Catheter steering in interventional cardiology: Mechanical analysis and novel solution

Area of Science:

• Biomedical Engineering
• Medical Devices
• Interventional Cardiology

Background:

• Mechanically actuated steerable catheters are widely used in cardiac interventions but face mechanical limitations.
• These limitations hinder precise navigation within the dynamic cardiac environment.

Purpose of the Study:

• To identify and analyze the limitations of existing mechanically steerable catheters.
• To design and develop a novel multi-steerable catheter prototype with improved steerability for complex cardiac procedures.

Main Methods:

• Mechanical analysis of existing steerable catheters to identify key limitations.
• Design and development of a novel multi-steerable catheter with four degrees of freedom.
• Proof-of-concept testing to evaluate steering functions and capabilities.

Main Results:

• Identified five key limitations: low torsion, shaft shortening, high friction, coupled tip-shaft movements, and the complex cardiac environment.
• Developed a multi-steerable catheter prototype with a dual-segmented tip, enabling complex motions like S-shaped curves and circular movements.
• Demonstrated high variability in tip direction and reliable bending angle repetition.

Conclusions:

• The novel multi-steerable catheter overcomes limitations of traditional designs, offering enhanced maneuverability for complex cardiac interventions.
• The four integrated degrees of freedom allow for precise, patient-specific navigation, potentially simplifying procedures.
• Further optimization and experimental validation are planned for future development.