CN118142074A

CN118142074A - Heart pump

Info

Publication number: CN118142074A
Application number: CN202410406333.8A
Authority: CN
Inventors: 韩利伟; 耿文骥; 郑思远; 闫小珅
Original assignee: Suzhou Xinling Meide Medical Technology Co ltd
Current assignee: Suzhou Xinling Meide Medical Technology Co ltd
Priority date: 2024-04-07
Filing date: 2024-04-07
Publication date: 2024-06-07
Anticipated expiration: 2044-04-07
Also published as: CN118142074B

Abstract

The invention provides a heart pump, which comprises a driving assembly and a driven assembly, wherein the driving assembly comprises a driving shell, a driving shaft, a driving impeller and a driving coupling, the driving shell comprises a driving inner shell and a driving outer shell, an inner cavity is formed in the driving inner shell, and a fluid inlet communicated with the inner cavity is formed in the driving inner shell; one end of the driving shaft is arranged in the inner cavity and connected with the driving coupler, the other end of the driving shaft is connected with the driving impeller, and the driving impeller is suitable for rotating when external fluid flows in along the fluid inlet so as to drive the driving coupler to rotate; the driven assembly comprises a driven shell, a driven shaft, a driven impeller and a driven coupling, and the driven shell is provided with a blood pumping inlet and a blood pumping outlet; the driven shaft is arranged in the driven cavity, one end of the driven shaft is connected with the driven impeller at the other end of the driven shaft, the driven shaft is arranged opposite to the driving shaft, and the driven shaft is suitable for rotating along with the driving shaft. The heart pump provided by the invention can provide stable driving performance and ensure the sealing performance of the driving end.

Description

Heart pump

Technical Field

The invention relates to the field of medical appliances, in particular to a heart pump.

Background

Heart pumps are becoming more and more popular in recent years as key auxiliary devices for heart surgery, and with the improvement of the scientific and technical level of people, heart diseases are also cured with the help of the heart pump auxiliary devices. The heart auxiliary equipment commonly used in the market at present is in an interventional hollow cup motor mode or an in-vitro driven magnetic suspension blood pumping mode; both modes have limitations, the hollow cup motor can be inserted into a human body due to the technical characteristics, but many component materials such as iron cores, coils and the like have no biocompatibility, so that the potential safety hazard is high; the magnetic suspension pump blood driven in vitro has limited pump blood flow due to the long route of pump blood in vitro.

Prior patent CN116943012a discloses a heart pump driving device and a heart pump, the heart pump structure is as shown in fig. 1, a rotor 200 is provided in a housing 100, a plurality of driving vanes 300 are provided on the rotor 200, the plurality of driving vanes 300 divide a driving chamber 210 into a plurality of unit driving chambers along a circumferential direction of the rotor 200; the driving chamber 210 forms a volume expansion part through one part of the unit driving cavities, forms a volume reduction part through the other part of the unit driving cavities, the driving inlet is communicated with the volume expansion part, the driving outlet is communicated with the volume reduction part, and fluid enters the volume expansion part through the driving inlet to do work so as to drive the rotor 200 to rotate in a fixed shaft, and is discharged through the driving outlet at the volume reduction part; the rotor is connected with the impeller 600 and drives the impeller to rotate in the fluid pipeline 400 to pump blood; the rotation of the rotor 200 and the impeller 300 is driven by the flow of the fluid as a power source, and no motor, coil, or the like is required.

However, the solutions of the prior patent have the following problems: the driving vane 300 is abutted against the inner wall of the housing 100, and is rubbed with the housing 100 in the rotation process to cause abrasion, so that the driving performance is affected; the plurality of driving vanes 300 need to divide the driving chamber 210 into a plurality of unit driving chambers 211 with different volumes along the circumferential direction of the rotor 200, the requirement on the setting position of the driving vanes 300 is high, and the design and the installation are time-consuming and labor-consuming; the rotor 200 is connected with the shell 100 without bearings, and the stability of the rotation of the rotor 200 is insufficient; the rotor 200 achieves sealing with the end cap 120 and the fluid line 400 by the first seal 130, and the first seal 130 wears during rotation of the rotor 200 to affect sealing performance.

