JPH06154310A - Tube drawing direction variable pump and tube drawing direction variable blood pump and artificial dialysis apparatus using this blood pump - Google Patents

Abstract

PURPOSE:To easily mount and disengage an elastic tube by forming a notched part of a specified length along a circumferential direction in the outer peripheral part of a rotor and the rotation/stop of this rotor by detecting the arrival of this notched part at a prescribed Position. CONSTITUTION:The rotor 34 is slowly rotated clockwise by driving of a motor at the time of mounting the elastic tube 3. This rotor 34 is stopped when the magnet 48 of the rotor 34 faces a magnetism detecting sensor 47 and this magnetism detecting sensor 47 emits an output signal. Since the notched part 49 of the rotor 34 comes to the position where the notched part faces the suction side groove 51a of a casing 1 and, therefore, tube retaining arms 52a, 2b are pulled toward the operator and are erected; thereafter, the suction side end 3a of the elastic tube is mounted to the suction side groove 51a and the discharge side end 3b is drawn out of the notched part 49. After the retaining arm 53a is returned to its home position, the rotor 34 is rotated clockwise and the elastic tube 3 is moved and guided along an inner peripheral surface 2a of the casing, by which the elastic tube is mounted into the elastic tube mounting space.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a pump using an elastic tube and a hemodialysis apparatus using this pump, and more particularly, a pump in which the elastic tube can be easily attached to and detached from the pump body, Also, the present invention relates to a hemodialysis device used as a blood pump for circulating this pump between a human body and a dialysis device provided outside the human body.

[0002]

2. Description of the Related Art Conventionally, a so-called tube pump, which sequentially compresses liquid in an elastic tube from the outside in a liquid-sending direction to send a liquid, is a spiral pump or a reciprocating pump that requires a seal mechanism between a pump casing and a rotating shaft. Unlike dynamic pumps,
Since no sealing mechanism is required between both members, there is an advantage that foreign matter is not mixed into the liquid-sending fluid from the outside.
For this reason, tube pumps are widely used in the medical field for delivering blood, dialysate, etc. to the human body, the analytical field for delivering liquids containing chemical substances, the food field for delivering soy sauce, edible oil, etc. Has been done.

However, the tube pump is unavoidably deteriorated because the elastic tube is an elastic body as the name implies, and the material, outer diameter and wall thickness of the tube pump are inevitable. Because of the difference, etc., it is necessary to carry out the attachment / detachment work to replace with a new one or an optimum type.
When this tube pump is used as a blood pump used in an artificial dialysis machine, due to restrictions on the bed and pump layout, inconvenience caused by frequent puncture of the shunt needle on the same arm of the patient, etc. The requirement is that the can be changed to either the right or the left side.

Conventionally, as such a pump whose tube withdrawing direction can be varied, the pumps disclosed in Japanese Utility Model Laid-Open No. 4-51957 and Japanese Utility Model Laid-Open No. 60-46689 are known.

As shown in the plan view of FIG. 15, the former pump has a casing 1 having a recess 2 having a substantially arcuate inner peripheral surface 2a, and an inlet groove 2b and an outlet groove 2c connected to the recess 2.
Are continuously provided, and the rotor 4 is removably attached to and detached from the motor shaft 3 protruding into the recess 2. The rotor 4 includes a rotating body 5 fixed to the motor shaft 3, a pair of support arms 7 having a fulcrum 7a at both ends of the rotating body and a rotatable roller 6 at the tip thereof, and the supporting arms 7 via the rollers. It is configured integrally with a compression spring 9 that presses against the elastic tube 8. Elastic tube 8
Is inserted into the space formed between the casing inner peripheral surface 2a and the rotor 4 with both ends thereof being drawn out of the casing from the inlet / outlet grooves 2b, 2c. While the tube 8 is sequentially closed by the pressing force of the compression spring 9, the rotor 4 rotates in the direction of the arrow in FIG.

When the rotor 4 is reversed, the casing 1 is reversed 180 degrees and fixed by the pin 10,
The tube pull-out direction is changed by removing the rotor 4 from the motor shaft 3, reversing it, and fixing it again to the motor shaft.

