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    • 94. 发明授权
    • Anti-tachycardia pacing method and apparatus for multi-chamber pacing
    • 用于多室起搏的抗心动过速起搏方法和装置
    • US07295873B1
    • 2007-11-13
    • US10893710
    • 2004-07-15
    • Xiaoyi MinGene A. BornzinMark W. Kroll
    • Xiaoyi MinGene A. BornzinMark W. Kroll
    • A61N1/362
    • A61N1/3622
    • Improved methods and devices perform tachycardia detection and anti-tachycardia pacing (ATP) to convert a tachycardia (e.g., VT or AT) to normal sinus rhythm. According to one embodiment, an anti-tachycardia pacing method includes sensing, during sinus rhythm, first and second cardiac signals at first and second sites, respectively, in a patient's heart. The first and second sites include left and right ventricles or left and right atria, for example. The method further includes sensing third and fourth cardiac signals at the first and second sites, respectively, during a tachycardia (e.g., ventricular tachycardia or atrial tachycardia). The cardiac signals are processed to provide respective values. One or more anti-tachycardia pacing pulses are delivered at the site closest to the reentrant circuit based on a comparison of a first ratio of the first and third values and a second ratio of the second and fourth values. Unipolar sensing of the cardiac signals may be employed by, for example, shorting together pairs of electrodes implanted at each site.
    • 改进的方法和装置执行心动过速检测和抗心动过速起搏(ATP)以将心动过速(例如VT或AT)转换为正常窦性心律。 根据一个实施例,抗心动过速起搏方法包括在病人心脏中分别在窦性心律期间感测第一和第二部位的第一和第二心脏信号。 第一和第二个地点包括左心室和右心室,例如左心房和右心房。 该方法还包括在心动过速(例如,室性心动过速或心房心动过速)期间分别在第一和第二位置处感测第三和第四心脏信号。 处理心脏信号以提供相应的值。 基于第一值和第三值的第一比率以及第二和第四值的第二比率的比较,在最靠近可重入电路的位置处递送一个或多个抗心动过速起搏脉冲。 可以通过例如将植入在每个部位的电极对短路来采用心脏信号的单极性感测。
    • 96. 发明授权
    • System and method for detecting cardiac ischemia based on T-waves using an implantable medical device
    • 使用可植入医疗装置检测基于T波的心脏缺血的系统和方法
    • US07218960B1
    • 2007-05-15
    • US10606299
    • 2003-06-24
    • Xiaoyi MinYougandh ChitreJeffery D. SnellGene A. BornzinJong Kil
    • Xiaoyi MinYougandh ChitreJeffery D. SnellGene A. BornzinJong Kil
    • A61B5/0452
    • A61B5/0452A61B5/0031A61B5/7242A61N1/3702
    • A technique is provided for detecting episodes of cardiac ischemia based on an examination of the total energy of T-waves. Since cardiac ischemia is often a precursor to acute myocardial infarction (AMI) or ventricular fibrillation (VF), the technique thereby provides a method for predicting the possible onset of AMI or VF. Briefly, the technique integrates internal electrical cardiac signals occurring during T-waves and then compares the result against a running average. If the result exceeds the average by some predetermined amount, ischemia is thereby detected and a warning signal is provided to the patient. The maximum slope of the T-wave is also exploited. Techniques are also set forth herein for reliably detecting T-waves, which help prevent P-waves from being misinterpreted as T-waves on unipolar sensing channels. The T-wave detection technique may be used in conjunction with ischemia detection or for other purposes.
    • 提供了一种基于对T波总能量的检查来检测心脏缺血发作的技术。 由于心脏缺血通常是急性心肌梗死(AMI)或心室颤动(VF)的前兆,因此该技术提供了一种预测AMI或VF可能发病的方法。 简而言之,该技术集成了T波期间发生的内部电心脏信号,然后将结果与运行平均值进行比较。 如果结果超过平均预定量,则由此检测到缺血,并向患者提供警告信号。 T波的最大斜率也被利用。 本文还阐述了可靠地检测T波的技术,这有助于防止P波被单解为单极感测通道上的T波。 T波检测技术可以与缺血检测或其他目的结合使用。