CN113082507B

CN113082507B - Apply to artificial heart's magnetic suspension device

Info

Publication number: CN113082507B
Application number: CN202110517375.5A
Authority: CN
Inventors: 栗田伸幸; 徐博翎; 吴婷婷; 葛婉宁
Original assignee: Suzhou University
Current assignee: Xu Boling; Suzhou University
Priority date: 2021-05-12
Filing date: 2021-05-12
Publication date: 2023-01-13
Anticipated expiration: 2041-05-12
Also published as: CN113082507A

Abstract

The application discloses apply to artificial heart's magnetic suspension device includes: a housing (1) comprising an inner cavity and an inlet and an outlet communicating with the inner cavity; a stator connected to the housing (1); and a rotor movably disposed within the inner cavity, the rotor comprising a rotor disk (40) and an impeller coupled to the rotor disk (40), the rotor disk (40) comprising a first surface (403) disposed toward the stator and a second surface (404) disposed opposite the first surface (403), the impeller coupled to the second surface (404). In this application, the impeller is located the second surface of rotor dish, and it is not located between stator and the rotor, can effectually shorten the distance between stator and the rotor, reduces the air gap to the power loss that has significantly reduced has improved work efficiency.

Description

Apply to artificial heart's magnetic suspension device

Technical Field

The application relates to the technical field of medical instruments, in particular to a magnetic suspension device applied to an artificial heart.

Background

The artificial heart is used for complementing or replacing the blood pumping function of the heart, and provides a new medical means for treating the patients with the unexpected cardiogenic shock and the heart failure.

Artificial hearts go through roughly three generations: the first generation of artificial heart adopts a pulsating blood pump, simulates the motion of the heart through the volume change of the inner cavity of the pump, outputs pulsating flow, sends blood from the left ventricle to the aorta and achieves the effect of assisting the ventricles. However, the implantation of this generation of artificial heart is highly invasive, has a high mechanical failure rate, and has low blood compatibility due to the influence of mechanical structure.

The second generation artificial heart adopts the axial flow rotary blood pump, has mechanical bearing, and the rotatory output through the impeller is regularly flowed, sends blood into the aorta from the left ventricle, reaches the effect of supplementary ventricle, and this generation artificial heart volume reduces greatly, lets the blood pump can implant people's thorax, compares that the first generation blood pump can only implant the abdominal cavity, and the patient's that has significantly reduced misery increases patient's quality of life. However, most of the blood pumps are still implanted in the abdominal cavity, only a small part of the blood pumps are implanted in the thoracic cavity, and the implantation mode is still highly invasive. When the blood pump works, blood submerges the bearing, and the bearing rotating at high speed causes blood damage, so that the blood compatibility of the whole device is reduced.

A third generation artificial heart adopts a suspended rotary blood pump which is divided into a hydraulic suspended pump and a magnetic suspended pump, although the hydraulic suspended pump has smaller volume and reduces the invasiveness, the hydraulic suspended pump mainly utilizes dynamic pressure suspension generated by fluid on a reducing structure, cannot suspend at low rotating speed, and has no excellent blood compatibility which is expected before. Therefore, the magnetic suspension pump is generated as soon as possible, the rotor of the magnetic suspension pump is not contacted with the periphery, the damage of the friction of the bearing to the blood can be avoided, the blood compatibility is good, the volume is small, the magnetic suspension pump can be implanted into the thoracic cavity, and the magnetic suspension pump is a blood pump with the best performance at present.

According to the clinical data at home and abroad, the right heart failure of 40% of patients occurs after the left heart assist, and the double heart assist is needed. If two independent ventricular assist devices are used for biventricular assist, the flow rate of the systemic circulation and the pulmonary circulation are not matched, and the problem of pulmonary or vena cava congestion is caused. Therefore, a magnetic suspension type artificial heart capable of double heart assistance is a better solution.

