JP2014114784A - Turbo blood pump and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a turbo blood pump which has an impeller structure capable of applying adhesive for bonding impeller upper and lower members without depending on an application process.SOLUTION: An impeller 5A is composed of: an impeller upper material 20 in which a plurality of vanes 6, an annular connection part 30 and a rotation shaft 7 are integrated into one body; and an impeller lower member 31 which is fitted to an inner peripheral part and an outer peripheral part from the lower side and forms an annular space 21. The annular connection part and the impeller lower member are bonded with adhesive charged onto an area containing fitting portions of the inner peripheral part and the outer peripheral part. A plurality of driven magnets 10 are attached into the annular space and magnetic connection is formed between driving magnet attached to a rotor and the driven magnets. The annular space is formed of a circumferential channel which is penetrated over the whole circumference of the impeller and is provided with a plurality of communication path open holes 32, 33 at least on the impeller lower member to communicate the annular space and an outer space.

Description

  The present invention relates to a turbo-type blood pump that causes a centrifugal force to be applied to the blood by the rotation of the impeller to cause it to flow, and more particularly to an improvement in the structure of the impeller.

  A blood pump is indispensable for an extracorporeal blood circulation circuit using a heart-lung machine. 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 cross-sectional structure as shown in FIG. The housing 1 includes an upper half 1a and a lower half 1b, and a pump chamber 2 for allowing blood to flow therethrough is formed therein. 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, and an impeller 5 is disposed in the pump chamber 2.

  The impeller 5 includes six vanes 6, a rotating shaft 7 to which at least a part of the inner peripheral ends of the vanes 6 are coupled, an annular connecting portion 8 to which the outer peripheral ends of the vanes 6 are coupled, and a lower portion of the annular connecting portion 8. The impeller lower member 9 is attached to. The vane 6 is inclined with respect to the rotating shaft 7 and constitutes a mixed flow pump. Since the lower impeller member 9 has an annular recess opened upward, an annular space extending along the circumferential direction of the annular connecting portion 8 is formed between the annular connecting portion 8 and the lower impeller member 9. In the annular space, six columnar driven magnets 10 are dispersed and held in the circumferential direction.

  A pedestal 11 having a cylindrical outer peripheral surface formed by projecting the bottom wall upward is formed at the center of the lower half 1b of the housing 1, and the inner peripheral surfaces of the annular connecting portion 8 and the impeller lower member 9 are It is disposed in a surrounding cylindrical space region. A lower bearing 12 is provided at the upper center of the pedestal 11, and supports the rotating shaft 7 together with the upper bearing 13 disposed at the lower end of the inlet port 3.

  FIG. 11 shows a perspective view of the impeller 5 as seen from above. The six vanes 6 (FIG. 10) include main vanes 6a and shorter sub vanes 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 free end at the center side, and is connected to the annular connecting portion 8 only at the peripheral side end. The impeller 5 further includes a sealing member 14 provided at the lower portion of the vane 6. The sealing member 14 seals the lower region of the vane 6, leaving a partial opening 15 (see FIG. 10) around the rotating shaft 7, thereby forming a thrombus in the vicinity of the lower bearing 12. Can be suppressed.

  As shown in FIG. 10, a rotor 16 is disposed at the lower part of the housing 1. The rotor 16 has a structure in which a substantially cylindrical magnetic coupling portion 18 is provided on the drive shaft 17. The drive shaft 17 is rotatably supported by a mechanism (not shown) and is driven to rotate by a motor or the like. The positional relationship between the rotor 16 and the housing 1 is kept constant by elements not shown. Six cylindrical drive magnets 19 are arranged in the circumferential direction on the upper surface of the magnetic coupling portion 18, and the rotation of the rotor 16 is transmitted to the impeller 5 through magnetic coupling with the driven magnet 10.

  The cross-sectional structure of the impeller 5 will be described in more detail with reference to FIGS. As shown in FIG. 12, the impeller 5 includes an impeller upper member 20 in which a vane 6, a rotating shaft 7, and an annular connecting portion 8 are integrated, and an impeller lower member 9 that forms a lower structure of the annular connecting portion 8. The As described above, the driven magnet 10 is mounted in the annular space 21 formed between the annular connecting portion 8 and the impeller lower member 9. In FIG. 12, only the shape along the main vane 6a shown in FIG. 11 is shown.

