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    • 78. 发明申请
    • DEVICE FOR MEASURING THE CONSUMPTION OF OXYGEN AND THE CONSUMPTION OF CARBON DIOXIDE BY A SUBJECT
    • 用于测量氧气消耗和二氧化碳消耗的装置
    • US20140235961A1
    • 2014-08-21
    • US14162219
    • 2014-01-23
    • COSMED S.r.l.
    • Paolo BRUGNOLI
    • A61B5/08G01N19/10A61B5/087
    • G01N19/10A61B5/0833A61B5/0836A61B5/087A61B5/097
    • 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. The pump is with constant capacity, but is controlled in a PWM mode in order to simulate a capacity that varies in proportion to the variation of the flow during the breathing cycle so as to render measurement of the consumption of oxygen reliable even though the mixing chamber does not receive the entire flow exhaled by the subject. The device further comprises a bypass line of the mixing chamber, through which the flow of air can pass without passing through the mixing chamber. A valve for selecting the measuring mode can be displaced selectively into two different positions, to get the flow of air that traverses the sampling line to converge either through the mixing chamber, when an average measurement is to be made of the consumption of oxygen by the subject in the course of a number of breathing cycles, or through said bypass line, when an instantaneous measurement is to be made of the consumption of oxygen by the subject in each breathing cycle.
    • 用于测量受试者的氧气消耗和二氧化碳消耗的装置包括用于收集呼吸空气流的空气收集构件,用于测量被检体呼出的空气的流量的流量计和用于取样的取样管线 由受试者呼出的空气流的一部分。 具有基本恒定容量的泵将上述部分的空气流吸入采样管线。 在采样管路中插入混合室,用于收集和混合受试者在多个呼吸循环中呼出的空气流。 用于感测氧浓度的手段和用于感测二氧化碳浓度的装置布置在采样管线中。 该泵具有恒定容量,但是以PWM模式控制,以便模拟与呼吸循环期间的流量变化成比例变化的容量,从而使氧气消耗的测量可靠,即使混合室 没有收到受试者呼出的整个流量。 该装置还包括混合室的旁通管线,空气流通过该管道而不通过混合室。 用于选择测量模式的阀可以选择性地移动到两个不同的位置,以便通过采样管线的空气流通过混合室会聚,当平均测量氧气消耗量时 在多次呼吸循环的过程中,或通过所述旁路管线,当要在每个呼吸循环中瞬时测量受试者的氧气消耗量时。