Blood purification device

Abstract

To improve workability when attaching / detaching a tube to / from a blood pump.SOLUTION: In a blood purification device 1 according to the present disclosure, a blood pump 20 comprises a shaft part 21, a roller support member 22, a plurality of rollers 23, a stator 24, a first fixing part 28, and a second fixing part 29. The shaft part 21 extends in an axial direction A, and the axial direction A is obliquely inclined with respect to a vertical direction Y. The stator 24 comprises a guide surface 241 extending in an arc shape along a circumferential direction when viewed from the axial direction A. The first fixing part 28 can fix one end side of a tube 2 arranged along the guide surface 241. The second fixing part 29 can fix the other end side of the tube 2 arranged along the guide surface 241. The first fixing part 28 and the second fixing part 29 are located below a center C in the extending direction of a portion arranged along the guide surface 241 out of the tube 2, and are arranged side by side along a horizontal surface.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present disclosure relates to a blood purification device.

Background Art

[0002] Japanese Patent Application Laid-Open No. 2020-103644 (Patent Document 1) discloses a blood purification device having a blood pump. It is also disclosed that a pump tube may be loaded and attached to the blood pump.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Before performing treatment using a blood purification device, priming is performed on the blood circuit of the blood purification device. Specifically, priming includes the operation of filling the inside of the blood circuit with physiological saline or the like after washing the inside of the blood circuit. By filling the inside of the blood circuit with physiological saline or the like, air in the tubes constituting the blood circuit is removed.

[0005] As disclosed in Patent Document 1, a tube-type roller pump may be used for the blood pump of a blood purification device. In this case, the roller pump is designed in consideration of removing air in the tube during priming. For example, the roller pump is designed such that the axial direction of the rotation axis of the roller pump is parallel to the vertical direction. Alternatively, the roller pump is designed such that the downstream portion of the tube attached to the roller pump is located above the upstream portion. In the blood pump of a conventional blood purification device, the roller pump is designed as described above. Therefore, the workability of attaching and detaching the tube to and from the blood pump is low.

[0006] This disclosure is made in view of the above-mentioned problems and aims to provide a blood purification device that can improve the ease of attaching and detaching tubing to a blood pump. [Means for solving the problem]

[0007] The blood purification device according to this disclosure comprises a blood purifier and a blood pump. The blood pump is capable of transporting blood in a tube to the blood purifier by attaching a flexible tube connected to the blood purifier. The blood pump comprises a shaft, a roller support member, a plurality of rollers, a stator, a first fixing part, and a second fixing part. The shaft extends in the axial direction. The axial direction of the shaft is inclined obliquely with respect to the vertical direction. The shaft is rotatable. The roller support member is attached to the shaft. The plurality of rollers are attached to the roller support member. The plurality of rollers are arranged in a line in the circumferential direction of the shaft when viewed from the axial direction. The stator is positioned radially outward from the shaft relative to the plurality of rollers that are displaced when the shaft rotates. The stator has a guide surface that extends in an arc along the circumferential direction when viewed from the axial direction. The first fixing part is capable of fixing one end of a tube arranged along the guide surface. The second fixing part can fix the other end of the tube that is positioned along the guide surface. The first and second fixing parts are located below the center in the extending direction of the portion of the tube that is positioned along the guide surface, and are aligned along the horizontal plane. [Effects of the Invention]

[0008] Since the first and second fixing parts are located below the center of the extension direction of the portion of the attached tube that is positioned along the guide surface, and are aligned along the horizontal plane, the position of the tube at the guide surface and each fixing point is easily visible when attaching and detaching the tube. This improves the workability of attaching and detaching the tube to the blood pump. In addition, although the first and second fixing parts are aligned along the horizontal plane, the axial direction of the shaft of the blood pump is inclined diagonally with respect to the vertical direction, which reduces the difficulty of removing air from inside the tube during priming compared to when the axial direction of the shaft is perpendicular to the vertical direction. [Brief explanation of the drawing]

[0009] [Figure 1] This is a schematic circuit diagram showing an extracorporeal circulation circuit in a blood purification device according to one embodiment of the present disclosure. [Figure 2] This is a perspective view showing a blood purification device according to one embodiment of this disclosure. [Figure 3] This is a partial front view showing a blood purification device according to one embodiment of the present disclosure. [Figure 4] Figure 3 is a partial side view of the blood purification device, shown from the direction of arrow IV. [Figure 5] Figure 4 is a partial cross-sectional view of the blood purification device, taken from the direction of the VV arrow. [Modes for carrying out the invention]

[0010] Hereinafter, the configuration of a blood purification device according to one embodiment of this disclosure will be described with reference to the drawings. In the following description of the embodiment, the same or corresponding parts in the drawings will be denoted by the same reference numerals, and their descriptions will not be repeated.

