| 摘要 |
A device for canceling unwanted excitation waves in an excitable tissue, particularly those causing cardiac tachyarrhythmias, which comprises circuitry for generating a unidirectional Device-Generated Excitation Wave (DGEW) in the tissue. The device comprises first and second stimulation electrodes, each fed by a power supply, which generate current impulses having magnitudes respectively lower and higher than the threshold level of the excitable tissue. The positions and activation timing of the electrodes are set so that the two impulses interact with each other only in one desired direction and every impulse except the desired DGEW decays. A method is also provided for suppressing malignant cardiac arrhythmias, caused by an unwanted excitation wave, which comprises generating in two different locations of the myocardium two excitation impulses having magnitudes respectively lower and higher than the threshold level of the excitable tissue, determining the distance between said locations and the time of the generation of the impulses so that a unidirectional DGEW is generated, and applying the DGEW to the myocardial tissue to cancel the uwanted excitation wave in its re-entry path.
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