  As clearly shown in FIG. 14, the impeller lower member 9 includes an outer peripheral wall 9a, an inner peripheral wall 9b, and a bottom wall 9c therebetween, thereby forming an annular recess. An annular space 21 is formed by the upper end portions of the outer peripheral wall 9a and the inner peripheral wall 9b and the outer peripheral edge portion and the inner peripheral edge portion of the annular connecting portion 8 abutting and fitting with each other. Further, the annular connecting portion 8 and the lower impeller member 9 are joined by the adhesive 22 filled in the region including the fitting portion.

  When assembling the impeller 5, the driven magnet 10 is attached, the impeller upper member 20 and the impeller lower member 9 are fitted, and bonded by an adhesive such as urethane resin. Although it is necessary to perform joining at both the inner peripheral edge and the outer peripheral edge of the annular connecting portion 8, ultrasonic welding is difficult due to the complexity of the shape of the joint, and bonding with an adhesive must be employed. I don't get it. In order to facilitate joining with an adhesive, the impeller upper member 20 and the impeller lower member 9 have a structure as described below with reference to FIGS.

  FIG. 13 is a perspective view of the impeller upper member 20 as viewed from below. FIG. 14 is a perspective view of the impeller lower member 9 as viewed from above. However, in order to simplify the description and make it easy to see, the sealing member 14 is shown in a removed state.

  As shown in FIG. 13, an inner positioning protrusion 23 is provided on the back surface of the annular connecting portion 8 with a predetermined distance d from the inner peripheral edge thereof. The inner positioning projection 23 is used to position the driven magnet 10 by abutting on the peripheral surface thereof from the inner side in the radial direction of the annular connecting portion 8. An outer peripheral edge convex portion 24 is provided on the outer peripheral edge of the annular connecting portion 8, and an inner peripheral edge convex portion 25 is provided on the inner peripheral edge. An outer peripheral groove 26 having a predetermined width is formed along the outer peripheral edge of the annular connecting portion 8.

  An outer positioning projection 27 is provided in the annular recess on the bottom wall 9 c of the lower impeller member 9 shown in FIG. 14, and the driven magnet 10 is positioned in cooperation with the inner positioning projection 23 of the annular coupling portion 8. It has become. That is, the outer positioning protrusion 27 abuts on the outer peripheral surface of the driven magnet 10 from the outside, and positions the driven magnet 10 with the inner positioning protrusion 23 of the annular coupling portion 8.

  In FIG. 15, the structure of the principal part of the cyclic | annular connection part 8 is shown in detail in a cross section. As shown in FIG. 15, an outer peripheral edge convex portion 28 is provided on the upper edge portion of the outer peripheral wall 9a of the lower impeller member 9, and an inner peripheral edge convex portion 29 is provided on the upper edge portion of the inner peripheral wall 9b. . The outer peripheral convex portion 24 of the annular connecting portion 8 and the outer peripheral convex portion 28 of the lower impeller member 9, and the inner peripheral convex portion 25 of the annular connecting portion 8 and the inner peripheral convex portion 29 of the impeller lower member 9 are engaged. As a result, the annular connecting portion 8 and the impeller lower member 9 are fitted together to form an annular space 21.

  The step of attaching the impeller upper member 20 and the impeller lower member 9 having the above-described configuration with the driven magnet 10 attached thereto is performed as follows. First, as shown in FIG. 16, the driven magnet 10 is positioned and placed on the lower impeller member 9 by the outer positioning protrusion 27, and an adhesive 22 such as urethane resin is filled in the annular recess. Next, after the impeller upper member 20 is fitted on the impeller lower member 9, the impeller upper member 20 and the impeller lower member 9 are turned upside down and allowed to stand. In this state, the adhesive 22 is solidified.

  By causing the impeller upper member 20 and the impeller lower member 9 to be turned upside down, the adhesive 22 moves to the impeller upper member 20 side by its own weight. For this reason, the area | region including the fitting location of the outer peripheral wall 9a of the impeller lower member 9 and the inner peripheral wall 9b, and the annular connection part 8 is buried in the adhesive agent 22, and an airtight state is ensured.

