JP2019177131A - Flow volume monitoring device, infusion device and abnormality notification method - Google Patents

Abstract

To reduce false notification of flow volume abnormality occurring when a patient moves, in a flow volume monitoring device for infusion.SOLUTION: A flow volume monitoring device 1 used for infusion device 100 comprises: a droplet fall sensor part 20 detecting a droplet falling in a drip cylinder 210; an acceleration sensor 30 detecting a movement state of the drip cylinder 210; a notification part 40 notifying a user of abnormality; and a sensor side control part 50 controlling the notification part 40 on the basis of the number of droplets detected by the droplet fall sensor part 20 and acceleration information detected by the acceleration sensor part 30. The sensor side control part 50 determines whether the drip cylinder 210 is moved or is at rest based on the acceleration information, and when the number of droplets per unit time exceeds a prescribed threshold, determines that flow volume is abnormal and actuates the notification part 40, and uses, as the prescribed threshold, a first threshold when the drip cylinder is at rest and a second threshold larger than the first threshold when the drip cylinder moves.SELECTED DRAWING: Figure 2

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, when it is necessary to accurately deliver liquids such as drugs, nutrients, and blood to a patient at a predetermined speed and amount, an infusion device including a pump is used.
When infusion is performed on a patient, an infusion stand is used to place an infusion device and an infusion bag. The infusion device is fixedly disposed in the middle of the infusion stand, the infusion bag is suspended above the infusion stand, and the drip tube is disposed between the infusion device and the infusion bag via a tube. In addition, a drop sensor is attached to the drip tube for monitoring an abnormal flow rate.

  In the infusion device of the drip number control system, the liquid droplets falling in the drip tube are measured by a drip sensor, and the amount of liquid delivered by the pump is controlled so that the number of liquid droplets per unit time becomes a predetermined value. The infusion device determines that the amount of liquid delivered is abnormal when the number of droplets per unit time measured by the drop-drop sensor exceeds or falls below the number of droplets prescribed in advance in the infusion device. Then, it has a function of issuing an alarm of abnormal flow rate and stopping liquid feeding (see Patent Document 1). When an alarm is issued, a health care worker (operator) such as a nurse corrects the abnormality and confirms safety, and then resumes liquid feeding.

JP2013-52284A

By the way, since infusion using an infusion device is often performed over a long period of time, a patient may move by pushing an infusion stand in order to go to a toilet or examination room.
When the patient is moving in this way, fluctuations in the liquid level in the infusion tube, rebounding of the liquid droplets, and irregular drops may occur temporarily due to shaking or impact of the infusion stand. In spite of no abnormality, the number of droplets measured by the droplet drop sensor exceeds the specified amount, an alarm is issued, and the liquid feeding to the patient is stopped. Further, the operator needs to confirm the abnormal state of the infusion device and resume the liquid feeding.

  Therefore, an object of the present invention is to provide a flow rate monitoring device, an infusion device, and an abnormality notification method that can reduce the occurrence of erroneous notification of an abnormal flow rate when a patient moves.

  The present invention relates to a flow rate monitoring device used in an infusion device, a drop sensor unit that detects a droplet that falls in an infusion tube, an acceleration sensor unit that detects a moving state of the infusion tube, and an abnormality notification And a control unit that controls the notification unit based on the number of droplets detected by the droplet drop sensor unit and the acceleration information detected by the acceleration sensor unit. And determining whether the drip tube is stationary or moving based on the acceleration information, and determining that there is an abnormal flow rate when the number of droplets per unit time exceeds a predetermined threshold, and informing the notification The present invention relates to a flow rate monitoring apparatus that uses a first threshold value when stationary and a second threshold value that is larger than the first threshold value during movement as the predetermined threshold value.

  Moreover, it is preferable that the said control part determines that there exists abnormality when the state during a movement continues for a predetermined period, and operates the said alerting | reporting part.

  Moreover, it is preferable to further include a clamp part provided in a tube connected to the drip tube, and when the control part determines that there is an abnormality, it is preferable to operate the clamp part.

  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 a downstream side of a drip tube and performs liquid feeding.

  In addition, the present invention is used in an infusion device, a drop sensor unit that detects a droplet falling in a drip tube, an acceleration sensor unit that detects acceleration applied to the drip tube, and a notification unit that notifies an abnormality An abnormality notification method in a flow rate monitoring apparatus comprising: a control unit that controls the notification unit based on the number of droplets detected by the droplet drop sensor unit and acceleration information detected by the acceleration sensor unit. Determining whether the drip tube is stationary or moving from the acceleration information, and determining that there is a flow rate abnormality when the number of droplets per unit time exceeds a predetermined threshold, and informing the notification An abnormality of the flow rate monitoring device using the first threshold value during stationary and a second threshold value larger than the first threshold during movement as the predetermined threshold value It relates to a notification method.

