Degradable Alginate Hydrogel Intervention Catheters with Gradient Hardness in Length.

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Medical Device Engineering

Background:

• Interventional catheters require specific mechanical properties, including gradient hardness, for safe and effective use in diverse anatomical environments.
• Existing catheters may have limitations in flexibility and adaptability, potentially leading to tissue damage during procedures.
• Developing advanced catheter materials is crucial for improving patient outcomes and surgical efficiency.

Purpose of the Study:

• To report the first degradable hydrogel interventional catheter with gradient hardness.
• To develop a novel aqueous reaction methodology for fabricating such catheters.
• To evaluate the mechanical properties and anatomical adaptability of the developed hydrogel catheter.

Main Methods:

• Fabrication of a hollow hydrogel catheter from sodium alginate (SA) film via an aqueous reaction.
• Utilizing copper ion-induced asymmetric crosslinking followed by solvent exchange and ion removal.
• Implementing bimetallic crosslinking with CaCl2 and FeCl3 to achieve gradient hardness.
• Characterizing mechanical properties, including compressive strength, and assessing surface morphology.

Main Results:

• Successful fabrication of a degradable hydrogel interventional catheter with gradient hardness using a novel aqueous method.
• Achieved gradient robustness with mechanical strength ranging from 5.5 MPa (soft head) to 28 MPa (hard tail).
• The hydrogel catheter exhibited superior lubricity and flexibility without surface defects, demonstrating excellent anatomical adaptability.

Conclusions:

• The developed hydrogel interventional catheter with gradient hardness offers significant advantages over conventional devices.
• Its unique properties minimize tissue damage and facilitate surgical procedures, showing great potential for clinical applications.
• This study presents a promising new material and fabrication technique for advanced medical interventional devices.