目前我国各医院对医用氧气的收费仍沿用过去的计时收费的方法，尚未有一个准确有效的监测办法。由于流量计结构复杂、体积过大、造价高等原因，一直未在医院推广。我们针对医用气体流量的特点，利用现代科学技术设计了一种体积小、原理简单、成本低廉、安装方便、性能可靠、精 At present, the charges for medical oxygen used by hospitals in China are still based on past time-based charging methods. There is no accurate and effective monitoring method. Due to the complex structure of the flowmeter, its large size and high cost, it has not been popularized in hospitals. Based on the characteristics of medical gas flow, we designed a small size, simple principle, low cost, easy installation, reliable performance, and precision using modern science and technology.