Roller pump

Abstract

To reduce generation of noise due to vibrations of a stator.SOLUTION: In a roller pump 1, a stator 50 is configured to be brought into a first state forming a guiding path G and into a second state in which the same displaces in a first direction D1 orthogonal to an axial direction A to make a separation distance from a shaft portion 20 large as compared with the first state. A sliding surface portion 121 is in parallel with the first direction D1 and slide contacts with a corresponding extension stator 52 of a pair of extension stators 52. An extension surface portion 122 extends from the sliding surface portion 121 in the first direction D1, bends so as to approach the other wall portion 12 of a pair of wall portions 12, and is located continuously from the sliding surface portion 121. The stator 50 is engaged with the pair of wall portions 12 while being elastically deformed, in the first state, when the pair of extension stators 52 enters between the respective extension surface portions 122 of the pair of wall portions 12 in a wedge-like manner.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to roller pumps. [Background technology]

[0002] The roller pump disclosed in JP 2017-82644 A (Patent Document 1) compresses and clamps a flexible tube between the outer peripheral surface of a roller and a guide surface, and then rotates the roller support member with a roller support member drive shaft to move the roller, thereby discharging fluid from the tube. The guide surface is provided on a movable side member whose arc-shaped center portion is movable in a direction perpendicular to the axis of the roller support member. The movable side member is slidable between a pump operating position where the tube is clamped between the outer peripheral surface of the roller and a tube attachment / detachment position where it is spaced from the roller. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2017-82644 Summary of the Invention [Problem to be solved by the invention]

[0004] As described in Patent Document 1, a roller pump is known in which the stator that clamps the tube together with the roller is configured to be movable to facilitate attachment and detachment of the tube. However, configuring the stator to be easily movable can result in a gap between the stator and other components. When such a roller pump is operated, the stator vibrates relative to the other components. The vibrating stator is then repeatedly struck against the other components, which can result in noise.

[0005] The present disclosure has been made in consideration of the above-mentioned problems, and aims to provide a roller pump that can reduce noise caused by vibration of the stator. [Means for solving the problem]

[0006] A roller pump according to the present disclosure is capable of transporting liquid within a flexible tube by attaching the pump to the tube. The roller pump includes a main body, a shaft, a roller support member, multiple rollers, and a stator. The shaft is rotatable while supported by the main body. The roller support member is attached to the shaft. The multiple rollers are attached to the roller support member. The multiple rollers are arranged in a line in the circumferential direction of the shaft when viewed in the axial direction of the shaft. The stator has a substantially U-shaped outer shape when viewed in the axial direction. The stator can be positioned to form a guide path for the tube together with the multiple rollers that are displaced when the shaft rotates. The stator is configured to be able to assume a first state and a second state. The first state is a state in which the stator forms a guide path. The second state is a state in which the stator is displaced along a first direction perpendicular to the axial direction, thereby increasing the distance from the shaft compared to the first state. The stator includes a central stator and a pair of extending stators. The central stator forms the guide path by having an arc-shaped curved surface when viewed in the axial direction. The pair of extending stators extend from the central stator along a first direction. The pair of extending stators have continuous inner surfaces at both ends of the curved surface when viewed in the axial direction. The main body portion has a plate-shaped portion and a pair of wall portions. The plate-shaped portion supports the shaft portion and extends in a direction perpendicular to the axial direction. The pair of wall portions extend from the plate-shaped portion along the axial direction. The pair of wall portions are in sliding contact with the pair of extending stators on the side opposite to the inner surfaces of the pair of extending stators. Each of the pair of wall portions has a sliding surface portion and an extension surface portion. The sliding surface portion is parallel to the first direction. The sliding surface portion is in sliding contact with the corresponding one of the pair of extending stators. The extension surface portion extends in the first direction from the sliding surface portion. The extension surface portion bends to approach the other wall portion of the pair of wall portions and is located continuous with the sliding surface portion. When the stator is in the first state, the pair of extended stators are wedged between the extension surface portions of the pair of wall portions, thereby engaging with the pair of wall portions while elastically deforming. [Effects of the Invention]

