Pump for medical purposes

Abstract

To provide a pump for medical purposes which can inhibit wear of a tube.SOLUTION: A pump 1 for medical purposes includes: a rotor 11 having a plurality of rollers 50 and configured to be rotatable; a stator 12 configured to form a tube striking part 30 with the rotor 11; and a tube fixing part 110 having an inlet holding part 110 which sandwiches and holds a tube at the inlet side of the tube striking part 30 and an outlet holding part 111 which sandwiches and holds the tube at the outlet side of the tube striking part 30. The tube fixing part 100 is configured so that a gap D1 of the inlet holding part 100 formed when the tube is held at the inlet side of the tube striking part 30 is smaller than a gap D2 of the outlet holding part 111 formed when the tube is held at the outlet side of the tube striking part 30.SELECTED DRAWING: Figure 14

Description

Technical Field

[0001] The present invention relates to a medical pump.

Background Art

[0002] Conventionally, a pump that handles a tube through which a liquid flows and pumps the liquid in the tube has been known (see Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in the pump as described above, the tube is fixed with a strong force on both the inlet side and the outlet side. For this reason, when the tube is handled and pulled by the operation of the pump, friction may occur between the fixing portion of the pump that fixes the tube and the tube, and the tube may wear.

[0005] The present invention has been made in view of such a point, and one of its objects is to provide a medical pump capable of suppressing wear of the tube.

Means for Solving the Problems

[0006] As a result of intensive studies, the inventors of the present invention have found that the above problems can be solved by configuring the tube fixing portion such that the gap of the inlet holding portion when holding the tube on the inlet side of the tube handling portion is smaller than the gap of the outlet holding portion when holding the tube on the outlet side of the tube handling portion, and have completed the present invention.

[0007] That is, the present invention includes the following aspects. (1) A medical pump, comprising: a rotor having a plurality of rollers and configured to be rotatable; a stator configured to form a tube handling portion between the rotor; an inlet holding portion configured to hold a tube while sandwiching the tube on the inlet side of the tube handling portion; and an outlet holding portion configured to hold the tube while sandwiching the tube on the outlet side of the tube handling portion. The tube fixing portion is configured such that a gap of the inlet holding portion when holding the tube on the inlet side of the tube handling portion is smaller than a gap of the outlet holding portion when holding the tube on the outlet side of the tube handling portion. (2) The medical pump according to (1), wherein the tube fixing portion is configured such that a force with which the inlet holding portion holds the tube is greater than a pulling force of the tube due to the operation of the pump, and a force with which the outlet holding portion holds the tube is smaller than a pushing force of the tube due to the operation of the pump. (3) The medical pump according to (1) or (2), wherein the inlet holding portion has a first surface and a second surface that face each other and sandwich the tube therebetween, and the outlet holding portion has a third surface and a fourth surface that face each other and sandwich the tube therebetween. (4) The medical pump according to (3), further comprising a base configured to hold the stator, wherein the stator is configured to move relative to the base and advance and retreat with respect to a part of the base, the stator includes the first surface of the inlet holding portion and the third surface of the outlet holding portion, and the base includes the second surface of the inlet holding portion and the fourth surface of the outlet holding portion. (5) The medical pump according to (4), further comprising an opening / closing mechanism configured to advance and retreat the stator with respect to the rotor to open and close the tube handling portion, wherein the opening / closing mechanism advances and retreats the stator with respect to a part of the base. (6) The medical pump according to (3) to (5), wherein the first surface, the second surface, the third surface, and the fourth surface have a V shape or a U shape. (7) The first surface and the third surface have a U shape, and the second surface and the fourth surface have a V shape. The medical pump according to (6). (8) The tube fixing part further includes a tube insertion port and a guide part that guides the tube from the tube insertion port to the inlet holding part. The medical pump according to any one of (1) to (7). (9) The tube fixing part further includes a tube insertion port and a guide part that guides the tube from the tube insertion port to the outlet holding part. The medical pump according to any one of (1) to (8). (10) The tube fixing part further includes a tube insertion port and a suppression part that suppresses the tube from being displaced and held on the opposite side of the tube insertion port from the inlet holding part. The medical pump according to any one of (1) to (9). (11) The tube fixing part further includes a tube insertion port and a suppression part that suppresses the tube from being displaced and held on the opposite side of the tube insertion port from the outlet holding part. The medical pump according to any one of (1) to (10). (12) The medical pump according to any one of (1) to (11) further includes an adjustment part that adjusts the size of the gap of the inlet holding part. (13) A medical pump, comprising: a rotor having a plurality of rollers and configured to be rotatable; a stator configured to form a tube handling part between the rotor; an inlet holding part that sandwiches and holds the tube on the inlet side of the tube handling part; an outlet holding part that sandwiches and holds the tube on the outlet side of the tube handling part; and a tube fixing part having the above, wherein the tube fixing part is configured such that the force with which the outlet holding part holds the tube is smaller than the force with which the inlet holding part holds the tube.

