JP6981341B2 - Flow monitoring device, infusion device and abnormality notification method - Google Patents

Description

The present invention relates to a flow rate monitoring device used for an infusion device, an infusion device using the flow rate monitoring device, and an abnormality notification method for the flow rate monitoring device.

In the medical field, an infusion device equipped with a pump is used when it is necessary to accurately deliver a liquid such as a drug, a nutritional supplement, or blood to a patient at a predetermined speed and amount.
When an infusion is given to a patient, an infusion stand is used to place an infusion device or infusion bag. The infusion device is fixedly placed in the middle of the infusion stand, the infusion bag is suspended above the infusion stand, and the drip tube is placed between the infusion device and the infusion bag via a tube. In addition, a drip sensor is attached to the drip tube to monitor the flow rate abnormality.

In the infusion device of the drip number control type, the droplets falling in the drip cylinder are measured by the drip sensor, and the amount of liquid sent by the pump is controlled so that the number of droplets per unit time becomes a predetermined value. The infusion device determines that the amount of liquid to be sent is abnormal when the number of droplets per unit time measured by the drip sensor exceeds or falls below the number of droplets predetermined for the infusion device. Then, it has a function of issuing an alarm for abnormal flow rate and stopping the liquid feeding (see Patent Document 1). When an alarm is issued, a medical worker (operator) such as a nurse corrects the abnormality and confirms safety, and then restarts the liquid feeding.

Japanese Unexamined Patent Publication No. 2013-52284

By the way, since the infusion using the infusion device is often performed for a long time, the patient may push and move the infusion stand to go to the toilet or the examination room.
When the patient is moving in this way, the shaking or impact of the infusion stand temporarily causes fluctuations in the liquid level inside the drip tube, bounce of the droplets, and irregular dripping, and the actual flow rate. Even though no abnormality has occurred, the number of droplets measured by the drip sensor exceeds the specified amount, an alarm is issued, and the liquid supply to the patient is stopped. In addition, the operator needs to confirm the abnormal state of the infusion device and perform the work of restarting the infusion.

Therefore, an object of the present invention is to provide a flow rate monitoring device, an infusion device, and an abnormality notification method capable of reducing the occurrence of false notification of flow rate abnormality when a patient moves.

The present invention is a flow rate monitoring device used in an infusion device, and has a drop sensor unit for detecting droplets falling in a drip cylinder, an acceleration sensor unit for detecting a moving state of the drip cylinder, and an abnormality notification. The notification unit is provided with a notification unit, and a control unit that controls the notification unit based on the number of droplets detected by the drop sensor unit and the acceleration information detected by the acceleration sensor unit. Based on the acceleration information, it is determined whether the drip tube is stationary or moving, and when the number of droplets per unit time exceeds a predetermined threshold, it is determined that there is a flow abnormality and the notification is given. The present invention relates to a flow rate monitoring device that operates a unit and uses a first threshold value as a predetermined threshold value when stationary and a second threshold value larger than the first threshold value while moving.

Further, it is preferable that the control unit determines that there is an abnormality when the moving state continues for a predetermined time and operates the notification unit.

Further, it is preferable that the clamp portion provided in the tube connected to the drip tube is further provided, and the control unit operates the clamp portion when it is determined that there is an abnormality.

The present invention also relates to an infusion device including the flow rate monitoring device and a pump unit that presses a tube connected to the downstream side of the drip tube to send liquid.

Further, the present invention includes a drip sensor unit that detects droplets falling in the drip cylinder, an acceleration sensor unit that detects the acceleration applied to the drip cylinder, and a notification unit that notifies an abnormality, which is used in an infusion device. An abnormality notification method in a flow rate monitoring device including a control unit that controls the notification unit based on the number of droplets detected by the drop sensor unit and the acceleration information detected by the acceleration sensor unit. , The step of determining whether the drip tube is stationary or moving from the acceleration information, and the notification of determining that there is a flow abnormality when the number of droplets per unit time exceeds a predetermined threshold. An abnormality of the flow rate monitoring device, which comprises a step of operating the unit, and uses the first threshold value as the predetermined threshold value when stationary and a second threshold value larger than the first threshold value when moving. Regarding the notification method.

Further, a step of determining whether or not the moving state of the drip tube continues for a predetermined time, and a step of activating the notification unit when the moving state of the drip tube continues for a predetermined time are abnormal. It is preferable to include a step of notifying the above.

According to the present invention, the occurrence of false alarm can be reduced by detecting the moving state of the drip tube by the acceleration sensor unit and using the threshold value of the flow rate abnormality according to the moving state.