The artificial heart that can carry out double heart assistance among the prior art mostly adopts the magnetic suspension device of single stator, the structure of single rotor, and the impeller is located between rotor and the stator, and it has following defect:

firstly, the impeller is positioned between the rotor and the stator in a structural form, an air gap between the rotor and the stator is increased, the size of the air gap is related to power efficiency, and under the condition of generating the same torque, the larger the air gap is, the larger the power loss is, and the lower the efficiency is;

secondly, passive suspension of the rotor in the existing artificial heart is realized by the acting force of the magnet and the magnet during suspension, the anti-torsion capability is weak, and when extreme conditions occur during the movement of a human body, the magnetic suspension rotor can collide the wall, so that adverse events such as thrombus, halt and the like can occur;

in addition, although the third generation artificial heart eliminates the blood damage caused by the friction of the bearing through a suspension system (magnetic suspension or/and hydraulic suspension), the blood damage caused by high rotating speed is not effectively controlled, so that the blood compatibility is poor, and if the blood compatibility is poor, the blood damage level of the magnetic suspension artificial heart is possibly higher than that of the artificial heart adopting a mechanical bearing.

Disclosure of Invention

Aiming at the defects in the technology, the magnetic suspension device applied to the artificial heart is provided, the power loss is lower, and the working efficiency is higher.

In order to solve the above technical problem, the present application provides a magnetic suspension device for an artificial heart, including:

a housing including an interior chamber and an inlet and an outlet in communication with the interior chamber;

a stator coupled to the housing; and

the rotor is movably arranged in the inner cavity and comprises a rotor disc, a plurality of magnets arranged on the rotor disc and an impeller connected with the rotor disc; the rotor disk comprises a first surface disposed toward the stator and a second surface disposed opposite the first surface, the impeller being attached to the second surface; the magnets are uniformly distributed on a circle which takes the center of the rotor disc as the center of a circle, and the number of pole pairs of the magnets is a multiple of 4;

wherein the stator further comprises: the winding device comprises a tooth part, a first winding and a second winding, wherein the first winding and the second winding are arranged on the tooth part; the first winding is closer to the rotor than the second winding, and the number of turns of the second winding is set to be 1.5 to 2.5 times that of the first winding; the first winding is wound into a three-phase eight-level form, and the second winding is wound into a two-phase six-level form; the ratio L/D of the length L of the tooth part to the outer diameter D of the stator is in the following range: 16/45< = L/D < =32/45.

Further, the magnetic suspension device for the artificial heart comprises a plurality of first sensors connected to the housing, and the first sensors are used for detecting the distance between the first sensors and the rotor disc.

Further, the first rotor further includes a plurality of first sensing members disposed on the rotor disc, and the plurality of first sensing members are uniformly distributed on a circle centered at the center of the rotor disc.

Further, the magnetic suspension device for the artificial heart further comprises a plurality of second sensors connected to the housing, wherein the second sensors are used for sensing the first sensing elements.

Further, the magnetic levitation device applied to the artificial heart further comprises a second sensing member connected to the rotor disc, and the zero position of the rotor is determined by the second sensing member sensed by the second sensor.

Further, the housing comprises one number of cavities; the number of the rotors is one, and the rotors are arranged in the inner cavity.

Further, the number of the inner cavities of the shell is two, which are respectively: a first lumen and a second lumen spaced apart from each other; the number of the rotors is two, the two rotors are respectively arranged in the first inner cavity and the second inner cavity, and each rotor is correspondingly provided with one stator.

Further, the inlet comprises a first inlet communicated with the first inner cavity and a second inlet communicated with the second inner cavity, the outlet comprises a first outlet communicated with the first inner cavity and a second outlet communicated with the second inner cavity, the axes of the first inlet and the second inlet are the same as the rotation axis of the rotor, and the two stators are respectively sleeved on the first inlet and the second inlet.

Further, a partition plate is arranged in the shell and divides the inner cavity into the first inner cavity and the second inner cavity.

Further, the magnetic suspension device applied to the artificial heart further comprises a rotating shaft which is rotatably connected to the partition plate, and the rotating shaft is connected between the rotor disks of the two rotors.

