JP3730304B2 - Centrifugal blood pump device - Google Patents

Centrifugal blood pump device Download PDF

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Publication number
JP3730304B2
JP3730304B2 JP03885196A JP3885196A JP3730304B2 JP 3730304 B2 JP3730304 B2 JP 3730304B2 JP 03885196 A JP03885196 A JP 03885196A JP 3885196 A JP3885196 A JP 3885196A JP 3730304 B2 JP3730304 B2 JP 3730304B2
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JP
Japan
Prior art keywords
impeller
blood pump
blood
magnetic bearing
unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
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JP03885196A
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Japanese (ja)
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JPH09206373A (en
Inventor
嗣人 中関
利彦 野尻
Original Assignee
Ntn株式会社
テルモ株式会社
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Priority to JP03885196A priority Critical patent/JP3730304B2/en
Priority claimed from US08/791,560 external-priority patent/US5947703A/en
Publication of JPH09206373A publication Critical patent/JPH09206373A/en
Application granted granted Critical
Publication of JP3730304B2 publication Critical patent/JP3730304B2/en
Anticipated expiration legal-status Critical
Application status is Expired - Fee Related legal-status Critical

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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a magnetic bearing type centrifugal pump device for transporting blood.
[0002]
[Prior art]
As a magnetic bearing type pump device for transporting biological fluids such as blood and plasma, those disclosed in Japanese Patent Publication No. 3-70500 and Japanese Patent Publication No. 7-51955 are known. These are magnetic bearing type centrifugal or axial flow turbo pumps that rotate in a state where the impeller is not in contact with other components at all by controlling the position of the magnetic member constituting the impeller by a magnetic force such as an electromagnet, An impeller position control unit (in other words, a controlled magnetic bearing component) including an electromagnet, a position sensor, and the like, and an impeller rotational torque generating unit (in other words, a non-control type magnetic bearing component) are integrated with the pump housing. It has become.
[0003]
[Problems to be solved by the invention]
In transporting blood, it is necessary not to destroy blood cell components such as red blood cells and platelets, and to prevent blood from coagulating due to a foreign body reaction or the like. A magnetic bearing blood pump device that does not have a friction interface on the blood contact surface is very advantageous in this respect, and is regarded as a promising blood pump for long-term use on a monthly basis. However, since these blood pump devices are integrated, including members such as electromagnets and sensors, they are expensive as disposable blood pumps for open heart surgery that can be completed in a few hours or for short-term use of several days. In addition, because the inside comes into contact with blood, it is difficult to reuse due to infection and the like, and everything must be discarded. However, such a used medical device is an industrial waste, and it is desirable that the used medical device is as small as possible in view of its disposal.
[0004]
Accordingly, an object of the present invention is to easily discard only a blood pump portion that is difficult to reuse in a centrifugal blood pump, and to provide a control type magnetic bearing component (impeller position control unit) and a non-control type for the blood pump. It is an object of the present invention to provide a centrifugal blood pump device that can reuse a magnetic bearing component (impeller rotational torque generator) and reduce the generation of industrial waste of medical instruments.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, a housing having a blood inflow port and a blood outflow port, a centrifugal blood pump having an impeller that rotates in the housing and feeds blood by centrifugal force at the time of rotation, and the impeller A non-controllable magnetic bearing component for the impeller and a controllable magnetic bearing component for the impeller, and the impeller is moved into the housing by the action of the non-controllable magnetic bearing component and the controllable magnetic bearing component. The blood pump device that rotates while being held at a predetermined position, wherein the non-controllable magnetic bearing component and the controllable magnetic bearing component are detachable from the blood pump. The control type magnetic bearing component is an impeller position control unit including a fixed electromagnet for attracting the magnetic member of the impeller and a position sensor for detecting the position of the magnetic member of the impeller. Furthermore, the impeller position control unit has a cutout portion into which the blood inflow port can be inserted from the side to the center of the unit, and the blood inflow port has an annular rib and a port below the rib. Is a polygonal cylinder, and the inner surface of the closed part of the notch is a semi-polygonal column corresponding to the port shape below the annular rib of the blood inlet port It is a centrifugal blood pump device.
