JPH0776560B2 - Blood transfer pump - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a blood transfer pump that is preferably used when performing cannulation, and more particularly, to a pump body and a motor for driving the pump body. And the stator of the motor is configured to be substantially separable into at least two parts, and therefore the rotors surrounded by the stator can be easily taken out by separating the respective stators from each other. The present invention relates to a blood transfer pump that enables

BACKGROUND OF THE INVENTION Conventionally, a fluid transfer pump has been widely adopted in which a pump main body and a motor are integrally incorporated and a fluid is transferred by rotating an impeller constituting the pump main body under the driving action of the motor. Has been done. In fact, the motor is basically composed of a rotor rotatably supported on the inner side and a stator surrounding the rotor from the outside. In the axial flow type pump, a fluid passage is defined on the central axis of the rotor.

By the way, in recent years, the fluid transfer pump is being used for medical purposes such as an extracorporeal blood circulation system. In this case, the stator and the rotor of the motor that constitutes the fluid transfer pump (hereinafter referred to as the blood transfer pump) incorporated in the external circulation system are integrally incorporated. It has been pointed out that, due to such an integrated structure, in an extracorporeal blood circulation system using a blood transfer pump, the work of mounting this pump on a patient is complicated. That is, when assembling the extracorporeal blood circulation system, first, a blood transfer tube is connected to the blood transfer pump, and then the tube is connected to a blood vessel or the like of a patient. In this case, the blood contact site needs to be disposable for each patient. As is well known, among the motors constituting the blood transfer pump as an axial flow type pump, in particular, the stator is considerably heavy. Therefore, it is practically impossible to replace the motor main body that constitutes the blood contact portion with the blood conduit connected to another unit in the structure in which the stator and the rotor are integrated as described above. It is possible, and even if it is done intentionally, it is not preferable for patients.

On the other hand, some centrifugal blood pumps have a blood flow path that penetrates the inside of the motor, but in this case as well, the blood contact portion must be disposable for each patient. At that time, in the case where the rotor and the stator are integrated, it is necessary to pass the blood tube through the stator that constitutes the motor, and then insert the cannula into the blood vessel on the patient side. The relatively heavy stator is suspended in the blood circuit, which is likewise unfavorable for the patient.

[Object of the Invention] The present invention has been made in order to overcome the above-mentioned inconvenience, and is composed of a pump main body and a motor, and a rotor constituting the motor has a blood inlet and a blood outlet. On the other hand, a communicating passage is defined, and on the other hand, the stator that constitutes the motor and is disposed on the outside of the motor has a separation structure that can be separated from each other, thereby fixing the pump main body and the rotor of the motor. It is configured to be attachable to and detachable from the child, facilitating the assembly of the blood external circulation system,
Moreover, it does not burden the patient even after being attached to the patient,
It is another object of the present invention to provide a blood transfer pump that allows easy replacement of the rotor or the like that forms the blood contact site.

[Means for Achieving the Object] In order to achieve the above object, the present invention includes a pump main body for transferring blood at a predetermined pressure, a detachable rotor and a detachable rotor and a stator. A motor, wherein the motor is composed of at least two stator blocks fitted onto the rotor, and the stator blocks are adjacently connected to each other via a hinge member so that the rotor blocks can swing. Is characterized in that a passage communicating with the blood inlet and the blood outlet is defined along the axial direction.

[Embodiment] Next, a preferred embodiment of the blood transfer pump according to the present invention will be described below in detail with reference to the accompanying drawings.

In FIG. 1, reference numeral 10 indicates an extracorporeal blood circulation system incorporating a blood transfer pump according to the present invention. The extracorporeal blood circulation system 10 includes tubes 14 and 16 connected to blood vessels of a patient 12, and It basically comprises a blood transfer pump 18 to which the tubes 14 and 16 are connected, and a servo amplifier 20. In this case, the servo amplifier 20 has a cable 22
The servo amplifier 20 is connected to the blood transfer pump 18 via a cable, and one ends of cables 24 and 26 are connected to the servo amplifier 20. The other ends of the cables 24 and 26 are connected to a pressure measuring device and a flow measuring device (not shown) disposed on the tube 16 side, respectively, and the pressure and flow rate of blood measured by these are converted into a signal to output the servo amplifier 20. Have been sent to.

Therefore, as shown in FIGS. 2 to 4, the blood transfer pump 18 is composed of a motor 28 and a pump body 30, and the motor 28 includes a stator unit 32 disposed on the outside. A rotor unit 34 disposed inside the stator unit 32 and fixed to the pump body 30.
The stator unit 32 has a substantially semi-cylindrical stator frame body.
36a and 36b, and the stator frame bodies 36a and 36b are openably and closably engaged with each other via hinges 38a and 38b attached to the outer wall surface portions thereof (see FIG. 3). In this case, the stator frame 36
The a and 36b oscillate in the direction of approaching each other, and when the other ends abut each other, the stator frames 36a and 36b form a substantially cylindrical shape and are attached to the other end. The stoppers 40a and 40b are configured to prevent the stator frames 36a and 36b from being separated from each other.