  In the annular connecting portion 8, the inner positioning projection 23 is provided at a predetermined distance d from the inner peripheral edge of the annular connecting portion 8, the outer peripheral groove 26 is formed, and the impeller lower member 9 has an annular shape. By forming the concave portion, a coating allowance for the adhesive 22 for joining the annular connecting portion 8 and the lower impeller member 9 is sufficiently secured.

JP 2012-193659 A

  However, the turbo blood pump described in Patent Document 1 requires a step of applying an adhesive to the entire surface of the lower impeller member 9 in the manufacturing process, and it takes time to apply the adhesive. Is required. Also, if the adhesive sticks out of the part other than the part where the adhesive is required, it is necessary to remove the adhesive. However, since the member is small or the shape is complicated, the removal work is difficult and skillful. Cost.

  Therefore, when the manufacturing method disclosed in Patent Document 1 is applied to the process of assembling a large number of impellers at a time, the bonding process depends on the skill level of the operator. It is difficult to mechanize the process.

  In consideration of the above problems, the present invention has an impeller structure capable of applying an adhesive for joining the impeller upper and lower members without depending on the coating process, and avoids complications. An object of the present invention is to provide a turbo blood pump that can be manufactured without requiring skill.

  The present invention also provides a method for manufacturing a turbo-type blood pump that can apply such an impeller structure to produce an impeller in a good bonded state by a process that is easy to mechanize while avoiding complexity. For the purpose.

  The turbo blood pump of the present invention has a pump chamber, a housing provided with an inlet port at an upper portion and an outlet port at a side portion, a plurality of vanes, an annular connecting portion in which outer peripheral ends of the vanes are coupled, and An impeller having a rotation shaft coupled to inner peripheral ends of at least some of the plurality of vanes, a plurality of driven magnets being distributed in a circumferential direction of the annular coupling portion, and a bottom wall of the housing A pedestal having a cylindrical outer peripheral surface formed to protrude upward, and disposed in a cylindrical space region surrounded by an inner peripheral surface of the annular coupling portion; an upper inner surface of the housing; and an upper surface of the pedestal A plurality of driving magnets mounted on the outer periphery of the housing, distributed in the circumferential direction, and mounted on the driven magnet; The driving magnet And a rotor for rotating said impeller via a magnetic coupling between the. The impeller is fitted into the impeller upper member in which the vane, the annular connecting portion, and the rotating shaft are integrated, and the inner peripheral edge and the outer peripheral edge of the annular connecting portion from below to form an annular space. It is constituted by an impeller lower member, and the annular connecting portion and the impeller lower member are joined by an adhesive filled in a region including a fitting portion of the inner peripheral edge portion and the outer peripheral edge portion, and the driven space is moved to the annular space. A magnet is installed.

  In order to solve the above-described problems, in the turbo blood pump of the present invention, the annular space forms a circumferential flow path penetrating the entire circumference of the impeller, and at least a plurality of communication passages in the impeller lower member An opening is provided, and the annular space communicates with the external space.

  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 driven magnet is mounted in the annular space, and the impeller upper member and the impeller lower member are connected to each other. An impeller joining step for joining, and in the impeller joining step, the driven magnet is positioned and arranged on the impeller upper member or the impeller lower member, and then the inner peripheral edge portion and the outer peripheral edge portion of the annular coupling portion The upper end portion of the impeller lower member is fitted to the opening, a part of the communication passage openings are opened, and the adhesive is filled into the annular space from the other communication passage openings. It is characterized by being cured.

  According to the turbo blood pump of the above configuration, the annular space forms a circumferential flow path penetrating the entire circumference of the impeller, and a plurality of communication passage openings are provided to communicate the annular space with the external space. Therefore, the adhesive can be easily filled over the entire annular space through the communication passage opening. Therefore, it is possible to employ a process of injecting the adhesive with the impeller upper and lower members fitted together without depending on the process of applying the adhesive. As a result, the bonding operation can be easily performed, and the mechanization of a process for bonding a large number of impellers at a time is facilitated regardless of the skill level of the operator.

