JP7123059B2 - pumping equipment - Google Patents

Description

The present invention relates to a pump device for causing fluid to flow.

A pump device is used as a blood circulation device for causing blood (fluid) to flow in a heart-lung machine. For example, a pump device disclosed in Japanese Patent Application Laid-Open No. 2013-212218 rotates an impeller within a housing, and the centrifugal force generated by this rotation draws blood into the housing and discharges the blood from the housing.

In particular, the pump device described in Japanese Patent Application Laid-Open No. 2013-212218 includes dynamic pressure grooves (radial dynamic pressure bearings) that suppress tilting of the impeller during rotation of the impeller. The dynamic pressure grooves rotate the impeller relative to the housing without contact by using the dynamic pressure generated when the fluid flows. This reduces the occurrence of thrombus and hemolysis.

However, in the configuration in which the dynamic pressure generating grooves are provided in the impeller or the fixed shaft as in Japanese Patent Application Laid-Open No. 2013-212218, the process of forming the dynamic pressure generating grooves (cutting, etc.) is time-consuming and costly. In addition, when the impeller rotates slowly, the function of the hydrodynamic bearing is not sufficiently exhibited, and the impeller may come into contact with the fixed shaft.

The present invention has been made in view of the above circumstances, and provides a pump device that suppresses the impeller from being displaced in the radial direction and coming into contact with the housing during rotation of the impeller, and that rotates the impeller stably. intended to provide

In order to achieve the above object, the pump device of the present invention comprises a housing in which a first repulsion magnet is arranged in an annular shape, and an impeller which is rotatably accommodated in the housing and in which a second repulsion magnet is arranged in an annular shape. a motor mechanism that is built in the housing and rotates a drive magnet; and a driven magnet that is arranged in the impeller and rotates the impeller as the drive magnet rotates , wherein the first repulsion magnet and the The second repelling magnets are arranged along the radial direction orthogonal to the rotation axis of the impeller, and have the same polarity on the facing surfaces facing each other . It is characterized by being positioned at the same height and spaced radially from the driven magnet .

According to the above, in the pump device, a repulsive force acts between the opposing surface of the first repulsive magnet and the opposing surface of the second repulsive magnet. As a result, the impeller having the second repulsion magnet is prevented from coming into contact with the first repulsion magnet (that is, the housing), and can rotate stably, allowing the fluid to flow smoothly. For example, when the fluid is blood, the occurrence of thrombus and hemolysis can be greatly suppressed.

At least one of the first repulsion magnet and the second repulsion magnet is magnetized with the first polarity over the entire circumference of the outer peripheral portion, and has a polarity opposite to the first polarity over the entire circumference of the inner peripheral portion. It is preferable that the ring body is magnetized to the second polarity.

Since the pump device is a ring body magnetized with the first polarity and the second polarity on the outer and inner circumferences, respectively, the repulsive force is generated more evenly around the rotation axis of the impeller. This further increases the rotational stability of the impeller.

Further, the housing may include a motor mechanism that rotates a drive magnet, and the impeller may have a driven magnet that rotates the impeller as the drive magnet rotates.

Thereby, the pump device can transmit the rotational force of the drive magnet to the driven magnet of the impeller without contact. Therefore, it is possible to make the fluid flow space independent of the motor mechanism, and to suppress radial vibration by the first and second repulsion magnets.

In addition to the above configuration, it is preferable that the repulsive force between the first repulsive magnet and the second repulsive magnet is greater than the magnetic coupling force of a magnetic coupling mechanism composed of the drive magnet and the driven magnet. .

When the impeller rotates, even if a large magnetic coupling force acts at a certain circumferential position, the impeller and the housing are kept in a non-contact state because the repulsive forces of the first repulsive magnet and the second repulsive magnet are large. You can continue with more certainty.

Further, the repulsive force is preferably greater than the sum of the magnetic coupling force when the impeller comes closer to the housing than a predetermined distance and the fluid force applied to the impeller by the fluid flowing into the housing.

When the impeller approaches the housing more than a predetermined distance, the pump device exerts a repulsive force greater than the sum of the magnetic coupling force and the fluid force, thereby more reliably maintaining the non-contact state between the impeller and the housing. can be done.

Further, it is preferable that a repulsion mechanism composed of the first repulsion magnet and the second repulsion magnet be provided inside the magnetic coupling mechanism.

As a result, the pump device exerts a repulsive force on the impeller from the inside to the outside in the radial direction, thereby stably rotating the impeller.

Further, a first gap between the housing in which the first repulsion magnets constituting the repulsion mechanism are arranged and the impeller is a first gap between the housing in which the drive magnets constituting the magnetic coupling mechanism are arranged and the impeller. It is preferably narrower than the second gap between the impeller.