[0006]
The impeller includes, for example, a magnetic member provided on one surface side and a permanent magnet provided on the other surface side. Further, the non-control type magnetic bearing component is, for example, an impeller rotational torque generating unit including a rotor having a permanent magnet for attracting the permanent magnet of the impeller and a motor for rotating the rotor. Further, the non-control type magnetic bearing component is, for example, an impeller rotational torque generating unit including a plurality of stator coils for rotationally driving while attracting the permanent magnet of the impeller.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a cross-sectional view of an embodiment of a centrifugal blood pump device of the present invention. FIG. 2 is a plan view of the centrifugal blood pump apparatus of the present invention shown in FIG. FIG. 3 is a cross-sectional view of the centrifugal blood pump device shown in FIG. 1 cut in the vicinity of the center of the blood pump portion. 4 is a cross-sectional view showing a state in which the blood pump device of the present invention shown in FIG. 1 is disassembled.
[0009]
The centrifugal blood pump device 1 according to the present invention includes a pump housing 20 having a blood inflow port 21 and a blood outflow port 22, and a centrifuge having an impeller 23 that rotates in the housing 20 and feeds blood by centrifugal force during rotation. Blood pump 2, non-control type magnetic bearing component 4 for impeller 23, and control type magnetic bearing component 3 for impeller 23, including non-control type magnetic bearing component 4 and control type magnetic bearing The blood pump device 1 rotates in a state where the impeller 23 is held at a predetermined position in the housing 20 by the action of the component 3. The uncontrolled magnetic bearing component 4 and the controlled magnetic bearing component 3 are detachable from the blood pump 2.
In other words, the centrifugal blood pump apparatus 1 includes a blood pump 2, an impeller position control unit 3 that is a control type magnetic bearing component, and an impeller rotational torque generation unit 4 that is a non-control type magnetic bearing component. 3 and 4 can be attached to and detached from the blood pump 2.
[0010]
This will be described in detail with reference to the drawings.
The centrifugal blood pump device 1 of the embodiment shown in FIGS. 1 to 4 includes a blood pump 2, an impeller position control unit 3, a fixing member 5 for fixing the impeller position control unit 3 to the blood pump 2, and generation of impeller rotational torque. A unit 4 is provided.
[0011]
The blood pump 2 includes a blood inflow port 21 and a blood outflow port 22, and includes a pump housing 20 made of a nonmagnetic material and an impeller 23 housed in the housing. On the side surface near the center of the blood inflow port 21, a screw thread 20 a for screwing with the screw groove 5 a of the fixing member 5 is formed. The blood inflow port 21 is provided so as to protrude substantially vertically from the vicinity of the center of the upper surface of the housing 20 formed in a substantially disc shape. The blood outflow port 22 is provided so as to protrude in a tangential direction from the side surface of the housing 20 formed in a substantially disc shape. In addition, a disc-shaped protrusion 20 b for mounting on the impeller rotational torque generating unit 4 is formed at the lower end of the housing 20.
[0012]
The impeller 23 is formed in a disk shape, and includes a magnetic member 26 provided on one surface (a blood inflow port side surface, an upper surface side) and a permanent magnet 27 provided on the other surface (lower surface side). Prepare. The magnetic member 26 is provided for attracting the impeller to the blood inflow port side by an electromagnet 33 of the impeller position control unit 3 described later. The permanent magnet 27 is provided so that rotational torque can be transmitted while attracting the impeller to the side opposite to the blood inflow port by a permanent magnet 41b provided on the rotor 41 of the impeller rotational torque generating unit 4 described later. The impeller position control unit 3 and the impeller rotational torque generating unit 4 constitute a non-contact type magnetic bearing, and the impeller 23 is pulled in an opposite direction, so that the impeller 23 is placed in an appropriate position in the housing 20 so as not to contact the inner surface of the housing. Rotate in the housing in a non-contact state. As the magnetic member 26, magnetic stainless steel, nickel, a soft iron member, or the like is used. A plurality of magnetic members 26 may be provided at equal angular intervals, or may be in the shape of a donut plate. A plurality of the permanent magnets 27 may be provided near the bottom surface of the impeller 23 at equal angular intervals, or a donut plate-like one that has been subjected to multipolar magnetization may be used.