Advantages of the Invention

[0008] According to the present invention, a medical pump capable of suppressing wear of a tube can be provided.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

MODE FOR CARRYING OUT THE INVENTION

[0010] Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

[0011] FIG. 1 is a front view for explaining an example of the structure of the medical pump 1. FIG. 2 is a perspective view seen from the left side for explaining an example of the structure of the medical pump 1, and FIG. 3 is a perspective view seen from the right side for explaining an example of the structure of the medical pump 1. FIG. 4 is a perspective view seen from the back side for explaining an example of the structure of the medical pump 1. In this specification, based on the attitude of the medical pump 1 shown in FIG. 1, the front - rear direction X, the left - right direction Y, and the up - down direction Z are defined.

[0012] In one embodiment, the medical pump 1 is installed in a medical device that uses a liquid. The medical device may be an infertility treatment device or a dialysis device.

[0013] As shown in FIGS. 1 to 3, the medical pump 1 includes a base 10, a rotor 11, a stator 12, and an opening / closing mechanism 13.

[0014] As shown in FIGS. 2 and 3, the base 10 has a back surface portion 20 and a bottom portion 21. The back surface portion 20 has a flat plate shape with the plate surface directed in the front - rear direction X. The bottom portion 21 is provided at the lower part on the front side of the back surface portion 20. The bottom portion 21 protrudes forward with respect to the back surface portion 20. The bottom portion 21 may have a front portion 22 that protrudes upward on the front side and covers the front surface of the rotor 11.

[0015] As shown in FIGS. 1 to 3, the stator 12 is disposed on the front side of the back surface portion 20 of the base 10 and above the bottom portion 21. The stator 12 has a lower surface wall 40 that forms a tube handling portion 30 between the stator 12 and the rotor 11. The lower surface wall 40 has an upwardly convex arc shape with an inner angle of about 360 degrees / the number of rollers.

[0016] As shown in FIG. 1, the rotor 11 has a circular shape when viewed from the front. The rotor 11 has a plurality of, for example, three rollers 50. The three rollers 50 are provided at equal intervals on the same circumference of the rotor 11. The rotor 11 has a rotating shaft 51 that penetrates the back surface portion 20 in the front-rear direction X and is connected to a motor (not shown). The rotor 11 can rotate around the rotating shaft 51 by driving of the motor. The roller 50 can rotate on the same circumference around the rotating shaft 51 as the rotor 11 rotates.

[0017] As shown in FIG. 4, the stator 12 is configured to be slidable in the vertical direction Z with respect to the back surface portion 20 of the base 10. The back surface portion 20 of the base 10 has a long hole (rail) 60 in the vertical direction Z, and the stator 12 has a slider 61 that fits into the hole 60 and is movable up and down within the hole 60.

[0018] The opening / closing mechanism 13 shown in FIG. 1 is configured to move the stator 12 with respect to the rotor 11 and open and close the tube handling portion 30 between the stator 12 and the rotor 11. As shown in FIG. 4, the opening / closing mechanism 13 has, for example, a lever 80, a rotating shaft 81, and a cam member 82.

[0019] The lever 80 is disposed in a groove 90 provided in the upper portion of the stator 12. The proximal end of the lever 80 is connected to a rotating shaft 81 that extends in the front-rear direction X at the center of the stator 12 in the left-right direction Y. The lever 80 can rotate around the rotating shaft 81 in a vertical plane (in the Y-Z plane) including the left-right direction Y.