As shown in FIG. 4, semi-annular recesses 42a and 42b are defined on the inner wall surfaces of the stator frames 36a and 36b, respectively.
Armatures 44a and 44b as stators are engaged and fixed to a and 42b. Further, a substrate 46 is attached to the stator frame 36b, and a magnetic sensor 48 for detecting the rotation speed of the rotor, which will be described later, is attached to the substrate 46. The substrate 46 is electrically connected to the servo amplifier 20 via the cable 22 described above.

Next, the rotor unit 34 is arranged in the stator unit 32. That is, the rotor unit 34 is a housing
A tube 51 is integrally fixed to one end of the housing 50, and a blood inlet 51a is defined by the tube 51. A threaded portion is formed in a part of the tubular body 51, and the nut member 53 is screwed into the threaded portion.
A rotor 52 is rotatably supported inside the housing 50 via a bearing 49 and the like. In this case, the rotor 52 has a plurality of motor magnets as rotors at portions corresponding to the armatures 44a and 44b attached to the stator frames 36a and 36b.
54 is attached, and a magnet 56 is attached to a portion of the stator frame 36b corresponding to the magnetic sensor 48.

Further, the rotor 52 has a passage extending in the axial direction thereof.
58 is defined, and one end side of the passage 58 communicates with a blood introduction port 51a formed by a tube body 51 integrally attached to the housing 50. On the other hand, the other end of the passage 58 communicates with the pump body 30.

That is, the pump body 30 includes a housing 60 integrally fixed to the housing 50.
An impeller 62, which is engaged with the rotor 52 and rotates with the rotation of the rotor 52 under the rotating action of the rotor 52, is provided therein. In this case, the impeller 62 is integrally configured from a disc-shaped side plate 64 and a plurality of blade members 65 attached to the side plate 64 and curved in a radial pattern with respect to the rotation axis of the rotor 52. Has been done.

Further, a lid member 66 is attached to a side surface portion of the housing 60, and a pin member 68 is provided at a substantially central portion of the lid member 66. The pin member 68 abuts on a substantially central portion of the side plate 64 of the impeller 62 and rotatably supports the pin member 68. Furthermore, a tube body 72 defining a blood outlet port 70 communicating with the inside of the housing 60 is attached to the outer peripheral surface of the housing 60.
In this case, the tube 16 is connected to the tube body 72.

The blood transfer pump according to the embodiment of the present invention is basically constructed as described above. Next, its operation and effect will be described.

First, the tube 1 that constitutes the extracorporeal blood circulation system 10
One end sides of 4, 16 are connected to the pipe bodies 51, 72 of the blood transfer pump 18, respectively. Next, the other ends of the tubes 14 and 16 are connected to a predetermined site such as a blood vessel of the patient 12. At that time, the stator unit 32 constituting the blood transfer pump 18 is removed from the rotor unit 34 and the pump body 30 in advance. That is, the nut member 53 screwed to one end side of the rotor unit 34 is rotated in a predetermined direction to be loosened, and a stopper that connects the stator frame bodies 36a and 36b forming the stator unit 32 is connected. The metal fittings 40a and 40b are released. As a result, the stator frames 36a and 36b are hinged to the one ends of the hinges 38a and 3b.
It can be opened around 8b. Therefore, after the stator frames 36a and 36b are swung in the directions away from each other, the stator frames 36a and 36b may be removed from the rotor unit 34 and the pump body 30. As described above, since the tubes 14 and 16 can be attached to the patient 12 in a state where the stator unit 32 having a relatively large weight is separated from the rotor unit 34 and the pump body 30, the blood transfer pump 18 The handling is facilitated, and the work of mounting the tubes 14 and 16 can be performed easily and reliably.

Therefore, as described above, after the tubes 14 and 16 are attached, the stator unit 32 of the blood transfer pump 18 is attached to the rotor unit 34 and the pump body 30. That is, the stator frame members 36a, 3a constituting the stator unit 32.
6b is swung in the opening direction and the stator frame 36
Either one of a and 36b, for example, the stator frame 36a is engaged with the housing 50 of the rotor unit 34, and then the other stator frame 36b is swung in a direction approaching the stator frame 36a. To move. As a result, the rotor unit 34 is surrounded by the stator frames 36a and 36b. Next, the nut member 53 screwed to the rotor unit 34 is rotated and tightened, and the stator frames 36a and 36b are locked by the stoppers 40a and 40b.

