CN213077225U

CN213077225U - Ventricular assist pump

Info

Publication number: CN213077225U
Application number: CN202020684595.8U
Authority: CN
Inventors: 余顺周
Original assignee: Shenzhen Core Medical Technology Co Ltd
Current assignee: Shenzhen Core Medical Technology Co Ltd
Priority date: 2020-04-29
Filing date: 2020-04-29
Publication date: 2021-04-30
Anticipated expiration: 2030-04-29

Abstract

The utility model provides a ventricular assist pump, which comprises a shell component, an impeller and a power mechanism, wherein the shell component is provided with a first side wall and a second side wall which are opposite, and the shell component is also provided with a pressurizing cavity which is positioned between the first side wall and the second side wall; the impeller can be rotatably accommodated in the pressurizing cavity and comprises an impeller body, a first permanent magnet and a second permanent magnet, wherein the first permanent magnet and the second permanent magnet are fixed on the impeller body and are arranged at intervals; the power mechanism comprises a first stator and a second stator which are positioned outside the booster cavity, the first stator can provide a rotating magnetic field for the first permanent magnet after being electrified so that the impeller can rotate around the central axis of the impeller, and the second stator can provide a rotating magnetic field for the second permanent magnet after being electrified so that the impeller can rotate around the central axis of the impeller. The ventricular assist pump can reliably operate for a long time.

Description

Ventricular assist pump

Technical Field

The utility model belongs to the technical field of medical instrument, especially, relate to a ventricular assist pump.

Background

Ventricular assist systems are used to assist the heart in providing adequate hemodynamics for patients with severe heart problems, and the ventricular assist pump is a key component of the ventricular assist system. However, the existing magnetic suspension ventricular assist pump has the problem of insufficient long-term reliability.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a ventricular assist pump that can long-term reliable operation.

The utility model discloses a realize like this, a ventricular assist pump, include:

a housing assembly having first and second opposing sidewalls, the housing assembly further having a plenum chamber between the first and second sidewalls;

the impeller is positioned between the first side wall and the second side wall and comprises an impeller body, a first permanent magnet and a second permanent magnet, the first permanent magnet and the second permanent magnet are fixed on the impeller body and are arranged at intervals, the first permanent magnet is close to the first side wall, and the second permanent magnet is close to the second side wall; and

the power mechanism comprises a first stator and a second stator, the first stator and the second stator are mounted on the shell assembly and are located outside the pressurizing cavity, the first stator is close to the first side wall, the second stator is close to the second side wall, the first stator can provide a rotating magnetic field for the first permanent magnet after being electrified, so that the impeller can wind the central axis of the impeller to rotate, and the second stator can provide a rotating magnetic field for the second permanent magnet after being electrified, so that the impeller can wind the central axis of the impeller to rotate.

In one embodiment, the impeller body includes a first plate portion, a second plate portion and a plurality of blades, the first plate portion and the second plate portion are opposite and spaced, the first plate portion is disposed near the first side wall, the second plate portion is disposed near the second side wall, the plurality of blades are spaced between the first plate portion and the second plate portion, and each blade is fixedly connected to the first plate portion and the second plate portion, wherein the first permanent magnet is mounted on the first plate portion, and the second permanent magnet is mounted on the second plate portion.

In one embodiment, the impeller further has a first flow passage extending through the impeller body and extending along the central axis of the impeller, and a plurality of second flow passages disposed around the first flow passage and between the first permanent magnet and the second permanent magnet, each of the plurality of second flow passages communicating with the first flow passage; the first side wall is provided with an inlet hole, and the position of the first flow passage can correspond to the position of the inlet hole.

In one embodiment, the casing assembly further includes a drainage cone disposed on the second side wall, the drainage cone is located in the pressure chamber, and the drainage cone is partially received in the first flow channel and is capable of guiding the liquid entering the first flow channel to flow into the second flow channel.

