JP5440528B2 - Turbo blood pump and method for manufacturing the same - Google Patents

Description

  The present invention relates to a turbo-type blood pump that applies centrifugal force to blood by the rotation of an impeller to cause it to flow, and in particular, a housing structure for forming a pump chamber in which an impeller is rotatably accommodated. Regarding improvements.

  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 type blood pump can reduce the size, weight and cost of the blood pump because of its operating principle. Further, unlike the roller pump type blood pump, the tube is not damaged, and the blood pump is excellent in durability. Therefore, it can be suitably used for long-time continuous operation. 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.

  A top view of the impeller 5 is shown in FIG. 10, and a cross-sectional view of the impeller 5 is shown in FIG. As shown in FIG. 10, the six vanes include two types of shapes, that is, a main vane 6a and a sub vane 6b shorter than the main vane 6a, 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 obstruction 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 main vane 6a is set to the minimum number for supporting the impeller 5 with the rotating shaft 7 and obtaining sufficient driving force. For the convenience of illustration, only the shape along the main vane 6a shown in FIG. 10 is shown as the cross-sectional shape of the vane 6 in FIG.

  The lower end edge of the vane 6 (both the main vane 6a and the sub vane 6b) is disposed 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. 9, 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 becomes stable. The annular connecting portion 8 is provided with a magnet case 11, and a driven magnet 12 is embedded and fixed 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 lower part 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 and fixed on 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 drive magnet 16 is disposed so as to face 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 that penetrates 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 that is convex 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.

  By forming the pedestal 18, 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 includes a blocking member 20 disposed below the vane 6 in a region extending between the rotating shaft 7 and the annular coupling portion 8. The closing member 20 seals a flow path penetrating between the vane 6 from a space in a region extending 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 closing member 20, the effect of suppressing thrombus formation 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

  Regarding the structure of the housing 1 in the blood pump having the above-described configuration, the present inventor has examined improvements for facilitating the manufacture. A desirable structural plan is based on the premise that the housing 1 is divided into two parts by an upper and lower dividing surface into an upper member on the side including the inlet port 3 and a lower member on the side including the base 18. In that case, in order to mount the impeller 5 in the housing 1, the upper member and the lower member are coupled with the rotating shaft 7 supported between the upper bearing 9 and the lower bearing 10.

  In order to form the inner surface of the pump chamber 2, the lower member includes a bottom wall that forms a bottom surface including the pedestal 18 and a side wall that forms a part of the side surface of the housing 1. A portion where the lower end portion of the side wall of the upper member and the upper end portion of the side wall of the lower member are in contact with each other is an upper and lower divided surface, and the upper member and the lower member are joined at that portion.

  In such a divided structure of the housing 1, it is desirable that the side wall of the lower member is configured to form an inclined surface as shown in FIG. 9. This is because the vane 6 is inclined with respect to the rotating shaft 7 and the annular connecting portion 8 is also inclined accordingly, so that the edge surface of the annular connecting portion 8 is inclined. That is, in this embodiment, when the side wall of the lower member is parallel to the rotation shaft 7, the volume of the space formed between the edge surface of the annular connecting portion 8 is increased, which causes an increase in blood filling amount. . In order to avoid this, the side wall of the lower member takes a shape inclined according to the edge surface of the annular connecting portion 8.

  When the inclined side wall is formed in this way, it is difficult to directly join the side wall of the upper member and the side wall of the lower member by ultrasonic welding that is usually used. For this reason, the side walls of the upper member and the lower member must be joined together with an adhesive such as urethane resin at a location where the side walls abut each other. In this case, if an adhesive such as urethane resin leaks into the pump chamber 2, it causes a failure, and thus a structural device for avoiding such a situation is indispensable.

  Therefore, the present invention has a configuration capable of effectively avoiding the formation of a thrombus, and it is possible to easily join the upper member and the lower member forming the housing with an adhesive without causing defects. An object of the present invention is to provide a turbo blood pump having a housing structure and a manufacturing method thereof.

