Fluid flow control device and extracorporeal circulation device

Abstract

To provide a fluid flow rate control device and an extracorporeal circulation device capable of quickly changing the flow rate value of a fluid in an emergency while preventing improper operation of a rotation-operation input unit.SOLUTION: A fluid flow rate control device 10 controls the flow rate value of a fluid, sent out from flow rate adjustment means P, via a rotation operation of a rotation operation input unit 6, such that the flow rate value of the fluid sent out from the flow rate adjustment means P is not changed when a rotation operation of a predetermined unit rotation amount of the rotation operation input unit 6 is continuously performed up to a preset first set rotation amount, and the flow rate value of the fluid sent out from the flow rate adjustment means P is changed according to the rotation amount in excess of the first set rotation amount when the rotation operation of the predetermined unit rotation amount of the rotation operation input unit 6 is continuously performed beyond the first set rotation amount.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a fluid flow rate control device and an extracorporeal circulation device. [Background technology]

[0002] Conventionally, an extracorporeal circulation device has been known that includes a blood circuit, a blood pump (flow rate adjusting means) provided in the blood circuit, and a dial-type rotary operation input unit that can adjust the flow rate of blood (fluid) pumped from the blood pump (see, for example, Patent Document 1). The extracorporeal circulation device of Patent Document 1 can change the flow rate of blood pumped from the blood pump when rotation operation using the rotary operation input unit is performed continuously for more than a predetermined time. As a result, even if a user's hand touches the rotary operation input unit and rotates it within the predetermined time, the flow rate of blood pumped from the blood pump does not change, thereby preventing erroneous operation of the rotary operation input unit. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4573019 Summary of the Invention [Problem to be solved by the invention]

[0004] In the extracorporeal circulation device of Patent Document 1, in an emergency, when it is desired to quickly reduce the flow rate of blood pumped from the blood pump, even if the rotary operation input unit is rotated quickly, the blood flow rate cannot be changed within a predetermined time, and therefore the blood flow rate cannot be reduced in a short time. Therefore, it is desired to be able to quickly change the flow rate of blood pumped from the blood pump in an emergency while preventing erroneous operation of the rotary operation input unit.

[0005] An object of the present invention is to provide a fluid flow rate control device and an extracorporeal circulation device that can change the flow rate value of a fluid in a short time in an emergency while preventing erroneous operation of a rotary operation input unit. [Means for solving the problem]

[0006] The present invention relates to a fluid flow control device that controls the flow rate value of a fluid discharged from a flow rate adjustment means by the rotation operation of a rotation operation input unit, and that controls so that when a rotation operation of a predetermined unit rotation amount on the rotation operation input unit is performed continuously up to a preset first set rotation amount, the flow rate value of the fluid discharged from the flow rate adjustment means is not changed, and when a rotation operation of the predetermined unit rotation amount on the rotation operation input unit is performed continuously beyond the first set rotation amount, the flow rate value of the fluid discharged from the flow rate adjustment means is changed in accordance with the rotation amount exceeding the first set rotation amount.

[0007] It is also preferable that the change in the flow rate value of the liquid delivered from the flow rate adjusting means be controlled in accordance with the direction of rotation of the rotation operation input portion.

[0008] It is also preferable that the end of the rotation operation of the rotation operation input unit is determined when there is no next rotation operation for a predetermined time after the end of the rotation operation of the rotation operation input unit.

[0009] Furthermore, when the rotation operation input unit is rotated continuously by a predetermined unit rotation amount of at least a second set rotation amount, which is larger than the first set rotation amount, within a preset time in a rotation direction that reduces the flow rate value of the fluid discharged from the flow rate adjustment means, it is preferable to control the flow rate value of the fluid discharged from the flow rate adjustment means to be reduced to a predetermined flow rate value.