[0007] According to the present disclosure, while the stator is displaceable, in the first state it elastically deforms and engages with the pair of walls, so that the walls suppress vibration of the stator, thereby reducing noise caused by vibration of the stator. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a side view showing a roller pump according to an embodiment of the present disclosure in a first state; FIG. [Figure 2] 2 is a cross-sectional view of the roller pump of FIG. 1 as seen from the direction of the arrows along line II-II. [Figure 3] 3 is a cross-sectional view of the roller pump of FIG. 1 as seen from the direction of the arrows along line III-III. [Figure 4] FIG. 2 is a side view illustrating a second state of a roller pump according to an embodiment of the present disclosure. [Figure 5] 5 is a cross-sectional view of the roller pump of FIG. 4 as seen from the direction of the arrow VV. [Figure 6] FIG. 10 is a cross-sectional view showing a first state of a roller pump according to a modified example of an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, the configuration of a roller pump according to one embodiment of the present 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 description thereof will not be repeated.

[0010] Fig. 1 is a side view showing a first state of a roller pump according to an embodiment of the present disclosure. Fig. 2 is a cross-sectional view of the roller pump of Fig. 1 as viewed from the direction of the arrows along line II-II. Fig. 3 is a cross-sectional view of the roller pump of Fig. 1 as viewed from the direction of the arrows along line III-III. As shown in Figs. 1 to 3, the roller pump 1 is a pump that can transport a liquid in a flexible tube 2 by attaching the tube 2. Note that only Fig. 2 schematically shows the tube 2 attached to the roller pump 1.

[0011] The roller pump 1 is not particularly limited in its application. The roller pump 1 is attached to, for example, a medical device. An example of such a medical device is a blood purification device. When the roller pump 1 is attached to a blood purification device, the roller pump 1 is used, for example, as a blood pump for transporting a patient's blood to a blood purifier. The blood purification device is used, for example, for continuous renal replacement therapy (CRRT), continuous hemodiafiltration (CHDF), continuous hemofiltration (CHF), continuous hemodialysis (CHD), or slow continuous ultrafiltration (SCUF). The roller pump 1 according to this embodiment preferably has a maximum transportable flow rate of blood in the tube 2 of 200 mL / min or more.

[0012] The roller pump 1 includes a main body 10, a shaft 20, a roller support member 30, a plurality of rollers 40, a stator 50, and a lid 60.

[0013] The main body 10 has a plate-shaped portion 11, a pair of wall portions 12, and a pair of support portions 15. The plate-shaped portion 11 supports the shaft portion 20. The plate-shaped portion 11 extends in a direction perpendicular to the axial direction A of the shaft portion 20. In this way, the shaft portion 20 is rotatable while being supported by the main body 10.

[0014] The pair of wall portions 12 extend from one side of the plate-shaped portion 11 in the axial direction A. The pair of support portions 15 each extend from one side of the plate-shaped portion 11 in the axial direction A. The wall portions 12 and the support portions 15 will be described in detail later.

[0015] The roller support member 30 is attached to the shaft portion 20. A plurality of rollers 40 are attached to the roller support member 30. The rollers 40 are arranged at equal intervals in the circumferential direction of the shaft portion 20 as viewed from the axial direction A of the shaft portion 20 (i.e., the circumferential direction around the rotation center point O of the shaft portion 20 as viewed from the axial direction A). The number of rollers 40 is preferably three or more. In this embodiment, the roller pump 1 is equipped with three rollers 40. That is, as viewed from the axial direction A, the angle α formed by the line segment connecting the center of one roller 40 to the rotation center point O and the line segment connecting the center of another roller 40 adjacent to the one roller 40 to the rotation center point O is 120 degrees.

[0016] The stator 50 has a substantially U-shaped outer shape when viewed from the axial direction A. The stator 50 can be positioned so as to form a guide path G for the tube 2 together with a plurality of rollers 40 that are displaced as the shaft portion 20 rotates.

