대한의용생체공학회:의공학회지 (Journal of Biomedical Engineering Research)

  • 제13권4호
  • /
  • Pages.285-298
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  • 1992
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  • 1229-0807(pISSN)
  • /
  • 2288-9396(eISSN)
대한의용생체공학회 (The Korean Society of Medical and Biological Engineering)
권호 표지

Impact Behavior Analysis of a Mechanical Monoleaflet Heart Valve Prosthesis in the Closing Phase

  • Cheon, Gill-Jeong (Department of Mechanical Engineering, Won-Kwang University) ;
  • Chandran, K.B. (Department of Biomedical Engineering University of Iowa)
  • 발행 : 1992.12.01
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초록

An analysis of the dynamics in the closing phase of the occluder of a mechanical monoleaflet heart valve prosthesis is presented. The dynamic analysis of the fluid in the vicinity of the occluder was based on the control vo]use approach. The backflow velocity of the fluid was computed by applying the continuity, Bernoulli's and momentum equations in the unsteady state. By considering the fluid pressure and gravity as external forces acting on the occluder, the moment equilibrium on fine occluder was employed to analyze the motion of the occluder during closing and the force of impact between the occluder and the guiding struts. Occluder comes to rest after several oscillations in about 10-18 msec after the Inltiaton of closing. As the aortic pressure increases, the occludes closes faster and comes to the final resting position earlier and the impact force increases also. But backflow is not af footed by the variation of the aortic pressure. With decreasing time delay of the ventricle pressure, the occluder closes faster and impact force Increases. The computed magnitudes of the occluder tiP velocities as well as the backflow of the fluid during the closing phase using this model were in agreement with previously reported experimental measurements.

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참고문헌

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