WO2001007787A1 - Continuous flow rotary pump - Google Patents

Continuous flow rotary pump Download PDF

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Publication number
WO2001007787A1
WO2001007787A1 PCT/US1999/016300 US9916300W WO0107787A1 WO 2001007787 A1 WO2001007787 A1 WO 2001007787A1 US 9916300 W US9916300 W US 9916300W WO 0107787 A1 WO0107787 A1 WO 0107787A1
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WO
WIPO (PCT)
Prior art keywords
rotor
pump
rotors
means
outlet
Prior art date
Application number
PCT/US1999/016300
Other languages
French (fr)
Inventor
Lev Kazatchkov
Lucas Varela
Original Assignee
Impsa International Inc.
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 Impsa International Inc. filed Critical Impsa International Inc.
Priority to PCT/US1999/016300 priority Critical patent/WO2001007787A1/en
Priority claimed from PCT/US2000/017324 external-priority patent/WO2001007760A1/en
Publication of WO2001007787A1 publication Critical patent/WO2001007787A1/en

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00Pumping installations or systems
    • F04D13/02Units comprising pumps and their driving means
    • F04D13/06Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0606Canned motor pumps
    • F04D13/064Details of the magnetic circuit
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00Pumping installations or systems
    • F04D13/12Combinations of two or more pumps
    • F04D13/14Combinations of two or more pumps the pumps being all of centrifugal type
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D3/00Axial-flow pumps
    • F04D3/02Axial-flow pumps of screw type
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES 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
    • A61M1/00Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/10Blood pumps; Artificial hearts; Devices for mechanical circulatory assistance, e.g. intra-aortic balloon pumps
    • A61M1/101Non-positive displacement pumps, e.g. impeller, centrifugal, vane pumps
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES 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
    • A61M1/00Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/10Blood pumps; Artificial hearts; Devices for mechanical circulatory assistance, e.g. intra-aortic balloon pumps
    • A61M1/101Non-positive displacement pumps, e.g. impeller, centrifugal, vane pumps
    • A61M1/1012Constructional features thereof
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES 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
    • A61M1/00Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/10Blood pumps; Artificial hearts; Devices for mechanical circulatory assistance, e.g. intra-aortic balloon pumps
    • A61M1/101Non-positive displacement pumps, e.g. impeller, centrifugal, vane pumps
    • A61M1/1012Constructional features thereof
    • A61M1/1013Types of bearings
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES 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
    • A61M1/00Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/10Blood pumps; Artificial hearts; Devices for mechanical circulatory assistance, e.g. intra-aortic balloon pumps
    • A61M1/101Non-positive displacement pumps, e.g. impeller, centrifugal, vane pumps
    • A61M1/1012Constructional features thereof
    • A61M1/1013Types of bearings
    • A61M1/1017Hydrodynamic bearings
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES 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
    • A61M1/00Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/10Blood pumps; Artificial hearts; Devices for mechanical circulatory assistance, e.g. intra-aortic balloon pumps
    • A61M1/101Non-positive displacement pumps, e.g. impeller, centrifugal, vane pumps
    • A61M1/1029Drive systems therefor
    • A61M1/1031Drive systems therefor using a motor with canned rotor, i.e. a motor enclosed within a casing along with the rotor so that the motor bearings are lubricated by the blood that is being pumped
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES 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
    • A61M1/00Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/10Blood pumps; Artificial hearts; Devices for mechanical circulatory assistance, e.g. intra-aortic balloon pumps
    • A61M1/12Blood pumps; Artificial hearts; Devices for mechanical circulatory assistance, e.g. intra-aortic balloon pumps implantable into the body
    • A61M1/122Heart assist devices, i.e. for assisting an ailing heart, using additional pumping means in the blood circuit

Abstract

A continuous flow axial-flow pump (1) for impelling a fluid under a continuous pattern without kinetic side effects to minimize and eliminate damage to fluid, the pump comprising first (2) and second (4) axially adjacent rotors rotating in opposite directions.

Description

CONTINUOUS FLOW ROTARY PUMP

BACKGROUND OF THE INVENTION

1. Field of the Invention.

The present invention relates to a continuous flow rotary pump, preferably a continuos axial flow rotary pump for impelling liquid through at least one stage, by transferring energy from rotating elements of the pump to a continuous fluid stream, and more preferably the invention relates to a continuous axial flow rotary pump for use in blood circulation assistance, either in intravascular or extravascular circuits, with maximized efficiency and with no, or at least extremely minimized, blood damage, blood clotting, as well as minimum pump dimensions.

