JP2022056263A - Liquid delivery system, infusion pump and control method - Google Patents

Abstract

To provide a liquid delivery system, infusion pump and control method capable of executing further appropriate control according to situations.SOLUTION: A liquid delivery system includes an intravenous drip detector for detecting droplets dripping inside a drip tube, an infusion pump attached to the infusion tube connected to the drip tube and controlling the delivery of infusion in the infusion tube, and an acceleration sensor provided at least at any of the intravenous drip detector or infusion pump and detecting an acceleration. The infusion pump executes monitoring control based on the droplets detected by the intravenous drip detector and stops the monitoring control when a value of the acceleration to be detected by the acceleration sensor reaches a first threshold or more.SELECTED DRAWING: Figure 3

Description

The present disclosure relates to a liquid delivery system, an infusion pump and a control method.

A liquid feeding system equipped with a drip tube is used to administer a liquid such as a nutritional supplement or a drug solution to a living body such as a patient. The liquid feeding system includes a drip tube, an infusion tube, various medical devices, and the like, and a route (infusion line) for transporting the liquid is formed by these. The infusion tube is equipped with a clamp or infusion pump for adjusting the flow rate of the liquid flowing through the infusion line.

A drip detection device for detecting a liquid falling inside a drip tube provided in the above-mentioned infusion device or the like is known (see, for example, Patent Document 1). Specifically, the drip detection device described in Patent Document 1 includes a light emitting element and a light receiving element arranged so that the optical axis is in a single plane, and when the droplet falls in the drip cylinder, the light receiving element is provided. The output voltage generated by the light receiving circuit including the above changes, so that droplets can be detected.

Japanese Unexamined Patent Publication No. 2017-20259

In the liquid feeding system, the liquid feeding by the infusion pump is controlled based on the detection result of the liquid by the drip detection device, or an abnormality is detected and an alarm is issued. The drip detector is used while attached to the drip tube, but when a patient receiving a drip using the drip system moves with the drip system or changes positions, the drip tube or The drip detector may shake. If the drip tube or drip detector shakes, it may be difficult for the drip detector to accurately detect the liquid, and as a result, the infusion pump may not be able to properly deliver the liquid or an erroneous alarm may be issued. be.

It is an object of the present disclosure to provide a liquid delivery system, an infusion pump and a control method capable of performing more appropriate control depending on the situation.

The liquid feeding system as the first aspect of the present disclosure is attached to a drip detection device for detecting droplets falling inside the drip tube and an infusion tube connected to the drip tube, and the infusion solution in the drip tube is attached. The infusion pump is provided with an infusion pump for controlling liquid delivery and an acceleration sensor provided in at least one of the infusion detection device or the infusion pump to detect acceleration, and the infusion pump is a liquid detected by the infusion detection device. The monitoring control based on the drop is executed, and when the value of the acceleration detected by the acceleration sensor becomes equal to or higher than the first threshold value, the monitoring control is stopped.

As one embodiment of the present disclosure, the monitoring control calculates the amount of the infusion liquid to be sent based on the amount of the droplet calculated from the droplet information regarding the droplet detected by the drip detection device. The dripping control for controlling the liquid feeding is included.

As one embodiment of the present disclosure, when the infusion pump stops the drip control, the droplet calculated from the droplet information about the droplet detected by the drip detection device immediately before the drip control is stopped. The liquid delivery is controlled based on the amount.

As one embodiment of the present disclosure, when the drip control is stopped, the infusion pump controls the infusion by calculating the amount of the infusion from the control state of the infusion mechanism of the infusion pump. Perform volume control.

As one embodiment of the present disclosure, the monitoring control includes an alarm issuing control that issues an alarm based on the droplet detected by the drip detecting device.

As one embodiment of the present disclosure, the infusion pump restarts the monitoring control when the value of the acceleration detected by the acceleration sensor becomes less than the second threshold value in the state where the monitoring control is stopped. do.

As one embodiment of the present disclosure, the infusion pump is in a state where the monitoring control is stopped and the state in which the value of the acceleration detected by the acceleration sensor is less than the second threshold value continues for a predetermined time. The monitoring control is restarted.

As one embodiment of the present disclosure, a notification unit for notifying information regarding the stop or restart of the monitoring control is further provided.

The infusion pump as the second aspect of the present disclosure is an infusion pump which is attached to an infusion tube connected to an infusion tube and controls the infusion of the infusion in the infusion tube, and drops inside the infusion tube. A control unit that executes monitoring control based on the droplet detected by the drip detection device for detecting the droplet is provided, and the control unit measures the acceleration provided in at least one of the drip detection device or the infusion pump. When the value of the acceleration detected by the detected acceleration sensor becomes equal to or higher than the first threshold value, the monitoring control is stopped.

