Wynik wyszukiwania w bazie Polska Bibliografia Lekarska GBL

Zapytanie: UMEZU
Liczba odnalezionych rekordów: 2



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Tytuł oryginału: In vitro evaluating system for prosthetic heart valves in a case of the Jyros valve.
Autorzy: Fujimoto T., Tsutsumi Y., Shiraishi Y., Iwasaki K., Yoshida M., Umezu M., Begg J., Woodard J.
Źródło: Biocybern. Biomed. Eng. 2002: 22 (4) s.41-46, il., bibliogr. 4 poz.
Sygnatura GBL: 306,224

Hasła klasyfikacyjne GBL:
  • kardiologia

    Typ dokumentu:
  • praca doświadczalna
  • praca techniczna
  • tytuł obcojęzyczny

    Streszczenie angielskie: The Jyros valve has unique hydrodynamic characteristics comparing with other types of valves. In this study, precise hydrodynamic characteristcs of the valve were examined uisng a mock circulatory system, which we have developed. Further, the influence of leaflet rotation in the Jyros on hemolysis was evaluated. As a result, the valve rotation is shown to reduce flow resistance under the ratational flow condition which was produced by a spiral vortex pump. However, hemolysis was not revealed to be reduced by the Jyros.

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    Tytuł oryginału: Left ventricle simulator for surgeons support.
    Autorzy: Umezu Mitsuo, Arita Makoto, Iwasaki Kiyotaka, Shiraishi Yasuyuki, Tono Sumihiro, Uchida Koji
    Źródło: Biocybern. Biomed. Eng. 2002: 22 (4) s.47-53, il., bibliogr. 2 poz.
    Sygnatura GBL: 306,224

    Hasła klasyfikacyjne GBL:
  • kardiologia

    Typ dokumentu:
  • tytuł obcojęzyczny
  • praca doświadczalna

    Streszczenie angielskie: The authors have been developing various types of mock circulatory systems to evaluate a performance of artificial organs. Among several attempts, it was indicated that a stimulation of the mitral valve region was very difficult due to a complicated shape and movement of the valve. In this paper a new trial to install a porcine valve into the mock circulatory systemis introduced. A fresh porcine valve with papillary muscles and chordae was fixed into the mitral position of the modified Windkessel-type mock circulatory system. To allow direct 3-D observation of the mitral annulus, a digital video camera and a laser displacement sensor were employed. A circulation was generated by a pneumatically-driven artificial ventricle. When a normal circulatory condition (pump rate: 70BPM, Flow: 3L/min) was selected, similar opening and closing motion to the natural mitral valve could be reproduced. Moreover, a diseases condition was made by shifting a position of papillary muscles. After this procedure, an abnormal movement, such as significant leakage, could also be reproduced.

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