/28
Prostheses implantable into the body: bones
A61F 2/4611
For insertion or extraction of endoprosthetic joints or of accessories thereof: of spinal prostheses
A61F 2002/30009
The prosthesis being made from materials having different values of a given property at different locations within the same prosthesis: differing…