CN113082507B - Apply to artificial heart's magnetic suspension device - Google Patents

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

A magnetic levitation device applied to an artificial heart

technical field

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

Background technique

The artificial heart is used to supplement or replace the pumping function of the heart, and provides a new medical method for patients with cardiogenic shock and heart failure who were originally hopeless.

The artificial heart has roughly gone through three generations: the first generation of artificial heart uses a pulsating blood pump, which simulates the movement of the heart through the volume change of the pump cavity, outputs pulsating flow, and sends blood from the left ventricle to the aorta to achieve the effect of assisting the ventricle. However, the implantation of this generation of artificial hearts is highly invasive and has a high rate of mechanical failure, and its blood compatibility is low due to the influence of the mechanical structure.

The second-generation artificial heart adopts an axial-flow rotary blood pump with mechanical bearings. Through the rotation of the impeller, a steady flow is output, and blood is sent from the left ventricle to the aorta to assist the ventricle. The volume of this generation of artificial heart is greatly reduced. Allowing blood pumps to be implanted in the human chest, compared with the first-generation blood pumps that can only be implanted in the abdominal cavity, greatly reduces the patient's pain and improves the patient's quality of life. However, most of these blood pumps are still implanted in the abdominal cavity, and only a small part are implanted in the chest cavity. The implantation method is still highly invasive. When the blood pump is working, the blood soaks the bearing, and the high-speed rotating bearing causes blood damage, which reduces the blood compatibility of the whole device.

The third-generation artificial heart adopts a suspended rotary blood pump, which is divided into hydraulic suspension pump and magnetic suspension pump. Suspension under pressure, unable to suspend at low speeds, and blood compatibility is not as good as expected. Therefore, the magnetic levitation pump came into being. The rotor of the magnetic levitation pump has no contact with its surroundings, which can avoid the damage of blood caused by bearing friction. It has good blood compatibility and is small in size. It can be implanted in the chest cavity.

According to clinical data at home and abroad, up to 40% of patients develop right heart failure after left heart assistance, requiring double heart assistance. If two independent ventricular assist devices are used for dual-heart assist, it is easy to cause a flow mismatch between the systemic circulation and the pulmonary circulation, which may cause congestion problems in the lungs or vena cava. Therefore, a magnetically levitated artificial heart capable of double-heart assistance will be a better solution.

In the prior art, most of the artificial hearts capable of dual-heart assistance adopt magnetic levitation devices with a single stator and single rotor structure, and the impeller is located between the rotor and the stator, which has the following defects:

First of all, the structural form of the impeller between the rotor and the stator increases the air gap between the rotor and the stator, and the size of the air gap is related to the power efficiency. Under the condition of generating the same torque, the larger the air gap, the greater the power loss. Larger, lower efficiency;

Secondly, the rotor in the existing artificial heart is passively suspended by the force of the magnet and the magnet when it is suspended, and its anti-twisting ability is relatively weak. Adverse events such as thrombosis and shutdown occurred;

In addition, although the third-generation artificial heart eliminates the blood damage caused by bearing friction through the levitation system (magnetic levitation or/and hydraulic levitation), the blood lesion caused by the high speed has not been effectively controlled. This makes the blood compatibility poor. If the blood compatibility design is not good, the blood damage level of the maglev artificial heart may still be higher than that of the artificial heart using mechanical bearings.

Contents of the invention

In view of the deficiencies in the above technologies, the present application provides a magnetic levitation device applied to an artificial heart, which has lower power loss and higher work efficiency.

In order to solve the above technical problems, this application proposes a magnetic levitation device applied to an artificial heart, including:

a housing comprising a lumen and an inlet and an outlet communicating with the lumen;

a stator connected to the housing; and

The rotor is movably arranged in the inner cavity, and the rotor includes a rotor disk, a plurality of magnets arranged on the rotor disk, and an impeller connected with the rotor disk; the rotor disk includes a The first surface and the second surface opposite to the first surface, the impeller is connected to the second surface; a plurality of the magnets are evenly distributed on a circle centered on the center of the rotor disk, so The number of pole pairs of the magnet is a multiple of 4;

Wherein, the stator further includes: a tooth portion, a first winding and a second winding disposed on the tooth portion; the first winding is closer to the rotor than the second winding, and the first winding is closer to the rotor than the second winding. The number of turns of the second winding is set to be 1.5 to 2.5 times the number of turns of the first winding; the first winding is set in the form of three-phase eight-level winding, and the second winding is set in the form of two-phase six-level winding Form; the ratio L/D of the length L of the tooth portion to the outer diameter D of the stator is within the following range: 16/45<=L/D<=32/45.