The control method as the third aspect of the present disclosure is a control method executed by an infusion pump which is attached to an infusion tube connected to an infusion tube and controls the infusion of the infusion in the infusion tube. A step of executing monitoring control based on the droplet detected by the drip detection device that detects the droplet falling inside the drip detector, and detecting the acceleration provided in at least one of the drip detection device or the infusion pump. The step includes a step of stopping the monitoring control when the value of the acceleration detected by the acceleration sensor becomes equal to or higher than the first threshold value.

According to the liquid feeding system, infusion pump and control method of the present disclosure, more appropriate control can be performed depending on the situation.

It is a schematic diagram which shows the structure of the liquid feeding system which concerns on 1st Embodiment of this disclosure. It is a figure which shows the part of the liquid feeding system of FIG. 1 in an enlarged view, and is the front view which shows the drip detection device and a drip tube shown in FIG. It is a functional block diagram which shows the schematic structure of the drip detection device and the infusion pump of FIG. It is a flowchart which shows an example of the process executed by the control part of the infusion pump of FIG. It is a flowchart which shows an example of the process which the control part of the infusion pump of FIG. 3 executes in the monitoring control.

Hereinafter, the first embodiment of the present disclosure will be described with reference to the drawings. The same reference numerals are given to the common components in each figure. In the present specification, the vertical direction means the vertical direction when the drip tube 110, which will be described later, is used for a living body, and the upper direction is the direction in which the drip portion 111 is located when viewed from the discharge portion 112 (that is, in FIG. 2). Upper) and lower shall mean the opposite direction.

FIG. 1 is a schematic view showing the configuration of the liquid feeding system 100 according to the first embodiment of the present disclosure. FIG. 2 is an enlarged view showing a part of FIG. 1, and is a front view showing the drip detection device 1 and the drip tube 110.

The drip detection device 1 is a device that functions as a sensor that detects droplets falling inside the drip cylinder 110. As shown in FIG. 1, the drip detection device 1 of the present embodiment is used in a state of being mounted around the drip tube 110. As shown in FIG. 1, the drip tube 110 constitutes, for example, a part of the liquid feeding system 100.

The drip detection device 1 includes a light emitting unit 10 capable of irradiating light toward droplets of a chemical solution or the like falling inside the drip tube 110, and a light receiving unit 20 capable of receiving the light irradiated by the light emitting unit 10. More specifically, in the present embodiment, as shown in FIG. 2, the light emitting unit 10 is configured to be capable of irradiating the incident light L1 toward the falling droplets 116 such as the chemical liquid falling inside the drip tube 110. The light receiving unit 20 is configured to be able to receive the attenuated transmitted light L2 generated by the incident light L1 being absorbed and / or refracted by the droplet.

The liquid feeding system 100 shown in FIG. 1 is used to administer a liquid such as a nutritional supplement or a drug solution to a living body such as a patient. The liquid feeding system 100 includes an infusion line for transporting the liquid to the living body. Specifically, the liquid feeding system 100 includes an infusion container 101 such as an infusion bag containing a liquid, a drip tube 110 capable of visually recognizing the flow rate of the liquid supplied from the infusion container 101, and an indwelling placed in a living body. It includes a connector 102 that can be connected to a needle or the like, and a plurality of infusion tubes 103 that connect each of these members. The infusion line is formed by an infusion container 101, an infusion tube 110, a connector 102, and an infusion tube 103. The liquid delivery system 100 further includes a clamp 104 mounted on the liquid infusion tube 103 and a liquid infusion pump 2 for adjusting the flow rate of the liquid flowing through the infusion line.

As shown in FIG. 2, the drip tube 110 has a drip portion 111 that introduces the liquid transported from the upstream of the infusion line into the internal drip chamber 113, and discharges the liquid in the drip chamber 113 to the downstream of the infusion line. A discharge portion 112 and a peripheral wall portion 114 for partitioning the peripheral surface of the dropping chamber 113 are provided. The peripheral wall portion 114 includes at least a part of a light transmitting portion made of a light transmitting material. Specifically, the light transmitting portion of the peripheral wall portion 114 is provided at least at a position above the liquid level of the stored liquid 117 described later.

The liquid transported to the drip tube 110 falls from the droplet discharge port 111a of the dropping portion 111 as falling droplets 116, and is stored as a stored liquid 117 in the dropping chamber 113. The discharge unit 112 discharges a part of the stored liquid 117. As a result, the stored liquid 117 is kept in an appropriate amount.

The drip detection device 1 is used to detect the falling droplet 116 falling in the drip chamber 113 inside the drip cylinder 110. As shown in FIG. 2, the drip detection device 1 of the present embodiment sandwiches the peripheral wall portion 114 at the position of the light transmitting portion of the peripheral wall portion 114 of the drip cylinder 110 located above the liquid level of the stored liquid 117. It is installed in this way.

FIG. 3 is a functional block diagram showing a schematic configuration of the processing mechanism 3 of the liquid feeding system 100 of FIG. 1, and is a functional block diagram showing a schematic configuration of the drip detection device 1 and the infusion pump 2 of FIG.