In one embodiment, the central axis of the drainage cone coincides with the central axis of the inlet hole, the ventricular assist pump further includes a magnetic assembly, the magnetic assembly includes a first magnetic member and a second magnetic member, the first magnetic member is accommodated in the drainage cone, the second magnetic member is accommodated in the impeller, the second magnetic member is annular, the central axis of the second magnetic member coincides with the central axis of the impeller, and a repulsive force is provided between the second magnetic member and the first magnetic member.

In one embodiment, the ventricular assist pump further comprises a magnetic assembly, the magnetic assembly comprises a first magnetic ring and a second magnetic ring, the first magnetic ring is mounted on the housing assembly, the central axis of the first magnetic ring is coincident with the central axis of the inlet hole, the second magnetic ring is mounted on the impeller, the central axis of the second magnetic ring is coincident with the central axis of the impeller, and an attractive force exists between the second magnetic ring and the first magnetic ring.

In one embodiment, the first magnetic ring is arranged on the first side wall; the impeller body comprises a first plate portion, a second plate portion and a plurality of blades, the first plate portion and the second plate portion are opposite and spaced, the first plate portion is close to the first side wall, the second plate portion is close to the second side wall, the plurality of blades are spaced between the first plate portion and the second plate portion, each blade is fixedly connected with the first plate portion and the second plate portion, the first permanent magnet is installed on the first plate portion, the second permanent magnet is installed on the second plate portion, the first flow channel penetrates through the first plate portion and the second plate portion, one second flow channel is formed between every two adjacent blades, and the second magnetic ring is contained in the first plate portion.

In one embodiment, the housing assembly further has a first mounting cavity and a second mounting cavity, the pressure increasing cavity is located between the first mounting cavity and the second mounting cavity, the first side wall separates the pressure increasing cavity from the first mounting cavity, the second side wall separates the pressure increasing cavity from the second mounting cavity, the first stator is accommodated in the first mounting cavity, and the second stator is accommodated in the second mounting cavity.

In one embodiment, the ventricular assist pump further comprises a control mechanism and a position detection assembly capable of detecting the position of the impeller, the control mechanism is electrically connected to both the first stator and the second stator, and the position detection assembly is electrically connected to the control mechanism, wherein:

the control mechanism and the position detection assembly are both arranged in the second installation cavity, the position detection assembly is positioned between the second side wall and the second stator, and the control mechanism is positioned on one side of the second stator far away from the position detection assembly; or, the control mechanism and the position detection assembly are both installed in the first installation cavity, the position detection assembly is located between the first side wall and the first stator, and the control mechanism is located on one side of the first stator, which is far away from the position detection assembly.

In one embodiment, a side of the first sidewall facing the second sidewall is provided with a dynamic pressure structure, and/or a side of the second sidewall facing the first sidewall is provided with a dynamic pressure structure.

The technical effects of the utility model are that: the first stator and the second stator are of a redundant design. When the first stator is electrified, the second stator can be in a non-working state, so that the impeller can keep rotating by starting the second stator when the first stator fails, normal operation of the impeller is guaranteed, when the second stator is electrified, the first stator can be in a standby state, so that when the second stator fails, the impeller can keep rotating by starting the first stator, normal operation of the impeller is guaranteed, and therefore the impeller cannot stop rotating due to failure of one stator.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention or the description of the prior art will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a cross-sectional view of a ventricular assist pump according to a first embodiment of the present invention;

FIG. 2 is a schematic diagram of the impeller of the ventricular assist pump of FIG. 1;

fig. 3 is a cross-sectional view of a ventricular assist pump according to a second embodiment of the present invention;

fig. 4 is a cross-sectional view of a ventricular assist pump according to a third embodiment of the present invention.