Further, the magnetic levitation device applied to an artificial heart includes a plurality of first sensors connected to the casing, and the first sensors are used to detect the distance between the first sensor and the rotor disk.

Further, the first rotor further includes a plurality of first sensing elements arranged on the rotor disk, and the plurality of first sensing elements are evenly distributed on a circle centered on the center of the rotor disk .

Further, the magnetic levitation device applied to an artificial heart further includes a plurality of second sensors connected to the housing, and the second sensors are used to sense the first sensing element.

Further, the magnetic levitation device applied to an artificial heart further includes a second sensing element connected to the rotor disc, and the zero position of the rotor is determined by sensing the second sensing element through the second sensor .

Further, the housing includes one inner cavity; the rotor includes one rotor, which is arranged in the inner cavity.

Further, the housing includes two inner cavities, which are respectively: a first inner cavity and a second inner cavity separated from each other; the number of the rotors is two, which are respectively arranged in the first inner cavity and in the second inner cavity, and each of the rotors is correspondingly provided with one of the stators.

Further, the inlet includes a first inlet communicating with the first inner chamber and a second inlet communicating with the second inner chamber, and the outlet includes a first outlet communicating with the first inner chamber and a second inlet communicating with the second inner chamber. A second outlet communicating with the second inner chamber, 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. on the second inlet.

Further, a partition is provided in the housing, and the partition divides the inner chamber into the first inner chamber and the second inner chamber.

Further, the magnetic levitation device applied to an artificial heart further includes a rotating shaft rotatably connected to the separator, and the rotating shaft is connected between two rotor discs of the rotor.

Compared with the prior art, this application has the beneficial effect that: in this application, the impeller is located on the second surface of the rotor disc, which is not located between the stator and the rotor, which can effectively shorten the distance between the stator and the rotor and reduce the The small air gap greatly reduces power loss and improves work efficiency; and the impeller is integrated on the rotor disk, which can reduce the overall size of the magnetic levitation device used in the artificial heart, making it easier to implant into the human body. In addition, the stator is wound with a first winding and a second winding, which can actively realize axial levitation by changing the magnitude of the current on the first winding, and can also drive the rotor back to the center through the second winding, so that the rotor's ability to resist torsion is greatly enhanced. , so that the artificial heart is applied to the magnetic levitation device of the artificial heart with higher safety and reliability and longer service life.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort. in:

Fig. 1 is a top view of a magnetic levitation device used in an artificial heart in this application.

Fig. 2 is a sectional view of part A-A in Fig. 1 .

Fig. 3 is an exploded view of the magnetic levitation device used in the artificial heart in this application.

Fig. 4 is a schematic diagram of the first stator connected to the first housing in the present application.

Fig. 5 is a schematic structural diagram of the first rotor in the present application.

Fig. 6 is a structural schematic diagram of another viewing 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 cross-sectional view of the magnetic levitation device used in the artificial heart in this application, wherein a rotating shaft is connected between the two rotors.

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

Fig. 11 is a schematic diagram of the positions 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 another schematic diagram of the positions 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 above purpose, features and advantages of the present application more obvious and understandable, the specific implementation manners of the present application will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, for the convenience of description, only some structures related to the present application are shown in the drawings but not all structures. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

The terms "comprising" and "having" and any variations thereof in this application are intended to cover a non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes unlisted steps or units, or optionally further includes For other steps or units inherent in these processes, methods, products or apparatuses.

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 present application. The occurrences of this 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 understood explicitly and implicitly by those skilled in the art that the embodiments described herein can be combined with other embodiments.

As shown in Figures 1 to 10, a magnetic levitation device applied to an artificial heart corresponding to a preferred embodiment of the present application includes a casing 1 with an inner cavity, a stator connected to the casing 1, and a movable device arranged on the casing 1 the inner cavity of the rotor. The casing 1 is provided with an inlet and an outlet communicating with the inner cavity, and the stator is arranged correspondingly to the rotor, which can drive the rotor to suspend and rotate, thereby driving blood 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. For the magnetic levitation device of single ventricle auxiliary blood supply, the number of inner chambers included in the shell 1 is one, and the rotor The number is one, which is arranged in the inner cavity, and the rotor is correspondingly provided with a stator.

