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. 2014 Apr 25;9(4):e95823. doi: 10.1371/journal.pone.0095823

Figure 4. The completed balloon catheter inflation device consists of: the USB interface (1), relay board (2), 24 VDC power supply (3), main pressure valve (4), pressure dial (5), pressure regulator (6), pressurizing solenoid valve (7), venting solenoid valve (8), pressure manifold (9), and air flow meter (10).

Figure 4

Components 1–3 comprise the electronic system while components 4–10 comprise the pneumatic subsystem.