NZ793712B2 - Blood pump - Google Patents
Blood pumpInfo
- Publication number
- NZ793712B2 NZ793712B2 NZ793712A NZ79371221A NZ793712B2 NZ 793712 B2 NZ793712 B2 NZ 793712B2 NZ 793712 A NZ793712 A NZ 793712A NZ 79371221 A NZ79371221 A NZ 79371221A NZ 793712 B2 NZ793712 B2 NZ 793712B2
- Authority
- NZ
- New Zealand
- Prior art keywords
- ancillary
- impeller
- pump according
- blood pump
- blood flow
- Prior art date
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/10—Location thereof with respect to the patient's body
- A61M60/122—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body
- A61M60/126—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable via, into, inside, in line, branching on, or around a blood vessel
- A61M60/13—Implantable pumps or pumping devices, i.e. the blood being pumped inside the patient's body implantable via, into, inside, in line, branching on, or around a blood vessel by means of a catheter allowing explantation, e.g. catheter pumps temporarily introduced via the vascular system
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/20—Type thereof
- A61M60/205—Non-positive displacement blood pumps
- A61M60/216—Non-positive displacement blood pumps including a rotating member acting on the blood, e.g. impeller
- A61M60/221—Non-positive displacement blood pumps including a rotating member acting on the blood, e.g. impeller the blood flow through the rotating member having both radial and axial components, e.g. mixed flow pumps
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/20—Type thereof
- A61M60/205—Non-positive displacement blood pumps
- A61M60/216—Non-positive displacement blood pumps including a rotating member acting on the blood, e.g. impeller
- A61M60/237—Non-positive displacement blood pumps including a rotating member acting on the blood, e.g. impeller the blood flow through the rotating member having mainly axial components, e.g. axial flow pumps
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/40—Details relating to driving
- A61M60/403—Details relating to driving for non-positive displacement blood pumps
- A61M60/422—Details relating to driving for non-positive displacement blood pumps the force acting on the blood contacting member being electromagnetic, e.g. using canned motor pumps
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/80—Constructional details other than related to driving
- A61M60/802—Constructional details other than related to driving of non-positive displacement blood pumps
- A61M60/804—Impellers
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/80—Constructional details other than related to driving
- A61M60/802—Constructional details other than related to driving of non-positive displacement blood pumps
- A61M60/804—Impellers
- A61M60/806—Vanes or blades
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/80—Constructional details other than related to driving
- A61M60/802—Constructional details other than related to driving of non-positive displacement blood pumps
- A61M60/81—Pump housings
- A61M60/812—Vanes or blades, e.g. static flow guides
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/80—Constructional details other than related to driving
- A61M60/802—Constructional details other than related to driving of non-positive displacement blood pumps
- A61M60/818—Bearings
- A61M60/824—Hydrodynamic or fluid film bearings
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/80—Constructional details other than related to driving
- A61M60/802—Constructional details other than related to driving of non-positive displacement blood pumps
- A61M60/818—Bearings
- A61M60/825—Contact bearings, e.g. ball-and-cup or pivot bearings
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/80—Constructional details other than related to driving
- A61M60/802—Constructional details other than related to driving of non-positive displacement blood pumps
- A61M60/827—Sealings between moving parts
- A61M60/829—Sealings between moving parts having a purge fluid supply
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M60/00—Blood pumps; Devices for mechanical circulatory actuation; Balloon pumps for circulatory assistance
- A61M60/80—Constructional details other than related to driving
- A61M60/802—Constructional details other than related to driving of non-positive displacement blood pumps
- A61M60/827—Sealings between moving parts
- A61M60/829—Sealings between moving parts having a purge fluid supply
- A61M60/831—Sealings between moving parts having a purge fluid supply using filtered blood as purge fluid
Abstract