Accordingly, there is a need to provide a heart pump that uses a fluid-driven drive impeller as power to solve or partially solve the above-described problems.

Disclosure of Invention

The embodiment of the invention provides a heart pump, which optimizes a driving structure to provide stable driving performance and ensure sealing performance of a driving end.

The heart pump comprises a driving assembly and a driven assembly, wherein the driving assembly comprises a driving shell, a driving shaft, a driving impeller and a driving coupling, the driving shell comprises a driving inner shell and a driving outer shell, an inner cavity is formed in the driving inner shell, and a fluid inlet communicated with the inner cavity is formed in the driving inner shell; the driving shaft is arranged in the inner cavity and is in rotary connection with the driving inner shell, the driving coupler is arranged at one end of the driving shaft, which is close to the driven component, the driving impeller is arranged at the other end of the driving shaft, and the driving impeller is suitable for rotating when external fluid flows into the inner cavity along the fluid inlet and drives the driving coupler to rotate;

The driven assembly comprises a driven shell, a driven shaft, a driven impeller and a driven coupling, wherein the driven shell is provided with a driven cavity, and the driven shell is provided with a blood pumping inlet and a blood pumping outlet which are communicated with the driven cavity; the driven shaft is arranged in the driven cavity and is rotationally connected with the driven shell, the driven coupler is arranged at one end of the driven shaft, which is close to the driving assembly, the driven impeller is arranged at the other end of the driven shaft, the driven coupler is arranged opposite to the driving coupler, and the driven coupler is suitable for rotating along with the driving coupler; the driven impeller is suitable for being driven by the driven coupling to rotate so as to pump blood from the blood pumping inlet to the blood pumping outlet.

Optionally, the driving coupling and the driven coupling are magnetic couplings, and the driving coupling at least comprises a pair of magnetic steels with opposite magnetism; the magnetic steel of the driven coupler is identical to the magnetic steel of the driving coupler in logarithm and is in one-to-one correspondence with the magnetic poles of the magnetic steel of the driving coupler, and the driven coupler rotates along with the driving coupler under the action of magnetic force.

Optionally, the magnetic steel of the driving coupling and the magnetic steel of the driven coupling are all disposed on a plane, the driving coupling and the driven coupling are axially oppositely arranged, and the magnetic steels of the driving coupling and the driven coupling with opposite magnetic poles are axially arranged in a one-to-one correspondence manner.

Optionally, the driving coupling and the driven coupling are both in tubular structures, the driving coupling and the driven coupling are arranged radially opposite to each other, and the magnetic steels with opposite magnetic poles of the driving coupling are arranged in radial one-to-one correspondence.

Optionally, the inner driving shell is arranged in the outer driving shell, an outer cavity is formed between the outer wall of the inner driving shell and the inner wall of the outer driving shell, the inner driving shell is provided with a communicating groove for communicating the inner cavity with the outer cavity, and the outer driving shell is provided with a fluid outlet communicated with the outer cavity.

Optionally, the driving housing has a cylindrical structure with a closed end, the driving housing has a closed end and an open end, the fluid inlet and the fluid outlet are both disposed at the open end, and the closed end is connected with the driven housing.

Optionally, the inner driving shell and the outer driving shell are both in cylindrical structures, the inner driving shell and the outer driving shell are in sealing connection at one end to form the closed end, the inner driving shell is opened at the open end to form the fluid inlet, and the outer driving shell is opened at the open end to form the fluid outlet between the inner driving shell and the open end.

Optionally, the driving casing is axially connected with the driven casing, a connection protrusion is arranged at the end part of the closed end, a groove matched with the connection protrusion is arranged at the end part of the driven casing connected with the driving casing, and the connection protrusion is inserted into the groove to realize connection.

