JPH0277267A - Liquid transfusing pump - Google Patents

Abstract

PURPOSE:To easily and safely execute an action without initializing data each time of a use when a power is not supplied to a control part by setting the conversion rate of the number and quantity of installations and a liquid transfusion flow rate, respectively, and storing and holding the data related to the conversion rate and liquid transfusion flow rate into a memory circuit to which a back-up power source is added. CONSTITUTION:For example, into a ROM 44, 100ml/h as the liquid transfusion flow rate and 15 drop/ml as the conversion rate of the number and quantity of instillations are stored as condition data. First, whether the transfusion flow rate stored in a RAM 46 is at 1ml/h or above or not is compared, and thereafter, whether it is at 400ml/h or below or not is compared. In such a way, when the liquid transfusion flow rate satisfies all the conditions, set data are initialized as they are. However, when the liquid transfusion flow rate does not satisfy the above-mentioned conditions, the liquid transfusion flow rate 100ml/h of the condition data stored in the ROM 44 is initialized.

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 section, that is, an infusion pump, which has an infusion tube led out from an infusion bottle, a drip tube provided in a part of the infusion tube, and a member on the downstream side that performs a squeezing action on the infusion tube. A configuration is known in which a configuration is provided.

Therefore, in this type of infusion pump, the patient's IP
In terms of fluid management, it is important to monitor the amount of fluid injected and always administer the appropriate fluid. Normally, when an infusion pump is used by a doctor or @guardian, after turning on the power switch, set the desired infusion flow rate or the number of infusions and volume conversion rate of the infusion set being used at that time. After that, an operating method is adopted that starts the operation of the infusion pump.

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. This is inconvenient as a pump.

[Problem to be solved by the invention]

Normally, the conversion rate (hereinafter simply referred to as conversion rate) for the number of infusions and the amount of %III superfluid for infusion used in hospitals differs depending on the type of infusion set. In this case, there is a tendency to reduce the number of types of infusion sets available in hospitals from the viewpoint of operability, inventory management, and the like. 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 the upstream infusion tube, and this drip sensor detects the number of drops in a certain period of time, and calculates the number of drops. 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 every time the power switch is turned on, which is time-consuming and complicated.

In addition, for cases where 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 bottle 1 stops operating when the power plug is removed from the outlet and the infusion is running on battery power, the setting data such as the conversion rate from the previous operating state will be stored. This type of setting data is often lost because it is not equipped with a storage device.In such cases, plug the power plug of the infusion bottle 1 into the outlet and reset the infusion flow rate, conversion rate, etc. However, there is a drawback that the operation is troublesome.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a memory circuit that stores and holds 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, preset predetermined status data is adopted, so that when the same infusion set is adopted, its use To provide an infusion pump that can be operated simply and safely without initializing data each time.

[Means to solve the problem]

The infusion pump according to the present invention includes 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 on the infusion tube upstream of the pump mechanism unit. In an infusion pump configured to control the drive of the pump mechanism using a drop number feedback control system, a setting device is provided to set the conversion rate for the number of infusions and volume, and the infusion flow rate, respectively. a memory circuit equipped with a backup power supply that stores data related to the infusion pump; and an operation that retains the data stored in the memory circuit when power to the infusion pump is stopped and automatically performs initial settings based on the data when power supply to the infusion pump is started. A control circuit is provided.

In the above-mentioned infusion pump, the memory circuit is made up of RAM, and the arithmetic control circuit is made up of ROM and CPU.
A voltage drop detection circuit is installed to reset the PU and stop the RAM function.
A control program is provided that determines the validity of data stored in the AM, performs initial settings using the data if the data is valid, and performs initial settings using predetermined state data set in advance in the ROM if the data is not valid. It is preferable to have this configuration.

