A procedure to simulate coronary artery bypass graft surgery

Area of Science:

• Biomedical Engineering
• Computational Mechanics
• Vascular Surgery

Background:

• Coronary artery bypass graft (CABG) surgery can lead to intimal hyperplasia and graft failure due to tissue overstretching.
• Understanding the mechanical consequences of surgical parameters is crucial for improving graft patency.

Purpose of the Study:

• To develop a computational methodology for simulating CABG surgery.
• To analyze the effects of incision length and insertion angle on arterial and graft responses.

Main Methods:

• Utilized three-dimensional models of human coronary arteries and saphenous veins.
• Employed finite element analysis considering anisotropic, nonlinear vessel behavior, residual stresses, and anastomosis structure.
• Modeled the coronary artery as a three-layer thick-walled tube.

Main Results:

• Arterial incision variations significantly affect the arterial opening size, influenced by residual stresses.
• Incision length critically impacts graft shape and wall stress, with higher stresses at the heel region.
• Mechanical environment changes are severe at tissue transitions, with stress concentrations at incision ends.

Conclusions:

• The computational methodology provides insights into mechanical changes during CABG.
• Findings can inform the design of coronary anastomotic devices to reduce surgical trauma.
• This tool may enhance understanding of vascular diseases and aid in virtual surgical planning.