Optionally, the drive casing with the follower casing is radial to be connected, the blind end outer wall is provided with the diameter and is less than the linkage segment of drive casing external diameter, the follower casing with the inside diameter of the tip that the drive casing is connected with the diameter of linkage segment matches, the linkage segment inserts the follower casing realizes connecting.

Optionally, the communicating groove is arranged on the driving inner shell and axially corresponds to the space between the bottom of the driving impeller and the head of the driving impeller, and the axial length of the communicating groove is smaller than the length of the driving impeller; the communication grooves are multiple, and the multiple communication grooves are arranged at intervals along the circumferential direction of the driving inner shell.

Optionally, the pump blood inlet is arranged at one end of the driven shell far away from the driven coupling, the pump blood outlet is arranged on the driven shell and axially corresponds to the space between the bottom of the driven impeller and the head of the driven impeller, and the axial length of the pump blood outlet is smaller than the length of the driven impeller; the blood pumping outlets are multiple, and the multiple blood pumping outlets are arranged at intervals along the circumferential direction of the driven shell.

Optionally, a driving bearing is arranged in the driving inner shell, and the driving shaft is arranged in the driving bearing in a penetrating way so as to realize rotational connection with the driving inner shell; the driven shell is internally provided with a driven bearing, and the driven shaft is arranged in the driven bearing in a penetrating manner so as to realize rotary connection with the driven shell.

Compared with the prior art, the technical scheme of the embodiment of the invention has the beneficial effects.

For example, the driving impeller is driven to rotate by pressing fluid from outside, the driving coupler drives the driven coupler to rotate synchronously, so that the driven impeller is driven to rotate, the pumping of blood is realized, the intervention of a motor into the body is avoided, in particular, the introduction of coil copper materials and iron core silicon steel sheet materials in the motor is avoided, materials without biocompatibility are reduced, and potential safety hazards are reduced; by adopting the driving mode of internal intervention, the high-flow blood can be pumped out.

For example, the driving coupling and the driven coupling are magnetic coupling, the driven coupling rotates along with the driving coupling under the action of magnetic force, the driving coupling and the driven coupling do not need to be in direct physical connection, the driving assembly and the driven assembly are connected with the driven housing through the driving housing, the driving inner shell and the driving outer shell of the driving housing are in sealing connection at one end to form a closed end, static sealing between the driving assembly and the driven assembly is realized, sealing performance is guaranteed, and external fluid is prevented from entering blood.

Drawings

FIG. 1 is a schematic diagram of a prior art heart pump;

FIG. 2 is a schematic diagram of a heart pump in accordance with an embodiment of the present invention;

FIG. 3 is a cross-sectional view of a drive assembly for a heart pump in an embodiment of the present invention;

FIG. 4 is a schematic illustration of a drive assembly of a heart pump with a drive housing removed in accordance with an embodiment of the present invention;

FIG. 5 is a cross-sectional view of a driven assembly of a heart pump in an embodiment of the present invention;

FIG. 6 is a schematic illustration of a driven assembly of a heart pump in accordance with an embodiment of the present invention;

FIG. 7 is a schematic illustration of the structure of a heart pump with the drive housing and the driven housing removed in accordance with an embodiment of the present invention;

FIG. 8 is a schematic illustration of an arrangement of a heart pump drive coupling and a driven coupling in an embodiment of the present invention;

FIG. 9 is a schematic diagram of another heart pump in accordance with an embodiment of the present invention;

FIG. 10 is a schematic illustration of another heart pump removal drive housing and driven housing in accordance with an embodiment of the present invention;

fig. 11 is a schematic view of another arrangement of a heart pump drive coupling and a driven coupling in an embodiment of the invention.

