Abstract: An orthopedic simulator is provided with an integral central manifold that provides internal routing of pressurized hydraulic fluid, compressed air, or electrical power to the actuators of the orthopedic simulator. The integral manifold is structurally coupled to support elements and resist and transfer bending and shear forces to the support elements.

Abstract: An orthopedic simulator is provided with a plurality of test stations for each holding a test specimen. A plurality of load actuators are provided, with a respective load actuator for each of the test stations. The load actuators are substantially frictionless and configured to apply loads to the test specimens at the test stations.

Abstract: An orthopedic simulator is provided with an orthopedic simulator having at least one test station with a specimen container for containing a fluid bath, such as bovine fluid. A fluid level sensor is positioned to sense the level of fluid in the fluid bath and generate a fluid level signal. A fill controller is coupled to the fluid level sensor. The fill controller controls filling of the fluid bath with liquid, such as distilled water, as a function of the fluid level signal to restore and maintain the concentration of the bath.

Abstract: An orthopedic simulator is provided with a mechanism with a plurality of sub-mechanisms that generate relative motions between the portions of orthopedic devices, such as spinal disc implants. The sub-mechanisms are configured to be nested so as to place the sub-mechanism with the highest required performance closest to the specimen.

Abstract: A test specimen holder for holding a test specimen in a material testing machine includes a base member having a piston chamber, a valve chamber fluidly coupled to the piston chamber, a port fluidly coupled to the valve chamber and an end couplable to a material testing machine. A piston is movable relative to the piston chamber. A pair of first and second jaw assemblies are supported by the base members so as to be opposite each other. The jaw assemblies are operably coupled to the piston. A valve is disposed in the valve chamber and a valve stem is coupled to the valve. The valve stem is supported by the base member and is twistable to operate the valve. A user operable knob is coupled to the valve stem.

Abstract: A test specimen holder for holding a test specimen in a material testing machine includes a base member having a piston chamber, a valve chamber fluidly coupled to the piston chamber, a port fluidly coupled to the valve chamber and an end couplable to a material testing machine. A piston is movable relative to the piston chamber. A pair of first and second jaw assemblies are supported by the base members so as to be opposite each other. The jaw assemblies are operably coupled to the piston. A valve is disposed in the valve chamber and a valve stem is coupled to the valve. The valve stem is supported by the base member and is twistable to operate the valve. A user operable knob is coupled to the valve stem.