1990 Fiscal Year Final Research Report Summary
Development of a Reduced Energy type Implantable Defibrillator.
| Project/Area Number |
01550306
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
電子機器工学
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| Research Institution | Faculty of Engineering, Niigata University. |
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Principal Investigator |
ISHII Ikuo Niigata University, Faculty of Engineering, Professor, 工学部, 教授 (80018481)
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| Co-Investigator(Kenkyū-buntansha) |
HORI Jun-ichi Niigata University, Faculty of Engineering, Assistant, 工学部, 助手 (80209262)
MAKINO Hideo Niigata University, Faculty of Engineering, Associate Professor, 工学部, 助教授 (80115071)
YAMATO Junji Niigata University, Faculty of Engineering, Professor, 工学部, 教授 (60143749)
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| Project Period (FY) |
1989 – 1990
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| Keywords | Implantable defibrillator / Arrhythmia detection / Low energy defibrillation / Sequential defibrillation |
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| Research Abstract |
1) Development of arrhythmia detection method
To develop a new arrhythmia detection method, we used the interval histogram method for ECG, and we made an on-line real time detection program to analyze the frequency variation of the ECG. After that, we installed the program into a battery-type arrhythmia detection circuit, and confirmed its function. In the prior use of the implantable defibrillator, the probability density function was the only method used due to the limitation of power consumption and circuitry. However, as our method can detect the basic frequency components in real time and with smaller circuitry, it is beneficial to separate arrhythmia more accurately.
2) Development of an implantable defibrillator
The arrhythmia detection circuit and the output circuit were developed. The detection circuit was used to execute our method, and the output circuit has the capability of sequential stimulation which is effective to reduce the defibrillation energy. In our stimulation metho
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d, the voltage of the second stimulation pulse is less than the first pulse because of the simple circuit. However, it is easy for an ordinary single output defibrillator to be modified to a sequential defibrillator by simple improvement of the output circuitry. At the same time, there was no difference in the defibrillation voltage threshold between our system and an external type sequential defibrillator. Therefore, this stimulation method is hopeful due to its smaller size and lower defibrillation energy circuit.
3) Experimental results
In animal experiments, we confirmed the function of the arrhythmia detection circuit and the output circuit. As a result, we proposed the basic design of a lower energy implantable defibrillator.
In the future, we will combine a database which contains various ECG data with the detection program to develop a personal oriented detection system. Moreover, we will also make all effort to seal the new implantable system for use in chronic animal experiments. Less
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