Compared with the prior art, the application has the beneficial effects that: in the application, the impeller is positioned on the second surface of the rotor disc and is not positioned between the stator and the rotor, so that the distance between the stator and the rotor can be effectively shortened, and an air gap is reduced, thereby greatly reducing power loss and improving working efficiency; and the impeller is integrated on the rotor disc, so that the overall size of the magnetic suspension device applied to the artificial heart can be reduced, and the magnetic suspension device is more convenient to implant into a human body. In addition, the stator is wound with the first winding and the second winding, axial suspension can be actively realized by changing the current on the first winding, and the rotor can be driven to return to the right position by the second winding, so that the anti-torsion capacity of the rotor is greatly enhanced, the safety and the reliability of the magnetic suspension device for applying the artificial heart to the artificial heart are higher, and the service life is longer.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts. Wherein:

fig. 1 is a plan view of a magnetic levitation apparatus applied to an artificial heart in the present application.

Fig. 2 isbase:Sub>A sectional view ofbase:Sub>A portionbase:Sub>A-base:Sub>A in fig. 1.

Fig. 3 is an exploded view of a magnetic levitation apparatus applied to an artificial heart in the present application.

Fig. 4 is a schematic view of the first stator attached to the first housing in the present application.

Fig. 5 is a schematic view of the structure of the first rotor in the present application.

Fig. 6 is a schematic view of another view direction of the first rotor in the present application.

Fig. 7 is a bottom view of the first rotor in the present application.

Fig. 8 is a top view of the first rotor provided with a ring plate in the present application.

Fig. 9 is a sectional view of a magnetic levitation apparatus applied to an artificial heart in the present application, in which a rotating shaft is connected between two rotors.

Fig. 10 is a schematic view of the structure of the stator in the present application, and the winding is not shown.

Fig. 11 is a schematic view of the position of the magnetic poles formed by the second winding and the magnetic poles formed by the magnets on the rotor in the present application.

Fig. 12 is a schematic view of another position of the magnetic poles formed by the second winding of the present application and the magnetic poles formed by the magnets on the rotor.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be further noted that, for the convenience of description, only some of the structures related to the present application are shown in the drawings, not all of the structures. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.

The terms "including" and "having," as well as any variations thereof, in this application are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein may be combined with other embodiments.

As shown in fig. 1 to 10, a magnetic levitation apparatus for an artificial heart corresponding to a preferred embodiment of the present application includes a housing 1 having an inner cavity, a stator connected to the housing 1, and a rotor movably disposed in the inner cavity of the housing 1. The shell 1 is provided with an inlet and an outlet which are communicated with the inner cavity of the shell, the stator is arranged corresponding to the rotor and can drive the rotor to suspend and rotate, so that blood is driven to flow into the inner cavity from the inlet and then flow out from the outlet.

It can be understood that the magnetic levitation device applied to the artificial heart can be set in the form of single-ventricle auxiliary blood supply or double-ventricle auxiliary blood supply, and for the magnetic levitation device of single-ventricle auxiliary blood supply, the housing 1 includes one inner cavity, one rotor is arranged in the inner cavity, and the rotor is correspondingly provided with one stator.

The magnetic levitation device in this embodiment has a function of double-ventricle auxiliary blood supply, and as shown in fig. 2 and fig. 3, the housing 1 includes two inner cavities, namely a first inner cavity 100 and a second inner cavity 110; the number of the inlets is two, namely a first inlet 101 and a second inlet 111; two outlets are also provided, a first outlet 102 corresponding to the first inlet 101 and a second outlet 112 corresponding to the second inlet 111.

Correspondingly, a magnetic levitation device for an artificial heart has two stators and two rotors. The two stators are respectively a first stator 2 and a second stator 3 which are positioned at two ends of the shell 1, the two rotors are respectively a first rotor 4 and a second rotor 5, the first stator 2 and the first rotor 4 are correspondingly arranged, and the second stator 3 and the second rotor 5 are correspondingly arranged.

In order to facilitate the installation of the components inside the casing 1, the casing 1 is provided in a split form, in this embodiment, the casing 1 includes a first casing 10 and a second casing 11 connected to each other, and a partition 12 is connected between the first casing 10 and the second casing 11. The first housing 10 and the second housing 11 can be detachably connected by any suitable means, such as bolts, and the parts can be conveniently mounted in the corresponding housings after the two housings are separated.

The first housing 10 and the second housing 11 are similar in structure and cooperate to form an inner cavity, which is divided into a first inner cavity 100 and a second inner cavity 110 by a partition 12. The partition 12 may be compressed between the first housing 10 and the second housing 11 by a compression method.

