Two-wavelength type respiratory gas concentration measuring apparatus
    1.
    发明授权
    Two-wavelength type respiratory gas concentration measuring apparatus 失效
    双波长型呼吸气体浓度测量仪

    公开(公告)号:US4998018A

    公开(公告)日:1991-03-05

    申请号:US483914

    申请日:1990-02-22

    摘要: A two-wavelength type respiratory gas concentration measuring device includes a connector tube which is held in the mouth of an examinee and which has airtight windows, a light source which applies infrared rays through the windows of the connector tube, and first and second filters. The first filter allows the transmission of a light component whose wavelength is such that it is absorbed by the respiratory gas, and the second filter allows the transmission of a light component whose wavelength is such that it is not absorbed by the respiratory gas. A photodetector converts the infrared rays transmitted through the filters into an electric signal. A first detector receives the electric signal and detects the light output of the first filter. A second detector receives the electric signal and detects the light output of the second filter. A power computing circuit performs a power computation of the output of the second detector with a power exponent m. A divider circuit divides the output of the first detector by the output of the first power computing circuit. A DC level detector detects the DC level of the photodetector when no infrared rays are applied. A second power computing circuit performs a power computation of the output of the DC-level detector with a power exponent of 2(m-1). A multiplier circuit multiplies the output of the second power computing circuit by the output of the divider.

    Measuring conduit for flow rate and concentration of fluid
    2.
    发明授权
    Measuring conduit for flow rate and concentration of fluid 失效
    测量流量和流体浓度的管道

    公开(公告)号:US4581942A

    公开(公告)日:1986-04-15

    申请号:US675231

    申请日:1984-11-27

    摘要: A measuring conduit adapted for flow rate and concentration of a fluid for use in a measuring apparatus which measures both the flow rate of the fluid such as a respiratory gas containing a particular gas component, for example, carbon dioxide, using an ultrasonic wave and the concentration of the particular gas component in an optical manner. In order to simultaneously measure the flow rate and concentration and also to reduce the dead space of the measuring conduit, this measuring conduit comprises a single conduit member through which the fluid flows; a pair of ultrasonic transducers attached to the conduit member so as to face each other along a line slanted with respect to a flow direction of the fluid; and a pair of light transmitting windows airtightly provided in the wall of the conduit member between the ultrasonic transducers so as to face each other. One of the light transmitting windows introduces a light beam from an external light source into the conduit member. The other light transmitting window introduces the light penetrating the fluid flowing through the conduit member into a photo detecting element of the measuring apparatus.

    摘要翻译: 一种测量管道,其适用于用于测量装置的流体的流速和浓度,该测量装置使用超声波测量诸如包含特定气体成分的呼吸气体(例如二氧化碳)的流体的流量, 特定气体组分以光学方式浓缩。 为了同时测量流量和浓度以及减少测量导管的死空间,该测量导管包括流体流过的单个导管构件; 一对超声换能器,其沿着相对于流体的流动方向倾斜的线相对于所述导管构件相互面对; 以及在超声波换能器之间气密地设置在导管构件的壁中的一对透光窗,以便彼此面对。 一个透光窗将来自外部光源的光束引入导管构件。 另一个透光窗口将穿过导管构件的流体的光引入测量装置的光检测元件。

    Respiratory gas concentration measuring apparatus
    3.
    发明授权
    Respiratory gas concentration measuring apparatus 失效
    呼吸气体浓度测定仪