The drip detection device 1 detects droplets falling inside the drip cylinder 110. As shown in FIG. 3, the drip detection device 1 of the present embodiment includes a light emitting unit 10, a light receiving unit 20, an amplification unit 30, a control unit 40, a storage unit 50, an acceleration sensor 60, and a communication unit 70. And.

The light emitting unit 10 can irradiate the incident light L1 toward the falling droplet 116 falling in the dropping chamber 113 of the drip tube 110 through the light transmitting portion of the peripheral wall portion 114. The light emitting unit 10 is composed of a light emitting element that emits light such as one or a plurality of LEDs (Light Emitting Diode) or LD (Laser Diode). In the present embodiment, it will be described below assuming that the light emitting unit 10 is composed of one LED.

The light receiving unit 20 can receive the light emitted by the light emitting unit 10. In the present embodiment, the light receiving unit 20 can receive the attenuated transmitted light L2 generated by the incident light L1 from the light emitting unit 10 being absorbed and / or refracted by the falling droplet 116. However, the light receiving unit 20 may detect the reflected light generated by the incident light L1 from the light emitting unit 10 being reflected by the falling droplet 116. The light receiving unit 20 is composed of, for example, a light receiving element such as one or a plurality of PTs (Photo Transistors) or PDs (Photo Diodes). In the present embodiment, it will be described below assuming that the light receiving unit 20 is composed of one PT. As shown in FIG. 2, in the drip detection device 1 of the present embodiment, the light emitting unit 10 and the light receiving unit 20 are located on the same plane.

The light receiving unit 20 outputs a light receiving signal based on the received light including the transmitted light L2 to the control unit 40 via the amplification unit 30. The signal amplified by the amplification unit 30 is hereinafter referred to as “amplification signal” in the present specification. The control unit 40 receives the amplification signal from the amplification unit 30.

The amplification unit 30 is composed of, for example, an amplifier circuit or the like, amplifies the light receiving signal from the light receiving unit 20, generates an amplified signal, and outputs the amplified signal to the control unit 40.

The control unit 40 controls and manages the entire drip detection device 1 including each functional unit of the drip detection device 1. The control unit 40 includes at least one processor. The control unit 40 is composed of a processor such as a CPU (Central Processing Unit) that executes a program defining a control procedure or a dedicated processor specialized in processing each function. Such a program is stored in a storage medium external to the storage unit 50 or the drip detection device 1.

The control unit 40 detects the falling droplet 116 based on the amplification signal received from the amplification unit 30.

The storage unit 50 can be composed of a semiconductor memory, a magnetic memory, or the like. The storage unit 50 stores, for example, various information, a program for operating the drip detection device 1, and the like. The storage unit 50 may also function as a work memory.

The acceleration sensor 60 detects the acceleration of the drip detection device 1. The acceleration sensor 60 outputs the detected acceleration value to the control unit 40. The value of the acceleration detected by the acceleration sensor 60 is used for determining the stop or execution switching process of the monitoring control described later. For example, when a patient receiving an infusion using the liquid feeding system 100 moves with the liquid feeding system 100 or when the body position is changed, the infusion detection device 1 shakes and the acceleration detected by the acceleration sensor 60 is reached. It is expected that the value will increase.

The drip detection device 1 may include an angular velocity sensor or an angle sensor together with the acceleration sensor 60 or in place of the acceleration sensor 60. In this case, the angular velocity of the drip detection device 1 detected by the angular velocity sensor or the angle of the drip detection device 1 detected by the angle sensor is used for determining the stop or execution switching process of the monitoring control described later.

The communication unit 70 transmits / receives various information by performing wired communication or wireless communication with the infusion pump 2. In the present embodiment, the communication unit 70 communicates with the infusion pump 2 via the communication cable 80, as schematically shown in FIGS. 1 and 3. In the present embodiment, the communication unit 70 transmits the information on the falling droplet 116 detected by the control unit 40 and the information on the value of the acceleration detected by the acceleration sensor 60 to the infusion pump 2.

The infusion pump 2 is attached to an infusion tube 103 connected to the drip tube 110. The infusion pump 2 controls the delivery of the infusion solution in the infusion tube 103. As shown in FIG. 3, the infusion pump 2 of the present embodiment includes a liquid feeding unit 120, a notification unit 130, a control unit 140, a storage unit 150, and a communication unit 170.

Under the control of the control unit 140, the liquid feeding unit 120 sends the infusion solution in the infusion tube 103 to the opposite side of the drip tube 110 (that is, the connector 102 side in FIG. 1). The liquid feeding unit 120 has, for example, a mechanism that can handle the infusion inside the infusion tube 103 and send the liquid to the downstream side. As such a mechanism, a conventionally known mechanism can be adopted. The liquid feeding unit 120 sends the infusion liquid to the connector 102 side by handling the infusion liquid in the amount determined by the control unit 140 by the mechanism.

