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Related Experiment Video

Updated: Jun 10, 2025

Experimental Investigation of Secondary Flow Structures Downstream of a Model Type IV Stent Failure in a 180° Curved Artery Test Section

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Published on: July 19, 2016

Swirling Flow Quantification in Helical Stents Using Ultrasound Velocimetry.

Ashkan Ghanbarzadeh-Dagheyan^1,2,3, Majorie van Helvert^1,4, Lennart van de Velde^1,4

¹Multi-Modality Medical Imaging, Technical Medical (TechMed) Centre, University of Twente, Enschede, The Netherlands.

Journal of Endovascular Therapy : an Official Journal of the International Society of Endovascular Specialists

|October 14, 2024

Summary

This summary is machine-generated.

Helical stents create swirling blood flow in the superficial femoral artery (SFA), indicated by more complex flow fields and skewed velocity profiles. Further research will determine if this improves patient outcomes for peripheral arterial disease (PAD).

Keywords:

blood flow imaging echoPIV helical stents high-frame-rate ultrasound ultrasound velocimetry

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Last Updated: Jun 10, 2025

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Published on: July 19, 2016

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Published on: December 19, 2013

Area of Science:

Biomedical Engineering
Fluid Dynamics
Medical Device Technology

Background:

Peripheral arterial disease (PAD) affects the superficial femoral artery (SFA).
Helical stents are designed to promote swirling blood flow, potentially improving SFA treatment.
Quantifying flow signatures is crucial to validate the efficacy of helical stent geometry.

Purpose of the Study:

To provide evidence for the existence of swirling flow induced by helical stents.
To quantify the flow signatures associated with helical stent implantation in the SFA.

Main Methods:

In vitro fabrication and flow assessment of helical and straight stent models.
In vivo analysis of a helical stent in a patient's SFA across different leg postures.
High-frame-rate ultrasound with microbubbles and echoPIV for velocity vector field extraction.

Main Results:

Helical stents exhibited more complex flow vector fields and skewed velocity profiles at the outlet compared to the inlet.
In vivo data showed increased flow complexity and variability in velocity profile skewedness within the helical stent.
These findings indicate alterations in blood flow patterns attributable to the helical stent's geometry.

Conclusions:

Helical stent models demonstrably alter blood flow dynamics, generating more complex flow and skewed velocity profiles.
These flow characteristics serve as signatures indicative of swirling flow within helical stents.
Further population-based studies are necessary to ascertain potential clinical benefits, such as improved patency rates, for patients treated with helical stents.