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An Instrumented Pull Test to Characterize Postural Responses
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Estimating the "Pull" on a Pullthrough Wire: A Pilot Study.

Arindam Chaudhuri1,2, Frederic Heim2,3, Nabil Chakfe2

  • 1Bedfordshire-Milton Keynes Vascular Centre, Bedfordshire Hospitals NHS Foundation Trust, Bedford, UK.

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Summary
This summary is machine-generated.

Vascular surgeons applied an average tension of 3.9 kgf to hydrophilic wires, successfully stiffening them for device delivery in simulated aortic aneurysm repair. This quantified tension aids endovascular device tracking in complex anatomy.

Keywords:
EVAR/TEVARExperimental biomechanicsPullthrough wiresTortuous anatomyWire stiffnessWire tension characteristics

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Area of Science:

  • Endovascular Surgery
  • Medical Device Engineering
  • Biomechanical Analysis

Background:

  • Pullthrough wires are crucial for navigating complex aorto-iliac anatomy during endovascular aneurysm repair.
  • Current tensioning of these wires is subjective and lacks quantification.
  • This study addresses the need to quantify wire tension for improved device delivery.

Purpose of the Study:

  • To quantify the tension vascular surgeons apply to hydrophilic wires.
  • To determine if quantified tensioning can adequately stiffen wires for device tracking.
  • To assess the feasibility of device delivery using quantified wire tension in a simulated model.

Main Methods:

  • Thirteen vascular surgeons applied subjective tension to a hydrophilic wire connected to a scale.
  • The average applied tension was calculated.
  • A simulated aorto-iliac model was used to test device delivery over a wire tensioned to the average force.

Main Results:

  • The mean applied tension was 38.3 ± 14.8 N (3.9 kgf).
  • A 3.9 kgf tension successfully stiffened the wire in a simulated model.
  • A test device was successfully deployed in both brachiofemoral and femorofemoral configurations.

Conclusions:

  • A minimum tension of approximately 4 kgf can effectively stiffen floppy wires for device tracking in tortuous aorto-iliac anatomy.
  • This quantified tension provides a basis for successful endovascular device delivery.
  • Further research is needed to explore optimal tensioning parameters for various anatomical and device configurations.