JP4512149B2 - Artificial heart pump - Google Patents

Description

  The present invention relates to an artificial heart pump, and more particularly, to an artificial heart pump using an axial flow pump that pumps blood.

  Conventionally, an artificial heart pump that pumps blood by using the rotation of an impeller has been used as a medical alternative or auxiliary heart. As this artificial heart pump, those using a roller pump or a centrifugal pump and those using an axial pump are provided. Of these types of artificial heart pumps, those using an axial flow pump can be smaller in size than those used for a roller pump or a centrifugal pump.

  In a conventional artificial heart pump using this axial flow pump, a motor stator is included in a housing, and a rotor having an impeller around it includes a permanent magnet that performs a magnetic reaction with the motor stator. As such an artificial heart pump, as shown in FIG. 14, a rotor 104 having an impeller 105 on its outer peripheral surface is installed between fixed bodies 102 and 103 fixed to the housing 101. There are provided pivot bearings 106a and 106b installed on the surface facing the rotor 104. That is, the pivot bearings 106a and 106b are formed by projecting the center of the surface of the rotor 104 facing the fixed bodies 102 and 103.

  Further, as shown in FIG. 15, electromagnetic coils 111 and 112 that generate magnetic force are provided in the fixed bodies 102 and 103, and the rotor 104 is permanently attached to both ends so as to oppose the electromagnetic coils 111 and 112. By providing the magnets 113 and 114, a magnetic bearing that supports the rotor 104 by magnetic force is provided. In the artificial heart pump of FIG. 15, the position of the rotor 104 is detected by providing the position sensor 115 on the fixed body 102, and the amount of current of the electromagnetic coils 111 and 112 is adjusted so that the rotor 104 is in the optimum position. A set active magnetic bearing is configured.

  Further, as shown in FIG. 16, a fixed rotor 102 and 103 are connected by a fixed shaft 121, and a cylindrical rotor 122 that rotates along the outer periphery of the fixed shaft 121 is provided. There is provided a configuration in which a dynamic pressure bearing is configured by providing a groove on each surface facing each of 102 and 103. That is, when the rotor 122 rotates, the rotor 122 is fixed to the rotor 122 by the dynamic pressure generated when blood flows into a minute gap formed by grooves provided on the surfaces where the rotor 122 and the fixed bodies 102 and 103 face each other. The contact with the bodies 102 and 103 is prevented and the thrust bearing operates.

  However, when it supports by pivot bearing 106a, 106b like FIG. 14, abrasion powder may be produced | generated in pivot bearing 106a, 106b. In addition, since the gap between the fixed bodies 102 and 103 and the rotor 104 is narrowed, there is a possibility that a thrombus is easily formed or that red blood cells are destroyed (hemolysis). Further, when an active magnetic bearing is used as shown in FIG. 15, non-contact support is possible, but power for active control is required, and the configuration is complicated and the apparatus is enlarged. Furthermore, when the dynamic pressure bearing is configured as shown in FIG. 16, a narrow gap for generating dynamic pressure is required, and this gap may easily cause thrombus formation or hemolysis.

  In order to avoid such a problem, the present applicant not only constitutes a hydrodynamic bearing, but also uses a passive repulsive magnetic bearing that utilizes a magnetic repulsive force that balances the hydrothrust load applied to the impeller, so that the rotor and the fixed body An artificial heart pump that prevents contact with the body is proposed (see Patent Document 1). As shown in FIG. 17, the artificial heart pump equipped with this passive repulsive magnetic bearing has a configuration as shown in FIG. 16, and permanent magnets 131 and 132 are installed on the rotor 122 and the fixed body 103, respectively. A passive repulsive magnetic bearing with a magnetic repulsive force commensurate with the load is constructed.

Further, in addition to support by a pivot bearing as shown in FIG. 14, an artificial heart pump is provided in which permanent magnets are provided on each of a fixed body and a rotor before and after the rotor and floated in the axial direction (see Patent Document 2). . In this artificial heart pump, two sets of magnetic repulsions are provided at the front and rear of the rotor by installing permanent magnets at positions facing the two fixed bodies of the rotor and positions facing the rotor of the two fixed bodies, respectively. By applying force, the rotor is suspended and supported.
JP 2004-346930 A JP 2004-351213 A

  In the case of an artificial heart pump provided with a passive repulsive magnetic bearing as in Patent Document 1, the gap can be made wider than in the case of using only a dynamic pressure bearing as shown in FIG. 16, and thus the generation of thrombus and hemolysis can be reduced. Under operating conditions with a small hydrothrust load, and when starting and stopping, the magnetic repulsive force causes contact between the rotor portion and the fixed body before and after the rotor. Thereby, there is a possibility of generation of abrasion powder, thrombus and hemolysis due to contact between the rotor and the fixed body.

  Further, in the artificial heart pump configured as in Patent Document 1 and Patent Document 2, the position where the permanent magnet is installed is fixed. Therefore, it is necessary to perform processing for installing a permanent magnet on each of the rotor and the fixed body so that the gap between the rotor and the fixed body is an optimum distance, and it is difficult to control the distance by the processing. is there.

  In view of such a problem, an object of the present invention is to provide an artificial heart pump that can easily determine the installation position of a permanent magnet in order to set the gap between the rotor and the fixed body to an optimum distance. And

In order to achieve the above object, an artificial heart pump of the present invention includes a housing, a fixed shaft fixed at a central position in the housing, and the housing connected to both ends of the fixed shaft. Two stators, a sleeve fitted to the fixed shaft, a plurality of impellers projecting from the outer wall surface of the sleeve, and a motor stator that generates a rotating magnetic field included in a position surrounding the sleeve in the housing And an anisotropic permanent magnet included in the sleeve and generating a magnetic field perpendicular to the outer wall surface of the sleeve, and at least one of the fixed shafts of the fixed body, A first magnetic field generating portion that generates a magnetic field that is included in the vicinity of the connecting portion side and that prevents contact with the sleeve, and is included in the sleeve. A second magnetic field generating unit that generates a magnetic field that reacts with the first magnetic field generating unit to prevent contact with the fixed body, and adjusting a distance between the first and second magnetic field generating units, An adjusting unit for adjusting the magnetic force generated by the first and second magnetic field generating units;
The adjustment unit is a component that moves and sets an installation position of the first magnetic field generation unit in the fixed body in a direction parallel to the axial direction of the fixed shaft, and the component generates the first magnetic field. The distance between the first and second magnetic field generation units is adjusted by adjusting the installation position of the unit, and the fixed body includes an opening into which the first magnetic field generation unit is inserted. The first part, the cylindrical second part that covers the opening of the first part and has a hole that penetrates in the axial direction of the fixed shaft, and the second part are connected to the second part. A third part that covers a hole penetrating the two parts, and the part of the adjustment unit is installed in the hole of the second part while the first magnetic field generation unit is installed at the end on the fixed shaft side. Inserted into the hole of the second part from the end opposite to the fixed shaft side The adjustment lot is a screw-shaped adjustment lot, and the adjustment lot inserted into the hole of the second part from the fixed shaft side by a tool inserted into the hole of the second part from the side covered by the third part The distance between the first and second magnetic field generation units is adjusted by adjusting the length of the first and second magnetic field generation units. In such a configuration, a seal member is installed at a connection portion between the first and second parts so that fluid does not enter the fixed body.