[0013]
As shown in FIGS. 3 and 2, the impeller 23 has an opening 24 formed near the center of the impeller at a position corresponding to the blood inflow port 21, and the impeller is curved in a tangential direction from the peripheral edge of the opening 24. A plurality of partition portions 25 extending to the peripheral edge are provided. The impeller 23 includes a plurality of blood guide paths 28 that are formed between the adjacent partition portions 25 and communicate with the blood inlet port 21 and the blood passage 29 of the housing 20.
[0014]
As shown in FIGS. 1 and 3, the impeller position control unit 3 includes a housing 31, a plurality of electromagnets 33 housed in the housing, and a plurality of position sensors 32. The housing 31 has an opening 31a through which the blood inflow port 21 protruding substantially perpendicularly to the housing 20 of the blood pump 2 can pass. For this reason, the unit 3 can be attached (fitted) to and removed from the upper surface of the pump from above the blood pump 2. In a state where the unit 3 is mounted on the pump 2, the screw thread 20 a of the housing 20 of the pump 2 is located near the upper end of the unit 3, and is a plate-like (specifically, polygonal plate-like) fixing member 5. The unit 3 is sandwiched and fixed between the fixing member 5 and the pump 2 by screwing the screw groove 5a formed in the opening 51 of the screw 5a with the screw thread 20a. Conversely, the unit 3 can be detached from the pump 2 by removing the fixing member 5.
[0015]
The plural (three) electromagnets 33 and the plural (three) position sensors 32 of the unit 3 are provided at equal angular intervals, and the electromagnet 33 and the position sensor 32 are also provided at equal angular intervals. . The electromagnet 33 includes an iron core 33a and a coil 33b. The lower end of the iron core 33 a and the lower end of the sensor 32 are exposed on the lower surface of the housing 31. In this embodiment, three electromagnets 33 are provided as shown in FIG. Three or more electromagnets may be used. Three or more are provided, and these electromagnetic forces are adjusted using detection results of a position sensor 32 described later, thereby balancing the forces in the central axis (z-axis) direction of the impeller and orthogonal to the central axis (z-axis). The moment around the x axis and the y axis can be made zero.
[0016]
The position sensor 32 detects the gap interval between the electromagnet 33 and the magnetic member 26, and this detection output is fed back to a control unit (not shown) that controls the current applied to the coil 33b of the electromagnet. Even if a radial force due to gravity or the like acts on the impeller 23, the magnetic flux shear force between the permanent magnet 27 of the impeller 23 and the permanent magnet 41 b of the rotor 41 and the force between the electromagnet 33 and the magnetic member 26. Since the shearing force of the magnetic flux acts, the impeller 23 is held at the center of the housing 2.
[0017]
As shown in FIGS. 1 and 4, the impeller rotational torque generating unit 4 includes a housing 40 and an impeller rotational torque generating mechanism housed in the housing. The upper end portion of the housing 40 is provided with a disk-shaped recess 40 a that houses (engages) the lower end protruding portion 20 b of the blood pump 2. The unit 4 is attached to the blood pump 2 by the engagement between the lower end protrusion 20b of the blood pump 2 and the recess 40a. Further, the unit 4 can be easily detached from the blood pump 2 by releasing the engagement between the two.
