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公开(公告)号：WO2005082241A1
公开(公告)日：2005-09-09
申请号：PCT/US2005/006316
申请日：2005-02-24
IPC分类号： A61B5/00
CPC分类号： A61B5/14551 , A61B5/7203 , A61B5/725
摘要： A method and apparatus for reducing cross-talk in an oximeter. The oximeter includes a band pass filter. The amount of cross-talk through the band pass filter is estimated. Based on this estimate, the corner frequencies of the band pass filter are adjusted when it is designed to minimize the cross-talk. In one embodiment, a calibration mode is performed when a sensor is attached to the oximeter. In the calibration mode, the signals are measured with first only the red LED on and then with only the IR LED on. Any signal measured in the off channel is assumed to be a result of cross-talk from the other channel. The magnitude of the cross-talk is determined as a percentage, and subsequently the percentage is multiplied by the actual signal and subtracted from the other LED signal as cross-talk compensation.
摘要翻译： 一种用于减少血氧计中的串扰的方法和装置。 血氧计包括带通滤波器。 估计通过带通滤波器的串扰量。 基于这个估计，当设计带通滤波器的转角频率被设计成使串扰减至最小时。 在一个实施例中，当传感器附接到血氧计时执行校准模式。 在校准模式下，首先测量信号，只有红色LED亮起，然后只有红外LED亮起。 假设在关闭通道中测量的任何信号都是来自另一个通道的串扰结果。 串扰幅度被确定为一个百分比，随后百分比乘以实际信号，并从另一个LED信号中减去作为串扰补偿。
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公开(公告)号：WO2005082455A1
公开(公告)日：2005-09-09
申请号：PCT/US2005/006205
申请日：2005-02-25
IPC分类号： A61N5/00
CPC分类号： A61B5/14546 , A61B5/02427 , A61B5/14552 , A61B5/1495
摘要： An apparatus and method for determining if a forward voltage of an LED in a pulse oximeter is within a predetermined range. This is accomplished by measuring the current through the LED, and also by knowing the duty cycle of the pulse width modulator (PWM) drive signal to the LED.
摘要翻译： 一种用于确定脉搏血氧计中的LED的正向电压是否在预定范围内的装置和方法。 这通过测量通过LED的电流以及通过了解到LED的脉宽调制器（PWM）驱动信号的占空比来实现。
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公开(公告)号：WO2005082239A1
公开(公告)日：2005-09-09
申请号：PCT/US2005/006207
申请日：2005-02-25
IPC分类号： A61B5/00
CPC分类号： A61B5/14551
摘要： A light emitter drive circuit for an oximeter which utilizes a single inductor (L6) for driving multiple light emitters (50). The inductor is connected to a switching circuit (40) to multiple energy storage circuits, such as capacitors. These are alternately charged up, using the same inductor. Subsequently, the capacitors are alternately discharged for their corresponding light emitters through the same inductor. Also, the magnetic susceptibility of the LED drive circuit is reduced by using magnetic flux canceling in the inductor. In one embodiment, a toroidal inductor is used with geometric symmetry and its magnetic flux. In another embodiment, a dual core closed bobbin shielded inductor is used.
摘要翻译： 一种用于血氧计的发光体驱动电路，其使用单个电感器（L6）来驱动多个发光体（50）。 电感器连接到开关电路（40）到多个能量存储电路，例如电容器。 这些交替电荷使用相同的电感。 随后，电容器通过相同的电感器交替地对其相应的发光体放电。 此外，通过在电感器中使用磁通量消除来减少LED驱动电路的磁化率。 在一个实施例中，使用具有几何对称性及其磁通量的环形电感器。 在另一个实施例中，使用双核闭合筒管屏蔽电感器。
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4.发明申请DELTA-SIGMA MODULATOR FOR OUTPUTTING ANALOG REPRESENTATION OF PHYSIOLOGICAL SIGNAL 审中-公开用于输出生理信号的模拟表示的DELTA-SIGMA调制器
公开(公告)号：WO2005082237A1
公开(公告)日：2005-09-09
申请号：PCT/US2005/005934
申请日：2005-02-24
IPC分类号： A61B5/00
CPC分类号： A61B5/14551 , H03M7/3028 , H03M7/3042
摘要： A method and apparatus for providing a substantially real-time representation of an analog representation of a physiological signal. The waveform signal from the sensor is converted into digital form. A delta-sigma modulator is used as a simple Digital-to-analog Converter (ADC). The output can then be provided through a simple hardware filter to give an analog output signal in nearly real-time, which can be used for other instruments, synchronization, display, etc.
