JPH08170590A - Tube pump - Google Patents

Abstract

PURPOSE: To obtain a tube pump, by which the size can be easily. reduced while the flow rate is secured. CONSTITUTION: A tube 12 is passed through the inner surface of a door member 4 fitted to a case main body 2 in such a manner as to be freely opened and closed, and the tube is pressed at three parts along the longitudinal direction by a pressing means. The pressing means comprises an intake side pressing member, an intermediate pressing member and a discharge side pressing member which respectively include plate springs 14a, 14b, 14c attached to the inner surface of the door member 4, and peripheral surface cam members 16a, 16b, 16c which are supported on a rotary shaft 18 to press the tube 12 to the plate springs and release pressing and installed on the case main body 2. The rotary shaft 18 is rotated by a motor 20 and a speed reducer 22 to sequentially execute pressing of the pressing members from the intake side pressing member to the discharge side pressing member according to the arrangement and further sequentially execute releasing of pressing of the pressing members. Thus, the pressing of all the pressing members are not simultaneously released.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tube pump, and more particularly to a tube pump which can secure a flow rate and can be easily miniaturized. INDUSTRIAL APPLICABILITY The tube pump of the present invention can be applied to intravenous drug injection in the medical field, for example.

[0002]

2. Description of the Related Art Conventionally, the problems to be solved by the invention
BACKGROUND ART Infusion is used as a technique for continuous infusion of liquid medicine into a human body vein. In the infusion, the drug solution is placed higher than the human body,
This is done by injecting a drug solution into a vein under pressure based on gravity through a tube and a needle that is connected to the tip of the tube and is inserted into the blood vessel.

However, this may result in an insufficient injection rate. Also, when the patient receiving the infusion moves, the instilled drug solution must be carried along with the support,
There is an inconvenience that the degree of freedom of the patient is limited. Therefore, it has been desired to develop a small and excellent drug solution injecting means that can be easily worn and moved by a patient.

It is conceivable to use a pump for the above-mentioned chemical injection.

By the way, a tube pump is used as a pump having a simple operation mechanism. A conventional tube pump has a plurality of rollers arranged along a length direction of an elastic tube and sequentially rolls in a specific direction over a predetermined distance in a state where the rollers are pressed against the tube so that two adjacent rollers are provided. The pump action is realized by moving from the suction side to the discharge side for each liquid between the tube portions that are pressed and blocked by.

However, in the conventional tube pump, the rolling shaft of each rolling roller is held at the tip of the arm, the base of the arm is attached to a common rotary shaft, and the rotary shaft is rotated to cause the pump to move. Since it operates, there is a drawback that it is difficult to reduce the size.

[0007] Therefore, an object of the present invention is to provide a tube pump which can easily be miniaturized while securing a flow rate.

[0008]

According to the present invention, in order to achieve the above object, a tube and the tube are pressed in a direction substantially orthogonal to the tube by at least three portions along the length direction thereof. Pressing means for operating the suction side pressing member, the discharging side pressing member, and at least one intermediate pressing member positioned between the suction side pressing member and the discharging side pressing member. Pressing the pressing members sequentially according to the arrangement from the pressing members to the discharge side pressing members, and further sequentially releasing the pressing of the pressing members, but pressing so as not to release all the pressing members at the same time A tube pump, characterized in that it is provided with control means.

In one aspect of the present invention, the suction side pressing member, the discharge side pressing member and the intermediate pressing member are
Each of them has a leaf spring and a circumferential cam member which rotates about an axis substantially parallel to the tube so as to press and release the tube against the leaf spring.

In one aspect of the present invention, the suction side pressing member, the discharge side pressing member and the intermediate pressing member are
In any case, a pressing action piston that is held so as to reciprocate so as to press and release the tube, a biasing means that biases the pressing action piston in a direction to release the pressing of the tube, and the pressing action. And a peripheral cam member that rotates about an axis substantially parallel to the tube so as to press and release the tube against the piston.

