JPH0553150B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an infusion pump used in a medical automatic drip device or the like.

[Conventional technology]

Generally, an automatic infusion device has a pump part, that is, an infusion pump, which has an infusion tube drawn out from an infusion bottle, a part of the infusion tube provided with the infusion tube, and a member downstream of the infusion tube that exerts a squeezing action on the infusion tube. It is known that the configuration consists of the following.

Therefore, in this type of infusion pump, it is important to monitor the amount of infusion and always perform appropriate infusion in order to manage the patient's infusion. Usually, when an infusion pump is used by a doctor or nurse,
After turning on the power switch, setting the desired infusion flow rate or the number of infusions and volume conversion rate of the infusion set being used at that time, an operation method is adopted in which the infusion pump starts operating.

However, there is a known conventional infusion pump in which settings such as the conversion rate are set using a mechanical digital switch. In this case, when using the same infusion set as the one used last time, there is no need to reset the conversion rate, but there is a drawback that the structure is susceptible to failure due to dust or water droplets from the outside. This is inconvenient as an infusion pump.

[Problem to be solved by the invention]

Conversion rate for the number of infusions and volume of IV infusion set normally used in hospitals (hereinafter simply referred to as conversion rate)
varies depending on the type of infusion set. In this case, there is a tendency to reduce the number of types of infusion sets for intravenous drips available in hospitals from the viewpoint of operability and inventory control. Therefore, it is rare for the conversion rate to change within the same hospital. However, in general, infusion pumps are equipped with a drip sensor that detects the number of drops in an infusion tube installed in an upstream infusion tube, and this drip sensor detects the number of drops in a certain period of time. The operation of the infusion pump is controlled to achieve the required set value (this type of control method is referred to as a drop number feedback control method). Therefore,
In an infusion pump that performs such control, the conversion rate must be set each time the power switch is turned on, which is time-consuming and complicated.

In addition, for cases in which a patient moves to a hospital room or an operating room, a two-power system has been put into practical use, in which the infusion pump is equipped with a battery power source and the entire infusion pump is operated by this battery power source. However, with this type of infusion pump, if the battery voltage drops and the infusion pump stops operating when the power plug is removed from the outlet and the infusion pump is operating on the battery power, the infusion pump will return to its previous operating state. Since there is no mechanism for storing and retaining setting data such as conversion rates, this type of setting data is often lost. In such a case, it is necessary to insert the power plug of the infusion pump into an outlet and reset the infusion flow rate, conversion rate, etc., which makes the operation cumbersome.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a memory circuit that stores and retains the setting data regarding the conversion rate of the infusion set used immediately before the power is cut off to the control unit, and when the power is re-supplied. The control unit determines the validity of the setting data stored in the memory circuit, and when it is determined to be invalid, the same infusion set is adopted by adopting predetermined status data set in advance. To provide an infusion pump that can be operated easily and safely without initializing data each time it is used.

[Means to solve the problem]

The infusion pump according to the present invention includes a pump mechanism that sequentially presses and closes an infusion tube to send liquid, and a drip sensor that detects the number of drops in an infusion tube provided in the infusion tube upstream of the pump mechanism. In an infusion pump that controls the drive of the pump mechanism using a drop number feedback control method, a setting device is provided to set the conversion rate for the number of drops and volume, and the infusion flow rate, respectively, and a backup is provided to store data regarding these conversion factors and the infusion flow rate. A calculation system consisting of a RAM equipped with a power supply, a ROM, and a CPU to retain the data stored in the RAM when the power supply to the infusion pump is stopped, and to automatically perform initial settings based on the data when power supply to the infusion pump is started. A control circuit is installed to detect a voltage drop in the power supply unit that supplies power and reset the CPU.
A voltage drop detection circuit is installed to stop the RAM function, and furthermore, when the power supply to the infusion pump starts, the RAM
The validity of the data stored in the ROM is determined, and if the data is valid, initial settings are performed using the data, and if the data is not valid, the conversion rate for the specific number of infusions and volume set in advance is set in the ROM. The present invention is characterized by comprising a control program that performs initial settings using status data indicating an infusion flow rate.

[Effect]

According to the infusion pump according to the present invention, in order to control the pump mechanism, when setting the number of infusions, the conversion rate of the volume, and the flow rate of hot water using the setting device,
Data regarding these conversion factors and infusion flow rates are stored and retained in a memory circuit equipped with a backup power supply, and even when the power supply that drives and controls the infusion pump is cut off and its operation is stopped, the setting data is memorized and retained, and the infusion pump When power is supplied to the infusion pump, the setting data stored in the memory circuit is automatically initialized, and the arithmetic control circuit of the infusion pump can be started quickly and easily. Furthermore, when power is supplied to the infusion pump, the validity of the setting data stored in the memory circuit is determined, and if the setting data is not valid, the initial setting is performed using predetermined status data.By setting the program, the control operation can be controlled. Facilitation and safety can be ensured.