  In addition, the step of determining whether or not the state in which the drip tube is moving continues for a predetermined time, and when the state in which the drip tube is moving continues for a predetermined time, the notification unit is operated to cause an abnormality. It is preferable to provide the process of alert | reporting.

  According to the present invention, it is possible to reduce the occurrence of erroneous notification by detecting the moving state of the drip tube by the acceleration sensor unit and using the threshold value of the flow rate abnormality corresponding to the moving state.

It is a figure which shows the use condition of the flow volume monitoring apparatus and infusion apparatus of this invention. It is a block diagram of a flow monitoring device and an infusion device of the present invention. It is a block diagram of a flow monitoring device and an infusion device concerning modification 1 of the present invention. It is a block diagram of the flow monitoring device and infusion device concerning modification 2 of the present invention. It is a figure which shows the flowchart of the abnormality alerting | reporting method in the flow volume monitoring apparatus of this invention.

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

<Embodiment>
FIG. 1 shows a state in which the flow rate monitoring device 1 and the infusion device 100 of the present invention are disposed on an infusion stand 1000 and an infusion set 200 is attached. The flow rate monitoring device 1 is for monitoring the administration state of a chemical solution when a liquid such as a chemical solution or a nutrient solution is accurately administered to a patient at a predetermined speed and amount, and is used with the infusion set 200. Moreover, the infusion apparatus 100 of this embodiment controls the amount of liquid delivery by a dripping number control system.

  Before describing the structures 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 an infusion tube 210, an infusion bag 220 containing the infusion, an upstream tube 231 extending from the infusion bag 220 to the infusion tube 210, a downstream tube 232 extending from the infusion tube 210 to the puncture needle 240, Is provided. In the 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 the drip tube 210, the droplet grows in the upper part of the drip tube 210, and when the droplet reaches a predetermined size, it drops downward and collects and accumulates in the lower part of the drip tube 210. Infusion is administered to the patient.
The infusion bag 220 is composed of a member having transparency and flexibility, such as polyethylene. In the infusion bag 220, for example, liquids such as physiological saline, glucose solution, and blood are accommodated.
The upstream side tube 231 and the downstream side tube 232 are configured by members having transparency and flexibility such as polyvinyl chloride, for example.

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 disposed on a gantry 1100 included in the infusion stand 1000.

First, the flow rate monitoring device 1 provided 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 that can hold the drip tube 210 at the center.

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

The acceleration sensor unit 30 detects the moving state of the drip tube 210. The acceleration sensor unit 30 can use any method as long as it can detect whether the drip tube 210 is stationary or moving. A known capacitance detection type or piezoresistive type acceleration sensor may be used.
Moreover, as long as it can detect the movement state of the drip tube 210, that is, the infusion stand 1000, the acceleration sensor unit 30 may be attached to either the sensor-side housing 10 or the infusion pump 110. 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. Note that whether to enable or disable the function may be arbitrarily set as to whether or not the movement state of the drip tube 210 is detected by the acceleration sensor unit 30.

  The notification unit 40 is for notifying a medical worker (operator) of an abnormal state when there is an abnormality in the infusion, and is configured by an alarm device that sounds an alarm sound and a display unit that displays the abnormal state. . Moreover, about the attachment location of the alerting | reporting part 40, you may attach to either the sensor side housing | casing 10 or the infusion pump 110, and the alerting | reporting part 40 was attached to the sensor side housing | casing 10 in this embodiment.

  The sensor side control unit 50 is provided in the sensor side housing 10. The sensor-side control unit 50 is configured by a computer device including a central processing unit, RAM, ROM, and the like, for example. The sensor-side control unit 50 controls the notification unit 40 based on the number of droplets detected by the droplet drop sensor unit 20 and the acceleration information detected by the acceleration sensor unit 30. Specifically, the sensor-side control unit 50 determines the flow rate when the number of droplets per unit time is below a preset lower threshold value and above a preset 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 indicating an abnormal flow rate is transmitted to the infusion device 1.

When it is determined that the drip tube 210 is stationary based on the acceleration information detected by the acceleration sensor unit 30, the sensor side control unit 50 uses the first threshold value set in advance as the above-described upper threshold value. If it is determined that the drip tube 210 is moving, the second threshold value set in advance as the upper threshold value is used.
Here, when the drip tube 210 is moved while being suspended from the infusion stand 1000, fluctuations in the liquid level in the drip tube 210, rebounding of the droplets, 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 increase more than the number of drops per unit time at rest. However, in practice, since the flow rate is almost never increased, it is not appropriate to use the first threshold value as the upper limit threshold value. Therefore, in the present embodiment, the second threshold value that is larger than the first threshold value is used as the above-described upper threshold value. More specifically, the number of drops that is twice the amount of the first threshold can be used as the second threshold.