Although not shown, the latter pump is formed integrally with a disk having notches on both sides of the rotor 4 in order to facilitate the work of mounting the elastic tube. By hooking the tube on the notch and rotating it, the tube mounting work by the operator is simplified.

[0008]

However, in the former pump, when the elastic tube 8 is inserted into the concave portion 2 of the casing 1, the two support arms 7 having the rollers 6 at the ends are always compressed by the compression spring 9. Since the tube is being pressed, the operator first contracts the two support arms 7 against each other at the same time so as to approach each other at the same time, against the compression force of the compression spring 9, and thereafter, is formed between the recess 2 of the casing 1 and the roller 6. The tube 8 must be mounted in a wound manner.
The tube mounting work is extremely difficult, and it takes a long time and skill to mount the tube properly. Therefore, this pump cannot cope with the situation very promptly in the case where there is a restriction on the layout or it is necessary to change the drawing direction of the tube depending on the patient as described above.

The latter pump has a cutout portion for hooking the tube on the outer peripheral portion of the rotor, so that the attaching / detaching work is improved to some extent, but the tube is hooked on the cutout portion to rotate the rotor. There is a drawback that the tube moves along with the rotor. In addition, since it is very difficult to stop the rotor at the end of mounting and it takes time to stop, the tube moves along with the rotor as in the former pump, so the tube end is set to an appropriate position. There was a drawback that I could not.

The present invention has been made in view of the above circumstances, and elastic tubes of different types such as different materials and thicknesses can be easily attached and detached without requiring skill and labor, and the elastic tube can be pulled out. It is an object of the present invention to provide a tube withdrawal direction variable pump, a tube withdrawal direction variable blood pump, and an artificial dialysis device using this blood pump, the direction of which can be easily changed as necessary.

[0011]

In order to achieve the above object, the tube withdrawal direction variable pump according to the present invention has a recess having a substantially arcuate inner peripheral surface, and an inlet groove and an outlet groove connected to the recess. A casing having, a motor having a drive shaft protruding from the center of the arc-shaped inner peripheral surface, an elastic tube arranged along the inner peripheral surface of the casing and both the grooves, and both ends thereof being drawn to the outside. And a rotor having a plurality of rollers for pressing the elastic tube and being detachably fixed to the drive shaft of the motor, and by reversing the casing and the rotor, the direction of pulling out the elastic tube (A) A notch having a constant length along the circumferential direction is formed between the rollers of the plurality of rollers and on the outer peripheral portion of the rotor in the variable tube withdrawing direction variable pump. And (b) a tube retainer that fixes the suction side end of the elastic tube to the inlet groove of the casing, and (c) that the notch of the rotor moves to a position that opposes the inlet groove of the casing. Initial position detecting means for detecting, (d) end position detecting means for detecting that the notch of the rotor has moved to a position facing the outlet groove of the casing, and (e) the initial position detecting means and end position. A controller for controlling a rotation angle of the motor is provided between the detecting means and the detecting means.

Further, the tube withdrawal direction variable pump can be used as a tube withdrawal direction variable blood pump having exactly the same structure for feeding blood.

Further, an artificial dialysis apparatus can be constructed by using the above-mentioned tube withdrawal direction variable blood pump as a blood delivery pump.

[0014]

According to the first aspect of the invention, first, when the operator presses the reset switch, the rotor is rotated by the reset command from the controller, and the notch of the rotor and the inlet groove of the casing face each other at the initial position. The detection means detects this and outputs it to the controller, and the controller stops the rotor. Next, the suction side end of the elastic tube is fixed to the bottom of the inlet groove of the casing by the tube retainer, and the elastic tube is reliably hooked on the notch of the rotor. When an operator presses the start switch in this state, the rotor rotates in response to a command from the controller, the tube does not get caught between the tip of the notch of the rotor and the arcuate recess, and the starting point of the notch moves the elastic tube. A roller, which is guided in the substantially circular arc-shaped recess and follows, closes the elastic tube against the inner peripheral surface of the recess. When the cutout portion of the rotor is rotated to a position facing the outlet groove of the casing, the final position detection means detects this, and the rotor is stopped by a command from the controller. Therefore, an operator can automatically mount the elastic tube in the space formed between the inner peripheral surface of the casing and the outer peripheral surface of the rotor by simply pressing the switch.

