发明授权
- 专利标题: Electrode charge-neutral sensing of evoked ECG
- 专利标题(中): 电极电荷中性感应诱发心电图
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申请号: US997442申请日: 1992-12-28
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公开(公告)号: US5330512A公开(公告)日: 1994-07-19
- 发明人: John A. Hauck , Julio C. Spinelli
- 申请人: John A. Hauck , Julio C. Spinelli
- 申请人地址: MN St. Paul
- 专利权人: Cardiac Pacemakers, Inc.
- 当前专利权人: Cardiac Pacemakers, Inc.
- 当前专利权人地址: MN St. Paul
- 主分类号: A61N1/365
- IPC分类号: A61N1/365 ; A61N1/37 ; A61N1/00
摘要:
A cardiac pacemaker signal processing circuit adapted to obtain an evoked ECG signal. The circuit senses the electrical signals of the ring and tip electrodes in the unipolar mode from the bipolar lead after the electrical pacing stimulus has been applied to contract the ventricle of the heart. The residual oppositely polarized potentials at the ring and tip electrode, as well as the sensed evoked ECG signals, are added together to cancel out the opposing residual potentials, but to add the common polarized ECG signal. Thus, a high quality evoked ECG signal is obtained, free of the residual potentials, and subsequently utilized by R-wave detection circuits for sensing the QRS complex. The circuit includes compensating signal processing circuits to provide time domain signal processing weighting functions to match exponential time delay of the tip and ring electrodes, and includes amplitude adjusting compensation as well. Thus, the absolute amplitudes of the opposite polarized residual potentials will be adjusted to be equal, are summed, and canceled or nulled at the appropriate time in the time domain. Both biphasic and tripbasic pace pulse techniques are not required, the pace pulse amplitude can be reduced to extend the battery life of the pacemaker. Further, the post pace re-charging cycle is only interrupted and undertaken-passively to, again, reduce current drain on the battery. Classic R-wave detection circuits are adaptable to the signal processing circuit of the present invention.
公开/授权文献
- US5911641A Chain Tensioner and improved plunger retention thereof 公开/授权日:1999-06-15