Fluid flow control device and extracorporeal circulation device

Abstract

Provided are a fluid flow rate control device and an extracorporeal circulation device capable of preventing misoperation of a rotation operation input section and capable of changing a flow rate value of a fluid in a short time in an emergency. A fluid flow rate control device (10) is controlled in such a manner that a flow rate value of a fluid sent from a flow rate adjustment unit (P) is controlled by rotation operation of a rotation operation input section (6), in the case where rotation operation of a prescribed unit rotation amount in the rotation operation input section (6) is continuously performed up to a first set rotation amount set in advance, the flow rate value of the fluid sent from the flow rate adjustment unit (P) is not changed, and in the case where rotation operation of the prescribed unit rotation amount in the rotation operation input section (6) is continuously performed beyond the first set rotation amount, the flow rate value of the fluid sent from the flow rate adjustment unit (P) is changed according to the rotation amount beyond the first set rotation amount.

Description

Technical Field

[0001] This invention relates to fluid flow control devices and extracorporeal circulation devices. Background Technology

[0002] Conventional extracorporeal circulation devices include a blood circuit, a blood pump (flow adjustment unit) disposed in the blood circuit, and a rotary operation input unit of the type that can adjust the flow rate of blood (fluid) delivered 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 delivered from the blood pump if the rotary operation input unit is continuously rotated for a predetermined time. Therefore, even if the user's hand touches the rotary operation input unit and rotates it within the predetermined time, the flow rate of blood delivered from the blood pump will not change, thus preventing accidental operation of the rotary operation input unit.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent No. 4573019 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] In the extracorporeal circulation device of Patent Document 1, in an emergency where it is desired to reduce the flow rate of blood pumped from the blood pump in a short period of time, even if the rotary operation input is rotated rapidly, the blood flow rate cannot be changed within a specified time, thus preventing a rapid reduction in the blood flow rate. Therefore, it is desirable to prevent maloperation of the rotary operation input and to be able to change the flow rate of blood pumped from the blood pump in a short period of time in an emergency.

[0008] The purpose of this invention is to provide a fluid flow control device and an external circulation device that can prevent maloperation of the rotary operation input and can change the fluid flow rate value in a short time in an emergency.

[0009] Methods for solving problems

[0010] This invention relates to a fluid flow control device that controls the flow rate of fluid delivered from a flow adjustment unit by rotating a rotary operation input. The fluid flow control device controls the flow rate in such a way that when a predetermined unit rotation operation in the rotary operation input is continuously performed until a preset first rotation amount is reached, the flow rate of fluid delivered from the flow adjustment unit is not changed; when a predetermined unit rotation operation in the rotary operation input is continuously performed until the first preset rotation amount is exceeded, the flow rate of fluid delivered from the flow adjustment unit is changed according to the rotation amount exceeding the first preset rotation amount.

[0011] Furthermore, it is preferable to control the change in the flow rate of the liquid delivered from the aforementioned flow rate adjustment unit based on the rotation direction of the rotation operation of the aforementioned rotation operation input unit.

[0012] Furthermore, it is preferable to determine that the rotation operation of the aforementioned rotation operation input unit has ended if there is no next rotation operation within a specified time after the rotation operation in the aforementioned rotation operation input unit has ended.

[0013] Furthermore, it is preferable that when the rotation operation of the predetermined unit rotation amount in the aforementioned rotation operation input unit is continuously performed for a second predetermined rotation amount or more within a predetermined time, and the aforementioned rotation operation input unit rotates in a rotation direction that reduces the flow rate of the fluid delivered from the aforementioned flow rate adjustment unit, the control is performed in such a way that the flow rate of the fluid delivered from the aforementioned flow rate adjustment unit is reduced to a predetermined flow rate, wherein the aforementioned second predetermined rotation amount is greater than the aforementioned first predetermined rotation amount.