Although particular reference will be made in the present specification to a blood pump, it should be understood that the present pump is for use in any other field wherein any fluid must be transferred from one place to another one, either in a closed circulation loop or in any open circuit or path. 2. Description of the Prior Art.

It is well known to provide an axial-flow rotary pump comprising a generically cylindrical casing and/or stator with a rotor, or a plurality of rotors mounted inside the stator to drive a fluid through the pump. The driving of the liquid to transfer the same from an inlet of the pump to a pump outlet is based in the provision of energy to the liquid to increase the fluid pressure thereof. This energy, however, provides several undesired side effects. The elimination of these effects without impairing the pumping efficiency of the pump has been the aim of many developments in the field of pumps, particularly when handling of sensitive fluids, such as explosives, blood, etc., is involved.

Contours, sizes, assemblies and relative positions of the different parts, as well as the stationary and movable surfaces of a pump are aspects and parameters that must be defined when designing the pump. The final objective of the design is to get a maximum efficiency of the pump with a minimum or no side effects resulting from the energy transferred to the fluid during the impelling thereof. Particularly in the case of a blood pump design, the aim is to reach to a pump having a maximum efficiency without side effects causing blood damage and/or blood clotting during operation. Another important objective is to have a pump having a minimum size. The side effects resulting from the energy transferred during rotation of the pump comprise the generation of secondary or side flows, vortex, cavitation and separation of the flow from the surfaces of the stationary and movable parts of the pump.

The continuous fluid flow behavior through a rotary pump provided with blades is mathematically defined by the Euler equation. According to Euler, pressure energy imparted by the rotor is proportional to the increment of the tangential component of velocity. Analysis of the Euler equation is made through the so called velocity triangles shown in Figure 1 for a conventional scheme. Vectors represent averaged velocities on a flow surface and the letter references used in Figure 1 are:

ω angular speed

R radius u=ω.R rotation velocity

C absolute velocity

W relative velocity

Cu tangential component of absolute velocity index 1 is used for the pump inlet index 2 is used for the pump outlet The Euler equation applied to a conventional rotary pump is:

g.H

(R.Cu)2 ( .Cu)ι = η.ω

where,

H Head

G Acceleration due to gravity η Efficiency if Cm = 0, we have

g.H

CU2

R2.η .ω

This is the reason why traditional pump designs include stator blades at the pump outlet, thus trying to reduce as much as possible the tangential component of the velocity and transform the kinetic energy into pressure energy.

Although many efforts have been made to eliminate or at least reduce the above mentioned side effects, by reducing or eliminating the above tangential component, for example, no solutions have been found hereinbefore. When a small Reynold's number is involved, that is when one handles small pumps and/or viscous liquids, stator blades at the pump outlet can not effectively reduce the tangential component of the velocity and transform kinetic energy into pressure energy, no matter the shape or number of blades provided. Therefore, flow separation and side flows are formed at the stator blades which cause hemolysis and blood clotting.

There are indeed several patents disclosing pumps with stator blades at the pump outlet with the purpose of eliminating, as much as possible, the tangential component of fluid speed exiting the impelling stage of the pump. U.S. Patent No. 4,846,152, issued to Richard K. Wampler, discloses a miniature intravascular blood-pump formed as a single stage with a rotor and an elongated stator, the rotor having two rows of blades and the stator having a single row of blades, within a tubular housing. The blades of the stator are reversed-twisted and have an unusual length to straightens and slow the blood flow so as to prevent the deposit of blood particles. This stator, however, does not provide for the elimination of any tangential component of the flow speed at the exit of the pump.

U.S. Patent No. 4,908,012 to John C. Moise, discloses an implantable ventricular assistance pump having a tube in which a pump rotor and stator are coaxially contained, and purge fluid is introduced into stator blades of the pump to avoid creation of discontinuities in the blood path wall. The object of this cited patent is to reduce the size of the implant and minimize the risk of infection by reducing vibration, minimizing the percutaneous conduit, and directing most of the heat generated by the pump into the blood. The problem of the flow kinetic energy is not addressed and, in fact, the provision of the bladed stator does not reduce the tangential component of the flow speed.