The magnetic levitation device in this embodiment has the function of biventricular auxiliary blood supply, as shown in Figure 2 and Figure 3, there are two inner cavities included in the shell 1, which are respectively the first inner cavity 100 and the second inner cavity 110; Two, respectively the first inlet 101 and the second inlet 111 ; there are also two outlets, respectively the first outlet 102 corresponding to the first inlet 101 and the second outlet 112 corresponding to the second inlet 111 .

Correspondingly, the magnetic levitation device applied to the artificial heart has two stators and two rotors. The two stators are respectively the first stator 2 and the second stator 3 located at both ends of the shell 1, and the two rotors are respectively the first rotor 4 and the second rotor 5, the first stator 2 is set corresponding to the first rotor 4, and the second The two stators 3 and the second rotor 5 are arranged correspondingly.

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

The first housing 10 and the second housing 11 have similar structures, and they 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 plate 12 can be compressed between the first housing 10 and the second housing 11 by means of compression.

The first rotor 4 is arranged in the first inner cavity 100, the first inlet 101 and the first outlet 102 are arranged on the first casing 10, and communicate with the first inner cavity 100, and the blood enters through the first inlet 101 and passes through the first A rotor 4 is then discharged from the first outlet 102 . Correspondingly, the second rotor 5 is arranged in the second inner chamber 110, the second inlet 111 and the second outlet 112 are arranged on the second casing 11 and communicate with the second inner chamber 110, and after the blood enters through the second inlet 111 After passing through the second rotor 5, it is discharged from the second outlet 112.

As a preferred embodiment, the first rotor 4 and the second rotor 5 are symmetrical to each other, such as mirror symmetry or central symmetry. On the one hand, the overall volume of the magnetic levitation device used in artificial hearts can be reduced; on the other hand On the one hand, the two stators are separated by two rotors at both ends of the shell 1, and the influence between them is small, and the influence between the stator and the rotor not driven by it is small, which is conducive to improving the magnetic levitation device applied to the artificial heart. work reliability.

In this embodiment, the rotation axes of the two rotors are the same, and the first inlet 101 and the second inlet 111 are substantially circular tubes and arranged coaxially with the rotation axes.

The two stators are located outside the first housing 10 and sleeved on the inlet. Wherein, the first stator 2 is sleeved on the first inlet 101 , and the second stator 3 is sleeved on the second inlet 111 . The connection mode between the stator and the housing 1 is not limited. For example, in this embodiment, the first housing 10 is provided with a plurality of positioning columns 104, and a pressure plate 105 is provided on the outside of the stator, and the bolts pass through the pressure plate 105 and are screwed to the positioning column 104. Press the stator onto the housing.

In this embodiment, the structures of the two stators (the first stator 2 and the second stator 3) are the same, and the structures of the two rotors (the second rotor 4 and the second rotor 5) are also the same, so the first stator 2 and the matched first rotor 4 as an example to introduce the technical solution of the present application.

As shown in FIGS. 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 , between two adjacent teeth 20 Stator slots are formed between them. The first winding 21 is used to drive the first rotor 4 corresponding to the first stator 2 to rotate, and to control the axial position of the first rotor 4 (the axial direction refers to the direction of its axis of rotation), so that the first rotor 4 Can be suspended in the first lumen 100 . As a preferred embodiment, the first winding 21 is wound in the form of three-phase eight-level, which can output a larger torque under the condition of ensuring the rotational speed.

A plurality of teeth 20 are evenly distributed on a circle centered on the axis of rotation. The number of teeth 20 is not limited. In order to enable it to be wound into a three-phase form, the number is a multiple of 3. As a preferred implementation In this embodiment, the number of teeth 20 is 12.

The first rotor 4 is arranged corresponding to the first stator 2, and it is driven to rotate by the first stator 2. After the first rotor 4 rotates, it will generate hydraulic pressure to suck blood from the first inlet 101 and draw blood from the first outlet 102. send out. Specifically, as shown in FIG. 5 , the first rotor 4 includes a rotor disk 40 and a plurality of magnets 41 installed on the rotor disk 40 . The magnets herein are all preferably magnets.

