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The Effect of Pulsatile Flow on Ultrafiltration In-Vitro Study and Comparison with Roller Pump

  • Lee K.;Jeong J. H.;Mun C. H.;Lee J. C.;Min B. G.
    • Journal of Biomedical Engineering Research
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    • v.26 no.5
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    • pp.337-341
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    • 2005

  • Blood pulsation has been reported to have an advantageous effect on extracorporeal blood circulation. However, the study of pulsatile blood flow in renal replacement therapy is very limited. The in-vitro experimental results of pulsatile blood flow on ultrafiltration, when compared with the conventional roller pump, are described in this paper. Methods: Blood flow rate (QB) and transmembrane pressure (TMP) were considered as regulating factors that have an influence on ultrafiltration. Experiments were performed under the condition of equal TMP and OB in both pulsatile and roller pump groups, Several kinds of hollow fiber dialyzers were tested using distilled water containing chemicals as a blood substitute. Mean TMP (mTMP) varied from 10 to 90mmHg while the QB was 200ml/min. Results: Ultrafiltration rate (QUF) was found to be linearly proportional to TMP, whereas QB had little influence on QUF. In addition, QUF was higher in the pulsatile group than the roller pump group at the identical TMP. Conclusion: In the controlled test, QUF increased solely as a consequence of blood pulsation, which implies that the pulse frequency represents an additional and important clinical variable during renal replacement therapy.

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Quenching rate controlled Laser Annealing (QLA) for poly-Si TFT fabrication

  • Han, Gyoo-W.;Alexander, Voronov;Ryu, S.G.;Kim, H.S.;Roh, C.L.
    • 한국정보디스플레이학회:학술대회논문집
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    • 2005.07b
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    • pp.897-897
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    • 2005

  • We report QLA (Quenching-rate controlled Laser Annealing) system as new concept using pulsed DPSSL and CW lasers. This process can control temperature quenching-rate of poly-Si crystallization by additional CW laser and fabricate high quality poly-Si with faster scanning speed than conventional processes. In this paper, QLA system, the experimental results and theoretical discussion will be introduced.

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