  Further, according to the turbo blood pump manufacturing method having the above-described configuration, with the impeller lower member and the annular coupling portion fitted to each other, some communication passage openings are opened, and other communication passage openings are opened. By filling the annular space with the adhesive, air is discharged from the open communication passage opening. Thereby, the filling of the adhesive can be performed extremely efficiently in a sufficiently uniform state, and the mechanization of a process for bonding a large number of impellers at a time becomes easy. In addition, in the filling process of the adhesive, it is easy to visually confirm that the filling of the adhesive into the annular space has been completed by observing the leakage of the adhesive from the open communication passage opening on the opened side. Can do. Thereby, the trouble for confirming an adhesion state is eliminated.

The top view of the impeller of the turbo type blood pump in Embodiment 1 of this invention Front view of the impeller Sectional view along the AA line in FIG. 1 of the impeller Sectional drawing which shows the process of joining the impeller upper member and impeller lower member of the impeller Sectional drawing of the impeller of the turbo type blood pump in Embodiment 2 of this invention The perspective view which looked at the impeller lower member of the impeller from the upper part Sectional drawing which shows the process of joining the impeller upper member and impeller lower member of the impeller Sectional drawing which shows the 1st example of the impeller formation body for enforcing the manufacturing method of the turbo type blood pump in Embodiment 3 of this invention Sectional drawing which shows the 2nd example of the impeller formation body for enforcing the manufacturing method of the turbo type blood pump in the embodiment Sectional view of a conventional turbo blood pump Perspective view of impeller of turbo type blood pump Cross section of the impeller The perspective view which looked at the impeller upper member of the impeller from the lower part The perspective view which looked at the impeller lower member of the impeller from the upper part Sectional drawing which shows the principal part of the impeller The perspective view which shows 1 process of the manufacturing method of the impeller

  The turbo blood pump of the present invention may be configured such that, in the above-described configuration, a pair of the communication passage openings are provided and are arranged at positions that are symmetrical with each other in the radial direction with respect to the center of the impeller. Thereby, it is possible to perform the most efficient and uniform filling of the adhesive into the fitting portion between the annular connecting portion and the impeller lower member, while having the simplest structure.

  The turbo blood pump manufacturing method of the present invention is the above-described configuration, wherein the pair of communication passage openings are provided at positions that are symmetrical to each other in the radial direction with respect to the center of the impeller, and in the impeller joining step, One of the pair of communication passage openings can be opened, and the adhesive can be filled from the other communication passage opening. Thereby, it is possible to perform the most efficient and uniform filling of the adhesive into the fitting portion between the annular connecting portion and the lower impeller member.

  In addition, an injection tube portion that is held by at least one of the annular connecting portion and the impeller lower member and has a lumen that communicates with the communication passage opening, and in the impeller joining step, the injection tube portion via the injection tube portion, It is possible to fill the adhesive and remove the injection tube portion after the adhesive is cured. By providing an injection tube, a dedicated jig for filling the adhesive is not required, and positioning with the nozzle for filling the adhesive with respect to the opening of the communication passage is easy, and efficient production is achieved. It is easy and suitable for mass production.

  Further, the outer end of the injection tube portion can be provided to extend outward from the outer peripheral edge of the impeller. Thereby, when it fills with an adhesive agent, it becomes difficult to generate | occur | produce a bubble in cyclic | annular space, and it can improve the reliability of adhesion | attachment.

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

<Embodiment 1>
A turbo blood pump according to Embodiment 1 of the present invention will be described with reference to FIGS. However, the overall structure of the turbo blood pump is basically the same as that of the conventional example shown in FIGS. The present embodiment is characterized by the structure of the impeller and the manufacturing process thereof, and other elements are the same as those of the above-described conventional example. Accordingly, in the following description, only the impeller will be described, FIG. 1 is a plan view of the impeller 5A, FIG. 2 is a front view of the impeller 5A, and FIG. 3 is a cross-sectional view taken along line AA in FIG. . Also, elements similar to those shown in FIGS. 10 to 15 are denoted by the same reference numerals, and description thereof will not be repeated.

  As shown in FIGS. 1 to 3, the impeller 5 </ b> A is fitted from below to the impeller upper member 20 in which the vane 6, the annular coupling portion 30, and the rotating shaft 7 are integrated, and the inner and outer peripheral edge portions of the annular coupling portion 30. And an impeller lower member 31 that forms the annular space 21.