The rotor disk 40 is roughly in the shape of a flat cylinder, and its outer peripheral surface is adapted to the first inner cavity 100 and can rotate smoothly in the first inner cavity 100 . The magnet 41 is mounted on the first surface 403 of the rotor disk 40 facing the first stator 2 , and its N poles and S poles are alternately distributed to drive the first rotor 4 to rotate under the action of 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 number of pole pairs refers to the number of pairs of magnetic poles. Among the magnetic poles facing the stator, one N pole and one S pole To form a pair of magnetic poles, by setting the number of stator slots to be a multiple of 3 and the number of rotor pole pairs to be a multiple of 4, the least common multiple of the number of stator slots and the number of rotor pole pairs can be increased, and the stutter caused by large changes in reluctance can be avoided. The robustness of vibration and magnetic levitation is reduced due to rotational torque and torque chain wave, thereby improving blood compatibility and system life. In this embodiment, the number of magnets 41 is 8, and they are evenly distributed on a circle with the center of the rotor disk 40 as the center, and the corresponding number of pole pairs is 4.

As a preferred embodiment, the magnet 41 is in the shape of a flat plate, which can increase the relative area of the magnetic field between the stator and the rotor, increase the torque output, and then reduce the overall volume of the magnetic levitation device used in the artificial heart, and promote the application in the artificial heart. The miniaturization of the magnetic levitation device makes it easier to implant into the human body.

As shown in FIG. 4 , an annular groove 103 is opened at the corresponding position of the first housing 10 and the first stator 2 , and the tooth portion 20 of the first stator 2 extends into the annular groove 103 so that the tooth portion 20 and the magnet 41 The distance between them is closer, so that the first rotor 4 can be efficiently driven to rotate and power loss can be reduced.

As shown in FIG. 5 , a plurality of fan blades 401 radially distributed around the center of the rotor disk 40 are arranged on the rotor disk 40 . Specifically, a plurality of axial flow holes 400 are provided on the rotor disk 40 , and the plurality of axial flow holes 400 are evenly distributed on a circle with the center of the rotor disk 40 as the center. The axial flow hole 400 is an inclined axial flow hole, and its hole wall 4000 is arranged obliquely, and along any rotatable direction of the rotor disk 40, the inclination directions of the hole walls 4000 of all the axial flow holes 400 are consistent, so that adjacent The solid part between the two axial flow holes 400 forms the above-mentioned fan blade part 401 . After the rotor disc 40 rotates, the fan blades 401 will generate axial thrust to suck the blood at the first inlet 101 into the first inner cavity 100 , the principle of which is similar to that of an axial flow pump.

The number of axial flow holes 400 is not limited, and in this embodiment, the number is six. In addition, the shape of the axial flow hole 400 is not limited, and in this embodiment, its shape is roughly triangular. As a preferred implementation manner, the size of the axial flow hole 400 gradually increases from a position close to the center of the rotor disk 40 to the outside, so as to increase its flow-through area.

Further, as shown in FIGS. 6 and 7 , an impeller is provided on the second surface 404 of the rotor disk 40 facing the partition plate 12 , and the impeller includes a plurality of blades 402 , and the plurality of blades 402 are evenly distributed around the center of the rotor disk 40 , and the blade 402 does not point to the center of the circle, and forms a certain angle with the diameter of the rotor disk 40 to improve the centrifugal effect generated during rotation. The inner end 4020 of the blade 402 is close to the center of the rotor disk 40 and located on the blade portion 401 , and the outer end 4021 extends to the outer edge of the rotor disk 40 . In this way, the fluid channel formed between two adjacent blades 402 gradually expands from the inner end to the outer end. When the rotor disc 40 rotates at a high speed, the blood will be continuously thrown to the outer edge of the rotor disc 40 under the action of centrifugal force, thereby driving the blood The acceleration exits from the first outlet 102, the principle of which is similar to that of a centrifugal pump. Preferably, the axis of the outlet is substantially tangent to the lumen, so as to facilitate the flow of blood into the outlet.