[0018]
The impeller rotational torque generating mechanism includes a rotor 41 and a motor 42 for rotating the rotor (the internal structure is omitted). The rotor 41 includes a rotating plate 41a and a plurality of permanent magnets 41b provided on one surface (the surface on the blood pump side) of the rotating plate. The center of the rotor 41 is fixed to the rotating shaft of the motor 42. The permanent magnets 41b are provided in plural and at equal angles so as to correspond to the arrangement form (number and arrangement position) of the permanent magnets of the impeller 23.
[0019]
Next, the blood pump device 10 of the embodiment shown in FIGS. 5 to 7 will be described. The basic configuration of the blood pump device 10 of this embodiment is the same as that of the blood pump device 1 shown in FIG. Only the differences will be described below.
The impeller position control unit 52 has a structure that can be divided into a plurality (specifically, two). The unit 52 can be divided into a unit first division part 53 and a unit second division part 54, each of which is substantially semicircular, and both can be opened and closed by a hinge member 56 fixed to the end. The semicircular straight portion is fixed and forms a contact surface. Note that the state of FIG. 7 is an open state (or a divided state), and the state of FIG. 6 is a closed state (or an assembled state). As shown in FIGS. 6 and 7, the end of the second unit dividing portion 54 includes a screw member 55 for unit assembly and a screw member mounting portion 54b having a screw groove corresponding to the thread of the screw member 55. A screw member mounting portion 53b having a thread groove corresponding to the thread of the screw member 55 is provided at a portion that contacts the screw member mounting portion 54b during assembly. It has been.
[0020]
Therefore, as shown in FIG. 6, the unit first divided portion 53 and the unit second divided portion 54 are held by the screw member 55 so as not to be opened. Further, as shown in FIG. 7, a blood inflow port accommodating recess 53a is provided at the center of the straight portion of the unit first dividing portion 53, and a protrusion 53d and a recess 53e are provided at the end of the straight portion. At the center of the straight portion of the unit second dividing portion 54, a concave portion 54a for storing a blood inflow port is provided, and at the end of the straight portion, a concave portion 54d corresponding to the protrusion 53d of the unit first dividing portion 53 and Protrusions 54e corresponding to the concave portions 53e of the one divided portion 53 are provided, thereby making it easy and reliable to assemble the divided units. In addition, since the assembled unit is distributed among the divided units of the four position detection sensors 32 and the four electromagnets 33, wiring cables 53f and 54f are provided in each of the divided units. ing.
[0021]
According to these embodiments, since the impeller position control unit arranged on the blood inlet side of the pump housing can be divided, it is easier to mount and remove the unit from the pump housing. In particular, even when an impeller position control unit malfunctions during use, only the unit can be replaced without removing the blood pump from the extracorporeal circuit.
An annular rib 20b is provided near the center of the blood inlet port 21 of the blood pump 2 to prevent the assembled unit 52 from being detached from the blood pump.
[0022]
The impeller position control unit may be configured as shown in FIG. The basic configuration of the unit 62 is the same as that of the unit 52 described above, and the difference is that the protrusion 62a provided at the end of the straight portion of the unit first divided portion 53 and the unit second divided portion 54 and the projection 62a correspond thereto. One or both of the concave portion 62c or the concave portion 62b and the corresponding projection 62d are used as a pin and a receiving portion having an electrical connector function, and an electric signal in the unit second divided portion 54 is transmitted into the unit first divided portion 53. The wiring in the two divided units is the only wiring cable 62e.
According to this embodiment, since electrical wiring is possible only from one of the divided impeller position control units, the number of parts such as external wiring cords can be reduced.
[0023]
Further, the impeller position control unit may be configured as shown in FIG. The basic configuration of the unit 65 is the same as that of the unit 52 described above, and the difference is that the assembled unit 65 includes three position detection sensors 32 and three electromagnets 33. And in the unit 2nd division | segmentation part 54, it arrange | positions so that it may be in the state by which the three position detection sensors 32 and the three electromagnets 33 are each arrange | positioned for every equal angle in the assembled state.
[0024]
Next, the blood pump device of the embodiment shown in FIG. 10 will be described.