[0010] Furthermore, it is preferable that when the rotation operation input unit is rotated continuously by a predetermined unit rotation amount of at least a third set rotation amount, which is larger than the first set rotation amount, within a preset time in a rotation direction that increases the flow rate value of the fluid discharged from the flow rate adjustment means, the flow rate value of the fluid discharged from the flow rate adjustment means is controlled to increase to a predetermined flow rate value.

[0011] The present invention also relates to an extracorporeal circulation device comprising a flow rate adjusting means, a rotary operation input unit that is mechanically rotatable and can be rotated to change the flow rate value of the fluid discharged from the flow rate adjusting means, and a fluid flow rate control device that controls the flow rate value of the fluid discharged from the flow rate adjusting means by rotating the rotary operation input unit. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide a fluid flow rate control device and an extracorporeal circulation device that can change the flow rate value of a fluid in a short time in an emergency while preventing erroneous operation of a rotary operation input unit. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a diagram showing a blood purification device according to an embodiment of the present invention. [Figure 2] FIG. 2 is a perspective view showing the console of the blood purification device. [Figure 3] 10A and 10B are diagrams illustrating a unit rotation amount of a rotation operation input unit. [Figure 4] FIG. 2 is a block diagram of a blood flow control device. [Figure 5] 10 is a timing chart showing a first example of erroneous operation prevention in the erroneous operation prevention control. [Figure 6] 10 is a timing chart showing a second example of erroneous operation prevention in the erroneous operation prevention control. [Figure 7] 10 is a timing chart showing blood flow rate change control in an emergency. [Figure 8] 10 is a timing chart showing blood flow rate change control in an emergency. [Figure 9] 10 is a timing chart showing control for greatly changing the flow rate value of the fluid. DETAILED DESCRIPTION OF THE INVENTION

[0014] A preferred embodiment of an extracorporeal circulation apparatus including a blood flow control device of the present invention will be described below with reference to the drawings. In this invention, a blood purification apparatus 1 capable of performing dialysis therapy will be described as an example of an extracorporeal circulation apparatus. The blood purification apparatus 1 described in this embodiment is an automatic blood purification apparatus that automatically and continuously performs each of the following steps by controlling the flow of dialysate within the blood circuit: a priming step for cleaning the components of the apparatus; a blood removal step for removing blood from the patient; a dialysis step for removing excess water from the blood; and a blood return step for returning the blood to the patient.

[0015] As shown in Fig. 1, the blood purification device 1 includes a hemodialyzer 2 such as a dialyzer or a hemodiafilter, an arterial blood line L1, a venous blood line L2, a dialysate inlet line L3, a dialysate outlet line L4, a console 3, and a dialysate drain line L5. The console 3 is equipped with an operation display unit 4, a portion of the arterial blood line L1, a blood pump P, and a blood flow control device 10. The arterial blood line L1 and the venous blood line L2 form a blood circuit. The arterial blood line L1, the venous blood line L2, the dialysate inlet line L3, the dialysate outlet line L4, and the dialysate drain line L5 are all mainly composed of flexible tubes through which a liquid can flow.

[0016] The hemodialyzer 2 is connected to an arterial blood line L1 and a venous blood line L2. Blood from the patient H is introduced into the hemodialyzer 2 by a blood pump P provided on the arterial blood line L1. The blood pump P is disposed on the console 3. A blood circuit is attached to the blood pump P.

[0017] A well-known centrifugal pump or roller pump is used as the blood pump P. In this embodiment, for example, a roller pump is used as the blood pump P, and the blood pump P pumps out blood from the arterial blood line L1 by squeezing the tube that constitutes the arterial blood line L1 with the roller pump. The hemodialyzer 2 is connected to the dialysate inlet line L3 and the dialysate outlet line L4, so that dialysate is introduced into the hemodialyzer 2.

[0018] As a result, dialysis is performed by transferring solutes and water between the blood and the dialysate across the dialysis membrane inside the hemodialyzer 2. Dialysis wastewater containing water and solutes transferred from the blood flows through the dialysate outlet line L4, and this dialysate wastewater is introduced into the console 3 and discharged to the outside of the blood purification device 1 via the dialysate drain line L5.