Description of reference numerals:

100. a ventricular assist pump; 10. a housing assembly; 101. a pressurizing cavity; 102. an inlet aperture; 11. a first side wall; 111. a first mounting cavity; 12. a second side wall; 121. a second mounting cavity; 13. a drainage cone; 14. a third side wall; 15. an inlet tube; 16. an outlet pipe; 20. an impeller; 201. a first flow passage; 211. a first plate portion; 212. a second plate portion; 22. a first permanent magnet; 23. a second permanent magnet; 213. a blade; 30. a magnetic assembly; 31. a first magnetic member; 32. a second magnetic member; 41. a first stator; 42. a second stator; 50. a control mechanism; 60. a position detection component; 70. a magnetic component; 71. a first magnetic ring; 72. a second magnetic ring;

200. a ventricular assist pump; 10', a housing assembly; 101', a pressurizing cavity; 11', a first side wall; 13', a drainage cone; 20', an impeller; 211', a first plate portion; 22', a first permanent magnet; 23', a second permanent magnet; 41', a first stator; 42', a second stator; 50', a position detecting assembly; 60', a control mechanism; 70', a magnetic component; 71', a first magnetic ring; 72', a second magnetic ring;

300. a ventricular assist pump; 101' and a pressurizing cavity; 11 ", a first side wall; 111 ", a first mounting cavity; 20 ", an impeller; 22 ", a first permanent magnet; 23 ", a second permanent magnet; 30 ", a magnetic assembly; 31 ", a first magnetic member; 32 ", a second magnetic member; 41', a first stator; 42 ", a second stator; 50 ", a position detection assembly; 60' and a control mechanism; 70 ", a magnetic assembly; 71', a first magnetic ring; 72' and a second magnetic ring.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

Example one

Referring to fig. 1, the present embodiment provides a ventricular assist pump 100, which includes a housing assembly 10, an impeller 20, a power mechanism (not shown), a magnetic assembly 30, a control mechanism 50, and a position detection assembly 60.

Referring to fig. 1, the housing assembly 10 has a first sidewall 11, a second sidewall 12 and a third sidewall 14, the first sidewall 11 is opposite to the second sidewall 12 and spaced apart from the second sidewall 12, the third sidewall 14 is fixedly connected to the first sidewall 11 and the second sidewall 12, and the first sidewall 11, the second sidewall 12 and the third sidewall 14 together enclose a pressure increasing cavity 101. I.e. the pumping cavity 101 is located between the first side wall 11 and the second side wall 12. The third side wall 14 is substantially annular.

The first side wall 11 is provided with an inlet hole 102. The inlet aperture 102 is substantially a circular aperture. Specifically in the illustrated embodiment, an inlet tube 15 is provided at the inlet aperture 102. The third side wall 14 is provided with a liquid outlet (not shown). Fluid can flow into the pumping chamber 101 through the inlet aperture 102 and out through the outlet aperture. In particular, the third side wall 14 is provided with outlet pipes 16 communicating with the outlet openings.

The casing assembly 10 further has a first mounting cavity 111 and a second mounting cavity 121, the pressure increasing cavity 101 is located between the first mounting cavity 111 and the second mounting cavity 121, the first sidewall 11 separates the pressure increasing cavity 101 from the first mounting cavity 111, and the second sidewall 12 separates the pressure increasing cavity 101 from the second mounting cavity 121.

Referring to fig. 1, the impeller 20 is rotatably accommodated in the pumping chamber 101, and the impeller 20 is located between the first sidewall 11 and the second sidewall 12. Wherein, the axial thickness of the impeller 20 is smaller than the distance between the first side wall 11 and the second side wall 12, and the radial width of the impeller 20 is smaller than the minimum inner diameter of the third side wall 14. The impeller 20 is rotatable around a central axis of the impeller 20, i.e., the central axis of the impeller 20 is a rotation axis of the impeller 20.

Wherein, impeller 20 includes impeller body (not marked in the figure), first permanent magnet 22 and second permanent magnet 23, and first permanent magnet 22 and second permanent magnet 23 all are fixed in the impeller body, and first permanent magnet 21 and second permanent magnet 23 interval set up, and first permanent magnet 22 is close to first lateral wall 11, and second permanent magnet 23 is close to second lateral wall 12. In particular, the impeller body is substantially cylindrical. The first permanent magnet 22 and the second permanent magnet 23 are annular, and further, both the first permanent magnet 22 and the second permanent magnet 23 are halbach array magnets. The first permanent magnet 22, the second permanent magnet 23, and the impeller body are coaxially disposed.

