Abstract: A device and a method for the analysis of the air exhaled by a subject in order to measure basal metabolism of the subject comprise a main line for a sampling flow of the air exhaled by a subject who breathes spontaneously or a subject undergoing assisted pulmonary ventilation. A mixing mini-chamber is provided for mixing a plurality of air sampling flows exhaled by the subject within a number of respiratory cycles. Sensors for sensing the oxygen concentration and the carbon dioxide concentration respectively measure the oxygen concentration and the carbon dioxide concentration within the air flow in the main line. The device further comprises an electronic control unit which processes signals from the sensors for obtaining a measurement of metabolism of the subject within a number of respiratory cycles.

Abstract: A flowmeter and filter assembly for spirometry have a flowmeter with a turbine rotor and sensor means for detecting the speed of rotation of the rotor, and a filter upstream of the flowmeter. An air-conveying device modifies the direction of the flow of air at an outlet from the filter to set the rotor in rotation within the flowmeter. The air-conveying device is integrated in the filter instead of in the flowmeter.

Abstract: A device for measuring the consumption of oxygen and the consumption of carbon dioxide by a subject comprises an air collecting member for collecting the flow of air breathed, a flowmeter for measuring the flow rate of air exhaled by the subject, and a sampling line for sampling a portion of the flow of air exhaled by the subject. A pump, with substantially constant capacity draws the aforesaid portion of flow of air into the sampling line. A mixing chamber is interposed in the sampling line for collecting and mixing together flows of air exhaled by the subject in a number of breathing cycles. Means for sensing the concentration of oxygen and means for sensing the concentration of carbon dioxide are arranged in the sampling line.

Abstract: A device for measuring the consumption of oxygen and the consumption of carbon dioxide by a subject comprises an air collecting member for collecting the flow of air breathed, a flowmeter for measuring the flow rate of air exhaled by the subject, and a sampling line for sampling a portion of the flow of air exhaled by the subject. A pump, with substantially constant capacity draws the aforesaid portion of flow of air into the sampling line. A mixing chamber is interposed in the sampling line for collecting and mixing together flows of air exhaled by the subject in a number of breathing cycles. Means for sensing the concentration of oxygen and means for sensing the concentration of carbon dioxide are arranged in the sampling line.

Abstract: A device for the survey of the breathing ventilation and oxygen consumption has a mask M, worn by the person being examined, a control modulus that realizes a sample method of the breathing volume and of the turnover management, and a radio transmitter 25 that sends the signals to a fixed reception and elaboration unity UF. The device is portable due to the very small dimensions thereof, and very light due to the presence of a slow analyzer that has the advantages of the quick analyzers, by means of controlled turnover sampling that makes the micro mixing chamber 3 at fixed capacity equivalent to a dynamic chamber at variable capacity. At the end of each breathing action, when the air flow is annulled, the impulses due to the moment of inertia of the turbine 7 are suppressed by means of the pressure transducer 9 that identifies the annulment of the flow and corrects the signal still provided by turbine 7.