Brinkløv M M, Andersen P K, Jørgensen S
Br J Anaesth. 1978 Oct;50(10):1025-9. doi: 10.1093/bja/50.10.1025.
The scavenging of gases from anaesthetic circuits may present hazards to the patient. The negative pressure relief valve prevents the generation of subatmospheric pressures in the circuit as a result of a discrepancy between the fresh gas flow and the gas evacuation rate. The ideal valve will open at a small negative pressure, and immediately permit a high gas inflow. Leakage with positive pressure in the circuit and admixture of atmospheric air during spontaneous respiration must not occur. Six different valves were studied. Two membrane valves came nearest to fulfilling the ideal requirements.
从麻醉回路中清除气体可能会给患者带来危险。负压释放阀可防止由于新鲜气体流量与气体排出速率之间的差异而在回路中产生低于大气压的压力。理想的阀门应在较小的负压下打开，并立即允许大量气体流入。回路中不得出现正压泄漏以及在自主呼吸期间大气空气的混入。对六种不同的阀门进行了研究。两种膜片阀最接近满足理想要求。
