Method for controlling an assist pump for fluid delivery...

F - Mech Eng,Light,Heat,Weapons – 04 – D

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F04D 15/00 (2006.01) F04D 3/00 (2006.01) F04D 13/06 (2006.01)

Patent

CA 2419507

Method for controlling an assist pump for fluid delivery systems with pulsatile pressure. If for example a heart assist pump is driven with a constant number of revolutions, it is achieved, that the blood is also delivered through the assist pump, even when the heart chamber is in the decontraction phase. With the present method it is achieved, that an assist pump only acts supportingly in the pressure phase of the main pump, in such a way, that the pressure difference between the input side and the output side of the assist pump is continuously determined and the number of revolutions of the assist pump is controlled in such a way, that the determined pressure difference does not fall below a predetermined value and the rate of flow does not sink below zero.

La présente invention concerne un procédé pour réguler une pompe d'assistance pour systèmes de refoulement de fluide à pression pulsée. Si, par exemple, une pompe d'assistance cardiaque est entraînée à un régime constant, le sang continue à être refoulé à travers cette pompe d'assistance cardiaque même lorsque le ventricule cardiaque se trouve en phase de décontraction. Le procédé selon cette invention permet qu'une pompe d'assistance cardiaque n'apporte une assistance que lors de la phase de compression de la pompe principale. Ce procédé consiste à déterminer en permanence la différence de pression entre un côté d'entrée et un côté de sortie de la pompe d'assistance cardiaque et le débit qui passe à travers cette même pompe d'assistance cardiaque, puis à réguler le régime de la pompe d'assistance cardiaque de façon que la différence de pression déterminée ne tombe pas sous une valeur prédéfinie et que le débit ne descende pas en-dessous de zéro.

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