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

• Fast Track
• Standard Service
• Full Service

Applicable Standards

• ISO 25539-2:2020
  Cardiovascular implants — Endovascular devices — Part 2: Vascular stents

Related Tests

• Crush Resistance – Parallel Plates
• Crush Resistance – Pressure Control
• Recoil, Foreshortening

OLE1204