The first rotor 4 is disposed in the first inner chamber 100, the first inlet 101 and the first outlet 102 are disposed on the first housing 10 and communicate with the first inner chamber 100, and blood enters from the first inlet 101, passes through the first rotor 4, and is discharged through the first outlet 102. Accordingly, the second rotor 5 is disposed in the second inner chamber 110, the second inlet 111 and the second outlet 112 are disposed on the second housing 11 and communicated with the second inner chamber 110, and the blood enters from the second inlet 111, passes through the second rotor 5, and is discharged from the second outlet 112.

In a preferred embodiment, the first rotor 4 and the second rotor 5 are symmetrical to each other, for example, mirror-symmetrical or center-symmetrical, so that on one hand, the overall size of the magnetic levitation device applied to the artificial heart can be reduced; on the other hand, the two stators are separated at the two ends of the shell 1 by the two rotors, the mutual influence is small, and the influence between the stators and the rotors which are not driven by the stators is small, which is beneficial to improving the working reliability of the magnetic suspension device applied to the artificial heart.

In this embodiment, the rotation axes of the two rotors are coincident, and the first inlet 101 and the second inlet 111 are both substantially tubular and are arranged coaxially with the rotation axes.

The two stators are located outside the first housing 10 and are sleeved on the inlet. The first stator 2 is sleeved on the first inlet 101, and the second stator 3 is sleeved on the second inlet 111. For example, in this embodiment, the first casing 10 is provided with a plurality of positioning pillars 104, a pressing plate 105 is disposed outside the stator, and the stator can be pressed on the casing by bolts penetrating through the pressing plate 105 and screwing with the positioning pillars 104.

In this embodiment, the two stators (the first stator 2 and the second stator 3) have the same structure, and the two rotors (the second rotor 4 and the second rotor 5) have the same structure, so that the technical solution of the present application will be described below by taking the first stator 2 and the first rotor 4 engaged therewith as an example.

As shown in fig. 2 and 4, the first stator 2 includes a plurality of teeth 20 surrounding the outside of the first inlet 101 and a first winding 21 wound on the teeth 20, and a stator slot is formed between two adjacent teeth 20. The first winding 21 is used for driving the first rotor 4 corresponding to the first stator 2 to rotate, and controlling the axial position (axial direction refers to the direction in which the rotation axis of the first rotor 4 is located) of the first rotor 4, so that the first rotor 4 can be suspended in the first inner cavity 100. In a preferred embodiment, the first winding 21 is wound in three-phase eight-stage form, which enables a higher torque to be output while maintaining the rotational speed.

The number of teeth 20 is not limited, and the number of teeth 20 is a multiple of 3 in order to make it possible to wind the teeth into three phases, and in the present embodiment, the number of teeth 20 is 12 as a preferred embodiment.

The first rotor 4 is arranged corresponding to the first stator 2, and is driven by the first stator 2 to rotate, and the first rotor 4 generates hydraulic pressure after rotating so as to suck blood from the first inlet 101 and send the blood out from the first outlet 102. Specifically, as shown in fig. 5, the first rotor 4 includes a rotor disk 40 and a plurality of magnets 41 mounted on the rotor disk 40. The magnets herein are preferably magnets.

The rotor disk 40 has a substantially flat cylindrical shape, and an outer peripheral surface thereof is fitted into the first cavity 100 so as to be smoothly rotatable in the first cavity 100. The magnets 41 are mounted on the first surface 403 of the rotor disc 40 facing the first stator 2, and have alternating N and S poles for driving the first rotor 4 to rotate under the magnetic force of the first stator 2. In order to enable the magnet 41 to reliably drive the first rotor 4 to rotate, the number of pole pairs is preferably a multiple of 4, the pole pair number refers to the number of pairs of magnetic poles, in the magnetic poles facing the stator, one N pole and one S pole form a pair of magnetic poles, the number of stator slots is set to be a multiple of 3, and the number of rotor pole pairs is set to be a multiple of 4, so that the least common multiple of the number of stator slots and the number of rotor pole pairs can be increased, the reduction of vibration and magnetic levitation robustness caused by cogging torque and torque ripple caused by large magnetic resistance change can be avoided, and further, the blood compatibility and the system life are improved. In this embodiment, the number of the magnets 41 is 8, and the magnets are uniformly distributed on a circle using the center of the rotor disc 40 as a circle center, and the number of the corresponding pole pairs is 4.

