JP2003113782A - Roller pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roller pump that can reduce labors and time for adjusting occlusion by automatically controlling adjustment of occlusion. SOLUTION: In this roller pump 11, a tube 17 is positioned between a peripheral wall 12 and a roller 14, and a rotor 13 is rotated together with the roller to fluidize fluid in the tube. A motor 18 for moving a roller is installed to a roller position variable mechanism 15. This roller pump is also provided with a pressure close control mechanism 19, which detects current flowing in the motor 16, compares the detected current value with a preset current value, drives a driving source for moving the roller when the detected value and the present value are different, and moves the roller to a proper position approaching to or separated from an axial line of rotation, so as to control the detected current value to be equal to the preset current value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an artificial heart-lung machine or the like used for gas exchange processing and redelivering blood removed from a patient in a heart disease operation or the like, and a roller used for artificial dialysis. The present invention relates to a pump, and more particularly to a roller pump capable of automatically controlling the degree of pressure closure.

[0002]

2. Description of the Related Art In general, as a pump used in an artificial heart-lung machine for carrying out gas exchange treatment while introducing blood to the outside of the body, a roller pump for squeezing a tube with a roller to deliver blood is often used. Conventionally, this type of roller pump generally has a structure as shown in FIG. In FIG. 2, reference numeral 1 is a roller pump, and the roller pump 1 includes a rotating body 3 rotatably supported in a peripheral wall 2 with a first rotation axis, and an outer end side of a rotation locus of the rotating body 3. A roller 4 rotatably supported by a second rotation axis parallel to the first rotation axis and capable of approaching and separating from the first rotation axis, and the first rotation axis direction of the rotating body 3. When the occlusion (compression degree) adjusting knob (operating member) 5 rotatably attached to the rotating body 3 about the first rotation axis on one end side of the rotating body and the occlusion adjusting knob 5 are rotated. And a roller position changing mechanism 6 for moving the roller 4 in the approaching / separating direction. This roller pump 1 includes a roller 4 and an inner surface of the peripheral wall 2.
Position the tube 7 in a substantially U-shape between the
Is rotated together with the roller 4 to feed the blood in the tube 7.

In the above-mentioned conventional roller pump, prior to its use, the tightening degree (compression degree) when the roller squeezes the tube is manually adjusted based on the water column pressure.
So-called occlusion adjustment must be performed.
In this occlusion adjustment, first, the occlusion adjustment knob is rotated to adjust the tightness of the tube, and after the adjustment, the adjustment knob is locked by the lock lever to prevent fluctuations in the occlusion adjustment during pump operation.

[0004]

However, in the conventional roller pump described above, the occlusion adjustment has to be performed manually, and the occlusion adjustment requires a certain amount of skill and knowledge, and is considerably large. There is a problem that labor and time are required, and that in the operation performed using several roller pumps, a lot of labor and time are required for the roller pump preparation work.

The present invention has been made in view of the above circumstances, and by automatically controlling occlusion adjustment,
The objective is to provide a roller pump that can reduce the time and effort for adjusting occlusion.

[0006]

In order to achieve the above-mentioned object, the present invention provides a casing, a rotating body rotatably supported in the casing with a first rotation axis, and a rotation locus of the rotating body. A roller that is rotatably supported on the outer end side of the first rotation axis by a second rotation axis that is parallel to the first rotation axis, and that is supported by the first rotation axis so that the roller can approach and separate from the first rotation axis; A roller position changing mechanism for moving the roller in a direction to rotate the motor, and a motor connected to the rotating body. A tube is positioned between the casing and the roller, and the rotating body is rotated together with the roller. In a roller pump that causes fluid in a tube to flow, a roller movement drive source is provided in the roller position changing mechanism, and a current flowing through the motor is detected to detect the current. The current value is compared with a preset current value, and if they are different, the roller moving drive source is driven to move the roller toward or away from the rotation axis to move to an appropriate position. Thus, there is provided a roller pump characterized by being provided with a pressure closing control mechanism for controlling the detected current value to be equal to the set current value.

In the roller pump according to the present invention, the roller moving drive source is an electric drive motor, and a slip ring is provided in contact with the rotating body, and electric power for driving the electric drive motor via the slip ring. May be supplied. Further, the roller position changing mechanism includes a rotating shaft rotated by the roller moving drive source, a moving member fitted so as to be movable on the rotating shaft according to the rotation of the rotating shaft, and the moving member. It may be configured to include a holding member which is in contact with a part of the roller and which holds the roller on the outside, and which approaches or separates from the rotation shaft according to the position of the moving member on the rotation shaft. Furthermore, while further including a temperature sensor for measuring the temperature of the tube, the pressure-closure control mechanism inputs the temperature data measured by the temperature sensor and obtains it by comparing it with preset temperature correction data. The roller moving drive source may be driven according to the correction value thus obtained.

