WO2020146821A1 - Palier à balayage passif pour turbomachine cardiovasculaire - Google Patents

Palier à balayage passif pour turbomachine cardiovasculaire Download PDF

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Publication number
WO2020146821A1
WO2020146821A1 PCT/US2020/013216 US2020013216W WO2020146821A1 WO 2020146821 A1 WO2020146821 A1 WO 2020146821A1 US 2020013216 W US2020013216 W US 2020013216W WO 2020146821 A1 WO2020146821 A1 WO 2020146821A1
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WO
WIPO (PCT)
Prior art keywords
bearing
blood
rotating member
journal
axisymmetric
Prior art date
Application number
PCT/US2020/013216
Other languages
English (en)
Inventor
Gregory W. Burgreen
Original Assignee
Burgreen Gregory W
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Burgreen Gregory W filed Critical Burgreen Gregory W
Publication of WO2020146821A1 publication Critical patent/WO2020146821A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/046—Bearings
    • F04D29/047—Bearings hydrostatic; hydrodynamic
    • 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
    • A61M60/226—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 radial components
    • A61M60/232—Centrifugal 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
    • A61M60/10—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
    • 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
    • A61M60/148—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 in line with a blood vessel using resection or like techniques, e.g. permanent endovascular heart assist devices
    • 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
    • A61M60/80—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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/06—Lubrication
    • F04D29/061—Lubrication especially adapted for liquid pumps