  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, and an upper end of the rotating shaft of the impeller disposed rotatably on the housing. An upper bearing, a lower bearing provided on an upper surface of the pedestal and rotatably supporting a lower end of a rotating shaft of the impeller, and disposed on an outer lower portion of the housing via magnetic coupling with the annular coupling portion. A rotor for rotating the impeller, the lower edge of the vane is inclined with respect to the rotation axis along the upward conical surface.

  In order to solve the above problems, in the turbo blood pump of the present invention, the housing is divided into two parts, an upper member on the side including the inlet port and the outlet port and a lower member on the side including the pedestal. The upper member has a peripheral edge extending downward to form a cylindrical joining cylindrical wall, the lower member including the pedestal and a bottom wall forming the bottom of the pump chamber, and the pump chamber Including a side wall that forms a part of the side portion and extends obliquely upward and outward, and a peripheral portion of the side wall of the lower member is located inside a proximal end portion of the joining cylindrical wall of the upper member And the concave portion formed between the side wall and the joining cylindrical wall is filled with an adhesive at a location where the peripheral edge of the side wall contacts the proximal end of the joining cylindrical wall. The upper member and the lower member are joined together.

  A turbo blood pump manufacturing method according to the present invention is a method for manufacturing a blood pump having the above-described configuration, wherein the impeller is disposed between the upper member and the lower member of the housing, and the rotating shaft is the upper portion. A peripheral edge of the side wall of the lower member is fitted inside a base end portion of the joining cylindrical wall of the upper member so as to be supported by the bearing and the lower bearing, and the side wall In a place where the peripheral edge of the cylindrical member abuts on the proximal end portion of the joining cylindrical wall, the concave portion formed between the side wall and the joining cylindrical wall is filled with an adhesive and solidified so that the upper member and the lower member are solidified. It is characterized by joining the members.

  According to the above configuration, since the coupling structure in which the side wall extending diagonally upward and outward of the lower member is fitted inside the cylindrical joining cylindrical wall of the upper member, the side wall and the joining cylinder are used. The concave portion formed between the walls can be easily filled with the adhesive, and a temporary bonding step is unnecessary, and the risk of the adhesive leaking into the pump chamber is also eliminated. Accordingly, while adopting a structure in which the lower member has the inclined side wall so that the formation of thrombus can be effectively avoided, the joining process of the upper member and the lower member is simplified, and the manufacturing cost of the housing is reduced. be able to.

Sectional drawing of the turbo type blood pump in embodiment of this invention Sectional drawing which decomposes | disassembles the turbo type blood pump and shows a structure The perspective view which shows the lower member which comprises the housing of the turbo type blood pump Sectional drawing which shows 1 process of the manufacturing method of the turbo type blood pump Sectional drawing which shows the structure of the turbo type blood pump of a comparative example Sectional drawing which decomposes | disassembles the turbo type blood pump and shows a structure The perspective view which shows the lower member which comprises the housing of the turbo type blood pump The perspective view which shows a part of manufacturing process of the turbo type blood pump Sectional view of a conventional turbo blood pump Top view of impeller of turbo type blood pump of FIG. Cross section of the impeller

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

  That is, in the turbo blood pump having the above-described configuration, the upper surface of the pedestal and the bottom wall of the housing around the pedestal can be formed in a conical surface along the lower end edge of the vane. .

  Moreover, it can be set as the structure by which the recessed part for arrange | positioning the said rotor is formed by the said bottom part wall of the said lower member.

  Further, in the method for manufacturing a turbo blood pump having the above-described configuration, after forming a fitting body in which the peripheral edge portion of the side wall is fitted inside the base end portion of the joining cylindrical wall, the rotation shaft is in the vertical direction. It is preferable that the fitting body is arranged so that the lower member is positioned above the upper member and the adhesive is filled in the concave portion.

  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 an embodiment 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. 9 to 11 are denoted by the same reference numerals, and the repeated description is simplified.

  In the turbo type blood pump of the present embodiment shown in FIG. 1, the impeller 5 disposed in the pump chamber 2 formed by the housing 22 has a plurality of vanes 6, 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 rotating shaft 7 is rotatably supported by an upper bearing 9 and a lower bearing 10. The lower bearing 10 is provided on the upper surface of the pedestal 18.