Referring to fig. 2, the impeller body includes a first plate portion 211, a second plate portion 212 and a plurality of blades 213, the first plate portion 211 and the second plate portion 212 are disposed opposite to each other at an interval, the first plate portion 211 is disposed near the first sidewall 11, the second plate portion 212 is disposed near the second sidewall 12, the plurality of blades 213 are disposed between the first plate portion 211 and the second plate portion 212 at an interval, and each blade 213 is fixedly connected to the first plate portion 211 and the second plate portion 212. Wherein the first permanent magnet 22 is mounted to the first plate portion 211 and the second permanent magnet 23 is mounted to the second plate portion 212.

Specifically, in the illustrated embodiment, the impeller 20 further has a first flow channel 201 and a plurality of second flow channels 202, the first flow channel 201 penetrates through the impeller body, the first flow channel 201 extends along a central axis of the impeller 20, the plurality of second flow channels 202 are disposed around the first flow channel 201, the plurality of second flow channels 202 are all communicated with the first flow channel 201, and the plurality of second flow channels 202 are located between the first permanent magnet 22 and the second permanent magnet 23. The position of the first flow passage 201 can correspond to the position of the inlet aperture 102 so that liquid flowing into the pumping chamber 101 from the inlet aperture 102 can largely enter the first flow passage 201 and flow out of the plurality of second flow passages 202 under the centrifugal force of rotation of the impeller 20. The direction of extension defining the axis of rotation of the impeller 20 is axial and the direction perpendicular to the axis of rotation of the impeller is radial. The first flow channel 201 then extends axially and the second flow channel 202 radially.

Specifically, in the illustrated embodiment, the first flow channel 201 penetrates the first plate portion 211 and the second plate portion 212, and one second flow channel 202 is formed between every two adjacent blades 213. That is, the plurality of blades 213 are disposed at intervals around the central axis of the impeller 20, and the plurality of second flow channels 202 are disposed at even intervals around the central axis of the impeller 20.

To facilitate the liquid entering the first flow channel 201 to enter the second flow channel 202 as much as possible, the housing assembly 10 further includes a drainage cone 13 located in the pumping chamber 101, the drainage cone 13 is connected to the second sidewall 12 and extends toward the first sidewall 11, the drainage cone 13 is partially received in the first flow channel 201, and the drainage cone 13 can guide the liquid entering the first flow channel 201 to flow into the second flow channel 202. Wherein the central axis of the drainage cone 13 coincides with the central axis of the inlet aperture 102.

Specifically, the drainage cone 13 has a cylindrical body (not shown) and a cone (not shown) formed at one end of the cylindrical body, the end of the cylindrical body far from the cone is fixedly connected to the second sidewall 12, and the diameter of the cone head gradually decreases from the end close to the cylindrical body to the end far from the cylindrical body. Further, the generatrix of the conical head is a concave arc line.

Referring to fig. 1, the power mechanism includes a first stator 41 and a second stator 42, the first stator 41 and the second stator 42 are both mounted on the housing assembly 10 and both located outside the pressure increasing cavity 101, the first stator 41 is close to the first sidewall 11, and the second stator 42 is close to the second sidewall 12. Specifically, the first side wall 11 partitions the pumping chamber 101 and the first installation chamber 111, and the second side wall 12 partitions the pumping chamber 101 and the second installation chamber 121. The first stator 41 is accommodated in the first mounting cavity 111, and the second stator 42 is accommodated in the second mounting cavity 121, so that the performance of the first stator 41 and the performance of the second stator 42 can be prevented from being influenced by liquid and external environment. The first stator 41 can provide a rotating magnetic field to the first permanent magnet 22 after being electrified so as to enable the impeller 20 to rotate around the central axis of the impeller, and the second stator 42 can provide a rotating magnetic field to the second permanent magnet 23 after being electrified so as to enable the impeller 20 to rotate around the central axis of the impeller.