As a preferred embodiment, the magnet 41 is in a flat plate shape, which can increase the mutual relative area of the magnetic fields between the stator and the rotor, increase the torque output, further reduce the overall volume of the magnetic suspension device applied to the artificial heart, promote the miniaturization of the magnetic suspension device applied to the artificial heart, and facilitate the implantation into the human body.

As shown in fig. 4, an annular groove 103 is formed at a position of the first housing 10 corresponding to the first stator 2, and the teeth 20 of the first stator 2 extend into the annular groove 103, so that the teeth 20 and the magnet 41 are closer to each other, thereby efficiently driving the first rotor 4 to rotate and reducing power loss.

As shown in fig. 5, the rotor disk 40 is provided with a plurality of fan blade portions 401 radially distributed about the center of the rotor disk 40. Specifically, the rotor disc 40 is provided with a plurality of axial flow holes 400, and the plurality of axial flow holes 400 are uniformly distributed on a circle centered on the center of the rotor disc 40. The axial flow holes 400 are inclined axial flow holes, the hole walls 4000 of which are arranged obliquely, and the inclination directions of the hole walls 4000 of all the axial flow holes 400 coincide in any rotatable direction of the rotor disk 40, so that the solid portions between two adjacent axial flow holes 400 form the above-described fan blade portions 401. After the rotor disk 40 rotates, the fan blade portion 401 will generate axial thrust to suck the blood at the first inlet 101 into the first inner cavity 100, which is similar to an axial flow pump in principle.

The number of axial holes 400 is not limited, and in the present embodiment, the number thereof is 6. The shape of the axial flow hole 400 is not limited, and in the present embodiment, the axial flow hole has a substantially triangular shape. In a preferred embodiment, the axial flow holes 400 are gradually increased in size from a position near the center of the rotor disk 40 to increase the area through which the flow can pass.

Further, as shown in fig. 6 and 7, an impeller is disposed on a second surface 404 of the rotor disc 40 facing the partition 12, the impeller includes a plurality of blades 402, the plurality of blades 402 are uniformly distributed around the center of the rotor disc 40, and the blades 402 do not point to the circle center, and form a certain angle with the diameter of the rotor disc 40, so as to improve the centrifugal effect generated during rotation. The inner ends 4020 of the blades 402 are located near the center of the rotor disk 40 and on the blade portion 401, and the outer ends 4021 thereof extend to the outer edge of the rotor disk 40. Thus, the fluid passage formed between two adjacent blades 402 is gradually enlarged from the inner end to the outer end, and when the rotor disc 40 rotates at a high speed, the blood will be thrown to the outer edge of the rotor disc 40 under the centrifugal force, so as to accelerate the blood away from the first outlet 102, which is similar to a centrifugal pump in principle. Preferably, the axis of the outlet is substantially tangential to the lumen, thereby facilitating blood flow into the outlet.

Through set up flabellum portion 401 and blade 402 on first rotor 4 for first rotor 4 forms the form of doublestage impeller, blood is when through first rotor 4, carry out axial acceleration by flabellum portion 401 earlier, later carry out radial acceleration by blade 402, can produce bigger drive power, it accelerates through first inner chamber 100 to order about blood, thereby under the circumstances of guaranteeing blood supply, can reduce first rotor 4's rotational speed, the effectual blood damage that leads to because of high-speed rotation that has alleviateed, be favorable to improving blood compatibility. In addition, the blade part 401 and the blade 402 can be integrally formed on the rotor disk, and the strength and rigidity are better.

In addition, it is understood that in the present application, the blade part 401 and the blade 402 are integrated on the rotor disk 40, and there is no need to provide an impeller between the first stator 2 and the first rotor 4. Therefore, the impeller is not blocked on the magnetic path between the first stator 2 and the first rotor 4, the distance between the first stator 2 and the first rotor 4 can be effectively shortened, and the air gap is reduced, so that the power loss is greatly reduced, and the working efficiency is improved; and the overall size of the magnetic suspension device applied to the artificial heart is also reduced, so that the magnetic suspension device is more convenient to implant into a human body.

