Heart pump for the circulation of blood outside the body of a living subject

A heart pump for the circulation of blood outside of the body of a living subject which comprises:

• (a) a pump body (1) made of rigid material;
• (b) a flexible tube made of elastic material through which the blood flows;
• (c) sealing means (6) disposed in the interior of the body of the pump (1) capable of dividing the internal volume of the body (1) into separate chambers (3,4,5), a segment of the flexible tube going through each of the chambers, said chambers being completely filled of an incompressible fluid;
• (d) means for preventing blockage of the flexible tube arranged in alignment with said sealing means (6) and capable of preventing the collapse of the flexible tube in the location corresponding to said sealing means;
• (e) compression means associated with the valve body (1) and communicating with its interior being capable of imparting to the fluid contained in said chamber an alternating periodic action of compression and expansion, a central body (8) within the interior of the body of the pump made of rigid material;
• and
• (f) wherein the first and the last chambers (3,5) are of length shorter than the central chamber (4), the length of the flexible tube segment (30) in said central chamber (4) being greater than the length of the flexible tube segments (21,39) respectively, in the first and last chambers (3,5), said segments of the flexible tube (21,39) in the first and the last chambers (3,5) being essentially rectilinear and the segment of the flexible tube (30) in the interior of the central chamber (4) is wound in a spiral fashion around said central body (8).