[0011] Figure 1 is a schematic circuit diagram showing an extracorporeal circulation circuit in a blood purification device according to one embodiment of the present disclosure. Figure 2 is a perspective view showing a blood purification device according to one embodiment of the present disclosure. As shown in Figures 1 and 2, the blood purification device 1 according to one implementation form of the present disclosure is specifically a blood purification device used in continuous renal replacement therapy (CRRT). However, the blood purification device 1 may be a blood purification device used in continuous hemodiafiltration (CHDF), continuous hemofiltration (CHF), continuous hemodialysis (CHD), and slow continuous ultrafiltration (SCUF).

[0012] The blood purification device 1 comprises a blood purifier 10, a main unit 15, and a blood pump 20.

[0013] The blood purifier 10 contains a semipermeable membrane, for example, made of a hollow fiber membrane, inside. The blood purifier 10 is attached to the main body 15. Flexible tubes 2 are connected to the blood inlet and blood outlet sides of the blood purifier 10, respectively.

[0014] The main body 15 has a front surface 16, an upper surface 17, and a mounting surface 18. The upper surface 17 is connected to the front surface 16. The portion of the upper surface 17 located near the front surface 16 is inclined downward toward the front surface 16. In this embodiment, the mounting surface 18 is composed of the lower ends of a plurality of casters. In this specification, "horizontal surface" refers to a surface parallel to the mounting surface 18.

[0015] The blood pump 20 is a so-called roller pump. The blood pump 20 can transport blood in the tube 2 to the blood purifier 10 by attaching a flexible tube 2 (specifically, the tube 2 connected to the blood inlet side of the blood purifier 10) that is connected to the blood purifier 10.

[0016] The blood pump 20 is provided on the main body 15. Specifically, the blood pump 20 is provided on the main body 15 straddling the front surface 16 and the upper surface 17. The blood pump 20 is located at a distance of 800 mm or more from the mounting surface 18 of the main body 15 in the vertical direction Y.

[0017] FIG. 3 is a partial front view showing a blood purification device according to an embodiment of the present disclosure. FIG. 4 is a partial side view showing the blood purification device of FIG. 3 from the direction of arrow IV. FIG. 5 is a partial cross-sectional view showing the blood purification device of FIG. 4 from the direction of arrow V-V. As shown in FIGS. 3 to 5, the blood pump 20 includes a shaft portion 21, a roller support member 22, a plurality of rollers 23, a stator 24, a first fixing portion 28, and a second fixing portion 29. In FIG. 4, the position of the shaft portion 21 is schematically shown by a broken line. In FIG. 5, a state where the tube 2 is attached to the blood pump 20 is shown.

[0018] The shaft portion 21 is rotatable about the axial direction A. The shaft portion 21 extends in the axial direction A. The axial direction A is inclined obliquely with respect to the vertical direction Y. Thereby, compared with the case where the axial direction A is orthogonal to the vertical direction Y, the difficulty of removing air in the tube 2 during priming is reduced. Also, compared with the case where the axial direction A is parallel to the vertical direction Y, the workability of attaching and detaching the tube 2 is improved.

[0019] It is preferable that the angle formed by the axial direction A and the vertical direction Y is 45 degrees or less. Thereby, during priming, it becomes easier to remove air in the tube 2 (particularly, the center C of the extending direction of the portion arranged along the guide surface 241 of the tube 2 described later). From the viewpoint of facilitating air removal, it is more preferable that the angle formed by the axial direction A and the vertical direction Y is 40 degrees or less, and further preferably 35 degrees or less.

[0020] The axial direction A preferably forms an angle of 15 degrees or more with the vertical direction Y. This further improves the workability of attaching and detaching the tube 2. From the perspective of improving such workability, the angle formed by the axial direction A and the vertical direction Y is more preferably 20 degrees or more, and even more preferably 25 degrees or more.

[0021] The roller support member 22 is attached to the shaft portion 21. The roller support member 22 rotates about the axial direction A as the shaft portion 21 rotates.