The notification unit 130 notifies the user, the manager, or the like of the liquid feeding system 100 of the information. Specifically, the notification unit 130 notifies information regarding the stop or execution of the monitoring control described later. For example, the notification unit 130 may notify that the monitoring control has been stopped or the execution has been switched. Further, for example, the notification unit 130 may notify whether the monitoring control by the infusion pump 2 is stopped or executed. The notification unit 130 may be configured in any manner capable of transmitting information to the outside. For example, the notification unit 130 is composed of a light emitting element, and may output information to the outside depending on the light emitting color, the lighting state, the blinking state, and the like. Further, for example, the notification unit 130 is composed of a speaker, and may output information to the outside by a sound such as an alarm sound or a voice announcement. Further, for example, the notification unit 130 may be displayed by a display device such as a liquid crystal display (LCD), an organic EL display (OELD: Organic Electro-Luminescence Display), or an inorganic EL display (IELD: Inorganic Electro-Luminescence Display). It is configured and information may be output to the outside by various displays. The notification unit 130 may be configured by an embodiment other than the specific example shown here. Further, the notification unit 130 may be configured by combining a plurality of modes.

The control unit 140 controls and manages the entire infusion pump 2 including each functional unit of the infusion pump 2. The control unit 140 includes at least one processor. The control unit 140 is composed of a processor such as a CPU (Central Processing Unit) that executes a program defining a control procedure or a dedicated processor specialized in processing each function. Such a program is stored in a storage medium external to the storage unit 150 or the infusion pump 2.

The control unit 140 controls the amount of infusion liquid in the infusion tube 103 by controlling the mechanism of the liquid feeding unit 120.

Further, the control unit 140 controls the stop and execution switching processing of the monitoring control. Specifically, the control unit 140 controls the switching process based on the value of the acceleration detected by the acceleration sensor 60. More specifically, the control unit 140 stops the monitoring control when the value of the acceleration detected by the acceleration sensor 60 becomes equal to or higher than the first threshold value in the state where the monitoring control is being executed.

Further, the control unit 140 restarts (that is, executes) the monitoring control when the value of the acceleration detected by the acceleration sensor 60 becomes less than the second threshold value in the state where the monitoring control is stopped. When the monitoring control is restarted, the control unit 140 is in a state of executing the monitoring control.

The control unit 140 may restart the monitoring control when the state in which the value of the acceleration detected by the acceleration sensor 60 is less than the second threshold value continues for a predetermined time in the state where the monitoring control is stopped. The predetermined time can be, for example, a few seconds to a few minutes. In this case, the control unit 140 can restart the monitoring control when it becomes more certain that the acceleration value falls below the second threshold value. In the present embodiment, the control unit 140 restarts the monitoring control when the state in which the value of the acceleration detected by the acceleration sensor 60 is less than the second threshold value continues for a predetermined time in the state where the monitoring control is stopped. Will be described below.

Here, the first threshold value and the second threshold value, and the predetermined time in the state of being less than the second threshold value may be appropriately determined according to the specifications of the drip tube 110, the drip detection device 1, and the like. Further, the first threshold value and the second threshold value may be the same or different. In the present embodiment, the first threshold value and the second threshold value will be described below as having the same threshold value. Therefore, in the present specification, hereinafter, the first threshold value and the second threshold value are collectively referred to as a "threshold value".

Here, the monitoring control is a control based on the droplet detected by the drip detection device 1. The monitoring control may include a drip control of the infusion pump 2. The dripping control is based on the amount of droplets calculated from information on the droplets (hereinafter, simply referred to as "droplet information") such as the number of droplets, the dripping frequency, and the characteristics of the chemical solution in the droplets detected by the drip detection device 1. Based on this, it is a control method that controls the liquid feed amount by the liquid feed unit 120 by calculating the liquid feed amount of the infusion solution. That is, when the dropping control is executed, the control unit 140 calculates the droplet amount of the falling droplet 116 based on the information of the falling droplet 116 received from the drip detection device 1. The calculation of the droplet amount may be performed using any known method. The control unit 140 may determine the calculated droplet amount as the liquid feed amount by the infusion pump 2. The control unit 140 may calculate, for example, the amount of droplets at predetermined time intervals, or may calculate the total amount of droplets after the liquid feeding by the liquid feeding system 100 is started. Then, the control unit 140 reduces the liquid feed amount when the calculated liquid feed amount is larger than the target amount, and increases the liquid feed amount when the calculated liquid feed amount is smaller than the target amount. Therefore, control is performed so that the liquid feed amount approaches the target amount and the deviation from the target amount is small.