In one aspect of the present invention, the pressing control means includes the peripheral surface cam member of the suction side pressing member, the peripheral surface cam member of the discharge side pressing member, and the peripheral surface cam member of the intermediate pressing member in common. The rotation shaft is supported by the rotation shaft, and the rotation shaft is driven by the rotation driving means.

[0012] In one aspect of the present invention, an Oldham coupling is interposed between the rotary drive means and the common rotary shaft.

In one aspect of the present invention, the tube, the pressing means, and the pressing control means are housed in a case.

In one aspect of the present invention, the tube, the pressing means, and the pressing control means are housed in a case, and the case is a case body and a door attached to the case body so as to be openable and closable. A member, the leaf spring is attached to the inner surface of the door member, and the peripheral cam member is attached to the case body.

In one aspect of the present invention, locking means for locking the tube at a predetermined position pressed by the pressing means is attached to the inner surface of the door member.

In one aspect of the present invention, the locking means is a groove.

In one aspect of the present invention, the suction side pressing member, the discharge side pressing member and the intermediate pressing member are:
Each of them comprises a pressing action portion capable of reciprocating so as to press and release the tube, and a reciprocating movement driving means for driving the reciprocating movement of the pressing action portion.

In one aspect of the present invention, the reciprocating drive means is an electromagnetic actuator.

In one aspect of the present invention, the pressing control means includes a control circuit for controlling the operation of the electromagnetic actuator of each pressing member.

In one aspect of the present invention, locking means for locking the tube at a predetermined position pressed by the pressing means is provided.

In one aspect of the present invention, the tube is arranged such that the tube can be removed from a predetermined position where the pressing means presses the tube.

Further, according to the present invention, there is provided a tube pump drive device, characterized in that the tube of the tube pump is removed from the predetermined position.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first tube pump according to the present invention.
2 is an exploded perspective view showing the embodiment of FIG. 2 and FIG. 3 is a sectional view thereof. However, these figures show different operating states.

In these drawings, 2 is a case body, and a door member 4 is rotatably attached to the case body 2 by a hinge 6. A locking member 8 for locking the door member 4 to the case body 2 in a closed state is attached to the door member 4. The locking member 8 has elasticity and can engage and disengage the recess 10 formed on the side surface of the case body 2. A case is configured to include the case body 2 and the door member 4.

Reference numeral 12 is a tube having elasticity, and the tube 12 is, for example, a tube for injecting a drug solution into a vein. A fluid such as a drug solution is moved in the tube 12 in the direction of the arrow, that is, 12a is the suction side and 12b is the discharge side. The tube 12 is the door member 4
It is arranged via the leaf springs 14a, 14b, 14c which are fixed to. These leaf springs are composed of a common spring plate having a V-shaped cross section, and one part of the V-shaped cross section of the spring plate is screwed to the inner surface of the door member 4. The other part of the spring plate is the above-mentioned plate spring 14
a, 14b, 14c are formed. The spring plate portion on the side attached to the inner surface of the door member 4 forms tube locking means 15a, 15b that can be partially upright. As shown in the figure, the tube 12 is arranged in a state where it is locked by locking means between two parts of the V-shaped cross section of the spring plate and its movement is restricted.

On the other hand, in the case, the leaf springs 14a,
14b, 14c at a position corresponding to the circumferential cam member 16a,
16b and 16c are mounted and arranged on a common rotary shaft 18. The rotary shaft 18 is arranged parallel to the longitudinal direction of the tube 12 on the door member 4. Case body 2
A motor 20 and a speed reducer 22 attached to the motor
Is arranged, and the output rotary shaft 24 of the speed reducer 22 is connected to the rotary shaft 18, whereby the peripheral surface cam members 16a, 16b, 16c are driven. Two
Reference numerals 6 and 28 denote end face plates attached to both ends of the case body 2, and these also constitute the case. Both ends of the rotary shaft 18 are attached to the case via bearings.

The leaf spring 14a and the peripheral cam member 16 are provided.
a is a suction side pressing member, and the leaf spring 14b and the peripheral cam member 16b are intermediate pressure members. The leaf spring 14c and the peripheral cam member 16c are included. The discharge side pressing member is configured to include and.