[0020] As shown in FIGS. 4 and 5, the rotating shaft 81 penetrates from the stator 12 to the back surface side of the back surface portion 20 of the base 10. As shown in FIG. 5, the front portion of the rotating shaft 81 is rotatably connected to the stator 12. The rotating shaft 81 penetrates a long hole 91 provided in the back surface portion 20 of the base 10 in the vertical direction Z. As shown in FIGS. 5 and 4, the rear portion of the rotating shaft 81 is fixed to the cam member 82.

[0021] The cam member 82 is disposed in a recess 92 provided in the back surface portion 20 of the base 10. The cam member 82 has a disc shape and is rotatably in contact with the upper surface wall 92a and the lower surface wall 92b of the recess 92.

[0022] As shown in FIGS. 6 and 7, by rotating the lever 80 to the left when viewed from the front, the rotating shaft 81 rotates and the cam member 82 rotates. As a result, the stator 12 is pushed upward with respect to the base 10 via the rotating shaft 81 (the stator 12 moves to the second position). At this time, as shown in FIG. 7, the lower surface wall 40 of the stator 12 and the rotor 11 are separated from each other, and the tube handling portion 30 is opened.

[0023] As shown in FIG. 5, the base 10 includes a pressing member 95 that presses the lower portion of the stator 12 forward. The pressing member 95 is fixed to the back surface portion 20 of the base 10 and is provided at the lower portion of the back surface portion 20 away from the rotating shaft 81. The pressing member 95 can press the stator 12 forward by the biasing force of a spring. By pressing the lower portion of the stator 12 forward, the gap between the base 10 and the stator 12 above can be reduced.

[0024] As shown in FIGS. 5 and 1, by rotating the lever 80 to the right when viewed from the front, the rotating shaft 81 rotates and the cam member 82 rotates. As a result, the stator 12 is pushed downward with respect to the base 10 via the rotating shaft 81 (the stator 12 moves to the first position). At this time, as shown in FIG. 1, the lower surface wall 40 of the stator 12 and the rotor 11 approach each other, and the tube handling portion 30 is closed.

[0025] As shown in FIG. 7, tube fixing portions 100 for fixing tubes are provided on the left and right sides of the stator 12. The tube fixing portion 100 has an inlet holding portion 110 that sandwiches and holds the tube on the inlet side of the tube handling portion 30, and an outlet holding portion 111 that sandwiches and holds the tube on the outlet side of the tube handling portion 30. As shown in FIG. 1, since the rotor 11 rotates clockwise when viewed from the front, the left side of the stator 12 becomes the inlet side (upstream side of the tube) of the tube handling portion 30, and the right side of the stator 12 becomes the outlet side (downstream side of the tube) of the tube handling portion 30. Viewed from a different perspective, since the direction in which the liquid is fed is from left to right, the left side of the stator 12 becomes the inlet side (upstream side of the tube) of the tube handling portion 30, and the right side of the stator 12 becomes the outlet side (downstream side of the tube) of the tube handling portion 30.

[0026] As shown in FIG. 8, the inlet holding portion 110 has a first surface 120 and a second surface 121 that face each other with the tube therebetween. The stator 12 has a clamping member 130 that protrudes downward at the left (inlet side) end when viewed from the front, and the first surface 120 is provided at the lower end of the clamping member 130. The first surface 120 moves up and down by the opening and closing mechanism 13. The bottom 21 of the base 10 has a clamping member 131 that is exposed upward at the left (inlet side) end when viewed from the front, and the second surface 121 is provided at the upper end of the clamping member 131. The first surface 120 (clamping member 130) and the second surface 121 (clamping member 131) are offset and close to each other in the left-right direction Y, and the first surface 120 (clamping member 130) is arranged inside (right side) of the second surface 121 (clamping member 131).

[0027] As shown in FIGS. 8 and 9, the first surface 120 has an upwardly concave U-shape. The second surface 121 has a downwardly concave V-shape. As shown in FIG. 9, when the stator 12 is lowered by the opening / closing mechanism 13 (when the stator 12 moves to the first position), a gap D1 having a certain distance L1 is formed between the first surface 120 and the second surface 121. Note that the distance L1 of the gap D1 is the vertical distance Z between the position where the first surface 120 and the second surface 121 are farthest apart, that is, the uppermost point of the first surface 120 and the lowermost point of the second surface 121.