  Further, in the above-described artificial heart pump, the adjustment unit is a component installed between the fixed shaft and the fixed body, and the distance between the opposing end surfaces of the fixed shaft and the fixed body by the component. By adjusting the distance, the distance between the first and second magnetic field generation units may be adjusted.

  At this time, the fixed body includes a protruding portion protruding toward the fixed shaft at a central position of a connection portion with the fixed shaft, and the fixed shaft includes a hole into which the protruding portion of the fixed body is inserted. The adjustment part has a ring shape around the protrusion, and the distance between the first and second magnetic field generators is adjusted according to the number of parts around the protrusion. The fixed shaft includes a protruding portion protruding toward the fixed body at a central position of a connection portion with the fixed body, and the fixed body has a hole into which the protruding portion of the fixed shaft is inserted. And the distance between the first and second magnetic field generators is adjusted according to the number of parts that are mounted on the protruding portion. It does not matter as a thing.

  Furthermore, in the above-described artificial heart pump, a thrust dynamic pressure groove that generates a dynamic pressure when a fluid flows may be formed on an end surface of the fixed body facing the sleeve. Further, a gap sensor for measuring the distance from the end surface of the sleeve may be provided in the fixed body.

  In the above-described artificial heart pump, the first and second magnetic field generation units may be permanent magnets that generate the repulsive magnetic force by facing the same pole, and are fixed including the fixed body and the fixed shaft. The material constituting the member and the material constituting the rotating member including the sleeve may be different in hardness.

  According to the present invention, since the adjusting portion that adjusts the distance between the first and second repulsive magnetic bearing magnets is provided, the first and second generated at both ends of the sleeve so that the sleeve and the fixed body do not come into contact with each other. The repulsive magnetic force by the second repulsive magnetic bearing magnet can be easily adjusted. Further, the first and second magnetic field generation is performed by adjusting the length of the adjustment lot inserted from the fixed shaft side into the hole of the second part by the tool inserted into the hole of the second part from the side covered by the third part. Since the distance between the parts is adjusted, the repulsive magnetic force by the first and second repulsive magnetic bearing magnets can be easily adjusted without changing the distance between the fixed bodies. Moreover, the repulsive magnetic force which generate | occur | produces in the both ends of a sleeve can be easily adjusted by comprising an adjustment part with the components installed between a fixed shaft and a fixed body.

<First Reference Example>
A first reference example of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing a configuration of an artificial heart pump in this reference example. In addition, below, it demonstrates as front (upstream side) and back (downstream side) according to the flow of blood.

  The artificial heart pump of FIG. 1 has a cylindrical housing 1, a plurality of diffusers 2 joined to the inner wall surface of the housing 1, and a plurality of diffusers 2 projecting from the outer wall surface, thereby being supported by the housing 1. From the fixed body 3, the fixed shaft 4 installed in front of the fixed body 3, the sleeve 5 installed so as to be wrapped around the fixed shaft 4 and rotating on the outer periphery of the fixed shaft 4, and the outer wall surface of the sleeve 5 A plurality of projecting impellers 6, a plurality of rectifying plates 7 provided in front of the impeller 6 and joined to the inner wall surface of the housing 1, and connected to the fixed shaft 4, the rectifying plate 7 projects from the outer wall surface. And a fixed body 8 supported by the housing 1 thereby.

  This artificial heart pump is provided with a polar anisotropic permanent magnet 5 a inside the sleeve 5 and a motor stator 1 a made of an electromagnetic coil whose magnetic pole faces the outer wall surface of the sleeve 5 inside the housing 1. A plurality of polar anisotropic permanent magnets 5 a are provided radially about the central axis X of the artificial heart pump, and the direction of the magnetic flux is perpendicular to the inner wall surface of the housing 1. Further, the magnetic poles facing the inner wall surface of the housing 1 of the adjacent polar anisotropic permanent magnet 5a are set to the opposite polarity. Therefore, by causing currents having different phases, such as three-phase current, to flow through the magnetic coils constituting the motor stator 1a, rotating power acts on the polar anisotropic permanent magnet 5a, and the sleeve 5 and the impeller 6 rotate as a motor rotor.

  A ring-shaped permanent magnet 5b is included in the front tip portion of the sleeve 5, and a permanent magnet 8a having a rear surface facing the front surface of the permanent magnet 5b is included in the fixed body 8. Is done. At this time, since the magnetic pole on the front surface of the permanent magnet 5b and the magnetic pole on the rear surface of the permanent magnet 8a have the same polarity, the magnetic repulsive force of the permanent magnets 5b and 8a acts. Further, a ring-shaped permanent magnet 5c is included in the rear tip portion of the sleeve 5, and a permanent magnet 3a whose front surface is opposed to the rear surface of the permanent magnet 5c is included in the fixed body 3. Is done. At this time, since the magnetic pole on the rear surface of the permanent magnet 5c and the magnetic pole on the front surface of the permanent magnet 3a have the same polarity, the magnetic repulsive force of the permanent magnets 5c and 3a acts.

  The permanent magnets 5b and 8a and the permanent magnets 5c and 3a function as a thrust bearing with respect to the axial direction of the central axis X, and the magnetic repulsive forces of the permanent magnets 5b and 8a and the permanent magnets 5c and 3a drive the artificial heart pump. Sometimes, the pressure behind the impeller 6 is increased, so that the sleeve 5 is adjusted so as to balance the hydrothrust load that is the force to move forward. This prevents contact between the rear end face 5x of the sleeve 5 and the front end face 3x of the fixed body 3 and contact between the front end face 5y of the sleeve 5 and the rear end face 8x of the fixed body 8 when the sleeve 5 rotates. Can do. Further, even at the time of starting / stopping and operating conditions where the hydrothrust load is small, the rear end surface 5x of the sleeve 5 and the front end surface 3x of the fixed body 3 are caused by the magnetic repulsive forces of the permanent magnets 5b, 8a and the permanent magnets 5c, 3a And the contact between the front end surface 5y of the sleeve 5 and the rear end surface 8x of the fixed body 8 can be prevented.

