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    • 35. 发明授权
    • Method and apparatus for estimation of resting respiratory quotient
    • US06884222B1
    • 2005-04-26
    • US10718075
    • 2003-11-20
    • James R. Braig
    • James R. Braig
    • A61B5/083A61B5/08
    • A61B5/083
    • A method and apparatus for determining a user's Respiratory Quotient (RQ) using just measured O2 and CO2 concentrations without use of a flow meter. The RQ is determined by measuring the user's real-time inspired O2 concentration (INS O2) and end tidal O2 concentration (ETO2) and measuring the user's real-time inspired CO2 concentration (INS CO2) and end tidal CO2 concentration (ETCO2), and then determining the user's RQ from the measured INS O2, ETO2, INS CO2, and ETCO2 values in accordance with the following equation: RQ=(ETCO2−INS CO2)/(INS O2−ETO2). In order to avoid error introduced by the flow rate, the measurement steps are preferably performed while the user is in a resting condition. Also, ETCO2 is preferably measured as the maximum CO2 value in a breath cycle of the user, while INS CO2 is preferably measured as the minimum CO2 value in a breath cycle of the user. Similarly, ETO2 is preferably measured as the minimum O2 value within a breath cycle of the user, while INS O2 is measured as the maximum O2 value within a breath cycle of the user. On the other hand, the values of INS CO2 and ETCO2 also may be determined in accordance with the invention by analysis of a CO2 waveform of a breath cycle of the user and the values of INS O2 and ETO2 determined by synchronizing timing of the O2 waveform of a breath cycle of the user with the CO2 waveform and sampling INS O2 and ETO2 values simultaneously with sampling of complementary CO2 values determined by analysis of the CO2 wavefomm. The RQ measuring device may include the oxygen and CO2 sensors in a mainstream or sidestream configuration.
    • 39. 发明授权
    • Disposable anti-fog airway adapter
    • 一次性防雾气道适配器
    • US06095986A
    • 2000-08-01
    • US123232
    • 1998-07-28
    • James R. BraigDaniel S. GoldbergerRoger O. HerreraMark L. Yelderman
    • James R. BraigDaniel S. GoldbergerRoger O. HerreraMark L. Yelderman
    • A61B5/097A61B5/08
    • A61B5/097
    • A disposable anti-fog airway adapter for use with a mainstream respiratory gas analyzer which provides a measurement of a patient's inhaled and exhaled gases. The airway adapter includes windows that are constructed of a thin, low heat capacity plastic that rapidly equilibrates to the temperature of the warm moist gases in the patient breathing circuit. In addition, the inside of the windows is also coated with an anti-fog surfactant either by laminating an anti-fog film with the window plastic prior to attaching the window to the airway adapter body or by first attaching the window to the airway adapter body and then applying the surfactant to the airway adapter after the window film is bonded in place so that the surfactant coats the entire inside of the adapter. The surfactant functions to increase the critical wetting tension of the surface it covers so that water on the window spreads into a uniform thin layer which does not absorb very much infrared energy and thus does not significantly reduce the signal strength. "Instant on" operation is accomplished because no heater and the like is necessary to warm up the windows to maintain them at an elevated temperature to prevent fogging. Numerous techniques are also provided for adhering the windows to the airway adapter body so that a substantially airtight seal may be obtained.
    • 用于主流呼吸气体分析仪的一次性防雾气道适配器,其提供对患者的吸入和呼出气体的测量。 气道适配器包括由能够快速平衡到患者呼吸回路中的温湿润气体的温度的薄的低热容塑料构成的窗户。 此外,窗户的内部还通过在将窗口附接到气道适配器主体之前层叠防雾膜与窗户塑料,或者通过首先将窗口附接到气道适配器本体上来涂覆防雾表面活性剂 然后在将窗膜粘合就位后将表面活性剂施用于气道适配器,使得表面活性剂涂覆在适配器的整个内部。 表面活性剂用于增加其覆盖的表面的临界润湿张力,使得窗户上的水扩散到不吸收非常多的红外能量的均匀薄层,因此不显着降低信号强度。 实现“即时打开”操作,因为不需要加热器等来预热窗户以将其保持在高温以防止起雾。 还提供了许多技术用于将窗口粘附到气道适配器主体,使得可以获得基本上气密的密封。