JP2018204462A - Tube pump and blood purifier - Google Patents

Abstract

To realize a tube pump capable of pressing various kinds of tubes with a different diameter by appropriate force.SOLUTION: A rotor 11 of a tube pump 1 comprises a roller 40, a rotary base part 41, a spring shaft 42, and an orthogonal shaft 43. On the spring shaft 42, a long hole 70 is provided, which can move the orthogonal shaft 43. Between the rotary base part 41 and the orthogonal shaft 43 on the spring shaft 42, an elastic member 46 and a spring 45 are interposed. The elastic member 46 compressively deforms when the orthogonal shaft 43 moves toward an inward direction in the long hole 70. The spring 45 is compressed when the orthogonal shaft 43 moves to an inside end of the long hole 70 and further the spring shaft 42 slides in the inward direction, thereby pressing the orthogonal shaft 43 toward an outward direction.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a tube pump and a blood purification apparatus.

  For example, a tube pump for feeding blood of a patient in a blood circuit of a blood purification apparatus usually uses a tube pump that handles a tube through which blood passes and pumps blood in the tube.

  The above-described tube pump has a rotating body and a circular housing portion that houses the rotating body. The rotating body has a roller that contacts the tube, and the accommodating portion has a circumferential fixed wall that surrounds the outer periphery of the rotating body. And a tube is arrange | positioned in circular arc shape along a fixed wall, and a tube is pinched | interposed between the roller of a rotary body, and a fixed wall. In this state, the rotating body is rotated, the tube is handled by the roller of the rotating body, and blood in the tube is pumped (see Patent Document 1).

JP 2015-2222042 A

  By the way, in the blood circuit as described above, tubes having different diameters may be used. For example, in a blood circuit for dialysis treatment, a thin tube and a thick tube are selected. When changing to a tube having a different diameter, it is necessary for the user to appropriately adjust the gap between the rotating body and the fixed wall and the load applied to the tube, resulting in work.

  It is also conceivable to attach a spring to the roller of the rotating body and adjust the position of the roller according to the diameter of the tube. However, in this case, since the load that the tube receives from the spring differs depending on the diameter of the tube, the tube may not be pressed with an appropriate force depending on the diameter of the tube.

  The present application has been made in view of such a point, and an object thereof is to realize a tube pump capable of pressing a plurality of types of tubes having different diameters with an appropriate force.

  As a result of intensive studies, the present inventors have provided a long hole in the sliding shaft of the rotating body in which the interlocking member can move inward and outward, and the interlocking member is located between the rotation base on the sliding shaft and the interlocking member. Has found that the above problems can be solved by providing an elastic member that compressively deforms when moving inward in the elongated hole, and has completed the present invention.

That is, the present invention includes the following aspects.
(1) A rotating body and a fixed wall provided on the outer periphery of the rotating body, and a tube disposed between the rotating body and the fixed wall is handled by the rotating body to allow fluid in the tube to flow. A tube pump for pumping, wherein the rotating body is capable of contacting the tube from the inside, and is capable of moving forward and backward with respect to the fixed wall, a rotating base having a rotating shaft, and inward and outward with respect to the rotating base. A sliding shaft that is slidable and an interlocking member that is fixed to the roller and interlocks the roller and the sliding shaft, and the interlocking member is inserted into the sliding shaft, and the interlocking An elongated hole is provided to allow the member to move inward and outward, and an elastic member and a spring having a higher elastic modulus than the elastic member are interposed between the rotating base on the sliding shaft and the interlocking member. And the elastic member has the interlocking member in the elongated hole. The spring is compressed and deformed when moving inward, and the spring is compressed when the interlocking member moves to the inner end of the elongated hole and the sliding shaft slides inwardly, thereby moving the interlocking member outward. A tube pump that pushes in the direction.
(2) The tube pump according to (1), wherein the interlocking member is positioned at an outer end of the elongated hole in a state where the spring is natural length and the elastic member is not compressed and deformed.
(3) The tube pump according to (1) or (2), wherein the elastic member is formed in an annular shape, and the sliding shaft is inserted inside the elastic member.
(4) The tube pump according to any one of (1) to (3), wherein the interlocking member is an orthogonal axis orthogonal to the sliding axis.
(5) The tube according to any one of (1) to (4), further including a bracket that rotatably holds the roller, wherein the interlocking member is fixed to the roller via the bracket. pump.
(6) A blood purification apparatus comprising the tube pump according to any one of (1) to (5).