  Further, rectifying plates 7 having both edges joined to the outer wall surface of the fixed body 8 and the inner wall surface of the housing 1 are arranged at equal intervals in the circumferential direction around the central axis X. Further, the outer wall surface of the fixed body 3 And the diffuser 2 whose both edges are joined to the inner wall surface of the housing 1 are arranged at equal intervals in the circumferential direction around the central axis X. And each of the front end of the fixed body 8 and the rear end of the fixed body 3 has a structure in which the central portion is raised. Therefore, the blood taken in by the bulge at the front end of the fixed body 8 is branched without resistance and guided to the rectifying plate 7, and the blood rectified by the diffuser 2 by the bulge at the rear end of the fixed body 3 is guided without resistance. .

  Further, the fixed bodies 3 and 8 and the fixed shaft 4 are respectively connected to the end surfaces 3x and 8x of the fixed bodies 3 and 8 in holes 4a and 4b provided at the center positions of both end faces 4x and 4y of the fixed shaft 4, respectively. The protrusions 3b and 8b provided at the center position are inserted and connected. Each of the holes 4a and 4b and the protruding portions 3b and 8b are formed in a threaded shape, and the protruding portions 3b and 8b are rotated and inserted into the holes 4a and 4b, so that the fixed shaft around which the sleeve 5 is mounted is fixed. Fixed bodies 3 and 8 are fixed to 4.

  Further, between the front end surface 3x of the fixed body 3 and the rear end surface 4x of the fixed shaft 4, one or more adjustment rings 9 for adjusting the gap between the rear end surface 5x of the sleeve 5 and the front end surface 3x of the fixed body 3 are provided. One or more adjustment rings 9 that are installed and adjust the gap between the front end surface 5 y of the sleeve 5 and the front end surface 8 x of the fixed body 8 between the rear end surface 8 x of the fixed body 8 and the front end surface 4 y of the fixed shaft 4. Is installed. At this time, the adjustment ring 9 is mounted on the protrusions 3b and 8b of the fixed bodies 3 and 8, and the fixed bodies 3 and 8 on which the adjustment ring 9 is mounted are inserted into the fixed shaft 4. The gap between the fixed bodies 3 and 8 and the sleeve 5 is adjusted.

  When configured in this way, a trial run is performed at the time of manufacture, and the gap between the fixed bodies 3 and 8 and the sleeve 5 by the adjustment ring 9 is measured, whereby the fixed bodies 3 and 8 and the sleeve 5 by the adjustment ring 9 are measured. The gap is adjusted. By adjusting the adjustment ring 9, the gap between the fixed bodies 3, 8 and the sleeve 5 is adjusted so that the fixed bodies 3, 8 do not come into contact with the sleeve 5 under the operating conditions to be used. At this time, the gap sensor 10 is installed on each of the end faces 3x and 8x inside the fixed body 3 or the fixed body 8 as shown in FIG. The gap between the bodies 3, 8 and the sleeve 5 is measured. Therefore, the gap between the fixed body 3 and the sleeve 5 is measured by the gap sensor 10 inside the fixed body 3, and the gap between the fixed body 8 and the sleeve 5 is measured by the gap sensor 10 inside the fixed body 8.

  The gap sensor 10 may be installed only on one of the fixed bodies 3 and 8. That is, when the gap sensor 10 is installed inside the fixed body 3, the gap between the fixed body 3 and the sleeve 5 is measured by the gap sensor 10. Then, the gap between the fixed body 8 and the sleeve 5 is determined by the measured gap between the fixed body 3 and the sleeve 5, the number of adjustment rings 9 installed, and the axial lengths of the fixed shaft 4 and the sleeve 5. Desired.

  When the gap between the fixed bodies 3 and 8 and the sleeve 5 is set to an appropriate distance using the adjustment ring 9, the fixed body 3 or the fixed body 8 is removed after the fixed body 3 or the fixed body 8 is removed from the fixed shaft 4. The gap sensor 10 included in any of the bodies 8 may be removed. Then, the fixed bodies 3 and 8 in which the confirmed number of adjustment rings 9 are mounted on the protrusions 3b and 8b are reconnected to the fixed shaft 4 on which the sleeve 5 is mounted. Note that the measurement of the gap at an appropriate distance between the fixed bodies 3 and 8 and the sleeve 5 is not performed by the gap sensor 10 but the contact between the fixed bodies 3 and 8 and the sleeve 5 is measured from the outside. It doesn't matter.

  Furthermore, in this reference example, both the fixed bodies 3 and 8 are provided with the protrusions 3b and 8b, and the holes 4a and 4b are provided on both end faces 4x and 4y of the fixed shaft 4. One of these may be provided with a protrusion, and a hole may be provided on the end surface of the fixed shaft 4 on the side to which the fixing body having the protrusion is connected. That is, when the fixed body 3 includes the protruding portion 3b and the fixed body 8 does not have the protruding portion 8b, the hole 4a is provided only in the end surface 4x of the fixed shaft 4, and the end surface 4y is directly the end surface of the fixed body 8. When the fixed body 8 has a protrusion 8b and the fixed body 3 has no protrusion 3b, a hole 4b is provided in the end surface 4y of the fixed shaft 4 so that the end surface 4x is directly fixed. Connected to the end face 3 x of the body 3.

<Second Reference Example>
A second reference example of the present invention will be described with reference to the drawings. FIG. 2 is a cross-sectional view showing the configuration of the artificial heart pump in this reference example. 2 that are the same as those in FIG. 1 are given the same reference numerals, and detailed descriptions thereof are omitted.

  The artificial heart pump of FIG. 2 has a configuration in which the permanent magnets 5c and 3a are omitted from the configuration of the artificial heart pump of FIG. 1, and an adjustable configuration by the adjustment ring 9 is only on the fixed body 8 side. That is, the gap between the fixed bodies 3 and 8 and the sleeve 5 is adjusted by the number and thickness of the adjusting rings 9 mounted on the protrusions 8b included in the fixed body 8, so that the permanent magnet 5b can be used under the operating conditions to be used. , 8a functions as a thrust bearing so that the magnetic repulsive force of the permanent magnets 5b, 8a is adjusted to balance the hydrothrust load.