Definitions

  • This invention relates to the field of cardiovascular turbomachinery for humans and animals and, more specifically, to a novel method, system, and apparatus for providing passively flushed simple bearings and cavities for cardiovascular turbomachinery for pumping blood and other biological fluids for humans and animals in need thereof.
  • the invention provides for long- term high speed rotor rotation therein through enhancement of blood flow and/or fluid flow past simple bearings, for the convective removal of heat build-up away from the bearings, and for the mitigation of thrombus formations in or near the region of the simple bearing(s).
  • Cardiovascular turbomachinery is used in a variety of medical therapies including ventricular assist, cardiopulmonary bypass, and percutaneous transfer of blood that transfers dissolvable gases into and out of the human or animal circulation.
  • turbomachines may be used to pump blood for a particular therapeutic process.
  • Simple bearings involve a rotating shaft whose end is mated with a very small tolerance to a corresponding mating end of a stationary component that physically constrains the lateral motion of the rotating shaft.
  • Simple bearings include pivot, pin, journal, and ball-and-cup bearings, for example. Due to the small tolerance (close fit) of the mated bearing surfaces, heat can be generated from direct frictional contact as well as viscous fluid heating.
  • Thrombosis often occurs adjacent to simple bearings for three main reasons: (1) prolonged blood flow stagnation (i.e., flow stasis), (2) elevated local concentration of pro- thrombotic chemical species due to an inadequate degree of convective flushing associated with flow stasis, and (3) an elevated thermal environment due to an inadequate degree of convective cooling associated with flow stasis.
  • Regions of flow stagnation tend to collect activated platelets and high concentrations of biochemical agonists that further activate additional platelets.
  • High thermal fields act to denature proteins in blood plasma. Given one or both of these phenomena, the region adjacent to simple bearings subjected to flow stasis becomes a positive feedback reactor site that can quickly generate thrombosis and/or a mass of denatured proteins.
  • bearing seizure resulting from dried blood and/or denatured proteins sticking to bearing surfaces (2) increased power consumption due to blood and/or denatured proteins sticking to bearing surfaces; and (3) the breaking off (embolization) of small pieces from the thrombus and/or from the mass of denatured proteins, which increases risk of stroke events in patients.
  • Increases of hemolysis generation are often associated with thrombus or mass of denatured proteins having formed at a simple bearing.
  • U.S. Pat. No. 4,606,698 discloses an open bladed centrifugal blood pump with long blades and a set of shorter blades that are supported by a circular flange. Large open wash-out holes are formed between the rotor hub and the circular flange. While the bearing used in this particular pump design consists of two ball bearings, not simple bearing(s), blood flow past the rotor seal is enhanced by the large wash-out holes.
  • U.S. Pat. No. 5,458,459 discloses a centrifugal blood pump with a simple journal bearing.
  • Tire device has a single, large central wash-out hole and curved floor below the rotor to enhance flow past the lower simple bearing.
  • U.S. Pat. No. 5,746,575 discloses a centrifugal blood pump with ball-and-cup simple bearings support.
  • the device has a carefully designed uniform thickness gap beneath the rotor hub and the stationary housing floor that encourages secondary flows that enhance the washing of the lower simple bearing.
  • U.S. Pat. No. 5,957,672 discloses an axial flow blood pump that has a rotor supported by two simple bearings.
  • the device has two circumference gaps surrounding simple bearings, a first gap located at the inlet between the rotor end wall and the stationary flow straightener end wall, and a second gap located at the outlet between the rotor end wall and the aft stator end wall.
  • the gap widths and depths have been systematically varied and selected to minimize flow stasis in both gaps.
  • U.S. Pat. No. 6,116,862 discloses a centrifugal blood pump with simple ball-and-cup bearings.
  • the device has a tapered gap beneath the rotor hub and a stationary motor face.
  • the gap clearance is small near the bearing and grows larger with radial distance.
  • the purpose of the lower gap is to enhance secondary flow washing of the simple lower bearing. It is reported in publication Gobel et al. (2001) that wash-out holes adjacent to the bearing were cut to the rotor to further assist blood flow past the lower bearing and eliminate blood stasis.
  • U.S. Pat. Application Pub. 2005/0107657 discloses an axial flow blood pump with simple pin bearings.
  • the device defines a gap surrounding the simple bearing at the inlet composed of a hemispherically-shaped stationary surface and a smaller diameter hemispherically-shaped rotor nose. Secondary flow is envisioned to enhance the washing of the simple bearing.
  • U.S. Pat. Application Pub. 2011/0238172 discloses a diagonal flow blood pump having a magnetically-suspended rotor. Relevant to this device is the presence of diagonally-inclined wash-out holes cut through the impeller and designed to transport blood away from a dead flow region below' the center of the rotor in a secondary flow path with pancake volume.
  • U.S. Pat. Application Pub. 2014/0296615 discloses a centrifugal blood pump with simple ball-and-cup bearings. Vertically-oriented cylindrical wnsh-out holes are cut through the rotor and are positioned close to the lower bearing. The wash-out holes are supplied with blood via a non-curved secondary flow gap below the rotor.
  • U.S. Pat. No. 9,162,018 discloses a centrifugal blood pump with a single simple ball-and- cup bearing.
  • This device has a secondary flow path that constitutes a smooth, continuous circumferential transition between the stationary lower bearing piece and the rotating upper bearing piece.
  • the smooth, continuous circumferential shape is offset by a constant gap thickness to form a secondary flow path that directly washes the simple bearing.
  • the stated goal of this device is to provide for smooth, unhindered flow that is free from areas that could undesirably cause flow stasis and consequently thrombus.
  • U.S. Pat. Application Pub. 2016/0121034 discloses a centrifugal blood pump with a single simple ball-and-cup bearing.
  • This device has a secondary flow path that constitutes a smooth, continuous circumferential transition between the stationary lower bearing piece and the rotating upper bearing piece.
  • the smooth, continuous circumferential shape is offset by a constant gap thickness to form a secondary flow path that directly washes the stationary piece of the simple bearing.
  • the rotating piece of the simple bearing has precise grooves machined into the bearing material to provide multiple small pathways for blood to directly flow over the entirety of the stationary lower bearing surface and exit the upper bearing piece.
  • the present invention provides distinctive and novel methods, systems, and apparatus not found in existing technologies. Moreover, the invention utilizes a passively flushed bearing cavity that supports long-term, high speed rotor rotation and enhancement of blood flow past simple bearings, as well as the convective removal of any built-up heat and other features and components that make the method and system of the invention unique.
