Aim: A simple and cost effective whistle peak flow meter was designed in order to comply with the financial restraints and difficulty of interpretation experienced by some of the patients attending the paediatric asthma clinic.Method: A whistle was designed that operates as the electronic equivalent of a current source where I(t) equals the air flow at the inlet By setting Γout (outflow orifice size) the peak flow can be fixed when the whistle will blow. The air flow (current) passing through the whistle resistance will generate a pressure P(t) that will activate the whistle sound at a given flow I(t). By selecting a range of peak flow (50 - 700 l/s) at about 60% of the required value for age and BSA, the patient can be sent home with a whistle than will warn when the peak flow falls below a safe level.Results: The laboratory peak flow results correlate well with the peak flow generator flows (wave No. 24) r = 0.87, n = 40, and the whistle is well accepted by the patients.
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机译：目的：设计一种简单且经济高效的口哨峰值流量计，以符合部分儿童哮喘诊所就诊患者的财务限制和解释困难。方法：设计一种口哨，其功能相当于电子I（t）等于入口处的气流的电流源通过设置Γout（流出孔尺寸），可以在吹哨时固定峰值流量。穿过汽笛阻力的气流（电流）将产生压力P（t），该压力将在给定流量I（t）激活汽笛声。通过选择峰值流量（50-700 l / s）的范围（约为年龄和BSA所需值的60％），患者可以被吹口哨送回家，而不是在峰值流量低于安全水平时发出警告。结果：实验室的峰值流量结果与峰值流量发生器流量（24号波浪）的相关性很好，r = 0.87，n = 40，并且哨声为患者所接受。
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