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    • 3. 发明授权
    • Implantable medical device for measuring mechanical heart function
    • 用于测量机械心脏功能的植入式医疗设备
    • US06959214B2
    • 2005-10-25
    • US09996138
    • 2001-11-28
    • Forrest C. M. PapePaul J. Huelskamp
    • Forrest C. M. PapePaul J. Huelskamp
    • A61N1/362A61N1/365
    • A61N1/36514A61N1/3627
    • An implantable device for measuring mechanical heart function of selected heart chambers using a heart contraction detection system that includes a magnetic field sensor. The system may be used for monitoring signs of acute or chronic cardiac heart failure, to enable diagnosis of the condition of the heart, to prescribe appropriate therapies, and to assess delivered pacing therapies. Distance measurements within the heart are made using the magnetic field sensor which is implanted at a sensor site in or on one of the right or left ventricle. A magnet implanted at a site relative to the other of the left or right heart ventricle is sufficiently spaced at a distance that fluctuates with expansion and contraction of the ventricles. The magnetic field sensor provides a sensor output signal having a signal magnitude proportional to the magnetic field strength of the magnet, and which is indicative of changing cardiac dimensions.
    • 一种用于使用包括磁场传感器的心脏收缩检测系统来测量所选择的心室的机械心脏功能的可植入装置。 该系统可以用于监测急性或慢性心脏衰竭的迹象,以便能够诊断心脏的状况,开出适当的治疗方法,以及评估发放的起搏疗法。 心脏内的距离测量使用植入在右心室或左心室中的一个传感器位置的磁场传感器来进行。 植入在相对于左心室或右心室另一个的位置处的磁体在与心室的扩张和收缩波动的距离处充分间隔开。 磁场传感器提供具有与磁体的磁场强度成比例的信号幅度的传感器输出信号,并且其指示改变心脏尺寸。
    • 6. 发明授权
    • Implantable medical device incorporating performance based adjustable
power supply
    • 可植入医疗器械,采用基于性能的可调电源
    • US6141583A
    • 2000-10-31
    • US247458
    • 1999-02-09
    • Forrest C. M. PapeCarl A. Schu
    • Forrest C. M. PapeCarl A. Schu
    • A61N1/08A61N1/378
    • A61N1/378A61N1/08
    • A method or apparatus for conserving power in an implantable medical device (IMD) of the type having at least one IC powered by a battery wherein, in each such IC, a voltage dependent oscillator for providing oscillator output signals at an oscillation frequency dependent upon applied supply voltage to the IC is incorporated into the IC. The voltage dependent oscillator oscillates at a frequency that is characteristic of the switching speed of all logic circuitry on the IC die that can be attained with the applied supply voltage. The applied supply voltage is regulated so that the oscillation frequency is maintained at no less than a target or desired oscillation frequency or within a desired oscillation frequency range. The power supply voltage that is applied to the IC is based directly on the performance of all logic circuitry of the IC. In order to provide the comparison function, the oscillator output signals are counted, and the oscillator output signal count accumulated over a predetermined number of system clock signals is compared to a target count that is correlated to the desired oscillation frequency. The counts are compared, and the supply voltage is adjusted upward or downward or is maintained the same dependent upon whether the oscillator output signal count falls below or rises above or is equal to the target count, respectively. The supply voltage adjustment is preferably achieved employing a digitally controlled power supply by calculating a digital voltage from the comparison of the oscillator output signal count to the target count, and storing the digital voltage in a register of the power supply.
    • 一种用于在具有由电池供电的至少一个IC的类型的可植入医疗装置(IMD)中节省电力的方法或装置,其中在每个这样的IC中,具有电压的振荡器,用于以取决于应用的振荡频率提供振荡器输出信号 将IC的电源电压并入IC。 电压相关振荡器以可以通过施加的电源电压获得的IC芯片上所有逻辑电路的开关速度特性的频率振荡。 所施加的电源电压被调节,使得振荡频率保持在不小于目标或期望的振荡频率或在期望的振荡频率范围内。 施加到IC的电源电压基于IC的所有逻辑电路的性能。 为了提供比较功能,对振荡器输出信号进行计数,并将累积在预定数量的系统时钟信号上的振荡器输出信号计数与与期望的振荡频率相关的目标计数进行比较。 比较计数,并且电源电压被向上或向下调整或保持相同,这取决于振荡器输出信号计数是否分别低于或等于目标计数。 优选地,通过从振荡器输出信号计数与目标计数的比较计算数字电压,并将数字电压存储在电源的寄存器中,通过使用数字控制的电源来实现电源电压调节。