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Duan, et al.
A B

C D

E F

Figure 5. A single-level linear model of G-C, TD, and LD of age and weight. (A) The single-level linear model of G-C of age. (B) The
single-level linear model of TD of age. (C) The single-level linear model of LD of age. (D) The single-level linear model of G-C of weight.
(E) The single-level linear model of TD of weight. (F) The single-level linear model of LD of the weight. Abbreviations: G-C, distance from
glottis to carina; TD, transverse diameter; LD, longitudinal diameter.

Table 1. Multivariate analysis of sex, age, and weight of the patient as well as G-C, TD and LD
Dependent variable Independent variable Coefficient LogWorth P R 2 Adjusted R 2 RMSE
G-C* (mm) 0.47 0.46 5.78
Sex 1.06 1.23 0.059
Age (day) 0.05 6.48 0.000**
Weight (kg) 0.11 0.13 0.734
TD* (mm) 0.23 0.22 0.79
Sex 0.14 1.202 0.06286
Age (day) 0.00 1.779 0.01662*
Weight (kg) 0.03 0.37 0.42661
LD* (mm) 0.19 0.17 0.62
Sex 0.05 0.646 0.3772
Age (day) 0.00 1.117 0.0763
Weight (kg) 0.04 0.423 0.2257
G-C*, distance from glottis to carina (mm); TD* (transverse diameter), to match up with the diameter of the right main bronchus (mm); LD* (longitudinal
diameter), to match up with distance from the upper margin of the right upper lobe opening to carina (mm). *P<0.05, **P<0.01

3.5. Verification of blocking effect of the trial- simulating the situation of the right lung isolation during
produced sample of BB infants only in the thoracoscopic surgery in infants. After inflation of cuff,
concave 3D printing model ink was added into the concave 3D printed bronchial
model to observe whether there was a serious leakage
The concave 3D printed models were used to verify of the inflatable cuff and whether it blocked the RUL
the blocking validity of the trial-produced sample. The opening at 0, 15, 30, 60, and 120 min. The experiment
inflatable cuff of BB was placed between the opening demonstrated no visible leakage at 15 min, and slight
of the RUL of the right main bronchus and the carina, leakage at 30, 60, and 120 min. A silk thread through the

International Journal of Bioprinting (2022)–Volume 8, Issue 3 35