  ADVANTAGE OF THE INVENTION According to this invention, the tube pump which can hold down multiple types of tubes from which a diameter differs with appropriate force is realizable.

It is a top view which shows an example of a structure of a tube pump. It is a perspective view which shows an example of a structure of a tube pump. It is explanatory drawing which shows the internal structure of a rotary body. It is a side view of a rotary body. It is explanatory drawing which shows the cross section of a rotary body. It is explanatory drawing which shows the structure of a roller periphery when a thin tube is arrange | positioned. It is explanatory drawing which shows the structure of a roller periphery when a thick tube is arrange | positioned. It is a graph which shows the relationship between the load of the spring concerning a tube, and the clearance gap between a roller and a fixed wall.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same element and the overlapping description is abbreviate | omitted. Further, the positional relationship such as up, down, left and right is based on the positional relationship shown in the drawings unless otherwise specified. Furthermore, the dimensional ratios in the drawings are not limited to the illustrated ratios. Moreover, the following embodiment is an illustration for explaining the present invention, and the present invention is not limited to this embodiment.

  FIG.1 and FIG.2 is a figure which shows the outline of a structure of the tube pump 1 in this Embodiment. The tube pump 1 has a main body 10 and a rotating body 11. The main body 10 has a housing portion 20 that houses the rotating body 11. The accommodating part 20 has a circularly recessed shape, and has an arcuate fixed wall 30 as an outer peripheral wall, and a tube entrance / exit 31 where the tube A enters and exits.

  For example, as shown in FIGS. 3 and 4, the rotating body 11 includes a plurality of, for example, two rollers 40, a rotating base 41, a spring shaft 42 as a sliding shaft, an orthogonal shaft 43 as an interlocking member, and a bracket 44. A spring 45, an elastic member 46, a guide 47, and the like.

  The rotation base 41 has, for example, a substantially rectangular parallelepiped shape and is located at the center of the rotation body 11. The rotation base 41 includes a rotation shaft 50 at the center. The rotation base 41 is rotated around the rotation shaft 50 by a drive motor built in the main body 10. In the present embodiment, the direction in which the rotating shaft 50 stands is the vertical direction, the direction perpendicular to the rotating shaft 50 is the horizontal direction, and the direction toward the outside of the housing portion 20 in the horizontal direction (the rotating shaft 50 is a circle). The radial direction is not limited to the centered radial direction), and the inward direction is the inward direction.

  As shown in FIG. 5, the rotary base 41 is provided with a spring shaft 42 slidable in the inner and outer directions (left and right direction in FIG. 5). The spring shaft 42 is inserted into a guide hole 60 formed in the rotation base 41 and slides along the guide hole 60. A stopper 61 having a diameter larger than that of the guide hole 60 is provided at the end of the spring shaft 42 on the rotation base 41 side (inner side), and the spring shaft 42 moves in the outer direction (left direction in FIG. 5). It defines a limit.

  As shown in FIGS. 5 and 6, an elongated hole 70 is formed in the axial direction (inside and outside direction) of the spring shaft 42 in the vicinity of the outer end portion of the spring shaft 42. An orthogonal shaft 43 is inserted into the long hole 70. The orthogonal shaft 43 is formed in a cylindrical shape extending in the vertical direction, and is fixed to the bracket 44 at the upper end portion and the lower end portion.

