(Table 5)
In one case, the ASO was implanted successfully in the second try because of its large round shape. The maximal diameter, the minimum diameter and circumference measured from the 3D printed ASD model was 22.62mm, 20.67mm, 71.19mm, respectively. The circular index defined as the ratio of its maximal to minimal diameters was 1.1(<1.4). According to the principle of conventional clinical selection of the ASD device size, a 28mm ASO was delivered into the ASD model, however the occluder is so small that result in residual leak. As a result, a 32mm ASO was selected in the second attempt, the model-matched occluder was placed in 3D printed ASD model successfully with the waist of occluder slightly compressed and the double-discs paralleled with the ASD plane