[0014] Furthermore, it is preferable that when the rotation operation of the predetermined unit rotation amount in the aforementioned rotation operation input unit is continuously performed for a third predetermined rotation amount or more within a predetermined time, and the aforementioned rotation operation input unit rotates in a rotation direction that increases the flow rate value of the fluid delivered from the aforementioned flow rate adjustment unit, the control is performed in such a way that the flow rate value of the fluid delivered from the aforementioned flow rate adjustment unit is increased to a predetermined flow rate value, wherein the aforementioned third predetermined rotation amount is greater than the aforementioned first predetermined rotation amount.

[0015] Furthermore, the present invention relates to an extracorporeal circulation device comprising: a flow adjustment unit; the aforementioned rotary operation input unit configured to be mechanically rotatable, capable of performing a rotary operation to perform an operation to change the flow rate value of the fluid delivered from the aforementioned flow adjustment unit; and the aforementioned fluid flow control device, which controls the flow rate value of the fluid delivered from the aforementioned flow adjustment unit by the rotary operation input unit.

[0016] Invention Effects

[0017] According to the present invention, a fluid flow control device and an external circulation device are provided that can prevent maloperation of the rotary operation input and can change the fluid flow rate value in a short time in an emergency. Attached Figure Description

[0018] [ Figure 1 [Illustration 1] is a diagram showing the blood purification apparatus according to this embodiment.

[0019] [ Figure 2 [This is a perspective view showing the control panel of the blood purification device.]

[0020] [ Figure 3 [ ] is a diagram illustrating the unit rotation amount of the rotary operation input section.

[0021] [ Figure 4 [ ] is a block diagram of a blood flow control device.

[0022] [ Figure 5 [ ] is a timing diagram illustrating the first example of misoperation prevention control.

[0023] [ Figure 6 [ ] is a timing diagram illustrating the second example of misoperation prevention control.

[0024] [ Figure 7 [This is a timing diagram showing the control of blood flow changes during an emergency.]

[0025] [ Figure 8 [This is a timing diagram showing the control of blood flow changes during an emergency.]

[0026] [ Figure 9 [This is a timing diagram of the change control that increases the fluid flow rate value.] Detailed Implementation

[0027] Hereinafter, a preferred embodiment of the extracorporeal circulation apparatus including a blood flow control device of the present invention will be described with reference to the accompanying drawings. In this invention, as an example of an extracorporeal circulation apparatus, a blood purification apparatus 1 capable of performing dialysis therapy will be described. The blood purification apparatus 1 described in this embodiment is an automatic blood purification apparatus that continuously and automatically performs the following steps by controlling the flow of dialysate in the blood circuit: a pre-rinsing step of cleaning the components of the apparatus, a blood removal step of removing blood from the patient, a dialysis step of removing residual water from the blood, and a return blood step of returning blood to the patient.

[0028] like Figure 1As shown, the blood purification device 1 includes: a hemodialyzer 2 (such as a dialyzer and a hemodiafilter); an arterial blood line L1; a venous blood line L2; a dialysate inlet line L3; a dialysate outlet line L4; a control console 3; and a dialysate drain line L5. The control 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 constructed primarily of flexible tubing capable of fluid flow.

[0029] Hemodialysis machine 2 is connected to arterial blood tubing L1 and venous blood tubing L2. Blood from patient H is introduced into hemodialysis machine 2 via blood pump P, which is located in arterial blood tubing L1. Blood pump P is mounted on control console 3. A blood circuit is installed on blood pump P.

[0030] A 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, which pumps blood out of the arterial side blood line L1 by squeezing it with the roller pump. The hemodialyzer 2 is connected to the dialysate inlet line L3 and the dialysate outlet line L4, thereby introducing dialysate into the hemodialyzer 2.

[0031] Thus, inside the hemodialyzer 2, solutes and water move between the blood and dialysate through the dialysis membrane, thereby performing dialysis. Dialysis fluid containing water and solutes flows from the blood in the dialysate outlet line L4. This dialysate is introduced into the control console 3 and discharged to the outside of the blood purification device 1 via the dialysate outlet line L5.