  In such an artificial heart pump, the fixed shaft 4 is connected to the fixed body 2 fixed to the housing 1 by being connected to the inner edge of the diffuser 2 whose outer edge is connected to the housing 1. Is fixed to the housing 1 via the fixed body 2. Then, the fixed body 8 in which the adjustment ring 9 is mounted on the protruding portion 8 b is connected to the fixed shaft 4 so that the protruding portion 8 b is inserted into the hole 4 b of the fixed shaft 4. Thus, the adjustment ring 9 is installed between the fixed shaft 4 and the fixed body 8, and the distance between the fixed bodies 3 and 8 is adjusted, so that the fixed bodies 3 and 8 and the sleeve can be used under the operating conditions to be used. The gap between the fixed bodies 3, 8 and the sleeve 5 is adjusted so that 5 does not contact.

  In this reference example, the fixed body 8 side including the permanent magnet 8a functioning as a thrust bearing is adjustable. However, the fixed body 3 side without a permanent magnet may be adjustable. In other words, the protrusion 3b is provided on the fixed body 3, and the hole 4a is provided on the end surface 4x of the fixed shaft 4, so that the gap between the fixed bodies 3 and 8 and the sleeve 5 is reduced by the adjustment ring 9 that is wrapped around the protrusion 3b. It does not matter as a thing to adjust.

<Third reference example>
A third reference example of the present invention will be described with reference to the drawings. FIG. 3 is a cross-sectional view showing the configuration of the artificial heart pump in this reference example. In FIG. 3, the same parts as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The artificial heart pump of FIG. 3 has a magnetic body 3c installed at the installation position of the permanent magnet 3a instead of the permanent magnets 3a, 5b, 5c, 8a in the configuration of the artificial heart pump of FIG. The attractive force by the permanent magnet 5a is used as a function of the thrust bearing, and the adjustable structure by the adjusting ring 9 is only the fixed body 3 side. That is, the gap between the fixed bodies 3 and 8 and the sleeve 5 is adjusted by the number and thickness of the adjusting rings 9 mounted on the protrusions 3b of the fixed body 3, so that the magnetic body 3c can be used under the operating conditions to be used. And the polar anisotropic permanent magnet 5a function as a thrust bearing so that the attractive force of the magnetic body 3c and the polar anisotropic permanent magnet 5a is adjusted to balance the hydrothrust load.

  In such an artificial heart pump, the fixed shaft 4 is connected to the fixed body 8 fixed to the housing 1 by being connected to the inner edge of the rectifying plate 7 whose outer edge is connected to the housing 1. 4 is fixed to the housing 1 via a fixed body 8. Then, the fixed body 3 in which the adjustment ring 9 is mounted on the protrusion 3 b is connected to the fixed shaft 4 so that the protrusion 3 b is inserted into the hole 4 a of the fixed shaft 4. Thus, the adjustment ring 9 is installed between the fixed shaft 4 and the fixed body 8, and the distance between the fixed bodies 3 and 8 is adjusted, so that the fixed bodies 3 and 8 and the sleeve can be used under the operating conditions to be used. The gap between the fixed bodies 3, 8 and the sleeve 5 is adjusted so that 5 does not contact.

  In this reference example, the fixed body 3 side including the magnetic body 3c functioning as a thrust bearing is adjustable. However, the fixed body 8 side without the magnetic body may be adjustable. That is, the protrusion 8b is provided in the fixed body 8 and the hole 4b is provided in the end surface 4y of the fixed shaft 4, so that the gap between the fixed bodies 3 and 8 and the sleeve 5 is reduced by the adjustment ring 9 that is wrapped around the protrusion 8b. It does not matter as a thing to adjust.

  In the first to third reference examples, both the diffuser 2 and the current plate 7 are connected to the outer wall surfaces of the fixed bodies 3 and 8, and the outer edge is connected to the inner wall surface of the housing 1. However, in either one of the diffuser 2 and the rectifying plate 7, one of the inner edge and the outer edge may be connected and fixed.

  That is, when configured as in the first or second reference example, as shown in FIG. 4A, the inner edge of the current plate 7 is connected and fixed to the fixed body 8 and the outer edge of the current plate 7 is separated. As shown in FIG. 4B, the outer edge of the current plate 7 may be connected and fixed to the housing 1 and the inner edge of the current plate 7 may be separated. Thereby, compared with the case where the inner edge and the outer edge of the baffle plate 7 are connected together, since the separation of the fixed body 8 is easy, adjustment by the adjustment ring 9 is facilitated.

  When configured as in the first or third reference example, as shown in FIG. 4C, the inner edge of the diffuser 2 is connected and fixed to the fixed body 3 and the outer edge of the diffuser 2 is separated. Alternatively, as shown in FIG. 4D, the outer edge of the diffuser 2 may be connected and fixed to the housing 1 and the inner edge of the diffuser 2 may be separated. Thereby, compared with the case where the inner edge and the outer edge of the diffuser 2 are connected together, the separation of the fixed body 3 is easier, and the adjustment by the adjustment ring 9 becomes easier.

  Further, when configured as in the first or second reference example, the protrusion 8b is provided on the fixed body 8 and is inserted into the hole 4a of the fixed shaft 4 to be fixed, but FIG. As described above, the protrusion 4c is provided at the center position of the end face 4y on the fixed body 8 side of the fixed shaft 4, and the hole 8c into which the protrusion 4c is inserted is provided at the center position of the rear end face 8x of the fixed body 8. It doesn't matter. At this time, the adjustment ring 9 is mounted on the protrusion 4c and inserted into the hole 8c. Similarly, even when configured as in the first or third reference example, the protrusion 4d is provided at the center position of the end surface 4x on the fixed body 3 side of the fixed shaft 4 as shown in FIG. 5B. In addition, the hole 3d into which the protrusion 4d is inserted may be provided at the center position of the front end surface 3x of the fixed body 3. At this time, the adjustment ring 9 is mounted on the protrusion 4d and inserted into the hole 3d.

<Fourth Reference Example>
A fourth reference example of the present invention will be described with reference to the drawings. FIG. 6 is a cross-sectional view showing the configuration of the artificial heart pump in this reference example. In FIG. 6, the same parts as those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The artificial heart pump shown in FIG. 6 differs from the artificial heart pump shown in FIG. 1 in that each of the fixed bodies 3 and 8 can be divided into a plurality of parts, and the adjustment ring 9 includes the fixed bodies 3 and 8 and the fixed shaft 4. Instead of being installed between the two, the spacers 11 for determining the installation positions of the permanent magnets 3a, 8a in the fixed bodies 3, 8 are used. In this artificial heart pump, the fixed body 3 is composed of a fixed body part 31 having a diffuser 2 installed on the outer peripheral surface, and a discharge cone 32 inserted into the fixed body part 31 and having a raised rear tip. The fixed body 8 is constituted by a fixed body part 81 in which the rectifying plate 7 is installed on the outer peripheral surface, and a suction cone 82 which is inserted into the fixed body part 81 and the front tip portion is raised.