This invention relates to an intravascular blood pump (1), comprising a pumping device (11) with a pump section (3) and a drive section (4), wherein the pump section (3) comprises a pump casing (2) having a primary blood flow inlet (211) and a primary blood flow outlet (22) hydraulically connected by a primary passage (30) and the drive section (4) comprises a stator (40) and a rotor (41) rotatable about an axis of rotation (10) and configured to rotate a primary impeller (31), the primary impeller (31 ) being configured to convey a primary blood flow from the primary blood flow inlet (211) to the primary blood flow outlet (22) along the primary passage (30), the drive section (49) further comprises an ancillary blood flow inlet (23) and an ancillary blood flow outlet (24) hydraulically connected by an ancillary passage extending through an axial gap (401) between the rotor (41) and the stator (40) and an ancillary impeller (42) arranged at a drive section end (DSE) of the rotor (41) and rotatable about the axis of rotation (10) along with the rotor, the ancillary impeller (42) comprising one or more ancillary impeller vanes (421) configured to convey an ancillary blood flow (ABF) from the ancillary blood flow inlet (23) to the ancillary blood flow outlet (24) along the ancillary passage in a direction toward a pump section end (PSE) of the pumping device (11), and the rotor (41) is mounted in a blood-purged radial sliding rotor bearing (47) with an inner rotor bearing surface (4211) and an outer rotor bearing surface (4311), and the ancillary impeller (42) which is a radially or a radially axially delivering impeller, forms the inner rotor bearing surface (4211) of the radial sliding rotor bearing (47).
Claims (33)
1. An intravascular blood pump, comprising a pumping device with a pump section and a drive section, wherein - the pump section comprises a pump casing having a primary blood flow inlet and a primary blood flow outlet hydraulically connected by a primary passage and the drive section comprises a stator and a rotor rotatable about an axis of rotation and configured to rotate a primary impeller, the primary impeller being configured to convey a primary blood flow from the primary blood flow inlet to the primary blood flow outlet along the primary passage, - the drive section further comprises an ancillary blood flow inlet and an ancillary blood flow outlet hydraulically connected by an ancillary passage extending through an axial gap between the rotor and the stator and an ancillary impeller arranged at a drive section end of the rotor and rotatable about the axis of rotation along with the rotor, the ancillary impeller comprising one or more ancillary impeller vanes configured to convey an ancillary blood flow from the ancillary blood flow inlet to the ancillary blood flow outlet along an ancillary passage in a direction toward a pump section end of the pumping device, - the rotor is mounted in a blood-purged radial sliding rotor bearing with an inner rotor bearing surface and an outer rotor bearing surface, and - the ancillary impeller is a radially or a radially axially delivering impeller and forms the inner rotor bearing surface of the radial sliding rotor bearing.
2. The intravascular blood pump according to claim 1, wherein the inner rotor bearing surface and the rotor have a common outer diameter.
3. The intravascular blood pump according to any one of claims 1 or 2, wherein the ancillary impeller vanes each have an outer circumferential surface and wherein the inner rotor bearing surface is formed by the outer circumferential surfaces of at least two of the ancillary impeller vanes.
4. The intravascular blood pump according to any one of the preceding claims, wherein at least one of the ancillary impeller vanes protrudes axially from the ancillary impeller.
5. The intravascular blood pump according to any one of the preceding claims, wherein at least one of the ancillary impeller vanes extends radially from the ancillary blood flow inlet at least up to the axial gap.
6. The intravascular blood pump according to any one of the preceding claims, wherein at least one of the ancillary impeller vanes extends along a radial direction relative to the axis of rotation.
7. The intravascular blood pump according to any one of the preceding claims, wherein at least one of the ancillary impeller vanes forms an ancillary pump gap with an inner wall of the pump casing.
8. The intravascular blood pump according to any one of the preceding claims, wherein the ancillary impeller vanes each have an outer circumferential surface and wherein the outer circumferential surface of at least two of the ancillary impeller vanes is slanting in a radial direction so as to form a hydrodynamic sliding rotor bearing.
9. The intravascular blood pump according to any one of the preceding claims, wherein the inner rotor bearing surface comprises a radially protruding bulge with an apex of the bulge extending in a circumferential direction.
10. The intravascular blood pump according to any one of the preceding claims, wherein the inner rotor bearing surface is made of ceramic material.
