1. Spirograph for the diagnosis of asthma, characterized in that consists of three parts (1, 5 and 6) coupled together. As shown in Figure 1, it is constituted by a rigid tube (1) of non-toxic material and open at both ends whose inner and outer diameter is within the range of 2 to 4 cm. and a length less than 20 cm. At both ends of the tube (1) less than 2 cm. each end are installed two sensors (2) moisture. At one end of the tube (1) engage sealingly a nozzle (3) exchangeable and disposable. The analog signal outputted by the sensors (2) relative humidity is conditioned (4) before entering the converter (5) analog to digital. Converter (5) sampled signal to the user configurable rate. Once sampled, it will be processed signal (6) digitally and sent to the calculation software and displayed.
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