  The fixed body component 31 has a structure in which the inside is stepped from the rear end face to the front, that is, a hole 33 having a large inner diameter is formed on the rear end face side. A hole 34 having an inner diameter narrower than that of the hole 33 is formed in the bottom surface portion of the plate. A ring-shaped groove 35 is formed around the hole 34 at the bottom surface of the hole 33, and the spacer 11 and the permanent magnet 3 a are inserted into the ring-shaped groove 35 and installed. Further, the gap sensor 10 is installed between the bottom surface of the hole 34 and the front end surface 3x of the fixed body component 31.

  The discharge cone 32 is formed with a projection 36 to be inserted into the hole 34, and is inserted into the hole 33 at the rear side of the projection 36 and has a cylinder having an outer diameter substantially equal to the inner diameter of the hole 33. A portion 37, a groove 38 formed in a ring shape on a part of the outer wall surface of the cylindrical portion 37, and an O-ring 39 formed of an elastic body fitted in the groove 38. Each of the hole 34 of the fixed body component 31 and the protrusion 36 of the discharge cone 32 is formed into a threaded shape, and the protrusion 36 is rotated and inserted into the hole 34, so that the discharge to the fixed body component 31 is performed. A cone 32 is installed.

  Similarly, the fixed body component 81 has a stepped structure in which a hole 83 having a large inner diameter and a hole 84 having a small inner diameter are formed from the front end face toward the rear, and at the bottom portion of the hole 83, A ring-shaped groove 85 is formed around the hole 84. The spacer 11 and the permanent magnet 8a are inserted into the groove 85, and the gap sensor 10 is installed between the bottom surface of the hole 84 and the rear end surface 8x of the fixed body 81. The suction cone 82 includes a protrusion 86 and a cylindrical portion 87 inserted into the holes 84 and 83, a groove 88 formed in a part of the outer wall surface of the cylindrical portion 87, and an O fitted in the groove 88. A ring 89. Then, the hole 84 of the fixed member 81 and the projection 86 of the suction cone 82 are each threaded, and the protrusion 86 is rotated and inserted into the hole 84, and the suction cone 82 is inserted into the fixed component 81. Is installed.

  Thus, when the fixed bodies 3 and 8 are formed, after the fixed body parts 31 and 81 are connected to the fixed shaft 4 around which the sleeve 5 is mounted, the grooves 35 of the respective fixed body parts 31 and 81 are provided. , 85 are inserted with a plurality of spacers 11 and permanent magnets 3a, 8a. At this time, the depth of the groove 35 with respect to the axial direction of the central axis X is equal to the sum of the lengths of the plurality of spacers 11 and permanent magnets 3a inserted into the groove 35 with respect to the axial direction of the central axis X. The depth with respect to the axial direction of the central axis X of 85 is equal to the sum of the lengths with respect to the axial direction of the central axes X of the plurality of spacers 11 and permanent magnets 8a inserted into the groove 85.

  Then, the protrusions 36 of the discharge cone 32 are inserted into the holes 34 of the fixed body part 31 where the spacers 11 and the permanent magnets 3a are installed so as to fit into the respective thread grooves, and discharged to the fixed body part 31. The cone 32 is fixed. Similarly, the protrusion 86 of the suction cone 82 is inserted into the hole 84 of the fixed body part 81 where the spacer 11 and the permanent magnet 8a are installed so as to fit into the respective thread grooves, and the fixed body part 81 is sucked. Cone 82 is fixed. At this time, the gap between the inner wall surface of the stationary part 31 and the outer wall surface of the discharge cone 32 is sealed by the O-ring 39 installed in the groove 38 in the cylindrical portion 37 of the discharge cone 32, and the cylinder of the suction cone 82 is sealed. The gap between the inner wall surface of the stationary part 81 and the outer wall surface of the suction cone 82 is sealed by an O-ring 89 installed in the groove 88 in the portion 87. Thereby, the inflow of the blood into the fixed bodies 3 and 8 is prevented.

  When comprised in this way, while the distance of permanent magnet 3a, 5c is set by the number of the spacers 11 installed ahead of the permanent magnet 3a, while the magnetic repulsive force by permanent magnet 3a, 5c is determined. The distance between the permanent magnets 8a and 5b is set according to the number of the spacers 11 installed behind the permanent magnet 8a, and the magnetic repulsive force by the permanent magnets 8a and 5b is determined.

  Therefore, when configured as described above at the time of manufacture, a trial operation is performed as in the first reference example, and the fixed body 3 is operated under the operating condition where the hydrothrust load is small when the sleeve 5 is started and stopped by the gap sensor 10. The gap between 8 and the sleeve 5 is measured. Then, in the fixed body 3, the number of the spacers 11 installed in front of the permanent magnet 3 a is set so that the gap between the fixed bodies 3 and 8 and the sleeve 5 becomes an appropriate distance. The number of spacers 11 installed behind 8a is set, and the installation positions of permanent magnets 3a and 8a are determined. When the installation positions of the permanent magnets 3a and 8a are thus determined, after the gap sensor 10 is removed from the fixed body parts 31 and 81, the discharge cone 32 and the suction cone 82 are again used for the fixed body. Installed on the parts 31 and 81. In the product stage, instead of installing the O-rings 39 and 89, the space formed by the groove 38 of the discharge cone 32 and the inner wall surface of the fixing part 31 is welded, and the groove 88 of the suction cone 82 and the fixing part 81 The interior of the fixed bodies 3 and 8 is sealed by welding the space formed by the inner wall surface.

  In this reference example, the gap sensor 10 is installed in each of the fixed body parts 31, 81. However, the gap sensor 10 is installed in only one of the fixed body parts 31, 81. It doesn't matter. That is, when the gap sensor 10 is installed inside the fixed body component 31, the gap between the fixed body 3 and the sleeve 5 is measured by the gap sensor 10. Then, the gap between the fixed body 8 and the sleeve 5 is determined by the measured gap between the fixed body 3 and the sleeve 5 and the axial lengths of the fixed shaft 4 and the sleeve 5. Further, the measurement of the gap at an appropriate distance between the fixed bodies 3 and 8 and the sleeve 5 is not performed by the gap sensor 10, but the contact between the fixed bodies 3 and 8 and the sleeve 5 may be measured externally. I do not care.

  As described above, according to this reference example, the installation positions of the permanent magnets 3a and 8a can be easily adjusted by the spacer 11, and the thrust force acting by the permanent magnets 3a, 8a, 5b and 5c can be easily adjusted. be able to. Also, in this reference example, unlike the first reference example, the front end face 3x of the fixed body 3 and the fixed body 8 are changed in order to change the installation positions of the permanent magnets 3a, 8a inside the fixed bodies 3, 8. The thrust force can be adjusted while maintaining a constant distance from the rear end face 8x.