Next, when the elastic tube is taken out from the above space, the suction side end of the tube is pulled out from the inlet groove of the casing and the notch of the rotor, and the rotor is rotated with the tube retainer inserted in the inlet groove again. Since the tube does not bite between the tip of the notch of the rotor and the arcuate recess, the notch of the rotor rotates while flipping up the tube from the lower side to the upper side. Therefore, it is removed from within the recess.

When changing the pull-out direction of the elastic tube, the rotor is first turned upside down and fixed to the drive shaft of the motor. Next, in order to reverse the position of the inlet / outlet groove of the casing, the casing position is reversed by 180 degrees. By the above operation, the pull-out direction of the tube is changed.

According to the second aspect of the present invention, blood can be delivered by the same action as above.

Further, in the invention of claim 3, as described above, foreign matter does not enter the blood inside the elastic tube and the withdrawing direction can be easily changed, so that a preferable action as an artificial dialysis device can be obtained.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described with reference to the drawings.

Embodiment 1 FIG. 1 is a plan view of a tube withdrawing direction variable pump according to the present invention, in which a lid 1a of a casing 1 has a pin 1c.
1 shows a state of being opened to the left with the fulcrum as a fulcrum.
3 is a sectional view taken along the line X-X of FIG.
FIG. 3 is a sectional view of the rotor 34 of FIG.

In FIG. 1, a casing 1 is a base 2
5 is fixed by several screws 26 (only one is shown in the figure), and a substantially cylindrical recess 2 having an inner peripheral surface 2a is formed in the center thereof, and the rotor 34 is housed in this recess. It is stored. A suction side groove 51a and a discharge side groove 51b for drawing out the elastic tube 3 to the right side are formed on the right side of the casing 1, and the inner peripheral surface 2a of the recess 2 and the groove 5 are formed.
The inner peripheral surfaces 51aa and 51bb of the la and 51b form a continuous smooth smooth horseshoe-shaped curve. That is, the elastic tube 3 is mounted in the arc-shaped space formed between the inner peripheral surface 2a of the recess 2 and the rotor 34 and the continuous space formed by the grooves 51a and 51b. (Hereinafter, these continuous spaces are referred to as "elastic tube mounting space".).

As shown in FIG. 2, a motor 27 is fixed to the back surface of the base 25. The drive shaft 30 of the motor 27 projects from the back surface of the base 25 into the recess 2 and is rotatably supported by a bearing 1d fixed to the casing 1.

A rotary shaft 32 for driving the rotor 34 is fixed to the tip of the drive shaft 30 by a key 30a. The outer diameter of the rotating shaft 32 is such that it can be easily inserted into and removed from the rotating hole 42 of the rotor 34, and the square base 31 and the engagement groove 33 that engages with the balls 43 of the rotor 34 are provided. Are formed. Reference numeral 39 denotes a limit switch. When the screw 26 shown in FIG. 2 is completely tightened, its tip comes into contact with the lever to output an ON signal to the controller 60, and when changing the tube drawing direction. , The position of screw 26 is 18
Since it moves 0 degrees, an OFF signal is output, and the rotation direction of the rotor is also automatically reversed.

With respect to the structure of the rotor 34, further reference is made to the plan view of FIG. 4, FIG. 5 showing a state in which the disk 46a on the front side is removed from FIG. 4, and FIG. 6 which is a right side view of FIG. explain in detail.

As shown in FIG. 5, the rotor 34 has a fan-shaped member 35 substantially fan-shaped on the left and right of the rotation hole 42.
a rotating body 35 having a and 35b, a pair of support arms 37a and 37b swinging about a swing shaft 36 provided at a constant distance from the rotation hole 42, and a screw shaft at the tip of each support arm. Rollers 6a and 6b rotatably provided around 45 and supporting arms 37a and 37b
And two compression springs 38 provided between the rotary body 35 and the rotating body 35, and a pair of disks 46a, 46 that sandwich these members from both sides.
b and the disks 46a and 46b are fixed to the four screw holes 35c provided in the rotating body 35 by screws 46c to be integrated.

