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    • 5. 发明授权
    • Optical sensor for pulse oximeter
    • 脉搏血氧仪光学传感器
    • US4880304A
    • 1989-11-14
    • US33406
    • 1987-04-01
    • Jonathan P. JaebDennis W. GilstadRonald L. Branstetter
    • Jonathan P. JaebDennis W. GilstadRonald L. Branstetter
    • G01N21/27A61B5/00A61B5/145A61B5/1455G01N21/31G01N21/35
    • A61B5/14552G01N21/3151G01N2021/3181
    • An improved optical sensor which has increased sensitivity and which is resistant to the effects of ambient light. In one embodiment of the invention, the sensor housing has a flat lower face with a central protrusion in which a plurality of light emitting diodes and an optical sensor are mounted. When the sensor is placed on the patient's tissue, the portion of the sensor face containing the LEDs and detector protrudes slightly into the tissue to provide improved optical coupling of the sensor to the skin. A light absorbing compliant material is attached to the perimeter of the sensor to reduce the effects of ambient light and to provide a cushion to minimize discomfort to the patient. In an alternate embodiment of the sensor, the LEDs and detector are mounted in a horizontal configuration substantially parallel to the surface of the tissue. The light produced by the LEDs is projected into a central chamber of the housing where the respective beams are combined and directed toward the tissue. In this emodiment, the desired combining of the beams can be achieved through the use of a set of mirrors or a prism. Various combinations of the improvements provided by each of the embodiments described above can be incorporated into either a transmission or backscatter optical sensor to provide a compact, sensitive optical sensor which is resistant to interference caused by ambient light.
    • 一种改进的光学传感器,其具有增加的灵敏度并且抵抗环境光的影响。 在本发明的一个实施例中,传感器壳体具有平坦的下表面,其中安装有多个发光二极管和光学传感器。 当传感器放置在患者的组织上时,包含LED和检测器的传感器面的部分略微突出到组织中,以提供传感器与皮肤的改进的光耦合。 光吸收顺应性材料附着到传感器的周边以减少环境光的影响并提供缓冲垫以最小化对患者的不适。 在传感器的替代实施例中,LED和检测器以基本上平行于组织表面的水平配置安装。 由LED产生的光被投射到壳体的中心室中,其中各个光束被组合并指向组织。 在这种情况下,可以通过使用一组反射镜或棱镜来实现光束的期望组合。 上述每个实施例提供的改进的各种组合可以被并入传输或反向散射光学传感器中,以提供抵抗由环境光引起的干扰的紧凑的,灵敏的光学传感器。
    • 8. 发明授权
    • Noninvasive reflectance oximeter
    • 无创反射血氧计
    • US4796636A
    • 1989-01-10
    • US95125
    • 1987-09-10
    • Ronald L. BranstetterReuben W. Edgar, Jr.
    • Ronald L. BranstetterReuben W. Edgar, Jr.
    • A61B5/145A61B5/00A61B5/1455G01N21/31G01N33/48
    • A61B5/14551G01N21/3151
    • A noninvasive optical oximeter for measuring oxygen saturation of arterial blood. A sample of blood is illuminated with light at two different wavelengths. Light reflected by the blood is sensed by a photodetector and an output signal is created in response thereto. The output signal is processed to form a quotient representing the AC components of the reflected light at each wavelength. The oxygen saturation of the blood is calculated by correlating this quotient with an oxygen saturation reference curve uniquely representative of the blood oxygen saturation characteristics of a particular individual. The reference curve used in the preferred embodiment of the invention is calibrated in a two-step process which minimizes the effects of calibration errors. A first oxygen saturation reference curve is calculated which is based on a linear relationship between the ratio of the AC components of the reflected light. This curve is then used to calibrate a second reference curve based on a linear ratio of the squared values of the AC components of the reflected light. Once the second reference curve has been properly calibrated, it is used for all subsequent measurements of oxygen saturation.
    • 一种用于测量动脉血氧饱和度的无创光学血氧计。 用两种不同波长的光照射血样。 由光检测器感测由血液反射的光,响应于此产生输出信号。 处理输出信号以形成表示每个波长的反射光的AC分量的商。 通过将该商与独特地代表特定个体的血氧饱和度特征的氧饱和度参考曲线相关联来计算血液的氧饱和度。 在本发明的优选实施例中使用的参考曲线在两步骤过程中被校准,这使得校准误差的影响最小化。 计算第一氧饱和度参考曲线,其基于反射光的AC分量的比率之间的线性关系。 然后,该曲线用于基于反射光的AC分量的平方值的线性比率来校准第二参考曲线。 一旦第二个参考曲线被正确校准,它就被用于所有后续的氧饱和度测量。
    • 9. 发明授权
    • System for correction of trends associated with pulse wave forms in
oximeters
    • 用于矫正血氧仪中脉搏波形相关趋势的系统
    • US5216598A
    • 1993-06-01
    • US774147
    • 1991-10-15
    • Ronald L. BranstetterReuben W. Edgar
    • Ronald L. BranstetterReuben W. Edgar
    • A61B5/00G06F17/00
    • A61B5/14551A61B5/7207
    • A noninvasive optical oximeter measures oxygen saturation of arterial blood. A patient's arterial blood is illuminated with light at two different wavelengths and the intensity of the reflected light is sensed by a photodetector and an output signal is created in response thereto. The output signal is processed to form a ratio representing the AC component of the reflected light at each wavelength over the DC component. The oxygen saturation of the blood is calculated by correlating the quotient of these ratios with an oxygen reference curve uniquely representative of the blood oxygen characteristics of a particular patient. The pulse amplitude signals for the AC component at each wavelength are compensated for the effects of upward or downward trends and, therefore, the accuracy of the blood oxygen saturation calculation is significantly increased.
    • 无创光学血氧计测量动脉血的氧饱和度。 用两个不同波长的光照射患者的动脉血,并且由光电检测器检测反射光的强度,并响应于此产生输出信号。 处理输出信号以形成表示在DC分量上的每个波长处的反射光的AC分量的比率。 通过将这些比率的商与独特地代表特定患者的血氧特性的氧参考曲线相关联来计算血液的氧饱和度。 针对各波长的AC分量的脉冲幅度信号,补偿向上或向下趋势的影响,因此,血氧饱和度计算的精度显着提高。