[Effect]

According to the infusion pump according to the present invention, when setting the conversion rate of the number of infusions and volume and the infusion flow rate using the setting device in order to control the pump mechanism, data regarding these conversion factors and the infusion flow rate are backed up. The setting data is memorized and retained in a memory circuit equipped with a power supply, and even when the power supply that drives and controls the infusion pump is cut off to stop its operation, the setting data is memorized and retained, and when power is supplied to the infusion pump, the memory circuit The arithmetic control circuit of the infusion pump can be started quickly and easily by automatically initializing the setting data stored in the infusion pump. In addition, 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 set in advance.
Smooth control operations and safety can be ensured.

〔Example〕

Next, embodiments of the M liquid 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 liquid pump includes an elastic infusion tube 10, and a plurality of spiral finger members 12 that sequentially close and open the infusion tube 10 by pressure. A presser plate 16 is provided facing the finger member 12 and held by a spring 14 for fixing the other side of the infusion tube 10. Further, the finger members 12 are held by a holder, and each finger member 12 has an elongated hole, and eccentric cams are positioned within these elongated holes. By inserting and arranging the screw, the required screw movement is generated. In this case, the eccentric cams fixed to the rotating shaft 18 are connected to the adjacent upstream! By arranging it so that it has a delay angle of 360°/number of cams with respect to the eccentric cam,
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 rotation shaft 18 is coupled to a drive shaft 24 of a motor 22 via a coupling 20.

Note that the infusion tube 10 of the pump mechanism configured in this manner is provided with a drip tube 30 on its upstream side, and an appropriate infusion bottle (not shown) is further connected to the upstream side thereof. And the said intravenous drip f! ? The i30 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 on the side of the pump machine. The motor drive circuit 34 is configured to be controlled by a control section 36, which will be described later. Note that the control unit 36 is capable of externally setting a conversion rate using a conversion rate setting device 38 and externally setting an infusion flow rate using an infusion flow rate setting device 40. In addition, 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 so that the number of drops reaches a required set value, that is, provides feedback on the number of drops. 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
, ROM44, and RAM46, these are I1
They are mutually bus-connected to the 0 boat 48. I10
The boat 48 includes a drip number data input circuit 50 for inputting the drip number data detected by the drip sensor 32, and a switch input circuit 54 for inputting setting data from the conversion rate setting device 38 and the infusion flow rate setting device 40. and a 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 source 58 is connected to this power source 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 the voltage detector 62 is detected by the voltage drop detection circuit 6 provided in the control section 36.
4 and is configured to output a required control signal to the CPU 112 and RAM 46 when a voltage drop below a predetermined value is detected. Note that a battery 66 is connected to the RAM 46 as a backup power source.

Next, the operation of the control section 36 having the above-described configuration will be explained. It is now assumed that the power supply unit 56 is supplying the required operating power to the control unit 36 and its peripheral circuits.

At this time, if setting data is input from the conversion rate setting device 38 and the infusion flow rate setting device 4° according to the conditions of the infusion set to be used, this setting data is stored in the RAM 46 via the switch input circuit 54 and the I10 port 48. be remembered. 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 flow rate of the #1 liquid, which will be described later. Predetermined status data used in the process is stored.

In the above state, when the power switch 62 is turned off, power is no longer supplied to the control unit 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 also sends a function stop signal to the RAM 46.

The battery 66 supplies power for data retention to the RAM 46. As a result, RAM4
Data stored in 6 is retained for a long period of time.

Next, when the power switch 62 is turned on when using the infusion pump, power is supplied to the control unit 36 and the CPU 4
2 is released and the RAM 46
The function stop signal for the infusion pump is also canceled, the program written in the ROM 44 is executed, and initial settings are made for starting the motor drive circuit 34 for operating the infusion pump.