In the pump device, since the first gap is narrower than the second gap, the repulsive force can be easily transmitted from the first repulsive magnet to the second repulsive magnet, and the bearing in the radial direction can be firmly formed. .

In addition to the above configuration, the housing has a central portion arranged radially inward of the impeller and a peripheral portion arranged radially outward of the impeller. Preferably, one repelling magnet is fixed, while the driving magnet is rotatably arranged inside the perimeter.

In the pump device, the first repulsion magnet is fixed inside the central portion of the housing, and the driving magnet is rotatably arranged inside the peripheral portion of the housing, so that the repulsion mechanism can be easily arranged radially inward of the impeller. can be provided.

Furthermore, the housing may include a first housing having the impeller and a second housing having the motor mechanism, and the first housing and the second housing may be configured to be detachable.

By making the first housing and the second housing detachable, the pump device can reuse the motor mechanism and the second housing while discarding the impeller and the first housing after use.

Further, it is preferable that the axial length of the first repulsion magnet parallel to the rotation axis is longer than the axial length of the second repulsion magnet parallel to the rotation axis.

Since the axial length of the first repulsion magnet is longer than the axial length of the second repulsion magnet, the pump device is designed so that even if the impeller is displaced in the rotation axis direction, the first repulsion magnet and the second repulsion magnet are opposed to each other. Good condition can be maintained. In other words, the repulsive force can be exhibited continuously.

The housing preferably has a hydrodynamic bearing at a location facing the impeller in the direction along the rotation axis.

Since the pump device has the dynamic pressure bearing, the impeller can be prevented from contacting the housing in the axial direction, and the impeller can be rotated more stably.

ADVANTAGE OF THE INVENTION According to this invention, a pump apparatus can suppress that an impeller displaces to a radial direction and contacts a housing|casing during rotation of an impeller, and can rotate an impeller stably.

1 is a perspective view of a pump device according to an embodiment of the invention; FIG. FIG. 2 is a side cross-sectional view showing a state in which the pump body and the driving device in FIG. 1 are separated; It is a side sectional view showing the principal part of a pump device. FIG. 4 is a sectional view taken along line IV-IV showing a driven magnet, a movable-side repulsion magnet, a drive magnet, and a fixed-side repulsion magnet in FIG. 3; It is a side sectional view showing the important section of the pump device concerning the 1st modification. FIG. 11 is a cross-sectional view showing a driven magnet, a movable-side repulsion magnet, a drive magnet, and a fixed-side repulsion magnet of a pump device according to a second modified example;

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of a pump device according to the present invention will now be described in detail with reference to the accompanying drawings.

The pump device 10 according to one embodiment of the present invention is a heart-lung machine 12 that assists the patient's cardiopulmonary function (or replaces the heart-lung machine), and is a power source that removes the patient's blood from the body and pumps it into the body. Used as a source. As shown in FIG. 1, the pump device 10 is configured as a centrifugal pump that has an impeller 14 therein and causes a fluid to flow by centrifugal force accompanying rotation of the impeller 14 .

The heart-lung machine 12 connects a blood removal tube 18 and a blood transfer tube 20 to the pump device 10 to form a circulation circuit for circulating blood between the patient and the patient. The blood removal tube 18 has a blood removal lumen 18a inside, and its tip opening is left in a desired living organ (for example, the left ventricle of the heart) to suck the patient's blood through the blood removal lumen 18a. The blood supply tube 20 has a blood supply lumen 20a inside, and its tip opening is left in a desired living organ (for example, subclavian artery), and the blood of the pump device 10 is supplied through the blood supply lumen 20a. . The heart-lung machine 12 may have a configuration in which a reservoir, an oxygenator, etc. (both not shown) are connected in the middle of the circulation circuit (blood removal tube 18 and blood delivery tube 20) in addition to the pump device 10. FIG. As a result, the artificial heart-lung machine 12 can remove foreign substances from the blood that has been removed from the body, oxygenate the blood, and return the blood to the patient's body.

As shown in FIG. 2, the pump device 10 according to the present embodiment includes a pump main body 22 housing the impeller 14, a driving device 24 for rotating the impeller 14, and a driving device 24 for controlling the driving of the driving device 24. and a control unit 26 . Further, the housing 30 of the pump device 10 has a body-side housing 32 (first housing) that forms the pump body 22 and a drive-side housing 60 (second housing) that forms the drive device 24 .

The housing 30 includes a body-side housing 32 and a driving-side housing 60 that can be detachably attached to each other, and can be assembled together when used, so that the driving force of the driving device 24 can be transmitted to the impeller 14 . After use, the pump body 22 is removed from the drive device 24 and discarded. In other words, the pump body 22 is configured as a disposable type that is replaced after each use and is disposable or sterilized. On the other hand, the driving device 24 is configured as a reuse type, and a new pump body 22 is attached to operate the impeller 14 of this pump body 22 at the next occasion of use.

