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A newly-designed myocardial assist device using a sophisticated shape memory alloy fibre

Shiraishi Y., Yambe T., Sekine K., Ogawa D., Nagatoshi J., Itoh S., Park Y., Uematsu M., Sakata R., Wada Y., Saijo Y., Higa M., Hori Y., Liu H., Wang Q., Konno S., Kuwayama T., Olegario P., Tanaka A., Masumoto N., Ibuki R., Maruyama S., Okamoto E., Fujimoto T., Yoshizawa M., Umezu M., Imachi K., Nitta S.-I., Sasada H., Tabayashi K., Homma D.

Biocybernetics and Biomedical Engineering

2007

Vol. 27, no. 1-2

147-154

Recently, the ventricular assist devices are widely applied for a surgical treatment of the final stage of severe heart failure as the bridge to heart transplantation or the destination therapy. However, it was anticipated that the artificial components in the ventricular assist devices might cause the problems concerning thrombosis and infection. As heart failure involves the decrease in myocardial contractile function, the mechanical assistance by using an artificial myocardium might be effective. In this study, the authors developed a mechano-electric artificial myocardial assist system (artificial myocardium), which is capable of supporting natural contractile function from the outside of the ventricle.

Dynamics of delaminated elements of composite and smart structures

Tylikowski A.

Zeszyty Naukowe. Mechanika / Akademia Techniczno-Rolnicza w Bydgoszczy

2002

Z. 53(241)

265-274

The purpose of this work is to show an influence of interlayer separations on dynamic behaviour of simple laminated elements of smart structures. A general bending - extensional model of the response of a simple laminated structure to excitation by a non-symmetric actuator made using piezoelectric elements is presented. Edge delamination is modelled by changing the effective length of debonded actuator. The analysis shows that the edge delamination has a harmful effect on the performance ofpiezoactuators. but the significant decrease of natural frequencies with an increase of delamination length is not observed. The dynamics and stability of rotating hybrid shafts with delamination is also presented. The composite thin-walled rotating shaft, treated as a symmetrically laminated shell, contains both the conventional (e.g. graphite or glass) angle-ply layers and the activated shape memory alloy fibres parallel to the shaft axis. The results indicate that the delamination moderately decreases the critical angular velocity.

W artykule przedstawiono wpływ oddzielania się warstw struktury kompozytowej. Uwzględniono działanie piezoelektryczne układu myślącego. Wykonano też analizę stateczności wirującego wału wykonanego z kompozytu. Stwierdzono, że delaminacja zmniejsza krytyczną prędkość kątową.