U.S. Patent No. 5,209,650 to Guy B. Lemieux, discloses a pump integral with an electric motor and impeller assembly that rotates within a stator casing and is supported on hydrostatic radial and thrust bearings so as to avoid having to provide external seals or friction type bearings. Although rotors rotating in opposite directions are provided in this patent, it is clearly disclosed in its specification that the invention addresses the problems that occur with leaking mechanical seals and worn bearings. While Lemieux specifically includes stay vanes pitched to diffuse the liquid from the second stage integral rotor and impeller assembly, the problem of kinetic energy and tangential components of the blood flow is not considered, and it can not be overcome in any way by providing, as disclosed and illustrated in this patent, axial rotors separated by axial stators.

U.S. Patent No. 5,211,546 to Milton S. Issacson discloses an axial flow blood pump including stator blades and rotor, the object of which is to minimize the structure by which the rotor is suspended with respect to the stator to minimize the overall diameter of the motor and pump combination. No considerations are made relating to the tangential components of the blood flow and the side effects resulting thereof.

U.S. Patent No. 5,588,812 to Lynn P. Taylor discloses an implantable electric blood pump having a motor stator and a rotor, the stator including blades for slowing and de-spinning the blood flow.

U.S. Patent No. 5,678,306 to Richard J. Boze an discloses a method for optimizing each of a plurality of blood pump configuration parameters in the known pump components and variations. While Bozeman includes a diffuser with five to eight fixed blades for de- accelerating and redirecting the outflow at blood flow path exit to boost pump performance, the problem of the tangential components of the speed is not solved.

U.S. Patent no. 5,707,218 issued to Timothy R. Maher discloses an axial-flow blood pump having a rotor suspended in ball-and-cup bearings which are blood-cooled but not actively blood-lubricated. While, Maher includes outlet stator blades for slowing and de-spinning the blood flow for discharge into the pump outlet, again, the problem of the tangential components in the blood flow is not addressed. Other rotary pumps are known from U.S. Patents Nos . 4,779,614; 5,040,944; 5,112,292 and 5,692,882 but these documents have not addressed the problem of the tangential component of the flow velocity.

Concluding, the problem of the flow separation and secondary flows have not been addressed and solved by any of the patents mentioned above.

It would be therefore convenient to have a continuous axial-flow pump having a minimum quantity of components and capable of providing a continuous flow without side effects resulting from the kinetic energy of the circulating fluid and affecting the fluid integrity, particularly to avoid the blood damage and blood clotting by eliminating the flow separation and secondary flows.

3. Summary of the Invention.

It is therefore one object of the present invention to provide a continuous axial-flow pump for impelling a fluid under a continuous pattern without side effects to minimize and eliminate damage to fluid, the pump comprising two axial adjacent rotors rotating in opposite directions.

It is still another object of the present invention to provide a continuous axial-flow pump having at least one stage, comprising an outer casing and rotor means mounted in the casing, the rotor means comprising at least two adjacent rotors rotating in opposite directions. It is a further object of the present invention to provide a rotary assembly for providing a continuous axial- flow, comprising at least two adjacent rotors rotating in opposite directions and capable of being mounted in a pump, preferably a blood pump.

According to the invention, it has been found that with the substitution of the stator blades at the pump outlet of a conventional pump by a rotating impeller rotating in a direction opposite to the' one of the conventional rotor, the pump is effective in eliminating the tangential component of the flow velocity and transforming the kinetic energy of the flow into pressure energy.

For defined combinations of speeds and outputs, the flow at the pump outlet is axial without flow separation, and secondary flows disappear.

The above and other objects, features and advantages of this invention will be better understood when taken in connection with the accompanying drawings and description.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention is illustrated by way of example in the following drawings wherein: FIG. 1 shows a diagram of velocity triangles according to the Euler equation for a conventional rotary pump;

FIG. 2 shows an elevation view, partially in section, of a basic construction for a pump in accordance with the invention;

FIG. 3 shows a perspective view of two adjacent impelling rotors according to the invention;

FIG. 4 shows an elevation view, partially in section, of a basic construction for a pump in accordance with another embodiment of the invention;

FIG. 5 shows an elevation view, partially in section, of a basic construction for a pump in accordance with even another embodiment of the invention;

FIG. 6 shows an elevation view, partially in section, of a basic construction for a pump in accordance with a further embodiment of the invention; and

