Retrospective Study
Copyright ©The Author(s) 2020.
World J Clin Cases. Jun 6, 2020; 8(11): 2201-2209
Published online Jun 6, 2020. doi: 10.12998/wjcc.v8.i11.2201
Figure 3
Figure 3 The test results of different devices. A: The negative pressures of the three drainage devices with the injection of water; B: The negative pressures of the three drainage devices with the injection of air.