JPH0542216A - Inspection circuit of transfusion equipment - Google Patents

Abstract

PURPOSE:To provide an inspection period during the display period of a seven- segment display. CONSTITUTION:There are provided a column buffer 32 connected to the common terminal of a seven-segment display 31, eight low buffers 33 and eight pull up resistors 34 connected to the segment terminals of the display 31 respectively, eight comparators 35 in which each non-inversion input terminal is connected to each segment terminal, and current-limiting resistors 36. A bank signal (BANKn signal) is inputted to the column buffer 32. a, b, c. d, e, f, g, dp signals are inputted to the eight low buffers 33 during a display period. Binary logic 'L' is inputted to tire eight low buffers 33 during an inspection period. Each pull up resistor 34 works with the corresponding comparator 35 to inspect the presence or the absence of the disconnection of the corresponding LED 31 during the inspection period.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inspecting circuit for an infusion device for injecting various kinds of liquid medicine or blood into a human body by using a syringe.

[0002]

2. Description of the Related Art Conventionally, there is known an infusion device in which a syringe sucking up a drug solution is attached to a syringe type pump, and the sucker of the syringe is pressed at a constant speed by a slider to automatically infuse the solution. ing. This infusion device is disclosed in Japanese Unexamined Patent Publication No. 48-62289 and Japanese Utility Model Laid-Open No. 57-
It is disclosed in Japanese Patent No. 76637 and Japanese Patent Publication No. 63-44390.

In this type of infusion device, a 7-segment indicator is normally used to indicate the infusion amount, but the infusion amount must always be accurate because of the human life. Therefore, it is necessary to always inspect the disconnection or the deterioration of the display of each of the 7 segments, but the conventional display inspection method displays 8 which is the operating state of all the segments before use. If it is shown, it was judged that there was no abnormality in the segment.

[0004]

However, in the case of this inspection method, there is a drawback that only the first inspection can be performed and the subsequent inspections cannot be performed. On the other hand, there are some that always inspect the 7-segment display and immediately give an alarm if there is any inconvenience. In this case, even if the segment operating for the display can be inspected, it is not necessary to display the segment. There was a defect that could not be inspected.

In view of the above circumstances, it is an object of the present invention to provide an inspection circuit for an infusion device in which an inspection period is provided during the display period of a 7-segment display.

[0006]

SUMMARY OF THE INVENTION An infusion device inspection circuit according to the present invention comprises a column buffer connected to a common terminal of a segment display and a plurality of rows connected to a plurality of segment terminals of the segment display. A buffer,
A plurality of pull-up resistors connected to each segment terminal and a plurality of comparators connected to each segment terminal are provided.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an infusion device 1 according to an embodiment of the present invention.
Is shown. The case 2 of the infusion device 1 includes an operation unit 4 for monitoring the infusion operation of the syringe 3 and the infusion state.
And a mounting part 5 to which the syringe 3 can be mounted. First, the syringe 3 has, for example, a total volume of 10 depending on the application.
Standard products of mm, 20 mm, 30 mm and 50 mm are used, and therefore have an outer diameter corresponding to the standard.

Further, the operation unit 4 has a capacity indicator 6 for displaying the size of the mounted syringe 3 by, for example, a 7-segment LED, and a centralized indicator 7 for displaying various operating states.
, Infusion start indicator 8, infusion stop indicator 9, and 4-digit 7-segment numerical value display for displaying flow rate during infusion, cumulative flow rate or one-shot flow rate in ml / hr (hour) or ml unit And the container 10 are arranged.

The centralized indicator 7 is a self-diagnosis indicator 7a for instructing that the self-diagnosis program is in operation, and a clogging / opening indicator that lights up due to an abnormality during transfusion, such as clogging or detachment of the injection needle, after the elapse of this predetermined time. Device, a low-voltage indicator that indicates that the built-in secondary battery has reached the usage limit, an operation forget indicator that indicates a mistake in the operating procedure, an infusion completion indicator that indicates infusion completion, and an infusion completion And a standby indicator for indicating one minute before.

The operation portion 4 is further provided with a one-shot button 1 capable of sending a larger amount of infusion liquid than a normal infusion amount in an emergency.
1, an infusion amount button 12 for selecting the display contents of the numerical display 10, an infusion start / stop button 13, an air bleeding fast forward button 14, and a power button 15. Furthermore, above and below the numerical display 10, flow rate setting buttons 16 for setting the flow rate for each digit are arranged. These flow rate setting buttons 16 can be set between 0.0 and 199.9 ml per hour. Further, the sucker in the empty syringe 3 is pressed at a constant speed, the pressing force at this time is regarded as a pressure loss, and the learning function setting button 17 or the buzzer stop button (not shown) which is stored in the pressure loss coefficient device is stored. ) Is also placed.

The mounting portion 5 has a mounting portion 22 on which the outer cylinder 21 of the syringe 3 is mounted, a slider 24 capable of pressing a sucker 23 slidably moving in the syringe 3, and a slider 24 as shown in FIG. A drive mechanism 25 for driving the slider 24 in the direction of the mounting portion 22 (direction of arrow a) while supporting the slider 24. First, the mounting part 22 is provided with a holding part 26 for fixing the mounted syringe 3 from above, and a syringe diameter detector 27 arranged under the holding part 26. Also,
For the slider 24, the drive mechanism 25 is released and the slider 2
A release button 28 for returning 4 to the original position is provided, and a part of the drive mechanism 25 is covered with a bellows 29 so that the inside cannot be seen.