[0028] As shown in FIG. 10, the outlet holding portion 111 has a third surface 150 and a fourth surface 151 that face each other and sandwich the tube therebetween. The stator 12 has a clamping member 160 that protrudes downward at the right end (outlet side) when viewed from the front. The third surface 150 is provided at the lower end of the clamping member 160. The third surface 150 moves up and down by the opening / closing mechanism 13. The bottom 21 of the base 10 has a clamping member 161 that is exposed upward at the right end (outlet side) when viewed from the front. The fourth surface 151 is provided at the upper end of the clamping member 161. The third surface 150 (clamping member 160) and the fourth surface 151 (clamping member 161) are offset and close to each other in the left-right direction Y, and the third surface 150 (clamping member 160) is disposed inside (left side) of the fourth surface 151 (clamping member 161).

[0029] As shown in FIGS. 10 and 11, the third surface 150 has an upwardly concave U-shape. The fourth surface 151 has a downwardly concave V-shape. Note that the shapes of the third surface 150 and the fourth surface 151 may be other shapes. As shown in FIG. 11, the third surface 150 and the fourth surface 151 form a gap D2 when fixing the tube. That is, when the stator 12 is lowered by the opening / closing mechanism 13 (when the stator 12 moves to the first position), a gap D2 having a certain distance L2 is formed between the third surface 150 and the fourth surface 151. Note that the distance L2 of the gap D2 is the distance in the vertical direction Z between the position where the third surface 150 and the fourth surface 151 are farthest apart, that is, the uppermost point of the third surface 150 and the lowermost point of the fourth surface 151.

[0030] The inlet holding portion 110 and the outlet holding portion 111 are configured such that the gap D1 on the inlet side is smaller than the gap D2 on the outlet side. That is, the medical pump 1 has a left-right asymmetric structure in the inlet holding portion 110 and the outlet holding portion 111. Further, the tube fixing portion 100 is configured such that the force P1 with which the inlet holding portion 110 holds the tube is greater than the pulling force P2 of the tube due to the operation of the medical pump 1 (P1 > P2). Further, the tube fixing portion 100 is configured such that the force P3 with which the outlet holding portion 111 holds the tube is smaller than the pushing force P4 of the tube due to the operation of the medical pump 1 (P3 < P4). The holding force P1 may be greater than 2 N, may be greater than 10 N, and may be smaller than 20 N. The holding force P3 may be smaller than 2 N, and may be further smaller than 1 N.

[0031] Here, the pulling force P2 and the pushing force P4 of the tube were measured in the following manner. FIG. 12 is a diagram for explaining the measuring method of the pulling force P2 and the pushing force P4. The pump 1a is a pump used for measuring the pulling force P2 and the pushing force P4. For example, it is the pump 1 with the clamping members 130 and 160 removed as described above. By removing the clamping members 130 and 160 from the pump 1, the holding force due to clamping the tube from the vertical direction is not allowed to act. A load cell A1 is attached to the tube T1 installed in such a pump 1a. Then, the pump 1 is operated, the load at this time is measured, and the measured value is taken as the pulling force P2 and the pushing force P4.

[0032] As shown in FIGS. 8 and 9, the tube fixing portion 100 has a tube insertion port 200 and a guide portion 201 that guides the tube from the tube insertion port 200 to the inlet holding portion 110. The tube insertion port 200 is formed between the front end portion 210 on the left side of the stator 12 and the front end portion 211 on the left side of the bottom portion 21 of the base 10. The insertion port 200 is provided at a position higher than the second surface 121. The guide portion 201 has an inclined surface 220 connected to the second surface 121 from the front end portion 211 of the insertion port 200. As shown in FIG. 8, an inclined surface 221 may be formed between the front end portion 210 of the stator 12 and the first surface 120, with the front end portion 210 side of the stator 12 being higher and the first surface 120 side being lower. The inclined surface 221 may be formed substantially parallel to the inclined surface 220.

[0033] As shown in FIGS. 8 and 9, the tube fixing portion 100 includes a restraining portion 225 that suppresses the tube from shifting and being held on the opposite side of the tube insertion port 200 from the inlet holding portion 110. The restraining portion 225 has a vertical wall 226 formed at the rear end portion on the left side of the bottom portion 21 of the base 10. The vertical wall 226 stands upright upward from the rear end of the second surface 121.