By setting fan blades 401 and blades 402 on the first rotor 4, the first rotor 4 forms a two-stage impeller. When blood passes through the first rotor 4, it is first accelerated axially by the fan blades 401, and then by Radial acceleration of the blades 402 can generate a greater driving force to drive the blood to accelerate through the first inner cavity 100, thereby reducing the rotational speed of the first rotor 4 while ensuring the blood supply, effectively reducing the risk caused by high-speed rotation. The resulting blood damage is beneficial to improve blood compatibility. In addition, the fan blade part 401 and the blade 402 can be integrally formed on the rotor disk, which has better strength and rigidity.

In addition, it can be understood that, in the present application, the fan blade part 401 and the blade 402 are integrated on the rotor disk 40 , and there is no need to arrange an impeller between the first stator 2 and the first rotor 4 . In this way, there is no obstruction of the impeller on the magnetic path between the first stator 2 and the first rotor 4, which can effectively shorten the distance between the first stator 2 and the first rotor 4, reduce the air gap, and thus greatly reduce the The power loss is reduced, and the work efficiency is improved; and the overall size of the magnetic levitation device used in the artificial heart is also reduced, making it easier to implant into the human body.

As shown in FIG. 5 , in FIG. 5 , the Z-axis is the rotation axis of the first rotor 4 , and the X-axis, Y-axis and Z-axis are perpendicular to each other, forming a spatial rectangular coordinate system. During the rotation of the first rotor 4 , since there is a gap between it and the first inner cavity 100 , it may tilt around the X-axis or the Y-axis to wobble. In order to improve the anti-twisting ability, as shown in Fig. 2 and Fig. 4, in this embodiment, a second winding 22 is wound on the tooth part 20, which can control the torsion of the first rotor 4 through magnetic force, thereby maintaining the first rotor 4 For example, when the first rotor 4 is tilted around the X-axis or the Y-axis, it can adjust the magnitude of its attraction/repulsion to the magnets 41 at different positions by controlling the magnitude of the current in different phases of the second winding 22, thereby Drive the first rotor 4 back upright; for another example, it can control the current frequency of the second winding 22 to change the polarity of the part corresponding to the magnet 41, so that the state of attraction or repulsion to the magnet 41 can be changed, thereby driving the first rotor 4 Return to the upright state, specifically, as shown in Figure 11 and Figure 12, the figure shows a schematic diagram of the positions of the magnetic poles formed by the second winding 22 of the two-phase six-stage and the eight magnetic poles formed by the eight magnets 41 on the rotor, In the figure, the labels representing the magnetic poles of the magnet 41 are N1-N4 and S1-S4, and the labels representing the magnetic poles of the second winding 22 are n1-n3 and s1-s3. Obviously, when the rotor and the second winding 22 are located In the relative position shown in the figure, the magnets in the upper half of the Y axis in the figure are mainly affected by repulsion, while the magnets in the lower half are mainly affected by suction. At this time, the rotor will swing around the Y axis; when the rotor is in contact with the first When the two windings 22 are located at the relative positions shown in Figure 12, the magnets on the right half of the X-axis in the figure are mainly subject to the attraction force, while the magnets on the left half are mainly subject to the repulsion force. At this time, the rotor will revolve around the X-axis swing.

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 at the same time, in order to enable the second winding 22 to To reliably control the first rotor 4, the number of turns of its winding is set to be 1.5-2.5 times, preferably twice, that of the first winding 21 . In addition, as a preferred implementation manner, the second winding 21 is wound in the form of two phases and six levels.

In order to better control the first rotor 4 , a plurality of first sensing elements 42 are also arranged on the rotor disk 40 , and the plurality of first sensing elements 42 are evenly distributed on a circle centered on the center of the rotor disk 40 , and surround the outside of the magnet 41 , preferably near the outer edge of the rotor disk 40 . The size of the first sensing element 42 is smaller than that of the magnet 41 , and its quantity is more than that of the magnet 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 casing 10 . Wherein, the first sensor is installed on the shell 1, and is arranged opposite to the first surface 403 of the first rotor 4, which can detect the distance between it and the first sensing member 42 passing under it, thereby sensing the rotor The dynamic displacement changes during rotation. According to the detection data of multiple first sensors, the axial position of the first rotor 4 and the inclination angle with the X axis and the Y axis as axes can be calculated, so that the first winding 21 and the second The winding 22 can control the levitation and return of the first rotor 4 in a targeted manner. Preferably, the first sensor is an eddy current displacement sensor, and the number is three, which are evenly distributed with the center of the rotor disk 40 as the center. The second sensor is used to detect the passing first sensing element 42, which is installed on the casing 1 and is opposite to the outer peripheral surface of the rotor disk 40. When the first sensing element 42 rotates past the second sensor, a The induction signal is the induction signal data obtained when the first rotor 4 rotates. The rotational speed and angle of the first rotor 4 can be calculated. Preferably, the number of the second sensors is also three, which are evenly distributed on a circle with the center of the rotor disk 40 as the center. 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 element 42, the ring plate 43 can protect the first sensing element 42, and it has flatness The higher surface makes the end surface of the first sensing element 42 below it more flush, and the displacement measurement is more accurate.