  • the present invention provides a novel method, system, and apparatus comprising a passively flushed bearing for cardiovascular turbomachinery used to pump blood and other fluids and, specifically, a passively flushed bearing cavity for supporting long-term, high speed rotor rotation via enhancement of blood flow past simple bearings and convective removal of heat build-up.
  • the invention comprises a passive bearing pump assembly system and apparatus for a cardiovascular turbomachine that is suitable for implementing within a human and/or an animal in need thereof.
  • the invention mitigates the problem of blood clotting in blood transporting turbomachines by, among other advantages, providing novel shape changes using simple bearings that passively flush blood away from the bearing(s), thereby enhancing convective blood flow adjacent to the bearing(s), decreasing thermal heating of the bearing(s), and mitigating thrombus formations in the bearing/ s) region.
  • FIG. 1 shows a cutaway view of the notional centrifugal flow turbomachine with a ball- and-cup bearing, all of the present invention.
  • FIG. 2 shows a cutaway view of the notional axial flow turbomachine supported by two simple journal bearings, all of the present invention.
  • FIG. 3 shows a cutaway view of the notional centrifugal flow turbomachine that has the key shape modifications to enhance the washing of the simple bearing and the passive flushing of blood from the cavity surrounding the bearing, all of the present invention.
  • FIG. 4 shows a cutaway view of the notional axial flow turbomachine that has the key shape modifications to enhance the washing of both the front and aft simple journal bearings and the passive flushing of blood from the cavity surrounding each bearing, all of the present invention.
  • FIG. 5 shows a cutaway view of the notional centrifugal flow turbomachine having one of many alternative embodiments of the key shape modifications to enhance the washing of the simple bearing and the passive flushing of blood from the cavity surrounding the bearing, all of the present invention.
  • FIG. 6 shows a cutaway view of the notional centrifugal flow turbomachine having another of one of many alternative embodiments of the key shape modifications to enhance the washing of the simple bearing and the passive flushing of blood from the cavity surrounding the bearing, all of the present invention.
  • the present invention relates generally to cardiovascular turbomachinery used to pump blood and/or other biological fluids. More specifically, the present invention relates to and provides a novel method, system, and apparatus, for implementing within humans and/or animals in need thereof, for a passively flushed bearing pump assembly system and apparatus for a cardiovascular turbomachine.
  • the system and components are situated within a recessed cavity for supporting long-term, high speed rotor rotation via enhancement of blood flow past simple bearings and convective removal of heat or thermal heat build-up.
  • the novelty of the invention pertains to the inclusion of a recessed cavity situated around the simple bearing(s) in which blood is drawn into the cavity via centrifugal suction developed by a plurality of outflow ports that rotate with the rotor component(s) of the pump.
  • Blood resides in the recessed cavity for a short period of time, sufficient to wash and cool the surfaces of the bearing, but does not reside in the cavity long enough to induce blood damage.
  • the invention consists of at least four synergistically interacting geometric features (to be described in detail below).
  • the invention can be applied to fluid and/or blood pumps of arbitrary configuration, whether centrifugal, axial, and/or mixed flow in nature, i.e., or a combination thereof.
  • the present invention involves the mitigation of blood clotting (i.e., thrombus formation) in blood transporting turbomachines that have rotating components supported by simple bearings.
  • simple bearings include, for example, pivot bearings, ball- and-cup bearings, pin bearings, journal bearings, and other similar bearings composed of one rotating surface adjacent to one stationary surface that are mated by conformal geometric shapes within and differing only by small dimensional tolerances.
  • these types of simple bearings tend to generate heat via viscous dissipation and are often situated within blood flow streams that are relatively stagnant compared to other blood flow regions of the device.
  • the invention discloses at least four novel key shape features in the region of simple bearings that passively flush blood, or other types of fluids for other possible applications, away from the bearing(s) and thereby enhance convective flow immediately adjacent to the bearings, decrease thermal heating of the bearings, and ultimately mitigate thrombus formations and their complications in the region of the simple bearings.
  • FIG. 1 shows the notional centrifugal flow turbomachine of the invention supported by a
  • FIG. 2 shows the notional axial flow turbomachine of the invention with its central rotor supported by two simple journal bearings. Stagnant blood flow often persists adjacent to both the fore and aft simple bearings and often leads to thrombus formations at either or both locations.
  • the present invention addresses and resolves this problem.
  • FIG. 3 shows the notional centrifugal flow turbomachine of the invention that has the at least four key shape features to enhance the washing of the simple bearing and the passive flushing of blood from the cavity surrounding the bearing.
  • the first feature is a bearing cavity or void defined by the second feature, namely, a discontinuous change in the blood flow cross- sectional area in the lower gap that results in a discontinuous expansion in the blood flow volume in the lower gap.
  • the third feature is the inclined conduits through the rotor body that represent a plurality of secondary flow ports that centrifugally pump blood out of the bearing cavity.
  • the fourth and optional feature of the invention is a lower gap that is tapered to accelerate flow as fluid or blood enters the bearing cavity and thereby more forceftilly washes the lower portion of the simple bearing.
  • FIG. 4 shows the notional axial flow turbomachine of the invention that has the at least four key shape features to enhance the washing of both of the simple journal bearings and the passive flushing of blood from the cavity surrounding each bearing.
  • the first feature is the bearing cavities or voids (both fore and aft) defined by the second feature, namely, a
  • the third feature is the inclined conduits (both fore and aft) that represent a plurality of secondary flow ports that centrifugally pump blood out of each bearing cavity.
  • the fourth and optional feature of the invention are gaps leading to the bearings (both fore and aft) that are tapered to accelerate flow as fluid or blood enters each cavity and thereby more forcefully washes the lower portion of each simple bearing.
  • FIG. 5 shows the notional centrifugal flow turbomachine of the invention having one of many alternative embodiments of the key shape features to enhance the w ashing of the simple bearing and the passive flushing of blood from the cavity surrounding the bearing.
  • This figure shows one particular embodiment that modifies the first feature, namely, the cavity and a tapering of the cavity wall shape such that the second feature of a discontinuous change in the blood flow cross-sectional area in the gap that results in a discontinuous expansion in the blood flow volume in the gap leading to the bearings is not lost.