[0017] FIG. 4 is a side view showing a second state of a roller pump according to an embodiment of the present disclosure. FIG. 5 is a cross-sectional view of the roller pump of FIG. 4, viewed from the direction of the arrows VV. The stator 50 is configured to be able to assume a first state shown in FIGS. 1 to 3 and a second state shown in FIGS. 4 and 5. The first state is a state in which the guide path G is formed. The second state is a state in which the stator 50 is displaced along a first direction D1 perpendicular to the axial direction A, thereby increasing the separation distance from the shaft portion 20 compared to the first state. This allows the tube 2 to be easily attached to the roller pump 1 in the second state.

[0018] As shown in FIGS. 2 and 3, the stator 50 includes a central stator 51 and a pair of extending stators 52.

[0019] The central stator 51 has an arc-shaped curved surface 511 centered on the rotation center point O as viewed from the axial direction A, thereby forming the guide path G. The center of the curved surface 511 is aligned with the rotation center point O in the first direction D1. As viewed from the axial direction A, the angle β formed between a line segment connecting one end of the curved surface 511 to the rotation center point O and a line segment connecting the other end of the curved surface 511 to the rotation center point O is, for example, 100 degrees or more. Furthermore, it is preferable that the angle β is larger than the angle α. This allows any one of the rollers 40 to always be positioned at a constant distance from the curved surface 511 in the radial direction centered on the rotation center point O. Consequently, the tube 2 is always compressed between the roller 40 and the curved surface 511 in the guide path G, and the liquid in the tube 2 is stably transported. For this reason, in this embodiment, the angle β is 120 degrees or more. From the viewpoint of miniaturizing the roller pump 1, it is preferable that the diameter of the curved surface 511, which is arc-shaped when viewed from the axial direction A, is 70 mm or less.

[0020] The central stator 51 further has a pair of protrusions 515 and a pair of rail portions 516. The pair of protrusions 515 are located on both sides of the central stator 51 in a second direction D2 that is perpendicular to both the axial direction A and the first direction D1. The pair of protrusions 515 each protrude slightly along the second direction D2. The pair of rail portions 516 are located on both sides of the central stator 51 in the second direction D2. The rail portions 516 have a recessed outer shape. The rail portions 516 extend along the axial direction A. When viewed from each of the pair of rail portions 516, the pair of protrusions 515 are located on the opposite side of the extending stator 52.

[0021] The pair of extending stators 52 extend in the first direction D1 from the central stator 51. The pair of extending stators 52 are positioned side by side and spaced apart in the second direction D2.

[0022] When viewed from the axial direction A, each of the connection portions 53 between the central stator 51 and the pair of extending stators 52 is narrowed. This allows the stator 50 to be easily elastically deformed at the connection portions 53. From the viewpoint of facilitating the elastic deformation, the narrowest part of the connection portion 53 has a thickness dimension in the radial direction about the rotation center point O when viewed from the axial direction A of preferably 10 mm or less, and more preferably 6 mm or less.

[0023] The pair of extending stators 52 have continuous inner surfaces 521 at both ends of the curved surface 511 as viewed from the axial direction A. The inner surfaces 521 extend in a substantially straight line as viewed from the axial direction A. The inner surfaces 521 are positioned such that the distance between the inner surfaces 521 increases with increasing distance from the curved surface 511. Each of the pair of extending stators 52 has a tip end 522 on the side opposite the central stator 51. As viewed from the axial direction A, of the angles formed by the line segment connecting one tip end 522 to the rotation center O and the line segment connecting the other tip end 522 to the rotation center O, the angle γ on the curved surface 511 side is preferably 180 degrees or greater. This makes it easier to place the tube 2 in the guide path G.

[0024] Each of the pair of extending stators 52 has a ridge portion 525. The ridge portion 525 is located on the opposite side from the inner surface 521. The ridge portion 525 extends parallel to the first direction D1. The ridge portion 525 does not extend to the tip portion 522. That is, the ridge portion 525 is located apart from the tip portion 522. The height dimension of the ridge portion 525 in the second direction D2 is preferably, for example, not less than 0.1 mm and not more than 1.0 mm.