  As shown in FIG. 3, the bracket 44 has a fulcrum shaft 80 that is fixed to the rotation base 41 and extends in the vertical direction, and can rotate around the fulcrum shaft 80.

  The bracket 44 holds the roller 40 rotatably. For example, the bracket 44 has a rotating shaft 81 extending in the up-down direction, and the roller 40 is rotatably attached to the rotating shaft 81. The roller 40 is formed in a columnar shape, for example.

  The roller 40 is movable back and forth with respect to the fixed wall 30. When the roller 40 moves, the bracket 44 rotates about the fulcrum shaft 80, the orthogonal shaft 43 rotates, and the orthogonal shaft 43 moves the spring shaft 42. Slide.

  As shown in FIGS. 5 and 6, the spring (compression spring) 45 and the elastic member 46 are provided on the spring shaft 42 in this order from the rotation base 41 toward the orthogonal shaft 43 (outward direction). The spring 45 is a coil spring, and an end in the inner direction is in contact with the rotation base 41. The outer end of the spring 45 is in contact with the elastic member 46. The spring 45 has high rigidity and a higher elastic modulus than the elastic member 46.

  As shown in FIG. 6, the elastic member 46 is formed in an annular shape, and is interposed between the spring 45 of the spring shaft 42 and the orthogonal shaft 43. The elastic member 46 is formed of, for example, resin and has an elastic modulus lower than that of the spring 45. The outer end of the elastic member 46 is in contact with the orthogonal shaft 43. As shown in FIG. 3, the guide 47 protrudes outward from the orthogonal shaft 43, for example, and can guide the tube A by pressing it from the inside.

  As shown in FIG. 6, the gap D (distance) between the roller 40 on which the tube A is disposed and the fixed wall 30 is determined by the position of the roller 40. For example, when the use of two types of tubes is planned, the initial position before the movement of the roller 40 can hold the tube A1 with an appropriate load when a predetermined thin tube A1 is disposed in the gap D. Set to position. The initial position before the movement of the roller 40 at this time is the natural length without the spring 45 being compressed, the elastic member 46 is not compressed and deformed, and the outer end of the elastic member 46 is in contact with the orthogonal shaft 43 and is orthogonal. The shaft 43 is located at the outer end of the long hole 70 of the spring shaft 42. The position of the roller 40 at this time is held by the rigidity of the elastic member 46 and the spring 45, for example. When the tube pump 1 operates, the rotating body 11 rotates around the rotation shaft 50, the roller 40 rotates, the roller 40 handles the tube A1, and the liquid in the tube A1 is pumped.

  As shown in FIG. 7, when a predetermined thick tube A2 is disposed in the gap D, the roller 40 moves inward from the initial position, so that the orthogonal shaft 43 plays play in the long hole 70 of the spring shaft 42. Move inward. At this time, the elastic member 46 is compressed and deformed while the spring 45 maintains the natural length. When the orthogonal shaft 43 moves to the inner end of the elongated hole 70, the elastic member 46 is sufficiently compressed and cannot be displaced, and when the orthogonal shaft 43 is pushed further inward by the roller 40, the spring shaft 42 is pushed to the inner side. The spring 45 is pushed by the orthogonal shaft 43 and compressed. As a result, a reaction force is generated in the spring 45, and the spring 45 pushes the orthogonal shaft 43 back outward. The roller 40 moves to a position where the reaction force of the spring 45 is balanced with the reaction force applied to the roller 40 by the tube A2.

  According to the present embodiment, when the thick tube A2 is used as shown in FIG. 8, the elastic member 46 is compressed and the spring 45 is not compressed while the orthogonal shaft 43 moves in the play of the long hole 70. The load of the spring 45 applied to the tube A2 does not increase. As a result, the load applied to the thick tube A2 can be finally reduced by the spring 45, and can be suppressed to an appropriate load range. Therefore, a plurality of types of tubes having different diameters can be pressed with an appropriate force.

