Heart assist system

A - Human Necessities – 61 – M

Patent

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Details

A61M 1/10 (2006.01) A61M 25/00 (2006.01) F16K 15/00 (2006.01) F16K 31/12 (2006.01)

Patent

CA 2226491

A cardiac assist pump, including: a cannula, including an outer sheath, which defines and encloses a lumen therein, the cannula having a distal end and a proximal end. The cannula is inserted through the aorta of a subject so that the distal end is inside a ventricle of the heart of said subject. The pump includes at least one intake valve, adjacent to the distal end of the cannula, through which blood enters the lumen from the ventricle; at least one outlet valve, disposed radially along the sheath of the cannula, through which blood exits the lumen into the aorta; a fluid reservoir having a variable fluid volume, connected to the proximal end of the cannula, such that blood may flow between the lumen and the reservoir; and a pump drive, coupled to the fluid reservoir and controlling the fluid volume in the reservoir. The pump drive alternately increases and decreases the fluid volume in the reservoir to produce a pulsatile pumping action of blood through the cannula.

Pompe d'assistance cardiaque comprenant: une canule pourvue d'une gaine externe formant et renfermant un lumen, la canule ayant une extrémité distale et une extrémité proximale. Cette canule est introduite dans l'aorte d'un patient de sorte que son extrémité distale se trouve à l'intérieur d'un ventricule cardiaque. La pompe comprend au moins un clapet d'admission, adjacent à l'extrémité distale de la canule, par lequel le sang pénètre dans le lumen du ventricule; au moins un clapet d'évacuation, placé radialement le long de la gaine de la canule, par lequel le sang sort du lumen pour passer dans l'aorte; un réservoir de fluide ayant un volume de fluide variable, raccordé à l'extrémité proximale de la canule, de sorte que le sang puisse s'écouler entre le lumen et le réservoir; et un circuit de commande de pompe, couplé au réservoir de fluide et commandant le volume de fluide dans le réservoir. Le mécanisme de commande de la pompe augmente et diminue alternativement le volume du fluide dans le réservoir et produit une action de pompage pulsatoire du sang dans la canule.

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