[0025] Next, the pair of wall portions 12 of the main body portion 10 will be described in detail. The pair of wall portions 12 are in sliding contact with the pair of extending stators 52 on the side opposite to the inner surfaces 521 of the pair of extending stators 52. From the viewpoint of miniaturizing the roller pump 1, it is preferable that the distance between the portions of the pair of wall portions 12 that are in sliding contact with the extending stators 52 in the second direction D2 is 80 mm or less.

[0026] Each of the pair of wall portions 12 has a sliding surface portion 121 and an extension surface portion 122. The sliding surface portion 121 extends parallel to the first direction D1. As shown in FIGS. 2 and 5 , the sliding surface portion 121 is in sliding contact with the corresponding one of the pair of extending stators 52. The extension surface portion 122 extends from the sliding surface portion 121 in the first direction D1. The extension surface portion 122 bends to approach the other one of the pair of wall portions 12 and is located continuously from the sliding surface portion 121. The extension surface portion 122 has a curved outer shape when viewed from the axial direction A, but may also have a linear outer shape.

[0027] As shown in FIG. 2, when the stator 50 is in the first state, the pair of extending stators 52 are wedged between the extension surface portions 122 of the pair of wall portions 12, thereby elastically deforming and engaging with the pair of wall portions 12. As a result, while the stator 50 is displaceable, when in the first state, the stator 50 engages with the wall portions 12 while elastically deforming as described above. This allows the wall portions 12 to suppress vibration of the stator 50, thereby reducing noise caused by vibration of the stator 50. On the other hand, as shown in FIG. 5, when the stator 50 is in the second state, it is not elastically deformed. Therefore, when the first state is released, the stator 50 can slide smoothly.

[0028] Each of the pair of wall portions 12 has a recessed streak portion 125 that engages with a corresponding protruding streak portion 525. In this embodiment, at least a portion of the bottom portion 125B of the recessed streak portion 125 is the extended surface portion 122. In this manner, the engagement between the protruding streak portion 525 and the recessed streak portion 125 allows the stator 50 to slide smoothly in the first direction D1. Furthermore, since at least a portion of the bottom portion 125B is the extended surface portion 122, the protruding streak portion 525 of the pair of extending stators 52 can smoothly fit between each of the extended surface portions 122. Note that in this embodiment, another portion of the bottom portion 125B of the recessed streak portion 125 is the sliding surface portion 121.

[0029] As described above, the connection portion 53 between the central stator 51 and the pair of extending stators 52 is constricted when viewed from the axial direction A. This allows the stator 50 to more easily elastically deform at the connection portion 53. As a result, the pair of extending stators 52 can smoothly fit between the extension surface portions 122.

[0030] In this embodiment, the structure of the extended stators 52 may be different from that described above, as long as the pair of extended stators 52 are wedged between the extension surface portions 122 of the pair of wall portions 12 when the stator 50 is in the first state. FIG. 6 is a cross-sectional view showing the first state of a roller pump according to a modified embodiment of the present disclosure. As shown in FIG. 6, in a roller pump 1a according to a modified embodiment of the present disclosure, when the stator 50a is in the first state, the tip end portion 522a of the extended stator 52a is wedged between the extension surface portions 122 of the pair of wall portions 12, causing the stator 50a to elastically deform and engage with the wall portions 12. Therefore, in this modified embodiment, vibration of the stator 50a is also suppressed by the wall portions 12.

[0031] Next, the lid portion 60 of the roller pump 1 according to one embodiment of the present disclosure will be described. As shown in Figures 1 to 3, the lid portion 60 can be positioned to cover the roller support member 30, the plurality of rollers 40, and the stator 50 at least in the axial direction A.