A body-side housing 32 of the pump body 22 is formed to have an external appearance that can be attached to the driving device 24 . Inside the body-side housing 32, an internal space 36 is provided in which the impeller 14 is rotatably accommodated and blood is introduced and discharged.

The body-side housing 32 has a substantially conical upper housing portion 33 and a cylindrical lower housing portion 34 connected to the lower portion of the upper housing portion 33 and attached to the driving device 24 . An internal space 36 is formed across both the upper housing portion 33 and the lower housing portion 34 . The upper housing portion 33 and the lower housing portion 34 are configured to be mutually separable so that the impeller 14 can be taken out.

The upper housing part 33 has a blood inlet port 38 connected to the blood removal tube 18 and a blood outlet port 40 connected to the blood transfer tube 20 . The blood inflow port 38 is provided in the ceiling portion and the center of the upper housing portion 33 and protrudes upward. 38a is provided. The blood outflow port 40 protrudes tangentially from the side of the upper space 36a, and an outflow path 40a communicating with the upper space 36a is provided therein.

The upper space 36a is shaped according to the outer shape of the upper housing portion 33 and is formed to have a predetermined volume. A fin portion 46 on the upper side of the impeller 14 is arranged in the upper space 36a. A ceiling-side dynamic pressure bearing 41 (dynamic pressure bearing in the thrust direction) that rotates the impeller 14 in a non-contact manner when the impeller 14 rotates is provided in the ceiling portion that covers the upper space 36a. For example, the ceiling side dynamic pressure bearing 41 can apply a groove of a predetermined shape obtained by shallowly notching the ceiling portion.

At the center of the bottom wall of the walls surrounding the upper space 36a, the central upper part of the lower housing part 34 is arranged. It's becoming The chevron portion 35a is curved in an arcuate shape in side cross-sectional view, and allows the blood to flow smoothly through the circulation holes 50 of the fin portion 46. As shown in FIG.

The lower housing portion 34 protrudes downward from the upper housing portion 33 and is formed in a cylindrical shape having an axis coaxial with the center of the upper space 36a. A shaft tube portion 35 that supports the impeller 14 is provided at the center of the lower housing portion 34 . The axial tube portion 35 is composed of the above-described chevron portion 35a and an inner peripheral portion 35b that continues from the rim of the chevron portion 35a to the lower side, and an insertion hole 42 that is open at the lower end is provided inside. .

A lower space 36b (part of the internal space 36) communicating with the upper space 36a is formed inside the lower housing portion 34. As shown in FIG. The lower space 36b surrounds the side of the insertion hole 42 according to the cylindrical shape of the lower housing portion 34, and accommodates the driven rotation structure portion 48 of the impeller 14 so as to rotate freely.

A bottom-side dynamic pressure bearing 43 (dynamic pressure bearing in the thrust direction) that rotates the impeller 14 in a non-contact manner is provided at the bottom that constitutes the lower space 36b. As with the ceiling-side dynamic pressure bearing 41, the bottom-side dynamic pressure bearing 43 may also employ a groove having a predetermined shape in which the bottom is notched shallowly. The groove shapes of the ceiling-side dynamic pressure bearing 41 and the bottom-side dynamic pressure bearing 43 may be the same or different.

As shown in FIGS. 1 to 3, the impeller 14 is formed in a cylindrical shape having a through hole 15 inside. The impeller 14 is housed in the body-side housing 32 by inserting the shaft tube portion 35 of the lower housing portion 34 into the through hole 15 . The through hole 15 creates a slight first gap 37a between the inner peripheral surface of the impeller 14 and the outer peripheral surface of the shaft tube portion 35 in the accommodated state. The interval of the first gap 37a depends on the size of the pump body 22, but is set in the range of, for example, 0.1 mm to 1 mm.

Also, the impeller 14 is housed over both the upper space 36a and the lower space 36b. A fin portion 46 is provided on the upper portion of the impeller 14 , and a driven rotation structure portion 48 is provided on the lower portion of the impeller 14 . Note that the impeller 14 in FIG. 2 has a configuration in which the fin portion 46 and the driven rotation structure portion 48 formed as separate members are fixed to each other. The part 48 may be integrally molded.

The fin portion 46 is arranged in the upper space 36a and applies centrifugal force to the blood as it rotates. The fin portion 46 has a communication hole 50 that communicates the through hole 15 with the radially outer side of the fin portion 46 . The communication hole 50 is surrounded by an upper shroud 50 a , a plurality of side wall portions 50 b that extend downward from the shroud 50 a , and an upper surface 48 a of the driven rotation structure 48 .