  Note that the determination of the moving state (still or moving) is performed every time a predetermined time has elapsed from the start of liquid feeding (S1). For example, it may be performed every time the motor rotates a predetermined number of times in the pump unit 130 described later.

  Next, the infusion pump 110 provided 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 flow rate, and the like are provided.

  The pump-side control unit 120 is configured by a central processing unit, a computer device including a RAM, a ROM, and the like, like the sensor-side control unit 50. The pump-side control unit 120 is connected to the sensor-side control unit 50 via the signal line SL. From the sensor-side control unit 50, information on the number of droplets detected by the droplet sensor unit 20 and the acceleration sensor unit 30. Acquire acceleration information to be detected. The pump-side control unit 120 controls the pump unit 130 and the clamp unit 140 based on these pieces of information.

  The pump unit 130 presses the downstream side tube 232 to perform liquid feeding. 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 droplet drop sensor unit 20 of the flow rate monitoring device 1 becomes a set predetermined value (dropping). Number control method).

  The clamp unit 140 is an electric clamp and is provided on the upstream side of the pump unit 130 in the downstream tube 232. 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 drop-drop sensor unit 20, the acceleration sensor unit 30, the notification unit 40 and the sensor-side control unit 50 that controls these are provided in the sensor-side housing 10. Since it was set as the structure provided, the flow volume monitoring apparatus 1 and the infusion apparatus 100 can be comprised independently.

  Moreover, as a first modification of the present embodiment, as shown in FIG. 3, a drop sensor unit 20, an acceleration sensor unit 30, an informing unit 40, a clamp unit 140, and a sensor side that controls these units included in the flow rate monitoring device 1. The control unit 50 may be provided in the sensor-side casing 10. Thereby, the flow monitoring device 1 and the infusion device 100 can be configured independently, and the opening and closing of the downstream tube 232 is controlled only by the configuration of the flow monitoring device 1 regardless of the operating state of the infusion device 100. Can do.

  Further, as a second modification of the present embodiment, as illustrated in FIG. 4, only the drop sensor unit 20 provided in the flow rate monitoring device 1 is provided in the sensor-side housing 10, and the acceleration sensor unit 30 provided in the flow rate monitoring device 1 and 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. Thereby, there is no need 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 configured to be incorporated in the infusion device 100. Is suitable.

  Next, a 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 in a state of being attached to the drip tube 210 as shown in FIG. 1, and the infusion device 100 is in a state of being fixedly disposed 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 feeding (step S (hereinafter simply referred to as S) 1).

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

When the movement state detection function is enabled (YES in S3), the movement 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 the first threshold value set in advance as the predetermined upper threshold value for the flow rate abnormality notification standard ( S6). The sensor-side control unit 50 determines whether or not the number of droplets per unit time has exceeded a first threshold value as a predetermined upper limit threshold value (S7). It is determined that there is (YES in S7), the notification unit 40 is activated, a flow rate abnormality alarm is issued (S8), the clamp unit 140 is activated, and the liquid feeding is stopped (S9).
If the number of droplets per unit time does not exceed the predetermined upper limit threshold (and does not fall below the predetermined lower limit threshold), it is determined that the flow rate is not abnormal (NO in S7), and the process proceeds to S2. To 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 for the flow rate abnormality notification standard ( S10).
Next, the sensor-side control unit 50 determines whether or not the infusion tube 210 is continuously moving for a certain time (S11), and when it is determined that the infusion tube 210 is continuously moving for a certain time (YES in S11). Since there is a possibility that some abnormality has occurred in the liquid supply, the notification unit 40 is operated to notify the liquid supply abnormality (S12), and the liquid supply is stopped for safety (S9).
If it is determined that the drip tube 210 is not moving continuously for a certain time (NO in S11), the sensor-side control unit 50 sets the second number of droplets per unit time as the predetermined upper limit threshold. (S7). If the predetermined upper limit threshold is exceeded, it is determined that the flow rate is abnormal (YES in S7), the notification unit 40 is activated, and a flow rate abnormality alarm is issued. (S8), the clamp unit 140 is operated, and the liquid feeding is stopped (S9).

  The flow rate monitoring device 1 and the infusion device 100 of the present invention described above have the following effects.