As shown in Fig. 5, an independent second sensing element 44 can also be set to conveniently determine the zero position (initial position) of the first rotor 4, and the second sensing element 44 is located at the position formed by a plurality of first sensing elements 42. inside of the ring. In this embodiment, the number of the second sensing elements 44 is two, and the line connecting the two second sensing elements 44 passes through the center of the rotor disk 40 .

As a preferred implementation manner, the first sensing part 42 and/or the second sensing part 44 are made of magnets.

By setting the second winding 22 to maintain the upright rotation of the rotor, the anti-twisting ability of the rotor is greatly improved, and the rotor can be effectively prevented from tilting, so that the operation of the rotor is safer and more reliable, and less prone to adverse phenomena such as thrombus and crash.

It can be understood that the above-mentioned first rotor 4 and second rotor 5 are independently driven to rotate by the first stator 2 and the second stator 3 respectively, therefore, the rotational speeds of the first rotor 4 and the second rotor 5 can be the same or different , the output blood flow velocity, pressure and flow can be adjusted independently. In some cases, the first rotor 4 and the second rotor 5 need to be able to move synchronously. At this time, as shown in FIG. 6. The end of the rotating shaft 6 is connected to the center of the rotor disk 40 . The partition 12 is provided with a rotating shaft hole 120 matched with the rotating shaft 6, and the rotating shaft 6 passes through the rotating shaft hole 120, which can reliably ensure that the two rotors move synchronously at the same speed. In this embodiment, it is equivalent to two stators sharing a single rotor, and the gap in the cavity can be dynamically adjusted by using magnetic suspension, so as to conveniently achieve a dynamic balance between the output of the left and right ventricles.

As a preferred embodiment, as shown in FIG. 10 , the ratio L/D of the height L of the stator teeth 20 to the outer diameter D of the stator is in the following range: 16/45<=L/D<=32/45, Within the range of the ratio, the stator of the magnetic levitation device used in the artificial heart has better control efficiency to the rotor, and beyond the range, the control efficiency will be worse.

It should be pointed out that although the structures of the two stators and the two rotors in the present application are the same, they are not limited to the same form, for example, the teeth 20 of the first stator 2 and the second stator 3 The height L can be different, and the height L of the tooth portion 20 can be adjusted correspondingly according to the body shape of a person, so as to achieve a rapidly changing and customized design of the whole ventricular assist system.

This application has at least the following advantages:

1. In this application, the impeller is located on the second surface of the rotor disc, which is not located between the stator and the rotor, which can effectively shorten the distance between the stator and the rotor and reduce the air gap, thereby greatly reducing power loss and improving The work efficiency is improved; and the impeller is integrated on the rotor disk, which can reduce the overall size of the magnetic levitation device applied to the artificial heart and make it easier to implant into the human body;

2. In this application, the stator is wound with a first winding and a second winding, which can actively realize axial levitation by changing the magnitude of the current on the first winding, and can also drive the rotor back to normal through the second winding, so that the resistance of the rotor The torsion ability is greatly enhanced, which makes the magnetic levitation device used in the artificial heart more safe and reliable, and has a longer service life;

3. In this application, the rotor disc of the rotor is provided with fan blades and impellers, and the blood can be accelerated by the fan blades and the impeller. Specifically, the fan blades can accelerate blood flow in the axial direction, and the impeller can accelerate blood flow in the radial direction , so that the rotation speed of the rotor can be reduced while ensuring the blood flow rate, effectively reducing the blood damage caused by the high rotation speed, and the blood compatibility is better.