As shown in fig. 5, the Z axis is the rotation axis of the first rotor 4, and the X axis, the Y axis and the Z axis are perpendicular to each other to form a rectangular spatial coordinate system. During the rotation of the first rotor 4, it may be twisted and swung to be inclined around the X-axis or the Y-axis due to the clearance with the first cavity 100. In order to improve the anti-torsion capability, as shown in fig. 2 and 4, in the present embodiment, the tooth portion 20 is further wound with a second winding 22, which can magnetically control the torsion of the first rotor 4, so as to keep the first rotor 4 upright, for example, when the first rotor 4 tilts around the X-axis or the Y-axis, it can adjust the magnitude of the attraction/repulsion force of the magnets 41 at different positions by controlling the magnitude of the currents at different phases of the second winding 22, so as to drive the first rotor 4 to return to the upright position; for another example, it can control the current frequency of the second winding 22 to change the polarity of the portion corresponding to the magnet 41, so that the attraction or repulsion state of the magnet 41 can be changed to drive the first rotor 4 to return to the upright state, specifically, as shown in fig. 11 and 12, the position of the magnetic poles formed by the two-phase six-stage second winding 22 and the eight magnetic poles formed by the eight magnets 41 on the rotor are schematically shown, in the figure, the numbers representing the magnetic poles of the magnet 41 are N1 to N4 and S1 to S4, and the numbers representing the magnetic poles of the second winding 22 are N1 to N3 and S1 to S3, obviously, when the rotor and the second winding 22 are in the relative position shown in fig. 11, the magnets in the upper half of the Y axis in the figure are mainly acted by the repulsion force, and the magnets in the lower half are mainly acted by the attraction force, and then the rotor will swing around the Y axis; when the rotor and the second winding 22 are in the relative position shown in fig. 12, the magnets in the right half of the X-axis in the figure are mainly under the action of attraction force, and the magnets in the left half are mainly under the action of repulsion force, and then the rotor will swing around the X-axis.

As a preferred embodiment, since the first winding 21 needs to directly drive the first rotor 4 to rotate, the first winding 21 is closer to the first rotor 5 than the second winding 22, and the number of winding turns of the second winding 22 is set to be 1.5 to 2.5 times, preferably twice, that of the first winding 21 so that the second winding 22 can reliably control the first rotor 4. In addition, as a preferred embodiment, the second winding 21 is wound in two-phase six-stage form.

In order to better control the first rotor 4, a plurality of first sensing members 42 are further disposed on the rotor disc 40, and the plurality of first sensing members 42 are uniformly distributed on a circle centered at the center of the rotor disc 40 and surround the outer portion of the magnet 41, preferably near the outer edge of the rotor disc 40. The first sensing member 42 is smaller in size than the magnets 41 and is more numerous than the magnets 41. The magnetic levitation device applied to the artificial heart further includes a plurality of first sensors and a plurality of second sensors disposed on the first housing 10. The first sensor is mounted on the housing 1, and is arranged opposite to the first surface 403 of the first rotor 4, and can detect a distance between the first sensor and the first sensing member 42 passing below the first sensor, so as to sense a dynamic displacement change when the rotor rotates, and according to detection data of the plurality of first sensors, an axial position of the first rotor 4 and an inclination angle using an X axis and a Y axis as axes can be calculated, so that the first winding 21 and the second winding 22 can control the first rotor 4 to suspend and return to a normal state in a targeted manner. Preferably, the first sensors are eddy current displacement sensors, and the number of the first sensors is three, and the first sensors are uniformly distributed around the center of the rotor disc 40. The second sensor is used for detecting the position of the first sensing member 42 passing through, which is installed on the casing 1 and opposite to the outer circumferential surface of the rotor disc 40, and when the first sensing member 42 rotates through the second sensor, an induction signal can be generated, and the induction signal data obtained when the first rotor 4 rotates is passed through. The rotation speed and angle of the first rotor 4 can be calculated. Preferably, the number of the second sensors is also 3, and the second sensors are uniformly distributed on a circle centered at the center of the rotor disk 40. Preferably, the second sensor is a hall sensor.

