Crush Resistance – Parallel Plates
The goal of the test is to determine the load required to cause clinically relevant buckling or a deflection equivalent to a diameter reduction of at least 50%, and determine the load and the displacement required to permanently deform or fully collapse the stent. The purpose of the test is to also determine whether the stent recovers from its original geometry after testing.
Samples are tested for crush between two parallel plates. A compression testing system and a specific software are used to measure both the loading force on the sample and the displacement while decreasing the distance between the two parallel plates on which the sample is placed. The distance between the parallel plates is adjusted to a known distance using a calibrated dimensional gauge and then the distance is increased to a value superior to sample diameter. A sample is placed on the support plate in the orientation anticipated to have the least amount of crush resistance. The sample is compressed using a uniform rate of compression until final distance value defined is reached. Load and displacement are continuously recorded during cycles.
A physiological temperature of 37°C can be used for thermo-sensitive material
Tank with thermal regulation system
Automatic compression system with parallel plates system including:
– Calibrated dynamometer
– Stepping motor
Calibrated gauge block
Balloon expandable stents
Self expanding stents
Cardiovascular implants — Endovascular devices — Part 2: Vascular stents
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