The above is only the implementation of the application, and does not limit the patent scope of the application. Any equivalent structure or equivalent process conversion made by using the specification and drawings of the application, or directly or indirectly used in other related technologies fields, are all included in the scope of patent protection of this application in the same way.

Claims (10)

1. A magnetic levitation device applied to an artificial heart, characterized in that it comprises: a housing (1) comprising a lumen and an inlet and an outlet communicating with said lumen; a stator connected to said casing (1); and The rotor is movably arranged in the inner cavity, and the rotor includes a rotor disk (40), a plurality of magnets (41) arranged on the rotor disk (40), and an impeller connected to the rotor disk (40) ; the rotor disc (40) includes a first surface (403) facing the stator and a second surface (404) opposite to the first surface (403), the impeller is connected to the second On the surface (404); a plurality of magnets (41) are evenly distributed on a circle with the center of the rotor disk (40) as the center, and the number of pole pairs of the magnets (41) is a multiple of 4; Wherein, the stator further comprises: a tooth portion (20), a first winding (21) and a second winding (22) arranged on the tooth portion (20); the first winding (21) is compared to The second winding (22) is closer to the rotor, 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 The winding (21) is wound in the form of three-phase eight-level, and the second winding (22) is wound in the form of two-phase six-level; the length L of the tooth portion (20) is in relation to the outer diameter D of the stator The ratio L/D is located in the following range: 16/45<=L/D<=32/45; the rotor includes a first rotor and a second rotor, and the stator includes a first stator and a second stator, the first A stator is arranged correspondingly to the first rotor, a second stator is arranged correspondingly to the second rotor, a rotating shaft is connected between the two rotor disks of the first rotor and the second rotor, and the end of the rotating shaft is connected to the center of the rotor disk. 2. the magnetic levitation device applied to artificial heart as claimed in claim 1, is characterized in that, it also comprises a plurality of the first sensor that is connected on the described housing (1), and described first sensor is used for detecting its and The distance between the rotor disks (40). 3. The magnetic levitation device applied to an artificial heart according to claim 1, characterized in that, the first rotor (4) further comprises a plurality of first sensing elements ( 42), a plurality of the first sensing elements (42) are evenly distributed on a circle centered on the center of the rotor disk (40). 4. The magnetic levitation device applied to an artificial heart as claimed in claim 3, characterized in that, it also includes a plurality of second sensors connected to the housing (1), and the second sensors are used to sense the The first sensing element (42). 5. The magnetic levitation device applied to an artificial heart as claimed in claim 4, further comprising a second sensor (44) connected to the rotor disk (40), through which the second sensor Sensing the second sensing element (44) determines the zero position of the rotor. 6. The magnetic levitation device applied to an artificial heart according to any one of claims 1 to 5, characterized in that, the housing (1) includes one cavity; the rotor has one rotor, which is arranged at in the lumen. 7. The magnetic levitation device applied to an artificial heart according to any one of claims 1 to 5, characterized in that, the housing (1) includes two inner cavities, which are respectively: a first chamber spaced apart from each other. inner chamber (100) and second inner chamber (110); the number of the rotors is two, which are respectively arranged in the first inner chamber (100) and the second inner chamber (110), and each The rotor is correspondingly provided with one stator. 8. The magnetic levitation device applied to an artificial heart according to claim 7, characterized in that, the inlet includes a first inlet (101) communicating with the first inner chamber (100) and a first inlet (101) communicating with the second inner cavity A second inlet (111) communicated with the chamber (110), the outlet includes a first outlet (102) communicated with the first inner chamber (100) and a second outlet communicated with the second inner chamber (110). The outlet (112), the axes of the first inlet (101) and the second inlet (111) are the same as the rotation axis of the rotor, and the two stators are respectively sleeved on the first inlet (101) And on the second inlet (111). 9. The magnetic levitation device applied to an artificial heart as claimed in claim 7, characterized in that, a partition (12) is arranged in the housing (1), and the partition (12) divides the inner cavity into The first lumen (100) and the second lumen (110). 10. The magnetic levitation device applied to an artificial heart as claimed in claim 9, characterized in that, it also comprises a rotating shaft (6) rotatably connected to the partition (12), and the rotating shaft (6) is connected to Between the rotor disks (40) of the two said rotors.

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