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<p>The growing demand for advanced medical catheters in minimally invasive surgery underscores the importance of optimizing catheter mechanical properties. Although existing studies have explored various multilayer catheters made from different materials and composite designs, research on poly ether ether ketone (PEEK)-based double-layer catheters remains limited. This work developed a PAKD/PEBA double-layer medical catheter utilizing a combination of plasma surface modification and multi-step grafting. The approach enhanced the interlayer peel strength from 0&#xa0;N to 6.78&#xa0;N, meeting the bonding requirements for medical catheters. Moreover, compared to a single-layer PEEK catheter with the same dimensions, the bending stiffness of the PAKD/PEBA double-layer catheter was reduced by 39.65% and the torsional stiffness by 34.14%, resulting in improved flexibility and torsional resistance.</p>

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Plasma surface grafting of PEEK for enhanced mechanical properties in PAKD/PEBA double-layer medical catheters

  • 期刊论文

  • 发表日期：

    2026年2月19日

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  • Xiaobo Song,
  • Xinyi Liu,
  • Zongjing Mu,
  • Zhongbin Xu,
  • Cailiang Zhang

摘要

The growing demand for advanced medical catheters in minimally invasive surgery underscores the importance of optimizing catheter mechanical properties. Although existing studies have explored various multilayer catheters made from different materials and composite designs, research on poly ether ether ketone (PEEK)-based double-layer catheters remains limited. This work developed a PAKD/PEBA double-layer medical catheter utilizing a combination of plasma surface modification and multi-step grafting. The approach enhanced the interlayer peel strength from 0 N to 6.78 N, meeting the bonding requirements for medical catheters. Moreover, compared to a single-layer PEEK catheter with the same dimensions, the bending stiffness of the PAKD/PEBA double-layer catheter was reduced by 39.65% and the torsional stiffness by 34.14%, resulting in improved flexibility and torsional resistance.