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    • 91. 发明申请
    • DYNAMIC BANDWITH CONTROL IN AN IMPLANTABLE MEDICAL CARDIAC STIMULATOR
    • 可移植医疗心脏刺激仪中的动态带状控制
    • WO98046306A1
    • 1998-10-22
    • PCT/US1998/007491
    • 1998-04-13
    • A61N1/362A61N1/37A61N1/38A61N1/39A61N1/368
    • A61N1/3622A61N1/3704A61N1/385A61N1/395A61N1/3962
    • An implantable medical device (100) for electrically stimulating the heart to beat includes a sense circuit (218) for detecting cardiac electrical activity. The sense circuit (218) includes a band pass filter (215) with an adjustable frequency response. The frequency response can be repeatedly adjusted after implantation of the medical device and preferably is adjusted upon detection of the loss of normal sinus rhythm (NSR) in the heart's atria. The loss of NSR often indicates atrial fibrillation (AF), and the filter's frequency response is adjusted to increase the sensitivity of the sense circuit to the cardiac electrical activity typical during AF. The medical device is calibrated during implantation or at subsequent doctor visits with the aid of a calibration device (400) external to the body. Cardiac electrical activity in the form of an electrogram is transmitted from the medical device to the external calibration device. The transmitted electrogram preferably includes both NSR and AF rhythms. The calibration device computes (440, 490) two sets of filter coefficients; one set (440) for increased filter sensitivity during NSR and another set (490) for increased sensitivity during AF. The coefficients are transmitted to the medical device which uses the appropriate set of coefficients to increase the filter's frequency response during both NSR and AF.
    • 用于电刺激心脏跳动的可植入医疗装置(100)包括用于检测心脏电活动的感测电路(218)。 感测电路(218)包括具有可调频率响应的带通滤波器(215)。 可以在植入医疗装置之后重复地调整频率响应,并且优选地在检测到心脏心房中的正常窦性心律(NSR)的损失时进行调整。 NSR的损失经常表明心房颤动(AF),并且调整滤波器的频率响应以增加感觉电路对AF期间典型的心脏电活动的灵敏度。 借助于身体外部的校准装置(400),在植入期间或随后的医生访问期间校准医疗装置。 以电图形式的心脏电活动从医疗装置传输到外部校准装置。 传输的电描记图优选地包括NSR和AF节奏。 校准装置计算(440,490)两组滤波器系数; 一组(440)用于在NSR期间增加滤波器灵敏度,另一组(490)用于在AF期间增加灵敏度。 这些系数被传送到使用适当的系数集合的医疗设备,以在NSR和AF期间增加滤波器的频率响应。
    • 92. 发明申请
    • ATRIAL FIBRILLATION PREVENTION PACING SYSTEM
    • ATRIAL FIBRILLATION预防系统
    • WO1997040886A1
    • 1997-11-06
    • PCT/US1997002863
    • 1997-02-26
    • MEDTRONIC, INC.
    • MEDTRONIC, INC.MEHRA, Rahul
    • A61N01/39
    • A61N1/3962A61N1/3622A61N1/395
    • A method and apparatus for preventing fibrillation, particularly atrial fibrillation or flutter. In response to detection of an atrial premature beat at any given site in the atrial chamber, a low energy pulse burst is delivered to multiple sites of at least one chamber of the atrium for a time period sufficient to depolarize the entire atrium. Preferably, multiple pairs of sense electrodes are distributed about an atrial chamber or both atria to define discrete sensing sites and to widely distribute the simultaneously applied pacing energy pulse burst. Bradycardia pacing between the multiple electrode pairs is also preferably provided.
    • 一种用于预防原纤维颤动的方法和装置,特别是心房颤动或扑动。 响应于在房室的任何给定部位检测到心房早搏,将低能脉冲突发传送至心房至少一个室的多个位置一段足以使整个心房去极化的时间段。 优选地,多对感测电极围绕心房或两个心房分布以限定离散感测位置并且广泛分布同时施加的起搏能量脉冲串。 也优选提供多个电极对之间的心动过缓起搏。