JP3169704B2 - Infusion monitor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drip monitoring device capable of monitoring a drip or a dropping state of blood, plasma, etc. in an extracorporeal circuit.

[0002]

2. Description of the Related Art Infusion pumps that perform automatic control by a motor or a mechanism using a motor so as to keep a drip volume constant have become widespread. Although an infusion monitoring device (monitor) for simply monitoring an infusion state has been filed as a prior art, it has not been put to practical use. As a device for monitoring a drip state, (a) a drip time interval is measured, calculated, and displayed as an instantaneous number of drops / minute.
(B) It is known that a plurality of drops are pooled for a certain period of time and calculated from the time between the drops and displayed as the number of drops / minute. In the above-described infusion monitor, an alarm can be issued if the target number / minute deviates, for example, by ± 20%. That is, since a certain limit value can be determined within a range of ± for the target number of drops / minute, accurate monitoring can be performed.

[0003]

In the above-described infusion monitor, an alarm can be generated when the target number of droplets per minute is, for example, ± 20% or more. That is, a certain limit value is accurately set within a range of ± for the target number of drops / minute.
However, in practice, even if it deviates slightly from ± 20% (for example, ± 20%)
(30%) Almost no problem. That is, in the alarm issuance at a constant value, the alarm frequently occurs. In this case, it is necessary to increase the limit value in order to prevent frequent alarms. However, a fine adjustment operation corresponding to the condition of the patient, the type of liquid medicine, the infusion rate (target number of drops / minute) and the like is required. Even if it is theoretically possible, the control circuit becomes complicated and practically complicated, so it is difficult.

[0004]

The present invention comprises a drip setting means, a liquid drop detection means, a counting means, a calculation section, and an alarm generating means, wherein the drip setting means is a star.
A drop unit, a timer selection unit and a reset unit.
Output means: infrared, visible, electrostatic, magnetic
It is better than a drop detector that adopts a method selected from among the methods
The counting means outputs a gate signal, a strobe signal,
Generate each signal of the pete signal and the timing of the generation of each signal.
Timing generation circuit and drop detection signal
Consists staircase wave generating unit for converting the wave, the calculation unit H /
It consists L comparing portion and the abnormal signal count unit, the alarm
The generation means consists of an error display, a buzzer, and a relay contact.
A drip monitoring device.

[0005] The present invention relates to an infusion setting unit, a counting unit, and an arithmetic unit.
The infusion monitoring device according to the above, wherein the unit and the alarm generating means are arranged in the infusion monitor main body .

[0006]

[0007]

FIG. 1 is a schematic view of an infusion monitoring apparatus 1 according to the present invention, and FIG. 2 is a block diagram (in the case of an electronic circuit) showing operating means of FIG. The apparatus 1 comprises a drop detector 2 (liquid drop detecting means) and a drip monitor main body 1a. The drip monitor main body 1a includes a drip setting means, a counting means, a calculation section, and an alarm generating means. .

The drop detector 2 (drop detecting means) can employ any method selected from an infrared method, a visible light method, a capacitance method, and a magnetic method. The infusion setting means comprises a start unit, a timer selection unit and a reset unit.

The counting means comprises a timing generating circuit and a staircase wave generating section, the arithmetic section comprises an H / L comparing section and an abnormal signal counting section, and the alarm generating means comprises an abnormal generating section and a buzzer section. And relay contacts.

The drip detector 2 may transmit a drip signal to the drip monitor main body 1a via the connection code 3, or a micro transmitter may be built in the drip detector 2 to allow wireless communication. Thus, the data can be received and processed by a receiver built in the infusion monitor main body 1a.

In the drip monitor main body 1a, as an abnormality display part of the alarm generation means, a general abnormality indicator light 4, an overdose indicator light 5, a small drop indicator light 6, an invincible / water column type drop indicator light 7, the same means. A melody buzzer 11 is formed, a start switch 13 as a start part of the infusion setting means, a setting timer changeover switch 10 as a timer selection part of the means, and a reset switch 14 as a reset part of the means. Is formed. In FIG. 1, reference numeral 8 denotes a drop indicator lamp, 9 denotes a setting timer indicator lamp, 12 denotes a power switch, and 15 denotes a null-scalp terminal.

Next, an example of a method of using the infusion monitor 1 of the present invention will be described. The power switch 12 is turned on, and the drip detector 2 is set in the drip tube (drip chamber) 22 of the infusion set 21. Timer switch 1
At 0, a desired time (second) is selected and set from, for example, 2, 4, and 8 seconds according to the target flow rate (target droplet number). The target flow rate is adjusted by the roll clamp 23 of the infusion set 21 as in the conventional case.

For example, using a general infusion set, about 1
When the infusion is performed at an infusion rate of 00 ml / hour (25 drops / min), the timer switch 10 is set to 8 seconds from Table 1 and then the start switch 13 is pressed to start the operation of the infusion monitor.

[0014]

The actual number of drops is 2 drops / set timer time (6
0 ml / hour), it becomes a small drop alarm.
The small drop indicator lamp 7 and the general abnormality indicator lamp 4 are turned on, and the melody is flown from the melody buzzer 11 (the set timer time is a time that can be varied from about 2 to 10 seconds by switching the set timer). . Conversely, if the number of drops becomes 7 drops / set timer time (210 ml / hour) or more, an overdrip alarm will occur, the overdrip indicator 5 and the general fault indicator 4 will be turned on, and the melody will flow from the melody buzzer 11. In addition, when there is no dripping and in the case of continuous dropping in a water column shape, the invincible / water column indicator lamp 7 and the general abnormality indicator lamp 4 are turned on, and the melody flows from the melody buzzer 11.

