Quantifying the Functional Stiffness of Pullthrough Wires Used for Endovascular Aneurysm Repairs Using Comparative...

Area of Science:

• Vascular Surgery
• Medical Device Engineering
• Biomedical Materials Science

Background:

• Limited research exists on guidewire stiffness in endovascular procedures, especially for abdominal/thoracic endovascular aneurysm repair.
• Tensioned pullthrough wires are utilized, but their functional stiffness remains unquantified.
• Understanding guidewire mechanics is vital for optimizing device delivery and procedural success.

Purpose of the Study:

• To compare the radial stiffness of pullthrough guidewires against standard stiff guidewires.
• To quantify the effective stiffness of tensioned pullthrough wires.
• To elucidate the mechanical properties influencing device delivery in endovascular repair.

Main Methods:

• Compared two stiff guidewires (Lunderquist, Amplatz) and one floppy guidewire (Radifocus) in standard and pullthrough configurations.
• Measured radial stiffness using peak deformation force (PDF) on an electromechanical dynamometer.
• Performed statistical analysis on data from three experimental runs per wire type and configuration.

Main Results:

• The pullthrough configuration of the Radifocus wire exhibited a significantly higher PDF (15.48 ± 0.33 N) compared to standard configurations.
• This pullthrough stiffness surpassed that of both Lunderquist (7.83 ± 0.23 N) and Amplatz (9.87 ± 0.92 N) stiff guidewires (p < .001).
• Standard configuration Radifocus wire showed a PDF of 7.84 ± 0.52 N.

Conclusions:

• Pullthrough guidewires demonstrate functionally superior rigidity compared to conventional stiff guidewires.
• This enhanced stiffness is essential for facilitating device deployment in endovascular interventions.
• The findings provide critical data for selecting appropriate guidewires in complex aortic procedures.