1. Date of download: 10/19/2017
Copyright © ASME. All rights reserved.
From: Computer-Controlled Eucapnic Voluntary Hyperpnea Challenge Method
J. Med. Devices. 2016;10(4): doi: /
Figure Legend:
(a) Overview of the proposed EVH system (computer and spirometer are not shown)—1: mouthpiece; 2: LPRR; 3: low-pressure hose; 4: HPRR; 5: high-pressure hose; 6: dive computer to work as digital pressure gauge; and 7: gas cylinder with compressed gas. (b) Overview of HPRR—b1: main body; b2: inlet port; b3: cylinder fitting; b4: outlet port to LPRR; and b5: outlet port to pressure gauge. (c) Inside view of HPRR—c1: intermediate pressure seat; c2: intermediate pressure spring; c3: O-ring; c4: inlet port; c5: high-pressure spring; c6: high-pressure seat; c7: high-pressure valve; c8 and c9: high-pressure chamber; c10: intermediate pressure chamber; c11: intermediate pressure valve; and c12: diaphragm. (d) Inside view of LRPP—d1: seat; d2: mouthpiece; d3 and d12: cracking resistance control; d4: intermediate portion; d5: demand lever; d6: gas from HPRR; d7: diaphragm; d8: rubber seating; d9: coil spring; d10: poppet valve; d11: tubular housing; d13: knob; and d14: ambient pressure.