CN116899098A

CN116899098A - Magnetic suspension artificial heart pump

Info

Publication number: CN116899098A
Application number: CN202310854555.1A
Authority: CN
Inventors: 王义文; 金明迪; 杨雅钧
Original assignee: Harbin University of Science and Technology
Current assignee: Harbin University of Science and Technology
Priority date: 2023-07-13
Filing date: 2023-07-13
Publication date: 2023-10-20

Abstract

The invention discloses a magnetic suspension artificial heart pump, which relates to the technical field of artificial heart pumps and comprises a pump shell, wherein a central rotor is arranged in the pump shell in a suspending way, a torque rotor, an axial flow impeller and a suspension rotor are sequentially arranged on the central rotor, a centrifugal impeller is fixedly connected to the outer side of the suspension rotor, one end of the pump shell is gradually narrowed to the other end, and a centrifugal cavity, a gradual change cavity and a rotor cavity are sequentially formed in the pump shell.

Description

Magnetic suspension artificial heart pump

Technical Field

The invention relates to the technical field of artificial heart pumps, in particular to a magnetic suspension artificial heart pump.

Background

The heart pumping process is also a blood circulation process, blood is pumped into an ascending aorta after the left ventricle contracts, the blood flows into big arteries around the whole body through ascending aorta, enters small arteries in tissue organs, arterial venous networks exist in the tissue organs, the arterial venous blood exchanges at the moment, then flows back through veins, veins of organs such as pelvic cavities, abdominal cavities, lower limbs and the like finally flow into lower vena cava, venous blood of head faces, chest and upper limbs flows into an upper vena cava, both the upper vena cava and the lower vena can finally flow back into a right atrium, the blood of the right atrium enters a right ventricle through tricuspid valve, the blood is pumped into pulmonary artery after the right ventricle contracts, the blood in the pulmonary artery is actually venous blood, oxygen and carbon dioxide exchange is performed after the right ventricle breathes in oxygen, the venous blood becomes arterial blood, the arterial blood flows into the left atrium through the pulmonary veins, and the left atrium enters the left ventricle through mitral valve, so that a heart pumping process is formed, namely a blood circulation process is realized;

however, mechanical friction is generated in the operation process of the traditional heart pump, so that the temperature of blood can be abnormally increased, diseases such as hemolysis, thrombus and the like can be caused along, in addition, the design of the heart pump is small, the impeller of the heart pump needs to keep a high rotating speed to effectively pump blood, the unstable structure of the heart pump is easily caused by the excessively high rotating speed, and the operation is stable low.

Disclosure of Invention

The invention provides a magnetic suspension artificial heart pump, which solves the technical problems that the mechanical friction is generated in the operation process of the traditional heart pump, the temperature of blood can be abnormally increased, diseases such as hemolysis and thrombus can be caused along the blood, in addition, the design of the heart pump is small, the impeller of the heart pump can effectively pump blood only by keeping a high rotating speed, and the unstable structure and the low operation stability of the heart pump are easily caused by the excessively high rotating speed.

In order to solve the technical problems, the magnetic suspension artificial heart pump provided by the invention comprises a pump shell, wherein a central rotor is arranged in the pump shell in a suspending way, a torque rotor, an axial flow impeller and a suspension rotor are sequentially arranged on the central rotor, a centrifugal impeller is fixedly connected to the outer side of the suspension rotor, one end of the pump shell is gradually narrowed to the other end, a centrifugal cavity, a gradual change cavity and a rotor cavity are sequentially formed in the pump shell, and the suspension rotor, the axial flow impeller and the torque rotor are respectively arranged in the centrifugal cavity, the gradual change cavity and the rotor cavity.

Preferably, the centrifugal cavity is of a flat cylindrical structural design, two groups of outer permanent magnets are fixedly embedded in the inner wall of the centrifugal cavity, the two groups of outer permanent magnets are symmetrically arranged, and two groups of inner permanent magnets are fixedly connected with the corresponding two groups of outer permanent magnets in the suspension rotor.

Preferably, the outer permanent magnet and the inner permanent magnet are all obliquely arranged around the axis of the centrifugal cavity at equal intervals, and the same-name magnetic poles of the outer permanent magnet and the inner permanent magnet are oppositely arranged.

Preferably, a plurality of axial flow impellers are fixedly sleeved on the outer side of the central rotor in the gradual change cavity, and the sizes of the axial flow impellers are gradually changed.

Preferably, the inner wall of the rotor cavity is fixedly connected with a plurality of torque windings, the torque rotor is fixedly connected with a torque iron core corresponding to the torque windings, and annular gaps are formed between the torque windings and the torque rotor.

