대한의용생체공학회:학술대회논문집 (Proceedings of the KOSOMBE Conference)

대한의용생체공학회 (The Korean Society of Medical and Biological Engineering)
권호 표지

정상유동에서 유동형 단엽폴리머 인공심장판막의 수력학적 성능평가

Hydrodynamic Investigation of a Floating-type Monoleaflet Polymer Heart Valve under Steady Flow Condition

  • 박복춘 (전북대학교 공과대학 기계공학부) ;
  • 김준우 (전북대학교 공과대학 기계공학부) ;
  • 백병준 (전북대학교 공과대학 기계공학부) ;
  • 민병구 (서울대학교 의과대학 의공학과)
  • Pak, Bock-Choon (School of Mechanical Engineering, Chonbuk National University) ;
  • Kim, Joon-Woo (School of Mechanical Engineering, Chonbuk National University) ;
  • Baek, Byoung-Joon (School of Mechanical Engineering, Chonbuk National University) ;
  • Min, Byoung-Goo (Department of Biomedical Engineering, Seoul National University)
  • 발행 : 1995.05.12
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초록

An experimental investigation was performed under steady flow condition to assess hydrodynamic performance of floating-type monoleaflet polymer valves (MLPV) with different leaflet thickness. The St. Jude Medical valve (SJMV) was also used for comparison tests. Pressure drops of MLPVs are larger than those for other types of polymer valves and mechanical valves. Furthermore, the thicker is the leaflet thickness of a polymer valve, the larger arc the corresponding press drop. The velocity profiles for MLPV reveal a large reversed flow region downward to the valve position. The maximum wall shear stresses of MLPVs at a flow rate of 30 l/min are in the range $54-130\;dyn/cm^2$, and the corresponding maximum. Reynolds shear stresses are in the range of $100-500\;dyn/cm^2$, respectively. Both arc beyond the allowable limit clinically. In contrast, floating-type monoleaflet polymer valves show better hydrodynamic performance in leakage volume. From the designing point of view, it can be concluded that the optimum thickness of leaflet for better hydrodynamic performance is one of the important parameters.

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