The shroud 50a is the roof of the flow hole 50 that rotates without contact with the ceiling portion by the ceiling-side dynamic pressure bearing 41, and extends radially outward and downward according to the shape of the ceiling portion of the upper housing portion 33. Inclined. The upper surface 48a is also slanted so as to be substantially parallel to the shroud 50a.

The plurality of side wall portions 50b are designed to have an inclined or curved shape that produces an appropriate centrifugal force according to the rotation state (rotation direction, rotation speed, etc.) of the impeller 14 . The shape of the fin portion 46 is not limited to the above. For example, the shroud 50a may not be provided and a plurality of feather-like walls (side wall portions 50b) may protrude from the upper surface 48a.

The driven rotation structure 48 is formed in a cylindrical shape having a predetermined thickness in the radial direction of the impeller 14, and as shown in FIGS. A rotational force is transmitted and it rotates. A driven magnet 54 and a movable-side repulsion magnet 56 (second repulsion magnet) are installed inside (inside) the driven rotation structure 48 . Further, a closing portion 58 that closes the cavity after the driven magnet 54 and the movable-side repelling magnet 56 are accommodated is provided at the lower portion of the driven rotation structure portion 48 .

The driven magnet 54 is positioned at the same height as the driving magnet 64 of the driving device 24 when the pump main body 22 and the driving device 24 are attached, and forms a magnetic coupling mechanism 76 with the driving magnet 64 . As shown in FIG. 4, the driven magnet 54 according to the present embodiment is configured as a driven side multipolar magnetized ring magnet 55 that rotates around the rotation axis O of the impeller 14 at a constant radius. The axial length (the thickness of the driven magnet 54 ) of the multipolar magnetized ring magnet 55 on the driven side parallel to the rotation axis O is designed to be approximately the same as the axial length of the drive magnet 64 .

The driven side multi-pole magnetized ring magnet 55 is magnetized so that a plurality of N poles and S poles are alternately arranged along the circumferential direction. In FIG. 4, the number of polarities of the driven-side multipolar magnetized ring magnet 55 is set to six (that is, three opposite poles), but it is not limited to this. Examples of the material forming the driven magnet 54 (driven side multipolar magnetized ring magnet 55) include hard magnetic materials such as alnico, ferrite, and neodymium.

On the other hand, as shown in FIGS. 2 and 3, the movable-side repelling magnet 56 is positioned at the same height as the driven magnet 54 (driven-side multi-pole magnetized ring magnet 55) and spaced radially inward of the driven magnet 54. placed open. This movable side repulsion magnet 56 is arranged so as to be adjacent to a fixed side repulsion magnet 66 described later in the radial direction (direction orthogonal to the rotation axis O) in the mounted state of the pump main body 22 and the driving device 24, and mutually A repulsion mechanism 78 that repels each other is formed. A partition wall 59 is interposed between the driven magnet 54 and the movable-side repelling magnet 56 . The partition wall 59 may be made of, for example, a material that blocks magnetic force.

As shown in FIG. 4, the movable-side repelling magnet 56 according to the present embodiment is composed of a movable-side inner/outer single-pole magnetized ring magnet 57 that circulates at a position spaced apart from the rotation axis O by a predetermined distance. The movable-side inner and outer single-pole magnetized ring magnet 57 has a first polarity (N pole in FIG. 4) over the entire circumference of the outer circumference, and a second polarity opposite to the first polarity over the entire circumference of the inner circumference. It is a ring body magnetized so as to have an (S pole in FIG. 4). That is, the inner circumferential surface of the movable-side repulsion magnet 56 is a movable-side repulsion surface 56a on which the first polarity always exists along the circumferential direction. The material constituting the movable-side repelling magnet 56 (the movable-side inner and outer single-pole magnetized ring magnets 57) is not particularly limited, and the materials listed for the driven magnet 54 can be applied.

As shown in FIGS. 2 and 3, the closing portion 58 constitutes the lower end surface of the driven rotation structure 48 and has the function of holding the driven magnet 54 and the movable-side repulsion magnet 56 . The closing portion 58 faces the bottom side dynamic pressure bearing 43 and rotates without contacting the bottom portion when the impeller 14 rotates.

Further, the impeller 14 is configured to have a second gap 37b at a predetermined distance from the outer peripheral portion 34a that surrounds the outside of the lower housing portion 34. As shown in FIG. This second gap 37b is larger than the first gap 37a. This allows the impeller 14 to rotate more smoothly.

