Cuffless continuous blood pressure monitor
    2.
    发明授权
    Cuffless continuous blood pressure monitor 有权
    无袖连续血压计

    公开(公告)号:US06413223B1

    公开(公告)日:2002-07-02

    申请号:US09585382

    申请日:2000-06-01

    IPC分类号: A61B502

    摘要: A device for noninvasive, continuous monitoring of arterial blood pressure for advanced cardiovascular diagnoses. Most of the current noninvasive, continuous blood pressure measurement devices are mechanically intrusive and, therefore, cannot be used for long-term ambulatory monitoring. This new approach requires only simple, noninvasive monitoring devices such as finger photoplethysmographs and an electrical impedance photoplethysmograph (EIP) to monitor the dynamic behavior of the arterial blood flow. In this approach, measured signals from these noninvasive sensors on an arterial segment are integrated to estimate the blood pressure in the segment based on a hemodynamic model. A mathematical model of the arterial blood flow is derived and transformed into a state-space representation. In the modeling, a precise hemodynamic model for the arterial segment on which sensors are located is derived, and combined with relatively simplified models of the upstream and the downstream arterial flows to represent an entire arterial stream. Then, a Kalman filter is designed based on the model and it is shown that the internal variables such as the arterial blood pressure in the arterial segment can be estimated based on the measurements, even though the observability condition of the system may not be met. Simulation results indicate that the approach can generate an accurate estimation of the arterial blood pressure in real-time even from noisy sensor signals.

    摘要翻译: 用于无创,连续监测动脉血压用于晚期心血管诊断的装置。 目前大多数无创连续血压测量装置是机械性的,因此不能用于长期的动态监测。 这种新方法仅需要简单的无创监测装置,例如手指光电容积法和电阻抗光电容积法(EIP)来监测动脉血流的动态行为。 在这种方法中,来自这些无创传感器在动脉段上的测量信号被整合以基于血液动力学模型估计段中的血压。 导出动脉血流的数学模型,并将其转化为状态空间表示。 在建模中,导出了传感器位于其上的动脉段的精确血液动力学模型,并与上游和下游动脉血流的相对简化的模型结合以代表整个动脉血流。 然后,基于该模型设计卡尔曼滤波器,并且显示内部变量例如动脉段中的动脉血压可以基于测量来估计,即使可能不能满足系统的可观察性状况。 模拟结果表明,该方法即使从噪声传感器信号中也可实时产生动态血压的准确估计。

    Isolating ring sensor design
    3.
    发明授权
    Isolating ring sensor design 失效
    隔离环传感器设计

    公开(公告)号:US06402690B1

    公开(公告)日:2002-06-11

    申请号:US09552185

    申请日:2000-04-18

    IPC分类号: A61B500

    摘要: A monitoring system for monitoring the health status of a patient by performing measurements such as skin temperature, blood flow, blood constituent concentration, and pulse rate at the finger of the patient. The monitoring system has an inner ring proximate to the finger as well as an outer ring, mechanically decoupled from the inner ring, that shields the inner ring from external loads. Measurements are performed in accordance with a protocol that may be preprogrammed, or may be modified on the basis of real-time data or by command from a remotely located medical professional.

    摘要翻译: 一种监测系统,用于通过执行诸如皮肤温度,血流量,血液成分浓度和患者手指处的脉搏率的测量来监测患者的健康状况。 监控系统具有靠近手指的内环以及与内圈机械分离的外环,其将内环屏蔽外部负载。 测量根据可以被预编程的协议执行,或者可以基于实时数据或来自远程医疗专业人员的命令进行修改。