As shown in FIG. 6, the rotating body 35 has grooves 35c and 35d for guiding the elastic tube 3 on the side surfaces of the fan-shaped members 35a and 35b, and the outer peripheral surfaces of these two grooves. Form part of a circumferential surface centered on the rotation hole 42. That is, the space between the outer peripheral surfaces of the grooves 35c and 35d and the arcuate inner peripheral surface 2a of the casing 1 corresponds to the mounting space of the elastic tube 3, and the cross-sectional shape of this space is substantially circular and its inner diameter is , Elastic tube outer diameter 1.0 to
It is slightly larger than 1.2 times. Also, the groove 35
The widths of c and 35d are slightly larger than the outer diameter of the elastic tube in order to efficiently transfer the liquid inside the elastic tube.
It is preferably 1.2 to 2.0 times, and 1.3 to 1.5
It is more preferable to double the number. A ball 43 that engages with the groove 33 of the rotary shaft 32 is provided in the rotation hole 42 of the rotating body 35. Is slightly pushed out from the inner peripheral surface of the. Therefore,
When the rotary hole 42 of the rotor 34 is inserted into the rotary shaft 32, the balls 43 fit into the grooves 33 of the rotary shaft 32, and the rotor 34
Can be locked to the rotary shaft 32 of the casing 1.
The pressing force of the compression spring 44 is adjusted in advance so that the rotary body 35 can be manually inserted and removed.

The support arms 37a and 37b are the rotating body 35.
It is composed of two levers, one on the front and the other on the back, so that its base is rotatable by a swing shaft 36 standing upright from a rotating body 35, and its tip is substantially U-shaped. The two levers are integrally connected by a back wall portion 37c formed in the above, and rollers 6a and 6b are rotatably supported by a screw shaft 45.

The compression springs 38 are respectively provided on the support arms 37.
It is built in between the back wall part 37c of a, 37b and the cylindrical hole 35e provided in each fan-shaped member 35a, 35b of the rotating body 35, and the inside of the compression spring 38 is erected from the back wall part 37c. The stud bolt 35f penetrates through and a nut 35g is attached to the tip of the bolt. By the pressing force of these two compression springs 38, the support arm 37
Since a and 37b are respectively urged outward, the rollers 6a and 6b urge the elastic tube 3 against the inner peripheral surface 2a of the casing 1 by the urging force to close the rollers. can do.

Each of the disks 46a and 46b has a square hole 41 at the center thereof for engaging with the base 31 of the rotary shaft 32, and the elastic tube 3 is mounted in the elastic tube mounting space in the vicinity of the support arm 37a. A cutout portion 49 is formed along the outer peripheral surface of the disk for easy operation. The shape of this notch is
In order to easily fit the elastic tube in the space,
The length of the roller 6b is 3 to 5 times the outer diameter of the elastic tube from the roller 6b in the direction of rotation about 40 degrees, and the width in the radial direction is slightly larger than the outer diameter of the elastic tube.
It is preferably about 1.5 times. Further, in order to facilitate insertion of the elastic tube, it is preferable that the notched surface of the disk has a rounded shape and that the surface be subjected to Teflon processing.

The outer diameter, wall thickness, material, etc. of the elastic tube 3 are not particularly limited, and may be appropriately selected in consideration of the physical properties, durability, and corrosion resistance of the liquid to be sent. However, silicone rubber, natural rubber, polyurethane rubber or the like can usually be used.

Returning to FIG. 1 again, 48b is a notch 4
A magnet embedded in the disk 46a, which is in front of the rotation direction of 9, is a magnetic sensor 47 provided between the suction side groove 51a and the discharge side groove 51b of the casing 1, and at a position where they face each other as shown in the figure. Magnetic sensor 47 is magnet 48
The detection signal of b is output to the controller 60, and these members 47 and 48b constitute the initial position detecting means of the present invention. This magnet 48 and magnetic sensor 4
The position of 7 is provided in such a positional relationship that the rotation of the rotor is stopped after both of them face each other, and the cutout portion 49 of the rotor and the suction side groove 51a of the casing coincide with each other at that time. The initial position detecting means is not limited to the above-mentioned aspect, and mechanical or electric type such as limit switch or proximity switch, or optical type detecting means such as a photoelectric tube may be used.