Wherein the first stator 41 and the second stator 42 are of redundant design. When the first stator 41 is electrified, the second stator 42 is in a non-working state, so that when the first stator 41 fails, the second stator 42 can be started to enable the impeller 20 to keep rotating so as to ensure the normal operation of the impeller 20, when the second stator 42 is electrified, the first stator 41 is in a non-working state, so that when the second stator 42 fails, the first stator 41 can be started to enable the impeller 20 to keep rotating so as to ensure the normal operation of the impeller 20, and thus, the impeller 20 cannot stop rotating due to the failure of one stator.

Specifically, the iron cores of the first stator 41 and the second stator 42 are made of silicon steel, when one of the first stator 41 and the second stator 42 is energized, a magnetic force (attraction force) is generated between the other non-operating stator and the corresponding permanent magnet, so that the impeller 20 realizes the floating rotation in the pumping cavity 101 under the magnetic force between the first stator 41 and the first permanent magnet 22 and the magnetic force between the second stator 42 and the second permanent magnet 23 and under the acting and reacting forces between the liquid and the first side wall 11, the second side wall 12, and the third side wall 14.

In order to further ensure that the impeller 20 does not collide with the wall of the pumping chamber 101 when rotating in the pumping chamber 101, a dynamic pressure structure (not shown) is provided on the wall of the pumping chamber 101 or the impeller 20. The hydrodynamic pressure structure is capable of generating a hydrodynamic thrust to the impeller 20 when the impeller 20 rotates, and the magnitude of the hydrodynamic thrust varies with the distance between the impeller 20 and the hydrodynamic pressure structure, and the closer the impeller 20 is to the hydrodynamic pressure structure, the greater the hydrodynamic thrust is, thereby further ensuring that the impeller 20 is in a floating state without contacting and colliding with the cavity wall of the pumping cavity 101. In order to reduce the damage of the impeller 20 to blood cells, the dynamic pressure structure is preferably provided on the wall of the pressurizing chamber 101. In this embodiment, a dynamic pressure structure is disposed on at least one of the first side wall 11 and the second side wall 12, and in this case, the dynamic pressure structure may be disposed as follows:

in one embodiment, the dynamic pressure structure is disposed on a side of the first sidewall 11 facing the second sidewall 12, and the impeller 20 is subjected to a first hydraulic thrust force by the dynamic pressure structure facing the second sidewall 12; in another embodiment, the dynamic pressure structure is disposed on the side of the second sidewall 12 facing the first sidewall 11, and the impeller 20 is subjected to the second hydraulic thrust of the dynamic pressure structure facing the first sidewall 11; in a further embodiment, the dynamic pressure structure is disposed on each of the first sidewall 11 and the second sidewall 12, that is, the dynamic pressure structure is disposed on both the side of the first sidewall 11 facing the second sidewall 12 and the side of the second sidewall 12 facing the first sidewall 11.

It should be noted that the manner in which the dynamic pressure structure is provided on the cavity wall of the pressurizing cavity 101 is not limited to the above-described manner, and for example, the dynamic pressure structure may be provided on the third side wall 14.

The magnetic assembly 30 includes a first magnetic member 31 and a second magnetic member 32. The first magnetic member 31 is accommodated in the bleed cone 13. The first magnetic member 31 is annular, and the central axis of the first magnetic member 13 coincides with the central axis of the drainage cone 13. The second magnetic member 32 is accommodated in the second plate portion 212. The second magnetic member 32 is ring-shaped, the central axis of the second magnetic member 32 coincides with the rotation axis of the impeller 20, the position of the first magnetic member 31 corresponds to the position of the second magnetic member 32, and the second magnetic member 32 and the first magnetic member 31 have a repulsive force therebetween, i.e., the polarities of the opposite sides of the first magnetic member 31 and the second magnetic member 32 are the same, so as to further ensure the balance of the impeller 20 in the radial direction. Since the guiding cone 13 is partially received in the first flow channel 201, the outer diameter of the first magnetic member 31 is smaller than the inner diameter of the second magnetic member 32, i.e. the second magnetic member 32 is located at the outer periphery of the first magnetic member 31. It can be understood that, when the inner side of the first magnetic member 31 is an N pole and the outer side is an S pole, the inner side of the second magnetic member 32 is an S pole and the outer side is an N pole; when the inner side of the first magnetic member 31 is an S pole and the outer side is an N pole, the inner side of the second magnetic member 32 is an N pole and the outer side is an S pole. Thus, a repulsive force is formed between the first magnetic member 31 and the second magnetic member 32, and when the impeller 20 is radially offset, the repulsive force is increased at a relatively close distance between the first magnetic member 31 and the second magnetic member 32 to adjust the radial position of the impeller 20. Specifically, the second magnetic member 32 is housed in the second plate portion 212.