[0032] The lid portion 60 has a lid plate 61 and a pair of arm portions 62. In the closed state, the lid plate 61 covers the roller support member 30, the plurality of rollers 40, and the stator 50 in at least one direction. As shown in Figures 1 to 3, when the stator 50 is in a first state, the lid plate 61 is in a closed state.

[0033] The pair of arms 62 extend from the cover plate 61 and engage with the main body 10. The pair of arms 62 are configured to be able to open and close the cover plate 61 by rotating relative to the main body 10 in a planar direction along the axial direction A and the first direction D1. Here, the pair of support parts 15 of the main body 10 rotatably support the pair of arms 62. Specifically, the arm part 62 has an opening / closing shaft 621 extending in the second direction D2, and the opening / closing shaft 621 is rotatably supported by the support part 15.

[0034] The pair of arm portions 62 are located on either side of the central stator 51 in the second direction D2. When the stator 50 is in the first state, the pair of arm portions 62 are each located adjacent to the connection portion 53 between the central stator 51 and the extending stator 52 when viewed from the axial direction A. As described above, the connection portion 53 has a narrowed shape when viewed from the axial direction A, and therefore, by positioning the pair of arm portions 62 in this manner, the roller pump 1 can be made even more compact.

[0035] The pair of support portions 15 extend from the plate-shaped portion 11 in the axial direction A so as to be positioned between the central stator 51 and the pair of arm portions 62 in the first state. As shown in FIGS. 2 and 5 , the pair of support portions 15 are positioned so as to be able to slide against the central stator 51 when the stator 50 changes between the first state and the second state. This reduces the dimension between the stator 50 (the central stator 51) and the pair of support portions 15 in the first state. This reduction in dimension reduces the impact sound between the vibrating stator 50 and the pair of support portions 15, thereby further suppressing noise generation. More specifically, when the stator 50 changes between the first state and the second state, the pair of support portions 15 are positioned so as to be able to slide against the protruding portions 515 of the central stator 51. This facilitates designing the central stator 51 to reduce the dimension between the central stator 51 and each of the pair of support portions 15 by adjusting the height of the protruding portions 515. Furthermore, in the first state, the distance between the central stator 51 and each of the pair of supports 15 is preferably 0.5 mm or less, and more preferably 0.3 mm or less. That is, the distance between the pair of supports 15 and the corresponding protrusions 515 is preferably 0.5 mm or less, and more preferably 0.3 mm or less. If the distance between the central stator 51 and each of the pair of supports 15 is 0.5 mm or less, the impact sound between the vibrating stator 50 and the pair of supports 15 is further reduced, and noise generation can be further suppressed.

[0036] In this embodiment, when the cover 60 is in the open state, the stator 50 is in the second state. That is, in the roller pump 1 according to this embodiment, the stator 50 can be changed from the first state to the second state by changing the cover 60 from the closed state to the open state. This makes it easier to attach the tube 2. The above configuration is realized by a link mechanism described below, but may also be realized by another link mechanism or an electrical drive mechanism such as an actuator.

[0037] As shown in FIGS. 1 and 2, each of the pair of arm portions 62 further has a slide pin 622. The slide pin 622 protrudes in the second direction D2. Specifically, the slide pin 622 protrudes toward the stator 50 (specifically, the central stator 51). The slide pins 622 are slidably engaged with the pair of rail portions 516, respectively. Therefore, the relative positions of the slide pin 622 and the stator 50 (the central stator 51) in the first direction D1 are restricted. On the other hand, the relative positions of the slide pin 622 and the stator 50 (the central stator 51) in the axial direction A are not restricted.

[0038] As shown in FIGS. 1 and 4 , when the cover 60 is changed from the open state to the closed state, the arm 62 rotates around the opening / closing shaft 621. Accordingly, the slide pin 622 also displaces in the circumferential direction around the opening / closing shaft 621. Then, as the slide pin 622 is displaced, the slide pin 622 slides on the rail 516 and displaces the rail 516 only in the first direction D1. As the rail 516 is displaced in the first direction D1, the stator 50 is displaced in the first direction D1. In this way, as the cover 60 is changed from the closed state to the open state, the stator 50 changes from the first state to the second state.