As a preferred embodiment, referring to fig. 8, the first rotor 4 further includes a ring plate 43 covering the first sensing member 42, the ring plate 43 can protect the first sensing member 42, and has a surface with a higher flatness, so that the end surface of the first sensing member 42 below the ring plate is more flush, and the displacement measurement is more accurate.

As shown in fig. 5, a separate second sensing member 44 may be further provided to facilitate determination of the zero position (initial position) of the first rotor 4, the second sensing member 44 being located inside the loop formed by the plurality of first sensing members 42. In this embodiment, the number of the second sensing members 44 is two, and a connection line of the two second sensing members 44 passes through the center of the rotor disk 40.

In a preferred embodiment, the first sensing member 42 and/or the second sensing member 44 are made of a magnet.

The second winding 22 is arranged to keep the rotor to rotate vertically, so that the anti-torsion capability of the rotor is greatly improved, the rotor can be effectively prevented from inclining, the rotor can run more safely and reliably, and bad phenomena such as thrombus and crash are not easy to occur.

It can be understood that the first rotor 4 and the second rotor 5 are driven to rotate by the first stator 2 and the second stator 3, respectively, and therefore the rotation speeds of the first rotor 4 and the second rotor 5 may be the same or different, and the blood flow speed, pressure, flow rate, and the like outputted therefrom can be independently adjusted. In some cases, the first rotor 4 and the second rotor 5 need to be capable of synchronous movement, and in this case, as shown in fig. 9, a rotating shaft 6 may be connected between the two rotor disks 40 of the first rotor 4 and the second rotor 5, and the end of the rotating shaft 6 is connected to the center position of the rotor disks 40. The partition plate 12 is provided with a rotating shaft hole 120 matched and connected with the rotating shaft 6, and the rotating shaft 6 penetrates through the rotating shaft hole 120, so that the two rotors can reliably and synchronously move at the same rotating speed. In this embodiment, the two stators share a single rotor, and the gap in the cavity can be dynamically adjusted by using magnetic levitation, so that the dynamic balance of the left and right ventricular outputs can be conveniently achieved.

As a preferred embodiment, as shown in fig. 10, the ratio L/D of the height L of the stator teeth 20 to the stator outer diameter D is in the following range: 16/45< = L/D < =32/45, and in the ratio range, the stator of the magnetic suspension device applied to the artificial heart has better control efficiency on the rotor, and the control efficiency is deteriorated after the ratio is out of the range.

It should be noted that, although the structure of the two stators and the structure of the two rotors are the same in the present application, the two stators and the two rotors are not limited to be identical, for example, the heights L of the teeth 20 of the first stator 2 and the second stator 3 may be different, and the heights L of the teeth 20 can be adjusted according to the human body size, so as to achieve a rapidly changing and customized full ventricle assistance system design.

The application has at least the following advantages:

1. in the application, the impeller is positioned on the second surface of the rotor disc and is not positioned between the stator and the rotor, so that the distance between the stator and the rotor can be effectively shortened, and an air gap is reduced, thereby greatly reducing power loss and improving working efficiency; the impeller is integrated on the rotor disc, so that the overall size of the magnetic suspension device applied to the artificial heart can be reduced, and the magnetic suspension device is more convenient to implant into a human body;

2. in the application, the first winding and the second winding are wound on the stator, so that axial suspension can be actively realized by changing the current on the first winding, and the rotor can be driven to return to the right by the second winding, so that the anti-torsion capability of the rotor is greatly enhanced, the safety and the reliability of the magnetic suspension device applied to the artificial heart are higher, and the service life is longer;

3. in this application, be provided with flabellum portion and impeller on the rotor dish of rotor, blood can be accelerated by flabellum portion and impeller, and is specific, and flabellum portion can the axial blood flow with higher speed, and the impeller can radially accelerate the blood flow for can reduce the rotational speed of rotor when guaranteeing the blood velocity of flow, effectively alleviate the blood damage that high rotational speed brought, blood compatibility is better.