    公开(公告)号:US4522204A

    公开(公告)日:1985-06-11

    申请号:US502133

    申请日:1983-06-08

    CPC分类号: G01N33/497 A61B5/0836

    摘要: A respiratory gas concentration measuring apparatus includes a chopper having a first filter for passing therethrough light from a light source and having a first wavelength which can be absorbed by a gas to be measured and a second filter for passing therethrough light from the light source and having a second wavelength which cannot be absorbed by the gas. The chopper is rotatable to position the first and second filters alternately in a light path. The light having passed through the filters is converted by a photodetector into an electric signal. A first detector detects an output from the first filter based on the electric signal, and a second detector detects an output from the second filter based on the electric signal. The apparatus has a power computing circuit for raising an output from said second detector to an mth power, m being a power exponent preset in the power computing circuit, and a divider circuit for dividing an output from the first detector by an output from the power computing circuit. The power exponent m is the ratio between a temperature-dependent coefficient .theta..sub.1 of the output of the first detector which varies exponentially with a temperature variation and a temperature-dependent coefficient .theta..sub.2 of the output of the second detector which varies exponentially with a temperature variation.

    摘要翻译: 一种呼吸气体浓度测量装置,包括:斩波器,具有第一滤光器,用于使来自光源的光通过,并具有可被待测气体吸收的第一波长;以及第二滤光器,用于使来自光源的光通过, 不能被气体吸收的第二波长。 切割器可旋转,以便在光路中交替地定位第一和第二滤光器。 已经通过滤光器的光被光电检测器转换成电信号。 第一检测器基于电信号检测来自第一滤波器的输出,并且第二检测器基于电信号检测来自第二滤波器的输出。 该装置具有用于将来自所述第二检测器的输出提高到第m个功率的功率计算电路,m是功率计算电路中预设的功率指数,以及用于将来自第一检测器的输出与来自功率的输出相分离的分频器电路 计算电路。 功率指数m是第一检测器的输出的温度依赖系数θ1与温度变化呈指数变化的温度依赖系数θ1和第二检测器的输出的温度依赖系数θ2之间的比率,其与温度成指数关系地变化 变异。

    Method of and apparatus for artificial respiration in synchronism with
voluntary breathing of a patient
    4.
    发明授权
    Method of and apparatus for artificial respiration in synchronism with voluntary breathing of a patient 失效
    与患者自愿呼吸同步的人工呼吸的方法和装置

    公开(公告)号:US4945899A

    公开(公告)日:1990-08-07

    申请号:US219075

    申请日:1988-07-14

    IPC分类号: A61B5/113 A61H31/02

    CPC分类号: A61H31/02 A61B5/113

    摘要: A method of and apparatus for effecting artificial respiration in synchronism with a patient's voluntary breathing. The apparatus is in the form of an external body ventilator with an assistor, and comprises a jacket, a suction pump, a suction pipe, a changeover device, a jaw movement detection device, and a changeover controlling device. The jacket has a rigid shell for surrounding the chest of a patient and forming an air-tight chamber between the chest and the rigid shell when the jacket is applied to the chest of the patient. The suction pipe is in fluid communication with the air-tight chamber of the jacket, and the changeover device is for effecting a changeover between releasing the air in the air-tight chamber through the suction pipe and into the atmosphere during voluntary respiration, and connecting the suction pipe to the suction pump during artificial respiration. The jaw movement detection device produces a signal corresponding to the movement of the jaw of the patient, and the changeover control device determines a timing of voluntary breathing by the patient on the basis of a signal detected by the jaw movement detection device, and controls the changeover device on the basis of the timing.

    摘要翻译: 一种与病人自愿呼吸同步进行人工呼吸的方法和装置。 该装置是具有助熔剂的外部身体呼吸器的形式,并且包括护套,抽吸泵,吸入管,切换装置,钳口移动检测装置和切换控制装置。 护套具有用于围绕患者胸部的刚性壳体,并且当将护套应用于患者的胸部时,在胸部和刚性壳体之间形成气密室。 吸入管与护套的气密室流体连通,并且切换装置用于在自愿呼吸期间通过吸入管释放气密室中的空气并进入大气中进行切换,并且连接 人造呼吸期间抽吸泵的抽吸管。 钳口运动检测装置产生与患者的钳口的移动相对应的信号,切换控制装置根据由卡爪移动检测装置检测出的信号来判定患者的自愿呼吸的定时, 切换装置在时间的基础上。