[0032] Console 3 controls the flow of blood and dialysate. For example... Figure 1 As shown, the control console 3 includes an operation display unit 4, a blood pump P, and a blood flow control device 10. (As shown...) Figure 2 As shown, the operation display unit 4 includes a touch panel 5 and a rotary operation input unit 6.

[0033] The touch panel 5 functions as both a display unit for showing various information indicating the status of dialysis treatment and a touch-sensitive input unit. A rotary operation input unit 6 is located below the touch panel 5.

[0034] The rotary operation input unit 6 is configured as a mechanically rotatable physical handle that can be grasped and rotated by a user (a medical professional operating the blood purification device 1). By rotating the rotary handle, the user can set or change the flow rate of blood delivered from the blood pump P. In this embodiment, the rotary operation input unit 6 is positioned, for example, below the touch panel 5. The user can input and adjust the flow rate of blood delivered from the blood pump P by rotating the handle of the rotary operation input unit 6 while observing the blood flow rate displayed on the touch panel 5.

[0035] A rotary encoder capable of outputting rotational displacement as a pulse signal is provided in the rotary operation input unit 6. In this embodiment, as... Figure 3 As shown, the rotation input unit 6 has a defined unit rotation amount of one scale, and the rotation operation is performed by rotating clockwise or counterclockwise. Each time the rotation input unit 6 rotates by a unit amount in each rotation direction, it outputs a pulse signal to the blood flow control device 10. In the rotation input unit 6, the unit of change in blood flow rate delivered by the blood pump P corresponding to the unit rotation amount is determined and set through prior experiments, etc.

[0036] In this embodiment, such as Figure 3 As shown, for example, in each rotation direction, the rotation operation input unit 6 uses a rotation amount of 22.5° as the unit rotation amount (1 scale increment), and performs rotation operations by rotating multiple times in unit rotation amounts. For example, rotating the rotation operation input unit 6 by 1 scale increment is a rotation of 22.5°, and by rotating 4 times in unit rotation increments, it rotates 4 scale increments, thereby rotating 90°. Each time a unit rotation amount rotation operation is performed, a pulse signal is output from the rotary encoder of the rotation operation input unit 6. During rotation, the rotation operation input unit 6 provides a pause point at each unit rotation amount (1 scale increment). It should be noted that in this embodiment, the unit rotation amount of the rotation operation input unit 6 is set to 22.5°, but it is not limited to this, and the unit rotation amount can be arbitrarily set.

[0037] The blood flow control device 10 (fluid flow control device) controls the flow rate of blood (fluid) delivered from the blood pump P (flow adjustment unit) by rotating the rotary operation input unit 6. The blood flow control device 10 controls the flow in a manner to prevent accidental operation of the rotary operation input unit 6. Figure 4 As shown, the blood flow control device 10 includes a rotation amount calculation and determination unit 11, a rotation start and 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 the blood delivered by the blood pump P.

[0038] The pulse signal output for each unit rotation is input from the rotation operation input unit 6, which performs the rotation operation, to the rotation amount calculation and determination unit 11. The rotation amount calculation and determination unit 11 determines the rotation direction of the rotation operation input unit 6, which performs the rotation operation, and calculates the number of times (rotation amount) the unit rotation operation is performed in the rotation operation input unit 6.

[0039] The rotation amount calculation determination unit 11 determines whether the rotation operation with a specified unit rotation amount in the rotation operation input unit 6 has been continuously performed up to a preset number of times (first preset rotation amount). The rotation start and end determination unit 12 determines the start and end of the rotation of the rotation of the rotation of the rotation operation input unit 6, and determines whether the rotation operation of the rotation operation input unit 6 is continuous.

[0040] The rotation start / end determination unit 12 determines the start and end of the rotation of the rotation operation input unit 6, and determines whether the rotation operation of the rotation operation input unit 6 is continuous. More specifically, the rotation start / end determination unit 12 determines that the rotation of the rotation operation input unit 6 has started when a pulse signal output from the rotation operation input unit 6 is input.

