Posted on: January 4, 2018

SABER DEVELOPS A MACHINE FOR TESTING DURABILITY OF CORONARY STENTS

Description

The Coronary Stent Bending Fatigue Tester is a piece of benchtop equipment used to perform bending durability testing on expanded coronary stents by applying a specific bending deflection.  The bending deflection is adjustable and specified by the minimum and maximum deflection angle and/or the minimum and maximum radius of curvature.  The test sample shall consist of an expanded stent or pair of overlapped expanded stents deployed inside a transparent tubing or “mock vessel”.

Features

  • Adjust and verify the maximum and minimum bend angle prior to initiation of testing.  Bend angles range between 0º (C shape) and 180º (straight line) with a tolerance of ± 1º.
  • Adjust and verify the maximum and minimum bend radius of curvature prior to initiation of testing.  Bend radius of curvatures range between 10 mm and 50mm (a straight line) with a tolerance of ± 0.5 mm.
  • Specify the cycle speed (test frequency) within the range of 0 Hz to 60 Hz.
  • Test samples deployed in a mock vessel with phosphate buffered saline (PBS) flowing through the vessel. PBS flow rate shall be adjustable between 20 mL/min and 100 mL/min.
  • Maintain a constant temperature at the test specimen.  Temperature shall be set between 30 and 45 ºC with a tolerance of 1ºC
  • Accommodate stents with a range of diameters from 2.0 mm ID to 10.0 mm ID.  Corresponding tubing OD ranges from 2.0 mm to 15.0 mm.
  • Accommodate stents with a range of lengths from 8 mm to 150 mm.
  • Test samples at an accelerated frequency and maintain bend and angle tolerances over a life of more than 200 billion cycles.

Hardware Overview

  • Custom Design and Fabrication of Frame and Shielding
  • Linear and Rotary Stages
  • Saline Flow and Temperature Control System
  • HMI Components
  • Push Button, Electrical, and E-Stop Components
  • Power Distribution Components
  • Motion Control Components

Software Overview

  • Motion Control Development
  • HMI Development and Integration