Therefore, a program stored in the ROM 44 for performing initial settings upon starting the motor drive circuit 34 described above is set, for example, as shown in FIG. 3. In this case, ROM444j, t, import? a :aJl トL te1
00 ml/h, and 15 drops/ml is stored as state data as a conversion rate for the number of drops and volume. At first, RAM
The infusion flow rate stored in 46 is compared to see if it is less than 1 ml/h, and then compared to see if it is less than 400 [111/h. In this way, if the infusion flow rate satisfies all of these conditions, the setting data is initialized as is. However, if the infusion flow rate does not satisfy the conditions, the infusion flow rate of 100 rnl/h in the state data stored in the ROM 44 is initialized. Next, the number of infusions stored in the RAM 46 and the conversion rate of the volume are compared to see if they are 10 drops/mouth 11 or more, and then compared to see if they are 65 drops/ml or less. 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 conversion rate of 15 drops/ml of the status data stored in the ROM 44 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 manually initializing the setting data when the infusion pump is used again. be able to. Note that if the infusion pump is not used for such a long time that the power of the battery 66 is almost completely discharged,
The setting data stored in the RAM 46 will be lost, but in such a case, as mentioned above,
Infusion flow rate of status data stored in OM44 100 a
nl/h and a conversion rate of 15 drops/ml are defaulted. 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.
There is no need for frequent replacement, which is advantageous in terms of maintenance.

[Effects 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, a setting device is used to set the conversion rate for the number of infusions and volume, and the infusion flow rate, and data regarding these conversion factors and infusion flow rate are stored and retained in a memory and circuit equipped with a backup power source. Therefore, the setting data can be effectively stored and held even when the power supply to the transfusion pump is stopped, for example. 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. Further, when reading out the setting data stored in the memory circuit, its validity is determined, and if it is not valid, initial setting is performed using predetermined state data stored in advance.
It is possible to ensure safety in the event of modification or loss of the setting data, and to achieve improvement in automatic control performance.

Therefore, by using the infusion pump according to the present invention as an automatic infusion device, there is no need to manually set the setting data each time for basic drive control, and the infusion pump can always be set appropriately. Although the preferred embodiment of the present invention has been described above, the preferred embodiment of the present invention has been described above. It goes without saying that the invention is not limited to the embodiments described above, and that various design changes can be made without departing from the spirit of the 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, FIG. 3 is a flowchart showing an example of a program for determining suitability of setting data by the control section shown in FIG. 2. 10... Infusion tube 12... Finger member 1
4... 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 setter 40.
... Infusion flow rate setting device 42 ... CPU 44
...ROM46...RAM48...
・I10 boat 50...Drop number data input circuit 54...Switch input circuit 56...Power supply unit 58...Commercial power supply 60・
...Power switch 62...Voltage detector 64...
Voltage drop detection circuit 66... battery

Claims (2)

[Claims] (1) Equipped with a pump mechanism that sequentially presses and closes the infusion tube to send liquid, and a drip sensor that detects the number of drops in the drip tube provided on the infusion tube upstream of the pump mechanism, and provides feedback on the number of drops. In an infusion pump configured to control the drive of a pump mechanism by a control method, a setting device is provided to set a conversion rate for the number of infusions and a volume, and an infusion flow rate, respectively, and data regarding these conversion factors and infusion flow rate is stored. A memory circuit equipped with a backup power supply and an arithmetic control circuit that retains the data stored in the memory circuit when power to the infusion pump is stopped and automatically performs initial settings based on the data when power supply to the infusion pump is started are provided. An infusion pump characterized by: (2) The memory circuit is configured with RAM, and the arithmetic control circuit is configured with ROM and CPU, and when the voltage drop of the power supply unit that supplies power is detected, the CPU is reset and the RAM is configured.
A voltage drop detection circuit is provided to stop the function of the infusion pump, and furthermore, when power supply to the infusion pump is started, the validity of the data stored in the RAM is determined, and if the data is valid, initialization is performed using the data, and if the data is invalid. 2. The infusion pump according to claim 1, further comprising a control program that performs initial settings using predetermined status data set in advance in a ROM.