The control mechanism 50 is electrically connected to the first stator 41, and the control mechanism 50 is electrically connected to the second stator 42, and the control mechanism 50 can control the first stator 41 and the second stator 42 to rotate the impeller 20. Specifically, the control mechanism 50 is installed in the first installation cavity 111 or the second installation cavity 121 to be protected from liquid or external environment.

The position detecting assembly 60 is electrically connected to the control mechanism 50, the position detecting assembly 60 can detect the position of the impeller 20 and can transmit the detected position information to the control mechanism 50, and the control mechanism 50 can control the operation of the first stator 41 and the second stator 42 according to the position information, for example, adjust the output current or power, adjust the rotating magnetic field generated by the first stator 41 and the rotating magnetic field generated by the second stator 42. That is, when the position detecting assembly 60 detects that the impeller 20 is deviated from the preset position, the control mechanism 50 adjusts the position of the impeller 20 by controlling the first stator 41 to adjust the magnetic force acting with the first permanent magnet 22 or by controlling the second stator 42 to adjust the magnetic force acting with the second permanent magnet 23. The placement of the position sensing assembly 60 enhances the control of the power mechanism by the control mechanism 50 and improves the reliability of the ventricular assist pump 100 during use.

Specifically, the position detecting assembly 60 is located between the first stator 41 and the first sidewall 11, or the position detecting assembly 60 is located between the second stator 42 and the second sidewall 12, so that the position detecting assembly 60 is as close to the impeller 20 as possible, and the sensitivity and reliability of the position detecting assembly 60 for detecting the position of the impeller 20 are improved. Specifically, the position detecting assembly 60 is located in the first mounting cavity 111 or the second mounting cavity 121 to avoid being affected by liquid or external environment. In the embodiment shown in fig. 1 in particular, the control mechanism 50 is installed in the second installation cavity 121, and the control mechanism 50 is electrically connected to both the first stator 41 and the second stator 42 to control the first stator 41 and the second stator 42 to work; the position detecting assembly 60 is electrically connected to the control mechanism 50, and the position detecting assembly 60 is installed in the second installation cavity 121 and located between the second side wall 12 and the second stator 42, wherein the control mechanism 50 is located on a side of the second stator 42 far away from the position detecting assembly 60.

Specifically, the position detecting assembly 60 includes a detecting circuit board (not shown) and a position sensor disposed on the detecting circuit board and electrically connected to the detecting circuit board, the position sensor being located on a side of the detecting circuit board close to the impeller. The position sensor is, for example, a hall sensor.

Example two

Referring to fig. 3, the second embodiment provides a ventricular assist pump 200, which is different from the first embodiment in that:

the ventricular assist pump 200 is not provided with the magnetic assembly 30 of the ventricular assist pump 100 of embodiment 1, the ventricular assist pump 200 includes a magnetic assembly 70 ', the magnetic assembly 70' includes a first magnetic ring 71 'and a second magnetic ring 72', the first magnetic ring 71 'is mounted to the housing assembly 10', a central axis of the first magnetic ring 71 'coincides with a central axis of the inlet hole 102', the second magnetic ring 72 'is mounted to the impeller 20', a central axis of the second magnetic ring 72 'coincides with a rotational axis of the impeller 20', and an attractive force is provided between the second magnetic ring 72 'and the first magnetic ring 71'.

