Ultrasound apparatus permitting dynamic variation of the position of the
reception focus
    1.
    发明授权
    Ultrasound apparatus permitting dynamic variation of the position of the reception focus 失效
    超声波设备允许接收焦点位置的动态变化

    公开(公告)号:US4707813A

    公开(公告)日:1987-11-17

    申请号:US929736

    申请日:1986-11-12

    摘要: An ultrasound apparatus permitting dynamic variation of the position of the reception focus of a prescribable number of ultrasound transducer elements has a reception channel including a time-delay circuit for the received ultrasound echo signal following every ultrasound transducer element. For switching between different, prescribed time-delay values (T.sub.1, T.sub.2, . . . T.sub.n), the time-delay circuit is connected to a control device. A part of the time-delay circuit is redundantly designed, so that first and a second sub-circuits for forming the time-delayed ultrasound echo signal are present. A dissolve circuit is provided which causes the second sub-circuit to be faded in the reception channel when the first sub-circuit, in a blanked condition, is switched to a different time-delay value (T.sub.1, T.sub.2, . . . T.sub.n), and vice versa, by a control device. Significant time is thus saved when switching between the different focus positions of the ultrasound apparatus. Transmission of switching clicks onto the respectively activated sub-circuit is prevented by the use of isolating amplifiers.

    摘要翻译: 允许动态变化可规定数量的超声波换能器元件的接收焦点位置的超声波装置具有接收通道,该接收通道包括每个超声换能器元件之后的所接收的超声回波信号的延时电路。 为了在不同的规定时间延迟值(T1,T2 ... Tn)之间切换,延时电路连接到控制装置。 时间延迟电路的一部分被冗余地设计,使得存在用于形成时间延迟的超声回波信号的第一和第二子电路。 提供一种溶解电路,当处于消隐状态的第一子电路被切换到不同的延时值(T1,T2 ... Tn)时,使第二子电路在接收通道中褪色, ,反之亦然,由控制装置。 因此,在超声波装置的不同焦点位置之间切换时,节省了大量时间。 通过使用隔离放大器来防止切换点击到分别激活的子电路的传输。

    Arrangement for controlling a pacemaker
    2.
    发明授权
    Arrangement for controlling a pacemaker 失效
    控制起搏器的安排

    公开(公告)号:US5626624A

    公开(公告)日:1997-05-06

    申请号:US403702

    申请日:1995-03-17

    IPC分类号: A61N1/365 A61N1/368

    CPC分类号: A61N1/36521 A61N1/368

    摘要: An arrangement is provided for controlling a stimulation frequency of a pacemaker. The arrangement includes an atrial bipolar electrode system and a ventricular bipolar electrode system. A first electrode pair comprises an electrode from each of the atrial and ventricular bipolar electrode systems, with the electrodes of the first electrode pair being disposed intracardially in the atrium and ventricle, respectively. A pacemaker control unit generates stimulation pulses for stimulating the heart. A constant current source impresses a constant current to a second electrode pair, comprising at least one electrode from one of the atrial and ventricular bipolar electrode systems being disposed intracardially in one of the atrium and ventricle, for developing an electrical potential between the electrodes of the first electrode pair during predetermined cardiac phases. An impedance measuring unit measures impedance between the electrodes of the first electrode pair based upon the electrical potential and constant current and generates a control signal representing relative cardiac volume as a function of the measured impedance. The control signal is fed to the pacemaker control unit for influencing a stimulation frequency of the stimulation pulses.

    摘要翻译: PCT No.PCT / DE93 / 00890 Sec。 371日期1995年3月17日 102(e)1995年3月17日PCT PCT 1993年9月16日PCT公布。 公开号WO94 / 06513 日期1994年3月31日提供了一种控制起搏器刺激频率的方案。 该装置包括心房双极电极系统和心室双极电极系统。 第一电极对包括来自心房和心室双极电极系统中的每一个的电极,第一电极对的电极分别设置在心房和心室内。 起搏器控制单元产生用于刺激心脏的刺激脉冲。 恒定电流源向第二电极对施加恒定的电流,其包括至少一个电极,其中心电极和心室双极电极系统中的一个心室内设置在心房和心室中的一个中,用于在电极之间形成电位 第一电极对在预定的心脏期。 阻抗测量单元基于电势和恒定电流来测量第一电极对的电极之间的阻抗,并且产生表示作为测量的阻抗的函数的相对心脏容积的控制信号。 控制信号被馈送到起搏器控制单元,用于影响刺激脉冲的刺激频率。

    Method of processing signals characteristic of cardiac activity and an
associated device
    3.
    发明授权
    Method of processing signals characteristic of cardiac activity and an associated device 失效
    处理心脏活动特征的信号的方法及相关装置

    公开(公告)号:US5891169A

    公开(公告)日:1999-04-06

    申请号:US776294

    申请日:1997-01-29

    IPC分类号: A61N1/362 A61N1/368 A61N1/39

    CPC分类号: A61N1/3622 A61N1/368

    摘要: A method for processing a signal characteristic of cardiac activity in the atrium (A) and/or ventricle (V) of a heart (H) and for evaluating this signal with a view to obtaining a control signal for a cardiac pacemaker and/or defibrillator (3) can be carried out by: receiving a time dependent signal from at least one intracardial signal sensor (1, 2) in the atrium and/or ventricle; feeding the signal picked up by each signal sensor (1, 2) to a read and evaluation circuit (6) with a threshold characteristic; comparing the signals with a detection threshold; evaluating the result of the comparison to obtain an indication as to the presence of normal sinus-type cardiac activity or fibrillations; and producing the control signal, which characterizes the comparison result. The signal from the at least one sensor (1, 2) is fed to a first input stage (8, 11) which has a first adjustable detection threshold (TS(A), TS(V) that is constant in time and to a second input stage (9, 10) which has a second adjustable detection threshold TL(A), TL(V) that can be adjusted independently of the first detection threshold but is constant in time once set. The signal from the at least one intracardial signal sensor is processed in these first and second input stages.

    摘要翻译: PCT No.PCT / DE95 / 01030 Sec。 371日期1997年1月29日 102(e)日期1997年1月29日PCT提交1995年7月28日PCT公布。 出版物WO96 / 04042 日期1996年2月15日一种用于处理心脏(H)的心房(A)和/或心室(V)中的心脏活动特征的方法,并用于评估该信号以获得心脏的控制信号 起搏器和/或除纤颤器(3)可以通过以下方式来实现:从心房和/或心室中的至少一个心内信号传感器(1,2)接收与时间相关的信号; 将由每个信号传感器(1,2)拾取的信号馈送到具有阈值特性的读取和评估电路(6); 将信号与检测阈值进行比较; 评估比较结果以获得关于正常窦型心脏活动或原纤化的存在的指示; 并产生表征比较结果的控制信号。 来自至少一个传感器(1,2)的信号被馈送到第一输入级(8,11),该第一输入级具有第一可调检测阈值(TS(A),TS(V)),其在时间上是恒定的 第二输入级(9,10),其具有第二可调检测阈值TL(A),TL(V),其可以独立于第一检测阈值进行调整,但是一旦设置就是恒定的,来自至少一个心内 信号传感器在这些第一和第二输入级中被处理。