发明名称 |
DYNAMIC ATRIAL DETECTION SENSITIVITY CONTROL IN AN IMPLANTABLE MEDICAL CARDIAC STIMULATOR |
摘要 |
An implantable medical device (100) for electrically stimulating the heart to beat includes a sense circuit (208, 218) for detecting cardiac electrical activity. The sense circuit includes an amplifier (210, 220) with a dynamically adjustable gain to provide increased sensitivity to the electrogram during atrial fibrillation. Alternatively, sensitivity control is provided by dynamically adjusting threshold limits associated with a threshold detector included in the sense circuit. The sensitivity level of the medical device to the electrogram can be repeatedly adjusted after implantation and preferably is increased upon detection of the loss of normal sinus rhythm (NSR) in the heart's atria. The medical device is calibrated with the aid of a calibration device (400) external to the body to determine appropriate sensitivity levels. A method for calibrating and operating an implanted medical device with dynamically adjustable sensitivity is also disclosed for improving the medical device's sensitivity to atrial fibrillation.
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申请公布号 |
WO9846307(A1) |
申请公布日期 |
1998.10.22 |
申请号 |
WO1998US07524 |
申请日期 |
1998.04.13 |
申请人 |
SULZER INTERMEDICS INC. |
发明人 |
ROUTH, ANDRE;BRULS, ANNETTE;WOODSON, DRURY, III;VANDEGRIFF, JOSEPH;VERBOVEN, YVES |
分类号 |
A61N1/365;A61N1/362;A61N1/37;A61N1/39;(IPC1-7):A61N1/37 |
主分类号 |
A61N1/365 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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