[0008]

1 is a diagram showing an embodiment of a roller pump according to the present invention. This roller pump 1
Reference numeral 1 denotes a peripheral wall 12, a rotating body 13 rotatably supported in the peripheral wall 12 with a first rotation axis, and the rotating body 13
The second end parallel to the first rotation axis on the outer end side of the rotation locus of
Roller 14 supported so as to be rotatable about the first rotation axis and movable toward and away from the first rotation axis; a roller position changing mechanism 15 for moving the roller 14 in the direction toward and away from the first rotation axis; The motor 16 connected to the body is provided as a main element, and the tube 17 is positioned between the peripheral wall 12 and the roller 14 so that the rotor 13
Is rotated together with the roller 14, the fluid in the tube 17 is made to flow.

Further, the roller pump 11 is provided with a roller movement motor (roller movement drive source) 18 in the roller position changing mechanism 15, and the current flowing through the motor 16 is detected by a current measuring section 24. The current value is compared with a preset current value, and when they are different from each other, the roller moving drive source 18 is driven to move the roller 14 toward or away from the rotation axis to bring it to a proper position. A pressure closing control mechanism 1 for controlling the detected current value to be equal to the set current value by moving the same.
9 is provided.

In this example, the roller position changing mechanism 1
Reference numeral 5 denotes a roller moving motor 18, a rotary shaft 20 rotatably connected to the roller moving motor 18, and a rotary shaft 20 extending in the vertical direction, and a rotary shaft 20 movably fitted on the rotary shaft 20 as the rotary shaft 20 rotates. A pair of upper and lower moving members 21 attached
And a holding member 22 which is in contact with the moving member 21 and holds the roller 14 on the outside, and which approaches or separates from the rotating shaft 20 according to the position of the moving member 21 on the rotating shaft 20. It is configured with.

As the roller moving motor 18,
It suffices that the rotary shaft 20 can be rotated in either forward or reverse direction by being driven by the drive current sent from the press-close control unit 25 of the press-close control mechanism 19, which will be described later. Is used. A screw is formed on the surface of the rotary shaft 20 connected to the roller moving motor 18. In the present example, the screw of the rotary shaft 20 is formed with a reverse screw at the upper part and the lower part of the roller moving motor 18 as a boundary.

The moving member 21 has a trapezoidal shape and is composed of two members each having a screw hole formed in the center thereof for screwing a screw formed on the rotary shaft 20.
Are screw-fitted to the upper and lower portions of the rotary shaft 20 with their constricted surfaces facing each other. These moving members 21 move on the rotating shaft 20 in a direction in which they approach each other or in a direction in which they separate from each other by either forward or reverse rotation of the rotating shaft 20.

The holding member 22 has a roller 14 on the outside.
Is rotatably held, and has a structure in which a surface in contact with the inclined surface of the moving member 21 is provided inside. In this example, the holding member 22 surrounds a plurality of the members 22 around the moving member 21. It is arranged as follows. The plurality of holding members 22 are biased in the approaching direction (direction toward the rotating shaft 20) by the holding members 22 facing each other and a stretchable connecting member such as a spring 28. These holding members 22 move in a direction away from the rotary shaft 20 when the pair of moving members 21 move in a direction approaching each other on the rotary shaft 20, and the pair of moving members 21 move on the rotary shaft 20. When moving in a direction in which they move away from each other, they move in a direction in which they approach the rotating shaft 20.

The pressure closing control mechanism 19 includes a servo amplifier 23 capable of detecting the rotational driving state of the motor (servo motor) 16, a current detecting section 24 for detecting a current flowing through the motor 16, and a current detecting section 24. The detected current value detected by the above is compared with a preset current value, and when the two are different, the roller moving motor 18 is driven to move the roller 14 toward or away from the rotary shaft 20. The pressure closing control unit 25 controls the detected current value to be equal to the set current value by moving it to the proper position. As the pressure closing control unit 25, a well-known control device and control system such as a microcomputer capable of the above control can be used.

In this example, a slip ring 26 is used in order to pass a drive current from the pressure-closing control section 25 to the roller moving motor 18. That is, the motor 16
The slip ring 26 is placed on the upper surface of the roller, the rotating body 13 is placed on the upper surface of the slip ring 26 in a contact state, and a drive current is sent from the pressure closing control unit 25 to the roller moving motor 18 via the slip ring 26. It is possible to control the drive / stop of the roller moving motor 18 in the forward / reverse directions. The method for controlling the drive of the roller moving motor 18 by the press-close control unit 25 is not limited to this example, and another connection method or wireless control may be adopted.

On the upper end of the rotary shaft 20, there is provided an auxiliary pressure-closing adjustment knob 29 capable of controlling the pressure-closing degree of the roller 14 by manual operation. The press-close adjustment knob 29 is for manually rotating the rotary shaft 20 in the forward and reverse directions to adjust the approach / separation of the roller 14 with respect to the rotary shaft 20. The press-close adjustment knob 29 can be omitted.

In a further preferred embodiment, for example, a temperature sensor 30 for measuring the temperature of the tube 17 is provided on the surface of the peripheral wall 12 in contact with the tube 17, and the temperature data measured by the temperature sensor 30 is used to close and close the controller 25. Is input to drive the roller moving motor 18 in accordance with a correction value obtained by comparison with preset temperature correction data. With such a configuration, the temperature error in which the physical properties of the fluid, particularly the viscosity, changes due to the temperature change of the fluid in the tube 17 and the amount of the fluid such as blood transported by the roller pump 11 deviates from the set value. Can be corrected, and an appropriate amount of fluid can be transported even when a temperature change occurs.