It is a figure which shows the use state of the flow rate monitoring apparatus and the infusion apparatus of this invention. It is a block diagram of the flow rate monitoring device and the infusion device of this invention. It is a block diagram of the flow rate monitoring device and the infusion device which concerns on modification 1 of this invention. It is a block diagram of the flow rate monitoring device and the infusion device which concerns on modification 2 of this invention. It is a figure which shows the flowchart of the abnormality notification method in the flow rate monitoring apparatus of this invention.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 5.

<Embodiment>
FIG. 1 shows a state in which the flow rate monitoring device 1 and the infusion device 100 of the present invention are arranged on the infusion stand 1000 and the infusion set 200 is attached. The flow rate monitoring device 1 is for monitoring the administration status of the drug solution when the liquid such as the drug solution or the nutritional supplement is accurately administered to the patient at a predetermined speed and amount, and is used together with the infusion set 200. Further, the infusion device 100 of the present embodiment controls the amount of liquid to be sent by the method of controlling the number of drops.

Before explaining the structure of the flow rate monitoring device 1 and the infusion device 100 of the present embodiment, the infusion set 200 will be described.

The infusion set 200 includes a drip tube 210, an infusion bag 220 containing the infusion solution, an upstream tube 231 extending from the infusion bag 220 to the drip tube 210, and a downstream tube 232 extending from the drip tube 210 to the puncture needle 240. To prepare for. In this infusion set 200, the flow rate monitoring device 1 is attached to the drip tube 210, and the infusion pump 110 is provided in the middle of the downstream tube 232.

The drip tube 210 is made of a transparent member such as polypropylene. According to this drip tube 210, a droplet grows at the upper part inside the drip tube 210, and when the droplet reaches a predetermined size, it falls downward and collects at the lower part of the drip tube 210 and accumulates. The infusion is given to the patient.
The infusion bag 220 is made of a transparent and flexible member such as polyethylene. The infusion bag 220 contains, for example, a liquid such as physiological saline, glucose solution, or blood.
The upstream tube 231 and the downstream tube 232 are made of transparent and flexible members such as polyvinyl chloride.

Next, the structures of the flow rate monitoring device 1 and the infusion device 100 will be described.
The infusion device 100 includes a flow rate monitoring device 1 and an infusion pump 110. The infusion device 100 is fixedly arranged on the gantry 1100 provided in the infusion stand 1000.

First, the flow rate monitoring device 1 included in the infusion device 100 will be described.
As shown in the block diagram of FIG. 2, the flow rate monitoring device 1 includes a sensor-side housing 10, a drop sensor unit 20, an acceleration sensor unit 30, a notification unit 40, and a sensor-side control unit 50. ..

The sensor-side housing 10 has a substantially rectangular parallelepiped shape, and has a holding portion in the center thereof that can hold the drip tube 210 by sandwiching it.

The drip sensor unit 20 is provided in the sensor-side housing 10, and includes a light projecting element and a light receiving element (not shown) arranged so as to face each other so as to sandwich the drip tube 210. When the droplet falls in the drip tube 210, the light projected from the light projecting element is blocked by the droplet and the output signal of the light receiving element changes, so that the drop of the droplet is detected. The light projecting element can be composed of, for example, a light emitting element such as an LED.

The acceleration sensor unit 30 detects the moving state of the drip cylinder 210, and the acceleration sensor unit 30 uses any method as long as it can detect whether the drip cylinder 210 is stationary or moving. It may be used, and a conventionally known electrostatic capacity detection method or piezo resistance type acceleration sensor can be used.
Further, the acceleration sensor unit 30 may be attached to either the sensor-side housing 10 or the infusion pump 110 as long as the moving state of the drip tube 210, that is, the infusion stand 1000 can be detected. In the present embodiment, the acceleration sensor unit 30 is attached to the sensor-side housing 10 to obtain acceleration information of the drip tube 210. It should be noted that whether or not the moving state of the drip tube 210 is detected by the acceleration sensor unit 30 may be arbitrarily set as to whether or not the function is enabled or disabled.

The notification unit 40 is for notifying the medical staff (operator) of the abnormal state when there is an abnormality in the infusion solution, and is composed of an alarm device that sounds an alarm sound and a display unit that displays the abnormal state. .. Further, the notification unit 40 may be attached to either the sensor-side housing 10 or the infusion pump 110, and in the present embodiment, the notification unit 40 is attached to the sensor-side housing 10.