FIG. 7 shows a diagram of velocity triangles according to the Euler equation for a rotary pump according to the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Now referring in detail to the drawings illustrating the pump of the invention it may be seen from FIG. 2 that the inventive rotary pump indicated by general numeral reference 1 is comprised of two adjacent impellers or rotary means, preferably a first rotor 2 having impeller means comprising twisted blades 3, and a second rotor 4 provided with impeller means comprising twisted blades 5. Blades 5 are twisted in opposite or reversed direction relative to blades 3. Rotors 2, 4 rotate, according to the concepts of the invention, in opposite directions, as shown by arrows A, B, around longitudinal axis X of the pump. According to the rotary directions indicated by arrows A, B, the left side of Figure 2 corresponds to inlet 6 of the pump while the right side of the Figure corresponds to outlet 7 of the pump. Preferably, opposite outer ends 8, 9 of rotors 2, 4 are cone-shaped to accommodate the fluid flow. Inner facing ends 10, 11 of rotors 2, 4 are adjacent so that an outlet of rotor 2, when rotor 2 is an inlet rotor, is adjacent to an inlet of rotor 4 when rotor 4 defines an outlet rotor. The "inlet" and "outlet" terms are used to qualify the rotor that is at the inlet side 6 or at the outlet side 7 of the pump. Obviously, the inlet and outlet of the pump will depend on the rotary directions of the rotors. Although the directions are indicated with arrows A, B these directions can be inverted if desired.

Rotors 2, 4 may be conveniently arranged within a casing, preferably a cylindrical, tubular casing and stator motor components 13, 14 may be provided to drive the rotors. First rotor 2 rotates by the driving action of stator motor 13 and transfers energy to the fluid flow, preferably the blood flow, and increases the tangential component of velocity of the flow. Rotor 4 counter rotates under the action of stator motor component 14 and transfers pressure energy to the flow as well as eliminates the above cited tangential component at the outlet side of the pump for given combinations of heads and discharges or outputs.

Fig. 3 shows rotors 2, 4 in a perspective view wherein blades 3, 4 are clearly depicted to see the location and development thereof around the corresponding rotor. Blades 3, 4 are twisted around the rotors, more precisely, the blades extend hellicaly over the rotors with blades 3 defining a first-direction helix and blades 4 defining a second-direction helix opposite to the first- direction.

Fig. 4 shows another embodiment of the invention wherein each rotor has an entire cone-shape and both rotors are faced and adjacent by their cone-bases. The numeral references used for identifying the equivalent components of the several embodiments comprise the same numeral reference used in Figures 2, 3 plus a dot (.) and the number of the corresponding Figure. Thus, the rotors in Fig. 4 are indicated with 2.4, 4.4. Casing 12.4 has a profile to accommodate rotors 2.4, 4.4 inside and motor components 13.4, 14.4 will be arranged correspondingly around casing 12.4, as it clearly shown. Fig. 5 shows another embodiment of the invention wherein each stator motor component 13.5, 14.5 is combined with a band 15, 16 for hydrodynamic suspension of the components .

Finally, Fig. 6 shows another embodiment of the invention wherein each outer end of the rotors comprises a ball-socket bearing 17, 18 that is mounted on a corresponding support 19, 20 which in turn is fixed to casing 12.6.

It is to be noted that although motor components 13, 14 have been illustrated the rotors may be actuated through other means such as one or more rotary wires connected to the rotors .

Referring to Fig. 7 the average velocity triangles of Euler equation for the present invention may be seen, where :

α>ι, τ|ι, Hi are angular speed, efficiency and head of the 1st impeller, namely the first rotor; α>2, \ι, H2 are angular speed, efficiency and head of the 2nd impeller, namely the second rotor;

in double index the first one is the number of the impeller and the second means: 1-inlet of impeller

2-outlet of impeller. The Euler equation for the first impeller is

Figure imgf000015_0001

Figure imgf000015_0002

g.Hα

(R.Cu)ι∑ and

Figure imgf000015_0003

g.Hα

CU12 -

Figure imgf000015_0004

For the second impeller is

g.H2

(R.CU)22 - (R.Cu)21 = η22

since (R.C 21 = (R.C 12

Then

Figure imgf000015_0005

The total head is

Figure imgf000015_0006
Finally,

Figure imgf000016_0001
η2 . ω2 - fflι

then,

(R . C 22 = 0 and CU22 = 0

Therefore , the flow at the pump outlet is totally axial ,

With (Hi and H2) and (t|i and η2) having the same sign, note that the equation

Figure imgf000016_0002

is feasible only if a and ω2 have opposite signs. This is the reason why our proposed scheme includes two impellers rotating in opposite directions.