FIG. 10 shows only the impeller position control unit 70 used in the blood pump device of this embodiment and the vicinity of the blood inlet port of the blood pump.
As shown in the left diagram of FIG. 10, the unit 70 has a notch 72 through which the blood inflow port can be inserted from the side to the center of the unit. As shown in the right view of FIG. 10, the blood inflow port 21 has an annular rib 20b near the center, and the port 21 below the rib 20b has a polygonal cylinder shape (specifically, an octagonal column shape). ing. The inner side surface of the closed portion of the notch 72 has a semi-polygonal column shape corresponding to the shape of the port 21 below the ring-shaped rib 20b. The unit 70 attached to the blood pump is restricted from rotating with respect to the pump by the engagement of the inner surface of the closed portion of the notch 72 and the side surface of the port 21 below the ring-shaped rib 20b. The separation from the pump is also regulated by 20b.
[0025]
And in the unit, As shown in FIG. On the part excluding the notch 4 Two position detection sensors 32 and To be equiangularly spaced Three electromagnets 33 are arranged. Also, as shown in FIG. 5 Two position detection sensors 32 and To be equiangularly spaced Four electromagnets 33 The You may arrange. Also in these embodiments, even if the impeller position control unit malfunctions during use, only the unit can be replaced without removing the blood pump from the extracorporeal circuit. Furthermore, according to these embodiments, the impeller position control unit can be mounted simply by sliding it from the side of the blood inlet port, and can be easily attached and detached.
[0026]
Next, the blood pump device 80 of the embodiment shown in FIG. 12 will be described.
The blood pump device 80 includes a blood pump 82, an impeller position control unit 83, an impeller rotation torque generation unit 84, and a fixing member 86 for fixing the impeller rotation torque generation unit 84 to the blood pump 82.
The blood pump 82 is the same as the blood pump shown in FIGS. 1 to 4 except that the position of the thread 82b provided on the side surface of the blood inflow port 21 is slightly on the blood inlet side. Briefly, the pump housing 82a is provided with a blood inflow port 21 and a blood outflow port (not shown) and is made of a nonmagnetic material, and an impeller 23 housed in the housing. On the side surface slightly below the blood inlet of the blood inflow port 21, a screw thread 82 b for screwing with the screw groove 86 b of the fixing member 86 is formed. The blood inflow port 21 is provided so as to protrude substantially vertically from the vicinity of the center of the upper surface of the housing 82a formed in a substantially disc shape. The blood outflow port is provided so as to protrude in a tangential direction from the side surface of the housing formed in a substantially disc shape. In addition, a disc-shaped protrusion 82c for mounting the impeller position control unit 83 is formed at the lower end of the housing 82a. The impeller 23 is the same as that described above.
[0027]
The impeller position control unit 83 is not provided with an opening penetrating the blood inflow port, and includes a disk-shaped recess 83b that engages with a disk-shaped protrusion 82c provided at the lower end of the blood pump housing 82a. It is the same as the impeller position control unit 3 shown in FIGS. 1 to 4 and includes a plurality of electromagnets 33 and a position sensor 32.
[0028]
The impeller rotational torque generation unit 84 includes a housing 84a and an impeller rotational torque generation mechanism housed in the housing. The housing 84a has an opening 84b through which the blood inflow port 21 protruding substantially perpendicularly to the housing 82a of the blood pump 82 can pass. For this reason, the unit 84 can be attached (fitted) to and removed from the upper surface of the pump from above the blood pump 82. In a state where the unit 84 is mounted on the pump 82, the screw thread 82b of the housing of the pump 82 is located near the upper end of the unit 84, and the plate-like (specifically, polygonal plate-like) fixing member 86 is located. The unit 84 is sandwiched and fixed between the fixing member 86 and the pump 82 by screwing the thread groove 86b formed in the opening 86a with the thread 82b. Conversely, by removing the fixing member 86, the unit can be detached from the pump.