  As shown in FIG. 3, the lower impeller member 31 has an outer peripheral wall 31a, an inner peripheral wall 31b, and a bottom wall 31c therebetween, thereby forming an annular recess. An annular space 21 is formed by the upper end portions of the outer peripheral wall 31a and the inner peripheral wall 31b and the outer peripheral edge portion and the inner peripheral edge portion of the annular connecting portion 30 coming into contact with each other. The annular space 21 forms a circumferential flow path that penetrates the entire circumference of the annular coupling portion 30, that is, a flow path that allows the adhesive to flow over the entire circumference. And the annular connection part 30 and the impeller lower member 31 are joined by the adhesive agent 22 with which the area | region containing a mutual fitting location was filled.

  An opening spanning the outer peripheral edge of the annular connecting portion 30 and the outer peripheral wall 31a of the impeller lower member 31 is formed, and a pair of communication passage openings 32 and 33 are provided to communicate the annular space 21 with the external space. As shown in FIG. 1, the pair of communication passage openings 32 and 33 are disposed at positions that are symmetrical with each other in the radial direction with respect to the center of the impeller 5 </ b> A. In FIG. 2 and FIG. 3, the communication passage openings 32 and 33 are formed across both the annular connecting portion 30 and the impeller lower member 31, but it is sufficient that they are formed at least in the impeller lower member 31. Further, the number of communication passage openings is not limited to a pair, and a larger number may be provided.

  The adhesive 22 is filled in the annular space 21 using the communication passage openings 32 and 33 (see FIG. 3). Note that the adhesive 22 is actually filled in the communication passage openings 32 and 33, but in order to clarify the illustration of the communication passage openings 32 and 33, FIG. Illustration of 22 is omitted. As in the state shown in FIG. 15, the annular coupling portion 30 and the lower impeller member 31 are joined by the adhesive 22 filled in the fitting portion. In FIG. 15, the fitting part means a part where the outer peripheral convex part 24 and the outer peripheral convex part 28, and the inner peripheral convex part 25 and the inner peripheral convex part 29 are fitted to each other.

  An impeller joining process for assembling the impeller 5A having the above configuration will be described with reference to FIG. Through this process, the driven magnet 10 is mounted in the annular space 21 (not shown in FIG. 4), and the impeller upper member 20 and the impeller lower member 31 are joined.

  First, the driven magnet 10 is positioned with respect to the lower impeller member 31 as in the conventional example shown in FIG. Next, unlike the conventional example, the impeller upper member 20 is fitted onto the impeller lower member 31 without filling the adhesive 22. And as shown in FIG. 4, the impeller upper member 20 and the impeller lower member 31 are turned upside down and hold | maintained. Alternatively, the driven magnet 10 may be positioned with respect to the impeller upper member 20 instead of the impeller lower member 31. In this case, the impeller upper member 20 is held upside down as shown in FIG. 4 and the driven magnet 10 is positioned and placed. The positioning can be performed by contacting the inner positioning projection 23 shown in FIG. Next, the impeller lower member 31 is fitted onto the impeller upper member 20.

  In the state shown in FIG. 4, the tip of the nozzle 34 is attached to the communication passage openings 32 and 33, and the adhesive 22 such as urethane resin is injected from the nozzle 34 inserted into one of the communication passage openings 32 and 33. At that time, the other nozzle 34 is kept open. The injected adhesive 22 divides the annular space 21 in two directions and flows toward the other of the communication passage openings 32 and 33. With the injection of the adhesive 22, air is discharged from the other open nozzle 34, and the adhesive 22 is easily filled into the annular space 21.

  In this process, by observing the leakage of the adhesive 22 from the nozzle 34 on the air discharge side, it is possible to easily recognize that the filling of the adhesive 22 into the annular space 21 has been completed. . Therefore, the troublesomeness for confirming the adhesion state is eliminated.

  Note that the nozzle 34 on the air discharge side is not always necessary. However, it is effective to arrange the nozzle 34 in order to prevent the adhesive 22 leaking from the communication passage opening 32 or 33 from adhering to the outer surface of the impeller 5A. That is, excess adhesive 22 is discharged into the nozzle 34 and is removed along with the removal of the nozzle 34 from the communication passage opening 32 or 33. Therefore, the process of removing the excess adhesive 22 adhering to the outer surface of the impeller 5A is unnecessary.