[0041] The rotation start / end determination unit 12 determines that the rotation operation of the rotation operation input unit 6 has ended if no further rotation operation occurs within a specified time after the rotation operation in the rotation operation input unit 6 has ended. More specifically, the rotation start / end determination unit 12 determines that the rotation of the rotation operation input unit 6 has ended if no pulse signal is output within a specified time after the last pulse signal output from the rotation operation input unit 6. For the rotation operation of the rotation operation input unit 6, if the rotation operation is performed at an interval shorter than the specified time, it is considered a continuous rotation operation; if the rotation operation is performed at an interval longer than the specified time, it is not considered a continuous rotation operation. Therefore, the rotation start / end determination unit 12 can determine that the rotation of the rotation operation input unit 6 has ended if no pulse signal is output within a specified time after the last pulse signal output from the rotation operation input unit 6. The specified time, which is the threshold for determining whether the rotation operation of the rotation operation input unit 6 is continuous, is set to, for example, 1 to 3 seconds.

[0042] The rotation amount calculation and determination unit 11 instructs the flow rate change processing unit 13 in the following manner: If the rotation operation with a predetermined unit rotation amount in the rotation operation input unit 6 is continuously performed up to a preset number of times (first preset rotation amount), the flow rate of the blood delivered from the blood pump P is not changed; if the rotation operation with a predetermined unit rotation amount in the rotation operation input unit 6 is continuously performed beyond the preset number of times, the flow rate of the blood delivered from the blood pump P is changed according to the number of times the preset number of times is exceeded (rotation amount). Furthermore, the rotation amount calculation and determination unit 11 controls the change of the flow rate of the blood delivered from the blood pump P according to the rotation direction of the rotation operation in the rotation operation input unit 6.

[0043] The flow rate change processing unit 13 calculates the determination result of the determination unit 11 based on the rotation amount and adjusts the rotation speed of the blood pump P to change the flow rate of the blood pump P.

[0044] More specifically, for example, if the preset number of rotations per unit amount in the rotation operation input unit 6 is set to "3 times" (3 scales), the blood flow rate remains unchanged when the rotation operation is performed continuously for 3 times (3 scales), but changes the blood flow rate delivered by the blood pump P when the rotation operation is performed continuously for 4 times (4 scales) or more. Therefore, even if the user touches and rotates the rotation operation input unit 6, the blood flow rate will not change until the rotation operation is performed 3 times (3 scales) (the preset number of rotations), thus preventing accidental operation of the rotation operation input unit 6. It should be noted that the "preset number of rotations" is not limited to 3 times and can be set to any number of rotations.

[0045] The flow rate change processing unit 13 adjusts the rotation speed of the blood pump P to obtain the changed blood flow rate value. The flow rate change processing unit 13 sends the changed blood flow rate value from the blood pump P to the touch panel 5. The touch panel 5 displays the changed blood flow rate value from the blood pump P as determined by the flow rate change processing unit 13. When the change of the blood flow rate value from the blood pump P is complete, the flow rate change processing unit 13 sends the changed blood flow rate value from the blood pump P to the flow rate value storage unit 14. The flow rate value storage unit 14 stores the changed blood flow rate value from the blood pump P.

[0046] Next, the control operation of the blood flow control device 10 will be explained. The blood flow control device 10 can change the flow rate of blood delivered from the blood pump P. In addition, the blood flow control device 10 can perform control to prevent misoperation of the rotary operation input unit 6, and can change the flow rate of blood delivered from the blood pump P in a short time in an emergency.

[0047] When a user rotates the rotation operation input unit 6 to change the flow rate of blood delivered from the blood pump P, the rotation start-end determination unit 12 in the blood flow control device 10 determines the start of rotation of the rotation operation input unit 6, the rotation amount calculation determination unit 11 calculates the number of times the rotation operation input unit 6 rotates by a unit amount, and executes control actions until it is determined that the rotation of the rotation operation input unit 6 has ended.