Stator blades at the pump outlet are not necessary any more. There is an increase of hydraulic efficiency and there is a dramatic reduction of blood damage and blood clotting.

The present invention provides a continuous flow rotary pump housing defining a blood flow path therethrough, and two impellers (rotors) with blades mounted within the pump housing. Rotors are adjacent and counter rotate to each other.

While preferred embodiments of the present invention have been illustrated and described, it will be obvious to those skilled in the art that various changes and modifications may be made therein without departing from the scope of the invention as defined in the appended claims.

Claims

WE CLAIM :
1. A continuous axial-flow pump having at least one stage, comprising an outer casing and rotor means mounted in the casing, the rotor means comprising: at least two adjacent rotors rotating in opposite directions.
2. The pump of claim 1, wherein the rotors are independent from each other.
3. The pump of claim 1, wherein the rotors are independently driven.
4. The pump of claim 1, wherein each rotor includes impeller means.
5. The pump of claim 4, wherein the impeller means of each rotor comprise twisted blades.
6. The pump of claim 5, wherein the twisted blades of one rotor are angularly reversed relative to the twisted blades of the adjacent rotor.
7. The pump of claim 1, wherein the rotors comprise an inlet rotor and an outlet rotor, the inlet rotor having an inlet end and an outlet end, the outlet rotor having an inlet end and an outlet end, the outlet end of the inlet rotor facing the inlet end of the adjacent outlet rotor.
8. Rotary means for providing a continuous axial- flow, comprising: at least two adjacent rotors rotating in opposite directions .
9. The means of claim 8, wherein the rotors are independent from each other.
10. The means of claim 8, wherein the rotors are independently driven.
11. The means of claim 8, wherein each rotor includes impeller means.
12. The means of claim 11, wherein the impeller means of each rotor comprise twisted blades.
13. The means of claim 12, wherein the twisted blades of one rotor are angularly reversed relative to the twisted blades of the adjacent rotor.
14. The means of claim 8, wherein the rotors comprise an inlet rotor and an outlet rotor, the inlet rotor having an inlet end and an outlet end, the outlet rotor having an inlet end and an outlet end, the outlet end of the inlet rotor facing the inlet end of the adjacent outlet rotor.
15. The means of claim 8, wherein the rotors are rotatably mounted within a casing.
16. The means of claim 8, wherein the rotors define an axial fluid flow.
17. The means of claim 8, wherein the rotors define a semi-axial fluid flow.
18. The means of claim 8, wherein one of the rotors defines an axial fluid flow and the other rotor defines a semi-axial fluid flow.
19. The means of claim 8, wherein the rotors are mounted in a blood pump.
20. The pump of claim 1, wherein the rotors define an axial fluid flow.
21. The pump of claim 1, wherein the rotors define a semi-axial fluid flow.
22. The pump of claim 1, wherein one of the rotors defines an axial fluid flow and the other rotor defines a semi-axial fluid flow.
23. The pump of claim 1, wherein the pump is a blood pump.
AMENDED CLAIMS
[received by the International Bureau on 11 August 2000 (11.08.00); original claims 1-23 replaced by new claims 1-8 (2 pages)]
What is claimed is:
1. A continuous axial flow blood pump having at least one stage, comprising an outer casing and rotors mounted in the case, the rotors having respective ends engaged to each other at a central portion of the pump, the rotors including blades and the cone shaped ends extending axially beyond the blades, and the rotors rotating in opposite directions.
2. A continuous axial flow blood pump having at least one stage, comprising an outer casing and rotor assembly mounted in the casing, the rotor assembly comprising: at least two adjacent rotors rotating in opposite directions with angular speeds col and co2 complying with the formula:
η22 η, .ω,
3. A method of pumping blood comprising the steps of:
providing intake and exhaust conduits;
provided blood; and
pumping the blood between the intake and exhaust conduits using a
continuous axial-flow pump having at least one stage comprising an outer
casing and rotor assembly mounted in the casing, the rotor assembly
comprising at least two rotors rotating in opposite directions. 18
4. The method of claim 3 in which the rotors are independently driven.
5. The method of claim 3 in which the pumping is intravenous.
6. The method of claim 3 in which the rotors rotate in compliance with
the following formula:
Figure imgf000023_0001
7. The method of claim 3 in which the rotors have respective ends
engaged to each other at a central portion of the pump and opposite cone-shaped
ends.
8. The method of claim 3 in which a rotor has blades that are twisted
angularly opposite the blades of another rotor.
PCT/US1999/016300 1999-07-26 1999-07-26 Continuous flow rotary pump WO2001007787A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/US1999/016300 WO2001007787A1 (en) 1999-07-26 1999-07-26 Continuous flow rotary pump

