Key result
The NEDO Biventricular Assist Device with an RPM impeller suspension system achieved survival up to 90 days in bovine models, with no thrombus observed except in one pump due to outflow kinking.
Why the study?
Does the NEDO BVAD with an RPM dynamic impeller suspension system prevent thrombus formation in bovine models?
Does the NEDO BVAD with an RPM dynamic impeller suspension system prevent thrombus formation in bovine models?
The RPM dynamic impeller suspension system in the NEDO BVAD demonstrated antithrombogenic effects in bovine models, supporting its potential for long-term mechanical circulatory support.
RPM suspension may reduce thrombosis in preclinical BVAD models; leaves open translation to human long-term support.
Since 1995, the Baylor College of Medicine group has been developing the NEDO Gyro permanent implantable (PI) pump. The Gyro PI pump has achieved outstanding results up to 284 days with no thrombus formation during the left ventricular assist device (LVAD) animal experiments. However, in biventricular assist device (BVAD) animal experiments, thrombus formation did occur. An in vitro experiment showed the reason for thrombus formation was caused by the missed magnetic balance between the impeller and the actuator. On the basis of this result, the revolutions per minute (RPM) impeller suspension system was developed. Six long-term animal studies were performed in bovine models. Survival periods were 90, 80, 60, 51, 48, and 37 days, respectively. No thrombus was observed in the pumps with the exception of one right pump. In that experiment, the thrombus formation may have occurred when the pump had a low flow because of outflow kinking. In this article, the antithrombogenic effect of this RPM impeller suspension system will be discussed.
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Ichikawa et al. (2003) studied Biventricular assist device evaluation (n=6). NEDO Biventricular Assist Device with RPM Dynamic Impeller Suspension System was evaluated on Survival and thrombus formation. The NEDO Biventricular Assist Device with an RPM impeller suspension system achieved survival up to 90 days in bovine models, with no thrombus observed except in one pump due to outflow kinking.
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