[0048] Here, the blood flow control device 10 performs malfunction prevention control to prevent misoperation of the rotation operation input unit 6. If the blood flow control device 10 continuously performs rotation operations at a predetermined unit rotation amount more than a preset number of unit rotations (first preset rotation amount), the flow rate change processing unit 13 changes the current flow rate value read from the flow rate value storage unit 14 and displays it on the touch panel 5. If the blood flow control device 10 continuously performs rotation operations at a predetermined unit rotation amount in the rotation operation input unit 6 up to a preset number of times, it does not change the flow rate value of the blood delivered from the blood pump P.

[0049] Specific examples of malfunction prevention control for the blood flow control device 10 include the following first malfunction prevention example and second malfunction prevention example.

[0050] The first example of preventing misoperation will be explained. In the first example of preventing misoperation, for example, as follows: Figure 5 As shown, when rotating at a unit rotation volume with a blood flow rate of 100 mL / min, the flow rate change unit is 5 mL / min. For example, the preset number of rotation operations (first preset rotation volume) for the unit rotation volume of the rotation operation input unit 6 is "3 times (3 scales)".

[0051] At this time, if a continuous input operation is performed in the direction of rotation that increases the flow rate value of the rotary operation input unit 6 (for example, right rotation (clockwise)) for a unit rotation amount of 3 times (3 scales), the blood flow rate value will not change from 100 mL / min.

[0052] On the other hand, when a continuous input operation of 4 rotations (4 scales) is performed in the direction of rotation that increases the flow rate value of the rotary operation input unit 6 (for example, clockwise rotation), the blood flow rate value changes from 100 mL / min to 105 mL / min. When a fifth input operation of 5 rotations (5 scales) is performed, the blood flow rate value changes from 105 mL / min to 110 mL / min.

[0053] In this way, when the rotation input unit 6 is continuously rotated 4 times (4 scales) or more, the blood flow rate can be changed. On the other hand, the blood flow rate remains unchanged up to 3 times (3 scales). Therefore, even if the user touches and rotates the rotation input unit 6, the blood flow rate will not change up to 3 times (3 scales) (the set number of times) because the rotation operation will not change the blood flow rate, thus preventing accidental operation of the rotation input unit 6.

[0054] The second example of preventing misoperation will be explained. In the second example of preventing misoperation, for example, as follows: Figure 6 As shown, when rotating at a unit rotation volume with a blood flow rate of 100 mL / min, the flow rate change unit is 10 mL / min. For example, the preset number of rotation operations (first preset rotation volume) for the unit rotation volume of the rotation operation input unit 6 is "2 times (2 scales)".

[0055] At this time, if a continuous input operation is performed in the direction of rotation that increases the flow rate value of the rotary operation input unit 6 (for example, right rotation (clockwise)) for a unit rotation amount of 2 times (2 scales), the blood flow rate value will not change from 100 mL / min.

[0056] On the other hand, the rotation operation is performed in the direction that increases the flow rate value of the rotation operation input unit 6 (for example, clockwise rotation). When a continuous input operation with a unit rotation amount of 3 times (3 scales) is performed, the blood flow rate value changes from 100 mL / min to 110 mL. When a fourth input operation with a unit rotation amount of 4 times (4 scales) is performed, the blood flow rate value changes from 110 mL / min to 120 mL / min.

[0057] Then, the rotation direction of the rotary operation input unit 6 is changed to a rotation operation that reduces the flow rate value of the rotary operation input unit 6 (for example, left rotation (counterclockwise)). When continuing to perform the input operation with a unit rotation amount of 5 times (5 scales), by changing the rotation direction, the blood flow rate value is changed from 120 mL / min to 110 mL / min. Under the continuous input operation with a unit rotation amount of 6 times (6 scales), it is changed from 110 mL / min to 100 mL / min. Under the continuous input operation with a unit rotation amount of 7 times (7 scales), it is changed from 100 mL / min to 90 mL / min.

[0058] In this way, when the rotation input unit 6 is operated continuously for 3 times (3 scales) or more, the blood flow rate can be changed. On the other hand, the blood flow rate is not changed until the rotation operation is performed 2 times (2 scales) per unit rotation amount. Therefore, even if the user touches and rotates the rotation input unit 6, the blood flow rate will not change until the rotation operation is performed 2 times (2 scales) per unit rotation amount (set number of times), thus preventing accidental operation of the rotation input unit 6.

