WO2012115184A1

WO2012115184A1 - Turbo blood pump and method for producing same

Info

Publication number: WO2012115184A1
Application number: PCT/JP2012/054407
Authority: WO
Inventors: 大森正芳
Original assignee: 株式会社ジェイ・エム・エス
Priority date: 2011-02-24
Filing date: 2012-02-23
Publication date: 2012-08-30
Also published as: JPWO2012115184A1; BR112013020840A2; JP5673795B2

Abstract

In the present invention, an impeller (5) is structured with the inner ends of a subset of a plurality of vanes (6) being joined to a rotary shaft (7) and the outer ends of each vane being joined to an annular connection section (8). A pedestal (27) is formed by the bottom wall of a housing (1) protruding upwards, and has a cylindrical outer peripheral surface that corresponds to a space region inside the annular connection section. At the upper center of the pedestal, a bearing-mounting hole (28) to the inner peripheral surface of which an inner screw protrusion (28a) has been formed is provided, and a lower bearing (26) that supports the bottom end of the rotary shaft of the impeller is mounted. The lower bearing has a bearing section (31) and an outer screw protrusion (26a) that threads to the inner screw protrusion is formed at the outer peripheral surface. The position in the vertical direction of the lower bearing with respect to the bearing-mounting hole can be adjusted via the threading of the outer screw protrusion and the inner screw protrusion. The present invention is able to provide a structure for adjusting the position of the lower bearing without follow-up machining of the pedestal after injection molding and with few components.

Description

Turbo blood pump and method for manufacturing the same

The present invention relates to a turbo-type blood pump that applies a centrifugal force to blood by the rotation of the impeller to cause the blood to flow, and particularly relates to a structure of a bearing portion for supporting the rotation shaft of the impeller.

A blood pump is indispensable for extracorporeal blood circulation in an oxygenator or the like. A turbo blood pump is known as a kind of blood pump. The turbo blood pump is configured to generate a differential pressure for feeding blood by centrifugal force by rotating an impeller (impeller) in a pump chamber.

The turbo blood pump can reduce the size, weight, and cost of the blood pump because of its operating principle. Further, since the tube is not damaged like the roller pump type blood pump and the durability of the blood pump is excellent, it is suitable for continuous operation for a long time. Therefore, the turbo blood pump is extremely useful as a blood pump for an extracorporeal circulation circuit of a heart-lung machine or a heart assist device after open heart surgery.

For example, a turbo blood pump described in Patent Document 1 has a structure as shown in FIG. In the figure, reference numeral 1 denotes a housing, which forms a pump chamber 2 for allowing blood to pass and flow. The housing 1 is provided with an inlet port 3 that communicates with an upper portion of the pump chamber 2 and an outlet port 4 that communicates with a side portion of the pump chamber 2. An impeller 5 is disposed in the pump chamber 2. The impeller 5 includes six vanes 6, a rotating shaft 7, and a ring-shaped annular coupling portion 8.

4 is a top view of the impeller 5 and FIG. 5 is a cross-sectional view of the impeller 5. As shown in FIG. 4, the six vanes include two types of shapes, that is, a main vane 6a and a shorter sub vane 6b, which are alternately arranged. The main vane 6a and the sub vane 6b are collectively referred to as vane 6. The main vane 6 a has a center side end connected to the rotating shaft 7 and a peripheral side end connected to the annular connecting portion 8. The sub vane 6 b has a central end that is not coupled to the rotating shaft 7 but is a free end, and only a peripheral end is coupled to the annular coupling portion 8. By mixing the sub vanes 6b, the blockage of the flow path by the vanes 6 is reduced as compared with the case where all the vanes 6 are coupled to the rotary shaft 7. Therefore, the number of main vanes 6a is set to a minimum range for supporting the impeller 5 with the rotary shaft 7 and obtaining a sufficient driving force. However, since the vanes 6 are normally arranged at equal intervals in the circumferential direction, the number of main vanes 6a is set to at least three. 3 shows only the shape along the main vane 6a shown in FIG. 4 for the convenience of illustration.