  In this reference example, the permanent magnets 3a, 8a, 5b, and 5c are provided and the positions of the permanent magnets 3a and 8a can be adjusted by both the fixed bodies 3 and 8. Only one of the positions may be adjusted. Similarly to the second reference example, as shown in FIG. 7, the permanent magnets 5c and 3a are omitted from the configuration of the artificial heart pump shown in FIG. It does not matter if only the side is used. Further, similarly to the third reference example, as shown in FIG. 8, a magnetic body 3 c is provided instead of the permanent magnets 3 a, 8 a, 5 b, and 5 c of the configuration of the artificial heart pump of FIG. The position of the magnetic body 3c may be adjusted only with the fixed body 3 side.

<First Embodiment>
A first embodiment of the present invention will be described with reference to the drawings. FIG. 9 is a cross-sectional view showing the configuration of the artificial heart pump in the present embodiment. 9, the same parts as those in FIG. 6 are denoted by the same reference numerals, and detailed description thereof is omitted.

  The artificial heart pump shown in FIG. 9 is different from the artificial heart pump shown in FIG. 6 in the structure of the fixed bodies 3 and 8, and includes a screw portion instead of setting the installation positions of the permanent magnets 3 a and 8 a by the spacer 11. Setting positions of the permanent magnets 3a and 8a are set by the adjustment lot 12. In this artificial heart pump, the fixed body 3 includes a fixed body part 301 having an opening on the rear side, a discharge cone stationary part 302 inserted into an opening on the rear side of the fixed body part 301, and a discharge cone stationary part 302. A discharge cone tip 303 to be inserted into a hole provided in the control hole, and an adjustment lot 12 to which a permanent magnet 3a is connected. Similarly to the fixed body 3, the fixed body 8 includes a fixed body part 801 having an opening on the front side, a suction cone stationary part 802 inserted into the opening of the fixed body part 801, and a suction cone stationary part 802. A suction cone tip 803 to be inserted into a hole provided in the control hole, and an adjustment lot 12 to which a permanent magnet 8a is connected.

  Each of the fixed body parts 301 and 801 has a cylindrical shape. The fixed body part 301 includes a bottom surface on the front side, and the fixed body component 801 includes a bottom surface on the rear side. Further, the discharge cone stationary portion 302 inserted into the opening on the rear side of the fixed body component 301 has an outer diameter of the portion inserted into the opening of the fixed body component 301 on the front side thereof. The step structure is such that the outer diameter of the portion that is not inserted into the opening of the fixed part 301 is substantially equal to the inner diameter of the opening 301 and equal to the outer diameter of the fixed part 301. The discharge cone stationary portion 302 is welded at a portion in contact with the end face of the opening of the fixed member 301 so as to be integrated with the fixed member 301.

  Further, the discharge cone stationary portion 302 has a structure curved toward the center on the rear side thereof, and a flat end surface 304 near the center position so as to come into contact with the front end surface of the discharge cone tip portion 303. Is formed. The discharge cone stationary portion 302 is formed with a hole penetrating in the axial direction of the central axis X. The discharge cone tip portion 303 is inserted from the rear side of the hole, and the adjustment lot 12 is inserted from the front side of the hole. Inserted. The discharge cone tip 303 has a structure in which the rear portion is curved toward the center and the center portion is raised, and a protruding portion 307 protruding from the front portion is provided. The protruding portion 307 is a hole in the discharge cone stationary portion 302. Inserted into. Further, a ring-shaped groove 305 is provided on the rear end surface 304 of the discharge cone stationary portion 302, and an elastic O-ring 306 is fitted into the groove 305, so that the discharge cone tip 303 and the discharge cone stationary A seal is made at the contact surface of the part 304.

  The suction cone stationary part 802 has a structure curved toward the center on the front side thereof, like the discharge cone stationary part 302, and has a flat end surface 804 near the center position. A hole penetrating in the direction is formed. The suction cone tip 803 is provided with a protruding portion 807 protruding at the rear part, like the discharge cone tip 303, and this protruding portion 807 is inserted into the hole of the suction cone stationary portion 802. In addition, a ring-shaped groove 805 is provided on the end surface 804 of the suction cone stationary portion 802, and an O-ring 806 made of an elastic body is fitted into the groove 805.

  Further, the adjustment lot 12 inserted from the front hole of the discharge cone stationary part 302 and the rear hole of the suction cone stationary part 802 has a configuration in which two cylindrical structures 121 and 122 having different diameters overlap each other in the stop axis X direction. Thus, the diameter of the columnar structure 121 on the side inserted into the discharge cone stationary portion 302 and the suction cone stationary portion 802 is substantially equal to the inner diameter of the holes of the discharge cone stationary portion 302 and the suction cone stationary portion 802. The diameter of the columnar structure 122 surrounded by the fixed body parts 301 and 801 is larger than the diameter of the columnar structure 121. And the permanent magnets 3a and 8a are installed in the adjustment lot 12 so that the inner peripheral surface of the permanent magnets 3a and 8a contacts the outer peripheral surface of the columnar structure 122.

  Further, the holes of the discharge cone stationary portion 302 and the suction cone stationary portion 802, the projections 307 and 807 of the discharge cone tip portion 303 and the suction cone tip portion 803, respectively, and the columnar structure 121 of the adjustment lot 12 were respectively threaded. Shaped. Therefore, the protrusion 307 and the columnar structure 121 are rotated and inserted into the hole of the discharge cone stationary portion 302, whereby the discharge cone tip 303 and the adjustment lot 12 are fixed to the discharge cone stationary portion 302, and the suction cone The protrusion 807 and the columnar structure 121 are rotated and inserted into the hole of the stationary part 802, so that the suction cone tip 803 and the adjustment lot 12 are fixed to the suction cone stationary part 802.

  In this way, when the fixed bodies 3 and 8 are formed, first, the fixed body parts 301 and 801 are connected to the fixed shaft 4 around which the sleeve 5 is mounted, and then the discharge cone stationary portion 302 and the suction cone stationary position. The adjustment lot 12 in which the permanent magnets 3a and 8a are installed is inserted into each hole of the part 802. Then, the discharge cone stationary part 302 and the suction cone stationary part 802 are fixed to the fixing parts 301 and 801 from the side where the adjustment lot 12 is inserted so that the cylindrical structure 122 of the adjustment lot 12 is covered with the fixing parts 301 and 801, respectively. Insert into the opening. That is, the permanent magnet 3a is installed in a closed space constituted by the fixing part 301 and the discharge cone stationary part 302, and the permanent magnet 8a is closed by the fixing part 801 and the suction cone stationary part 802. Installed in the space.