The drive device 24 of the pump device 10 includes a drive-side housing 60 and a motor mechanism 62 housed within the drive-side housing 60 . Further, the drive device 24 includes a drive magnet 64 provided in the motor mechanism 62 that attracts the impeller 14 and a fixed side repulsion magnet 66 (second magnet) that is provided in the drive-side housing 60 and repels the impeller 14 . 1 repelling magnet).

The drive-side housing 60 is composed of an upper housing 61a having a cylindrical mounting groove 68 for mounting the pump body 22 on its upper surface, and a lower housing 61b connected to the lower side of the upper housing 61a. . Further, a radially inner portion of the mounting groove 68 of the driving side housing 60 is a central protrusion 60 a (central portion) that is inserted into the insertion hole 42 of the lower housing portion 34 . A radially outer portion of the mounting groove 68 of the drive-side housing 60 forms an annular peripheral convex portion 60b (peripheral portion) slightly lower than the central convex portion 60a.

The body-side housing 32 of the pump body 22 and the drive-side housing 60 of the drive device 24 have an engagement structure 44 that can be detachably positioned and fixed to each other. In the present embodiment, the engaging structure 44 inserts the lower housing portion 34 into the mounting groove 68 and engages the central convex portion 60a and the peripheral convex portion 60b. Of course, the engaging structure 44 may employ various configurations.

A motor main body 70 of the motor mechanism 62 is provided inside the lower housing 61b, and the motor main body 70 rotates the shaft portion 72 at an appropriate rotational speed under the control of the control portion 26. FIG. The shaft portion 72 is inserted into the upper housing 61a from the lower housing 61b, and the rotating body 74 is mounted in the upper housing 61a. When the pump main body 22 and the drive device 24 are mounted, the rotation axis O of the impeller 14 and the axis (rotation axis O) of the shaft portion 72 overlap each other.

In a side cross-sectional view, the rotating body 74 includes a mounted portion 74a mounted on the shaft portion 72, a disk portion 74b extending radially outward from the mounted portion 74a, and an upward direction (rotating shaft and a holding protrusion 74c protruding in the direction parallel to O). A driving magnet 64 is attached to the projecting end (upper end) of the holding protrusion 74c. In other words, the rotating body 74 arranges the driving magnet 64 at a predetermined radial position and height position (inside the peripheral convex portion 60b) within the driving side housing 60, and rotates the driving magnet 64 as the shaft portion 72 rotates. to rotate.

As shown in FIG. 4, the drive magnet 64 according to the present embodiment is configured as a drive-side multipolar magnetized ring magnet 65 that circulates with a radius longer than that of the driven magnet 54 with respect to the rotation axis O of the shaft portion 72. . Like the driven magnet 54, the drive-side multipolar magnetized ring magnet 65 is magnetized so that a plurality of (six) polarities (N pole, S pole) are alternately arranged along the circumferential direction. The material for the drive magnet 64 can also be appropriately selected from the materials listed for the driven magnet 54 .

The fixed-side repelling magnet 66 of the driving device 24 is embedded in the meat portion of the driving-side housing 60 that constitutes the central convex portion 60a. As shown in FIGS. 2 and 3, the fixed-side repulsion magnet 66 is arranged at a position closest to the rotation axis O. As shown in FIGS. As shown in FIG. 4, the fixed-side repulsion magnet 66 according to the present embodiment is a fixed-side inner/outer single-pole magnetized ring that revolves around the rotation axis O at a constant radius (a position at a predetermined distance from the rotation axis O). It is configured in a magnet 67 .

The fixed side inner/outer peripheral single-pole magnetized ring magnet 67 has a first polarity (S pole in FIG. 4) over the entire circumference of the outer periphery, and a second polarity opposite to the first polarity over the entire circumference of the inner periphery. (N pole in FIG. 4). That is, the outer peripheral surface of the fixed-side repulsion magnet 66 forms a fixed-side repulsion surface 66a on which the same polarity as that of the movable-side repulsion magnet 56 always exists along the circumferential direction. The material constituting the fixed-side repulsion magnet 66 is also not particularly limited, and the materials mentioned for the driven magnet 54 can be applied.

Here, the repulsion mechanism 78 composed of the movable-side repulsion magnet 56 and the fixed-side repulsion magnet 66 is configured to repel with a larger force (magnetic force) than the magnetic coupling mechanism 76 . For example, the repulsion mechanism 78 can obtain a strong repulsion force by making the distance between the movable-side repulsion magnet 56 and the fixed-side repulsion magnet 66 shorter than the distance between the driven magnet 54 and the drive magnet 64 . The configuration for increasing the repulsive force more than the magnetic coupling force is not particularly limited, and various methods such as forming the movable side repulsive magnet 56 or the fixed side repulsive magnet 66 larger, changing the composition ratio of the magnet material, etc. are possible. measures may be taken.