The lower end edge of the vane 6 (both the main vane 6a and the sub vane 6b) is arranged so that the apex is along the conical surface with the upward direction. That is, the vane 6 is inclined with respect to the rotating shaft 7 to form a mixed flow pump. The shape of the vane 6 is a three-dimensional curved surface. Accordingly, it is possible to realize a blood pump with reduced hemolysis by suppressing cavitation (flow separation, vortex) generated on the outlet side of the vane 6 while having sufficient ejection ability.

As shown in FIG. 3, the rotating shaft 7 is rotatably supported by an upper bearing 9 and a lower bearing 10 provided in the housing 1. Therefore, the impeller 5 is supported in a stable state at the vertical position by the upper bearing 9 and the lower bearing 10, and the rotation thereof is stabilized. The annular connecting portion 8 is provided with a magnet case 11, and a driven magnet 12 is embedded in the magnet case 11. The driven magnets 12 have a columnar shape, and are arranged in the circumferential direction of the annular connecting portion 8 at regular intervals. The annular connecting portion 8 and the magnet case 11 form a cylindrical inner peripheral surface.

A rotor 13 is disposed at the bottom of the housing 1. The rotor 13 has a structure in which a substantially cylindrical magnetic coupling portion 15 is provided on the drive shaft 14. Although not shown, the drive shaft 14 is rotatably supported and connected to a rotation drive source such as a motor to be rotated. Further, the positional relationship between the rotor 13 and the housing 1 is kept constant by elements not shown. A drive magnet 16 is embedded in the upper surface portion of the magnetic coupling portion 15. The drive magnets 16 have a cylindrical shape, and are arranged at regular intervals with six pieces in the circumferential direction.

The driving magnet 16 is disposed so as to be in a positional relationship facing the driven magnet 12 across the wall of the housing 1. Accordingly, a magnetically coupled state is formed between the rotor 13 and the impeller 5, and by rotating the rotor 13, a rotational driving force is transmitted to the impeller 5 through magnetic coupling.

Since the lower end edge of the vane 6 is disposed along the conical surface, the upper and lower surfaces of the annular coupling portion 8 on which the driven magnet 12 is installed are not orthogonal to the rotation shaft 7 and are along the same conical surface. Yes. Similarly, the upper surface of the magnetic coupling portion 15 on which the drive magnet 16 is installed is also an inclined surface. As described above, since the driven magnet 12 and the drive magnet 16 form a magnetic coupling on the surface inclined with respect to the rotation axis of the impeller 5, the magnetic attractive force acting between the impeller 5 and the rotor 13 is reduced. It occurs in a direction inclined with respect to the rotation axis of the impeller 5. As a result, the downward load on the lower bearing 10 is reduced.

The impeller 5 has a space 17 in an inner region of the annular coupling portion 8, and a flow path penetrating vertically between the vanes 6 is formed. A pedestal 18 having a cylindrical outer peripheral surface protruding upward, that is, inside the pump chamber 2 is formed at the center of the bottom of the housing 1. The pedestal 18 is formed so as to fill the space 17 in the region inside the driven magnet 12 and the annular coupling portion 8 below the impeller 5, and the volume of the space is suppressed to the minimum. The upper surface of the pedestal 18 is formed as a conical inclined surface whose apex is directed upward along the lower edge of the vane 6. The bottom of the housing 1 around the pedestal 18 is also formed on the same inclined surface.

Since the pedestal 18 is formed, the blood filling amount in the pump chamber 2 is reduced. Further, since the annular connecting portion 8 is not of a size that covers the entire bottom surface of the housing 1 but the space 17 is formed, the impeller 5 becomes light in weight, and the driving force necessary for rotation is reduced. The lower bearing 10 is provided at the center of the upper surface of the pedestal 18. The upper bearing 9 is supported at the tips of three bearing columns 19 disposed in the lower end portion of the inlet port 3.

The above configuration is effective to improve the state where blood stays in the lower part of the impeller 5 and to eliminate the possibility that thrombus may be formed when the blood pump is used for a long time (percutaneous cardiopulmonary assist method, etc.). It is. That is, in the space region inside the annular connecting portion 8, a flow path that penetrates between the vanes 6 is formed, and the blood that flows to the lower portion of the impeller 5 passes through the vicinity of the lower bearing 10 and passes through the vane. This is because an action of flowing out toward the outer diameter direction of 6 is obtained.