The sensor-side control unit 50 is provided in the sensor-side housing 10. The sensor-side control unit 50 is composed of, for example, a central processing unit, a computer device including a RAM, a ROM, and the like. The sensor-side control unit 50 controls the notification unit 40 based on the number of droplets detected by the drop sensor unit 20 and the acceleration information detected by the acceleration sensor unit 30. Specifically, the sensor-side control unit 50 causes a flow rate when the number of droplets per unit time is below a preset lower threshold value or exceeds a preset predetermined upper threshold value. It is determined that there is an abnormality, and the notification unit 40 is activated to issue a warning. Further, a signal of abnormal flow rate is transmitted to the infusion device 1.

When the drip tube 210 is determined to be stationary based on the acceleration information detected by the acceleration sensor unit 30, the sensor-side control unit 50 uses a first threshold value preset as the above-mentioned upper threshold value. When it is determined that the drip tube 210 is moving, a second threshold set in advance is used as the above-mentioned upper threshold.
Here, when the drip tube 210 is moved while being suspended from the infusion stand 1000, the liquid level in the drip tube 210 fluctuates, the droplets bounce off, and irregular drops are temporarily caused by shaking or impact. appear. Therefore, the number of drops per unit time by the drop sensor unit 20 tends to be higher than the number of drops per unit time in a stationary state. However, in reality, since the flow rate does not increase in most cases, it is not appropriate to use the first threshold value as the above-mentioned upper limit threshold value. Therefore, in the present embodiment, a second threshold value larger than the first threshold value is used as the above-mentioned upper limit threshold value. More specifically, as the second threshold value, the number of drops that is twice the amount of the first threshold value can be used.

The timing of determining the moving state (whether stationary or moving) is performed every time a predetermined time elapses from the start of liquid feeding (S1). For example, in the pump unit 130 described later, the operation may be performed every time the motor rotates a predetermined number of times.

Next, the infusion pump 110 included in the infusion device 100 will be described. The infusion pump 110 includes a pump-side control unit 120, a pump unit 130, and a clamp unit 140.

The pump-side control unit 120, the pump unit 130, and the clamp unit 140 are housed in a housing (not shown) having a lid that can be opened and closed. On one surface (front surface) of the infusion pump 110, various operation buttons, a display unit for displaying setting contents and a flow rate, and the like are provided.

Like the sensor-side control unit 50, the pump-side control unit 120 is composed of a computer device including a central processing unit, RAM, ROM, and the like. The pump side control unit 120 is connected to the sensor side control unit 50 via the signal line SL, and information on the number of drops detected by the drop sensor unit 20 from the sensor side control unit 50 and the acceleration sensor unit 30. Acquires the detected acceleration information. The pump side control unit 120 controls the pump unit 130 and the clamp unit 140 based on this information.

The pump unit 130 presses the downstream tube 232 to feed the liquid. As the pump unit 130, a well-known finger pump type pump can be used. The pump unit 130 is controlled by the pump side control unit 120 so that the number of droplets per unit time detected by the drop sensor unit 20 of the flow rate monitoring device 1 becomes a set predetermined value (dropping). Number control method).

The clamp portion 140 is an electric clamp, and is provided on the upstream side of the downstream side tube 232 with respect to the pump portion 130. The clamp unit 140 is controlled by the pump side control unit 120 to open and close the downstream tube 232.

In the present embodiment, as shown in FIG. 2, the drip sensor unit 20, the acceleration sensor unit 30, the notification unit 40, and the sensor-side control unit 50 for controlling these are provided in the sensor-side housing 10 of the flow rate monitoring device 1. Since the configuration is provided, the flow rate monitoring device 1 and the infusion device 100 can be independently configured.

Further, as a modification 1 of the present embodiment, as shown in FIG. 3, the drip sensor unit 20, the acceleration sensor unit 30, the notification unit 40, the clamp unit 140, and the sensor side for controlling these are provided in the flow rate monitoring device 1. The control unit 50 may be provided in the sensor-side housing 10. As a result, the flow rate monitoring device 1 and the infusion device 100 can be independently configured, and the opening and closing of the downstream tube 232 can be controlled only by the configuration of the flow rate monitoring device 1 regardless of the operating state of the infusion device 100. Can be done.

Further, as a modification 2 of the present embodiment, as shown in FIG. 4, only the drip sensor unit 20 included in the flow rate monitoring device 1 is provided in the sensor side housing 10, and the acceleration sensor unit 30 and the acceleration sensor unit 30 included in the flow rate monitoring device 1 are provided. The notification unit 40 may be provided in the infusion pump 110, and the sensor-side control unit 50 may be provided in the pump-side control unit 120. As a result, it is not necessary to provide the sensor-side control unit 50 in the sensor-side housing 10, the configuration of the sensor-side housing 10 can be simplified, and the flow rate monitoring device 1 is incorporated into the infusion device 100. Is suitable.

