ASTM F describes the procedure for testing subassemblies and interconnection mechanisms to determine the fatigue strength and. ASTM F Static and Fatigue Properties of Interconnection Mechanisms and Subassemblies Used in Spinal Arthrodesis Implants. Purchase your copy of ASTM F – 13 as a PDF download or hard copy directly from the official BSI Shop. All BSI British Standards available.
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Accreditation certificate arrived We offer various test methods for the mechanical characterization of partial constructions of spinal implants according to ASTM F A substructure consists of an element for the connection to a vertebral body hook or screw and a longitudinally proceeding element rod or platewhich are connected to one another via a connecting mechanism.
Within the scope of the test, loads and moments are applied in three directions corresponding to a vertebral body: From the following range, we will asm the appropriate test procedures for the partial constructs of your individual spinal implants:.
From the following range, we will select the appropriate test procedures for the partial constructs of your individual spinal implants: Static test methods 1.
Anterior-posterior and lateral loading: The longitudinally proceeding component is firmly clamped in the test device and a load max. The force-displacement curves are recorded and evaluated with regard to the mechanical properties including stiffness and strength.
In this test, the connection stability between the connecting element and the longitudinal element is determined. One side of the longitudinal element is firmly clamped while the other side remains free. A force-displacement curve reveals a significant drop in force, which marks the exceeding of the connection strength.
Wirbelsäulenimplantate – Verbindungs- und Teilkonstrukte ASTM F
Flexion extension and transversal moment: The longitudinal component is firmly clamped in the test device and a load max.
The connecting element serves as a lever arm, so that a moment about the x- or y-axis is generated.
In this test, the connection stability between xstm connecting element and the longitudinal element is determined under torsion. A moment-angle curve can be used to determine a significant drop in the torque, which marks the exceeding of the connection strength.
Dynamic test methods Following the static tests, the tests with new test specimens are performed dynamically over 2. If the partial construct fails before reaching the 2.
Following the dynamic tests, the axial joint strength is tested under torsion to determine residual stability.