As a result of comminuted fractures of a vertebral body or tumors in the area of the spinal column it may be necessary to replace a vertebral body with an implant. These vertebral body implants are tested by carrying out quasi-static and oscillating torsion tests in accordance with ASTM F 2077 and ASTM F 1717.
The test device is designed for static and alternating torsion tests. The maximum rotation angle is 120° for static tests and ±20° for oscillating tests. The low-play guide rails allow specimens of varying lengths to be clamped and tested to ASTM F 2077 and ASTM F 1717.
The device is also suitable for expulsion tests. Here the expulsion force is determined by positioning the implant between two suitably machined blocks and applying a defined axial pre-load.
A transverse load, which determines the expulsion strength, is then applied to the implant by a testing actuator via a compression die until the implant is expelled. The maximum force determined defines the expulsion force.
The Amsler HC Compact dynamic testing machine features compact design and extremely low noise, providing an optimum solution to testing vertebral body replacements in any laboratory when used in conjunction with the test device for torsion tests on vertebral bodies.
|Zwick Ibérica Equipos de Ensayos S.L.|
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