  After filling the adhesive 22 as described above, the adhesive 22 is cured in a state where the impeller upper member 20 and the impeller lower member 31 are turned upside down. Thereby, the area | region including the fitting location of the inner and outer periphery part of the annular connection part 30 and the impeller lower member 31 can be reliably joined by the adhesive agent 22.

  However, it is not essential that the impeller upper member 20 and the impeller lower member 31 are turned upside down. This is because, even when the impeller upper member 20 and the impeller lower member 31 are in an upright state, the region including the fitting portion of the inner and outer peripheral edge portions of the annular connecting portion 30 and the impeller lower member 31 is filled with the adhesive 22 filled. This is because the bonding is surely performed if the structure is covered. Alternatively, by sufficiently increasing the filling amount of the adhesive 22, it is possible to reliably perform bonding even in an upright state.

  As shown in FIG. 1, the pair of communication passage openings 32 and 33 are disposed at positions that are symmetrical to each other in the radial direction with respect to the center of the impeller 5A. With this arrangement, the adhesive 22 that is injected from one of the communication passage openings 32 and 33 and flows in two ways in the annular space 21 flows most efficiently in the annular space 21, and the communication passage openings 32, The other of 33 can be reached. As a result, it is possible to make the filling of the adhesive 22 into the region including the fitting locations of the inner and outer peripheral edge portions of the annular connecting portion 30 and the impeller lower member 31 sufficiently uniform.

<Embodiment 2>
The structure of impeller 5B that constitutes the turbo blood pump according to the second embodiment of the present invention and the manufacturing method thereof will be described with reference to FIGS. The present embodiment is characterized in that the arrangement of the communication passage openings 32 and 33 in the first embodiment is changed. FIG. 5 is a cross-sectional view of the impeller 5B.

  The impeller 5 </ b> B is an impeller upper member 20 in which the vane 6, the annular coupling portion 8, and the rotary shaft 7 are integrated, and an impeller bottom that is fitted to the inner and outer peripheral edge portions of the annular coupling portion 8 from below to form an annular space 21. The member 35 is configured. The impeller lower member 35 includes an outer peripheral wall 35a that forms an annular recess, an inner peripheral wall 35b, and a bottom wall 35c therebetween. An annular space 21 is formed by the upper end portions of the outer peripheral wall 35a and the inner peripheral wall 35b and the outer peripheral edge portion and the inner peripheral edge portion of the annular connecting portion 8 coming into contact with each other.

  In the present embodiment, a pair of communication passage openings 36 and 37 are provided in the bottom wall 35c of the impeller lower member 35, and the annular space 21 is communicated with the external space. As in the first embodiment, the pair of communication passage openings 36 and 37 are arranged at positions that are symmetrical to each other in the radial direction with respect to the center of the impeller 5B. FIG. 6 is a perspective view showing a state where the communication passage openings 36 and 37 are provided in the bottom wall 35 c of the impeller lower member 35.

  An impeller joining process for assembling the impeller 5B having the above configuration will be described with reference to FIG. First, the impeller upper member 20 is held upside down as shown in FIG. 7, and the driven magnet 10 is positioned and placed. Next, the impeller lower member 35 is fitted onto the impeller upper member 20. In this state, the tip of the nozzle 38 is attached to the communication passage openings 36 and 37 from above, and the adhesive 22 such as urethane resin is injected from one nozzle 38. At that time, the other nozzle 38 is kept open. The injected adhesive 22 divides the annular space 21 into two hands and flows toward the other of the communication passage openings 36 and 37. With the injection of the adhesive 22, air is discharged from the other opened nozzle 38 and the adhesive 22 is easily filled into the annular space 21.

  In the case of the present embodiment, it is extremely desirable that the impeller upper member 20 and the impeller lower member 31 are turned upside down. This is because the communication passage openings 36 and 37 are positioned on the bottom wall 35c of the impeller lower member 35, which is advantageous for easy filling of the adhesive or discharging the air in the annular space 21. is there.

