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Schematic of the PCA device and its application. A In the 1-channel group, only the selector-bolus channel was actually utilized. B In the 2-channel group, both the selector-bolus channel and continuous channel were utilized by dividing the drugs between the two. The adjustable flow dial has a range of 0, 1, and 2 mL/h, but only 0 or 2 mL/h were used in both groups per our study protocol