〔Example〕

Next, embodiments of the infusion pump according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a schematic configuration diagram showing a pump mechanism and a control system of an infusion pump according to the present invention. In FIG. 1, the pump mechanism of the infusion pump includes an elastic infusion tube 10, and a plurality of peristaltic finger members 12 that sequentially press to close and open the infusion tube 10 on one side thereof.
Infusion tube 1 is placed opposite this finger member 12.
0, and a presser plate 16 held by a spring 14 that fixes the other side of the 0. Further, the finger members 12 are held by a holder, and each finger member 12 has an elongated hole, and eccentric cams are positioned in these elongated holes, and the rotating shaft 18 is inserted through these eccentric cams. By doing so,
It is configured to cause the required peristalsis. In this case, the eccentric cams fixed to the rotating shaft 18 are configured and arranged so as to have a delay angle of 360°/number of cams with respect to the adjacent upstream eccentric cams.
By converting the rotational movement of the eccentric cam into linear movement of the finger member 12, the liquid in the infusion tube 10 can be transferred while being pressed. Therefore, one end of the rotating shaft 18 is coupled to a driving shaft 24 of a motor 22 via a coupling 20. In addition, the infusion tube 1 of the pump mechanism configured in this way
0 is provided with a drip tube 30 on its upstream side, and furthermore, an infusion bottle (not shown) is appropriately connected to its upstream side. The drip tube 30 is provided with a drip sensor 32 on its outer periphery to detect the number of drops of infusion fluid.

Next, as shown in FIG. 1, the control system of the infusion pump in this embodiment includes a motor drive circuit 34 that drives the motor 22 for operating the finger member 12 of the pump mechanism. The drive circuit 34 is configured to be controlled by a control section 36, which will be described later. Note that this control section 3
6, the conversion rate can be externally set by the conversion rate setting device 38, and the infusion flow rate can be externally set by the infusion flow rate setting device 40. Further, the control unit 36 detects the number of drops in a certain period of time using a drop sensor 32 provided in the pump mechanism, and controls the infusion pump, that is, provides a drop number feedback so that the number of drops reaches a required set value. configured to perform control;

FIG. 2 shows details of the control section 36 that constitutes the control system of the above-mentioned infusion pump. That is, in FIG. 2, the control unit 36 controls the CPU 42.
, a ROM 44 , and a RAM 46 , which are interconnected to an I/O port 48 by a bus. The I/O port 48 includes a drip number data input circuit 50 for inputting the drip number data detected by the drip sensor 32, and a switch for inputting setting data by the conversion rate setting device 38 and the infusion flow rate setting device 40. The input circuit 54 and the motor drive circuit 34 are connected to each other. Further, operating power is supplied from a power supply unit 56 to each element of the control section 36 and peripheral circuits connected thereto. A commercial power supply 58 is connected to this power supply unit 56 via a power switch 60.
However, in this embodiment, a voltage detector 62 is provided on the output line that supplies power to the power supply unit 56, and the voltage detected by this voltage detector 62 is sent to a voltage drop detection circuit 64 provided in the control section 36. input, and a voltage drop below a specified value is detected.
It is configured to output necessary control signals to the CPU 42 and RAM 46. Note that the RAM4
6 is a battery 66 as a backup power source.
Connect.

Next, the operation of the control section 36 having the above-described configuration will be explained. It is now assumed that the required operating power is being supplied from the power supply unit 56 to the control section 36 and its peripheral circuits. At this time, the conversion rate setting device 38
When setting data is input from the infusion flow rate setting device 40 and the infusion flow rate setting device 40, this setting data is transferred to the RAM via the switch input circuit 54 and the I/O port 48.
46. Note that the ROM 44 stores a program for determining the suitability of the conversion rate of the number of infusions and volume and the infusion flow rate, which will be described later. state data is stored.

In the above state, when the power switch 62 is turned off, power is no longer supplied to the control section 36. This condition can be immediately detected by the voltage drop detection circuit 64 via the voltage detector 62. At this time, the voltage drop detection circuit 64
Sends a reset signal to the CPU 42 and
Sends a function stop signal to RAM46. The battery 66 supplies power for data retention to the RAM 46. As a result,
Data stored in RAM 46 is retained for a long period of time.

Next, when the infusion pump is used, when the power switch 62 is turned on, power is supplied to the control unit 36, the reset signal to the CPU 42 is canceled, the function stop signal to the RAM 46 is also canceled, and the data written in the ROM 44 is canceled. The program is executed to perform initial settings for starting the motor drive circuit 34 for operating the infusion pump.