When the central axis of the second magnetic ring 72 ' deviates from the central axis of the diversion cone 13 ', the impeller 20 ' can be reset under the magnetic attraction of the first magnetic ring 71 ' and the second magnetic ring 72 ', so as to drive the impeller 20 ' to reset, and thus the position of the impeller 20 ' is adjusted. At this time, when only the second stator 42 ' is energized, the impeller 20 ' rotates in a suspended manner in the pressurizing chamber 101 ' under the combined action of the acting force between the second stator 42 ' and the second permanent magnet 23 ', the attractive force between the first stator 41 ' and the first permanent magnet 22 ', the attractive force between the first magnetic ring 71 ' and the second magnetic ring 72 ', the hydrodynamic thrust of the dynamic pressure structure, and the like; when only the first stator 41 'is energized, the impeller 20' rotates in a suspended manner in the pressurizing cavity 101 'under the combined action of the acting force between the first stator 41' and the first permanent magnet 22, the attractive force between the second stator 42 'and the second permanent magnet 23', the attractive force between the first magnetic ring 71 'and the second magnetic ring 72', the hydrodynamic force of the dynamic pressure structure, and the like.

It can be understood that, when the side of the first magnetic ring 71 'facing the impeller 20' is an N pole and the side facing away from the impeller 20 'is an S pole, the side of the second magnetic ring 72' facing the first magnetic ring 71 'is an S pole and the side facing away from the first magnetic ring 71' is an N pole; when the first magnetic ring 71 'has an S pole on the side facing the impeller 20' and an N pole on the side facing away from the impeller 20 ', the second magnetic ring 72' has an N pole on the side facing the first magnetic ring 71 'and an S pole on the side facing away from the first magnetic ring 71'.

Specifically, the first magnetic ring 71 'is the same size as the second magnetic ring 72'. In the present embodiment, the first magnetic ring 71 'is mounted on the first sidewall 11', and the second magnetic ring 72 'is accommodated in the first plate portion 211'.

EXAMPLE III

Referring to fig. 4, a ventricular assist pump 300 is provided in the third embodiment, which is different from the first embodiment in that the ventricular assist pump 300 not only has a magnetic assembly 30 ", and the magnetic assembly 30" has the same structure and arrangement as the magnetic assembly 30 of the ventricular assist pump 100 in the first embodiment, but also includes a magnetic assembly 70 ", and the magnetic assembly 30" has the same structure and arrangement as the magnetic assembly 70' of the ventricular assist pump 200 in the second embodiment.

At this time, when only the second stator 42 "is energized, the impeller 20" rotates in a suspended manner in the pressurizing cavity 101 "under the combined action of the acting force between the second stator 42" and the second permanent magnet 23 ", the attractive force between the first stator 41" and the first permanent magnet 22 ", the attractive force between the first magnetic ring 71" and the second magnetic ring 72 ", the repulsive force between the first magnetic member 31" and the second magnetic member 32 ", the hydrodynamic force of the dynamic pressure structure, and the like; when only the first stator 41 "is energized, the impeller 20" rotates in a floating manner in the pressurizing chamber 101 "under the combined action of the acting force between the first stator 41" and the first permanent magnet 22 ", the attractive force between the second stator 42" and the second permanent magnet 23 ", the attractive force between the first magnet 71" and the second magnet 72 ", the repulsive force between the first magnetic member 31" and the second magnetic member 32 ", the hydrodynamic force of the dynamic pressure structure, and the like.

Specifically, in the embodiment shown in fig. 4, the control mechanism 50 "and the position detecting assembly 60" are both installed in the first installation cavity 111 ", the position detecting assembly 60" is electrically connected to the control mechanism 50 ", and the position detecting assembly 60" is located between the first side wall 11 "and the first stator 41", wherein the control mechanism 50 "is located on the side of the first stator 41" far away from the position detecting assembly 60 ".