  The housing 1 is divided into two parts by an upper and lower dividing surface 23 into an upper member 24 including the inlet port 3 and the outlet port 4 and a lower member 25 including the base 18. The upper bearing 9 is provided on the upper member 24. The impeller 5 has a rotating shaft 7 supported by an upper bearing 9 and a lower bearing 10, and the upper member 24 and the lower member 25 are joined in this state.

  The pedestal 18 is formed by projecting upward the central portion inside the bottom wall of the housing 22, and has a cylindrical outer peripheral surface corresponding to the space region formed by the cylindrical inner peripheral surface of the annular coupling 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 closing member 20 seals the space in the inner region of the annular connecting portion 8, leaving the opening 21 around the rotating shaft 7.

  The present embodiment is characterized by the shape of the lower member 25 and the joining form of the upper member 24 and the lower member 25. FIG. 2 is a sectional view showing an exploded state before the upper member 24 and the lower member 25 of the turbo blood pump of FIG. A state where the impeller 5 is mounted on the lower member 25 is shown. The upper and lower dividing surfaces 23 are provided at positions that divide the outlet port 4 into two vertically, but the peripheral edge of the upper member 24 extends downward to form a cylindrical joining outer cylinder wall 24a. The port 4 is formed so as to be attached to the upper member 24.

  The appearance of only the lower member 25 is shown in a perspective view in FIG. The lower member 25 has a bottom wall 25 a that forms the bottom of the pump chamber 2 including the base 18, and a side wall 25 b that forms a part of the side of the pump chamber 2. The side wall 25b extends obliquely upward and outward. The surface including the upper surface of the pedestal 18 and the upper surface of the lower bearing 10 is a conical inclined surface that is convex upward. Further, the bottom wall 25 a around the pedestal 18, that is, the wall surface facing the annular connecting portion 8 is also an inclined surface along the annular connecting portion 8. Further, a lower cylindrical wall 25c is provided that extends downwardly from the boundary between the bottom wall 25a and the side wall 25b, and forms a recess (see FIG. 1) in which the rotor 13 is disposed.

  The peripheral edge of the side wall 25 b of the lower member 25 is fitted inside the joined outer cylindrical wall 24 a of the upper member 24. The adhesive 26 is filled in the concave portion formed between the side wall 25b and the joining cylindrical wall 24a at the place where the peripheral edge of the side wall 25b contacts the base end of the joining cylindrical wall 24a by the fitting. The upper member 24 and the lower member 25 are joined.

  In this structure, only the peripheral edge portion of the side wall 25b of the lower member 25 is fitted inside the joined outer cylindrical wall 24a. With this structure, it is possible to obtain a sufficiently stable and strong bonded state. Moreover, since the filling of the adhesive 26 is performed on the recessed portions formed and opened outside the side wall 25b and the joining outer cylinder wall 24a, both walls (side wall 25b, joining outer cylinder wall 24a) are purposely used. There is no need to inject adhesive into the joint surfaces. Therefore, the possibility of the adhesive 26 entering the pump chamber 2 from the fitting portion is low, and defects due to adhesive leakage are reduced. Moreover, a jig for injecting the adhesive is not necessary. As described above, the shape of the peripheral portion of the lower member 25 can be simplified, and the manufacturing is easy and effective in reducing the product cost.

  When the blood pump is assembled, an impeller is disposed between the upper member 24 and the lower member 25 so that the rotating shaft 7 is supported by the upper bearing 9 and the lower bearing 10. In that case, the peripheral part of the side wall 25b is fitted inside the base end part of the joining cylindrical wall 24a. Then, as shown in FIG. 4, the rotary shaft 7 is placed in the vertical direction and the lower member 25 and the upper member 24 are inverted. In this state, the concave portion formed between the side wall 25b and the joining cylindrical wall 24a is filled with the adhesive 26 and cured, and the joining of the upper member 24 and the lower member 25 is completed.