[0029]
The impeller rotational torque generating mechanism 85 includes a cylindrical rotor 85b, a rotor magnet 85c, and a stator coil 85d. A flange is formed at one end of the rotor 85b, and a plurality of permanent magnets 85a are provided on the surface of the flange (the surface on the blood pump side). The permanent magnets 85a are provided at a plurality of equal angles so as to correspond to the arrangement form (number and arrangement position) of the permanent magnets 27 of the impeller 23.
[0030]
Next, the blood pump device 90 of the embodiment shown in FIG. 14 will be described.
FIG. 13 shows an impeller rotational torque generation unit 91 used in the blood pump device 90.
The blood pump device 90 includes a blood pump 96, an impeller position control unit 83, and an impeller rotational torque generation unit 91.
[0031]
The blood pump 96 is not the thread 82b provided on the side surface of the blood inflow port 21, but an annular rib 96b and the position thereof is slightly below. It is the same, and prevents the impeller rotational torque generating unit 91 assembled and mounted from being detached from the blood pump. The impeller 23 is the same as that described above. Further, the impeller position control unit 83 is the same as that in FIG.
[0032]
The impeller rotational torque generating unit 91 is an impeller rotational torque generating unit that includes a plurality of stator coils 94 for rotationally driving while attracting the permanent magnets of the impeller. By using such a flat type brushless motor mechanism, the impeller rotational torque generating unit 91 is rotated. The movable member in the torque generating unit is excluded, and the structure is physically separable. Thereby, as shown in FIG. 13, the unit 91 has a structure that can be divided into a plurality (specifically, two). The unit 91 can be divided into a unit first division unit 92 and a unit second division unit 93, each of which is substantially semicircular, and both can be opened and closed by a hinge member 56 fixed to the end. The semicircular straight portion is fixed and forms a contact surface. Note that the state of FIG. 13 shows an open state (or a divided state).
[0033]
Further, as shown in FIG. 13, a central portion of the straight portion of the unit first division portion 92 has a concave portion 92 a for storing a blood inflow port. In the center of the straight line portion of the unit second divided portion 93, there is a concave portion 93a for storing a blood inflow port. Furthermore, a screw member 95 for unit assembly and a screw member attachment portion 93 b having a screw groove corresponding to the thread of the screw member 95 are provided at the end of the second unit dividing portion 93, and the unit first dividing portion 92 is provided. A screw member mounting portion 92b having a thread groove corresponding to the thread of the screw member 95 is provided at a portion that is in contact with the screw member mounting portion 93b during assembly. Therefore, the unit first division part 92 and the unit second division part 93 are held by the screw member 95 so as not to be opened.
[0034]
According to this embodiment, since the impeller rotational torque generating unit arranged on the inlet side of the pump housing can be divided, it is easier to mount and remove the unit from the pump housing. In particular, even if the impeller rotational torque generating unit malfunctions during use, only the unit can be replaced without removing the blood pump from the extracorporeal circuit.
[0035]
Next, the blood pump device 100 of the present invention shown in FIGS. 15 and 16 will be described.
The basic configuration of the blood pump device 100 of this embodiment is the same as that of the blood pump device 1 shown in FIGS. 1 to 4, and the only difference is the shape of the contact portion between the impeller position control unit 3 and the blood pump 2. It is. In the unit 3 of the blood pump device 100, the lower end portions 33 c of the plural (three) electromagnets 33 and the lower end portions 32 a of the plural (three) position sensors 32 protrude from the lower surface of the housing 31. Correspondingly, the upper surface of the blood pump 2 has a recess 20c for storing the lower end 33c (the lower end of the iron core) from which the electromagnet 33 protrudes and a recess 20d for storing the lower end 32a from which the position sensor 32 protrudes. By providing such a protrusion and a recess for storing the protrusion, rattling of the unit 3 installed in the blood pump can be prevented. Furthermore, the distance between the lower end of the iron core of the electromagnet and the magnetic member of the impeller can be shortened, and the magnetic attraction of the impeller by the electromagnet can be performed more reliably.