Therefore, in the pump provided with the syringe 3 and the sucker 23, the syringe 3 is held by the holding portion 26 and the sucker 2 is held.
The rear end of the slider 3 contacts the slider 24. A flexible infusion pipe (not shown) communicating with the injection needle is connected to the tip of the syringe 3. Therefore, the syringe 3 is mounted on the mounting portion 22.
When the slider 24 is pushed by the drive mechanism 25 in the direction of the arrow a at a predetermined speed, the drug solution in the syringe 3 is pushed out at a predetermined flow rate and is passed through the infusion pipe and the injection needle. Injected into the patient.

In such an infusion device 1, in FIG. 3, the size of the mounted syringe 3 is 7 segment LE.
The volume indicator 6 indicated by D and the 4-digit 7-segment numerical indicator 10 for indicating the flow rate during infusion, the cumulative flow rate or the one-shot flow rate in ml / hr (hour) or ml unit are respectively driven. , A test circuit 30 for testing is shown.

In this figure, this inspection circuit 30 includes five cathode common type 7-segment LED indicators 31 for displaying the capacity standard and setting or infusion volume of the syringe 3.
Five column buffers 32 (only one is shown) connected to the common terminals (only one shown) and eight column buffers 32 connected to the plurality of segment terminals of these 7-segment displays 31 respectively. It comprises a row buffer 33, eight pull-up resistors 34 connected to each segment terminal, and eight comparators 35 each non-inverting input terminal connected to each segment terminal. A current limiting resistor 36 is connected to each LED 31 in series with the anode terminal.

These 7-segment indicators 31 are a, b, c, in the case of a cathode common 7-segment LED.
It has a common terminal in which eight cathode electrodes for displaying d, e, f, g, and dp (dot point) segments are commonly connected, and segment terminals respectively connected to corresponding anode electrodes.

For each column buffer 32, for example, an emitter-grounded NPN transistor or a source-grounded N-channel MOSFET whose ON / OFF is controlled by a bank signal (BANKn signal: n = 0 to 4) is used. on the other hand,
Each row buffer 33 has a, b, c,
An emitter follower NPN transistor to which a corresponding signal among the d, e, f, g, and dp signals is input is used.
These input signals are lowered to binary logic "L" during the test period. The NPN transistor of each emitter follower can be replaced with a PNP transistor whose emitter is grounded to +5 volts, for example. In this case, during the display period,
Inverted signals of the a, b, c, d, e, f, g, and dp signals are input, and each input signal is raised to binary logic "H" during the inspection period.

Each pull-up resistor 34 has a corresponding comparator 3.
In cooperation with 5, the LED is inspected for normality or disconnection during the inspection period. Therefore, during the inspection period, the low buffer 3
No power is supplied to turn on each segment 2 in the OFF state, but each segment is supplied with the minimum power from the corresponding pull-up resistor 34 capable of inspecting for the presence or absence of disconnection. If any segment of the LED 31 is open, +5 volts is applied to the non-inverting input of the corresponding comparator 35, and if any segment of the LED 31 is normal, a predetermined voltage below +5 volts. Is applied to the non-inverting input terminal of the corresponding comparator 35.

A reference voltage Eref higher than a predetermined voltage, for example, 2.5 volts is applied to the inverting input terminal of each comparator 35, and the bank signal of bank 0 becomes "H" during the inspection period of bank 0. During the inspection period of bank n, bank n
Bank signal becomes "H". However, n is 4 in this case. Therefore, each comparator 35 sends "H or L" as a result of the presence or absence of disconnection of the corresponding segment to the I / O device of the computer system, for example, during the inspection period. Of course, I / O
In addition to the a, b, c, d, e, f, g, dp signals, the device also sends bank signals.

First, during the normal numerical value display period, the signal of bank 0 is input to the column buffer 32, and at the same time, the row buffer 33 receives a, b, and a corresponding to bank 0.
The c, d, e, f, g and dp input signals are input and are sequentially executed up to the bank 4. During the subsequent inspection period of bank 0, the signal of bank 0 is input to the column buffer 32, and “L” is input to each input of the row buffer 33 so that the inspection result is output from the comparator 35 to the I / O device. Entered in.

During the next numerical value display period, the signal of bank 0 is input to the column buffer 32, and at the same time, the row buffer 33 is supplied with a, b, c, d, corresponding to bank 0.
e, f, g, dp input signals are input, and these are bank 4
Are sequentially executed. During the subsequent inspection period of bank 1, the signal of bank 1 is input to the column buffer 32, and “L” is input to each input of the row buffer 33.
The inspection result is input from the comparator 35 to the I / O device, and the inspection period of the bank 4 is executed while sequentially repeating the numerical display. After that, the display period and the inspection period described above are alternately repeated.

[0021]

As described above, the inspecting circuit of the infusion device according to the present invention, for example, has five sets of 7 while the infusion device is in use.
Each segment of the segment display can be inspected sequentially, so the content of the numerical display always shows the correct value, eg L
Even if the segment of the ED is disconnected, it is possible to detect this promptly, issue an alarm, and obtain the advantage of being able to quickly respond.

[Brief description of drawings]

FIG. 1 is an external perspective view of an infusion device according to an embodiment of the present invention.

FIG. 2 is a partially cutaway front view of the infusion device of FIG.

FIG. 3 is a circuit diagram schematically showing an inspection circuit of an infusion device according to the present invention.

[Explanation of symbols]

 1 Infusion Device 3 Syringe 30 Inspection Circuit 31 7 Segment Display 32 Column Buffer 33 Low Buffer 34 Pull-up Resistor 35 Comparator

Claims (1)

[Claims] 1. A column buffer connected to a common terminal of a segment display, a plurality of row buffers connected to a plurality of segment terminals of the segment display, and a plurality of pulls connected to each segment terminal. A test circuit for an infusion device, comprising an up resistor and a plurality of comparators each connected to each segment terminal.