  In the state where the spring 45 is natural length and the elastic member 46 is not elastically deformed, the orthogonal shaft 43 is located at the outer end of the long hole 70, so that the increase in the diameter of the tube is sufficiently absorbed by the elastic member 46. The variation in load applied to tubes having different diameters can be suitably reduced.

  Since the elastic member 46 is formed in an annular shape and the spring shaft 42 is inserted inside the elastic member 46, the peripheral structure including the orthogonal shaft 43, the spring shaft 42, and the elastic member 46 can be simplified.

  Since the orthogonal shaft 43 is orthogonal to the spring shaft 42, the spring shaft 42 and the roller 40 can be linked appropriately.

  Since the orthogonal shaft 43 is fixed to the roller 40 via the bracket 44, the roller 40, the orthogonal shaft 43, and the spring shaft 42 can be suitably interlocked. As described above, the orthogonal shaft 43 may be indirectly fixed to the roller 40 via another member, or may be directly fixed without using another member.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the idea described in the claims, and these naturally belong to the technical scope of the present invention. It is understood.

  The tube pump 1 in the present embodiment can be used as a blood pump that pumps blood in the blood circuit of the blood purification apparatus. Moreover, you may use the tube pump 1 for the other pump used with a blood purification apparatus. The tube pump 1 can be used as a pump for a blood purification apparatus that performs dialysis therapy, plasma exchange therapy, leukocyte removal therapy, continuous slow blood filtration therapy, and the like. Moreover, you may use the tube pump 1 for the pump of apparatuses other than the blood purification apparatus.

  The configuration of the tube pump 1 is not limited to that of the above embodiment, and the present invention can be applied to those having other configurations. For example, the number of rollers, the shape of each member such as the roller 40, the rotation base 41, the bracket 44, the orthogonal shaft 43, the spring shaft 42, the spring 45, and the elastic member 46 are not limited to those in the above embodiment. In particular, the material and shape of the elastic member 46 may be other.

  The present invention is useful when realizing a tube pump capable of holding a plurality of types of tubes having different diameters with an appropriate force.

DESCRIPTION OF SYMBOLS 1 Tube pump 10 Main body 11 Rotating body 30 Fixed wall 40 Roller 41 Rotation base 42 Spring shaft 43 Orthogonal shaft 44 Bracket 45 Spring 46 Elastic member 70 Slot A, A1, A2 Tube

Claims (6)

A tube comprising a rotator and a fixed wall provided on an outer periphery of the rotator, and a tube disposed between the rotator and the fixed wall is handled by the rotator to pump a fluid in the tube. A pump,
The rotating body is
A roller that can be in contact with the tube from the inside and that is movable back and forth with respect to the fixed wall;
A rotation base having a rotation axis;
A sliding shaft slidable inward and outward with respect to the rotating base;
An interlocking member fixed to the roller and interlocking the roller and the sliding shaft;
The sliding shaft is provided with a long hole through which the interlocking member is inserted and the interlocking member is movable inward and outward directions,
Between the rotation base on the sliding shaft and the interlocking member, an elastic member and a spring having a higher elastic modulus than the elastic member are interposed,
The elastic member is compressively deformed when the interlocking member moves inward in the elongated hole,
The tube pump is a tube pump that is compressed when the interlocking member moves to the inner end of the elongated hole and the sliding shaft slides inwardly to push the interlocking member outward.   2. The tube pump according to claim 1, wherein the interlocking member is positioned at an outer end of the elongated hole in a state where the spring is a natural length and the elastic member is not compressed and deformed.   The tube pump according to claim 1 or 2, wherein the elastic member is formed in an annular shape, and the sliding shaft is inserted through the elastic member.   The tube pump according to any one of claims 1 to 3, wherein the interlocking member is an orthogonal axis orthogonal to the sliding axis. A bracket for rotatably holding the roller;
The tube pump according to claim 1, wherein the interlocking member is fixed to the roller via the bracket.   The blood purification apparatus provided with the tube pump in any one of Claims 1-5.

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