Numerical Methodology to Evaluate Trackability and Pushability of PTCA Balloon Catheter

Area of Science:

• Biomedical Engineering
• Medical Device Design
• Computational Mechanics

Background:

• Percutaneous coronary intervention (PCI) requires precise catheter navigation to avoid vessel injury.
• Catheter trackability and pushability are key performance indicators influenced by device design and vessel anatomy.
• Existing methods for evaluating catheter navigation may not fully capture complex interactions.

Purpose of the Study:

• To develop a validated numerical model for analyzing percutaneous transluminal coronary angioplasty (PTCA) catheter navigation.
• To investigate the influence of catheter design parameters on navigation performance.
• To provide a tool for optimizing PTCA balloon catheter design.

Main Methods:

• Finite element analysis (FEA) was employed to model PTCA catheter navigation.
• The model incorporated vessel geometry, contact interactions (catheter, guidewire, vessel), and friction.
• Numerical results were validated against in vitro experimental data.

Main Results:

• Contact interactions and friction coefficients between the guidewire and catheter significantly impact numerical accuracy.
• Distal shaft diameter positively correlates with pushability and weakly with trackability force.
• Proximal shaft diameter strongly correlates with trackability force and inversely with pushability.

Conclusions:

• The presented numerical methodology offers a preliminary simulation of PTCA balloon catheter behavior.
• This approach can guide the design and optimization of PTCA balloon catheters and similar devices.
• Improved deliverability of interventional devices can be achieved through simulation-based design.