The axial length of the fixed side inner and outer single pole magnetized ring magnets 67 (fixed side repulsion magnets 66) is greater than the axial length of the movable side inner and outer single pole magnetized ring magnets 57 (movable side repulsion magnets 56). is set too long. As a result, even if the impeller 14 is displaced up and down due to the rotation of the impeller 14 when the pump main body 22 and the driving device 24 are attached, the repulsion mechanism 78 is able to rotate the fixed side inner and outer single-pole magnetized ring magnets 67 in the axial direction. The movable-side inner and outer single-pole magnetized ring magnets 57 are positioned at intermediate positions. For example, the axial length of the fixed side inner and outer single-pole magnetized ring magnets 67 is preferably set to be at least twice the axial length of the movable side inner and outer single-pole magnetized ring magnets 57 .

Returning to FIG. 2 , the controller 26 of the pump device 10 is composed of a well-known computer having an input/output interface, memory and processor (not shown), and controls driving of the motor mechanism 62 . A monitor, a speaker, operation buttons, etc. (not shown) are provided on the outer surface of the control unit 26, and a user such as a doctor or a nurse sets the driving contents of the pump device 10 by operating the operation buttons. The control unit 26 controls the supply of electric power from the battery based on the user's setting information, and rotates the shaft unit 72, for example, in the range of 0 to 80000 rpm.

Next, operation of the pump device 10 will be described.

A heart-lung machine 12 including a pump system 10 is configured for a patient to assist cardiopulmonary function. When constructing the heart-lung machine 12 , the user connects the blood removal tube 18 and the blood transfer tube 20 to the pump body 22 . Then, as shown in FIG. 2 , the pump device 10 is assembled by mounting the pump main body 22 on the drive device 24 . At this time, the user inserts the lower housing part 34 into the mounting groove 68 and positions and fixes the pump body 22 and the driving device 24 to each other by the engaging structure 44 .

As shown in FIGS. 3 and 4, in the mounted state, the driven magnet 54, movable-side repulsion magnet 56, driving magnet 64, and fixed-side repulsion magnet 66 are arranged at the same height position. More specifically, the stationary side repulsion magnet 66, the movable side repulsion magnet 56, the driven magnet 54, and the drive magnet 64 are arranged in this order radially outward from the rotation axis O.

The driven magnet 54 (driven side multi-pole magnetized ring magnet 55) and the drive magnet 64 (driving side multi-pole magnetized ring magnet 65), which are radially adjacent to each other, have different polarities opposed to each other for magnetic coupling. A mechanism 76 is formed. That is, the driven-side multi-pole magnetized ring magnet 55 and the drive-side multi-pole magnetized ring magnet 65 generate a magnetic coupling force (magnetic coupling force) so that the rotational force of the rotor 74 can be transmitted to the impeller 14. do.

Therefore, when the motor mechanism 62 of the driving device 24 rotates the shaft portion 72, the impeller 14 also rotates. When rotating, the impeller 14 can rotate without contact with the top and bottom of the body-side housing 32 due to the thrust direction bearings (ceiling side dynamic pressure bearing 41 and bottom side dynamic pressure bearing 43). The fin portion 46 rotating in the upper space 36a generates centrifugal force, thereby causing the blood to flow in the order of the inflow path 38a, the through hole 15, the circulation hole 50, and the outflow path 40a.

On the other hand, the movable-side repulsion magnet 56 and the fixed-side repulsion magnet 66 are radially adjacent to each other inside the magnetic coupling mechanism 76 . When the movable side repulsion surface 56a and the fixed side repulsion surface 66a of the same polarity face each other, a repulsive force acts. In particular, the movable-side repelling magnets 56 (movable-side inner/outer single-pole magnetized ring magnets 57) and fixed-side repulsive magnets 66 (fixed-side inner/outer single-pole magnetized ring magnets 67) have a uniform repulsive force in the entire circumferential direction. forming a radial bearing capable of being loaded.

The repulsive force of the repulsive mechanism 78 is set larger than the magnetic coupling force of the magnetic coupling mechanism 76 , effectively suppressing contact of the inner peripheral surface of the impeller 14 with the body-side housing 32 . Further, when the impeller 14 rotates, the fluid force f (inflow pressure and outflow pressure) of the blood applied to the magnetic coupling mechanism 76 and the impeller 14 may apply a force to tilt the impeller 14 with respect to the axial tube portion 35 . In contrast, the repulsive mechanism 78 according to the present embodiment generates a repulsive force greater than the sum of the magnetic coupling force and the fluid force f when the inner peripheral surface of the impeller 14 approaches the main body housing 32 by a predetermined amount or more. is designed to be Therefore, the non-contact state between the impeller 14 and the body-side housing 32 can be maintained more reliably.