Next, the flow rate abnormality notification method in the flow rate monitoring device 1 of the present embodiment will be described with reference to the flowchart of FIG.

The flow rate monitoring device 1 is attached to the drip tube 210 as shown in FIG. 1, and the infusion device 100 is fixedly arranged on the gantry 1100 of the infusion stand 1000. In this state, the pump unit 130 of the infusion device 100 is operated to start the liquid feeding (step S (hereinafter, simply referred to as S) 1).

Next, the number of droplets is measured by the drip sensor unit 20 of the flow rate monitoring device 1 (S2), and it is determined whether or not the movement state detection function of the drip cylinder 210 is enabled (S3).

When the moving state detection function is enabled (YES in S3), the moving state of the drip tube 210 is detected by the acceleration sensor unit 30 (S4).
If the movement state detection function is disabled (NO in S3), the process proceeds to S6.

When it is determined that the drip tube 210 is stationary (NO in S5), the sensor-side control unit 50 uses a preset first threshold value as a predetermined upper threshold value of the flow rate abnormality notification standard (NO). S6). The sensor-side control unit 50 determines whether or not the number of droplets per unit time exceeds the first threshold value as the predetermined upper limit threshold value (S7), and if it exceeds the predetermined upper limit threshold value, the flow rate is abnormal. It is determined that there is (YES in S7), the notification unit 40 is operated to issue a flow rate abnormality alarm (S8), the clamp unit 140 is operated, and the liquid feeding is stopped (S9).
If the number of droplets per unit time does not exceed the predetermined upper limit threshold value (and does not fall below the predetermined lower limit threshold value), it is determined that the flow rate is not abnormal (NO in S7), and the process proceeds to S2. do.

When it is determined that the drip tube 210 is moving (YES in S5), the sensor side control unit 50 uses a preset second threshold value as a predetermined upper threshold value of the flow rate abnormality notification standard (YES in S5). S10).
Next, the sensor-side control unit 50 determines whether or not the drip tube 210 is continuously moving for a certain period of time (S11), and if it is determined that the drip tube 210 is continuously moving for a certain period of time (YES in S11). Since it is possible that some abnormality has occurred in the liquid feeding, the notification unit 40 is operated to notify the liquid feeding abnormality (S12), and the liquid feeding is stopped for safety (S9).
Further, when it is determined that the drip tube 210 is not continuously moving for a certain period of time (NO in S11), the sensor side control unit 50 has a second setting in which the number of droplets per unit time is a predetermined upper limit threshold value. It is determined whether or not the threshold value has been exceeded (S7), and if it exceeds a predetermined upper limit threshold value, it is determined that the flow rate is abnormal (YES in S7), and the notification unit 40 is activated to warn the flow rate abnormality. (S8), the clamp portion 140 is operated, and the liquid feeding is stopped (S9).

According to the flow rate monitoring device 1 and the infusion device 100 of the present invention described above, the following effects are obtained.

(1) The flow rate monitoring device 1 includes a drop sensor unit 20 that detects droplets falling in the drip cylinder 210, an acceleration sensor unit 30 that detects the moving state of the drip cylinder 210, and a notification unit 40 that notifies an abnormality. And a control unit 50 that controls the notification unit 40 based on the number of droplets detected by the drop sensor unit 20 and the acceleration information detected by the acceleration sensor unit 30, and the control unit ( The sensor side control unit 50) determines whether the drip tube 210 is stationary or moving based on the acceleration information, and if the number of droplets per unit time exceeds a predetermined threshold value, there is a flow abnormality. The notification unit 40 was operated, and the first threshold value was used as the predetermined threshold value while the vehicle was stationary, and the second threshold value larger than the first threshold value was used during the movement. As a result, the accelerometer unit 30 detects the moving state of the drip tube 210 and uses the threshold value of the flow rate abnormality according to the moving state, so that the occurrence of false alarm can be reduced. Therefore, it is possible for the medical staff (operator) to reduce the work of confirming the safety of the infusion device 100 and restarting the infusion, which is originally unnecessary due to the false alarm, which contributes to the improvement of work efficiency. In addition, since false alarms are reduced, stress given to the patient can be reduced.

(2) The control unit (sensor side control unit 50) was determined to have an abnormality when the moving state continued for a predetermined time, and the notification unit 40 was operated. If it is determined that the drip tube 210 is continuously moving for a certain period of time, it is possible that some abnormality has occurred in the liquid feeding, so that the notification unit 40 can be activated to notify the liquid feeding abnormality. ..