The monitoring control may include alarm issuance control by the infusion pump 2. The alarm issuance control is a control for issuing an alarm when the control unit 140 determines that an abnormality has occurred based on the droplet detected by the drip detection device 1. For example, the control unit 140 may detect droplets by the drip detection device 1 even though the liquid feed is not controlled, or the drip detection device may control the liquid feed. If the droplet is not detected by 1, it may be determined that an abnormality has occurred and an alarm may be issued. Further, when the infusion amount calculated based on the droplet amount calculated from the droplet information detected by the drip detection device 1 is larger or smaller than the target amount by the control unit 140. In addition, it may be determined that an abnormality has occurred and an alarm may be issued. The control unit 140 may issue an alarm by, for example, performing a notification from the notification unit 130. The control unit 140 may communicate with an external device via the communication unit 170, transmit a signal notifying that an abnormality has occurred to the external device, and cause the external device to issue an alarm. .. Such an external device may be installed, for example, in a place where a medical worker resides. As a result, the medical staff can know that the abnormality has occurred even if he / she is not at the place where the liquid feeding system 100 is installed.

The storage unit 150 can be configured as a semiconductor memory, a magnetic memory, or the like. The storage unit 150 stores, for example, various information, a program for operating the infusion pump 2, and the like. The storage unit 150 may also function as a work memory.

The communication unit 170 transmits / receives various information by performing wired communication or wireless communication with the drip detection device 1. In the present embodiment, the communication unit 170 communicates with the drip detection device 1 via the communication cable 80, as schematically shown in FIGS. 1 and 3. In the present embodiment, the communication unit 170 receives information on the falling droplet 116 detected by the control unit 40 and information on the value of the acceleration detected by the acceleration sensor 60 from the drip detection device 1.

Next, the process executed by the control unit 140 of the infusion pump 2 will be described with reference to FIG. FIG. 4 is a flowchart showing an example of a process executed by the control unit 140 of the infusion pump 2. FIG. 4 is a flow of processing executed when infusion (liquid feeding) is performed to a patient using the liquid feeding system 100. At the start of FIG. 4, the infusion pump 2 is in a state of executing the above-mentioned monitoring control. In the present embodiment, the infusion pump 2 will be described as executing both drip control and alarm issuance control as monitoring control. However, the infusion pump 2 may execute only one of the drip control and the alarm issuance control as the monitoring control.

Through the flow of FIG. 4, the infusion pump 2 continuously receives information on the falling droplet 116 and information on the acceleration value from the drip detection device 1. Then, the infusion pump 2 calculates the droplet amount of the falling droplet 116 based on the information (that is, the droplet information) of the falling droplet 116 detected by the drip detection device 1. As a result, the infusion pump 2 continues to calculate the liquid feed amount.

In the flow shown in FIG. 4, first, the control unit 140 determines whether or not the value of the acceleration received from the drip detection device 1 is equal to or greater than the threshold value (step S101).

When the control unit 140 determines that the value of the acceleration received from the drip detection device 1 is less than the threshold value (No in step S101), the acceleration is periodically or irregularly while the monitoring control is being executed. The value is received from the drip detection device 1, and step S101 is repeated.

When the control unit 140 determines that the value of the acceleration received from the drip detection device 1 is equal to or greater than the threshold value (Yes in step S101), the control unit 140 stops the monitoring control (step S102). Therefore, the control unit 140 does not execute the dropping control and the alarm issuing control until the monitoring control is restarted next time.

In the present embodiment, when the monitoring control is stopped in step S102, the control unit 140 starts executing the volume control (step S103). The volume control is a control method for controlling the liquid feeding by calculating the liquid feeding amount of the infusion liquid from the control information of the liquid feeding mechanism of the infusion pump 2. That is, the volume control is used as a control method instead of the drip control in the state where the monitoring control is stopped. In the volume control, the control unit 140 calculates the infusion volume from the drive amount of the infusion pump 2 based on the inner diameter of the infusion tube 103, and controls the infusion volume so that the deviation from the target amount is small. Run. Specific volume control may be performed using any known method.

Further, when the monitoring control is stopped in step S102, the control unit 140 notifies the information regarding the stop of the monitoring control from the notification unit 130 (step S104). Specifically, the control unit 140 may notify that the process of switching from the state in which the monitoring control is executed to the state in which the monitoring control is stopped (switching process) has been performed. The notification of the switching process may include content indicating that the execution of the volume control has started.

Then, the control unit 140 determines whether or not the value of the acceleration received from the drip detection device 1 is less than the threshold value while executing the volume control (step S105).

When the control unit 140 determines that the value of the acceleration received from the drip detection device 1 is equal to or higher than the threshold value (No in step S105), the control unit 140 periodically or irregularly adjusts the acceleration while the volume control is being executed. The value is received from the drip detection device 1, and step S105 is repeated.

When the control unit 140 determines that the acceleration value received from the drip detection device 1 is less than the threshold value (Yes in step S105), a predetermined time has elapsed since the control unit 140 determines that the acceleration value is less than the threshold value. It is determined whether or not it has been done (step S106).

