# US 11,298,520 B2 · Impeller for use with axial shaft > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,298,520 B2 - Document ID: US11298520B2 - Status: Granted - Kind: B2 - Application number: 16/682,016 - Filed: 2019-11-13 - Published: 2020-03-12 - Granted: 2022-04-12 - Earliest claimed: 2013-03-13 - Assignees: Magenta Medical Ltd. - Applicants: Magenta Medical Ltd. - Inventors: Ehud Schwammenthal; Yosi Tuval; Daniel Glozman - Web page: https://patentgrep.com/patent/US11298520B2 ## CPC - A61F 2/07: Stent-grafts - A61B 5/02055: {Simultaneously evaluating both cardiovascular condition and temperature} - 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 60/237: the blood flow through the rotating member having mainly axial components, e.g. axial flow pumps - A61M 60/33: of kidneys - A61M 60/411: generated by an electromotor - A61M 60/422: the force acting on the blood contacting member being electromagnetic, e.g. using canned motor pumps - A61M 60/523: using blood flow data, e.g. from blood flow transducers - A61M 60/808: specially adapted for deformable impellers, e.g. expandable impellers - A61M 60/81: Pump housings - A61M 60/825: Contact bearings, e.g. ball-and-cup or pivot bearings - A61M 60/833: Occluders for preventing backflow - A61M 60/861: Connections or anchorings for connecting or anchoring pumps or pumping devices to parts of the patient's body - A61M 60/148: in line with a blood vessel using resection or like techniques, e.g. permanent endovascular heart assist devices - A61M 60/414: transmitted by a rotating cable, e.g. for blood pumps mounted on a catheter - A61M 60/896: having flexible or resilient parts, e.g. flap valves - A61M 2207/00: Methods of manufacture, assembly or production - A61M 2210/1082: Kidney - A61M 2210/12: Blood circulatory system - A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C) - A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D) - 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)} ## Abstract Apparatus and methods are described including an impeller that includes an impeller frame that comprises proximal and distal end portions and at least one helical elongate element that winds from the proximal end portion to the distal end portion. A film of material is coupled to the at least one helical elongate element, such that the helical elongate element with the film of material coupled thereto defines a blade of the impeller. The film of material is shaped to define a hollow central lumen therethrough. Other applications are also described. ## Claims ### Claim 1 Apparatus comprising: an impeller, comprising: an impeller frame that comprises proximal and distal end portions and at least one helical elongate element that winds from the proximal end portion to the distal end portion; and a film of material that is coupled to the at least one helical elongate element, such that the at least one helical elongate element with the film of material coupled thereto defines a blade of the impeller, the film of material being shaped to define a hollow central lumen therethrough; and an axial support member that passes through the hollow central lumen and is configured to support the impeller. ### Claim 2 (depends on 1) The apparatus according to claim 1, wherein the at least one helical elongate element comprises three helical elongate elements that wind from the proximal end portion to the distal end portion, and wherein the film of material is coupled to the helical elongate elements, such that each of the helical elongate elements with the film of material coupled thereto defines a respective blade of the impeller. ### Claim 3 (depends on 1) The apparatus according to claim 1, wherein the at least one helical elongate element comprises two helical elongate elements that wind from the proximal end portion to the distal end portion, and wherein the film of material is coupled to the helical elongate elements, such that each of the helical elongate elements with the film of material coupled thereto defines a respective blade of the impeller. ### Claim 4 A method, comprising: manufacturing an impeller by coupling a material to a structure that defines at least one helical elongate element, such that the at least one helical elongate element with the material coupled thereto defines a blade of the impeller, shaping the material such that the material defines a hollow central lumen therethrough, and inserting an axial support member through the hollow central lumen, the axial support member being configured to support the impeller. ### Claim 5 (depends on 4) The method according to claim 4, wherein the structure defines three helical elongate elements, and coupling the material to the at least one helical elongate element, comprises coupling the material to the three helical elongate elements, such that each of the elongate elements with the material coupled thereto defines a respective blade of the impeller. ### Claim 6 (depends on 4) The method according to claim 4, wherein the structure defines two helical elongate elements, and coupling the material to the at least one helical elongate element, comprises coupling the material to the two helical elongate elements, such that each of the elongate elements with the material coupled thereto defines a respective blade of the impeller. ### Claim 7 (depends on 4) The method according to claim 4, wherein coupling the material to the structure that defines the at least one helical elongate element comprises: dipping at least a portion of the structure into the material while the material is in a liquid state; drying the material, while the material is being supported by the at least one helical elongate element; and during the drying of material, rotating the structure about its longitudinal axis, such as to facilitate the formation of a film of the material having a substantially uniform thickness, at least within the impeller blade. ### Claim 8 (depends on 4) The method according to claim 4, further comprising forming the structure that defines the at least one helical elongate element by: cutting a tube such that the cut tube defines an initial structure having first and second end portions at proximal and distal ends of the initial structure, the end portions being connected to one another by at least one elongate element; and causing the at least one elongate element to radially expand and form at least one helical elongate element, at least partially by axially compressing the initial structure. ### Claim 9 (depends on 8) The method according to claim 8, wherein causing the at least one elongate element to radially expand and form at least one helical elongate element, further comprises twisting the initial structure.