[0036]
In the above-described embodiments, the impeller position control unit and the torque generation unit are fixed to the pump housing, and the separable impeller position control unit and the torque generation unit are coupled using a screw connection or a hinge member. However, the present invention is not limited thereto, and other known means such as a latch mechanism may be used.
[0037]
【The invention's effect】
The centrifugal blood pump device of the present invention includes a housing having a blood inflow port and a blood outflow port, a centrifugal blood pump having an impeller that rotates in the housing and feeds blood by centrifugal force during rotation, A non-controllable magnetic bearing component for the impeller and a controllable magnetic bearing component for the impeller, and the impeller is moved by the action of the non-controllable magnetic bearing component and the controllable magnetic bearing component. The blood pump device rotates while being held at a predetermined position in the housing, and the non-controllable magnetic bearing component and the controllable magnetic bearing component are detachable from the blood pump.
[0038]
In this centrifugal blood pump device, since the impeller can effectively rotate in a non-contact state and can send blood, the influence on blood cell components, specifically, damage to red blood cells and platelets is less likely to occur. After use, only the blood pump part can be discarded, and the control type magnetic bearing component (impeller position control unit) and the non-control type magnetic bearing component (impeller rotational torque generation unit) for the blood pump can be reused. The generation of industrial waste of equipment can be reduced.
[0039]
Furthermore, it is preferable that the unit (unit) mounted on the blood inlet side of the blood pump among the impeller position control unit or the impeller rotational torque generation unit has a structure that can be divided into a plurality of parts. If the impeller position control unit or impeller rotational torque generation unit malfunctions during use, it is not necessary to perform the extremely complicated work of removing the blood pump from the extracorporeal circuit filled with blood, making it easy to perform the malfunctioning unit. Can be replaced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an embodiment of a centrifugal blood pump apparatus according to the present invention.
FIG. 2 is a plan view of the centrifugal blood pump device of the present invention shown in FIG.
FIG. 3 is a cross-sectional view of the centrifugal blood pump device shown in FIG. 1 cut in the vicinity of the center of the blood pump portion.
4 is a cross-sectional view showing a state where the blood pump device of the present invention shown in FIG. 1 is disassembled. FIG.
FIG. 5 is a cross-sectional view of another embodiment of the centrifugal blood pump device of the present invention.
6 is a plan view of the centrifugal blood pump device of the present invention shown in FIG.
7 is a plan view showing a divided state of an impeller position control unit used in the centrifugal blood pump apparatus shown in FIG. 6. FIG.
FIG. 8 is a plan view showing a divided state of another example of the impeller position control unit used in the centrifugal blood pump device of the present invention.
FIG. 9 is a plan view showing an assembled state of another example of the impeller position control unit used in the centrifugal blood pump device of the present invention.
FIG. 10 is a plan view of another example of an impeller position control unit used in the centrifugal blood pump device of the present invention and an explanatory view showing the vicinity of a blood inlet port of the blood pump in which the unit of this example is used. is there.
FIG. 11 is a plan view of another example of the impeller position control unit used in the centrifugal blood pump apparatus of the present invention and an explanatory diagram showing the vicinity of the blood inlet port of the blood pump in which the unit of this example is used. is there.
FIG. 12 is a cross-sectional view showing an exploded state of a centrifugal blood pump device according to another embodiment of the present invention.
FIG. 13 is a plan view showing a divided state of an example of an impeller rotational torque generating unit used in the centrifugal blood pump device of the present invention.
FIG. 14 is a cross-sectional view showing an exploded state of a centrifugal blood pump apparatus according to another embodiment of the present invention.
FIG. 15 is a cross-sectional view of another embodiment of the centrifugal blood pump apparatus of the present invention.
16 is a plan view of the centrifugal blood pump device of the present invention shown in FIG.
