Proceedings of the Acoustical Society of Korea Conference (한국음향학회:학술대회논문집)

The Acoustical Society of Korea (한국음향학회)
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A Study of the Acoustical Properties of the Mechanical Heart Valve Using MUSIC

MUSIC을 이용한 기계식 심장 판막의 음향 신호 특성 연구

  • Yi S. W. (Interdisciplinary Program in Biomedical Engineering Major, Seoul National University) ;
  • Choi M. J. (Department of Medicine, Medical School, Cheju National University) ;
  • Min B. G. (Department of Biomedical Engineering, College of Medicine, Seoul National University)
  • 이서우 (서울대학교 대학원 협동과정 의용생체공학전공) ;
  • 최민주 (제주대학교 의과대학 의학과) ;
  • 민병구 (서울대학교 의과대학 의공학교실)
  • Published : 1999.11.06
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Abstract

This paper considers the acoustical characteristics of the mechanical valve employed in the Korean type Artificial Heart. $Bj\"{o}rk-Shiley$ tilting disc valve was chosen for the study and acoustic measurements were performed for the artificial heart operated in a mock circulation system as well as implanted to an animal as a Bi Ventricular Assist Device (BVAD). In the mock system, three different conditions of the valve were examined which were normal, damaged (torn off), pseudothrombus attached. Microphone measurements for the BVAD were carried out at a regular time interval for 5 days after the implantation operation. Of the recorded acoustic emissions from the artificial heart, click sounds mainly originated from the valves were further analyzed using Multiple Signal Classification (MUSIC) for estimating their spectral properties. It was shown that the spectral peaks below 4 kHz and the optimal order number for MUSIC, equivalent to the number of the spectral component, might be the key parameters which were highly correlated to the physiological states of the valve like the mechanical damage of the valve or the formation of thrombus on the valves.

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