[0019] The console 3 controls the flow of blood and the flow of dialysis fluid. As shown in Fig. 1, the console 3 includes an operation display unit 4, a blood pump P, and a blood flow control device 10. As shown in Fig. 2, the operation display unit 4 includes a touch panel 5 and a rotary operation input unit 6.

[0020] The touch panel 5 functions as both a display unit that displays various information indicating the status of dialysis treatment and a touch-type input unit. The rotary operation input unit 6 is disposed below the touch panel 5.

[0021] The rotary operation input unit 6 is configured to be mechanically rotatable and is composed of a physical dial-type knob that can be grasped and rotated by a user (a medical professional operating the blood purification device 1). The rotary operation input unit 6 allows the user to set or change the flow rate value of blood pumped from the blood pump P by rotating the dial-type knob. In this embodiment, the rotary operation input unit 6 is disposed, for example, below the touch panel 5, and the user can input and adjust the flow rate value of blood pumped from the blood pump P by rotating the knob of the rotary operation input unit 6 while visually checking the blood flow rate value displayed on the touch panel 5.

[0022] The rotation operation input unit 6 is provided with a rotary encoder capable of outputting rotational displacement as a pulse signal. In this embodiment, as shown in FIG. 3, the rotation operation input unit 6 is rotated to the right (clockwise) or left (counterclockwise) with a predetermined unit rotation amount being one notch. The rotation operation input unit 6 outputs a pulse signal to the blood flow control device 10 for each unit rotation amount in each rotation direction. The unit of change in the flow rate of blood pumped from the blood pump P corresponding to the unit rotation amount in the rotation operation input unit 6 is determined and set in advance by experiment or the like.

[0023] In this embodiment, as shown in FIG. 3 , for example, in each rotation direction, the rotation operation input unit 6 is rotated by rotating a plurality of unit rotations (one notch), with a rotation amount of 22.5°. For example, the rotation operation input unit 6 is rotated one notch to rotate 22.5°, and then rotated four notches (one notch) four times to rotate 90°. A pulse signal is output from the rotary encoder of the rotation operation input unit 6 for each rotation operation of the unit rotation. The rotation operation input unit 6 is provided with a stop for each unit rotation (one notch) when rotated. Note that, in this embodiment, the unit rotation amount of the rotation operation input unit 6 is set to 22.5°, but this is not limited to this, and the unit rotation amount can be set arbitrarily.

[0024] The blood flow control device 10 (fluid flow control device) controls the flow rate value of blood (fluid) pumped from a blood pump P (flow rate adjusting means) by rotating a rotation operation input unit 6. The blood flow control device 10 controls the rotation operation input unit 6 to prevent erroneous operation. As shown in FIG. 4, the blood flow control device 10 has a rotation amount calculation determination unit 11, a rotation start / end determination unit 12, a flow rate change processing unit 13, and a flow rate value storage unit 14. The flow rate value storage unit 14 stores the flow rate value of blood pumped by the blood pump P.

[0025] A pulse signal output for each unit rotation amount from the rotation operation input unit 6 that has been rotated is input to the rotation amount calculation determination unit 11. The rotation amount calculation determination unit 11 determines the rotation direction of the rotation operation input unit 6 that has been rotated in the rotation operation input unit 6, and calculates the number of unit rotation amounts (rotation amount) that have been rotated in the rotation operation input unit 6.

[0026] The rotation amount calculation determination unit 11 determines whether or not a rotation operation of a predetermined unit rotation amount has been continuously performed a preset number of times (first set rotation amount) on the rotation operation input unit 6. The determination of the start and end of rotation of the rotation operation input unit 6 and the determination of whether or not the rotation operation of the rotation operation input unit 6 has been continuously performed are performed by the rotation start / end determination unit 12.