[0022] The plurality of rollers 23 are attached to the roller support member 22. The plurality of rollers 23 are arranged side by side in the circumferential direction of the shaft portion 21 as viewed from the axial direction A. The plurality of rollers 23 are displaced circumferentially about the axial direction A as the roller support member 22 rotates.

[0023] The stator 24 is located radially outside the shaft portion 21 and spaced apart from the plurality of rollers 23 that are displaced when the shaft portion 21 rotates. The stator 24 has a guide surface 241. The guide surface 241 has a guide surface 241 that extends in an arc shape along the circumferential direction when viewed from the axial direction A.

[0024] The tube 2 is arranged along the guide surface 241. The plurality of rollers 23 that are displaced press and deform the tube 2 radially outward while being displaced along the circumferential direction. Thereby, the blood in the tube 2 is transported.

[0025] The blood pump 20 further includes a lid portion 25 and a base portion 26. The lid portion 25 is configured to be openable and closable. When the lid portion 25 is in the closed state, at least the shaft portion 21, the roller support member 22, the plurality of rollers 23, and the stator 24 are covered by the lid portion 25. When the lid portion 25 is in the open state, the tube 2 can be attached.

[0026] The base portion 26 faces the cover portion 25 in the axial direction A. The cover portion 25 and the base portion 26 are located on at least both sides of the shaft portion 21, the roller support member 22, the plurality of rollers 23, and the stator 24 in the axial direction A. That is, the shaft portion 21 is supported by the base portion 26. The base portion 26 is positioned so that at least a part of it is exposed to the outside. At least a part of the base portion 26, together with the front surface 16 of the main body portion 15, constitutes the front side of the blood purification device 1.

[0027] Furthermore, the base portion 26 has an outer base portion 261 and an inner base portion 262. The outer base portion 261 is positioned so that at least a part of it is exposed to the outside. The outer base portion 261 is the part of the base portion 26 that is exposed to the outside when the lid portion 25 is closed. The outer base portion 261 may be made of the same material as the part of the main body portion 15 that is on the front surface 16 side of the housing. The inner base portion 262 is the part of the base portion 26 that is not exposed to the outside when the lid portion 25 is closed. In other words, the shaft portion 21 is supported by the inner base portion 262.

[0028] The blood pump 20 further comprises a first fixing part 28 and a second fixing part 29. The first fixing part 28 is capable of fixing one end of the tube 2 positioned along the guide surface 241. The second fixing part 29 is capable of fixing the other end of the tube 2 positioned along the guide surface 241.

[0029] The specific configurations of the first fixing portion 28 and the second fixing portion 29 are not particularly limited, but in this embodiment, the first fixing portion 28 and the second fixing portion 29 are through holes formed by a lid portion 25 and a base portion 26. The first fixing portion 28 and the second fixing portion 29 are positioned so as to be visible from the front side of the blood purification device 1 (i.e., the front 16 side of the main body portion 15).

[0030] The base portion 26 (outer base portion 261) has a first recessed portion 263a and a second recessed portion 263b formed thereon. The first recessed portion 263a and the second recessed portion 263b each extend toward the front side of the blood purification device 1 (i.e., toward the front surface 16 side of the main body portion 15). The lid portion 25 covers the first recessed portion 263a, forming a through hole (first fixing portion 28). Therefore, one end of the tube 2 can be fitted into the first recessed portion 263a by opening the lid portion 25. Consequently, one end of the tube 2 can be attached to the first fixing portion 28. Also, the lid portion 25 covers the second recessed portion 263b, forming a through hole (second fixing portion 29). Therefore, the other end of the tube 2 can be fitted into the second recessed portion 263b by opening the lid portion 25. Consequently, the other end of the tube 2 can be attached to the second fixing part 29.

[0031] Furthermore, the first fixing part 28 and the second fixing part 29 are located below the center C in the direction of extension of the portion of the tube 2 that is positioned along the guide surface 241, and are aligned along the horizontal plane. This configuration makes it easier to see the position of the tube 2 on the guide surface 241 and at each fixing point when attaching and detaching the tube 2. Consequently, the workability of attaching and detaching the tube 2 to the blood pump 20 is improved.