Applications Claiming Priority (9)

Application Number Priority Date Filing Date Title
PCT/US1999/016300 WO2001007787A1 (en) 1999-07-26 1999-07-26 Continuous flow rotary pump
AU53177/99A AU5317799A (en) 1999-07-26 1999-07-26 Continuous flow rotary pump
PCT/US2000/017324 WO2001007760A1 (en) 1999-07-26 2000-06-23 Hydraulic seal for rotary pumps
CNB008108498A CN1196866C (en) 1999-07-26 2000-06-23 Hydraulic seal for rotary pumps
AT00941672T AT307964T (en) 1999-07-26 2000-06-23 Hydraulic seal for rotary pumps
EP00941672A EP1212516B1 (en) 1999-07-26 2000-06-23 Hydraulic seal for rotary pumps
DE60023523T DE60023523T2 (en) 1999-07-26 2000-06-23 Hydraulic seal for rotary pumps
ES00941672T ES2252018T3 (en) 1999-07-26 2000-06-23 hydraulic seal for rotary pumps.
AU56346/00A AU5634600A (en) 1999-07-26 2000-06-23 Hydraulic seal for rotary pumps

Publications (1)

Publication Number Publication Date
WO2001007787A1 true WO2001007787A1 (en) 2001-02-01

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WO2013110140A1 (en) * 2012-01-24 2013-08-01 Aquaglobe Pty Ltd A variable output generator and water turbine
WO2013171053A1 (en) * 2012-05-18 2013-11-21 Xylem Ip Holdings Llc Pump device
US8900060B2 (en) 2009-04-29 2014-12-02 Ecp Entwicklungsgesellschaft Mbh Shaft arrangement having a shaft which extends within a fluid-filled casing
US8926492B2 (en) 2011-10-11 2015-01-06 Ecp Entwicklungsgesellschaft Mbh Housing for a functional element
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US8944748B2 (en) 2009-05-05 2015-02-03 Ecp Entwicklungsgesellschaft Mbh Fluid pump changeable in diameter, in particular for medical application
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US8998792B2 (en) 2008-12-05 2015-04-07 Ecp Entwicklungsgesellschaft Mbh Fluid pump with a rotor
US9028216B2 (en) 2009-09-22 2015-05-12 Ecp Entwicklungsgesellschaft Mbh Rotor for an axial flow pump for conveying a fluid
US9067006B2 (en) 2009-06-25 2015-06-30 Ecp Entwicklungsgesellschaft Mbh Compressible and expandable blade for a fluid pump
US9089670B2 (en) 2009-02-04 2015-07-28 Ecp Entwicklungsgesellschaft Mbh Catheter device having a catheter and an actuation device
US9217442B2 (en) 2010-03-05 2015-12-22 Ecp Entwicklungsgesellschaft Mbh Pump or rotary cutter for operation in a fluid
US9314558B2 (en) 2009-12-23 2016-04-19 Ecp Entwicklungsgesellschaft Mbh Conveying blades for a compressible rotor
US9328741B2 (en) 2010-05-17 2016-05-03 Ecp Entwicklungsgesellschaft Mbh Pump arrangement
US9339596B2 (en) 2009-12-23 2016-05-17 Ecp Entwicklungsgesellschaft Mbh Radially compressible and expandable rotor for a fluid pump
US9358330B2 (en) 2009-12-23 2016-06-07 Ecp Entwicklungsgesellschaft Mbh Pump device having a detection device
US9416783B2 (en) 2009-09-22 2016-08-16 Ecp Entwicklungsgellschaft Mbh Compressible rotor for a fluid pump
US9416791B2 (en) 2010-01-25 2016-08-16 Ecp Entwicklungsgesellschaft Mbh Fluid pump having a radially compressible rotor
US9603983B2 (en) 2009-10-23 2017-03-28 Ecp Entwicklungsgesellschaft Mbh Catheter pump arrangement and flexible shaft arrangement having a core
US9611743B2 (en) 2010-07-15 2017-04-04 Ecp Entwicklungsgesellschaft Mbh Radially compressible and expandable rotor for a pump having an impeller blade
US9771801B2 (en) 2010-07-15 2017-09-26 Ecp Entwicklungsgesellschaft Mbh Rotor for a pump, produced with a first elastic material
US9867916B2 (en) 2010-08-27 2018-01-16 Berlin Heart Gmbh Implantable blood conveying device, manipulating device and coupling device
US9895475B2 (en) 2010-07-15 2018-02-20 Ecp Entwicklungsgesellschaft Mbh Blood pump for the invasive application within a body of a patient
US9974893B2 (en) 2010-06-25 2018-05-22 Ecp Entwicklungsgesellschaft Mbh System for introducing a pump
US10107299B2 (en) 2009-09-22 2018-10-23 Ecp Entwicklungsgesellschaft Mbh Functional element, in particular fluid pump, having a housing and a conveying element
US10172985B2 (en) 2009-08-06 2019-01-08 Ecp Entwicklungsgesellschaft Mbh Catheter device having a coupling device for a drive device
US10265448B2 (en) 2009-05-05 2019-04-23 Ecp Entwicklungsgesellschaft Mbh Fluid pump changeable in diameter, in particular for medical application