  By observing the leakage of the adhesive 22 from the nozzle 38 on the air discharge side, it can be easily confirmed that the filling of the adhesive 22 into the annular space 21 is completed. Further, the nozzle 38 on the air discharge side is the same as that in the first embodiment.

<Embodiment 3>
A method for manufacturing a turbo blood pump according to Embodiment 3 of the present invention will be described with reference to FIGS. This embodiment is characterized by a process for manufacturing an impeller having the same configuration as the impellers 5A and 5B of the first and second embodiments.

  FIG. 8 is a sectional view showing an impeller forming body 5C of the first example for carrying out the manufacturing method of the present embodiment. Similar to the impeller 5A of the first embodiment, the impeller forming body 5C has a structure in which the impeller lower member 39 has communication passage openings 32 and 33, and the injection pipe portion 40 is provided in each portion. Other structures are the same as the impeller 5A. In the figure, the injection tube portion 40 is formed and held integrally with the outer peripheral wall 39a of the impeller lower member 39, and has a lumen communicating with the communication passage openings 32 and 33. In addition, the injection pipe part 40 can also be made into the structure integrally formed with respect to the outer peripheral part of the cyclic | annular connection part 30. FIG.

  The injection tube section 40 is used for the same application as the nozzle 34 shown in FIG. That is, in the impeller joining step, although not shown, first, the impeller upper member 20 is held upside down and the driven magnet 10 is positioned and placed. Next, the impeller lower member 39 is fitted onto the impeller upper member 20.

  In this state, the adhesive 22 such as urethane resin is injected from one injection tube portion 40. At that time, the other injection tube section 40 is kept open. The injected adhesive 22 divides the annular space 21 into two hands and flows toward the other of the communication passage openings 32 and 33. By observing the leakage of the adhesive 22 from the injection pipe portion 40 on the side from which air is discharged, the filling of the adhesive 22 into the annular space 21 is completed, and the filling of the adhesive 22 is completed. Then, after the adhesive 22 is cured, the injection tube portion 40 is removed by breaking or cutting.

  Further, the outer end portion of the injection pipe portion 40 extends outward from the outer peripheral surface of the impeller lower member 39. Thereby, when the adhesive 22 is filled, bubbles are less likely to be generated in the annular space 21, and the adhesion reliability can be improved. In addition, by providing the injection tube portion 40, a dedicated jig for filling the adhesive 22 is not required, and the communication passage openings 32 and 33 can be aligned with the nozzle for filling the adhesive 22. It becomes easy, efficient production is easy, and it is suitable for mass production.

  FIG. 9 is a cross-sectional view showing an impeller forming body 5D of the second example for carrying out the manufacturing method of the present embodiment. Similar to the impeller 5B of the second embodiment, the impeller forming body 5D has a structure in which the impeller lower member 41 has communication passage openings 37 and 38, and the injection pipe portion 42 is provided in each portion. Other structures are the same as the impeller 5B. In the figure, the injection tube portion 42 is formed and held integrally with the bottom wall 41 c of the impeller lower member 41 and has a lumen communicating with the communication passage openings 37 and 38. In addition, the injection pipe part 42 can also be made into the structure integrally formed with respect to the outer peripheral part of the cyclic | annular connection part 8. FIG.

  The injection pipe part 42 is used for the same application as the nozzle 38 shown in FIG. That is, in the impeller joining step, although not shown, first, the impeller upper member 20 is held upside down and the driven magnet 10 is positioned and placed. Next, the impeller lower member 41 is fitted on the impeller upper member 20.

  In this state, the adhesive 22 such as urethane resin is injected from one injection tube portion 42. At that time, the other injection tube section 42 is kept open. The injected adhesive 22 divides the annular space 21 into two hands and flows toward the other of the communication passage openings 37 and 38. By observing the leakage of the adhesive 22 from the injection pipe portion 42 on the air discharge side, the filling of the adhesive 22 into the annular space 21 is completed, and the filling of the adhesive 22 is completed. Then, after the adhesive 22 is cured, the injection tube portion 42 is removed by breaking or cutting. By providing the injection tube portion 42, the same effect as in the case of the impeller forming body 5C of the first example can be obtained.