  • the third feature namely, a plurality of secondary flow ports, is shown to intersect the bearing cavity at a different location than the embodiment shown in FIG. 3, and the ports are also shown to have increasing cross- sectional areas along their lengths.
  • FIG. 6 shows the notional centrifugal flow turbomachine of the invention having another of many alternative embodiments of the key shape features needed to enhance the washing of the simple bearing and the passive flushing of blood from the cavity surrounding the bearing.
  • This figure shows one particular embodiment that modifies the fourth optional feature, namely, the tapered lower gap is created by changing the pump shape instead of tapering the rotor body as in FIGS. 3 and 5.
  • the ball-and-cup simple bearing shown is inverted to illustrate that such bearing orientations are compatible with the present invention.
  • the optimal shapes for the bearing cavity, the comer shapes of the discontinuous area and volumetric expansions, the port shapes, and the tapered lower gap shape must be determined via engineering experience and intuition, manual iterative analyses, experimental studies, and/or formal shape design optimization.
  • the embodiments shown in FIGS. 3, 4, 5, and 6 are not to scale and are not intended to represent the possible final optimal shapes.
  • References to blood herein also encompass any biological fluid.
  • a passively flushed bearing blood pump assembly comprising an outer casing 1 and a rotating member 2.
  • a pumping chamber 3 defined by the outer casing 1 and the rotating member 2 is a pumping chamber 3, an inlet 4 for blood, and an outlet 5 for blood.
  • a primary blood flow path is created between the inlet 4 and the outlet 5.
  • the rotating member 2 of a centrifugal flow pump is rotationally suspended relative to the outer casing 1 by at least one simple bearing.
  • the rotating member 2 of the centrifugal pump may be suspended by a simple bearing 6 located beneath the rotating member 2 opposite the inlet 4.
  • the rotating member 2 of the centrifugal pump may be suspended by two simple bearings: for example, one simple bearing 6 located beneath the rotating member 2 opposite the inlet 4, and an opposing second simple bearing located in the inlet 4 (this configuration is not shown ).
  • the simple bearing 6 is composed of a stationary portion 7 that is embedded in the outer casing 1 and a precision mated rotating portion 8 that is embedded in the rotating member 2.
  • a ball-and-cup simple bearing 6 is shown with a stationary portion 7 of the simple bearing 6 taking the form of a cup, and the precision mated rotating portion 8 of the simple bearing 6 taking the form of a ball.
  • the respective ball and cup features of the simple bearing 6 can be inverted or reversed in orientation, i.e., the precision mated rotating portion 8 (ball) could be located in the stationary outer casing 1 and the stationary portion 7 (cup) could be part of the rotating member 2 (e.g., in FIG. 6).
  • the distance from the rotating member 2 of the precision interface between the precision mated rotating portion 8 and the stationary portion 7 of the simple bearing 6 is and can be greater (more) or less (i.e., adjustable), depending on the relative sizes of the rotating portion 8 and the stat iffy portion 7 of the simple bearing 6.
  • the rotating member 2 of an axial flow pump is rotationally suspended relative to the outer casing 1 by two simple bearings: for example, a first journal bearing 9 and a second journal bearing 10.
  • the first journal bearing 9 is located in the rotating member 2 on the inlet 4 side of the pump, and an opposing second journal bearing 10 is located in the outlet 5 side of the pump.
  • the first journal bearing 9 and second journal bearing 10 each are composed of a stationary portion known as a journal holder 11 and a rotating portion known as a journal pin 12.
  • the stationary journal holder 11 is embedded in a flow stator 13 that is attached and fixed to the outer casing 1.
  • the rotating member 2 is supported by two embedded journal pins 12 that are precision mated to the stationary journal holders 11.
  • FIG. 2 (and like parts in FIG.
  • first and second journal bearings 9 and 10 each have a stationary portion and a rotating portion and are each shown with the stationary portion of the first and second journal bearings 9 and 10 talcing the form of a journal holder 11, and the rotating portion of the first and second journal bearings 9 and 10 taking the form of a journal pin 12.
  • the respective journal holder 11 and journal pin 12 features of the first and second journal bearings 9 and 10 are reversible and can be reversed in orientation, i.e., the journal holder 11 can be in the stationary outer casing 1 and the journal pin 12 can be part of the rotating member 2.
  • the journal bearing, holder, and pin references herein are and can be for simple bearings.
  • four features of the invention are as follows: (1) a tapered axisymmetric gap 14 or void with decreasing gap or void width as blood approaches the simple bearing 6, the first journal bearing 9, and the second journal bearing 10; (2) an axisymmetric cavity 15 or void that encompasses one or both portions of the bearings 6, 9, and/or 10; (3) a plurality of first secondary flow ports 16 that centrifugally pump blood out of the axisymmetric cavity 15 and into the (primary) pumping chamber 3; and (4) a non-smooth, effectively discontinuous volumetric expansion 17 (or transition) of the rotating member 2 from the tapered axisymmetric gap 14 into the axisymmetric cavity 15.
  • the tapered axisymmetric gap 14 is designed to accelerate blood flow as it enters the axisymmetric cavity 15 and thereby more forcefully washes both portions of the simple bearing 6, the first journal bearing 9, and the second journal bearing 10.
  • the first secondary flow ports 16 and a plurality of second secondary flow ports 18 may consist of any ordinal number of plurality, and are or may be inclined or declined within the rotating member 2 at optimal angles that maximize centrifugal pumping specific to each particular blood pump configuration.
  • the first secondary flow ports 16 and/or the second secondary flow ports 18 may have constant cross-sectional areas and/or non-constant cross-sectional areas.
  • the axisymmetric cavity 15 will consist of an axisymmetric profile that is a non-smooth, effectively discontinuous volumetric expansion 17 with respect to the adjacent tapered axisymmetric gap 14.
  • the tapered axisymmetric gaps 14 may be formed via a tapering of the rotating member (rotor) 2 with respect to the outer casing (housing) 1 (as shown in FIGS 3, 4, and 5) or, optionally, may be formed via a tapering of the outer casing (housing) 1 with respect to the rotating member (rotor) 2 (as shown in FIG. 6).
  • the simple bearing 6 may be an inverted simple bearing 19, such as a ball-and-cup bearing for example, in any particular pump configuration.
  • the optimal shapes for the axisymmetric cavity 15, the discontinuous volumetric expansion 17, the first secondary flow ports 16, the second secondary flow ports 18, and the tapered axisymmetric gaps 14 may be determined via engineering experience and intuition, manual iterative analyses, experimental studies, and/or formal shape design optimization.
  • the components of the invention may be comprised of metal, plastic, or a combination thereof.