Reference numerals illustrate:

10. a drive assembly; 11. driving the impeller; 12. a drive shaft; 13. a drive coupling; 14. a drive bearing; 15. a drive housing;

151. Driving the inner housing; 152. a drive housing; 153. an outer chamber; 154. an inner chamber; 155. a fluid inlet; 156. a fluid outlet; 157. a communicating groove; 158. a closed end; 159. an open end;

20. a driven assembly; 21. a driven impeller; 22. a driven shaft; 23. a driven coupling; 24. a driven bearing; 25. a driven housing;

251. a driven chamber; 252. a pump blood inlet; 253. a pump blood outlet;

100. a housing; 200. a rotor; 300. a drive vane; 400. a fluid line; 500. a transmission shaft; 600. an impeller;

120. An end cap; 130. a first seal;

210. the chamber is driven.

Detailed Description

In order to make the objects, features and advantageous effects of the present invention more comprehensible, embodiments accompanied with figures are described in detail below. It is to be understood that the following detailed description is merely illustrative of the invention, and not restrictive of the invention. Moreover, the use of the same, similar reference numbers in the figures may indicate the same, similar elements in different embodiments, and descriptions of the same, similar elements in different embodiments, as well as descriptions of prior art elements, features, effects, etc. may be omitted. It should be noted that, in the embodiments of the present invention, the axial direction, the radial direction, and the circumferential direction refer to the axial direction, the radial direction, and the circumferential direction of the drive housing, respectively.

Referring to fig. 2-11, an embodiment of the present invention provides a heart pump.

Specifically, comprising a drive assembly 10 and a driven assembly 20, the drive assembly 10 comprises a drive housing 15, a drive shaft 12, a drive impeller 11 and a drive coupling 13, the drive housing 15 comprises a drive inner housing 151 and a drive outer housing 152, the drive inner housing 151 defines an inner chamber 154, the drive inner housing 151 is provided with a fluid inlet 155 communicating with the inner chamber 154; the driving shaft 12 is arranged in the inner chamber 154 and is rotationally connected with the driving inner shell 151, the driving coupler 13 is arranged at one end of the driving shaft 12 close to the driven assembly 20, the driving impeller 11 is arranged at the other end of the driving shaft 12, and the driving impeller 11 is suitable for rotating when external fluid flows into the inner chamber 154 along the fluid inlet 155 and drives the driving coupler 13 to rotate; the external fluid is gas or liquid.

The driven assembly 20 includes a driven housing 25, a driven shaft 22, a driven impeller 21, and a driven coupling 23, the driven housing 25 being provided with a driven chamber 251, the driven housing 25 being provided with a pump blood inlet 252 and a pump blood outlet 253 communicating with the driven chamber 251; the driven shaft 22 is arranged in the driven cavity 251 and is rotationally connected with the driven shell 25, the driven coupler 23 is arranged at one end of the driven shaft 22 close to the driving assembly 10, the driven impeller 21 is arranged at the other end of the driven shaft 22, the driven coupler 23 is arranged opposite to the driving coupler 13, and the driven coupler 23 is suitable for following the driving coupler 13 to rotate; the driven impeller 21 is adapted to rotate by the driven coupling 23 to pump blood from the pump blood inlet 252 to the pump blood outlet 253.

In some embodiments, the driving coupling 13 and the driven coupling 23 are magnetic couplings, and the driving coupling 13 includes at least a pair of magnetic steels with opposite magnetism; the pairs of the magnetic steel of the driven coupler 23 and the magnetic steel of the driving coupler 13 are the same and are arranged in one-to-one correspondence with the magnetic poles of the magnetic steel of the driving coupler 13, and the driven coupler 23 rotates along with the driving coupler 13 under the action of magnetic force.

In some embodiments, the driving inner housing 151 is disposed in the driving outer housing 152, an outer chamber 153 is formed between the outer wall of the driving inner housing 151 and the inner wall of the driving outer housing 152, the driving inner housing 151 is provided with a communication groove 157 communicating the inner chamber 154 with the outer chamber 153, and the driving outer housing 152 is provided with a fluid outlet 156 communicating the outer chamber 153; ambient fluid flows into the inner chamber 154 along the fluid inlet 155, flows into the outer chamber 153 via the communication slot 157, and flows out of the fluid outlet 156, thereby realizing circulation of the ambient fluid.