[0034] As shown in FIGS. 10 and 11, the tube fixing portion 100 has a tube insertion port 230 and a guide portion 231 that guides the tube from the tube insertion port 230 to the outlet holding portion 111. The tube insertion port 230 is formed between the front end portion 250 on the right side of the stator 12 and the front end portion 251 on the right side of the bottom portion 21 of the base 10. The insertion port 230 is provided at a position higher than the fourth surface 151. The guide portion 231 has an inclined surface 260 connected to the fourth surface 151 from the front end portion 251 of the insertion port 230. As shown in FIG. 10, an inclined surface 261 may be formed between the front end portion 250 of the stator 12 and the third surface 150, with the front end portion 250 side of the stator 12 being higher and the third surface 150 side being lower. The inclined surface 261 may be formed substantially parallel to the inclined surface 260.

[0035] As shown in FIGS. 10 and 11, the tube fixing portion 100 includes a restraining portion 270 that suppresses the tube from being displaced and held on the opposite side of the tube insertion port 230 from the outlet holding portion 111. The restraining portion 270 has a vertical wall 271 formed at the rear end portion on the right side of the bottom portion 21 of the base 10. The vertical wall 271 stands upright upward from the rear end of the fourth surface 151.

[0036] When the medical pump 1 configured as described above is used, first, as shown in FIG. 7, the lever 80 is rotated to the left, the stator 12 is moved upward by the opening and closing mechanism 13, and the tube handling portion 30 is opened. Next, as shown in FIG. 13, the tube T is disposed in the tube handling portion 30 between the stator 12 and the rotor 11. On the inlet side of the tube handling portion 30, the tube T is inserted from the tube insertion port 200 and disposed between the first surface 120 and the second surface 121 of the inlet holding portion 110. Also, on the outlet side of the tube handling portion 30, the tube T is inserted from the tube insertion port 230 and disposed between the third surface 150 and the fourth surface 151 of the outlet holding portion 111.

[0037] Note that the tube T may be connected to other tubes on the upstream and downstream sides of the medical pump 1. That is, the tube T installed in the medical pump 1 may be a tube different from the upstream tube and the downstream tube. The tube T, the upstream tube, and the downstream tube may be connected by a joint. In that case, the joint and the tube may be fixed by a binding band. The tube T may be a tube of a different material and different diameter from the upstream tube and the downstream tube. The tube T may have higher pressure resistance than the upstream tube and the downstream tube. The tube T may have a thicker wall and a smaller inner diameter than the upstream tube and the downstream tube. The material of the tube T may be a thermoplastic elastomer, and the materials of the upstream tube and the downstream tube may be polyvinyl chloride (PVC).

[0038] Next, as shown in FIG. 1, when the lever 80 is rotated to the right, the stator 12 is moved downward by the opening / closing mechanism 13, and the tube handling portion 30 is closed. At this time, as shown in FIG. 14(a), on the inlet side of the tube handling portion 30, the first surface 120 and the second surface 121 of the inlet holding portion 110 hold the tube T therebetween. As shown in FIG. 14(b), on the outlet side of the tube handling portion 30, the third surface 150 and the fourth surface 151 of the outlet holding portion 111 hold the tube T therebetween. The gap D1 that sandwiches the tube T on the inlet side of the tube handling portion 30 is smaller than the gap D2 that sandwiches the tube T on the outlet side of the tube handling portion 30, and the tube T is held with a stronger force on the inlet side than on the outlet side. The movement of the tube T in the front-rear direction X and the up-down direction Z is restricted in the inlet holding portion 110 and the outlet holding portion 111. The restriction of the movement of the tube T in the left-right direction Y by the outlet holding portion 111 is weaker than the restriction of the movement of the tube T in the left-right direction Y by the inlet holding portion 110.

[0039] When the medical pump 1 operates, the rotor 11 rotates, and the roller 50 handles the tube T in the tube handling portion 30. Thereby, the liquid in the tube T is pumped from the inlet side toward the outlet side.

[0040] According to this embodiment, the gap D1 of the inlet holding portion 110 when the tube fixing portion 100 of the medical pump 1 holds the tube on the inlet side of the tube handling portion 30 is configured to be smaller than the gap D2 of the outlet holding portion 111 when holding the tube on the outlet side of the tube handling portion 30. Thereby, while holding the tube on the inlet side and the outlet side, the degree of freedom of movement of the tube can be given on the outlet side. As a result, when the tube is handled and pulled by the operation of the medical pump 1, the friction generated between the tube fixing portion 100 and the tube can be reduced. Further, according to the tube fixing portion 100 of the present embodiment, the friction between the rotor 11 and the stator 12 and the tube can be reduced. As a result, wear of the tube can be suppressed.