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Mechanical Engineering (AREA)
  • Cardiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Veterinary Medicine (AREA)
  • Hematology (AREA)
  • Anesthesiology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Biomedical Technology (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Engineering & Computer Science (AREA)
  • Vascular Medicine (AREA)
  • External Artificial Organs (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

La présente invention concerne un procédé, un système et un appareil nouveaux comprenant un palier à balayage passif pour une turbomachine cardiovasculaire utilisée pour pomper du sang et d'autres fluides biologiques. Spécifiquement, la présente invention concerne une cavité de palier à balayage passif destinée à supporter une rotation de rotor à long terme et à grande vitesse par l'intermédiaire de l'amélioration du débit sanguin et de fluide au-delà de paliers simples et l'élimination par convection de l'accumulation de chaleur.
PCT/US2020/013216 2019-01-10 2020-01-10 Palier à balayage passif pour turbomachine cardiovasculaire WO2020146821A1 (fr)

Applications Claiming Priority (2)

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US201962790692P 2019-01-10 2019-01-10
US62/790,692 2019-01-10

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040091354A1 (en) * 2002-11-13 2004-05-13 Jms Co., Ltd. Turbo blood pump
WO2012115155A1 (fr) * 2011-02-24 2012-08-30 株式会社ジェイ・エム・エス Pompe sanguine à turbine
US20170122337A1 (en) * 2014-09-19 2017-05-04 Terumo Kabushiki Kaisha Centrifugal Pump
US20180050142A1 (en) * 2015-03-18 2018-02-22 Abiomed Europe Gmbh Blood pump

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040091354A1 (en) * 2002-11-13 2004-05-13 Jms Co., Ltd. Turbo blood pump
WO2012115155A1 (fr) * 2011-02-24 2012-08-30 株式会社ジェイ・エム・エス Pompe sanguine à turbine
US20170122337A1 (en) * 2014-09-19 2017-05-04 Terumo Kabushiki Kaisha Centrifugal Pump
US20180050142A1 (en) * 2015-03-18 2018-02-22 Abiomed Europe Gmbh Blood pump

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