[0027] The rotation start / end determination unit 12 determines the start and end of rotation of the rotation operation input unit 6, and determines whether or not the rotation operation of the rotation operation input unit 6 is being performed continuously. More specifically, the rotation start / end determination unit 12 determines the start of rotation of the rotation operation input unit 6 when a pulse signal output from the rotation operation input unit 6 is input.

[0028] The rotation start / end determination unit 12 determines the end of the rotation operation of the rotation operation input unit 6 when there is no next rotation operation for a predetermined time after the end of the rotation operation of the rotation operation input unit 6. More specifically, the rotation start / end determination unit 12 determines the end of the rotation of the rotation operation input unit 6 when there is no pulse signal output for a predetermined time after the last pulse signal output from the rotation operation input unit 6. The rotation operation by the rotation operation input unit 6 is determined to be a continuous rotation operation when the rotation operation is performed at intervals shorter than the predetermined time, and is not determined to be a continuous rotation operation when the rotation operation is performed at intervals longer than the predetermined time. In this way, the rotation start / end determination unit 12 can determine the end of the rotation of the rotation operation input unit 6 when there is no pulse signal output for a predetermined time after the last pulse signal output from the rotation operation input unit 6. The predetermined time, which is a threshold for determining whether the rotation operation of the rotation operation input unit 6 is being performed continuously, is set to, for example, 1 to 3 seconds.

[0029] The rotation amount calculation determination unit 11 instructs the flow rate change processing unit 13 not to change the flow rate value of blood pumped from the blood pump P when a rotation operation of a predetermined unit rotation amount on the rotation operation input unit 6 is performed consecutively up to a preset number of times (first set rotation amount), but to change the flow rate value of blood pumped from the blood pump P in accordance with the number of times (rotation amount) exceeding the preset number of times when the rotation operation of the predetermined unit rotation amount on the rotation operation input unit 6 is performed consecutively beyond the preset number. Furthermore, the rotation amount calculation determination unit 11 controls the change of the flow rate value of blood pumped from the blood pump P in accordance with the rotation direction of the rotation operation of the rotation operation input unit 6.

[0030] The flow rate change processing unit 13 adjusts the rotation speed of the blood pump P in accordance with the determination result of the rotation amount calculation determination unit 11, and changes the flow rate value of blood pumped from the blood pump P.

[0031] More specifically, for example, if the preset number of unit rotations in the rotation operation input unit 6 is set to "3 times" (3 notches), the blood flow rate value will not be changed if the rotation operation of the unit rotation amount is performed three times (3 notches) in succession, but the blood flow rate value pumped out from the blood pump P will be changed if the rotation operation of the unit rotation amount is performed four times (4 notches) or more in succession. This prevents erroneous operation of the rotation operation input unit 6, even if the user's hand touches and rotates the rotation operation input unit 6, because the blood flow rate value will not be changed until the rotation operation of the unit rotation amount reaches three times (3 notches) (the preset number of times). Note that the "preset number of times" is not limited to three, and can be set to any number.

[0032] The flow rate change processing unit 13 adjusts the rotation speed of the blood pump P so as to achieve the changed blood flow rate value. The flow rate change processing unit 13 transmits the changed blood flow rate value of the blood pumped from the blood pump P to the touch panel 5. The touch panel 5 displays the blood flow rate value of the blood pumped from the blood pump P changed by the flow rate change processing unit 13. Upon completion of changing the flow rate value of the blood pumped from the blood pump P, the flow rate change processing unit 13 transmits the changed flow rate value of the blood pumped from the blood pump P to the flow rate value storage unit 14. The changed flow rate value of the blood pumped from the blood pump P is stored in the flow rate value storage unit 14.

[0033] Next, we will explain the control operation of the blood flow control device 10. The blood flow control device 10 can change the flow rate of blood pumped from the blood pump P. Furthermore, the blood flow control device 10 can execute control to prevent erroneous operation of the rotary operation input unit 6, and can change the flow rate of blood pumped from the blood pump P in a short time in an emergency.