The roller pump 11 configured as described above
The procedure for adjusting the degree of closure (occlusion) by the procedure will be described. First, a clean tube 17 is arranged between the peripheral wall 12 of the roller pump 11 and the plurality of rollers 14. The tube 17 used here has various dimensions, materials,
It can be appropriately selected and used from various commercially available products of hardness. Then, both ends of the tube 17 are connected to a container containing an appropriate liquid such as water, physiological saline or blood so that the liquid can be supplied into the tube 17. Then, the motor 16 is driven. As the rotating body 13 rotates, the liquid flows in the tube 17 in a certain direction at a predetermined flow velocity by the plurality of rollers 14 that rotate and move with respect to the peripheral wall 12.

In this state, the current flowing through the motor 16 is detected by the current detecting section 24, and the detected current value detected here is input to the pressure closing control section 25. The pressure closing control unit 25 compares the detected current value with a preset current value. If they are different, the pressure closing control unit 2
A current for driving the roller moving motor 18 from 5 is supplied to the roller moving motor 18 via the slip ring 26. The roller moving motor 18 is driven by the current to rotate the rotating shaft 20 in either forward or reverse directions.

The rotation of the rotary shaft 20 causes the pair of moving members 21 to move on the rotary shaft 20 by a predetermined distance in a direction toward or away from each other. The holding member 22 holding the roller 14 by the movement of the moving member 21.
However, when the moving member 21 moves in the approaching direction, the moving member 21 moves a predetermined distance in the direction of separating from the rotating shaft 20, and when the moving member 21 moves in the separating direction, the moving member 21 approaches the rotating shaft 20. It moves in a predetermined direction in a predetermined interval. This holding member 2
By the movement of 2, the gap between the plurality of rollers 14 and the peripheral wall 12 is widened or narrowed, and the degree of pressure closure of the tube 17 is changed.

By properly adjusting the degree of pressure closure of the tube 17 automatically and repeatedly, a proper degree of pressure closure of the tube can be obtained. When the tube 17 to be actually used is attached and the preliminary degree of pressure closure is measured with a suitable liquid such as water, the degree of pressure closure can be stored in the device and used actually.

The roller pump of the present invention is not limited to the one embodiment described above, and various modifications can be made. For example, a piezoelectric actuator or a shape memory alloy can be used instead of the motor as the roller movement drive source. When a piezoelectric actuator is used, electric control similar to that of a motor is possible, and when a shape memory alloy is used, a roller position variable mechanism equipped with a heating source and a cooling source (which can be air cooling or water cooling) is used. Must be used.

[0023]

According to the present invention, it is possible to provide a roller pump capable of reducing the trouble and time for occlusion adjustment by automatically controlling the occlusion adjustment.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a roller pump of the present invention.

FIG. 2 is a schematic configuration diagram of a conventional roller pump.

[Explanation of symbols]

11 roller pump 12 surrounding walls 13 rotating body 14 roller 15 Roller position variable mechanism 16 motor 17 tubes 18 Roller movement motor (roller movement drive source) 19 Pressure closure control mechanism 20 rotation axis 21 Moving member 22 Holding member 23 Servo amplifier 24 Current detector 25 Pressure closing control unit 30 temperature sensor

Claims (4)

[Claims] 1. A casing, a rotating body rotatably supported in the casing with a first rotation axis, and a second parallel to the first rotation axis on an outer end side of a rotation locus of the rotation body. Connected to the rotating body, a roller supported so as to be rotatable with respect to the first rotation axis and capable of approaching and separating from the first rotation axis, a roller position changing mechanism for moving the roller in the approaching and separating directions, In the roller pump, the tube is positioned between the casing and the roller, and the fluid in the tube is caused to flow by rotating the rotating body together with the roller. A roller moving drive source is provided, and the current flowing through the motor is detected, and the detected current value is compared with a preset current value, If the person is different, the roller moving drive source is driven to move the roller toward or away from the rotation axis to move it to an appropriate position so that the detected current value becomes equal to the set current value. A roller pump characterized by being provided with a pressure closing control mechanism for 2. The roller moving drive source is an electric drive motor, a slip ring is provided in contact with the rotating body, and electric power for driving the electric drive motor is supplied through the slip ring. The roller pump described in. 3. The roller position changing mechanism includes a rotating shaft rotated by the roller moving drive source, a moving member fitted movably on the rotating shaft according to the rotation of the rotating shaft, 3. A holding member, which is in contact with a part of a moving member and holds the roller on the outside, and which holds or moves away from the rotating shaft according to the position of the moving member on the rotating shaft. Roller pump. 4. A temperature sensor for measuring the temperature of the tube is further provided, and the pressure closing control mechanism inputs temperature data measured by the temperature sensor and compares the temperature data with preset temperature correction data. The roller pump according to any one of claims 1 to 3, wherein the roller moving drive source is driven according to the correction value obtained by the above.