  When the discharge cone stationary part 302 and the suction cone stationary part 802 are respectively inserted into the fixing parts 301 and 801 and are connected by welding, the end surfaces 304 of the discharge cone stationary part 302 and the suction cone stationary part 802 are respectively connected. , 804, the projections 307 and 807 of the discharge cone tip 303 and the suction cone tip 803, respectively, are inserted. Then, a trial operation is performed, and the gap between the fixed bodies 3 and 8 and the sleeve 5 is measured under operating conditions where the hydrothrust load is small and at the time of start / stop.

  In this way, when the artificial heart pump is manufactured and the gap between the fixed bodies 3 and 8 and the sleeve 5 is measured by trial operation, the distance between the measured fixed bodies 3 and 8 and the sleeve 5 is optimum. Thus, the installation positions of the permanent magnets 3a and 8a are set. At this time, the discharge cone tip 303 and the suction cone tip 803 are removed from the discharge cone stationary portion 302 and the suction cone stationary portion 802, respectively.

  Then, the tool is inserted through the holes of the discharge cone stationary part 302 and the suction cone stationary part 802, the adjustment lot 12 is rotated by the tool, and the adjustment lot 12 is moved in the axial direction of the central axis X, so that the permanent The installation positions of the magnets 3a and 8a are set. A groove having the same shape as the tip shape of the tool is formed on the end surface 123 of the cylindrical structure 121 of the adjustment lot 12, and the adjustment lot 12 is rotated by inserting the tip of the tool into the groove.

  In the product stage, after setting the installation positions of the permanent magnets 3a and 8a, the adjustment lot 12 and the inner wall surface of the hole of the discharge cone stationary portion 302 are fixed by welding or an adhesive, and the adjustment lot 12 and the suction cone stationary portion are fixed. By fixing the inner wall surface of the hole 802 with welding or an adhesive, the adjustment lot 12 is stopped and fixed. Thereafter, the discharge cone tip 303 and the suction cone tip 803 are again inserted into the discharge cone stationary portion 302 and the suction cone stationary portion 802, respectively. At this time, instead of installing the O-rings 306 and 806, the space between the groove 305 of the discharge cone stationary portion 302 and the front surface of the discharge cone tip portion 303 is welded, and the groove 805 of the suction cone stationary portion 802 and the suction The interior of the fixed bodies 3 and 8 is sealed by welding a space defined by the rear side surface of the cone tip 803.

  Thus, according to this embodiment, the installation position of the permanent magnets 3a and 8a can be easily adjusted using a tool. In this embodiment, as in the fourth reference example, the gap sensor 10 is installed on at least one of the fixed body parts 301 and 801, and is used for measuring the gap between the fixed bodies 3 and 8 and the sleeve 5 during the trial run. It does n’t matter. Further, instead of using the gap sensor 10, the contact between the fixed bodies 3, 8 and the sleeve 5 may be measured externally.

    In this embodiment, the permanent magnets 3a, 8a, 5b, 5c are provided as in the fourth reference example, and the positions of the permanent magnets 3a, 8a can be adjusted by both the fixed bodies 3, 8. The position of only one of the fixed bodies 3 and 8 may be adjusted.

<Second Embodiment>
FIG. 10 is a diagram showing a configuration of the second exemplary embodiment of the present invention.
As in the second reference example, the artificial heart pump according to the second embodiment has a configuration in which the permanent magnets 5c and 3a are omitted from the configuration of the artificial heart pump in FIG. The configuration that can be adjusted by the lot 12 is configured to be only the fixed body 8 side.

<Third Embodiment>
FIG. 11 is a diagram showing the configuration of the third exemplary embodiment of the present invention.
As in the third reference example, the artificial heart pump according to the third embodiment has a magnetic body instead of the permanent magnets 3a, 8a, 5b, and 5c having the configuration of the artificial heart pump shown in FIG. 3c, and the configuration that can be adjusted by the adjustment lot 12 is configured so that the position of the magnetic body 3c is adjusted only on the fixed body 3 side.

  Further, in the fourth reference example and the first embodiment, similarly to the first reference example, the protrusions 3b and 8b are formed on the fixed bodies 3 and 8 at the connection portions between the fixed bodies 3 and 8 and the fixed shaft 8, respectively. In addition, the holes 4 a and 4 b may be provided in the fixed shaft 4, and the adjustment ring 9 may be mounted on the protrusions 3 b and 8 b of the fixed bodies 3 and 8. Further, as shown in FIG. 5, the fixing bodies 3 and 8 are provided with holes 3d and 8c, the fixing shaft 4 is provided with projections 4c and 4d, and the adjustment ring 9 is attached to the projections 4c and 4d of the fixing shaft 4. It does not matter if it is worn. In this way, the distance between the fixed bodies 3 and 8 can be adjusted using the adjustment ring 9.

  Furthermore, in the first to fourth reference examples and the first embodiment, as in the cited document 1, the front end surface 3x of the fixed body 3 and the rear end surface 8x of the fixed body 8 are respectively spirally shaped as shown in FIG. A plurality of the thrust dynamic pressure generating grooves 100 may be formed. That is, a thrust dynamic pressure is generated in the blood flowing in the thrust dynamic pressure generating groove 100, and the thrust load applied to the sleeve 5 is supported together with the magnetic repulsive force by the permanent magnets 3a, 5b, 5c, 8a.

  In order to secure a wide operating range for the artificial heart pump, the gap between the sleeve 5 and one of the fixed bodies 3 and 8 may be narrowed. Only a fixed body that becomes narrow may be configured as a dynamic pressure bearing with a thrust dynamic pressure generating groove 100 as shown in FIG. That is, for example, as shown in FIG. 13, when the gap between the sleeve 5 and the fixed body 8 is widened and the gap between the sleeve 5 and the fixed body 3 is narrowed, in order to prevent contact between the fixed body 3 and the sleeve 5. A thrust dynamic pressure generating groove 100 as shown in FIG. 12 is formed only on the front end surface 3x of the fixed body 3. On the contrary, when the gap between the sleeve 5 and the fixed body 3 is widened and the gap between the sleeve 5 and the fixed body 8 is narrowed, the fixed body 8 is prevented in order to prevent contact between the fixed body 8 and the sleeve 5. A thrust dynamic pressure generating groove 100 as shown in FIG. 12 is formed only on the front end face 8x.