If the control unit 140 determines that the acceleration value is less than the threshold value and then determines that the predetermined time has not elapsed (No in step S106), the process proceeds to step S105 and the acceleration value is less than the threshold value. It is determined whether or not it is. In this case, after shifting to step S105, it is determined in step S105 that the acceleration value is not less than the threshold value (No in step S105), and then in step S105 it is determined that the acceleration value is less than the threshold value (No). Yes) in step S105, when the process proceeds to step S106, the control unit 140 may determine whether or not a predetermined time has elapsed after newly determining that the acceleration value is less than the threshold value. That is, when it is determined in step S105 that the value of the acceleration is not less than the threshold value (No in step S105), the measurement at the predetermined time in step S106 may be reset and the measurement may be started again from 0.

When the control unit 140 determines that a predetermined time has elapsed after determining that the acceleration value is less than the threshold value (Yes in step S106), the control unit 140 executes (resumes) monitoring control (step S107). In this way, the monitoring control including the dropping control and the alarm issuing control is executed again.

When the monitoring control is restarted in step S107, the control unit 140 stops executing the volume control (step S108).

Further, when the monitoring control is restarted in step S107, the control unit 140 notifies the information regarding the execution (restart) of the monitoring control from the notification unit 130 (step S109). Specifically, the control unit 140 may notify that a process (switching process) for switching from a state in which monitoring control is stopped to a state in which monitoring control is executed has been performed. The notification of the switching process may include a content indicating that the execution of the volume control has been stopped.

FIG. 5 is a flowchart showing an example of a process executed by the control unit 140 of the infusion pump 2 in the monitoring control. That is, FIG. 5 is a flow executed when the monitoring control is restarted at the start time of the flow shown in FIG. 4 or in step S107. The control unit 140 repeatedly executes the flow of FIG. 5 in a state where the monitoring control is executed. As described above, in the present embodiment, the infusion pump 2 executes both drip control and alarm issuance control as monitoring control.

First, the control unit 140 acquires the information of the dropped droplet 116 from the drip detection device 1 (step S201).

The control unit 140 calculates the amount of drip droplets based on the information (that is, droplet information) of the falling droplet 116 acquired in step S201 (step S202). In the dropping control, the calculated droplet amount is treated as corresponding to the liquid feeding amount.

The control unit 140 determines whether or not an abnormality has occurred in the liquid feeding system 100 based on the droplet amount calculated in step S202 as an alarm issuance control (step S203).

When the control unit 140 determines that an abnormality has occurred in the liquid feeding system 100 (Yes in step S203), the control unit 140 issues an alarm (step S204). Thereby, for example, the medical worker who recognizes the alarm can know that the liquid feeding system 100 has an abnormality.

On the other hand, when it is determined that no abnormality has occurred in the liquid feeding system 100 (No in step S203), the control unit 140 controls the liquid feeding amount calculated in step S202 so as to approach the target amount as the dropping control. (Step S205). The target amount may be stored in, for example, the storage unit 150.

As described above, according to the liquid feeding system 100 according to the present embodiment, the infusion pump 2 is a monitoring control including a dropping control or an alarm issuing control when the value of the acceleration detected by the acceleration sensor 60 is less than the threshold value. Is executed, and when the acceleration value is equal to or greater than the threshold value, the monitoring control is stopped. Therefore, when the shaking of the liquid feeding system 100 (in particular, the drip detection device 1 in this embodiment) is less than a predetermined amount, the infusion pump 2 executes monitoring control based on the droplets detected by the drip detection device 1. When the shaking of the liquid feeding system 100 is equal to or more than a predetermined amount, the monitoring control is stopped. In this way, when it is difficult for the drip detection device 1 to accurately detect the falling droplet 116, the control using the detection result of the falling droplet 116 is stopped, so that erroneous control is performed based on the inaccurate detection result. It can be prevented. Therefore, according to the liquid feeding system 100, more appropriate control can be executed depending on the situation.

For example, when the drip control is executed in the monitoring control as in the present embodiment, in a situation where it is difficult for the drip detection device 1 to accurately detect the fallen droplet 116, the drip control is stopped to send an erroneous liquid. It becomes easier to prevent the execution of liquid feeding by the amount. This makes it easier to prevent medical accidents in which the amount of infusion liquid sent deviates from the target amount.

Further, according to the liquid feeding system 100 according to the present embodiment, the volume control is executed when the dropping control is stopped. Therefore, even if the drip control is not executed, the liquid feed amount is controlled by an alternative means, and appropriate drip infusion that does not deviate from the target amount is continued.

Further, when the alarm issuance control is executed in the monitoring control, in a situation where it is difficult for the drip detection device 1 to accurately detect the falling droplet 116, the alarm issuance control is stopped to give an alarm when no abnormality has occurred. It becomes easier to prevent false alarms, such as when an alarm is issued or an alarm is not issued when an abnormality occurs. As a result, the burden on the medical staff to respond by false alarm can be reduced, and at the same time, the discomfort and anxiety of the patient can be eliminated.