In this way, the pump device 10 has a bearing in the thrust direction with the ceiling-side dynamic pressure bearing 41 and the bottom-side dynamic pressure bearing 43, and has a radial direction bearing (repulsion mechanism 78). The impeller 14 is rotated with respect to 32 without contact. Therefore, the pump device 10 can stably drive the impeller 14 to obtain a good centrifugal force, and the blood can flow smoothly in the artificial heart-lung machine 12 .

As described above, the pump device 10 according to this embodiment has the following effects.

The pump device 10 exerts a repulsive force between the fixed side repulsion surface 66 a and the movable side repulsion surface 56 a by the movable side repulsion magnet 56 and the fixed side repulsion magnet 66 . As a result, the impeller 14 having the movable-side repulsion magnets 56 is prevented from coming into contact with the fixed-side repulsion magnets 66 (that is, the body-side housing 32), and can rotate stably. In particular, the pump device 10 can maintain a good non-contact state even under conditions such as when the rotational speed of the impeller 14 is slow or when it receives a force in the radial direction. can be suppressed.

In the pump device 10, the movable-side inner and outer peripheral single-pole magnetized ring magnets 57 and the fixed-side inner and outer peripheral single-pole magnetized ring magnets 67 are used as the movable-side and fixed-side repulsive magnets 56 and 66, respectively. A repulsive force is generated evenly around the rotation axis O. This further increases the rotational stability of the impeller 14 . In addition, the pump device 10 is configured to transmit the rotational force of the drive magnet 64 to the impeller 14 in a non-contact manner using the magnetic coupling mechanism 76, and furthermore, the repulsion mechanism 78 can suppress radial deflection, so that the blood can be flow more smoothly.

In particular, in the pump device 10, the repulsive force between the movable-side repulsive magnet 56 and the fixed-side repulsive magnet 66 is large. can more reliably continue the non-contact state. In the pump device 10 , the repulsive mechanism 78 is provided inside the magnetic coupling mechanism 76 , so that repulsive force can be exerted on the impeller 14 radially outward from the inner side. Moreover, since the first gap 37a is narrower than the second gap 37b, the repelling force is easily transmitted from the fixed side repulsion magnet 66 to the movable side repulsion magnet 56, forming a stronger radial bearing. can do.

Furthermore, in the pump device 10, since the axial length of the fixed side repulsion magnet 66 is longer than the axial length of the movable side repulsion magnet 56, even if the impeller 14 is displaced in the rotation axis direction, the movable side repulsion magnet 56 and the fixed-side repulsion magnet 66 can be kept facing each other satisfactorily. Moreover, since the pump device 10 has the ceiling-side dynamic pressure bearing 41 and the bottom-side dynamic pressure bearing 43, the impeller 14 is prevented from contacting the body-side housing 32 in the axial direction, and the impeller 14 is further stabilized. can be rotated.

It should be noted that the pump device 10 according to the present invention is not limited to the above-described embodiment, and can adopt various application examples and modifications. For example, the pump device 10 described above has a configuration in which the pump main body 22 and the driving device 24 are detachably assembled, but is not limited to this. A device having a housing 30 is also possible.

Some modifications of the pump device 10 according to the present invention will be described below. It should be noted that, in the following description, the same reference numerals are given to the same configurations or the configurations having the same functions as the pump device 10 described above, and detailed description thereof will be omitted.

[First modification]
A pump device 10A according to the first modification shown in FIG. 5 differs from the pump device 10 in that a repulsion mechanism 78A is provided outside a magnetic coupling mechanism 76A. Specifically, the impeller 14A of the pump device 10A includes a radially inner driven magnet 54 (a driven side multi-pole magnetized ring magnet 55), and a radially outer side a movable side repelling magnet 56 (a movable side inner and outer single pole magnet). A magnetized ring magnet 57) is provided. Fixed side repelling magnets 66 (fixed side inner and outer single pole magnetized ring magnets 67) are provided in the body side housing 32 (lower housing portion 34) of the pump body 22A that accommodates the impeller 14A.

On the other hand, the driving device 24A has a peripheral convex portion 60b that constitutes the engagement structure 44 capable of holding the lower housing portion 34, while extending the shaft portion 72 instead of the central convex portion 60a. A driving magnet 64 (driving-side multipolar magnetized ring magnet 65 ) is provided on the outer peripheral surface of the shaft portion 72 .