Preferably, the outer wall of one side of the centrifugal cavity is fixedly connected with a blood output tube, and the input port of the blood output tube is tangential to the inner wall of the centrifugal cavity.

Preferably, a blood input tube is fixedly connected to the middle part of one side of the rotor cavity, and the blood input tube and the central rotor are positioned on the same straight line.

Compared with the related art, the magnetic suspension artificial heart pump provided by the invention has the following beneficial effects: according to the magnetic suspension artificial heart pump, through the arrangement of the outer permanent magnet, the inner permanent magnet, the torque winding and the torque iron core, the central rotor can be kept in a suspension state, the problems of temperature rise, hemolysis, thrombus and the like caused by mechanical friction can be avoided, the torque winding is not influenced to drive the central rotor to operate through electrifying, and through the arrangement of the pump shell, the axial flow impeller and the centrifugal impeller, blood is sprayed out from the blood output tube after being pressurized twice, pumping pressure can still be guaranteed under the condition of keeping low rotating speed, and the stability of the magnetic suspension artificial heart pump is improved.

Drawings

FIG. 1 is a perspective view of a magnetic levitation artificial heart pump of the present invention;

FIG. 2 is a side cross-sectional view of a magnetic levitation artificial heart pump of the present invention;

FIG. 3 is a cross-sectional view of the magnetic levitation artificial heart pump of FIG. 2 taken along the direction A-A according to the present invention;

fig. 4 is a cross-sectional view of a magnetic levitation artificial heart pump of fig. 2 along the direction B-B according to the present invention.

Reference numerals in the drawings: 1. a pump housing; 101. a centrifugal cavity; 102. a gradual change cavity; 103. a rotor cavity; 2. a central rotor; 3. a torque rotor; 301. a torque winding; 302. a torque iron core; 4. an axial flow impeller; 5. a suspension rotor; 501. an outer permanent magnet; 502. an inner permanent magnet; 6. a centrifugal impeller; 7. a blood output tube; 8. a blood inlet tube.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention; all other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

The embodiment is given by fig. 1-4, the magnetic suspension artificial heart pump comprises a pump shell 1, a central rotor 2 is arranged in the pump shell 1 in a suspending way, a torque rotor 3, an axial flow impeller 4 and a suspension rotor 5 are sequentially arranged on the central rotor 2, a centrifugal impeller 6 is fixedly connected to the outer side of the suspension rotor 5, one end of the pump shell 1 is gradually narrowed to the other end, a centrifugal cavity 101, a gradual change cavity 102 and a rotor cavity 103 are sequentially formed in the pump shell 1, the suspension rotor 5, the axial flow impeller 4 and the torque rotor 3 are respectively arranged in the centrifugal cavity 101, the gradual change cavity 102 and the rotor cavity 103, blood is sprayed out from a blood output tube 7 after being pressurized for two times, pumping pressure can still be ensured under the condition of keeping a low rotation speed, and the stability of the magnetic suspension artificial heart pump is improved.

The centrifugal cavity 101 is of a flat cylindrical structural design, two groups of outer permanent magnets 501 are fixedly embedded in the inner wall of the centrifugal cavity 101, the two groups of outer permanent magnets 501 are symmetrically arranged, two groups of inner permanent magnets 502 are fixedly connected with the corresponding two groups of outer permanent magnets 501 in the suspension rotor 5, the center rotor 2 is kept in a suspension state, the torque rotor 3, the axial flow impeller 4 and the suspension rotor 5 are all in non-contact with the pump shell 1, and the problems of temperature rise, hemolysis, thrombus and the like caused by mechanical friction can be avoided.

Wherein, the outer permanent magnet 501 and the inner permanent magnet 502 are all inclined around the axis of the centrifugal cavity 101 at equal intervals, and the same-name magnetic poles of the inner permanent magnet 502 and the outer permanent magnet 501 are opposite, and the adjacent outer permanent magnets 501 form a splayed structure, so that the inner permanent magnet 502 can be automatically centered under the action of magnetic field repulsive force, and magnetic suspension is realized.

The axial flow impellers 4 are fixedly sleeved on the outer side of the central rotor 2 in the gradual change cavity 102, the sizes of the axial flow impellers 4 are gradually changed, and the axial flow impellers 4 can synchronously boost blood, so that the blood pressure is quickly increased, and the pumping power is improved.