The impeller 5 further has a sealing member 20 arranged at the lower part of the vane 6 in a region extending between the rotary shaft 7 and the annular connecting portion 8. The sealing member 20 seals the flow path penetrating between the vane 6 from the space in the region between the rotating shaft 7 and the annular connecting portion 8, leaving a part of the opening 21 around the rotating shaft 7. Yes.

By providing the sealing member 20, the effect of suppressing the formation of thrombus in the vicinity of the lower bearing 10 on the upper surface of the base 18 is improved. That is, the flow of blood on the bottom surface of the housing 1 flowing toward the center of the impeller 5 along the lower surface of the sealing member 20 is strengthened. Since the blood flow then rises through the opening 21 of the sealing member 20, a blood flow having a sufficient speed is formed along the rotary shaft 7 adjacent to the lower bearing 10, and the cleaning effect on the lower bearing 10 is improved. .

JP 2010-207346 A

In the conventional turbo type blood pump shown in FIG. 3, the structure of the lower bearing 10 and the pedestal 18 around it is described in a simplified manner, but a more specific structure is shown in FIG.

A vertical through-hole is provided in the center of the base 18 to form a bearing mounting hole 22 and an adjustment screw mounting hole 23. The lower bearing 10 is mounted in the bearing mounting hole 22, and the adjustment screw 24 is mounted in the adjustment screw mounting hole 23. A female screw is formed on the inner peripheral surface of the adjustment screw mounting hole 23, and a male screw is formed on the outer peripheral surface of the adjustment screw 24.

The housing 1 is divided into an upper half 1a on the side including the inlet port 3 and a lower half 1b on the side including the pedestal 18 at the upper and lower dividing surfaces 25. The upper bearing 9 is provided on the upper half 1a. The impeller 5 is mounted in the housing 1 by connecting the upper half 1a and the lower half 1b so that the rotary shaft 7 is supported between the upper bearing 9 and the lower bearing 10.

The position of the adjustment screw 24 can be adjusted by screwing with the adjustment screw mounting hole 23. Accordingly, the lower bearing 10 is mounted in the bearing mounting hole 22, the rotating shaft 7 is supported between the upper bearing 9 and the lower bearing 10, and the upper half 1a and the lower half 1b are coupled, and then the adjusting screw. By rotating 24 and adjusting the vertical position of the lower bearing 10, the inter-bearing distance H between the upper bearing 9 and the lower bearing 10 can be adjusted.

The rotational torque of the impeller 5 is affected by the distance H between the bearings. In the state where the blood pump is just assembled, the distance H between the bearings is not constant due to a slight error in the dimensions of the molded product and the shaft dimension, and there is also an error in the length of the rotating shaft 7. Variation occurs. Therefore, providing the adjusting screw 24 for adjusting the distance H between the bearings is indispensable for stabilizing the quality.

However, for this purpose, in the case of the above configuration, the adjustment screw 24 is necessary as an element part in addition to the lower bearing 10. Therefore, it is inevitable that the increase in the component cost due to the increase in the number of components and the complexity of the manufacturing process due to the large number of components contribute to the increase in cost.

Further, it is necessary to add a screw hole to the adjusting screw mounting hole 23 after the injection molding for the pedestal 18 provided in the housing 1. This also increases the complexity of the manufacturing process and increases the cost.

Accordingly, the present invention provides a turbo blood pump having a structure capable of improving the structure for adjusting the position of the lower bearing with respect to the rotating shaft of the impeller, reducing the number of parts, and improving the simplicity of the manufacturing process. The purpose is to do.

The turbo blood pump of the present invention includes a housing that forms a pump chamber, an inlet port is provided at an upper portion and an outlet port is provided at a side portion, a rotating shaft, a plurality of vanes, and an annular connecting portion, An inner peripheral end of at least a part of the plurality of vanes is coupled to the rotating shaft, and an outer peripheral end of each vane is formed by projecting an impeller coupled to the annular coupling portion and a bottom wall of the housing upward A pedestal having a cylindrical outer peripheral surface corresponding to a space region formed by the cylindrical inner peripheral surface of the annular coupling portion, an upper bearing that rotatably supports an upper end of a rotating shaft of the impeller, and the pedestal A lower bearing that is provided on the upper surface of the housing and rotatably supports the lower end of the rotating shaft of the impeller, and is disposed on the outer lower portion of the housing, and rotationally drives the impeller through magnetic coupling with the annular coupling portion. And a chromatography data.

