Initial hydrodynamic study on a new intraaortic axial flow pump: Dynamic aortic valve

Citation
Gr. Li et al., Initial hydrodynamic study on a new intraaortic axial flow pump: Dynamic aortic valve, SCI CHINA C, 44(2), 2001, pp. 199-206
Citations number
13
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Experimental Biology
Journal title
SCIENCE IN CHINA SERIES C-LIFE SCIENCES
ISSN journal
1006-9305 → ACNP
Volume
44
Issue
2
Year of publication
2001
Pages
199 - 206
Database
ISI
SICI code
1006-9305(200104)44:2<199:IHSOAN>2.0.ZU;2-O
Abstract
Rotary blood pumps have been researched as implantable ventricular assist d evices for years. To further reduce the complex of implanted axial pumps, t he authors proposed a new concept of intraaortic axial pump, termed previou sly as "dynamic aortic valve (DAV)". Instead of being driven by an intraaor tic micro-electric motor, it was powered by a magnetic field from outside o f body. To ensure the perfusion of coronary artery, the axial flow pump is to be implanted in the position of aortic valve. It could serve as either a blood pump or a mechanical valve depending on the power input. This resear ch tested the feasibility of the new concept in model study. A column, made from permanent magnet, is jointed to an impeller in a concentric way to fo rm a "rotor-impeller". Supported by a hanging shaft cantilevered in the cen ter of a rigid cage, the rotor-impeller can be turned by the magnetic field in the surrounding space. In the present prototype, the rotor is 8 mm in d iameter and 15 mm in length, the impeller has 3 vanes with an outer diamete r of 18 mm. The supporting cage is 22 mm in outer diameter and 20 mm in len gth. When tested, the DAV prototype is inserted into the tube of a mock cir cuit. The alternative magnetic field is produced by a rotating magnet place d side by side with the rotor-impeller at a distance of 30 mm. Once the alt ernative magnetic field is presented in the surrounding space, the DAV star ts to turn, leading to a pressure difference and liquid flow in the tube. T he flow rate or pressure difference is proportioned to rotary speed. At the maximal output of hydraulic power, the flow rate reached 5 L/min against a n afterload of 100 mmHg. The maximal pressure difference generated by DAV a t a rotation rate of 12600 r/min was 147 mmHg. The preliminary results demo nstrated the feasibility of "DAV", further research on this concept is just ifiable.