[0034] When a user rotates the rotary operation input unit 6 to change the flow rate value of blood pumped from the blood pump P, in the blood flow control device 10, the rotation start / end determination unit 12 determines the start of rotation of the rotary operation input unit 6, the rotation amount calculation determination unit 11 calculates the number of unit rotations of the rotary operation input unit 6, and performs the control operation until the end of rotation of the rotary operation input unit 6 is determined.

[0035] Here, the blood flow control device 10 executes malfunction prevention control to prevent erroneous operation of the rotation operation input unit 6. When the rotation operation input unit 6 is operated continuously for a unit rotation amount exceeding a preset number of times (first set rotation amount), the blood flow control device 10 changes the current flow rate value read out from the flow rate value storage unit 14 by the flow rate change processing unit 13 and displays it on the touch panel 5. When the rotation operation input unit 6 is operated continuously for a predetermined unit rotation amount up to the preset number of times, the blood flow control device 10 does not change the flow rate value of blood pumped from the blood pump P. Specific examples of the malfunction prevention control of the blood flow control device 10 include the following first and second malfunction prevention examples.

[0036] A first example of preventing erroneous operation will be described. In the first example of preventing erroneous operation, for example, as shown in Fig. 5, the blood flow rate value is 100 mL / min, the flow rate change unit when rotated by a unit rotation amount is 5 mL / min, and the preset number of rotation operations of the unit rotation amount by the rotation operation input unit 6 (first set rotation amount) is "3 times (3 notches)".

[0037] In this case, if the rotation operation input unit 6 is rotated in a direction that increases the flow rate value (for example, right rotation (clockwise)) for up to three consecutive unit rotations (three notches), the blood flow rate value will not be changed from 100 mL / min.

[0038] On the other hand, if four consecutive input operations (four notches) of the unit rotation amount are performed in a rotation direction that increases the flow rate value of the rotation operation input unit 6 (for example, right rotation (clockwise)), the blood flow rate value will change from 100 mL / min to 105 mL / min, and if five consecutive input operations (five notches) of the unit rotation amount are performed, the blood flow rate value will change from 105 mL / min to 110 mL / min.

[0039] In this way, when the rotation operation input unit 6 is operated four or more times (four notches) consecutively by the unit rotation amount, the blood flow rate value can be changed. On the other hand, the blood flow rate value does not change until the rotation operation is performed three times (three notches) by the unit rotation amount. Therefore, even if the user's hand touches and rotates the rotation operation input unit 6, the blood flow rate value does not change until the rotation operation is performed three times (three notches) by the unit rotation amount (the set number of times), thereby preventing erroneous operation of the rotation operation input unit 6.

[0040] A second example of preventing erroneous operation will be described. In the second example of preventing erroneous operation, for example, as shown in Fig. 6, the blood flow rate value is 100 mL / min, the flow rate change unit when rotated by a unit rotation amount is 10 mL / min, and the preset number of rotation operations of the unit rotation amount by the rotation operation input unit 6 (first set rotation amount) is "two times (two notches)."

[0041] In this case, if continuous input operations are performed up to two unit rotations (two notches) in a rotation direction that increases the flow rate value of the rotation operation input unit 6 (for example, right rotation (clockwise)), the blood flow rate value will not be changed from 100 mL / min.

[0042] On the other hand, the rotation operation input unit 6 is rotated in a direction that increases the flow rate value (for example, right rotation (clockwise)). When the input operation is performed three times (three notches) in a row for the unit rotation amount, the blood flow rate value is changed from 100 mL / min to 110 mL, and when the input operation is performed four times (fourth notch) in a row for the unit rotation amount, the blood flow rate value is changed from 110 mL to 120 mL / min.