In order to solve the above problems, a bearing mounting hole having an inner surface threaded protrusion formed on an inner peripheral surface is provided in the center of the pedestal, and the lower bearing has the lower end of the rotating shaft of the impeller at its upper end. In addition to having a bearing portion to support, an outer surface threaded protrusion is formed on the outer peripheral surface to be screwed with the inner surface threaded protrusion, and is mounted in the bearing mounting hole through the threaded engagement.

A method for manufacturing a turbo blood pump according to the present invention is a method for manufacturing a turbo blood pump having the above-described configuration, wherein the lower bearing is mounted in the bearing mounting hole, and the rotating shaft is connected to the upper bearing and the lower bearing. After the impeller is mounted in the housing so as to be supported in between, the lower bearing exposed below the bearing mounting hole is rotated to screw the outer thread protrusion and the inner thread protrusion. An operation for adjusting the position of the lower bearing in the vertical direction is performed.

According to the above configuration, since the lower bearing itself has the external thread protrusion, a structure for adjusting the position in the vertical direction is formed without requiring other members. Therefore, it is possible to reduce the cost of the product without increasing the number of parts and improving the simplicity of the manufacturing process.

FIG. 1 is a cross-sectional view of a turbo blood pump according to an embodiment of the present invention. FIG. 2A is a perspective view showing a configuration of a lower bearing of the turbo blood pump. FIG. 2B is a perspective view showing a configuration of a pedestal in the housing of the turbo blood pump. FIG. 3 is a cross-sectional view of a conventional turbo blood pump. FIG. 4 is a top view of the impeller of the turbo blood pump of FIG. FIG. 5 is a cross-sectional view of the impeller. FIG. 6 is a cross-sectional view showing the bearing structure of the turbo blood pump of FIG.

The present invention can take the following aspects based on the above configuration.

That is, in the turbo type blood pump having the above-described configuration, the inner surface thread protrusion forms two threads, and the threads of each thread are set to a length equal to or less than a half circumference in the circumferential direction of the bearing mounting hole. The screw threads are preferably arranged in regions that do not overlap each other in the circumferential direction. In particular, it is preferable that the thread of each strip forming the inner surface thread protrusion is set to a length of a half circumference in the circumferential direction of the bearing mounting hole. According to this configuration, it is easy to form an internal thread protrusion in the bearing mounting hole of the pedestal by injection molding and eliminate the need for additional work on the pedestal after injection molding.

Further, the bearing mounting hole is a through hole, and an engaging portion with a tool for rotating the lower bearing is provided at a lower end portion of the lower bearing exposed below the bearing mounting hole. Is preferred. According to this configuration, the impeller is mounted in the pump chamber so that the rotating shaft is supported between the upper bearing and the lower bearing, and the position of the lower bearing in the bearing mounting hole is adjusted to And the process of appropriately setting the distance between the lower bearing and the lower bearing.

Further, it is preferable that a gap between the inner peripheral surface of the bearing mounting hole and the outer peripheral surface of the lower bearing is sealed with an adhesive on the lower end side of the mounted lower bearing. According to this configuration, after adjusting the position of the lower bearing from the outside, it is possible to easily avoid communication between the pump chamber and the outside through the gap between the inner peripheral surface of the bearing mounting hole and the outer peripheral surface of the lower bearing. .

The lower end edge of the vane has an inclination that becomes higher toward the rotation axis, and the impeller is formed with a conical inclined surface along the inclination of the lower end edge of the vane, and the plurality of vanes A sealing member that restricts a flow path between the rotating shaft and a region around the rotating shaft is provided at a lower portion of the vane, and the lower bearing has an upper surface that forms an inclined surface along the inclined surface of the sealing member, A configuration including an upper diameter large portion having a diameter larger than that of the bearing mounting hole, and a lower cylindrical portion forming a lower portion thereof and having an outer peripheral diameter smaller than that of the bearing mounting hole and having the outer surface thread protrusion formed on the outer peripheral surface. It can be. According to this configuration, the diameter of the lower bearing can be increased by replacing a part of the upper surface of the pedestal that forms the flow path between the sealing member and the upper surface of the lower bearing. Thereby, handling of the lower bearing in the manufacturing process is facilitated, and the shape of the pedestal can be simplified.

