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US 6,007,479 AGranted
Heart assist system and method
AssigneeH.D.S. Systems Ltd.
InventorsDan Rottenberg, Dudu Haimovich
Life of this patent
Estimating the term…
Abstract
A cardiac assist device includes a cannula with intake and outflow valve in the distal end portion is positioned in a bloodstream. A diaphragm in the proximal portion of the cannula, powered by external pressure-producing mechanism, forms a reservoir to exert pressure on the cannula volume at the valves to effect blood flow assistance to the patient's heart.
Claims29
A cardiac assist pump, comprising:
- a cannula, comprising an outer sheath, which defines and encloses a lumen therein, said cannula having a distal end and a proximal end, wherein the cannula is adapted and configured so that it is capable of being inserted through the aorta of a subject so that the distal end is inside a ventricle of the heart of said subject;
- 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 hydraulic pump, coupled to the fluid reservoir and applying hydraulic forces to the reservoir to control the fluid volume in said reservoir;
- wherein the pump mechanism alternately increases and decreases the fluid volume in the reservoir to produce a pulsatile pumpincg action of blood through the cannula.
4 more elements
A method for augmenting the blood output of the heart, comprising:
- connecting a cannula, having distal and proximal ends and having intake and outlet valves, to a fluid reservoir at the proximal end of the cannula;
- inserting the cannula through an artery, so that the distal end of the cannula is inside the left ventricle of the heart;
- applying hydraulic forces to the reservoir such that:
- blood is drawn from the ventricle, through the intake valve of the cannula and into the fluid reservoir, by reducing a fluid pressure in said reservoir;
- and
- blood is elected from the reservoir through the outlet valve of the cannula and into the artery.
3 more elements
Dependencies are inferred from the claim text.