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    • 1. 发明授权
    • Determination of leak and respiratory airflow
    • 泄漏和呼吸气流的测定
    • US08763609B2
    • 2014-07-01
    • US12649877
    • 2009-12-30
    • Michael Berthon-Jones
    • Michael Berthon-Jones
    • F16K31/00F16K31/02
    • A61M16/0003A61M16/0057A61M16/0069A61M16/024A61M2016/0021A61M2016/0027A61M2016/0033A61M2016/0036A61M2205/15
    • Methods and apparatus for determining leak and respiratory airflow are disclosed. A pressure sensor (34) and a differential pressure sensor (32) have connection with a pneumotach (24) to derive instantaneous mask pressure and airflow respectively. A microcontroller (38) estimates a non-linear conductance of any leak path occurring at a mask (12) as being the low pass filtered instantaneous airflow divided by the low pass filtered square root of the instantaneous pressure. The instantaneous leak flow is then the conductance multiplied by the square root of the instantaneous pressure, and the respiratory airflow is calculated as being the instantaneous airflow minus the instantaneous leak flow. The time constants for the low pass filtering performed by the microcontroller (38) can be dynamically adjusted dependent upon sudden changes in the instantaneous leak flow.
    • 公开了用于确定泄漏和呼吸气流的方法和装置。 压力传感器(34)和差压传感器(32)分别与喘振(24)连接以分别产生瞬时的掩模压力和气流。 微控制器(38)估计出现在掩模(12)处的任何泄漏路径的非线性电导是低通滤波的瞬时气流除以瞬时压力的低通滤波平方根。 瞬时泄漏流量是电导乘以瞬时压力的平方根,呼吸气流被计算为瞬时气流减去瞬时泄漏流量。 由微控制器(38)执行的低通滤波的时间常数可以根据瞬时泄漏流的突然变化而动态调节。
    • 6. 发明申请
    • DETERMINATION OF PATENCY OF THE AIRWAY
    • 确定航空公司的航班
    • US20080163873A1
    • 2008-07-10
    • US11946500
    • 2007-11-28
    • Michael Berthon-Jones
    • Michael Berthon-Jones
    • A61M16/00
    • A61M16/0066A61B5/087A61B5/7257A61F5/56A61M16/0006A61M16/0069A61M16/024A61M16/06A61M16/0875A61M2016/0039A61M2230/60
    • Methods and apparatus for determining the occurrence of an apnea, patency and/or partial obstruction of the airway are disclosed. Respiratory air flow from a patient is measured to give an air flow signal. The determination of an apnea is performed by calculating the variance of the air flow signal over a moving time window and comparing the variance with a threshold value. One determination of partial obstruction of the airway is performed by detecting the inspiratory part of the air flow signal, scaling it to unity duration and area and calculating an index value of the amplitude of the scaled signal over a mid-portion. Alternatively, the index value is a measure of the flatness of the air flow signal over the mid-portion. One determination of patency of the airway is performed by applying an oscillatory pressure waveform of known frequency to a patient's airway, calculating the magnitude of the component of said air flow signal at the known frequency induced by the oscillatory pressure waveform and comparing the calculated magnitude with a threshold value. Alternatively, the air flow signal is analysed to detect the presence of a component due to cardiogenic activity.
    • 公开了用于确定气道呼吸暂停,通畅和/或部分阻塞的发生的方法和装置。 测量来自患者的呼吸气流以产生气流信号。 通过计算移动时间窗口上的空气流信号的方差并将该方差与阈值进行比较来执行呼吸暂停的确定。 通过检测气流信号的吸气部分,将其缩放为单位持续时间和面积并计算中间部分上的缩放信号的幅度的指标值来执行气道部分阻塞的一个确定。 或者,指数值是空气流动信号在中间部分上的平坦度的量度。 通过将已知频率的振荡压力波形应用于患者的气道,计算由振荡压力波形引起的已知频率的所述空气流信号的分量的大小,并将计算出的大小与 一个阈值。 或者,分析空气流信号以检测由于心源性活动引起的组分的存在。
    • 9. 发明授权
    • Patient-ventilator synchronization using dual phase sensors
    • 患者通气机同步使用双相传感器
    • US07055522B2
    • 2006-06-06
    • US10986471
    • 2004-11-11
    • Michael Berthon-Jones
    • Michael Berthon-Jones
    • F16K31/02
    • A61M16/0069A61M16/0066A61M16/024A61M2016/0021A61M2016/0036A61M2230/60
    • An improved ventilator which delivers ventilatory support that is synchronized with the phase of the patent's respiratory efforts and guarantees a targeted minimum ventilation. Improved synchronization is achieved through an instantaneous respiratory phase determination process based upon measured respiratory airflow as well as measured respiratory effort using an effort sensor accessory, preferably a suprastemal notch sensor. The ventilator processes a respiratory airflow signal, a respiratory effort signal and their respective rates of change to determine a phase using standard fuzzy logic methods. A calculated pressure amplitude is adjusted based upon the calculated phase and a smooth pressure waveform template to deliver synchronized ventilation.
    • 一种改进的呼吸机,其提供与专利呼吸努力的阶段同步的通气支持,并确保有针对性的最小通气。 通过基于测量的呼吸气流的瞬时呼吸相位确定过程以及使用力传感器附件,优选地超临界陷波传感器测量的呼吸努力来实现改进的同步。 呼吸机处理呼吸气流信号,呼吸努力信号及其各自的变化率,以使用标准模糊逻辑方法确定相位。 计算的压力幅度根据计算的相位和平滑压力波形模板进行调整,以提供同步通气。