[0059] Next, the blood flow change control of the blood flow control device 10 in emergency situations will be explained.

[0060] In emergencies, such as when it's desirable to quickly change the blood flow rate from blood pump P from 300 mL / min to 0 mL / min, a method exists where pressing a stop switch changes the flow rate to 0 mL / min. However, it's also conceivable that in an emergency, a calm judgment might be difficult to make, leading to a user who, instead of using the stop switch, rotates the rotary input unit 6 all at once to reduce the blood flow rate to 0 mL / min. Furthermore, since dialysis therapy stops at 0 mL / min, it's also conceivable that even in an emergency, the flow rate wouldn't change to 0 mL / min, but rather to approximately 10-100 mL / min.

[0061] Conventional extracorporeal circulation devices (ECV devices) can change the flow rate of blood pumped from a blood pump if the rotation operation of the input unit is performed continuously for a predetermined time (see Patent Document 1 in the prior art). In this ECV device, even if the rotation operation of the input unit is performed within the predetermined time, the flow rate of blood pumped from the blood pump will not change, thus preventing malfunction of the input unit. However, in such an ECV device, the blood flow rate cannot be changed within the predetermined time, therefore, the blood flow rate cannot be reduced in a short period of time in an emergency.

[0062] In response to this, the present invention can change the flow rate of the blood pump P when the rotation operation input unit 6 is continuously rotated by a predetermined unit rotation amount more than a preset number of times. The blood flow control device 10 of the present invention controls the flow rate of the blood pump P to decrease to a predetermined flow rate value when the rotation operation input unit 6 is continuously rotated by a predetermined unit rotation amount more than a preset number of times (first preset rotation amount) and the rotation operation input unit 6 is rotated in a rotation direction that reduces the flow rate of blood delivered from the blood pump P. Therefore, in an emergency, by rotating the rotation operation input unit 6 for a short period of time, the flow rate of blood delivered from the blood pump P can be changed according to the user's intention.

[0063] More specifically, for example, such as Figure 7 As shown, when rotating at a unit rotation volume of 300 mL / min, the flow rate change unit is 5 mL / min. For example, the preset number of rotation operations (first preset rotation volume) for the unit rotation volume of the rotation operation input unit 6 is set to "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 that reduces the blood flow rate (e.g., left rotation (counterclockwise)).

[0064] At this time, when a continuous input operation of 6 rotations (6 scales) is performed in the direction that reduces the flow rate value of the rotation operation input unit 6 (for example, left rotation (counterclockwise)), the blood flow rate value changes from 300 mL / min to 295 mL / min. When a 7th input operation of 7 rotations is performed, it changes to 290 mL / min. By further performing continuous input operations, the blood flow rate value decreases by 5 mL / min each time. As a result, when a rotation operation of 65 rotations (65 scales) or more is performed, the blood flow rate value changes to 0 mL / min.

[0065] In this way, by rapidly rotating the input unit 6, the flow rate of blood pumped from the blood pump P can be changed to 0 mL / min within a short time (e.g., within 0.5 seconds). Therefore, in an emergency, the flow rate of blood pumped from the blood pump P can be reduced quickly.

[0066] Furthermore, in this embodiment, an example of changing the blood flow rate value from 300 mL / min to 0 mL / min will be described. In an emergency during dialysis, if the user rotates the operation input unit 6 in one go, the blood flow rate value can be changed from 300 mL / min to, for example, 100 mL / min in a short time (e.g., within 0.1 seconds) by rotating the operation input unit 6 only once. This results in a low blood flow rate value, which is safe and effective, and dialysis therapy will not be stopped even if the flow rate is not 0 mL / min. To explain more specifically, as follows... Figure 8 As shown, the blood flow control device 10 controls the blood flow rate by continuously performing a second set rotation amount (e.g., 10 times (10 scales)) or more within a preset time (e.g., within 0.1 seconds) on a rotation operation of a predetermined unit rotation amount in the rotation operation input unit 6, and by rotating the rotation operation input unit 6 in a direction that reduces the flow rate of blood delivered from the blood pump P, thereby reducing the flow rate of blood delivered from the blood pump P to a predetermined flow rate (e.g., 100 mL / min), and temporarily ignoring subsequent continuous inputs, wherein the second set rotation amount is greater than the first set rotation amount. Thus, by performing only one instantaneous rotation operation of the rotation operation input unit 6, the blood flow rate can be changed from 300 mL / min to 100 mL / min in a shorter time (0.1 seconds in this example).

