Axial-flow pump for a ventricular assist device and method for producing an axial-flow pump for a ventricular assist device

A cardiac support system for insertion through a catheter into a blood vessel, comprising:

• an axial flow pump comprising:
• a tube-shaped pump housing having an axis of rotation extending therethrough;
• and
• a pump rotor extending in the pump housing and being rotatable about the axis of rotation, the pump rotor comprising a hub and a blade element, the blade element being wound at least in sections helically around the hub and configured to axially draw blood into the pump housing in a direction toward the hub;
• wherein the pump housing further comprises:
• a pump intake section upstream of the pump rotor and configured to receive the blood drawn into the pump housing, the pump intake section being penetrated by the axis of rotation;
• and
• at least one peripheral outlet opening configured to laterally discharge the blood drawn into the pump housing;
• and
• wherein the at least one blade element has a profile with camber lines, wherein a curvature of each of the camber lines when unwound into a plane increases along the axis of rotation in a direction starting from the pump intake section towards the outlet opening to an inflection point at which a blade angle (β) of the blade element is at a maximum, and wherein the curvature of each of the camber lines decreases after the inflection point;
• wherein, in a region of the pump rotor located radially relative to the axis of rotation and having a blade height SH of the at least one blade element defined relative to a maximum blade height SHMAX such that 25%≤SH/SHMAX≤100%, the inflection point of each of the camber lines is located in a region of an upstream edge of the outlet opening.

A cardiac support system for insertion through a catheter into a blood vessel, comprising:

• an axial flow pump comprising:
• a pump rotor being rotatable about an axis of rotation, the pump rotor comprising a hub and a blade element, the blade element being wound at least in sections helically around the hub and configured to axially draw blood into the pump in a direction toward the hub;
• at least one peripheral outlet opening configured to laterally discharge the blood drawn into the pump;
• and
• wherein the at least one blade element has a profile with camber lines, wherein a curvature of each of the camber lines when unwound into a plane increases along the axis of rotation in a direction starting from an upstream end of the rotor towards the outlet opening to an inflection point at which a blade angle (β) of the blade element is at a maximum, and wherein the curvature of each of the camber lines decreases after the inflection point;
• wherein, in a region of the pump rotor located radially relative to the axis of rotation and having a blade height SH of the at least one blade element defined relative to a maximum blade height SHMAX such that 25%<SH/SHMAX≤100%, the inflection point of each of the camber lines is located in a region of an upstream edge of the outlet opening.