Direct Longitudinal Compression
The purpose of this test is to determine the deformation of the device in response to a compressive force applied longitudinally along axis of the device.
Test Procedure
The test sample is positioned on a specific vertical stent fixture. The sample stands vertically with its inferior extremity guided by a specific stent fixture. A piston, controlled by a stepper motor, is compressing the stent upper extremity at a fixed rate while measuring the compression force. The test stops either when the force reaches a specified force or the stent length reduction reaches 50%. At the end of the displacement, piston displacement and force are recorded. A video camera or a standard camera can be used to record the stent system behavior during the compression. Stent sample is removed from the fixture, sample final length and diameter are measured using an optical gauging machine and recorded.
Equipment
Automatic compression / traction system :
– Dynamometer
– Stepper motor
– DAQ
Calibrated Gauge blocks
Thermostatic chamber
Calibrated thermometer
Optical gauging machine
Measured Parameters
Time
Force
Distance
Scope
Balloon expandable stents
Self expanding stents
Service Levels
Applicable Standards
ISO 25539-2:2020
Cardiovascular implants — Endovascular devices — Part 2: Vascular stents
Related Tests
OLE1204
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