Both ends of the elastic tube 3 mounted in the elastic tube mounting space are projected to the outside of the casing 1, and the suction side end 3a is connected to the liquid supply fluid supply portion (not shown) and the discharge side end. The portion 3b is connected to a device (not shown) that requires liquid feeding by a joint 3c and a flexible hose 3d. Reference numerals 52a and 52b denote tube pressing arms for preventing the elastic tube 3 mounted in the elastic tube mounting space from coming off, and the suction side end 3a has a rod 5 fitted in the tube pressing mounting hole 52d.
A tube retainer 53 having 2e is provided, and both are configured to rotate about a pin 52c fixed to the casing 1 as a fulcrum. Tube holder mounting hole 52d
Is also provided on the tube pressing arm 52b, the tube pressing 53 is
It can be easily attached to and detached from both a and 52b. Further, the outer edge portion 5 of the tube retainer 53 shown in the figure
The shape of No. 4 is the same as or slightly larger than the curvature of the arcuate inner peripheral surface 2a.

The controller 60 controls the rotation of the motor 27,
The stop is controlled, and the torque when an abnormality occurs is detected to make an emergency stop. Therefore, after the magnetic sensor 47 and the magnet 48a face each other, a timer 61, which is a final position detecting means of the present invention for stopping the motor after turning by a certain angle, is incorporated. The end position detecting means for stopping the motor 27 after rotating by a certain angle may be the same as the initial position detecting means other than the timer. Further, the above-mentioned motor 27 may be constituted by a motor capable of controlling the rotation angle such as a rotary encoder without providing such a detection means. In short, the cutout portion 49 of the rotor 34 is the suction side groove 51.
What can be rotationally controlled between a and the discharge side groove 51b is included in the initial position detecting means and the final position detecting means of the present invention. Further, the controller 60 includes a support arm 37.
When an abnormal state such as bending of the elastic tube occurs during rotation of a and 37b, an abnormal torque detecting device 62 for detecting the abnormal torque is incorporated.

Next, the operation of the apparatus of this embodiment will be described with reference to FIGS.
~ It demonstrates concretely, referring to FIG.

(1) When the elastic tube 3 is attached First, the worker uses the joint 3c to connect the suction side end portion 3a of the new elastic tube 3 to the flexible hose 3.
Connect with d.

Next, when a reset signal is sent to the controller 60, the motor 27 is driven and the rotor 34 rotates clockwise. In this case, the rotation speed is preferably 7 to 15 rpm. When the magnet 48 of the rotor 34 faces the magnetic detection sensor 47, the rotor stops after the signal is sent from the magnetic sensor to the controller. This state is the state of FIG. 1, and the notch portion 49 of the rotor has the suction side groove 51 of the casing.
It faces a.

As shown in FIG. 7, the tube pressing arms 52a and 52b are pulled up and set up.

As shown in FIG. 8, the suction side end 3 a of the elastic tube is mounted in the suction side groove 51 a of the casing, and the blood discharge side end 3 b is pulled out from the cutout 49 of the rotor 34. Then, the tube pressing arm 52a is tilted to the original groove 51a, and the suction side end 3a is fixed.

Next, a signal is sent to the controller 60 to rotate the rotor clockwise. At the same time, the controller starts counting by the timer 61. As shown in FIG.
The elastic tube 3 is first pressed into the elastic tube mounting space by the starting point 49a of the cutout 49 of the rotor 34 preceding the roller 6b, and is guided to the casing inner peripheral surface 2a. Next, the roller 6b following the starting point 49a moves in the direction of the discharge side groove 51b while pressing and closing the elastic tube 3 along the inner peripheral surface 2a by the action of the elastic force of the compression spring 38. The elastic tube 3 is guided to an accurate inner circumferential surface position of the groove by the starting point 49a of the cutout portion 49, and is sequentially inserted into the elastic tube mounting space by the roller 6b.

As shown in FIG. 10, as the movement of the roller 6b progresses, the other roller 6a rotates while pressing the elastic tube 3 against the inner peripheral surface 2a.

The timer 61 times out, and the rotor 34 stops at the position shown in FIG. That is, the rotor automatically stops when the notch 49 comes into the discharge side groove 51b of the casing.

The tube pressing arm 52b is returned to the original state to fix the discharge side end 3b, and the discharge side end 3b is connected to the flexible hose 3d by the joint 3c. By the above operation, the pump 20 of the elastic tube 3
Installation work is completed. When the start switch (not shown) of the controller 60 is pressed again, the rotor 34 rotates, the blood in the elastic tube 3 is transferred from the suction side 3a of the tube to the discharge side 3b, and normal operation starts.