  In order to explain the advantages of the blood pump configured as described above, a comparative example shown in FIGS. 5 to 8 will be described. This comparative example was examined as an alternative to improving the structure of the housing to facilitate manufacture.

  The housing 27 shown in FIG. 5 is divided into two parts by an upper and lower dividing surface 23 into an upper member 24 including the inlet port 3 and a lower member 28 including the pedestal 18. FIG. 6 is a sectional view showing an exploded state before the upper member 24 and the lower member 28 are joined. A state where the impeller 5 is mounted on the lower member 28 is shown. In this comparative example, the structure of the lower member 28 is different from the lower member 25 in the present embodiment. The appearance of only the lower member 28 is shown in a perspective view in FIG.

  The lower member 28 includes, as element parts forming the inner surface of the pump chamber 2, a bottom wall 28 a that forms the bottom surface and the base 18 is formed, and a side wall 28 b that forms a part of the side surface. In addition, a lower cylindrical wall 28c is provided that branches and extends downward from the boundary between the bottom wall 28a and the side wall 28b. Further, the peripheral edge of the side wall 28b extends downward to form a cylindrical joined inner cylindrical wall 28d. The upper inner member 24 and the lower member 28 are joined together by fitting the inner joint cylindrical wall 28d inside the outer joint cylindrical wall 24a of the upper member 24.

  As shown in FIG. 5, a lumen is provided in the joining surface of the joining outer cylinder wall 24a and the joining inner cylinder wall 28d, and an adhesive 29 such as urethane resin is injected. The lumen is provided over the entire circumference of the housing 27. The joint outer cylindrical wall 24a is provided with an injection hole 30 for communicating the lumen with the outside, and an adhesive 29 is injected through the injection hole 30 to fix the fitting of the upper member 24 and the lower member 28.

  When assembling this blood pump, the upper member 24, the impeller 5 and the lower member 28 are prepared in the state shown in FIG. 6, and a solvent is applied to the solvent temporary bonding portion 31. Then, the bonded outer cylindrical wall 24a and the bonded inner cylindrical wall 28d are fitted and temporarily bonded as shown in FIG. The fitting part of the joining outer cylinder wall 24a and the joining inner cylinder wall 28d at this time is enlarged and shown in sectional drawing in FIG. In this state, an adhesive 29 such as a urethane resin is press-fitted with a syringe through the injection hole 30 and cured to complete the joining of the upper member 24 and the lower member 28.

  In the comparative example of the housing 27 described above, the shape of the peripheral portion of the lower member 28 is complicated. As described above, in order to avoid an increase in the blood filling amount, the side wall 28b is inclined in accordance with the inclination of the edge surface of the annular connecting portion 8, and the peripheral edge of the side wall 28b is attached for bonding. This results from adopting a configuration in which the bonded inner cylindrical wall 28d is formed extending in parallel to the rotation shaft 7 and the adhesive portion 29 is filled between the bonded outer cylindrical wall 24a.

  As a result, the structure for joining the lower member 28 is complicated, and the assembling process also requires temporary adhesion with a solvent and adhesion with an adhesive. Furthermore, when bonding with an adhesive, the adhesive must be injected by a syringe through the injection hole 30, and a jig is required. In addition, since the adhesive is press-fitted with a syringe, if temporary adhesion with a solvent is insufficient, an adhesive such as urethane resin may leak into the pump chamber 2 and cause a defect.

  In contrast, in the structure of the present embodiment described above, the joined inner cylindrical wall 28d of the lower member 28 provided in the case of the comparative example shown in FIGS. 6 and 7 is not provided. According to the result of the experiment, even if the joined inner cylindrical wall 28d is not provided, only the peripheral edge of the side wall 25b of the lower member 25 is fitted inside the joined outer cylindrical wall 24a, so that it is sufficiently stable and strong. It has been found that a combined state can be obtained. Thereby, the shape of the peripheral part of the lower member 25 can be simplified, manufacture is easy and it is effective for reduction of product cost.