In some embodiments, the drive housing 15 has a closed-end cylindrical configuration, the drive housing 15 having a closed end 158 and an open end 159, the fluid inlet 155 and the fluid outlet 156 being disposed at the open end 159, the closed end 158 being coupled to the driven housing 25.

In some embodiments, the inner drive housing 151 and the outer drive housing 152 are both cylindrical in configuration, the inner drive housing 151 and the outer drive housing 152 are sealingly connected at one end to form a closed end 158, the inner drive housing 151 is open at an open end 159 to form a fluid inlet 155, and the outer drive housing 152 is open at the open end 159 to form a fluid outlet 156 between the inner drive housing 151 and the inner drive housing 151.

In some embodiments, the inner housing 151 is angled inwardly or curved into an arcuate arrangement proximate the open end 159; the inclined arrangement or the bending into an arc shape is used for adjusting the cross sectional areas of the fluid inlet 155 and the fluid outlet 156, balancing the volume of the channels for inflow and outflow fluid and ensuring that the volume of the inflow and outflow fluid is similar; and the material is bent into an arc shape to form an arc surface, so that the fluid impact resistance is further improved.

In some embodiments, the drive housing 15 is axially coupled to the driven housing 25, the end of the closed end 158 is provided with a coupling protrusion, and the end of the driven housing 25 coupled to the drive housing 15 is provided with a recess matching the coupling protrusion, the coupling protrusion being inserted into the recess to effect the coupling.

In practice, the end of the closed end 158 of the drive housing 15 and the end of the driven housing 25 may be connected by other means, such as threading, welding or bonding, only to ensure that the drive housing 15 and the driven housing 25 remain relatively fixed and that the drive coupling 13 and the driven coupling 23 are disposed correspondingly.

In some embodiments, the communicating groove 157 is disposed on the inner driving housing 151 axially corresponding to between the bottom of the driving impeller 11 and the head of the driving impeller 11, and the axial length of the communicating groove 157 is smaller than the length of the driving impeller 11.

In some embodiments, the communication groove 157 is a plurality of communication grooves 157, and the plurality of communication grooves 157 are disposed at intervals along the circumferential direction of the driving inner case 151.

In some embodiments, the pump inlet 252 is disposed at an end of the driven housing 25 remote from the driven coupling 23, and the pump outlet 253 is disposed on the driven housing 25 axially between a bottom of the driven impeller 21 and a head of the driven impeller 21, and the axial length of the pump outlet 253 is less than the length of the driven impeller 21.

In some embodiments, the number of pump outlets 253 is plural, and the plurality of pump outlets 253 are spaced apart along the circumference of the driven housing 25.

In some embodiments, a drive bearing 14 is disposed in the drive inner housing 151, and the drive shaft 12 is threaded into the drive bearing 14 to effect a rotational connection with the drive inner housing 151.

In some embodiments, a driven bearing 24 is disposed in the driven housing 25, and the driven shaft 22 is threaded into the driven bearing 24 to effect a rotational connection with the driven housing 25.

Referring to fig. 7 and 8, in some embodiments, the magnetic steels of the driving coupling 13 and the magnetic steels of the driven coupling 23 are disposed on a plane, the driving coupling 13 and the driven coupling 23 are axially opposite to each other, and the magnetic steels of the driving coupling 13 and the driven coupling 23 with opposite magnetic poles are axially disposed in a one-to-one correspondence; the outer diameter of the driven coupling 23 is now identical to the outer diameter of the drive coupling 13, so that the driven housing 25 and the drive housing 15 can maintain a consistently smaller outer diameter.

