Chinese Journal of Tissue Engineering Research ›› 2011, Vol. 15 ›› Issue (9): 1627-1630.doi: 10.3969/j.issn.1673-8225.2011.09.026

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Excitation source design for endocardial three-dimensional mapping based on direct digital synthesis

Chen Zhong-zhong1, Tian Guo-qiang1, Su Zhi-jian1, Zheng Wei2   

  1. 1School of Mechanical Engineering, Zhengzhou University, Zhengzhou  450001, Henan Province, China
    2Henan Huanan Medical Science & Technology Co., Ltd., Zhengzhou   450001, Henan Province, China
  • Received:2010-10-10 Revised:2010-12-17 Online:2011-02-26 Published:2011-02-26
  • Contact: Tian Guo-qiang, Master, School of Mechanical Engineering, Zhengzhou University, Zhengzhou 450001, Henan Province, China tgq0217@126.com
  • About author:Chen Zhong-zhong☆, Doctor, Associate professor, Master’s supervisor, School of Mechanical Engineering, Zhengzhou University, Zhengzhou 450001, Henan Province, China zzchen@zzu.edu.cn
  • Supported by:

    the Foundation for Basic Natural Science Research of Education Department of Henan Province, No. 2007460021*

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Abstract:

BACKGROUND: The excitation source’s design is precondition of detecting the catheter’s position in endocardial three-dimensional (3D) mapping by low-frequency electric field.
OBJECTIVE: To design an excitation source for endocardial 3D mapping with simple structure and high integration, furthermore, to test the performance of the excitation source through animal experiments.
METHODS: Three channel different frequencies (28, 30, 32 kHz) sine voltage signals were generated based on the direct digital synthesis (DDS) technology and modularization design through three AD9851 chip controlled by single-chip microcomputer STC89C52. The excitation source's performance is analyzed by acquisition and processing the localization signal in animal right atrium.
RESOULTS AND CONCLUSION: The animal experimental results show that three signals' current value can be stable at 1mA and the frequency errors are 0.054%, 0.097%, 0.056%, respectively, furthermore, voltage signals in three directions can be extracted from the mapping catheter's sampling data. The excitation source has little frequency error and higher constant-current performance, and therefore can satisfy the endocardial mapping requirements.

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