  Further, in the artificial heart pump configured in each of the reference examples and the embodiments described above, the hardness of the material constituting the rotating member that is rotationally driven like the sleeve 5, and the fixed bodies 3 and 8 and the fixed shaft 4 The material of the fixing member fixed to the housing 1 may be different in hardness. That is, for example, the material constituting the rotating member may be a carbonitrided titanium alloy, and the material constituting the fixing member may be an untreated titanium alloy. Conversely, the material constituting the rotating member may be untreated. The material constituting the fixing member may be carbonitrided titanium alloy. Carbonitriding refers to heating the treated product in a gas atmosphere in which ammonia (NH3) is added to a carburizing gas generated by dripping a modified carburizing gas or liquid such as natural gas, city gas, propane, or butane gas. Carburizing is performed.

  Thus, since the fixing member and the rotating member are made of materials having different hardnesses, seizure at the time of contact can be prevented, and the sliding characteristics can be kept good. In addition, by using titanium alloy as the material used for each part, not only compensates for its biocompatibility, but also produces titanium alloys with different hardness by processing by carbonitriding, so that the temperature atmosphere during processing The thermal deformation of the member to be processed can be suppressed.

These are sectional drawings which show the structure of the 1st reference example of the artificial heart pump to which this invention is applied. These are sectional drawings which show the structure of the 2nd reference example of the artificial heart pump to which this invention is applied. These are sectional drawings which show the structure of the 3rd reference example of the artificial heart pump to which this invention is applied. These are figures which show another structure of the baffle plate and diffuser in the artificial heart pump of a 1st-3rd reference example. These are figures which show another structure of the fixed body and fixed axis | shaft in the artificial heart pump of a 1st-3rd reference example. These are sectional drawings which show the structure of the 4th reference example of the artificial heart pump to which this invention is applied. These are sectional drawings which show another structure of the 4th reference example of the artificial heart pump to which this invention is applied. These are sectional drawings which show another structure of the 4th reference example of the artificial heart pump to which this invention is applied. These are sectional drawings which show the structure of the artificial heart pump of 1st Embodiment applied to the 1st reference example. These are sectional drawings which show the structure of the artificial heart pump of 2nd Embodiment applied to the 2nd reference example. These are sectional drawings which show the structure of the artificial heart pump of 3rd Embodiment applied to the 3rd reference example. These are figures which show the structure of a thrust dynamic pressure generating groove. These are figures which show the structure of the artificial heart pump when installing a thrust dynamic pressure generating groove in the fixed body on the rear side. These are sectional drawings which show the structure of the conventional artificial heart pump using a pivot bearing. These are sectional drawings which show the structure of the conventional artificial heart pump using an active magnetic bearing. These are sectional drawings which show the structure of the conventional artificial heart pump using a dynamic pressure bearing. These are sectional drawings which show the structure of the conventional artificial heart pump using a passive type repulsive magnetic bearing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing 2 Diffuser 3 Fixed body 4 Fixed shaft 5 Sleeve 6 Impeller 7 Current plate 8 Fixed body 9 Adjustment ring 10 Gap sensor 11 Spacer 12 Adjustment lot

Claims (8)

A housing, a fixed shaft fixed at a central position in the housing, two fixed bodies connected to the housing and connected to both ends of the fixed shaft, and a sleeve fitted to the fixed shaft, A plurality of impellers projecting from an outer wall surface of the sleeve; a motor stator included in a position surrounding the sleeve in the housing and generating a rotating magnetic field; and an outer wall surface of the sleeve included in the sleeve An artificial heart pump comprising an anisotropic permanent magnet that generates a magnetic field perpendicular to
A first magnetic field generation unit that generates a magnetic field that is included in the vicinity of a connection portion side of at least one of the fixed bodies with the fixed shaft and that prevents contact with the sleeve;
A second magnetic field generator included in the sleeve and generating a magnetic field that reacts with the first magnetic field generator to prevent contact with the fixed body;
An adjustment unit that adjusts the magnetic force generated by the first and second magnetic field generation units by adjusting the distance between the first and second magnetic field generation units;
With
The adjustment unit is a component that moves and sets an installation position of the first magnetic field generation unit in the fixed body in a direction parallel to the axial direction of the fixed shaft,
By adjusting the installation position of the first magnetic field generator with the component, the distance between the first and second magnetic field generators is adjusted,
The fixed body includes a first part having an opening into which the first magnetic field generating part is inserted, and a cylinder that covers the opening of the first part and has a hole penetrating in the axial direction of the fixed shaft. A second part having a shape, and a third part that covers the hole penetrating the second part by being connected to the second part,
The adjustment part component is inserted from the end opposite to the fixed shaft side with respect to the hole of the second component while the first magnetic field generating unit is installed at the fixed shaft side end, The part inserted into the hole of the second part is an adjustment lot having a screw shape
The length of the adjustment lot inserted from the fixed shaft side into the hole of the second part is adjusted by the tool inserted into the hole of the second part from the side covered by the third part, An artificial heart pump characterized in that a distance between the first and second magnetic field generators is adjusted. The adjustment unit is a component installed between the fixed shaft and the fixed body,
2. The distance between the first and second magnetic field generation units is adjusted by adjusting a distance between opposing end surfaces of the fixed shaft and the fixed body by the component. Artificial heart pump. The fixed body includes a protruding portion protruding toward the fixed shaft at a center position of a connection portion with the fixed shaft,
The fixed shaft includes a hole into which the protruding portion of the fixed body is inserted;
The adjustment part has a ring shape around the protrusion, and the distance between the first and second magnetic field generators is adjusted according to the number of parts around the protrusion. The artificial heart pump according to claim 2, wherein The fixed shaft includes a protruding portion protruding toward the fixed body at a center position of a connection portion with the fixed body;
The fixed body includes a hole into which a protruding portion of the fixed shaft is inserted;
The adjustment part has a ring shape around the protrusion, and the distance between the first and second magnetic field generators is adjusted according to the number of parts around the protrusion. The artificial heart pump according to claim 2, wherein   5. The thrust dynamic pressure groove for generating dynamic pressure when fluid flows in is formed on an end surface of the fixed body facing the sleeve. 6. The artificial heart pump described in 1.   The artificial heart pump according to any one of claims 1 to 5, further comprising a gap sensor that measures a distance from an end surface of the sleeve in the fixed body.   The artificial heart pump according to any one of claims 1 to 6, wherein the first and second magnetic field generating units are permanent magnets that generate repulsive magnetic force by facing the same pole.   The material constituting the fixing member including the fixed body and the fixed shaft and the material constituting the rotating member including the sleeve are materials having different hardnesses. The artificial heart pump according to claim 1.

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