The above description is only for the purpose of illustrating embodiments of the present invention and is not intended to limit the scope of the present invention, and all modifications, equivalents, and equivalent structures or equivalent processes that can be used directly or indirectly in other related fields of technology shall be encompassed by the present invention.

Claims

1. A magnetic levitation apparatus for an artificial heart, comprising:

a housing (1) comprising an inner cavity and an inlet and an outlet communicating with the inner cavity;

a stator connected to the housing (1); and

a rotor movably disposed within the inner cavity, the rotor comprising a rotor disk (40), a plurality of magnets (41) disposed on the rotor disk (40), and an impeller coupled to the rotor disk (40); the rotor disc (40) comprising a first surface (403) arranged towards the stator and a second surface (404) arranged opposite the first surface (403), the impeller being connected to the second surface (404); the magnets (41) are uniformly distributed on a circle taking the center of the rotor disc (40) as the circle center, and the number of pole pairs of the magnets (41) is a multiple of 4;

wherein the stator further comprises: a tooth (20), a first winding (21) and a second winding (22) provided on the tooth (20); the first winding (21) is closer to the rotor than the second winding (22), and the number of turns of the second winding (22) is set to be 1.5 to 2.5 times the number of turns of the first winding (21); the first winding (21) is wound into a three-phase eight-level form, and the second winding (22) is wound into a two-phase six-level form; the ratio L/D of the length L of the tooth (20) to the outer diameter D of the stator is in the range: 16/45< = L/D < =32/45; the rotor comprises a first rotor and a second rotor, the stator comprises a first stator and a second stator, the first stator and the first rotor are correspondingly arranged, the second stator and the second rotor are correspondingly arranged, a rotating shaft is connected between two rotor disks of the first rotor and the second rotor, and the end part of the rotating shaft is connected to the center positions of the rotor disks.

2. Magnetic levitation device for artificial hearts according to claim 1, characterised in that it further comprises a plurality of first sensors connected to the casing (1) for detecting the distance between them and the rotor disc (40).

3. The magnetic levitation apparatus for artificial heart as recited in claim 1, wherein the first rotor (4) further comprises a plurality of first sensing members (42) disposed on the rotor disc (40), and the plurality of first sensing members (42) are uniformly distributed on a circle centered on the center of the rotor disc (40).

4. The magnetic levitation apparatus for an artificial heart as recited in claim 3, further comprising a plurality of second sensors attached to the housing (1), the second sensors being adapted to sense the first sensing member (42).

5. The magnetic levitation apparatus for an artificial heart as recited in claim 4, further comprising a second sensing member (44) connected to the rotor disk (40), wherein the zero position of the rotor is determined by the second sensing member (44) being sensed by the second sensor.

6. Magnetic levitation device for artificial hearts as in any of claims 1-5, whereby the housing (1) comprises one number of cavities; the number of the rotors is one, and the rotors are arranged in the inner cavity.

7. Magnetic levitation apparatus for an artificial heart as claimed in any one of claims 1 to 5, characterised in that the housing (1) comprises two cavities, respectively: a first lumen (100) and a second lumen (110) spaced from each other; the number of the rotors is two, the rotors are respectively arranged in the first inner cavity (100) and the second inner cavity (110), and each rotor is correspondingly provided with one stator.

8. The magnetic levitation apparatus applied to an artificial heart as recited in claim 7, wherein the inlet comprises a first inlet (101) communicating with the first inner chamber (100) and a second inlet (111) communicating with the second inner chamber (110), the outlet comprises a first outlet (102) communicating with the first inner chamber (100) and a second outlet (112) communicating with the second inner chamber (110), the axis of the first inlet (101) and the axis of the second inlet (111) are the same as the rotation axis of the rotor, and two stators are respectively sleeved on the first inlet (101) and the second inlet (111).

9. Magnetic levitation device for an artificial heart according to claim 7, wherein a partition (12) is arranged in the housing (1), the partition (12) dividing the inner chamber into the first inner chamber (100) and the second inner chamber (110).

10. Magnetic levitation device for an artificial heart according to claim 9, further comprising a rotating shaft (6) rotatably connected to the partition (12), the rotating shaft (6) being connected between the rotor discs (40) of the two rotors.