In the method for manufacturing a turbo blood pump having the above-described structure, the housing is formed by dividing the housing into an upper half on the side including the inlet port and a lower half on the side including the pedestal, and the upper bearing. Is attached to the upper half body, and the upper half body and the lower half body are coupled to each other so that the rotating shaft is supported between the upper bearing and the lower bearing. It may include a step of mounting inside. According to this process, it is possible to easily perform the operation of mounting the impeller in the pump chamber so that the rotating shaft is supported between the upper bearing and the lower bearing.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment)
FIG. 1 is a cross-sectional view showing a turbo blood pump according to Embodiment 1 of the present invention. The basic structure of this turbo blood pump is the same as that of the conventional example shown in FIGS. Therefore, elements similar to those shown in FIGS. 3 to 5 are denoted by the same reference numerals, and the repeated description is simplified.

In the turbo type blood pump shown in FIG. 1, the impeller 5 disposed in the pump chamber 2 formed by the housing 1 has a plurality of vanes 6 as in the conventional example, and at least a part of the inner peripheral end thereof is The outer peripheral end of each vane 6 is coupled to an annular connecting portion 8 that is coupled to the rotary shaft 7 and forms an outer peripheral edge. The rotary shaft 7 is rotatably supported by the upper bearing 9 and the lower bearing 26. The lower bearing 26 is mounted in a bearing mounting hole 28 provided in the upper surface portion of the base 27. The configuration of the lower bearing 26 is shown in a perspective view in FIG. 2A, and the configuration of a pedestal 27 having a bearing mounting hole 28 is shown in a perspective view in FIG. 2B.

The housing 1 is divided into two parts by an upper and lower dividing surface 25 into an upper half 1 a including the inlet port 3 and a lower half 1 b including the pedestal 27. The upper bearing 9 is provided on the upper half 1a. The impeller 5 is mounted in the housing 1 by connecting the upper half 1a and the lower half 1b so that the rotary shaft 7 is supported between the upper bearing 9 and the lower bearing 26.

The pedestal 27 is formed by projecting upward the central portion inside the bottom wall of the housing 1, and has a cylindrical outer peripheral surface corresponding to a space region formed by the cylindrical inner peripheral surface of the annular coupling portion 8. . A part of the upper surface of the pedestal 27 is formed by the upper surface of the lower bearing 26, and is a conical inclined surface whose apex is directed upward. Note that the surface of the bottom surface of the housing 1 that faces the annular connecting portion 8 is also an inclined surface along the annular connecting portion 8.

The impeller 5 includes a sealing member 20 disposed below the vane 6. The blocking member 20 forms a conical inclined surface along the inclination of the lower end edge of the vane 6. The sealing member 20 seals the space in the inner region of the annular coupling portion 8 leaving the opening 21 around the rotating shaft 7.

As shown in FIG. 2B, a through hole is provided in the central portion of the pedestal 27 to form a bearing mounting hole 28. As shown in FIG. 2A, the lower bearing 26 has an upper large-diameter portion 29 whose outer peripheral diameter is larger than that of the bearing mounting hole 28, and a cylindrical portion that forms a lower portion thereof and whose outer peripheral diameter is smaller than that of the bearing mounting hole 28. 30. A bearing 31 that supports the lower end of the rotating shaft 7 of the impeller 5 is formed at the upper end of the lower bearing 26.

An internal thread protrusion 28 a is formed on the inner peripheral surface of the bearing mounting hole 28. On the outer peripheral surface of the cylindrical portion 30 of the lower bearing 26, an outer surface thread protrusion 26a that is screwed with the inner surface thread protrusion 28a is formed. The large diameter portion 29 of the lower bearing 26 forms an inclined surface whose upper surface is along the inclined surface of the sealing member 20.