The foregoing is only a preferred embodiment of the present invention, and the technical principles of the present invention have been specifically described, and the description is only for the purpose of explaining the principles of the present invention, and should not be construed as limiting the scope of the present invention in any way. Any modifications, equivalents and improvements made within the spirit and principles of the invention and other embodiments of the invention without the creative effort of those skilled in the art are intended to be included within the protection scope of the invention.

Claims

1. A ventricular assist pump, comprising:

2. A ventricular assist pump as claimed in claim 1, wherein the impeller body includes a first plate portion, a second plate portion and a plurality of blades, the first plate portion and the second plate portion are opposed and spaced apart, the first plate portion is disposed adjacent the first sidewall, the second plate portion is disposed adjacent the second sidewall, the plurality of blades are spaced apart between the first plate portion and the second plate portion, each blade fixedly connects the first plate portion and the second plate portion, wherein the first permanent magnet is mounted to the first plate portion and the second permanent magnet is mounted to the second plate portion.

3. A ventricular assist pump as claimed in claim 1, wherein the impeller further has a first flow passage extending through the impeller body and along a central axis of the impeller and a plurality of second flow passages disposed around the first flow passage and between the first and second permanent magnets, each of the plurality of second flow passages communicating with the first flow passage; the first side wall is provided with an inlet hole, and the position of the first flow passage can correspond to the position of the inlet hole.

4. A ventricular assist pump as claimed in claim 3, wherein the housing assembly further includes a drainage cone disposed on the second sidewall, the drainage cone being located within the pumping chamber and partially received within the first flow passage and capable of directing fluid entering the first flow passage toward the second flow passage.

5. A ventricular assist pump as claimed in claim 4, wherein the central axis of the bleed cone and the central axis of the inlet port coincide, the ventricular assist pump further comprising a magnetic assembly including a first magnetic member and a second magnetic member, the first magnetic member being received in the bleed cone, the second magnetic member being received in the impeller, the second magnetic member being annular, the central axis of the second magnetic member coinciding with the central axis of the impeller, the second magnetic member having a repulsive force with the first magnetic member.

6. A ventricular assist pump as claimed in claim 3 or 5, wherein the ventricular assist pump further comprises a magnetic assembly including a first magnetic ring and a second magnetic ring, the first magnetic ring mounted to the housing assembly with a central axis coincident with a central axis of the inlet port, the second magnetic ring mounted to the impeller with a central axis coincident with a central axis of the impeller, an attractive force being provided between the second magnetic ring and the first magnetic ring.

7. A ventricular assist pump as claimed in claim 6, wherein the first magnetic ring is mounted to the first sidewall; the impeller body comprises a first plate portion, a second plate portion and a plurality of blades, the first plate portion and the second plate portion are opposite and spaced, the first plate portion is close to the first side wall, the second plate portion is close to the second side wall, the plurality of blades are spaced between the first plate portion and the second plate portion, each blade is fixedly connected with the first plate portion and the second plate portion, the first permanent magnet is installed on the first plate portion, the second permanent magnet is installed on the second plate portion, the first flow channel penetrates through the first plate portion and the second plate portion, one second flow channel is formed between every two adjacent blades, and the second magnetic ring is contained in the first plate portion.

8. A ventricular assist pump as claimed in claim 1, wherein the housing assembly further has a first mounting cavity and a second mounting cavity, the pumping cavity is located between the first mounting cavity and the second mounting cavity, the first sidewall separates the pumping cavity from the first mounting cavity, the second sidewall separates the pumping cavity from the second mounting cavity, the first stator is received in the first mounting cavity, and the second stator is received in the second mounting cavity.

9. A ventricular assist pump as claimed in claim 8, further comprising a control mechanism electrically connected to both the first stator and the second stator, and a position detection assembly capable of detecting a position of the impeller, the position detection assembly being electrically connected to the control mechanism, wherein:

10. A ventricular assist pump as claimed in claim 1, wherein a side of the first sidewall facing the second sidewall is provided with a dynamic pressure structure, and/or a side of the second sidewall facing the first sidewall is provided with a dynamic pressure structure.