11. The intravascular blood pump according to claim 10, wherein the ancillary impeller is an integral piece of ceramic material.
12. The intravascular blood pump according to any one of the preceding claims, wherein a part of the pumping device forming the outer rotor bearing surface of the radial sliding rotor is a rotor bearing ring.
13. The intravascular blood pump according to claim 12, wherein the outer rotor bearing surface is made of ceramic material.
14. The intravascular blood pump according to claim 13, wherein a part of the pumping device forms the outer rotor bearing surface.
15. The intravascular blood pump according to any one of the preceding claims, comprising an axial rotor bearing or an axial-radial rotor bearing having an axial or an axial-radial rotor bearing surface, respectively, which is arranged at the ancillary impeller.
16. The intravascular blood pump according to claim 15, wherein at least the axial or axial-radial rotor bearing surface of the ancillary impeller is made of ceramic material.
17. The intravascular blood pump according to any one of claims 10, 11, 14, 15 and 16, wherein the ceramic material is silicon carbide.
18. The intravascular blood pump according to any one of the preceding claims, wherein an axial length of the ancillary impeller is smaller than a maximum outer diameter of the ancillary impeller.
19. The intravascular blood pump according to any one of the preceding claims, wherein the primary impeller and the ancillary impeller are arranged on opposite sides of the rotor.
20. The intravascular blood pump according to any one of the preceding claims, wherein a radially outer edge of one or more of the ancillary impeller vanes is chamfered.
21. The intravascular blood pump according to any one of the preceding claims, wherein the ancillary blood flow outlet is arranged outside the primary passage.
22. The intravascular blood pump according to any one of the preceding claims, wherein the ancillary blood flow inlet comprises a plurality of ancillary inlet through- holes arranged about the axis of rotation.
23. The intravascular blood pump according to claim 22, wherein, in an interspace between two of the ancillary inlet through-holes, a wire channel for an electric supply wire for the drive section is arranged.
24. The intravascular blood pump according to claim 22 or 23, wherein the axial gap has an inlet arranged for blood to flow into the axial gap, and wherein an internal end of the ancillary inlet through-hole is arranged closer to the rotation axis in a radial direction than a radially innermost section of the inlet into the axial gap.
25. The intravascular blood pump according to any one of the preceding claims, wherein the pumping device comprises a tertiary impeller arranged for drawing the ancillary blood flow through the ancillary passage.
26. The intravascular blood pump according to claim 25, wherein the tertiary impeller is rotatable about the axis of rotation along with the rotor.
27. The intravascular blood pump according to any one of the preceding claims, wherein the ancillary blood flow outlet is arranged at a radial gap between the primary impeller and the stator.
28. The intravascular blood pump according to claim 27, wherein the ancillary blood flow outlet is arranged such that, in operation, a pumped blood flow leaving the primary blood flow outlet passes the ancillary blood flow outlet.
29. The intravascular blood pump according to claim 27 or 28, wherein a rotatable wall limiting the radial gap is rotatable along with the rotor.
30. The intravascular blood pump according to claim 29, wherein a stationary wall of the radial gap opposite to the rotatable wall of the radial gap is mechanically connected to the stator.
31. The intravascular blood pump according to any one of claims 27 to 30, when dependent on claim 26, wherein the tertiary impeller is arranged in the radial gap.
32. The intravascular blood pump according to claim 31 when dependent on claim 29, wherein the tertiary impeller comprises at least one tertiary impeller vane which protrudes from the rotatable wall of the radial gap.
33. The intravascular blood pump according to any one of claims 31 and 32, wherein an inflow to the tertiary impeller is arranged at an outflow end of the axial gap.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP20166343.2A EP3884968A1 (en) | 2020-03-27 | 2020-03-27 | Blood pump |
| PCT/EP2021/057186 WO2021191106A1 (en) | 2020-03-27 | 2021-03-22 | Blood pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| NZ793712A NZ793712A (en) | 2025-06-27 |
| NZ793712B2 true NZ793712B2 (en) | 2025-09-30 |
Family
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