[0043] Thereafter, the rotation direction of the rotation operation input unit 6 is changed to a rotation operation that decreases the flow rate value of the rotation operation input unit 6 (for example, left rotation (counterclockwise)), and when the fifth (fifth notch) input operation of the unit rotation amount is performed in succession, the change in rotation direction changes the blood flow rate value from 120 mL / min to 110 mL / min, and when the sixth (sixth notch) consecutive input operation of the unit rotation amount is performed, the value changes from 110 mL / min to 100 mL / min, and when the seventh (seventh notch) consecutive input operation of the unit rotation amount is performed, the value changes from 100 mL / min to 90 mL / min.

[0044] In this way, when three or more consecutive input operations (three notches) are performed on the rotary operation input unit 6, the blood flow rate value can be changed. On the other hand, the blood flow rate value does not change until the rotary operation of the unit rotation amount is performed twice (two notches). Therefore, even if the user's hand touches and rotates the rotary operation input unit 6, the blood flow rate value does not change until the rotary operation of the unit rotation amount is performed twice (two notches) (the set number of times), thereby preventing erroneous operation of the rotary operation input unit 6.

[0045] Next, the blood flow rate change control for changing the blood flow rate value of the blood flow rate control device 10 in an emergency will be described. In an emergency, for example, it may be necessary to quickly change the blood flow rate value of the blood pump P from 300 mL / min to 0 mL / min. For example, one method is to press the stop switch to change the blood flow rate value of the blood pump P to 0 mL / min. However, in an emergency, it may be difficult to make a calm decision, and it is expected that some users will quickly rotate the rotation operation input unit 6 to set the blood flow rate value to 0 mL / min rather than operating the stop switch. Furthermore, because setting the blood flow rate to 0 mL / min will stop dialysis therapy, it is also expected that some users will set the blood flow rate to a value of around 10 to 100 mL / min even in an emergency.

[0046] Conventionally, there is an extracorporeal circulation device that can change the flow rate of blood pumped from a blood pump when a rotation operation input unit is continuously rotated for more than a predetermined time (see Patent Document 1, a prior art document). In this extracorporeal circulation device, even if a rotation operation is performed using the rotation operation input unit within the predetermined time, the flow rate of blood pumped from the blood pump does not change, so erroneous operation of the rotation operation input unit can be prevented. However, in such an extracorporeal circulation device, because the blood flow rate cannot be changed within the predetermined time, it is not possible to quickly reduce the blood flow rate in an emergency.

[0047] In contrast, the present invention can change the flow rate of the blood pump P when the rotation operation of the rotation operation input unit 6 by a predetermined unit rotation amount is performed consecutively more than a preset number of times. The blood flow control device 10 of the present invention controls the flow rate value of blood pumped from the blood pump P to be reduced to a predetermined flow rate value when the rotation operation input unit 6 is rotated by a predetermined unit rotation amount on the rotation operation input unit 6 consecutively more than a preset number of times (first set rotation amount) in a rotation direction that reduces the flow rate value of blood pumped from the blood pump P. Therefore, in an emergency, when the rotation operation input unit 6 is rotated in a short time, the flow rate value of blood pumped from the blood pump P can be changed as intended by the user.

[0048] 7, the blood flow rate value is 300 mL / min, the flow rate change unit when rotated by a unit rotation amount is 5 mL / min, and the preset number of rotation operations of the unit rotation amount (first set rotation amount) by the rotation operation input unit 6 is "5 times." In this case, in an emergency, the user performs a rotation operation to quickly rotate the rotation operation input unit 6 in a rotation direction (for example, left rotation (counterclockwise)) that reduces the blood flow rate value.

[0049] In this case, if six consecutive input operations (six notches) of the unit rotation amount are performed in a rotation direction that decreases the flow rate value of the rotation operation input unit 6 (for example, left rotation (counterclockwise)), the blood flow rate value will change from 300 mL / min to 295 mL / min, and if a seventh consecutive input operation (seventh notch) of the unit rotation amount is performed, it will change to 290 mL / min.As further consecutive input operations are performed, the blood flow rate value will decrease by 5 mL / min each time, and as a result, if more than 65 rotation operations (65 notches) of the unit rotation amount are performed, the blood flow rate value will change to 0 mL / min.