(2) When removing the elastic tube 3 When the elastic tube 3 is removed after the blood supply is completed, the following procedure is performed.

A reset signal is sent to the controller 60 to rotate the rotor 34, and after the magnet 48 and the magnetic sensor 47 face each other, the rotor is stopped at the position shown in FIG. The tube holding arm 52a is pulled toward you, and the elastic tube 3 arranged in the suction side groove 51a of the casing.
Pull out a from the suction side groove. Then, the tube pressing arm 52a is tilted back to the original state. On the other hand, the discharge side groove 51
The tube pressing arm 52b of b is pulled out from the groove and stands up. This state is the state shown in FIG. Send a start signal to the controller 60 to rotate the rotor 3
When 4 is rotated clockwise as shown in FIG. 13, the suction side end portion 3a of the elastic tube is flipped up one after another by the start point 49a of the cutout portion 49, so that from the suction side end portion to the discharge side end portion. It comes off from the inner peripheral surface 2a of the casing.

When the notch 49 comes into the discharge side groove 51 b of the casing 1, the controller times out and the rotor 34 stops. The operator takes out the entire elastic tube 3 to the outside of the casing.

(3) In the case of reversing the direction in which the elastic tube 3 is ejected In all of the above-described elastic tube attachment / detachment operations, the direction in which the elastic tube is pulled out is to the right of the casing 1, but when it is pulled out to the left. Performs the following operations.

First, as shown in FIG. 2 and FIG.
The rotor 34 is pulled out from the rotary shaft 32, the front and back thereof are inverted, and the rotor 34 is inserted again into the rotary shaft 32. The balls 43 of the rotor 34 fit into the grooves 33 of the rotary shaft 32, the square holes 41 of the disk 46 a fit into the rectangular base 31 of the rotary shaft 32, and the rotor 34 is fixed to the casing 1.

Next, when the screw 26 is loosened and pulled out,
Its tip is disengaged from the sensing lever of the limit switch 39, and at the same time, the signal is sent to the controller 60.

The drive shaft 30 of the motor 27 rotates in the direction opposite to the direction of the arrow in FIG.
4 is rotated in the direction opposite to the arrow in FIG. Here, if the rotor 34 is not turned upside down and only reverse rotation is performed, the repulsive force of the elastic tube 3 pressed by the roller 6a does not work in the direction of compressing the compression spring 38, so that the elastic tube 3
Cannot be closed with an appropriate pressing force.

A signal is sent to the controller at the position where the magnet 48b faces the magnetic sensor 47, and the controller stops the rotor 34 when the notch 49 and the casing suction side groove (the discharge side groove 51b in FIG. 1) match.

The operator reverses the casing 1 by 180 degrees so that the tube 3 is pulled out to the left side in the drawing, and tightens the screw 26 in the screw hole 28 of the base 28.

Until now, the suction side groove 51 a of the casing 1
The tube holder 53 attached to the tube holder 53 is removed from the tube holder arm 52a and replaced with the discharge side groove 51b. Upon completion of this operation, the suction side groove 51a of the casing 1 before the change of the tube drawing direction becomes the changed discharge side groove 51b, and the discharge side groove 51b becomes the suction side groove 51a and is reversed.

With the above operation, the rotation direction of the rotor 34 is reversed, and the elastic tube 3 is pulled out in the lower left side of FIG. 1 as the suction side groove 51a and the upper left side as the discharge side groove 51b. This means that the withdrawal direction of has been changed to the left. The procedure of the attaching / detaching operation of the elastic tube and the removing operation are exactly the same as those in the above items (1) and (2).