  The turbo blood pump of the present invention can produce an impeller by a simple manufacturing process that does not depend on the skill level of an operator, and is useful for reducing the manufacturing cost of a blood pump used for extracorporeal blood circulation in an oxygenator or the like. .

DESCRIPTION OF SYMBOLS 1 Housing 2 Pump chamber 3 Inlet port 4 Outlet port 5, 5A-5D Impeller 6 Vane 6a Main vane 6b Sub vane 7 Rotating shaft 8, 30 Annular connection part 9, 31, 35, 39, 41 Impeller lower member 9a, 31a, 35a, 39a, 41a Outer peripheral wall 9b, 31b, 35b, 39b, 41b Inner peripheral wall 9c, 31c, 35c, 39c, 41c Bottom wall 10 Driven magnet 11 Base 12 Lower bearing 13 Upper bearing 14 Closing member 15 Opening portion 16 Rotor 17 Drive Shaft 18 Magnetic coupling portion 19 Drive magnet 20 Impeller upper member 21 Annular space 22 Adhesive 23 Inner positioning projection 24, 28 Outer peripheral projection 25, 29 Inner peripheral projection 26 Annular recess 27 Outer positioning projection 32, 33, 36, 37 Communication passage opening 34, 38 Nozzle 40, 42 Injection pipe section

Claims (6)

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 plurality of vanes, an annular connecting portion to which the outer peripheral ends of the vanes are coupled, and a rotating shaft to which at least some of the inner peripheral ends of the plurality of vanes are coupled, distributed in a circumferential direction of the annular connecting portions; An impeller on which a plurality of driven magnets are arranged;
A pedestal having a cylindrical outer peripheral surface formed by projecting the bottom wall of the housing upward, and disposed in a cylindrical space region surrounded by an inner peripheral surface of the annular coupling portion;
A bearing that is provided on each of the upper inner surface of the housing and the upper surface of the pedestal and supports upper and lower ends of the rotating shaft of the impeller;
A rotor disposed on the outer lower portion of the housing, having a plurality of drive magnets distributed in the circumferential direction, and rotating the impeller through magnetic coupling between the driven magnets and the drive magnets; ,
The impeller is fitted into the impeller upper member in which the vane, the annular connecting portion, and the rotating shaft are integrated, and the inner peripheral edge and the outer peripheral edge of the annular connecting portion from below to form an annular space. It is composed of an impeller lower member,
The annular connecting portion and the impeller lower member are joined by an adhesive filled in a region including a fitting portion of the inner peripheral edge portion and the outer peripheral edge portion, and the driven magnet is mounted in the annular space. In the blood pump
The annular space forms a circumferential flow path penetrating the entire circumference of the impeller,
A turbo blood pump, wherein a plurality of communication passage openings are provided in at least the impeller lower member, and the annular space and the external space are communicated with each other.   2. The turbo blood pump according to claim 1, wherein a pair of the communication passage openings are provided and are arranged at positions that are symmetrical with each other in the radial direction with respect to the center of the impeller. A method for producing the turbo blood pump according to claim 1,
The impeller joining step of attaching the driven magnet in the annular space and joining the impeller upper member and the impeller lower member includes the impeller joining step,
After positioning and arranging the driven magnet on the impeller upper member or the impeller lower member,
The upper end of the impeller lower member is fitted to the inner peripheral edge and the outer peripheral edge of the annular coupling part,
A method for manufacturing a turbo blood pump, wherein some of the communication passage openings are opened, and the adhesive is filled into the annular space from the other communication passage openings and cured. A pair of communication passage openings are provided at positions symmetrical to each other in the radial direction with respect to the center of the impeller,
The method for manufacturing a turbo blood pump according to claim 3, wherein in the impeller joining step, one of the pair of communication passage openings is opened, and the adhesive is filled from the other communication passage opening. An injection tube portion that is held by at least one of the annular connecting portion and the lower impeller member and has a lumen communicating with the communication passage opening;
In the impeller joining step, the adhesive is filled through the injection tube portion,
The method for manufacturing a turbo blood pump according to claim 3 or 4, wherein the injection tube portion is removed after the adhesive is cured.   The method for manufacturing a turbo blood pump according to claim 5, wherein an outer end of the injection tube portion is provided to extend outward from an outer peripheral edge of the impeller.

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