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Implantable cardiac stimulation device having automatic capture/threshold capability using a dynamically adjustable safety margin
Implantable cardiac stimulation device having automatic capture/threshold capability using a dynamically adjustable safety margin
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机译:具有可动态捕获的安全裕度的具有自动捕获/阈值功能的可植入心脏刺激装置
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摘要
An improved system and method for performing automatic capture/threshold detection in an implantable cardiac stimulation device or any device capable of stimulating some organ or tissue in the body. In existing systems a threshold stimulation energy level is periodically determined and a working stimulation energy level is then set by increasing the threshold stimulation energy level by a fixed or preprogrammed safety margin, e.g., a fixed voltage level or a percentage safety margin. However, in certain circumstances this safety margin may not be sufficient, resulting in either frequent threshold level determinations or losses-of-capture. To avoid these situations which may be wasteful of battery energy or dangerous for the patient, embodiments of the present invention periodically increase and/or decrease the safety margin according to the performance of the stimulation device, i.e., based upon the frequency of capture.
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