(3) The flow rate monitoring device 1 is further provided with a clamp portion 140 provided on the downstream tube 232, and the clamp portion 140 is operated when it is determined that the control unit (sensor side control unit 50) has an abnormality. rice field. As a result, when the flow rate monitoring device 1 and the infusion device 100 are independently configured, the opening and closing of the downstream tube 232 can be controlled only by the configuration of the flow rate monitoring device 1 regardless of the operating state of the infusion device 100. ..

(4) The infusion device 100 includes a flow rate monitoring device 1 and a pump unit 130 that presses a tube 232 connected to the downstream side of the drip tube 210 to send liquid. As a result, the infusion device 100 detects the moving state of the drip tube 210 by the acceleration sensor unit 30 and uses the threshold value of the flow rate abnormality according to the moving state, so that the occurrence of erroneous notification is reduced and unnecessary liquid feeding is performed. Stopping can be reduced.

The preferred embodiments and modifications of the flow rate monitoring device, the infusion device, and the flow rate abnormality notification method of the present invention have been described above, but the present invention is not limited to the above-described embodiments and modifications, and may be appropriately modified. Is possible.

For example, in the above-described embodiments and modifications, an example in which a finger pump type pump is used as the pump unit is shown, but the present invention is not limited to this. For example, a roller pump type pump may be used in which the tube is squeezed and the liquid is sent while the roller is rotating.
Further, as another embodiment, the flow rate of the present invention is also applied to an infusion device that does not have a pump unit (injection drive unit), injects infusion liquid only by a head, and controls an injection speed by the degree of closure of the clamp portion. By applying a monitoring device, it is possible to detect whether or not there is an abnormality.
Further, in the present embodiment, the flow rate monitoring device 1 of the present invention is applied to the infusion device of the drip number control method, but the present invention is not limited to this. For example, the flow rate monitoring device of the present invention may be applied to a flow rate control type infusion device that controls the flow rate of the infusion solution by the rotation speed of the roller pump or the like.

1 Flow monitoring device 10 Sensor side housing 20 Drop sensor unit 30 Accelerometer unit 40 Notification unit 50 Sensor side control unit
100 Infusion device 110 Infusion pump 120 Pump side control unit 130 Pump unit 140 Clamp unit 200 Infusion set 210 Intravenous tube 220 Infusion bag 231 Upstream side tube 232 Downstream side tube 240 Penetration needle 1000 Infusion stand 1100 Stand

Claims (6)

It is a flow rate monitoring device used for infusion equipment.
A drop sensor that detects droplets falling inside the drip tube,
An acceleration sensor unit that detects the moving state of the drip tube, and
A notification unit that notifies abnormalities and
A control unit that controls the notification unit based on the number of droplets detected by the drop sensor unit and the acceleration information detected by the acceleration sensor unit.
Equipped with
The control unit determines whether the drip tube is stationary or moving based on the acceleration information, and determines that there is a flow rate abnormality when the number of droplets per unit time exceeds a predetermined threshold value. A flow rate monitoring device that activates the notification unit and uses a first threshold value as a predetermined threshold value when stationary and a second threshold value larger than the first threshold value while moving. The flow rate monitoring device according to claim 1, wherein the control unit determines that there is an abnormality when the moving state continues for a predetermined time, and operates the notification unit. Further provided with a clamp portion provided on the tube connected to the drip tube,
The flow rate monitoring device according to claim 1 or 2, wherein the control unit operates the clamp unit when it is determined that there is an abnormality. The flow rate monitoring device according to any one of claims 1 to 3 and
The pump part that presses the tube connected to the downstream side of the drip tube to send liquid, and
Infusion device equipped with. A drip sensor unit that detects droplets falling in the drip cylinder, an acceleration sensor unit that detects the acceleration applied to the drip cylinder, and a notification unit that notifies an abnormality, which are used in an infusion device that controls the number of drops. An abnormality notification method in a flow rate monitoring device including a control unit that controls the notification unit based on the number of droplets detected by the drop sensor unit and the acceleration information detected by the acceleration sensor unit.
The step of determining whether the drip tube is stationary or moving from the acceleration information, and
When the number of droplets per unit time exceeds a predetermined threshold value, it is determined that there is a flow rate abnormality, and the notification unit is activated.
Equipped with
A method for notifying an abnormality of a flow rate monitoring device, which uses a first threshold value as a predetermined threshold value while stationary and a second threshold value larger than the first threshold value while moving. A step of determining whether or not the moving state of the drip tube continues for a predetermined time, and
A step of operating the notification unit to notify an abnormality when the moving state of the drip tube continues for a predetermined time, and a step of notifying the abnormality.
The abnormality notification method according to claim 5.

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