[0050] In this way, by quickly rotating the rotary operation input unit 6, the flow rate of blood pumped from the blood pump P can be changed to 0 mL / min in a short time (for example, within 0.5 seconds). Therefore, in an emergency, the flow rate of blood pumped from the blood pump P can be changed and reduced in a short time.

[0051] In this embodiment, an example will be described in which the blood flow rate is not changed from 300 mL / min to 0 mL / min. If a user who rotates the rotary operation input unit 6 in one go in an emergency during dialysis can change the blood flow rate from 300 mL / min to, for example, 100 mL / min in a short time (for example, within 0.1 seconds) by rotating the rotary operation input unit 6 only once instantaneously, the blood flow rate will be a slow value, which is safe and effective because it does not stop dialysis therapy even when the value is not 0 mL / min. 8, when the rotation operation input unit 6 is rotated in a direction that reduces the flow rate of blood pumped from the blood pump P by a predetermined unit rotation amount (e.g., 10 times (10 notches)) or more consecutive times in a preset time (e.g., within 0.1 seconds) that is greater than the first set rotation amount, the blood flow control device 10 reduces the flow rate of blood pumped from the blood pump P to a predetermined flow rate value (e.g., 100 mL / min) and temporarily ignores any subsequent consecutive inputs. This allows the blood flow rate to be changed from 300 mL / min to 100 mL / min in an even shorter time (0.1 seconds in this example) by a single instantaneous rotation of the rotation operation input unit 6.

[0052] The blood flow control device 10 according to the above embodiment has the following advantages. In the above embodiment, the blood flow control device 10 is configured to control the flow rate value of blood pumped from the blood pump P by rotation of the rotation operation input unit 6, and is configured to not change the flow rate value of blood pumped from the blood pump P when a rotation operation of a predetermined unit rotation amount on the rotation operation input unit 6 is performed consecutively up to a preset number of times (first set rotation amount), but to change the flow rate value of blood pumped from the blood pump P in accordance with the number of times (rotation amount) exceeding the preset number of times when the rotation operation of the rotation operation input unit 6 is performed consecutively beyond the preset number. This makes it possible to prevent erroneous operation of the rotation operation input unit 6 when the flow rate value of blood pumped from the blood pump P is controlled by rotation of the rotation operation input unit 6, and to change the flow rate value of blood in a short time in an emergency.

[0053] Furthermore, in this embodiment, the flow rate value of blood pumped from the blood pump P can be changed depending on the rotation direction of the rotation operation input unit 6. This prevents erroneous operation of the rotation operation input unit 6 regardless of the rotation direction of the rotation operation input unit 6, and also enables the flow rate value of blood pumped from the blood pump P to be changed in a short time in an emergency.

[0054] Furthermore, in this embodiment, the rotation start / end determination unit 12 determines that the rotation operation of the rotation operation input unit 6 has ended when there is no next rotation operation for a predetermined time after the end of a rotation operation of a predetermined unit rotation amount on the rotation operation input unit 6. This makes it easy to determine whether the rotation operation of the rotation operation input unit 6 is being performed continuously.

[0055] Furthermore, in this embodiment, the blood flow control device 10 controls the flow rate value of blood pumped from the blood pump P to be reduced to a predetermined flow rate value when the rotation operation input unit 6 is rotated in a rotation direction that reduces the flow rate value of blood pumped from the blood pump P by a predetermined unit rotation amount continuously more than a preset number of times. This allows the flow rate value of blood pumped from the blood pump P to be reduced in a short time in an emergency.

[0056] The present invention is not limited to the above-described embodiment, and includes modifications and improvements within the scope of achieving the object of the present invention.