Further, the liquid feeding system 100 according to the present embodiment restarts the monitoring control when the acceleration value becomes less than the threshold value, so that the detection accuracy of the dropped droplet 116 by the drip detection device 1 is guaranteed to be more than a predetermined value. If so, the monitoring control can be restarted automatically. As a result, it is possible to omit a series of operations in which the medical worker confirms the content of the alarm when the alarm is issued and restarts the liquid feeding if there is no problem. Therefore, it is possible to improve the QOL (Quality of Life) of the patient by achieving both the prevention of medical accidents and the reduction of the burden on the medical staff.

In the first embodiment, it has been described that when the monitoring control (drop control) is stopped in step S102, the volume control is executed in step S103. However, the control unit 140 of the infusion pump 2 does not necessarily have to execute the volume control when the drip control is stopped. When the drip control is stopped, the control unit 140 may control the infusion solution by another method.

For example, as the second embodiment, when the dropping control is stopped, the control unit 140 in the first embodiment is calculated from the droplet information detected by the drip detecting device 1 immediately before the dropping control is stopped. Liquid delivery may be controlled based on the volume. That is, when the dropping control is stopped, the control unit 140 may continue the liquid feeding control with the same liquid feeding amount as the control immediately before stopping the dropping control. It is assumed that the liquid feed control was properly executed until the drip control was stopped. Therefore, in a situation where it is difficult for the drip detection device 1 to accurately detect the fallen droplet 116, the control immediately before the drip control can be continued. , Appropriate infusion that does not deviate from the target amount is continued.

Further, in the first embodiment, it has been described that the drip detection device 1 includes the acceleration sensor 60, but the acceleration sensor 60 does not necessarily have to be provided in the drip detection device 1. The acceleration sensor 60 may be provided at an arbitrary position where it can be determined whether or not the drip detection device 1 can appropriately detect the falling droplet 116. For example, the acceleration sensor 60 may be independently provided at a position where it can be determined whether or not the liquid feeding system 100 is shaken.

For example, as the third embodiment, the acceleration sensor 60 in the first embodiment may be provided in the infusion pump 2. At this time, the acceleration sensor 60 determines the movement of the liquid feeding system 100, and if the value of the acceleration detected by the acceleration sensor 60 is equal to or greater than the threshold value, the monitoring control is stopped assuming emergency transportation of the patient. This makes it possible to prioritize treatment and transportation by stopping the issuance of alarms and continuing appropriate infusion.

As the fourth embodiment, the acceleration sensor 60 in the first embodiment may be provided in both the drip detection device 1 and the infusion pump 2. When the acceleration sensors are provided on both sides, the control unit 140 may determine to stop or execute the monitoring control based on the value of the acceleration detected by both sides. That is, when both acceleration sensors detect accelerations above a certain level, it can be determined that the liquid feeding system 100 is moving quietly. At this time, it is determined to stop the monitoring control including the alarm issuance control according to the flow of FIG.

On the other hand, when only the acceleration sensor of the drip detection device 1 detects the acceleration above a certain level, for example, the drip detection device 1 is in a state of receiving care in the ward or vibration due to wind, and the liquid feeding system 100 moves. It is judged that it is not. In this case, the infusion pump 2 stops the monitoring control including the alarm issuance control through the flow of FIG. 4 as in the first embodiment, but when the acceleration is detected for a certain period of time or more, only the alarm issuance control may be restarted. .. The infusion pump 2 may continuously execute only the alarm issuance control in step S102 of FIG. The infusion pump 2 may notify the shaking of the drip detection device 1 by a method different from the alarm issuance control. This makes it possible to determine the abnormal state of the drip detection device 1 in the ward. That is, in the fourth embodiment, in addition to the effect of the first embodiment, the presence or absence of movement of the liquid feeding system 100 is determined, so that the shaking due to the movement of the patient is not issued as an alarm, and the abnormal state in the ward is not issued. It also has the effect of reducing oversight. As a result, the state of the liquid feeding system 100 can be detected in more detail by the combination of the detections of both acceleration sensors, and the liquid feeding system 100 can be controlled more accurately.

When the acceleration sensor 60 is provided on both the drip detection device 1 and the infusion pump 2, the control unit 140 detects the acceleration detected by the acceleration sensor 60 of either the drip detection device 1 or the infusion pump 2. It may be determined that the monitoring control is stopped or executed by preferentially using the value of. In this case, while giving priority to the value of one acceleration, even if one of the acceleration sensors 60 fails and the acceleration value cannot be obtained, the other acceleration sensor 60 is used to continue the acceleration value. Can be obtained.

