Abstract
Off-pump CABG surgery requires high level of techniques. The surgeon must complete the anastomosis of two millimeter wide arteries within ten minutes on beating condition. Due to its difficulty, an effective training platform of DRY LAB with assessments is in strong need. This study investigated the models of anastomosis configurations and a relationship between the model and the energy loss (EL) using a beating heart simulator (BEAT, EBM) and coronary artery model (YOUCAN, EBM) which were developed from this research. The models for the analysis were chosen based on the actual EL; low (X: 42 μW), medium (Y: 196 μW) and high (Z: 362 μW) values. The effective cross-sectional areas were set by taking the cross-sectional areas from the mainstreams. The calculated EL was calculated using Hagen-Poiseuille because energy loss is inversely proportional to the square of the minimum effective cross-sectional area in a Hagen-Poiseuille flow. Results indicated that the change of the velocity distribution of the area in Y and Z were greater than those in X. The minimum effective cross-sectional areas were 2.1 mm^2 (X), 1.2 mm^2 (Y), 0.8 mm^2 (Z). Therefore, it was confirmed that mainstream could not utilize the anastomosis configuration efficiently in Y and Z. In addition, it was found that the calculated EL and the actual EL had a strong correlation, and the minimum effective cross-sectional area influenced the actual EL strongly.
