, Volume 57, Issue 8, pp 791–797 | Cite as

Stent-thrombus interaction and the influence of aspiration on mechanical thrombectomy: evaluation of different stent retrievers in a circulation model

  • Jawid Madjidyar
  • Julian Hermes
  • Sandra Freitag-Wolf
  • Olav Jansen
Interventional Neuroradiology



Different devices and techniques are available for endovascular treatment of ischemic stroke. In this in vitro study, we examined the stent-thrombus interaction and the influence of additional aspiration on the efficiency of mechanical thrombectomy with established stent retrievers.


Human blood thrombi were made in a Chandler loop. The thrombi were placed into the middle cerebral artery of a vascular silicon phantom. A programmable piston pump was used to acquire physiological flow in the model. Resistances were interposed to gain physiological pressure. The stent retrievers Trevo, Solitaire FR, Separator 3D, and Aperio were used to perform thrombectomy under direct visual control. For the additional aspiration, we used intermediate catheters.


Ten attempts per device were made with and without aspiration under standardized conditions, a total of n = 80. For all thrombectomy maneuvers, it was demonstrated that the thrombus was pushed by the stent struts against the vessel wall and was retracted along it. The stent-thrombus interaction was only superficial for all devices. Using additional distal aspiration, the amount of distal embolism and rate of embolism in new territories was significantly lower than without. Moreover, additional aspiration reduced the number of recanalization maneuvers and the recanalization time.


Distal aspiration with intermediate catheters increases the efficacy of mechanical thrombectomy with stent retrievers significantly. In contrary to earlier suggestions, the interaction between the thrombus and the stent retriever is only superficial, rather than an integration of the thrombus into the retriever. No significant differences between the proven devices could be shown in our model.


Thrombectomy Stent retriever Aspiration Circulation model Chandler loop 


Ethical standards and patient consent

We declare that all human and animal studies have been approved by our Ethics Committee and have therefore been performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments. We declare that patient consent was waived due to the fact blood was donated by investigators.

Conflict of interest

OJ consults Stryker (USA), Covidien (USA), Acandis (Germany) and Medtronic (USA). OJ speaks for Stryker (USA), Covidien (USA), Penumbra (USA), Philips (Netherlands), Boehringer (Germany) and Bayer (Germany).


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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Jawid Madjidyar
    • 1
  • Julian Hermes
    • 1
  • Sandra Freitag-Wolf
    • 2
  • Olav Jansen
    • 1
  1. 1.Department of Radiology and NeuroradiologyHospital Schleswig-Holstein (UKSH)KielGermany
  2. 2.Institute of Medical Informatics and StatisticsUniversity Hospital Schleswig-Holstein (UKSH)KielGermany

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