In FIG. 3, a state in which the door member 4 is opened is shown by an imaginary line. The door member 4 is positioned substantially vertically, and in this state, the tubes 12 are removed from between the leaf spring and the tube locking means 15a, 15b by operating the leaf springs 14a, 14b, 14c with fingers. be able to. Similarly, the tube 12 can be attached to the predetermined position shown.

FIG. 4 shows the peripheral cam members 16a, 16b,
16C is a schematic view showing the shape of 16c and various operating states thereof, and FIG. 5 is a schematic view showing the deformed state of the tube 12 in various operating states of the peripheral surface cam members 16a, 16b, 16c. In these drawings, the leaf springs 14a, 14b and 14c are omitted for simplification. 4 (a) to (e) are shown in FIG. 5 (a) to (e), respectively.
It corresponds to (e), and in these figures, the state where the rotary shaft 18 is gradually rotated by 72 degrees from (a) to (e) is shown.

In FIGS. 4 and 5 (a), the large diameter portion of the cam 16a presses the tube 12 via the leaf spring 14a, and the large diameter portion of the cam 16b presses the tube 12 via the leaf spring 14b. Is being pressed, and the small diameter portion of the cam 16c is in contact with the leaf spring 14c. Thereby, the tube is pressed by the suction side pressing member and the intermediate pressing member, and the tube pressing is released by the discharge side pressing member.

In FIG. 4 and FIG. 5B, the large diameter portion of the cam 16a presses the tube 12 via the leaf spring 14a, and the large diameter portion of the cam 16b passes through the leaf spring 14b to the tube 12. And the large diameter portion of the cam 16c presses the tube 12 via the leaf spring 14c. As a result, the tube is pressed by the suction side pressing member, the intermediate pressing member and the discharge side pressing member. Therefore, (a)
When the state is changed to the state of (b), the fluid existing in the tube portion below the discharge side pressing member is discharged to the discharge side.

In FIGS. 4 and 5C, the small diameter portion of the cam 16a is in contact with the leaf spring 14a, the small diameter portion of the cam 16b is in contact with the leaf spring 14b, and the large diameter portion of the cam 16c is shown. Presses the tube 12 via the leaf spring 14c. As a result, the tube is pressed by the discharge side pressing member, and the tube is released by the suction side pressing member and the intermediate pressing member. Therefore, when transitioning from the state of (b) to the state of (c), the fluid on the suction side is sucked into the tube portion below the suction side pressing member and the intermediate pressing member. When the state of (b) is changed to the state of (c), the tube pressing by the suction side pressing member is first released, and then the tube pressing by the intermediate pressing member is released. But it's okay.

In FIGS. 4 and 5D, the large diameter portion of the cam 16a presses the tube 12 via the leaf spring 14a, and the small diameter portion of the cam 16b abuts the leaf spring 14b. The large diameter portion of the cam 16c presses the tube 12 via the leaf spring 14c. Thereby, the tube is pressed by the suction side pressing member and the discharge side pressing member, and the tube pressing is released by the intermediate pressing member.

In FIG. 4 and FIG. 5 (e), the large diameter portion of the cam 16a presses the tube 12 via the leaf spring 14a, and the large diameter portion of the cam 16b presses the tube 12 via the leaf spring 14b. Is being pressed, and the small diameter portion of the cam 16c is in contact with the leaf spring 14c. Thereby, the tube is pressed by the suction side pressing member and the intermediate pressing member, and the tube pressing is released by the discharge side pressing member. Therefore, when shifting from the state of (d) to the state of (e),
The fluid in the tube portion below the intermediate pressing member is moving into the tube portion below the discharge-side pressing member. still,
When shifting from the state of (d) to the state of (e), the tube pressure is first released by the discharge side pressing member and then the intermediate pressing member is pressed, but these may be performed simultaneously.

Thereafter, by repeating the same process,
The pump action is realized.