摘要翻译： 一种用于提供生理信号的模拟表示的基本上实时表示的方法和装置。 传感器的波形信号转换为数字形式。 Δ-Σ调制器用作简单的数模转换器（ADC）。 然后可以通过简单的硬件滤波器提供输出，几乎实时提供模拟输出信号，可用于其他仪器，同步，显示等。
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公开(公告)号：WO2005082242A1
公开(公告)日：2005-09-09
申请号：PCT/US2005/006336
申请日：2005-02-24
IPC分类号： A61B5/00
CPC分类号： A61B5/14552 , A61B5/0205 , A61B5/02416 , A61B5/14551 , A61B5/7203 , A61B5/7225 , A61B5/7228 , A61B5/725 , A61B5/7278
摘要： A pulse oximeter method and apparatus which provides (1) a notch filter (46) at a distance between a modulation frequency and a common multiple of commonly used power line frequencies (50, 60, 100 and 120) and also (2) a demodulation frequency greater than a highest pulse rate of a person and lower than any harmonic of 50, 60, 100 or 120 Hz, to filter ambient light interference, while choosing an optimum demodulation frequency that avoids interference from the notch filter or from harmonics of the line interference. Also, ambient light for any low frequency interference, such as power line interference, is measured both before and after each of the light emitter wavelengths and the average of the ambient light is then subtracted from the detected signal.
摘要翻译： 一种脉冲血氧计方法和装置，其提供（1）在调制频率和常用电力线频率（50,60,100和120）的公倍数之间的距离处的陷波滤波器（46），以及（2）解调 频率大于人的最高脉冲频率，并且低于50,60,100或120Hz的任何谐波，以滤除环境光干扰，同时选择避免来自陷波滤波器或线路谐波的干扰的最佳解调频率 干扰。 此外，在每个发光体波长之前和之后都测量任何低频干扰（例如电力线干扰）的环境光，然后从检测到的信号中减去环境光的平均值。
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公开(公告)号：WO2005082238A1
公开(公告)日：2005-09-09
申请号：PCT/US2005/006206
申请日：2005-02-25
IPC分类号： A61B5/00
CPC分类号： A61B5/1495 , A61B5/14551
摘要： A pulse oximeter with drive lines for driving red and IR LEDs, and a drive circuit for driving those drive lines. A processor controls the drive circuit using a red zero output line and an IR zero output line directly connected between the processor and the drive circuit. This allows a control signal to directly control the turning off of either the red or IR drive transistors to prevent forward current flow through the red and IR LEDs by overriding the ongoing programmable logic state machine control of the drive transistors. The effects of crosstalk and capacitive coupling are reduced as a result.
摘要翻译： 具有用于驱动红色和红外LED的驱动线的脉冲血氧计，以及用于驱动这些驱动线的驱动电路。 处理器使用红色零输出线和直接连接在处理器和驱动电路之间的IR零输出线来控制驱动电路。 这允许控制信号直接控制红色或红外驱动晶体管的关断，以通过覆盖驱动晶体管的正在进行的可编程逻辑状态机控制来防止正向电流流过红色和红外LED。 结果，减少串扰和电容耦合的影响。
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公开(公告)号：WO2005082236A2
公开(公告)日：2005-09-09
申请号：PCT/US2005/005913
申请日：2005-02-24
IPC分类号： A61B5/00
CPC分类号： A61B5/14551 , A61B5/7228 , H03M3/424 , H03M3/456 , H03M3/464
摘要： An oximeter uses a sigma-delta modulator and a multi-bit ADC with PWM feedback enabling high precision multi-bit conversion. Demodulation is done in software, thus requiring only a single hardware path for both red and IR. Multiple capacitors are switched into the integrator in the sigma-delta modulator, with different capacitors for red, IR and dark signals, thus enabling the use of the single hardware path. A switching circuit at the input of the sigma-delta modulator acts as a sample and hold, controlled by the PWM feedback.
摘要翻译： 血氧计使用Σ-Δ调制器和具有PWM反馈的多位ADC，实现高精度多位转换。 解调是在软件中完成的，因此只需要一个红色和红外的硬件路径。 多个电容器被切换到Σ-Δ调制器中的积分器，具有用于红色，红外和暗信号的不同电容器，从而能够使用单个硬件路径。 Σ-Δ调制器输入端的开关电路用作采样和保持，由PWM反馈控制。
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公开(公告)号：WO2005082236A3
公开(公告)日：2005-12-01
申请号：PCT/US2005005913
申请日：2005-02-24
发明人： PETERSEN ETHAN , SHEA WILLIAM , CHEW BRADFORD B
CPC分类号： A61B5/14551 , A61B5/7228 , H03M3/424 , H03M3/456 , H03M3/464
摘要： An oximeter uses a sigma-delta modulator and a multi-bit ADC (54) with PWM feedback (56) enabling high precision multi-bit conversion. Demodulation is done in software, thus requiring only a single hardware path for both red and IR. Multiple capacitors are switched into the integrator (44) in the sigma-delta modulator, with different capacitors for red, IR and dark signals, thus enabling the use of the single hardware path. A switching circuit (76) at the input of the sigma-delta modulator acts as a sample and hold, controlled by the PWM feedback (56).
摘要翻译： 血氧计使用Σ-Δ调制器和具有PWM反馈（56）的多位ADC（54），实现高精度多位转换。 解调是在软件中完成的，因此只需要一个红色和红外的硬件路径。 多个电容器被切换到Σ-Δ调制器中的积分器（44），具有用于红色，IR和暗信号的不同电容器，从而能够使用单个硬件路径。 Σ-Δ调制器的输入处的开关电路（76）用作采样和保持，由PWM反馈（56）控制。
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