The lower bearing 26 is mounted in the bearing mounting hole 28 by screwing the outer thread protrusion 26a with the inner thread protrusion 28a. Since the bearing mounting hole 28 is a through-hole, when the lower bearing 26 is mounted in the bearing mounting hole 28, the lower end thereof is exposed below the bearing mounting hole 28. An engaging portion 32 (FIG. 1) with a tool for rotating the lower bearing 26 is provided at the lower end portion of the exposed lower bearing 26. Accordingly, in the manufacturing process, an operation of rotating the lower bearing 26 by engaging the tool with the engaging portion 32 is performed. As a result, the vertical position of the lower bearing 26 in the bearing mounting hole 28 can be adjusted via the screwing of the outer thread protrusion 26a and the inner thread protrusion 28a.

After adjusting the position of the lower bearing 26 so that the distance between the bearings is appropriate, the gap between the inner peripheral surface of the bearing mounting hole 28 and the outer peripheral surface of the lower bearing 26 is blocked by an adhesive. This is because the pump chamber 2 communicates with the outside through a gap between the inner peripheral surface of the bearing mounting hole 28 and the outer peripheral surface of the lower bearing 26 when the lower bearing 26 is simply mounted. Thus, in the unfinished state of the mounting process of the lower bearing 26 in the manufacturing process, it is possible to adjust the vertical position of the lower bearing 26 through the screwing of the outer thread protrusion 26a and the inner thread protrusion 28a. After the manufacturing is completed, the position of the lower bearing 26 is fixed.

Note that it is not essential that the bearing mounting hole 28 be a through hole. That is, it is also possible to configure so that the adjustment for rotating the lower bearing 26 is performed by another method. For example, the lower bearing 26 can be rotated using the opening of the inlet port 3. Alternatively, it is also possible to adjust the position of the lower bearing 26 with respect to the bearing mounting hole 28 in the state of only the lower half 1b. That is, the dimensional accuracy of the upper half 1a and the lower half 1b, the accuracy of the position of the upper bearing 9 and the like are measured, and the positional relationship for setting the lower bearing 26 with respect to the bearing mounting hole 28 is calculated. Next, based on the calculated value, the position of the lower bearing 26 is adjusted with respect to the bearing mounting hole 28 with only the lower half 1b. Thereafter, the impeller 5 is attached to combine the upper half 1a and the lower half 1b.

As shown in FIG. 2B, the internal thread protrusion 28a forms two threads, and the thread of each thread is set to the length of the half circumference in the circumferential direction of the bearing mounting hole 28. In addition, the threads of the respective strips are arranged in regions that do not overlap with each other in the circumferential direction. As a result, the structure in which the inner surface screw projections 28a are formed on the inner peripheral surface of the bearing mounting hole 28 can be easily manufactured by injection molding.

っても Even if it is a two-thread thread with only a half circumference, it is possible to provide a margin for adjusting the distance between the bearings by setting the pitch arbitrarily. Each thread of the inner surface thread protrusion 28a may have a length less than a half circumference. However, it is necessary to secure a length that allows an appropriate screwed state with the outer surface screw projection 26a.

As described above, according to the configuration of the present embodiment, the structure for adjusting the position of the lower bearing 26 is formed with a small number of parts, and no additional work is required for the pedestal 27 after injection molding. Thereby, the lower bearing structure which can adjust rotational torque at lower cost can be provided.

It should be noted that the turbo blood pump of the present embodiment can be configured using the following materials as an example. As the material of the impeller 5 and the housing 1 (and hence the material of the pedestal 27), for example, a synthetic resin such as polycarbonate, polyethylene terephthalate, polysulfone, etc. is used in terms of weight reduction, easy moldability, strength, dimensional stability, and the like. Can do. The material of the bearing is not particularly limited as long as it has high wear resistance. For example, high durability plastics such as ultra high molecular weight polyethylene and polyether ether ketone (PEEK) can be suitably used. As a material of the rotating shaft 7 of the impeller 5, for example, SUS (stainless steel) can be used.

The turbo blood pump of the present invention can be manufactured at a low cost for adjusting the position of the lower bearing with respect to the rotation shaft of the impeller, and is useful as a blood pump used for extracorporeal blood circulation in an oxygenator or the like.