In some embodiments, the outer contours of the driving coupling 13 and the driven coupling 23 are circular, and may be configured into other shapes such as regular polygons, so long as axial magnetization is satisfied, and the magnetic poles are in one-to-one correspondence.

Referring to fig. 9, in some embodiments, the driving housing 15 is radially connected to the driven housing 25, the outer wall of the closed end 158 is provided with a connecting section having a smaller diameter than the outer diameter of the driving housing 15, and the inner diameter of the end of the driven housing 25 connected to the driving housing 15 matches the diameter of the connecting section, and the connecting section is inserted into the driven housing 25 to achieve connection.

In a specific implementation, the driving housing 15 and the driven housing 25 may also be connected by welding, bonding, interference fit, or the like.

Referring to fig. 10 and 11, in some embodiments, the driving coupling 13 and the driven coupling 23 are in cylindrical structures, the driving coupling 13 and the driven coupling 23 are disposed radially opposite to each other, the magnetic steels with opposite magnetic poles of the driving coupling 13 and the driven coupling 23 are disposed radially in one-to-one correspondence, at this time, the outer diameter of the driven coupling 23 is larger than the outer diameter of the driving coupling 13, so that the outer diameter of the driven housing 25 and the outer diameter of the driving housing 15 are increased, and compared with the heart pump with the axial opposite arrangement of the driving coupling 13 and the driven coupling 23, the outer diameter of the heart pump is increased, but the overall axial length of the heart pump is reduced (assuming that the thickness of each piece of the magnetic coupling is 3mm, the axial opposite arrangement of the driving coupling 13 and the driven coupling 23 is increased by at least 6mm, and the radial opposite arrangement of the driving coupling 13 and the driven coupling 23 is increased by at least 3 mm).

In a specific implementation, the driving impeller 11 may adopt various structures, including an open type, a closed type, a multi-channel type, a rotary type, etc., and the driving impeller can be driven to rotate by fluid.

In summary, according to the embodiment of the invention, the driving impeller 11 is driven to rotate by pressing fluid from outside, the driving coupler 13 drives the driven coupler 23 to synchronously rotate, so that the driven impeller 21 is driven to rotate, the pumping of blood is realized, the intervention of a motor into the body is avoided, in particular, the introduction of coil copper materials and iron core silicon steel sheet materials in the motor is avoided, the materials without biocompatibility are reduced, and the potential safety hazard is reduced; by adopting the driving mode of internal intervention, the high-flow blood can be pumped out.

Further, in the embodiment of the invention, the driving coupler 13 and the driven coupler 23 are both magnetic couplers, the driven coupler 23 rotates along with the driving coupler 13 under the action of magnetic force, the driving coupler 13 and the driven coupler 23 do not need to be directly and physically connected, the driving assembly 10 and the driven assembly 20 are connected with the driven housing 25 through the driving housing 15, the driving inner shell 151 and the driving outer shell 152 of the driving housing 15 are hermetically connected at one end to form the closed end 158, so that static sealing between the driving assembly 10 and the driven assembly 20 is realized, the sealing performance is ensured, and external fluid is prevented from entering blood.

Although specific embodiments have been described above, these embodiments are not intended to limit the scope of the disclosure, even where only a single embodiment is described with respect to a particular feature. The characteristic examples provided in the present disclosure are intended to be illustrative, not limiting, unless stated differently. In practice, the features of one or more of the dependent claims may be combined with the features of the independent claims where technically possible, according to the actual needs, and the features from the respective independent claims may be combined in any appropriate way, not merely by the specific combinations enumerated in the claims.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.