As described in the above items (1) to (3), the tube withdrawal direction variable pump 20 of this embodiment is
Unlike conventional pumps, attachment / detachment and its withdrawal direction can be changed without any labor when attaching the tube. That is, this embodiment 99p requires only a small amount of manual work such as opening / closing operations of the tube pressing arms 52a and 52b, hooking the tube to the casing notch 49, and inverting the rotor 34 and the casing 1. The elastic tube 3 can be easily attached to and detached from the elastic tube mounting space of the casing and the direction of pulling out the tube can be changed simply by pressing the switch button to give a signal to the controller 60. Further, since the rollers 6a, 6b are pressed against the inner peripheral surface 2a by the compression spring 38, a strong pressing force acts on the elastic tube 3 having a relatively large wall thickness and a high rigidity, while Since a small pressing force acts on the elastic tube 3 having a relatively small thickness and a low rigidity, the elastic tube 3 can be pressed with an appropriate pressing force regardless of the type of the elastic tube.

Further, when an abnormality such as bending of the elastic tube occurs during rotation of the support arms 37a and 37b, the abnormal torque detector 62 of the controller detects the abnormal torque and immediately stops the support arm. It is possible to prevent damage to the tube.

The fluid that can be sent by the variable tube withdrawal direction pump according to the present invention is not particularly limited, but there is a risk that foreign matter may get mixed into the elastic tube because the rotary shaft of the rotor does not have a shaft sealing mechanism. Since it does not exist at all, for example, as a liquid delivery pump in the medical field such as artificial dialysis equipment that draws blood from a patient into a dialyzer to remove waste products in the blood, soy sauce, food fields that deliver edible oil, etc. It is preferably applicable.

Embodiment 2 FIG. 14 shows the tube withdrawal direction variable pump 20 described in the first embodiment as a tube withdrawal direction variable blood pump 20.
It is a schematic diagram of one Example used as a and applied to the artificial dialysis device 63.

The embodiment apparatus 63 in the figure shows the whole artificial hemodialysis apparatus, and includes a shunt needle S for extracting blood from the left arm of the patient m, a blood pump 20a for sucking blood through the pipe p1, Aeration 21 in the blood sent from the pump via the pipe p2 is removed, and the waste product in the blood sent from the chamber 21 and the pipe p3 for suppressing the pressure fluctuation is replaced with a dialysate to obtain a fresh one. Artificial dialyzer 22 for blood, chamber 24 for temporarily storing the blood that has been artificially dialyzed and sent from pipe p4, bubble detector 26 for detecting whether or not there are bubbles in pipe p5, the entire dialysis apparatus In this case, a compression device 25 for closing the pipe p5 so as not to return blood to the human body when an abnormality occurs in the human body, and a shunt needle S for injecting fresh blood into the patient m are provided in this order. Connected to p1~p5 to form a circulation circuit of the blood. Further, the dialyzer 22 is connected to the artificial dialyzer 23 by a pipe p6 for supplying a fresh dialysate and a pipe p7 for feeding a waste dialysate, and the blood pump 20a is further connected when a bubble is detected. When any other abnormality occurs, the rotation is immediately stopped to stop the blood supply. Therefore, the pressure closing device 25, the bubble detector 26, and the wiring k1,
It is connected by k2. Incidentally, 27 is a syringe pump 27 for injecting heparin into the pipe p5 which is a fresh blood circuit.
And is connected to the pipe p8.

Here, the artificial dialysis device 63 of this embodiment is characterized by the blood pump 20a, and since the artificial dialysis device 23 itself has no difference from the configuration of the known artificial dialysis device, its specifics are as follows. Detailed description is omitted. As shown in FIG. 1, the blood pump 20a is mounted so that the suction side end 3a of blood is on the lower side and the discharge side end 3b is on the upper side in order to effectively remove the air mixed in the pipe p1. Preferably. With such an arrangement, blood pump 20a
Is preferably installed on the left side of the patient m, because the pipes p1 and p2 do not get complicated. Further, there is an effect that the amount of blood staying in the circulation circuit is reduced.

In the artificial dialysis device 63 thus constructed, when the patient m is subjected to artificial dialysis treatment, it is necessary to replace the tube with a new one due to deterioration of the tube and life of the tube. In addition, when there is a restriction on the device layout such as the bed position, or due to the inconvenience caused by the frequent puncture of the shunt needle on the same arm, the tube withdrawal direction may be changed from the left arm of the patient m to the right arm or vice versa. Need to change.

In such a case, the direction of pulling out the tube can be easily changed by exactly the same procedure as described in the item (3) of the above embodiment.