With the above work, the extracorporeal blood circulation system 10 is attached to the patient 12, and then the motor is driven by the servo amplifier 20.
An output signal for controlling the rotation speed of 28 is derived, and the electric signal drives the blood transfer pump 18 via the cable 22. That is, from the servo amplifier 20 to the cable 22
The electric signal sent via the stator frame body 36a, 36b
Are fed to the armatures 44a and 44b attached to the. As a result, the rotor 52, which is rotatably arranged in the housing 50 of the rotor unit 34, starts to rotate under the action of the armatures 44a and 44b and the motor magnet 54.
The impeller 62 arranged on the 30 rotates in a predetermined direction. In this case, the blood of the patient 12 is supplied to the pump body 30 via the tube 14, the tube body 51 and the passage 58 formed in the rotor 52. Therefore, the blood is discharged into the tube 16 through the blood outlet 70 by the centrifugal force in the housing 60 under the rotating action of the impeller 62, and eventually is delivered from the tube 16 to the patient 12. Reach At that time, the pressure and flow rate of the blood supplied in the tube 16 are measured by a pressure measuring device and a flow measuring device (not shown), and are sent to the servo amplifier 20 via the cables 24 and 26 to be displayed.

Next, another embodiment of the blood transfer pump will be described. In this embodiment, the same components as those of the first embodiment described above are designated by the same reference numerals, and detailed description thereof will be omitted.

That is, in the blood transfer pump 80 according to this embodiment, as shown in FIG. 5, a passage 82 that penetrates in the axial direction of the rotor 52 that constitutes the motor 28 and that has a swelled intermediate portion is provided. A pump body 84 is provided in the passage 82. The pump main body 84 includes a plurality of vane members 86 arranged in the bulging portion of the passage 82, and the vane members 86 are directed to the central portion of the passage 82. The tip of the shaft is a shaft 88.
The blade member 86 is attached to the rotor 52 with a slight inclination with respect to the axial direction of the passage 82.

With this configuration, when the rotor 52 is rotated in the predetermined direction under the driving action of the motor 28, the blood of the patient 12 fed from the tubular body 19 is fed to the patient 12 by the vane member 86. Will be. Moreover, the stator frame body of the stator unit 32 constituting the blood transfer pump 80 according to this embodiment.
Since 36a and 36b have a divided structure similar to the first embodiment described above, when the blood transfer pump 80 is incorporated into the extracorporeal blood circulation system 10, the extracorporeal circulation system 10 is used.
The work of attaching the tubes 14 and 16 to the patient can be easily performed.

[Advantages of the Invention] As described above, according to the present invention, there is provided a blood transfer pump in which a pump main body and a motor are integrally formed, and a passage is formed in the motor, and a stator of the motor. Is a separate structure of at least two, and the stator can be easily removed from the rotor of the motor and the pump body. Therefore, when assembling the blood external circulation system including the blood transfer pump, the work can be performed with the stator of the motor removed. Therefore, there is an advantage that the assembly work itself can be performed in a state where the blood transfer pump is considerably reduced in weight, and in the end, this kind of work and the like can be performed easily and reliably. Moreover, when the armature and the rotation speed detection circuit or the like assembled in correspondence with the stator fails, it is not necessary to remove the entire blood transfer pump from the blood external circulation system, and only the stator is removed to The armature, the rotation detection circuit, and the like can be repaired, and as a result, the effect of facilitating the maintenance of the blood transfer pump can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view of an extracorporeal blood circulation system incorporating a blood transfer pump according to an embodiment of the present invention. FIG. 2 is a schematic exploded perspective view of a blood transfer pump according to an embodiment of the present invention. 2 is a partially omitted side view of the blood transfer pump shown in FIG. 2, FIG. 4 is a partially omitted sectional explanatory view of the blood transfer pump shown in FIGS. 2 and 3, and FIG. 5 is the present invention. It is a partially omitted cross-sectional explanatory view showing another embodiment of the blood transfer pump. 10 …… Blood extracorporeal circulation system 18 …… Blood transfer pump, 20 …… Servo amplifier 28 …… Motor, 30 …… Pump body 32 …… Stator unit, 34 …… Rotor unit 36a, 36b …… Stator Frame, 44a, 44b ...... Armature 52 ...... Rotor 54 ...... Motor magnet, 62 ...... Impeller

Claims (3)

[Claims] 1. A pump main body for transferring blood at a predetermined pressure, and a motor that is separably formed and includes a detachable rotor and a stator. The motor externally fits the rotor. The stator block is composed of at least two stator blocks, and adjacent stator blocks are swingably connected to each other via a hinge member. The rotor has a shaft communicating with a blood inlet and a blood outlet. A blood transfer pump characterized by being defined along the direction of the heart. 2. The pump according to claim 1, wherein the pump main body is a centrifugal pump that rotates blood through an impeller that rotates under the driving action of a motor and uses the centrifugal force to transfer the blood. A blood transfer pump characterized by the above. 3. The pump according to claim 1, wherein the pump main body is an axial flow pump that transfers blood in a rotation axis direction of the blade member via a blade member that rotates under the driving action of a motor. A blood transfer pump.