[0067] The blood flow control device 10 according to the above embodiments can achieve the following effects.

[0068] In the above embodiment, the blood flow control device 10 is configured to control the flow rate of blood delivered from the blood pump P via the rotation operation of the rotation operation input unit 6, and is configured to control in the following manner: when the rotation operation of a predetermined unit rotation amount in the rotation operation input unit 6 is continuously performed up to a preset number of times (first preset rotation amount), the flow rate of blood delivered from the blood pump P is not changed; when the rotation operation of the predetermined unit rotation amount in the rotation operation input unit 6 is continuously performed beyond the preset number of times, the flow rate of blood delivered from the blood pump P is changed according to the number of times (rotation amount) the preset number of times has been exceeded. Therefore, when controlling the flow rate of blood delivered from the blood pump P via the rotation operation of the rotation operation input unit 6, erroneous operation of the rotation operation input unit 6 can be prevented, and the flow rate of blood can be changed in a short time in an emergency.

[0069] Furthermore, in this embodiment, the flow rate of blood delivered from the blood pump P can be changed according to the rotation direction of the rotation operation input unit 6. Therefore, misoperation of the rotation operation input unit 6 can be prevented in any rotation direction, and the flow rate of blood delivered from the blood pump P can be changed quickly in an emergency.

[0070] Furthermore, in this embodiment, if the rotation start / end determination unit 12 determines that the rotation operation of the rotation operation input unit 6 has ended after the completion of a rotation operation with a predetermined unit rotation amount in the rotation operation input unit 6 and there is no next rotation operation within a predetermined time, then the rotation operation of the rotation operation input unit 6 can be easily determined. Therefore, it is easy to determine whether the rotation operation of the rotation operation input unit 6 is continuous.

[0071] Furthermore, in this embodiment, when the blood flow control device 10 continuously performs a predetermined number of rotation operations with a specified unit rotation amount in the rotation operation input unit 6 more than a preset number of times, and the rotation operation input unit 6 rotates in a rotation direction that reduces the flow rate of blood delivered from the blood pump P, it controls the flow rate of blood delivered from the blood pump P to a predetermined flow rate. Therefore, in an emergency, the flow rate of blood delivered from the blood pump P can be reduced in a short time.

[0072] It should be noted that the present invention is not limited to the above embodiments, and modifications and improvements within the scope of achieving the purpose of the present invention are included in the present invention.

[0073] For example, in the aforementioned embodiment, when the rotation operation of the rotation input unit 6 is performed continuously for more than a preset number of times (the first preset rotation amount), a sound can also be emitted. This allows the operator to easily perceive a change in blood flow by emitting a sound. Furthermore, when the rotation operation of the rotation input unit 6 is performed continuously for more than a preset number of times, by temporarily changing the blood flow value and the color of the area surrounding the value (for example, for 0.1 to 1.0 seconds, or until it is determined that the rotation operation has disappeared within a predetermined time), the operator can more easily perceive the change in blood flow.