[0057] For example, in the above embodiment, it is also possible to sound a sound when the rotation operation input unit 6 is continuously performed more than a preset number of times (first set rotation amount). This makes it easier for the operator to understand that the blood flow rate has started to change by sounding a sound. Furthermore, if the rotation operation input unit 6 is continuously performed more than a preset number of times, the color of the blood flow rate value or the surrounding area of ​​the value can be temporarily changed (for example, for 0.1 to 1.0 seconds, or until it is determined that the rotation operation has not been performed for a predetermined time), making it even easier for the operator to understand the change in blood flow rate.

[0058] Furthermore, while the above embodiment has been described as controlling the blood flow rate, the present invention is not limited thereto and may also be applied to controlling the flow rate of saline or dialysate during priming or supply of replacement or substitution fluid. As shown in FIG. 9 , the fluid flow rate control device may control the flow rate of the fluid delivered from the flow rate adjustment means to increase to a predetermined flow rate (e.g., 250 mL / min) when the rotation operation input unit 6 is rotated by a predetermined unit rotation amount (e.g., 10 times (10 notches)) or more consecutively within a predetermined time (e.g., within 0.1 seconds) in a direction that increases the flow rate of the fluid delivered from the flow rate adjustment means. In this case, a single instantaneous rotation of the rotation operation input unit 6 can change the flow rate of the fluid from 0 mL / min to 250 mL / min in a short time (0.1 seconds in this example). This control of increasing the flow rate of saline or dialysate in a short time may also be applied to the control of blood flow rate. [Explanation of symbols]

[0059] 1. Blood purification device (extracorporeal circulation device) 6 Rotation operation input section 10 Blood flow control device (fluid flow control device) P Blood pump (flow rate control means)

Claims

1. A fluid flow rate control device that controls a flow rate value of a fluid sent out from a flow rate adjusting means by rotating a rotary operation input unit, a rotation operation input unit configured to rotate the fluid by a predetermined unit rotation amount continuously up to a predetermined first set rotation amount, and to change the flow rate of the fluid discharged from the flow rate adjustment unit to a flow rate value corresponding to the rotation amount exceeding the first set rotation amount when the rotation operation input unit performs the rotation operation by a predetermined unit rotation amount continuously up to a predetermined first set rotation amount.

2. 2. The fluid flow control device according to claim 1, wherein the change in the flow rate value of the liquid delivered from said flow rate adjusting means is controlled in accordance with the direction of rotation of said rotary operation input portion.

3. 3. The fluid flow rate control device according to claim 1, wherein the end of the rotation operation of the rotation operation input unit is determined when there is no next rotation operation for a predetermined time after the end of the rotation operation of the rotation operation input unit.

4. 4. The fluid flow control device according to claim 1, wherein when the rotation operation input unit is rotated in a rotation direction that reduces the flow rate value of the fluid sent out from the flow rate adjustment means by continuously performing a rotation operation of a predetermined unit rotation amount on the rotation operation input unit by a predetermined second set rotation amount or more, which is larger than the first set rotation amount, within a predetermined time, the flow rate value of the fluid sent out from the flow rate adjustment means is controlled to be reduced to a predetermined flow rate value.

5. 5. The fluid flow control device according to claim 1, wherein when the rotation operation input unit is rotated in a rotation direction that increases the flow rate value of the fluid sent out from the flow rate adjustment means by continuously performing a rotation operation of a predetermined unit rotation amount on the rotation operation input unit by a predetermined third set rotation amount or more, which is greater than the first set rotation amount, within a predetermined time, the flow rate value of the fluid sent out from the flow rate adjustment means is controlled to increase to a predetermined flow rate value.

6. A flow rate adjusting means; the rotary operation input unit configured to be mechanically rotatable and capable of performing a rotary operation to change the flow rate value of the fluid sent out from the flow rate adjusting means; An extracorporeal circulation device comprising: a fluid flow rate control device according to any one of claims 1 to 5, which controls the flow rate value of the fluid delivered from the flow rate adjusting means by rotating the rotary operation input unit.

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