Claims

1. A heart pump, comprising a drive assembly and a driven assembly, wherein the drive assembly comprises a drive housing, a drive shaft, a drive impeller and a drive coupling, the drive housing comprises a drive inner housing and a drive outer housing, the drive inner housing is formed with an inner chamber, and the drive inner housing is provided with a fluid inlet communicated with the inner chamber; the driving shaft is arranged in the inner cavity and is in rotary connection with the driving inner shell, the driving coupler is arranged at one end of the driving shaft, which is close to the driven component, the driving impeller is arranged at the other end of the driving shaft, and the driving impeller is suitable for rotating when external fluid flows into the inner cavity along the fluid inlet and drives the driving coupler to rotate;

2. The heart pump of claim 1, wherein the drive coupling and the driven coupling are magnetic couplings, the drive coupling comprising at least a pair of magnetic steels of opposite magnetism; the magnetic steel of the driven coupler is identical to the magnetic steel of the driving coupler in logarithm and is in one-to-one correspondence with the magnetic poles of the magnetic steel of the driving coupler, and the driven coupler rotates along with the driving coupler under the action of magnetic force.

3. The heart pump of claim 2, wherein the magnetic steel of the driving coupling and the magnetic steel of the driven coupling are disposed on a plane, the driving coupling and the driven coupling are axially opposite, and the magnetic steels of the driving coupling and the driven coupling with opposite magnetic poles are axially disposed in one-to-one correspondence.

4. The heart pump of claim 2, wherein the driving coupling and the driven coupling are in cylindrical structures, the driving coupling and the driven coupling are arranged radially opposite to each other, and the magnetic steels of which the magnetic poles are opposite to each other are arranged in a one-to-one correspondence in the radial direction.

5. The heart pump of claim 1, wherein the drive inner housing is disposed in the drive outer housing, an outer chamber is formed between an outer wall of the drive inner housing and an inner wall of the drive outer housing, the drive inner housing is provided with a communication slot communicating the inner chamber with the outer chamber, and the drive outer housing is provided with a fluid outlet communicating with the outer chamber.

6. The heart pump of claim 5, wherein the drive housing has a closed-ended tubular configuration, the drive housing having a closed end and an open end, the fluid inlet and the fluid outlet being disposed at the open end, the closed end being coupled to the driven housing.

7. The heart pump of claim 6, wherein the drive inner housing and the drive outer housing are each in a cylindrical configuration, the drive inner housing and the drive outer housing being sealingly connected at one end to form the closed end, the drive inner housing being open at the open end to form the fluid inlet, the drive outer housing being open at the open end to form the fluid outlet between the drive inner housing and the drive inner housing.

8. The heart pump of claim 6, wherein the drive housing is axially coupled to the driven housing, the end of the closed end is provided with a coupling protrusion, the end of the driven housing coupled to the drive housing is provided with a recess matching the coupling protrusion, and the coupling protrusion is inserted into the recess to effect coupling.

9. The heart pump of claim 6, wherein the drive housing is radially coupled to the driven housing, the closed end outer wall is provided with a coupling segment having a diameter smaller than the drive housing outer diameter, the inner diameter of the end of the driven housing coupled to the drive housing matches the diameter of the coupling segment, and the coupling segment is inserted into the driven housing to effect the coupling.

10. The heart pump of claim 5, wherein the communication groove is disposed on the inner drive housing axially between the bottom of the drive impeller and the head of the drive impeller, and wherein the axial length of the communication groove is less than the length of the drive impeller; the communication grooves are multiple, and the multiple communication grooves are arranged at intervals along the circumferential direction of the driving inner shell.

11. The heart pump of claim 1, wherein the pump blood inlet is disposed at an end of the driven housing remote from the driven coupling, the pump blood outlet is disposed on the driven housing axially corresponding to between the driven impeller bottom and the driven impeller head, and the pump blood outlet has an axial length that is less than the length of the driven impeller; the blood pumping outlets are multiple, and the multiple blood pumping outlets are arranged at intervals along the circumferential direction of the driven shell.

12. The heart pump of claim 1, wherein a drive bearing is disposed in the drive inner housing, the drive shaft passing through the drive bearing to effect a rotational connection with the drive inner housing; the driven shell is internally provided with a driven bearing, and the driven shaft is arranged in the driven bearing in a penetrating manner so as to realize rotary connection with the driven shell.