[0074] Furthermore, while the foregoing embodiments described the control of blood flow rates, this approach is not limited to this. It can also be applied to controlling the flow rates of saline or dialysate during pre-priming, fluid replacement, and the supply of supplemental fluid, such as... Figure 9As shown, the fluid flow control device can also control the flow rate by continuously rotating the rotary operation input unit 6 by a predetermined unit rotation amount for a preset time (e.g., within 0.1 seconds) at a third predetermined rotation amount larger than the first predetermined rotation amount (e.g., 10 times (10 scale divisions)), and by rotating the rotary operation input unit 6 in the direction that increases the flow rate of the fluid delivered from the flow adjustment unit, thereby increasing the flow rate of the fluid delivered from the flow adjustment unit to a predetermined flow rate (e.g., 250 mL / min). In this case, by rotating the rotary operation input unit 6 only once instantaneously, the flow rate of the fluid can be changed from 0 mL / min to 250 mL / min in a short time (0.1 seconds in this example). It should be noted that the control that increases the flow rate of saline or dialysate in a short time can also be applied to the control of blood flow rate.

[0075] Explanation of reference numerals in the attached figures

[0076] 1. Blood purification device (extracorporeal circulation device)

[0077] 6 Rotary Operation Input Section

[0078] 10. Blood flow control device (fluid flow control device)

[0079] P Blood Pump (Flow Adjustment Unit)

Claims

1. A fluid flow control device that controls the flow rate of fluid delivered from a flow adjustment unit by rotating a rotary operation input. The fluid flow control device controls the flow rate in the following manner: when a predetermined unit rotation operation is continuously performed in the rotation operation input section until a preset first rotation amount is reached, the flow rate value of the fluid delivered from the flow adjustment unit remains unchanged; when the predetermined unit rotation operation in the rotation operation input section is continuously performed until the first preset rotation amount is exceeded, the flow rate value of the fluid delivered from the flow adjustment unit is changed to a flow rate value corresponding to the rotation amount exceeding the first preset rotation amount. The fluid flow control device further controls the flow by performing a second predetermined rotation or more for a predetermined unit rotation amount continuously within a preset time period, and when the rotation operation input unit rotates in a rotation direction that reduces the flow rate of the fluid delivered from the flow adjustment unit, the flow rate of the fluid delivered from the flow adjustment unit is reduced to a predetermined flow rate, wherein the second predetermined rotation amount is greater than the first predetermined rotation amount, and after the flow rate of the fluid delivered from the flow adjustment unit is reduced to the predetermined flow rate, the continuous input of the rotation operation input unit is ignored and the flow rate of the fluid delivered from the flow adjustment unit is maintained at the predetermined flow rate.

2. The fluid flow control device as claimed in claim 1, wherein the flow rate value of the liquid delivered from the flow adjustment unit is controlled according to the rotation direction of the rotation operation of the rotation operation input unit.

3. The fluid flow control device as described in claim 1 or 2, wherein if there is no next rotation operation within a specified time after the rotation operation in the rotation operation input section ends, the rotation operation of the rotation operation input section is determined to be over.

4. The fluid flow control device as claimed in claim 1 or 2, wherein when the rotation operation of the predetermined unit rotation amount in the rotation operation input unit is continuously performed for a third predetermined rotation amount or more within a predetermined time, and the rotation operation input unit rotates in a rotation direction that increases the flow rate value of the fluid delivered from the flow adjustment unit, the device controls the flow rate value of the fluid delivered from the flow adjustment unit to increase to a predetermined flow rate value, wherein the third predetermined rotation amount is greater than the first predetermined rotation amount.

5. The fluid flow control device as claimed in claim 3, wherein when the rotation operation of the predetermined unit rotation amount in the rotation operation input unit is continuously performed for a third predetermined rotation amount or more within a predetermined time, and the rotation operation input unit rotates in a rotation direction that increases the flow rate value of the fluid delivered from the flow adjustment unit, the device controls the flow rate value of the fluid delivered from the flow adjustment unit to increase to a predetermined flow rate value, wherein the third predetermined rotation amount is greater than the first predetermined rotation amount.

6. An extracorporeal circulation device, which includes: Flow adjustment unit; A rotary operation input unit, configured to rotate mechanically, is capable of performing a rotary operation to change the flow rate value of the fluid delivered from the flow adjustment unit; and The fluid flow control device according to any one of claims 1 to 5 controls the flow rate of the fluid delivered from the flow adjustment unit by rotating the rotary operation input unit.

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