# US 2021/0330958 A1 · Axial-flow pump for a ventricular assist device and method for producing an axial-flow pump for a ventricular assist device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0330958 A1 - Document ID: US20210330958A1 - Status: Published application - Kind: A1 - Application number: 17/057,252 - Filed: 2019-05-30 - Published: 2021-10-28 - Earliest claimed: 2018-05-30 - Assignees: Kardion GmbH - Applicants: Kardion GmbH - Inventors: Ingo Stotz; Niko Baeuerle - Web page: https://patentgrep.com/patent/US20210330958A1 ## CPC - A61M 60/237: the blood flow through the rotating member having mainly axial components, e.g. axial flow pumps - F04D 29/183: {Semi axial flow rotors} - A61M 60/13: by means of a catheter allowing explantation, e.g. catheter pumps temporarily introduced via the vascular system - A61M 60/135: inside a blood vessel, e.g. using grafting - A61M 60/178: drawing blood from a ventricle and returning the blood to the arterial system via a cannula external to the ventricle, e.g. left or right ventricular assist devices - A61M 60/221: the blood flow through the rotating member having both radial and axial components, e.g. mixed flow pumps - A61M 60/806: Vanes or blades - A61M 60/861: Connections or anchorings for connecting or anchoring pumps or pumping devices to parts of the patient's body - F04D 3/02: of screw type - A61M: DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY (introducing media into or onto the bodies of animals A61D7/00; means for inserting tampons A61F13/26; devices for administering food or medicines orally A61J; containers for collecting, storing or administering blood or medical fluids A61J1/05); DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY (surgery A61B; chemical aspects of surgical articles A61L); DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR {(Electrotherapy, e.g. producing anaesthesia by the use of alternating or intermittent currents A61N1/36021)} - F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02) ## Abstract The invention relates to an axial flow pump (102) for a ventricular assist device. The axial flow pump (102) comprises a pump housing (104) for arranging in a blood vessel and a pump rotor (108), which is or can be mounted in the pump housing (104) for rotation about an axis of rotation and which consists of a hub (200) and at least one blade element (110) which is helically wound around the hub (200), at least in portions, and is provided for conveying, in the direction of the axis of rotation (302), a medium to be conveyed. In order to increase the pump efficiency, the blade element (110) has at least one blade section (202) having an undulating blade curvature. ## Claims ### Claim at position 1 1-18. (canceled) ### Claim 19 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. ### Claim 20 (depends on 19) The cardiac support system according to claim 19, wherein the at least one blade element comprises at least one blade section having a wavy blade curvature. ### Claim 21 (depends on 20) The cardiac support system according to claim 20, wherein the at least one blade section having the wavy blade curvature is configured in a section of the pump rotor at least partially located in a housing section of the pump housing open to the at least one outlet opening. ### Claim 22 (depends on 20) The cardiac support system according to claim 20, wherein the wavy blade curvature varies in a direction of a radial extension of the at least one blade section. ### Claim 23 (depends on 20) The cardiac support system according to claim 20, wherein the wavy blade curvature increases with increasing radial distance from the axis of rotation. ### Claim 24 (depends on 20) The cardiac support system according to claim 20, wherein the at least one blade element has a thickness that changes along the axis of rotation in the at least one blade section having the wavy blade curvature. ### Claim 25 (depends on 19) The cardiac support system according to claim 19, wherein the hub faces a distal end of the cardiac support system. ### Claim 26 (depends on 19) The cardiac support system according to claim 19, wherein the hub has a diameter that increases along the axis of rotation in the direction starting from the pump intake region towards the outlet opening. ### Claim 27 (depends on 19) The cardiac support system according to claim 19, wherein the blade angle (β) is measured relative to a line perpendicular to the axis of rotation, ### Claim 28 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%