[0039] [Note] As described above, the embodiments of the present disclosure include the following.

[0040] (Configuration 1) A roller pump (1) that can transport a liquid in a flexible tube (2) by attaching the tube (2), A main body (10), a shaft portion (20) that is rotatable while being supported by the main body portion (10); a roller support member (30) attached to the shaft portion (20); a plurality of rollers (40) attached to the roller support member (30) and arranged side by side in the circumferential direction of the shaft portion (20) as viewed from the axial direction (A) of the shaft portion (20); a stator (50) that has a substantially U-shaped outer shape when viewed from the axial direction (A) and that can be positioned to form a guide path (G) for the tube (2) together with the plurality of rollers (40) that are displaced as the shaft portion (20) rotates; the stator (50) is configured to be capable of assuming a first state in which the guide path (G) is formed, and a second state in which the stator (50) is displaced along a first direction (D1) perpendicular to the axial direction (A) to increase the separation distance from the shaft portion (20) compared to the first state, The stator (50) a central stator (51) having an arc-shaped curved surface (511) when viewed from the axial direction (A) to form the guide path (G); a pair of extending stators (52) extending from the central stator (51) along the first direction (D1) and having continuous inner surfaces (521) at both ends of the curved surface (511) when viewed from the axial direction (A); The main body portion (10) is a plate-like portion (11) extending in a direction perpendicular to the axial direction (A) while supporting the shaft portion (20); a pair of wall portions (12) extending from the plate-like portion (11) along the axial direction (A) and in sliding contact with the pair of extending stators (52) on the side opposite to the inner surfaces (521) of the pair of extending stators (52), Each of the pair of wall portions (12) a sliding surface portion (121) that is parallel to the first direction (D1) and that is in sliding contact with a corresponding one of the pair of extending stators (52); an extension surface portion (122) extending from the sliding contact surface portion (121) in the first direction (D1), bending to approach the other wall portion (12) of the pair of wall portions (12), and positioned continuously from the sliding contact surface portion (121); When the stator (50) is in the first state, the pair of extended stators (52) are wedged between the extension surface portions (122) of the pair of wall portions (12), thereby elastically deforming and engaging with the pair of wall portions (12).

[0041] (Configuration 2) Each of the pair of extending stators (52) has a protruding ridge (525) located on the opposite side to the inner surface (521) and extending parallel to the first direction (D1), Each of the pair of wall portions (12) has a groove portion (125) that engages with the corresponding protrusion portion (525), The roller pump (1) according to configuration 1, wherein at least a part of the bottom (125B) of the groove portion (125) is the extension surface portion (122).

[0042] (Configuration 3) The roller pump (1) according to configuration 1 or 2, wherein a connecting portion (53) between the central stator (51) and the pair of extending stators (52) is constricted when viewed from the axial direction (A).

[0043] (Configuration 4) The roller support member (30), the plurality of rollers (40), and the stator (50) may further include a cover (60) that can be positioned to cover the roller support member (30), the plurality of rollers (40), and the stator (50), The lid portion (60) is a cover plate (61) that covers the roller support member (30), the plurality of rollers (40), and the stator (50) in a closed state; a pair of arms (62) extending from the cover plate (61) and engaging with the main body (10), configured to be able to open and close the cover plate (61) by rotating relative to the main body (10) along a plane direction along the axial direction (A) and the first direction (D1); the pair of arm portions (62) are located on both sides of the central stator (51) in a second direction (D2) perpendicular to both the first direction (D1) and the axial direction (A); the main body (10) further includes a pair of support portions (15) extending from the plate-like portion (11) in the axial direction (A) so as to be positioned between the central stator (51) and the pair of arm portions (62) in the first state, and rotatably supporting the pair of arm portions (62); The roller pump (1) according to any one of configurations 1 to 3, wherein the pair of support portions (15) are positioned so as to be able to slide against the central stator (51) when the stator (50) changes between the first state and the second state.