[Explanation of symbols]
1 Centrifugal blood pump device
2 Centrifugal blood pump
3 Control type magnetic bearing components (impeller position control unit)
4 Non-control type magnetic bearing component (impeller rotational torque generation unit)
5 Fixing member
21 Blood inflow port
22 Blood outflow port
23 Impeller
26 Magnetic members
27 Permanent magnet of impeller
33 Electromagnet
41 rotor
41b Permanent magnet of rotor

Claims (4)

  1. A housing having a blood inflow port and a blood outflow port, a centrifugal blood pump having an impeller that rotates in the housing and feeds blood by centrifugal force at the time of rotation, and a non-controllable magnetic bearing configuration for the impeller And a controlled magnetic bearing component for the impeller, and the impeller is held at a predetermined position in the housing by the action of the non-controllable magnetic bearing component and the controlled magnetic bearing component The non-controllable magnetic bearing component and the controllable magnetic bearing component are attachable to and detachable from the blood pump, and the controllable magnetic bearing component is magnetized by the impeller. Impeller position control unit comprising a fixed electromagnet for attracting a member and a position sensor for detecting the position of the magnetic member of the impeller And the impeller position control unit has a cutout portion into which the blood inflow port can be inserted from a side surface to almost the center of the unit. The blood inflow port has an annular rib and is below the rib. The port has a polygonal cylindrical shape, and the inner surface of the closed portion of the notch has a semi-polygonal column shape corresponding to the port shape below the annular rib of the blood inflow port. A centrifugal blood pump device characterized by that.
  2.   The centrifugal blood pump device according to claim 1, wherein the impeller includes a magnetic member provided on one surface side and a permanent magnet provided on the other surface side.
  3.   3. The centrifugal control unit according to claim 2, wherein the non-control type magnetic bearing component is an impeller rotational torque generating unit including a rotor including a permanent magnet for attracting the permanent magnet of the impeller and a motor that rotates the rotor. Blood pump device.
  4. The centrifugal blood pump device according to claim 2 or 3 , wherein the non-control type magnetic bearing component is an impeller rotational torque generating unit including a plurality of stator coils for rotationally driving the permanent magnet of the impeller while attracting it. .
JP03885196A 1996-01-31 1996-01-31 Centrifugal blood pump device Expired - Fee Related JP3730304B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP03885196A JP3730304B2 (en) 1996-01-31 1996-01-31 Centrifugal blood pump device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP03885196A JP3730304B2 (en) 1996-01-31 1996-01-31 Centrifugal blood pump device
US08/791,560 US5947703A (en) 1996-01-31 1997-01-31 Centrifugal blood pump assembly

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Publication Number Publication Date
JPH09206373A JPH09206373A (en) 1997-08-12
JP3730304B2 true JP3730304B2 (en) 2006-01-05

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JP03885196A Expired - Fee Related JP3730304B2 (en) 1996-01-31 1996-01-31 Centrifugal blood pump device

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Cited By (1)

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WO2013039144A1 (en) * 2011-09-15 2013-03-21 三菱重工業株式会社 Magnetic coupling pump and pump unit provided with same

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JP4555435B2 (en) * 2000-05-19 2010-09-29 Ntn株式会社 Liquid pump device
US6626644B2 (en) * 2000-10-30 2003-09-30 Ntn Corporation Magnetically levitated pump and controlling circuit
JP4798867B2 (en) * 2001-04-11 2011-10-19 Ntn株式会社 Medical device, its manufacturing method, and central blood pump
WO2007029623A1 (en) * 2005-09-05 2007-03-15 Tokyo Institute Of Technology Disposable magnetic levitation blood pump
US9044535B2 (en) * 2007-08-07 2015-06-02 Terumo Cardiovascular Systems Corp. Extracorporeal blood pump with disposable pump head portion having magnetically levitated impeller

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013039144A1 (en) * 2011-09-15 2013-03-21 三菱重工業株式会社 Magnetic coupling pump and pump unit provided with same
US9145894B2 (en) 2011-09-15 2015-09-29 Mitsubishi Heavy Industries, Ltd. Magnetic coupling pump and pump unit comprising the same

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