According to the above embodiment, the tube 12
The peripheral surface cam members 16a to 16c attached to the rotary shaft 18 arranged along a predetermined distance are rotated, and the tube member 12 is sequentially pressed and released by the cam members, and the suction side pressing member and the intermediate pressing member. The fluid is sucked from the suction side by releasing the pressure by the suction side, the suction side is blocked by the suction side pressing member, the pressure by the discharge side pressing member is released, and the fluid is discharged by pressing the intermediate pressing member and the discharge side pressing member. It can be discharged to the discharge side.

According to this structure, the diameter of the cam members can be reduced while maintaining the distance between the adjacent cam members (that is, while maintaining the discharge amount). The cam member only needs to have a minimum difference in diameter between the large diameter portion and the small diameter portion by the outer diameter of the tube. When the outer diameter of the tube is small, the diameter of the cam member can be made sufficiently small. Therefore, it is easy to downsize the device while maintaining the flow rate.

Further, in this embodiment, the cam members 16a-1a are provided.
Since 6c presses the tube via the leaf springs 14a to 14c, the tube is not adversely affected by the circumferential cam sliding due to the rotation of the cam member. That is, since the pressing force is always applied to the tube in a direction substantially orthogonal to the length direction, fatigue deterioration of the tube is small.

FIG. 6 shows a second embodiment of the tube pump according to the present invention.
FIG. 7 is a partial sectional view showing the embodiment of FIG. In these figures, members having the same functions as those in FIGS. 1 to 5 are designated by the same reference numerals.

In this embodiment, the frame 30 is provided with the table 32, and the tube 12 is used as the table 3.
It is located on the 2nd. Electromagnetic actuators 34a, 34b, 34c are arranged below the table 32 along the path from the suction side to the discharge side of the tube. Each of these actuators has a pressing action portion 36a, 36b, 3 extending above the table 32.
6c is attached. These pressing action parts are reciprocally moved in the vertical direction by an actuator, and when placed in the upper position, the pressing of the tube 12 is released,
When placed in the lower position, the tube 12 is pressed.
As shown in FIG. 7, the tube 30 is attached to the frame 30.
Locking means 38 for locking 2 at a predetermined pressing position is attached by a pin so as to be rotatable around it.
With the locking means 38 rotated to the position shown by the phantom line in FIG. 6, the tube 12 can be arranged in the predetermined position or taken out from the predetermined position.

FIG. 8 is a schematic block diagram showing the drive system of this embodiment. The control circuit 40 controls the electromagnetic actuator 3
The drive of 4a to 34c is controlled.

FIG. 9 is a time chart for explaining the operation of driving the electromagnetic actuator by the control circuit 40. First, all the electromagnetic actuators 34a, 34b,
34c is ON (the pressing action portion is in the lower position, that is, the tube 12 is pressed), and at time t1, the electromagnetic actuator 34a is OFF (the pressing action portion is in the upper position, that is, the tube 12 is not pressed). Has been released), and at time t2, the electromagnetic actuator 34
b is turned off, the electromagnetic actuator 34a is turned on at time t3, the electromagnetic actuator 34c is turned off at time t4, the electromagnetic actuator 34b is turned on at time t5, the electromagnetic actuator 34c is turned on at time t6, and the electromagnetic actuator 34c is turned on at time t7. 34a is turned off, the electromagnetic actuator 34b is turned off at time t8, the electromagnetic actuator 34a is turned on at time t9, the electromagnetic actuator 34c is turned off at time t10, the electromagnetic actuator 34b is turned on at time t11, and the time t12.
At, the electromagnetic actuator 34c is turned on, and the same is performed thereafter.

Also in this embodiment, the same function as that of the first embodiment is realized.

FIG. 10 is a perspective view showing a third embodiment of the tube pump according to the present invention, FIG. 11 is a partially exploded perspective view thereof, and FIGS. 12, 13 and 14 show an assembled state of this embodiment. FIG. In these figures, members having the same functions as those in FIGS. 1 to 9 are designated by the same reference numerals.