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US1071042A (en) * 1911-05-31 1913-08-26 Percy W Fuller Multistage parallel-flow pump.
US2470794A (en) * 1943-12-20 1949-05-24 Robert E Snyder In-line fluid pump
US3083893A (en) * 1960-06-02 1963-04-02 Benson Mfg Co Contra-rotating blower
US3276382A (en) * 1964-03-05 1966-10-04 Harvey E Richter Fluid flow device

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Publication number Priority date Publication date Assignee Title
US1071042A (en) * 1911-05-31 1913-08-26 Percy W Fuller Multistage parallel-flow pump.
US2470794A (en) * 1943-12-20 1949-05-24 Robert E Snyder In-line fluid pump
US3083893A (en) * 1960-06-02 1963-04-02 Benson Mfg Co Contra-rotating blower
US3276382A (en) * 1964-03-05 1966-10-04 Harvey E Richter Fluid flow device

Cited By (40)

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US9404505B2 (en) 2008-12-05 2016-08-02 Ecp Entwicklungsgesellschaft Mbh Fluid pump with a rotor
US8998792B2 (en) 2008-12-05 2015-04-07 Ecp Entwicklungsgesellschaft Mbh Fluid pump with a rotor
US9964115B2 (en) 2008-12-05 2018-05-08 Ecp Entwicklungsgesellschaft Mbh Fluid pump with a rotor
US9089670B2 (en) 2009-02-04 2015-07-28 Ecp Entwicklungsgesellschaft Mbh Catheter device having a catheter and an actuation device
US9649475B2 (en) 2009-02-04 2017-05-16 Ecp Entwicklungsgesellschaft Mbh Catheter device having a catheter and an actuation device
US9981110B2 (en) 2009-02-04 2018-05-29 Ecp Entwicklungsgesellschaft Mbh Catheter device having a catheter and an actuation device
US8979493B2 (en) 2009-03-18 2015-03-17 ECP Entwicklungsgesellscaft mbH Fluid pump
US8900060B2 (en) 2009-04-29 2014-12-02 Ecp Entwicklungsgesellschaft Mbh Shaft arrangement having a shaft which extends within a fluid-filled casing
US9512839B2 (en) 2009-05-05 2016-12-06 Ecp Entwicklungsgesellschaft Mbh Fluid pump changeable in diameter, in particular for medical application
US8944748B2 (en) 2009-05-05 2015-02-03 Ecp Entwicklungsgesellschaft Mbh Fluid pump changeable in diameter, in particular for medical application
US10265448B2 (en) 2009-05-05 2019-04-23 Ecp Entwicklungsgesellschaft Mbh Fluid pump changeable in diameter, in particular for medical application
US9067006B2 (en) 2009-06-25 2015-06-30 Ecp Entwicklungsgesellschaft Mbh Compressible and expandable blade for a fluid pump
US10172985B2 (en) 2009-08-06 2019-01-08 Ecp Entwicklungsgesellschaft Mbh Catheter device having a coupling device for a drive device
US9028216B2 (en) 2009-09-22 2015-05-12 Ecp Entwicklungsgesellschaft Mbh Rotor for an axial flow pump for conveying a fluid
US9416783B2 (en) 2009-09-22 2016-08-16 Ecp Entwicklungsgellschaft Mbh Compressible rotor for a fluid pump
US10107299B2 (en) 2009-09-22 2018-10-23 Ecp Entwicklungsgesellschaft Mbh Functional element, in particular fluid pump, having a housing and a conveying element