Further, in the first embodiment, the control unit 140 stops the monitoring control when the acceleration value detected by the acceleration sensor 60 becomes equal to or more than the first threshold value, and the acceleration value becomes less than the second threshold value. It was explained that the monitoring control will be resumed when it becomes. However, the control unit 140 may set another threshold value and execute the process based on the other threshold value. For example, the control unit 140 may be configured to perform different processes depending on the stage of the value of the acceleration detected by the acceleration sensor 60.

Further, in the first embodiment, it has been described that the control unit 140 of the infusion pump 2 executes the processing of the flow shown in FIG. However, the flow shown in FIG. 4 does not necessarily have to be executed by the control unit 140 of the infusion pump 2. The flow shown in FIG. 4 may be performed, for example, by another external device communicatively connected to the infusion pump 2. In this case, the infusion pump 2 executes the stop or restart of the monitoring control based on the command signal acquired from the other external device.

Further, in the above embodiment, it has been described that the control unit 140 of the infusion pump 2 calculates the droplet amount of the falling droplet 116 based on the information of the falling droplet 116. However, the calculation of the droplet amount of the falling droplet 116 may be performed by, for example, the drip detection device 1. In this case, the infusion pump 2 acquires the calculated information regarding the droplet amount from the drip detection device 1 and executes the control.

The liquid feed system, infusion pump, and control method according to the present disclosure are not limited to the specific configurations and processes shown in the above-described embodiments, and can be variously modified and changed as long as they do not deviate from the description of the claims. be.

The present disclosure relates to a liquid delivery system, an infusion pump and a control method.

1: Drip detection device 2: Infusion pump 3: Processing mechanism 10: Light emitting unit 20: Light receiving unit 30: Amplification unit 40, 140: Control unit 50, 150: Storage unit 60: Acceleration sensor 70, 170: Communication unit 80: Communication Cable 100: Liquid feeding system 101: Infusion container 102: Connector 103: Infusion tube 104: Clamp 110: Intravenous tube 111: Drop part 111a: Droplet discharge port 112: Discharge part 113: Drop chamber 114: Peripheral wall part 116: Drop liquid Drop 117: Reservoir liquid 120: Liquid feeding unit 130: Notification unit

Claims (10)

A drip detector that detects droplets falling inside the drip tube, and a drip detector.
An infusion pump that is attached to an infusion tube connected to the drip tube and controls the infusion of the infusion in the infusion tube.
An acceleration sensor provided in at least one of the drip detection device or the infusion pump to detect acceleration, and an acceleration sensor.
Equipped with
The infusion pump is
The monitoring control based on the droplet detected by the drip detection device is executed, and the monitoring control is executed.
When the value of the acceleration detected by the acceleration sensor becomes equal to or higher than the first threshold value, the monitoring control is stopped.
Liquid delivery system. The monitoring control is a dropping control that controls the feeding by calculating the feeding amount of the infusion liquid based on the droplet amount calculated from the droplet information about the droplet detected by the drip detecting device. The liquid feeding system according to claim 1. When the drip control is stopped, the infusion pump delivers the liquid based on the droplet amount calculated from the droplet information about the droplet detected by the drip detection device immediately before the drip control is stopped. The liquid feeding system according to claim 2, which is controlled. 2. The infusion pump executes volume control for controlling the infusion by calculating the infusion amount of the infusion from the control state of the infusion mechanism of the infusion pump when the drip control is stopped. Liquid transfer system described in. The liquid feeding system according to any one of claims 1 to 4, wherein the monitoring control includes an alarm issuing control that issues an alarm based on the droplet detected by the drip detecting device. Any of claims 1 to 5, wherein the infusion pump restarts the monitoring control when the value of the acceleration detected by the acceleration sensor becomes less than the second threshold value in the state where the monitoring control is stopped. The liquid feeding system described in item 1. The infusion pump resumes the monitoring control when the state in which the value of the acceleration detected by the acceleration sensor is less than the second threshold value continues for a predetermined time in the state where the monitoring control is stopped. The liquid feeding system according to any one of 1 to 5. The liquid feeding system according to any one of claims 1 to 7, further comprising a notification unit for notifying information regarding the stop or restart of the monitoring control. An infusion pump that is attached to an infusion tube connected to an infusion tube and controls infusion in the infusion tube.
It is provided with a control unit that executes monitoring control based on the droplets detected by the drip detection device that detects the droplets falling inside the drip cylinder.
The control unit monitors the acceleration when the value of the acceleration detected by the acceleration sensor for detecting the acceleration, which is provided in at least one of the drip detection device or the infusion pump, becomes equal to or higher than the first threshold value. Stop control,
Infusion pump. It is a control method executed by an infusion pump that is attached to an infusion tube connected to an infusion tube and controls infusion in the infusion tube.
A step of executing monitoring control based on the droplet detected by the drip detection device that detects the droplet falling inside the drip tube, and
A step of stopping the monitoring control when the value of the acceleration detected by the acceleration sensor for detecting the acceleration becomes equal to or higher than the first threshold value provided in at least one of the drip detection device or the infusion pump. When,
Control methods, including.

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