[0041] The tube fixing portion 100 is configured such that the force P1 by which the inlet holding portion 110 holds the tube is larger than the pulling force P2 of the tube due to the operation of the pump, and the force P3 by which the outlet holding portion 111 holds the tube is smaller than the pushing force P4 of the tube due to the operation of the pump. Thereby, the tube can be firmly fixed on the inlet side, and a little degree of freedom of movement of the tube can be given on the outlet side. As a result, the friction generated between the tube fixing portion 100 and the tube can be reduced. Since the tube fixing portion 100 is configured such that the force P1 by which the inlet holding portion 110 holds the tube is larger than the pulling force P2 of the tube due to the operation of the pump, the entrainment of the tube into the tube handling portion 30 can be suppressed.

[0042] The inlet holding portion 110 has a first surface 120 and a second surface 121 that face each other and sandwich the tube therebetween, and the outlet holding portion 111 has a third surface 150 and a fourth surface 151 that face each other and sandwich the tube therebetween. Thereby, the tubes on the inlet side and the outlet side can be appropriately held.

[0043] The stator 12 includes the first surface 120 of the inlet holding portion 110 and the third surface 150 of the outlet holding portion 111, and the base 10 includes the second surface 121 of the inlet holding portion 110 and the fourth surface 151 of the outlet holding portion 111. Therefore, by moving the stator 12, the tube can be properly held.

[0044] Since the first surface 120, the second surface 121, the third surface 150, and the fourth surface 151 have a V-shaped or U-shaped configuration, the tube can be properly held.

[0045] The first surface 120 and the third surface 150 have a U-shaped configuration, and the second surface 121 and the fourth surface 151 have a V-shaped configuration. As a result, displacement of the tube in the front-rear direction X is suppressed, so that the tube is easily held at a predetermined position of the inlet holding portion 110 or the outlet holding portion 111. In addition, since the second surface 121 and the fourth surface 151 have a V-shaped configuration, as shown in FIGS. 8 and 10, it becomes easier for the user to view the installation position of the tube and to install the tube. Further, since the first surface 120 and the third surface 150 have a U-shaped configuration, even if the tube is pulled forward, the tube is less likely to come off from the inlet holding portion 110 or the outlet holding portion 111.

[0046] The tube fixing portion 100 includes a tube insertion port 200 and a guide portion 201 that guides the tube from the tube insertion port 200 to the inlet holding portion 110. This facilitates the user's operation of installing the tube in the inlet holding portion 110.

[0047] The tube fixing portion 100 includes a tube insertion port 230 and a guide portion 231 that guides the tube from the tube insertion port 230 to the outlet holding portion 111. This facilitates the user's operation of installing the tube in the outlet holding portion 111.

[0048] The tube fixing portion 100 includes a suppression portion 225 that suppresses the tube from being displaced and held on the opposite side of the tube insertion port 200 from the inlet holding portion 110. Thereby, the tube can be accurately and reliably installed at a predetermined position of the inlet holding portion 110.

[0049] The tube fixing portion 100 includes a restraining portion 270 that restrains the tube from being displaced and held on the opposite side of the tube insertion port 230 from the outlet holding portion 111. Thereby, the tube can be accurately and reliably installed at a predetermined position of the outlet holding portion 111.

[0050] As shown in FIG. 15, the medical pump 1 may further include an adjusting portion 400 that adjusts the size of the gap D1 of the inlet holding portion 110. The adjusting portion 400 includes an adjusting screw 410 and a lifting member 411 that moves up and down by the rotation of the adjusting screw 410. The lifting member 411 is provided inside (right side) of the inlet holding portion 110. When the lower surface of the lifting member 411 protrudes below the first surface 120, it can press the tube and adjust the size of the gap D1. Thereby, the holding force of the tube on the inlet side can be finely adjusted, and the tube can be reliably held.

[0051] Each of the above embodiments is described for the purpose of illustration and is not intended to limit the scope of the present disclosure. Each of the above embodiments can be variously modified without departing from the scope and spirit of the present disclosure. For example, some components in one embodiment can be added to another embodiment. Also, some components in one embodiment can be replaced with corresponding components in another embodiment.