[0044] (Configuration 5) 5. The roller pump (1) according to configuration 4, wherein in the first state, the dimension between the central stator (51) and each of the pair of support portions (15) is 0.5 mm or less.

[0045] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is defined by the claims, not by the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0046] 1,1a roller pump, 2 tube, 10 main body portion, 11 plate-shaped portion, 12 wall portion, 121 sliding surface portion, 122 extension surface portion, 125 groove portion, 125B bottom portion, 15 support portion, 20 shaft portion, 30 roller support member, 40 roller, 50,50a stator, 51 central stator, 511 curved surface, 515 convex portion, 516 rail portion, 52,52a extended stator, 521 inner surface, 522,522a tip portion, 525 convex portion, 53 connection portion, 60 lid portion, 61 lid plate, 62 arm portion, 621 opening / closing shaft, 622 slide pin.

Claims

1. A roller pump capable of transporting a liquid in a flexible tube by attaching the roller pump to the flexible tube, a main body; a shaft portion that is rotatable while being supported by the main body portion; a roller support member attached to the shaft portion; a plurality of rollers attached to the roller support member and arranged side by side in the circumferential direction of the shaft portion when viewed in the axial direction of the shaft portion; a stator that has a substantially U-shaped outer shape when viewed from the axial direction and is positionable to form a guide path for the tube together with the plurality of rollers that are displaced as the shaft portion rotates; the stator is configured to be able to assume a first state in which the guide path is formed, and a second state in which the stator is displaced along a first direction perpendicular to the axial direction, thereby increasing a separation distance from the shaft portion compared to the first state, The stator includes: a central stator having an arc-shaped curved surface when viewed in the axial direction, thereby forming the guideway; a pair of extending stators extending from the central stator along the first direction and having continuous inner surfaces at both ends of the curved surface when viewed from the axial direction; The main body portion is a plate-like portion that supports the shaft portion and extends in a direction perpendicular to the axial direction; a pair of wall portions extending from the plate-like portion along the axial direction and in sliding contact with the pair of extending stators on the side opposite to the inner surfaces of the pair of extending stators, Each of the pair of wall portions is a sliding surface portion that is parallel to the first direction and that is in sliding contact with a corresponding one of the pair of extending stators; an extension surface portion extending from the sliding contact surface portion in the first direction, bending to approach the other wall portion of the pair of wall portions, and positioned continuously from the sliding contact surface portion; A roller pump in which, when the stator is in the first state, the pair of extended stators are wedged between the extended surface portions of each of the pair of wall portions, thereby elastically deforming and engaging with the pair of wall portions.

2. Each of the pair of extending stators has a protruding portion located on the opposite side to the inner surface and extending parallel to the first direction, Each of the pair of wall portions has a recess portion that engages with the corresponding protrusion portion, 2. The roller pump according to claim 1, wherein at least a portion of the bottom of said groove portion is said extended surface portion.

3. 2. The roller pump according to claim 1, wherein a connection portion between said central stator and said pair of extending stators is constricted when viewed in the axial direction.

4. a cover portion that can be positioned to cover the roller support member, the plurality of rollers, and the stator; The lid portion is a cover plate that covers the roller support member, the plurality of rollers, and the stator in a closed state; a pair of arms extending from the cover plate and engaging with the main body portion, and configured to be able to open and close the cover plate by rotating relative to the main body portion along a planar direction that is aligned with the axial direction and the first direction, the pair of arm portions are located on both sides of the central stator in a second direction perpendicular to both the first direction and the axial direction, the main body portion further includes a pair of support portions extending in the axial direction from the plate-like portion so as to be positioned between the central stator and the pair of arm portions in the first state and rotatably supporting the pair of arm portions, 4. The roller pump according to claim 1, wherein the pair of support portions are positioned so as to be able to slide against the central stator when the stator changes between the first state and the second state.

5. 5. The roller pump according to claim 4, wherein in the first state, the dimension between the central stator and each of the pair of supports is 0.5 mm or less.

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