Steady Flow Testing – Stent Post Deflection

The deflection of the stent lateral struts (post) is measured when subjected to different back-pressures.

Test Procedure

When a prosthetic cardiac valve is closed due to an adverse pressure, some fluid is flowing back through the valve. The volume of fluid coming back during this phase will have to be compensated by an increase of ejection volume of the heart. The higher the back-flow, the higher the energy the heart has to provide to produce a supplementary forward flow.  The study aims to characterize static leakage flow across the valves when subjected to different back pressures following ISO 5840 requirements.


  • Surgical Valves: SAVR, SMVR, SPVR, STVR
  • Transcatheter Valves: TAVI / TAVR, TMVI / TMVR, TPVI / TPVRTMVR, TTVR / TTVI  and any other transcatheter valve
  • Biological, Polymeric, mechanical valves, tissue engineered
  • Artificial heart valves prosthesis
  • Venous valves
  • Valvular conduits
  • Any valvular prosthesis
  • Any cardiac repair device

Service Levels

Applicable Standards

  • ISO 5840-3:2021
    Cardiovascular implants — Cardiac valve prostheses — Part 3: Heart valve substitutes implanted by transcatheter techniques

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