In the present embodiment, the case body 2 is provided with pressing pistons 44a, 44 so as to be reciprocally movable in the vertical direction.
b and 44c are held. These pressing pistons are compression coil springs 46a and 46, which are biasing means, respectively.
It is biased upward by b and 46c. The upper end surfaces of the pressing pistons 44a, 44b, 44c are brought into contact with the peripheral surface cam members 16a, 16b, 16c, respectively, and the compression coil springs 46 are made by these peripheral surface cam members.
The lower end surfaces of the pressing action pistons 44a, 44b, 44c are adapted to press the tube 12 downward against the biasing forces of a, 46b, 46c.

Further, in this embodiment, the output shaft 2 of the speed reducer is used.
An Oldham coupling 48 is interposed between the No. 4 and the rotary shaft 18. Further, in this embodiment, the inner surface of the door member 4 is formed with a groove 50 as a locking means for locking the tube 12 at a predetermined position. Reference numeral 51 is a power supply line for the motor 20.

FIG. 13 shows the door member 4 closed, and FIG. 14 shows the door member 4 opened. In the state shown in FIG. 14, the tube 12 can be attached to and detached from the groove 50.

Also in this embodiment, the same function as in the first embodiment is realized.

FIG. 15 shows an outline of an intravenous drug injection device using the tube pump of this embodiment.
In the figure, reference numeral 52 is a tube pump, and the tube suction side portion 12a is connected to a drug solution storage bag 54,
The tube discharge side portion 12b is connected to the injection needle 56. Reference numeral 58 is a power supply unit for the motor 20, which is 100V
The AC power is converted into 6V DC (corresponding to the standard motor speed) to drive the motor 20. Reference numeral 60 is a power switch, and 62 is a knob for adjusting the motor rotation speed by changing the voltage supplied to the motor 20,
64 is a timer. Instead of the power supply unit 58, for example, a 6V storage battery 59 can be used.

In the above embodiments, one intermediate pressing member is used, but a plurality of intermediate pressing members can be used. Also in this case, the pump action can be similarly realized by pressing and releasing the pressing members in the order of arrangement. In this case, by appropriately setting the driving timing of the pressing member, it is possible to perform the transfer for each fluid between the tube portions that are blocked by the alternate pressing member as in the above embodiment, or two or more. It is also possible to perform transfer for each fluid between the tube portions that are pressed and blocked by every other pressing member.

Needless to say, the present invention can be used not only for injecting the above-mentioned intravenous drug solution but also for other purposes.

Further, according to the present invention, the tube 12 is arranged so that the tube 12 can be detached from a predetermined pressing position as in the above embodiment, and the tube 12 is detached from the predetermined position. A device is also provided. According to this, a pump action can be easily added to an appropriate fluid circulation tube.

[0054]

As described above, according to the present invention, there is provided a tube pump and a driving device for the tube pump, which can secure a flow rate and can be easily downsized.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a first embodiment of a tube pump according to the present invention.

FIG. 2 is a sectional view of a first embodiment of the tube pump according to the present invention.

FIG. 3 is a sectional view of a first embodiment of the tube pump according to the present invention.

FIG. 4 is a schematic view showing the shape of a peripheral cam member and various operating states thereof.

FIG. 5 is a schematic view showing a deformed state of the tube in various operating states of the peripheral surface cam member.

FIG. 6 is a partial sectional view showing a second embodiment of the tube pump according to the present invention.

FIG. 7 is a sectional view of a second embodiment of the tube pump according to the present invention.

FIG. 8 is a schematic block diagram showing a drive system of a second embodiment of the tube pump according to the present invention.

FIG. 9 is a time chart for explaining the operation of driving the electromagnetic actuator by the drive circuit of the second embodiment of the tube pump according to the present invention.

FIG. 10 is a perspective view showing a third embodiment of the tube pump according to the present invention.

FIG. 11 is a partially exploded perspective view of the third embodiment of the tube pump according to the present invention.

FIG. 12 is a sectional view of a tube pump according to a third embodiment of the present invention in an assembled state.

FIG. 13 is a sectional view of a tube pump according to a third embodiment of the present invention in an assembled state.

FIG. 14 is a sectional view of a tube pump according to a third embodiment of the present invention in an assembled state.