US9603983B2 (en) 2009-10-23 2017-03-28 Ecp Entwicklungsgesellschaft Mbh Catheter pump arrangement and flexible shaft arrangement having a core
US8932141B2 (en) 2009-10-23 2015-01-13 Ecp Entwicklungsgesellschaft Mbh Flexible shaft arrangement
US9358330B2 (en) 2009-12-23 2016-06-07 Ecp Entwicklungsgesellschaft Mbh Pump device having a detection device
US9903384B2 (en) 2009-12-23 2018-02-27 Ecp Entwicklungsgesellschaft Mbh Radially compressible and expandable rotor for a fluid pump
US9314558B2 (en) 2009-12-23 2016-04-19 Ecp Entwicklungsgesellschaft Mbh Conveying blades for a compressible rotor
US9795727B2 (en) 2009-12-23 2017-10-24 Ecp Entwicklungsgesellschaft Mbh Pump device having a detection device
US9339596B2 (en) 2009-12-23 2016-05-17 Ecp Entwicklungsgesellschaft Mbh Radially compressible and expandable rotor for a fluid pump
US9416791B2 (en) 2010-01-25 2016-08-16 Ecp Entwicklungsgesellschaft Mbh Fluid pump having a radially compressible rotor
US9907891B2 (en) 2010-03-05 2018-03-06 Ecp Entwicklungsgesellschaft Mbh Pump or rotary cutter for operation in a fluid
US9217442B2 (en) 2010-03-05 2015-12-22 Ecp Entwicklungsgesellschaft Mbh Pump or rotary cutter for operation in a fluid
US9759237B2 (en) 2010-05-17 2017-09-12 Ecp Entwicklungsgesellschaft Mbh Pump arrangement
US9328741B2 (en) 2010-05-17 2016-05-03 Ecp Entwicklungsgesellschaft Mbh Pump arrangement
US10221866B2 (en) 2010-05-17 2019-03-05 Ecp Entwicklungsgesellschaft Mbh Pump arrangement
US9974893B2 (en) 2010-06-25 2018-05-22 Ecp Entwicklungsgesellschaft Mbh System for introducing a pump
US9771801B2 (en) 2010-07-15 2017-09-26 Ecp Entwicklungsgesellschaft Mbh Rotor for a pump, produced with a first elastic material
US9895475B2 (en) 2010-07-15 2018-02-20 Ecp Entwicklungsgesellschaft Mbh Blood pump for the invasive application within a body of a patient
US9611743B2 (en) 2010-07-15 2017-04-04 Ecp Entwicklungsgesellschaft Mbh Radially compressible and expandable rotor for a pump having an impeller blade
US9867916B2 (en) 2010-08-27 2018-01-16 Berlin Heart Gmbh Implantable blood conveying device, manipulating device and coupling device
GB2487404A (en) * 2011-01-20 2012-07-25 Sea Lix As Rotor for extracting energy from bidirectional fluid flows
GB2487403A (en) * 2011-01-20 2012-07-25 Sea Lix As Conical helical rotor
US8926492B2 (en) 2011-10-11 2015-01-06 Ecp Entwicklungsgesellschaft Mbh Housing for a functional element
WO2013110140A1 (en) * 2012-01-24 2013-08-01 Aquaglobe Pty Ltd A variable output generator and water turbine
AU2013212537B2 (en) * 2012-01-24 2017-06-01 Aquaglobe Pty Ltd A variable output generator and water turbine
WO2013171053A1 (en) * 2012-05-18 2013-11-21 Xylem Ip Holdings Llc Pump device

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