Design, Modeling, and Experimental Validation of an Active Microcatheter Driven by Shape Memory Effects

Area of Science:

• Biomedical Engineering
• Materials Science
• Medical Devices

Background:

• Active guidance microcatheters are crucial for cardiovascular and cerebrovascular interventions.
• Existing microcatheters face challenges in precise navigation and control during complex procedures.

Purpose of the Study:

• To propose and validate a novel microcatheter with a reconfigurable distal actuator for enhanced interventional surgery.
• To develop and verify a mathematical model for predicting the microcatheter's deformation and performance.

Main Methods:

• Fabrication of a microcatheter using shape memory alloy (SMA) wires embedded in a polyethylene (PE) base.
• Development of a mathematical model to predict the distal actuator's shape memory effect (SME) and thermal mismatch behavior.
• Structural optimization using the validated analytical model and experimental testing of prototypes.

Main Results:

• The mathematical model accurately predicted the distal actuator's deformation, aligning with finite element analysis and experimental results.
• Structural optimization led to feasible microcatheter designs.
• Experimental validation confirmed the reliability and accuracy of the prediction model and the mechanical feasibility of the designs.

Conclusions:

• The novel SMA-PE microcatheter offers a promising solution for active guidance in vascular interventions.
• The validated mathematical model provides a foundation for rapid development and optimization of active navigation strategies.
• This work paves the way for improved precision and efficiency in interventional surgeries.