Therefore, a program stored in the ROM 44 for initializing the motor drive circuit 34 mentioned above is set as shown in FIG. 3, for example. In this case, the ROM 44 stores 100 ml/h as the infusion flow rate and 15 drops/ml as the conversion rate between the number of infusions and the volume as state data. Initially, the infusion flow rate stored in RAM 46 is 1.
ml/h or more, then 400ml/h
Compares whether it is less than or equal to. In this manner, if the infusion flow rate completely satisfies these conditions, the setting data is initialized as is. but,
If the infusion flow rate does not satisfy the conditions,
Infusion flow rate of status data stored in ROM44
The initial setting is 100ml/h. Next, RAM4
The conversion rate for the number of drips and volume stored in 6 is 10
It is compared to see if it is greater than or equal to 65 drops/ml, and then it is compared to see if it is less than or equal to 65 drops/ml. In this way, if the conversion rate satisfies all of these conditions, the setting data is initialized as is. However, if the conversion rate does not satisfy the conditions, the ROM44
The conversion rate of 15 drops/ml of the status data stored in is initially set. In this way, if the last used setting data of the infusion pump is properly stored in the RAM 46, the initial settings will be automatically performed without having to manually initialize the setting data when the infusion pump is used again. be able to. In addition, battery 6
If the infusion pump is not used for such a long time that the power supply in 6 is almost completely discharged,
The setting data stored in the RAM 46 will be lost, but in such a case, as mentioned above, the infusion flow rate of 100 ml/h and the conversion rate of 15 drops/ml in the status data stored in the ROM 44 will be lost. Initialized. Furthermore, the battery 66 used in this embodiment is configured to be charged by the supplied power when power is supplied from the power supply unit 56, so that it does not need to be replaced frequently, which is advantageous in terms of maintenance. becomes.

〔Effect of the invention〕

As is clear from the embodiments described above, according to the present invention, in order to control the drive of the pump mechanism,
Data regarding the conversion rate and infusion flow rate are stored in a memory circuit equipped with a backup power source using a setting device that sets the conversion rate for the number of infusions and volume, and the infusion flow rate, so that, for example, when the infusion pump power is turned off, The setting data can also be effectively stored and held. Therefore, when power is supplied to the infusion pump, the stored setting data can be read out and initial settings for controlling the drive of the infusion pump can be automatically performed. Furthermore, when reading out the setting data stored in the memory circuit, the validity of the setting data is determined, and if the setting data is not valid, initial setting is performed using predetermined state data stored and set in advance, thereby preventing modification of the setting data. It is possible to ensure safety in the event of loss and to improve the automatic control performance of this type of infusion pump.

Therefore, by using the infusion pump of the present invention as an automatic infusion device, for basic drive control, there is no need to manually set the setting data each time the pump is used, and proper setting data is always available. Since the machine can be automatically initialized and operated, it has become possible to further improve work efficiency and safety.

Although preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and it goes without saying that various design changes can be made without departing from the spirit of the present invention. .

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a pump mechanism and control system showing an embodiment of the infusion pump according to the present invention, and FIG. 2 shows an embodiment of the control circuit in the control section of the infusion pump shown in FIG. Main part wiring diagram, Figure 3 is the 2nd
FIG. 2 is a flowchart showing an example of a program for determining the appropriateness of setting data by the control unit shown in the figure. 10... Infusion tube, 12... Finger member, 14... Spring, 16... Holding plate, 18... Rotating shaft, 20... Coupling, 22... Motor,
24... Drive shaft, 30... Drip tube, 32... Dripping sensor, 34... Motor drive circuit, 36... Control unit, 38... Conversion rate setting device, 40... Infusion flow rate setting device, 42... CPU, 44...ROM, 46...
RAM, 48...I/O port, 50...Drop number data input circuit, 54...Switch input circuit, 5
6...Power supply unit, 58...Commercial power supply, 60...
...Power switch, 62...Voltage detector, 64...
Voltage drop detection circuit, 66...Battery.

Claims (1)

[Scope of Claims] 1. A pump mechanism unit that sequentially presses and closes an infusion tube to send liquid, and a drip sensor that detects the number of drops in an infusion tube provided in the infusion tube upstream of the pump mechanism unit, In an infusion pump that controls the drive of the pump mechanism using a drop number feedback control method, a setting device is provided to set the conversion rate for the number of infusions and volume, and the infusion flow rate, respectively, and a backup power supply is provided to store data regarding these conversion factors and the infusion flow rate. A calculation control system consisting of a RAM with an attached RAM, and a ROM and a CPU to retain the data stored in the RAM when the power supply to the infusion pump is stopped and to automatically perform initial settings based on the data when power supply to the infusion pump is started. A circuit is installed to detect a voltage drop in the power supply unit that supplies power and reset the CPU.
A voltage drop detection circuit is installed to stop the RAM function, and furthermore, when the power supply to the infusion pump starts, the RAM
The validity of the data stored in the ROM is determined, and if the data is valid, initial settings are performed using the data, and if the data is not valid, the conversion rate for the specific number of infusions and volume set in advance is set in the ROM. An infusion pump characterized by comprising a control program that performs initial settings using status data indicating an infusion flow rate.