DESCRIPTION OF SYMBOLS 1 Housing 1a Upper half body 1b Lower half body 2 Pump chamber 3 Inlet port 4 Outlet port 5 Impeller 6 Vane

6a Main vane

6b Sub vane 7 Rotating shaft 8 Annular connection part 9

Upper bearing

10, 26 Lower bearing 11 Magnet case 12 Driven magnet DESCRIPTION OF SYMBOLS 13 Rotor 14 Drive shaft 15 Magnetic coupling part 16 Drive magnet 17

Space

18, 27 Base 19 Bearing support | pillar 20 Sealing member 21

Opening part

22, 28 Bearing mounting hole 23 Adjustment screw mounting hole 24 Adjustment screw 25 Vertical split surface 26a Outer surface thread protrusion 28a Internal thread protrusion 29 Large diameter part 30 Cylindrical part 31 Bearing part

Claims

A housing that forms a pump chamber and is provided with an inlet port at the top and an outlet port at the side;
A rotating shaft, a plurality of vanes, and an annular connecting portion, wherein at least some of the inner peripheral ends of the plurality of vanes are connected to the rotating shaft, and the outer peripheral ends of the vanes are connected to the annular connecting portion; Impeller,
A pedestal having a cylindrical outer peripheral surface formed by projecting the bottom wall of the housing upward and corresponding to a space region formed by the cylindrical inner peripheral surface of the annular coupling portion;
An upper bearing that rotatably supports the upper end of the rotating shaft of the impeller;
A lower bearing which is provided on the upper surface of the pedestal and rotatably supports the lower end of the rotating shaft of the impeller;
In the turbo blood pump, which is disposed at the outer lower portion of the housing and includes a rotor that rotationally drives the impeller through magnetic coupling with the annular coupling portion,
In the central part of the pedestal is provided a bearing mounting hole in which an internal thread protrusion is formed on the inner peripheral surface,
The lower bearing has a bearing portion that supports a lower end of the rotating shaft of the impeller at an upper end thereof, and an outer surface threaded protrusion that is screwed with the inner surface threaded protrusion is formed on an outer peripheral surface. A turbo blood pump characterized by being mounted in a mounting hole.
The inner surface thread projections form two threads, and each thread is set to a length not more than a half circumference in the circumferential direction of the bearing mounting hole. The turbo type blood pump according to claim 1, wherein the turbo blood pump is disposed in a region that does not become necessary.
The turbo blood pump according to claim 2, wherein the thread of each strip forming the internal thread protrusion is set to a length of a half circumference in the circumferential direction of the bearing mounting hole.
2. The bearing mounting hole is a through hole, and an engaging portion with a tool for rotating the lower bearing is provided at a lower end portion of the lower bearing exposed below the bearing mounting hole. 4. The turbo blood pump according to any one of items 1 to 3.
The turbo blood pump according to claim 4, wherein a gap between an inner peripheral surface of the bearing mounting hole and an outer peripheral surface of the lower bearing is sealed with an adhesive on a lower end side of the mounted lower bearing.
The lower edge of the vane has an inclination that increases toward the rotation axis,
The impeller includes a sealing member that forms a conical inclined surface along an inclination of a lower end edge of the vane and restricts a flow path between the plurality of vanes to a region around the rotating shaft. At the bottom of the
The lower bearing has an upper surface forming an inclined surface along the inclined surface of the sealing member, an outer peripheral diameter larger than the bearing mounting hole, and a lower portion thereof, and the outer peripheral diameter is the bearing mounting hole. The turbo blood pump according to any one of claims 1 to 5, further comprising a lower cylindrical portion that is smaller than the lower cylindrical portion and has the outer surface thread projection formed on an outer peripheral surface thereof.
It is a manufacturing method of the turbo type blood pump according to claim 1,
The bearing mounting hole is a through hole,
Attaching the lower bearing to the bearing mounting hole,
After mounting the impeller in the housing so that the rotating shaft is supported between the upper bearing and the lower bearing,
The lower bearing exposed below the bearing mounting hole is rotated, and an operation of adjusting the vertical position of the lower bearing is performed through screwing of the outer surface screw protrusion and the inner surface screw protrusion. A method for producing a turbo blood pump.
Forming the housing in two divided into an upper half on the side including the inlet port and a lower half on the side including the pedestal, and providing the upper bearing on the upper half;
8. The impeller is mounted in the housing by coupling the upper half and the lower half so that the rotating shaft is supported between the upper bearing and the lower bearing. A method for producing a turbo blood pump according to claim 1.