The inner wall of the rotor cavity 103 is fixedly connected with a plurality of torque windings 301, a torque iron core 302 is fixedly connected with the corresponding torque winding 301 in the torque rotor 3, an annular gap is formed between the torque windings 301 and the torque rotor 3, the torque windings 301 are intermittently electrified, the torque iron core 302 rotates under the action of magnetic force, the center rotor 2 can be driven to rotate, and electric drive control can be realized.

Wherein, the outer wall fixedly connected with blood output tube 7 of one side of centrifugal cavity 101, just the input port of blood output tube 7 tangentially sets up with centrifugal cavity 101 inner wall, and blood will be thrown out by the pressurization under the effect of centrifugal force, and the blood output tube 7 of forward setting has reduced output resistance.

Wherein, a middle part fixedly connected with blood input tube 8 in one side of rotor cavity 103, blood input tube 8 is located same straight line with central rotor 2 for blood can circulate along the clearance between central rotor 2 and the rotor cavity 103 inner wall, and central rotor 2 and rotor cavity 103 do not have the friction, can prevent blood intensification.

Working principle: when the centrifugal pump is used, in an initial state, the interior of the pump shell 1 is vacuumized, after the blood input tube 8 is connected, blood fills the pump shell 1, under the action of the magnetic force of the outer permanent magnet 501 and the inner permanent magnet 502, the central rotor 2 is kept in a suspension state, the torque rotor 3, the axial flow impeller 4 and the suspension rotor 5 are all in no contact with the pump shell 1, the problems of temperature rise, hemolysis, thrombus and the like caused by mechanical friction can be avoided, in operation, the torque winding 301 is electrified intermittently, the torque iron core 302 rotates under the action of the magnetic force, the central rotor 2 can be driven to rotate, the axial flow impeller 4 rotates and extrudes blood at the rear side into the centrifugal cavity 101, so that the blood is pressurized for the first time, the centrifugal impeller 6 rotates, and the blood extruded into the centrifugal cavity 101 is ejected from the blood output tube 7, so that the blood is pressurized again, and the pumping pressure can be ensured under the condition of keeping a low rotation speed.

Claims

1. The utility model provides a magnetic suspension artificial heart pump, includes pump case (1), its characterized in that, the suspension is provided with central rotor (2) in pump case (1), be provided with torque rotor (3), axial impeller (4) and suspension rotor (5) on central rotor (2) in order, the outside fixedly connected with centrifugal impeller (6) of suspension rotor (5), the one end of pump case (1) is to the setting of the gradual change narrow of the other end for centrifugal cavity (101), gradual change cavity (102) and rotor cavity (103) have been formed gradually in pump case (1), just suspension rotor (5), axial impeller (4), torque rotor (3) are set up respectively inside centrifugal cavity (101), gradual change cavity (102) and rotor cavity (103).

2. The magnetic suspension artificial heart pump according to claim 1, wherein the centrifugal cavity (101) is of a flat cylindrical structural design, two groups of outer permanent magnets (501) are fixedly embedded in the inner wall of the centrifugal cavity (101), the two groups of outer permanent magnets (501) are symmetrically arranged, and two groups of inner permanent magnets (502) are fixedly connected in the suspension rotor (5) corresponding to the two groups of outer permanent magnets (501).

3. A magnetic suspension artificial heart pump according to claim 2, wherein the outer permanent magnet (501) and the inner permanent magnet (502) are both arranged in an equidistant and inclined manner around the axis of the centrifugal cavity (101), and the same-name magnetic poles of the inner permanent magnet (502) and the outer permanent magnet (501) are arranged opposite to each other.

4. A magnetic suspension artificial heart pump according to claim 1, characterized in that a plurality of axial flow impellers (4) are fixedly sleeved outside the central rotor (2) in the gradual change cavity (102), and the axial flow impellers (4) are designed in a gradual change size.

5. A magnetic suspension artificial heart pump according to claim 1, wherein the inner wall of the rotor cavity (103) is fixedly connected with a plurality of torque windings (301), a torque iron core (302) is fixedly connected with the corresponding torque windings (301) in the torque rotor (3), and annular gaps are formed between the torque windings (301) and the torque rotor (3).

6. A magnetic suspension artificial heart pump according to claim 1, wherein the outer wall of one side of the centrifugal cavity (101) is fixedly connected with a blood output tube (7), and the input port of the blood output tube (7) is tangential to the inner wall of the centrifugal cavity (101).

7. A magnetic suspension artificial heart pump according to claim 1, characterized in that a blood input tube (8) is fixedly connected to the middle part of one side of the rotor cavity (103), and the blood input tube (8) and the central rotor (2) are positioned on the same straight line.