  (1) The flow rate monitoring device 1 includes a drop sensor unit 20 that detects a droplet that falls within the drip tube 210, an acceleration sensor unit 30 that detects a moving state of the drip tube 210, and a notification unit 40 that reports an abnormality. And a control unit 50 that controls the notification unit 40 based on the number of droplets detected by the droplet drop sensor unit 20 and acceleration information detected by the acceleration sensor unit 30. 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, there is an abnormal flow rate. Then, the notification unit 40 is operated, and the first threshold value is used as the predetermined threshold value when stationary, and the second threshold value larger than the first threshold value is used during movement. Thereby, since the movement state of the drip tube 210 is detected by the acceleration sensor unit 30 and the flow rate abnormality threshold corresponding to the movement state is used, it is possible to reduce the occurrence of erroneous notification. Therefore, the medical worker (operator) can reduce the safety check of the infusion device 100 which is originally unnecessary due to the false notification and the work of resuming the liquid feeding, which contributes to the improvement of the work efficiency. Moreover, since false notifications are reduced, the stress given to the patient can be reduced.

  (2) The control unit (sensor-side control unit 50) determines that there is an abnormality when the moving state continues for a predetermined time, and operates the notification unit 40. If it is determined that the drip tube 210 is moving continuously for a certain period of time, there is a possibility that some abnormality has occurred in the liquid feeding, and therefore the liquid feeding abnormality can be reported by operating the notification unit 40. .

  (3) The flow rate monitoring device 1 is further provided with a clamp unit 140 provided in the downstream tube 232, and when it is determined that the control unit (sensor side control unit 50) has an abnormality, the clamp unit 140 is operated. It was. Accordingly, when the flow rate monitoring device 1 and the infusion device 100 are configured independently, 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 the flow rate monitoring device 1 and the pump unit 130 that presses the tube 232 connected to the downstream side of the drip tube 210 and performs liquid feeding. Thereby, since the infusion apparatus 100 detects the movement state of the drip tube 210 by the acceleration sensor unit 30 and uses the threshold value of the flow rate abnormality corresponding to the movement state, it reduces the occurrence of false notifications and eliminates unnecessary liquid feeding. Stops 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 can be changed as appropriate. Is possible.

For example, in the above-described embodiment and modification, an example in which a finger pump type pump is used as the pump unit has been described, but the present invention is not limited thereto. For example, you may use the roller pump type pump which squeezes a tube and sends liquid, while a roller rotates.
Furthermore, as another embodiment, the flow rate of the present invention is also applied to an infusion device that does not have a pump unit (infusion drive unit), infuses an infusion only with a drop, and controls the infusion rate based on the degree of blockage of the clamp unit. By applying a monitoring device, it can be detected whether or not there is an abnormality.
Moreover, in this embodiment, although the flow monitoring apparatus 1 of this invention was applied to the infusion apparatus of a dripping number control system, it is not restricted 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 number of rotations of a roller pump.

DESCRIPTION OF SYMBOLS 1 Flow monitoring apparatus 10 Sensor side housing | casing 20 Drop drop sensor part 30 Acceleration sensor part 40 Notification part 50 Sensor side control part
DESCRIPTION OF SYMBOLS 100 Infusion apparatus 110 Infusion pump 120 Pump side control part 130 Pump part 140 Clamp part 200 Infusion set 210 Drip tube 220 Infusion bag 231 Upstream side tube 232 Downstream side tube 240 Puncture needle 1000 Infusion stand 1100 Stand

Claims (6)

A flow rate monitoring device used in an infusion device,
A drop sensor unit for detecting a droplet falling in the drip tube;
An acceleration sensor unit for detecting a movement state of the drip tube;
An informing unit for informing the abnormality;
A control unit for controlling the notification unit based on the number of droplets detected by the droplet drop sensor unit and the acceleration information detected by the acceleration sensor unit;
With
The control unit determines whether the infusion 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. Then, the flow rate monitoring device that operates the notification unit and uses the first threshold value as the predetermined threshold value when stationary, and the second threshold value that is larger than the first threshold value during movement.   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 comprising a clamp provided on a tube connected to the drip tube,
The flow rate monitoring apparatus according to claim 1, wherein the control unit activates 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,
A pump unit for feeding liquid by pressing a tube connected to the downstream side of the drip tube;
An infusion device comprising: A drop number sensor unit that is used in an infusion device that controls the number of drops, detects a droplet that falls within the drip tube, an acceleration sensor unit that detects an acceleration applied to the drip tube, and a notification unit that reports an abnormality; A control unit that controls the notification unit based on the number of droplets detected by the droplet drop sensor unit and acceleration information detected by the acceleration sensor unit;
Determining whether the drip tube is stationary or moving from the acceleration information;
Determining that there is a flow rate abnormality when the number of droplets per unit time exceeds a predetermined threshold, and operating the notification unit;
With
An abnormality notification method for a flow rate monitoring apparatus that uses the first threshold value as the predetermined threshold value when stationary, and uses a second threshold value that is larger than the first threshold value during movement. Determining whether the moving state of the infusion tube continues for a predetermined time;
When the state in which the infusion tube is moving continues for a predetermined time, the step of informing the abnormality by operating the notification unit;
An abnormality notification method according to claim 5.

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