[0062]

The invention of claim 1 is different from the conventional pump which requires a great deal of time and labor for the operation of the conventional pump, and the opening / closing operation of the tube retainer, the tube hooking operation to the casing notch, and the rotor. Also, the elastic tube can be easily attached to and detached from the elastic tube mounting space of the casing by simply pressing the stouch button and giving a signal to the controller with little manual work such as reversing the casing and casing. It is also possible to change the pull-out direction of.

Therefore, even when it becomes necessary to replace the tube due to deterioration, the end of its life, or the like, it is possible to promptly respond regardless of the type of the tube.

According to the second aspect of the present invention, there is no risk of foreign matter entering the inside of the tube and the same effects as described above can be obtained, so that the present invention can be suitably used as a blood pump. According to the invention of claim 3, since the artificial dialyzer is constructed by using the above blood pump, the casing and the rotor are inverted regardless of the type of the elastic tube on either side of the left and right arms of the patient. By changing the tube retainer, the drawing direction can be easily changed.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of a tube pull-out direction variable pump according to the present invention.

FIG. 2 is a cross-sectional view taken along the line XX of the device of FIG. 1 excluding the rotor.

FIG. 3 is a sectional view of the rotor of the apparatus of FIG. 1 taken along arrow XX.

FIG. 4 is a plan view of the rotor of FIG.

5 is a plan view of the rotor of FIG. 3 with the disk removed.

FIG. 6 is a right side view of the rotor of FIG.

FIG. 7 is an explanatory view of the operation of mounting the elastic tube on the apparatus of FIG.

FIG. 8 is an operation explanatory view of mounting the elastic tube on the apparatus of FIG.

9 is an operation explanatory view of mounting an elastic tube on the apparatus of FIG.

10 is an operation explanatory view of mounting an elastic tube on the apparatus of FIG.

11 is an explanatory view of the operation of removing the elastic tube from the device of FIG.

FIG. 12 is an explanatory view of the operation of removing the elastic tube from the device of FIG.

13 is an explanatory view of the operation of removing the elastic tube from the device of FIG.

FIG. 14 is a perspective view of a tube withdrawal direction variable blood pump according to the present invention, and an overall schematic diagram of an artificial dialysis device using this blood pump.

FIG. 15 is a schematic plan view of a conventional tube pull-out direction variable pump.

[Explanation of symbols]

 1: Casing 2: Recessed portion 2a: Arc-shaped inner peripheral surface 3: Elastic tube 6a, 6b: Roller 20: Tube extraction direction variable pump 20a: Tube extraction direction variable blood pump 27: Motor 30: Drive shaft 34: Rotor 47: Magnetic Detection sensor (initial position detection means) 48: Magnet (initial position detection means) 49: Notch 51a: Suction side groove (inlet groove) 51b: Discharge side groove (outlet groove) 53: Tube holder 60: Controller 61: Timer (end position) Detection means) 63: Artificial dialysis device

Claims (3)

[Claims] 1. A casing having a recess having a substantially arcuate inner peripheral surface, an inlet groove and an outlet groove connected to the recess, and a motor having a drive shaft protruding from the center of the arcuate inner peripheral surface. Arranged along the inner peripheral surface of the casing and the both grooves,
Further, the casing and the rotor are provided with an elastic tube having both ends pulled out to the outside, and a rotor having a plurality of rollers for pressing the elastic tube and being detachably fixed to the drive shaft of the motor. A tube pull-out direction variable pump that changes the pull-out direction of the elastic tube by reversing, (a) between the rollers of the plurality of rollers and on the outer peripheral portion of the rotor along the circumferential direction. (B) a tube retainer that fixes the suction side end of the elastic tube to the inlet groove of the casing, and (c) the notched portion of the rotor serves as the inlet groove of the casing. Initial position detecting means for detecting that the rotor has moved to the opposing position, and (d) that the notch of the rotor has moved to a position facing the outlet groove of the casing. Variable tube pull-out direction, comprising: an end position detecting means for detecting; and (e) a controller for controlling the rotation angle of the motor between the initial position detecting means and the end position detecting means. pump. 2. A tube withdrawal direction variable blood pump, wherein the tube withdrawal direction variable pump according to claim 1 is used for feeding blood. 3. An artificial dialysis apparatus, wherein the tube withdrawal direction variable blood pump according to claim 2 is used for feeding blood.