In the pump device 10A described above, with the pump main body 22A and the drive device 24A attached, the drive magnet 64, the driven magnet 54, the movable side repulsion magnet 56, and the fixed side repulsion magnet 66 are arranged radially outward from the rotation axis O. Line up in order. While the driven magnet 54 and the drive magnet 64 form a magnetic coupling mechanism 76A, the movable side repulsion magnet 56 and the fixed side repulsion magnet 66 form a repulsion mechanism 78A outside thereof. Accordingly, the pump device 10A can obtain the same effect as the pump device 10. Also, as described above, the fixed-side repulsion magnet 66 is not particularly limited in its installation position, and can be said to be either the pump main body 22, 22A or the driving device 24, 24A.

[Second modification]
In a pump device 10B according to a second modification shown in FIG. 6, each of a driven magnet 54, a movable-side repulsion magnet 56, a drive magnet 64, and a fixed-side repulsion magnet 66 is combined with a plurality of arc-shaped magnets to form an annular shape. It is different from the pump devices 10 and 10A in that it is formed in the magnet group of .

For example, in FIG. 6, each of the driven magnets 54 and the driving magnets 64 is formed by arranging three arc-shaped magnets 80 having N and S poles along the circumferential direction to form an annular driven magnet group 82 and a driving magnet group. 84 is formed. Each of the movable-side repulsive magnets 56 and the fixed-side repulsive magnets 66 includes four circular arc-shaped magnets 90 magnetized with north and south poles along the radial direction. A side repulsion magnet group 94 is formed. In FIG. 6, the partition wall 86 is sandwiched between the magnets 80 and the magnets 90, but the partition wall 86 may not be interposed. Also, the numbers of the driven magnets 54, the movable side repulsion magnets 56, the drive magnets 64, and the fixed side repulsion magnets 66 may be appropriately designed.

In the pump device 10B configured as described above, the driven magnet group 82 and the drive magnet group 84 form a good magnetic coupling mechanism 76B, and the impeller 14 can be rotated together with the rotation of the motor mechanism 62. In the pump device 10B, the repulsion mechanism 78B is well formed by the movable-side repulsion magnet group 92 and the fixed-side repulsion magnet group 94, so that the impeller 14 can be stably rotated.

It should be noted that the present invention is not limited to the above-described embodiments, and various modifications can be made along the gist of the invention.

Claims (10)

a housing in which the first repelling magnets are arranged in a ring;
an impeller rotatably housed in the housing and having a second repelling magnet annularly arranged therein;
a motor mechanism that is built in the housing and rotates the driving magnet;
a driven magnet that is arranged on the impeller and rotates the impeller as the drive magnet rotates;
with
The first repulsion magnet and the second repulsion magnet are arranged along a radial direction orthogonal to the rotation axis of the impeller and have the same polarity on the opposing surfaces facing each other ,
The second repelling magnet is located at the same height as the driven magnet in the impeller and is radially spaced from the driven magnet.
A pump device characterized by: The pump device of claim 1, wherein
At least one of the first repulsion magnet and the second repulsion magnet is magnetized with a first polarity over the entire circumference of the outer peripheral portion, and has a second polarity opposite to the first polarity over the entire circumference of the inner peripheral portion. A pump device characterized by being a ring body magnetized in polarity. The pump device according to claim 2 , wherein
A pump device, wherein a repulsive force between the first repulsive magnet and the second repulsive magnet is greater than a magnetic coupling force of a magnetic coupling mechanism composed of the drive magnet and the driven magnet. The pump device according to claim 3 ,
The repulsive force is greater than the sum of the magnetic coupling force when the impeller approaches the housing by a predetermined amount or more and the fluid force applied to the impeller by the fluid flowing into the housing. pump device. In the pump device according to any one of claims 2 to 4 ,
A pump device, wherein a repulsion mechanism composed of the first repulsion magnet and the second repulsion magnet is provided inside the magnetic coupling mechanism. The pump device according to claim 5 , wherein
A first gap between the impeller and the housing in which the first repulsion magnets constituting the repulsion mechanism are arranged is defined by the impeller and the housing in which the drive magnets constituting the magnetic coupling mechanism are arranged. A pump device that is narrower than the second gap between. The pump device according to claim 6 ,
The housing has a central portion arranged radially inward of the impeller and a peripheral portion arranged radially outward of the impeller,
A pump device, wherein the first repelling magnet is fixed inside the central portion, and the driving magnet is rotatably arranged inside the peripheral portion. In the pump device according to any one of claims 2 to 7 ,
The housing includes a first housing having the impeller and a second housing having the motor mechanism,
A pump device, wherein the first housing and the second housing are configured to be detachable. In the pump device according to any one of claims 1 to 8 ,
A pump device, wherein the axial length of the first repulsion magnet parallel to the rotation axis is longer than the axial length of the second repulsion magnet parallel to the rotation axis. In the pump device according to any one of claims 1 to 9 ,
The pump device, wherein the housing has a hydrodynamic bearing at a location facing the impeller in a direction along the rotation axis.

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