When these abnormal alarms occur, if the reset switch 14 is pressed after performing other necessary measures such as checking and re-adjusting the infusion set 21, the infusion monitor starts from the initial operation. When the drop detector 2 detects the drop of the chemical solution, the drop indicator lamp 8 is turned on. In addition, since there is a nurse scale terminal 15, when an abnormality occurs, the abnormality can be known from a nurse center.

The signal will be described with reference to the block diagram of FIG. 2 as shown in FIG. The drop detection signal (pulse) corresponds to one drop that drops on the drip chamber 22. Timing is generated when the start switch 13 is pressed
A gate signal is generated from the circuit . The pulse signal of
The pulse signal is input to the D / A converter only during the pulse width (within the time) of the gate signal, and is converted into a step-like wave. The purpose of the conversion into the staircase wave is to convert the pulse signal into a DC voltage to easily determine whether the droplet is an overdrop (H) or a small drop (L).

When the gate signal ends, the drop detection signal is no longer accepted, and the converted DC voltage maintains its value. At the same time as the end of the gate signal, a strobe signal is sent out from the timing generation circuit to determine over-drop (H) / small drop (L), and the determination result is stored. When the set number of abnormalities (H / L) is counted, the contents of the abnormalities are illuminated and displayed, and signals such as the melody buzzer 11 and the nurse call relay ON are transmitted. When the strobe signal ends
A repeat signal is generated from the timing generation circuit . This signal is for resetting the D / A converter and generating a gate signal. Hereinafter, this operation is repeatedly performed. As described above, according to the present invention, if there is a certain number of drops (2 to 6 drops / set timer time) within a certain time, it is assumed to be normal. / When the set time is longer than the set timer time, no drip or continuous drop drip occurs). In this timer setting, the number of drops within this timer setting time is viewed from a series of intermittent drops. Therefore, in actual use, it is not to accurately know the current number of drops, but to know that the infusion is performed within a certain range, which is completely different from the conventional infusion monitor.

FIG. 2 shows a case of a block diagram composed of only electronic circuits. In the present invention, however, as shown in FIG. 4 in place of an arithmetic unit comprising an H / L comparing unit and an abnormal signal counting unit in FIG. By employing a microcomputer system employing a CPU unit (RAM unit or ROM unit), it is possible to greatly reduce the number of components and downsize. The concept of operation is substantially the same as that of the electronic circuit shown in FIG.

[0020]

Operation and Effect of the Invention

(1) According to the present invention, the number of drops within a certain period of time is not counted, and the number of drops within a certain time is converted into a voltage value as a pulse number.
Side (overdrop) and L side (small drop) can be detected. In other words, reliable counting can be performed with a minimum circuit in the D / A conversion circuit. (2) Although the set number of drops within a certain period of time naturally has an upper limit, the present invention has a prohibition circuit so as not to count the number of pulses (number of drops) that exceeds the upper limit. As a result, reliable counting can be performed with a minimum circuit configuration.

(3) Since a strobe pulse for confirming the presence or absence of an abnormality on the H side and the L side is transmitted at regular intervals, if there is an abnormality, a pulse is output. The count is counted, and when the set pulse number is reached, an abnormality can be transmitted. Further, since the set pulse number can be set arbitrarily, the abnormal sending time can also be set. (4) In the case of no-dropping and dropping flow, the detection of anomalies every fixed time is the same as in H / L, but since the anomaly counting circuit is provided separately from H / L, the anomaly sending time can be set arbitrarily. (Because the abnormality is more dangerous, it is necessary to send the abnormality earlier than H / L). (5) The method of use is simple because the number of drops in a certain range is detected instead of looking at the exact number of drops. You can see the upper limit, lower limit, invincibility, columnar continuous drop.
The main body of the drip monitoring device can be downsized. If mass-produced, the price will be low.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a drip monitoring device of the present invention.

FIG. 2 is a block diagram of FIG. 1;

FIG. 3 is an explanatory diagram of a signal.

FIG. 4 is a block diagram showing another embodiment of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Infusion monitor 1a Infusion monitor main body 2 Drop detector 3 Connection code 4 General error indicator 5 Overdrip indicator 6 Small drop indicator 7 Invincible / water column type drop indicator 8 Drop indicator 9 Setting timer indicator 10 Setting timer changeover switch 11 Melody buzzer 12 Power switch 13 Start switch 14 Reset switch 15 Nascal terminal 20 Chemical liquid 21 Infusion set 22 Drip chamber (Drip chamber) 23 Roll clamp

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-90765 (JP, A) JP-A-3-231680 (JP, A) JP-A-59-103672 (JP, A) 56448 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) A61M 5/00 320 A61M 5/168

Claims (2)

(57) [Claims] 1. A drip setting means, a liquid drop detecting means,
It comprises a counting means, a calculating part, and an alarm generating means,The drip setting means resets the start section, the timer selection section,
Part, The drop detection means is an infrared type, a visible light type, a capacitance
Drop detection using a method selected from the following methods:
Consisting of The counting means includes a gate signal, a strobe signal, and a repeater.
Signal and the timing of generation of each signal
Timing generation circuit and drop detection signal as a staircase wave
It consists of a step wave generator that converts The arithmetic unit includes an H / L comparing unit and an abnormal signal counting unit.
And The alarm generating means includes an abnormality display section, a buzzer section, and a relay section.
-Consisting of contacts,  An intravenous monitoring device, characterized in that: 2. The infusion monitor according to claim 1, wherein the infusion setting means, the counting means, the calculating section, and the alarm generating means are arranged in the infusion monitor main body.