[0052] For example, the configurations of the base 10, the rotor 11, and the stator 12 of the medical pump 1 are not limited to the configurations in the above embodiment. The configuration of the tube holding portion 100 is not limited to the configuration in the above embodiment. The first surface 120 and the third surface 150 may have a V shape, and the second surface 121 and the fourth surface 151 may have a U shape. The first surface 120, the second surface 121, the third surface 150, and the fourth surface 151 may all have a V shape, and the first surface 120, the second surface 121, the third surface 150, and the fourth surface 151 may all have a U shape. Note that the shapes of the first surface 120, the second surface 121, the third surface 150, and the fourth surface 151 are not limited to the U shape and the V shape, and may be other shapes.

Industrial Applicability

[0053] The present invention is useful when providing a medical pump capable of suppressing wear of a tube.

Explanation of Signs

[0054] 1... medical pump, 10... base, 11... rotor, 12... stator, 30... tube handling part, 50... roller, 100... tube fixing part, 110... inlet holding part, 111... outlet holding part, 120... first surface, 121... second surface, 150... third surface, 151... fourth surface, D1... gap, D2... gap, T... tube

Claims

1. A medical pump, comprising: a rotor having a plurality of rollers and configured to be rotatable; a stator configured to form a tube handling portion between the rotor; a tube fixing portion having an inlet holding portion that holds the tube while sandwiching it on the inlet side of the tube handling portion, and an outlet holding portion that holds the tube while sandwiching it on the outlet side of the tube handling portion; The tube fixing portion is configured such that a gap of the inlet holding portion when holding the tube on the inlet side of the tube handling portion is smaller than a gap of the outlet holding portion when holding the tube on the outlet side of the tube handling portion.

2. The tube fixing portion is configured such that a force by which the inlet holding portion holds the tube is greater than a pulling force of the tube due to the operation of the pump, and a force by which the outlet holding portion holds the tube is smaller than an extrusion force of the tube due to the operation of the pump. The medical pump according to claim 1.

3. The inlet holding portion has a first surface and a second surface that face each other and sandwich the tube therebetween. The outlet holding portion has a third surface and a fourth surface that face each other and sandwich the tube therebetween. The medical pump according to claim 1.

4. Further comprising a base configured to hold the stator, The stator is configured to move relative to the base and advance and retreat with respect to a part of the base, The stator includes the first surface of the inlet holding portion and the third surface of the outlet holding portion, The base includes the second surface of the inlet holding portion and the fourth surface of the outlet holding portion. The medical pump according to claim 3.

5. Further comprising an opening and closing mechanism configured to advance and retreat the stator with respect to the rotor to open and close the tube handling portion, The opening and closing mechanism advances and retreats the stator with respect to a part of the base. The medical pump according to claim 4.

6. The first surface, the second surface, the third surface, and the fourth surface have a V shape or a U shape. The medical pump according to claim 3.

7. The first surface and the third surface have a U shape, The second surface and the fourth surface have a V shape. The medical pump according to claim 6.

8. The tube fixing portion includes: a tube insertion port The medical pump according to claim 1, further comprising a guide portion that guides the tube from the tube insertion port to the inlet holding portion.

9. The tube fixing portion comprises a tube insertion port, and a guide portion that guides the tube from the tube insertion port to the outlet holding portion. The medical pump according to claim 1.

10. The tube fixing portion comprises a tube insertion port, and a restraining portion that restrains the tube from being displaced and held on the opposite side of the tube insertion port from the inlet holding portion. The medical pump according to claim 1.

11. The tube fixing portion comprises a tube insertion port, and a restraining portion that restrains the tube from being displaced and held on the opposite side of the tube insertion port from the outlet holding portion. The medical pump according to claim 1.

12. The medical pump according to claim 1, further comprising an adjusting portion that adjusts the size of the gap of the inlet holding portion.

13. A medical pump, comprising: a rotor having a plurality of rollers and configured to be rotatable; a stator configured to form a tube handling portion between the rotor; a tube fixing portion having an inlet holding portion that sandwiches and holds the tube on the inlet side of the tube handling portion and an outlet holding portion that sandwiches and holds the tube on the outlet side of the tube handling portion; The tube fixing portion is configured such that the force with which the outlet holding portion holds the tube is smaller than the force with which the inlet holding portion holds the tube.

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