  Moreover, according to this Embodiment, in the process of joining the upper member 24 and the lower member 25, the temporary adhesion | attachment by the solvent in the process of a comparative example is unnecessary. Further, since the adhesive 26 is filled in the open recess formed between the side wall 25b and the joining cylindrical wall 24a, it is not necessary to press-fit with the syringe when injecting the adhesive. . Therefore, the adhesive does not enter the inside of the pump chamber 2 from the fitting portion, which is effective in reducing the defect rate. In addition, since temporary bonding with a solvent is unnecessary, there is no need for solvent drying after coating, and work efficiency can be improved.

  In addition, the turbo blood pump of this Embodiment can be comprised 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 18), for example, a synthetic resin such as polycarbonate, polyethylene terephthalate, or polysulfone is used from the viewpoint 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 has a structure that can effectively avoid the formation of thrombus, and has a simple housing structure that can avoid the complexity of the manufacturing process. It is useful as a blood pump for circulation.

1, 22, 27 Housing 1a, 24 Upper member 1b, 25, 28 Lower member 2 Pump chamber 3 Inlet port 4 Outlet port 5 Impeller 6 Vane 6a Main vane 6b Sub vane 7 Rotating shaft 8 Annular connecting part 9 Upper bearing 10 Lower bearing DESCRIPTION OF SYMBOLS 11 Magnet case 12 Driven magnet 13 Rotor 14 Drive shaft 15 Magnetic coupling part 16 Drive magnet 17 Space 18 Base 19 Bearing support | pillar 20 Sealing member 21 Opening part 23 Vertical split surface 24a Joining outer cylinder wall 25a, 28a Bottom part wall 25b, 28b Side part Wall 25c, 28c Lower cylindrical wall 26, 29 Adhesive 28d Joining inner cylinder wall 30 Injection hole 31 Solvent temporary adhesion part

Claims (5)

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 coupled to the rotating shaft, and the outer peripheral ends of the vanes are coupled 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 disposed at the upper part of the housing and rotatably supporting 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;
A rotor disposed on the outer lower portion of the housing and rotating the impeller through magnetic coupling with the annular coupling portion;
In the turbo blood pump in which the lower end edge of the vane is inclined with respect to the rotation axis so as to follow an upward conical surface,
The housing is divided into two parts, an upper member on the side including the inlet port and the outlet port and a lower member on the side including the base,
The peripheral part of the upper member extends downward to form a cylindrical joining cylindrical wall;
The lower member includes a bottom wall that forms the bottom of the pump chamber including the pedestal, and a side wall that forms a part of the side of the pump chamber and extends obliquely upward and outward,
The peripheral portion of the side wall of the lower member is fitted inside the proximal end portion of the joined cylindrical wall of the upper member,
In the place where the peripheral edge of the side wall abuts on the base end of the joining cylindrical wall, a concave portion formed between the side wall and the joining cylindrical wall is filled with an adhesive, and the upper member A turbo blood pump, wherein the lower member is joined.   The turbo blood pump according to claim 1, wherein an upper surface of the pedestal and a bottom wall of the housing around the pedestal are formed in a conical surface along a lower end edge of the vane.   The turbo blood pump according to claim 1, wherein a recess for arranging the rotor is formed by the bottom wall of the lower member. It is a manufacturing method of the turbo type blood pump according to claim 1,
The impeller is disposed between the upper member and the lower member of the housing, and a peripheral edge of the side wall of the lower member so that the rotating shaft is supported by the upper bearing and the lower bearing Fitting the inside of the base end of the joined cylindrical wall of the upper member,
At the place where the peripheral edge of the side wall abuts on the base end of the joining cylindrical wall, the concave portion formed between the side wall and the joining cylindrical wall is filled with an adhesive, and the upper member A method for manufacturing a turbo blood pump, comprising joining the lower member. After forming a fitting body in which the peripheral edge portion of the side wall is fitted inside the proximal end portion of the joining cylindrical wall,
The turbo type according to claim 4, wherein the fitting body is disposed so that the rotation shaft is directed in the vertical direction and the lower member is positioned above the upper member, and the adhesive is filled in the concave portion. A method for manufacturing a blood pump.

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