FIG. 15 is a schematic view showing an intravenous drug injection device using a tube pump according to a third embodiment of the present invention.

[Explanation of symbols]

 2 Case Main Body 4 Door Member 6 Hinge 8 Locking Tool 10 Recess 12 Tube 12a Suction Side 12b Discharge Side 14a, 14b, 14c Leaf Springs 15a, 15b Tube Locking Means 16a, 16b, 16c Circumferential Cam Member 18 Rotating Shaft 20 Motor 22 reducer 24 reducer output rotary shaft 26, 28 end face plate 30 frame 32 table 34a, 34b, 34c electromagnetic actuator 36a, 36b, 36c pressing action part 38 locking means 40 control circuit 44a, 44b, 44c pressing action piston 46a, 46b, 46c Compression coil spring 48 Oldham coupling 50 Groove 51 Power supply line 52 Tube pump 54 Chemical solution storage bag 56 Injecting needle 58 Power supply unit 59 Storage battery 60 Power switch 62 Motor speed adjustment knob 64 Timer

Claims (15)

[Claims] 1. A tube, and a pressing means for pressing the tube in a direction substantially orthogonal to the tube at least at three portions along the length direction thereof, the pressing means comprising a suction side pressing member and a discharge side. Side pressing member and at least one intermediate pressing member located between the suction side pressing member and the discharge side pressing member, and the pressing member presses the suction side pressing member to the discharge side pressing member according to the arrangement thereof. The tube pump is characterized in that the tube pump is provided with a pressing control means for controlling so that the pressing members are sequentially released and the pressing members are not released at the same time. 2. The suction side pressing member, the discharge side pressing member and the intermediate pressing member are all substantially parallel to the plate spring and the tube so as to press and release the tube against the plate spring. The tube pump according to claim 1, further comprising: a peripheral cam member that rotates about another axis. 3. The suction-side pressing member, the discharge-side pressing member, and the intermediate pressing member are all pressing pistons that are reciprocally held so as to press and release the tube, and the pressing member. Urging means for urging the working piston in a direction for releasing the pressing of the tube, and a circumference for rotating about an axis substantially parallel to the tube so as to press and release the tube with respect to the pressing working piston. And a surface cam member.
The tube pump according to claim 1. 4. The pressing control means supports the peripheral cam member of the suction side pressing member, the peripheral cam member of the discharge side pressing member and the peripheral cam member of the intermediate pressing member by a common rotating shaft. The tube pump according to claim 2 or 3, wherein the rotary shaft is driven by a rotary drive means. 5. An Oldham coupling is interposed between the rotary drive means and the common rotary shaft,
The tube pump according to claim 4. 6. The tube pump according to claim 1, wherein the tube, the pressing unit, and the pressing control unit are housed in a case. 7. The tube, the pressing means, and the pressing control means are housed in a case, and the case has a case body and a door member attached to the case body so as to be openable and closable. The leaf spring is attached to an inner surface of the door member, and the peripheral cam member is attached to the case body.
The tube pump according to 4 or 5. 8. The locking means for locking the tube at a predetermined position pressed by the pressing means is attached to an inner surface of the door member.
The tube pump described in. 9. The tube pump according to claim 8, wherein the locking means is a groove. 10. The suction-side pressing member, the discharge-side pressing member, and the intermediate pressing member are all reciprocally movable pressing members for pressing and releasing the tube, and the pressing members. The tube pump according to claim 1, further comprising a reciprocating movement driving unit that drives reciprocating movement. 11. The tube pump according to claim 10, wherein the reciprocating drive means is an electromagnetic actuator. 12. The tube pump according to claim 11, wherein the pressing control means includes a control circuit for controlling the operation of the electromagnetic actuator of each pressing member. 13. A locking means for locking the tube at a predetermined position pressed by the pressing means, according to any one of claims 1 to 6, 10 and 12. The tube pump described in. 14. The tube is arranged so that the tube can be removed from a predetermined position where the pressing means presses the tube.
The tube pump according to any one of to 13. 15. A tube pump drive device comprising the tube pump of claim 14 with the tube removed from the predetermined position.