[0032] As shown in Figures 1 and 2, the blood purification device 1 according to one embodiment of the present disclosure may further include a plurality of other pumps 30 for transporting dialysate, replacement fluid, and drainage fluid, respectively. The other pumps 30 may be roller pumps or other types of pumps. The other pumps 30 may have the same configuration as the blood pump 20. However, from the viewpoint of miniaturizing the blood purification device 1, it is preferable that the other pumps 30 are finger-touch type tube pumps.

[0033] [Note] As described above, embodiments of this disclosure include the following disclosures.

[0034] (Composition 1) Blood purifier (10), The blood pump (20) is equipped with a flexible tube (2) connected to the blood purifier (10), which allows the blood in the tube (2) to be transported to the blood purifier (10). The blood pump (20) is A rotatable shaft portion (21) extending in the axial direction (A), with the axial direction (A) being inclined obliquely with respect to the vertical direction (Y), A roller support member (22) attached to the shaft portion (21), A plurality of rollers (23) are attached to the roller support member (22) and are arranged in a line in the circumferential direction of the shaft portion (21) when viewed from the axial direction (A), A stator (24) is positioned radially outward from the shaft (21) relative to the plurality of rollers (23) that are displaced when the shaft (21) rotates, and has a guide surface (241) that extends in an arc shape along the circumferential direction when viewed from the axial direction (A), A first fixing part (28) capable of fixing one end of the tube (2) which is arranged along the guide surface (241), The system includes a second fixing part (29) that can fix the other end of the tube (2) which is positioned along the guide surface (241), The blood purification device (1) is located below the center (C) in the extending direction of the portion of the tube (2) that is arranged along the guide surface (241), and is aligned along the horizontal plane.

[0035] (Configuration 2) The blood purification device (1) according to configuration 1, wherein the axial direction (A) of the shaft portion (21) has an angle of 45 degrees or less with respect to the vertical direction (Y).

[0036] (Composition 3) The blood purification device (1) according to configuration 1 or configuration 2, wherein the axial direction (A) of the shaft portion (21) has an angle of 15 degrees or more with respect to the vertical direction (Y).

[0037] The embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The scope of the invention is indicated by the claims rather than by the foregoing description, and all modifications within the meaning and scope equivalent to the claims are intended. [Explanation of symbols]

[0038] 1 Blood purification device, 2 Tubes, 10 Blood purifier, 15 Main body, 16 Front, 17 Top, 18 Mounting surface, 20 Blood pump, 21 Shaft, 22 Roller support member, 23 Roller, 24 Stator, 241 Guide surface, 25 Cover, 26 Base, 261 Outer base, 262 Inner base, 263a First groove, 263b Second groove, 28 First fixing part, 29 Second fixing part, 30 Other pumps.

Claims

1. It is a blood purification device, A blood purifier, The system includes a blood pump capable of transporting blood from a flexible tube to the blood purifier by attaching the flexible tube connected to the blood purifier, The aforementioned blood pump is A rotatable shaft portion extending in the axial direction, with the axial direction being obliquely inclined with respect to the vertical direction, A roller support member attached to the shaft portion, A plurality of rollers attached to the roller support member and arranged in the circumferential direction of the shaft when viewed from the axial direction, A stator having a guide surface that is positioned radially outward from the shaft portion with respect to the plurality of rollers that are displaced when the shaft portion rotates, and which extends in an arc shape along the circumferential direction when viewed from the axial direction, The system comprises a first fixing portion capable of fixing one end of the tube arranged along the guide surface, and a second fixing portion capable of fixing the other end of the tube arranged along the guide surface. The first and second fixing portions are located below the center in the extending direction of the portion of the tube that is arranged along the guide surface, and are aligned along the horizontal plane. The base and, It further includes a lid, The shaft portion is supported by the base portion, Each of the first and second fixing portions is a through hole formed by the lid portion and the base portion, The blood purification device further comprises a main body that constitutes the front side of the blood purification device, The base portion has an outer base portion which is made of a material that is integrated with the front side portion of the housing of the main body portion. A blood purification device in which the stator is composed of a different material from the outer base.

2. The blood purification device according to claim 1, wherein the axial direction of the shaft portion has an angle of 15 degrees or more and 45 degrees or less with respect to the vertical direction.

3. The base portion has a first recessed portion and a second recessed portion formed therein. The lid portion covers the first recessed portion, thereby forming the through hole which is the first fixing portion. The blood purification device according to claim 1 or claim 2, wherein the lid portion covers the second recessed portion, thereby forming the through hole which is the second fixing portion.

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