JPH11188011A - Apparatus for determing cardiac output - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the operation for determining cardiac output and the injection of a diliuent easier. SOLUTION: The apparatus for determining cardiac output consists of a fixed type patient monitor device 1, a potable type simple monitor 2, and a serial circuit set between the patient monitor device 1 and the simple monitor 2. The patient monitor device 1 has a blood sensor 11 which detects a blood temperature of patient and a cardiac output determination apparatus control circuit 14 which calculates a cardiac output based on the data detected at the blood sensor and does double-throw communication to the simple monitor 2. The simple monitor 2 has a serial input/output control circuit which does double- throw communication to the patient monitor device 1, a blood temperature display control circuit 24 which calculates and displays the variation based on the blood temperature received from the patient monitor device 1, and a blood temperature display 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cardiac output measuring device, and more particularly to a cardiac output measuring device for measuring cardiac output by a thermodilution method.

[0002]

2. Description of the Related Art In an intensive care unit for performing high-level intensive treatment of a patient, or in a catheter test room for inserting a flexible tube (catheter) into a blood vessel and examining and diagnosing a deep part of a body, the heart is used in the heart. As a means for performing a function test, a cardiac output (amount of blood delivered from the heart per unit time) of a patient is measured. Furthermore, a thermodilution method has been conventionally used as one of the specific methods for performing such a cardiac output measurement. In this thermodilution method, a certain amount of a liquid (diluent) that does not affect the biological function of a patient is injected into a patient's artery in a predetermined amount at a known temperature, and the temperature of the blood over time. The cardiac output is measured by examining the temporal changes. Conventionally, there is a dedicated device for measuring cardiac output as a means for measuring cardiac output, but in addition to these, there are many sophisticated patient monitoring devices having a cardiac output measuring function added. It has been commercialized.

[0003]

However, in the cardiac output measuring device additionally provided in the above-mentioned patient monitoring device, the operation is complicated because the patient monitoring device itself has a high function, and it is generally used. Because it was created for a specific purpose, a deep operation must be performed to measure cardiac output. Therefore, it is inevitable that the operation of cardiac output measurement is complicated, and there is a drawback that handling is difficult. In addition, in the case of a cardiac output measurement device additionally provided to the patient monitoring device, generally,
Patient monitoring devices are often stationary, but in this case, when the operator performs diluent injection near the patient, the patient monitoring device cannot monitor the required patient status. Therefore, there is a disadvantage that the operation of injecting the diluent is difficult.

The present invention has been made in view of the above circumstances, and provides a cardiac output measuring apparatus in which the operation for measuring the cardiac output is easy and the operation for injecting the diluent is easy. It is intended to provide.

[0005]

According to a first aspect of the present invention, there is provided a cardiac output measuring apparatus comprising: a blood sensor for detecting a blood temperature of a living body; A first device including a measurement control unit that calculates a cardiac output based on data of the detected blood temperature and notifies the second device of the blood temperature; and a first device. A communication control means for performing communication between the communication apparatus and a blood temperature display means for calculating and displaying a change value from the blood temperature received from the first device via the communication control means.
And a communication line provided between the first device and the second device.

According to a second aspect of the present invention, there is provided the cardiac output measuring apparatus according to the first aspect, wherein the measurement control means generates a status signal indicating the success or failure of the cardiac output measurement to generate a second output. It has a function of notifying the device.

According to a third aspect of the present invention, there is provided the cardiac output measuring device according to the first or second aspect, wherein the first device is a patient monitoring device.

According to a fourth aspect of the present invention, there is provided the cardiac output measuring device according to the first, second, or third aspect, wherein the second device comprises:
An instruction for starting cardiac output measurement is issued to the first via the communication control means.
And a status display means for displaying the status signal received via the communication control means.

The invention according to claim 5 is the invention according to claims 1, 2, 3
Alternatively, in the cardiac output measuring apparatus according to 4, the blood temperature display means includes a plurality of indicator lights, and is configured to turn on a number of indicator lights that change according to the change amount of the blood temperature. It is characterized by:

According to a sixth aspect of the present invention, there is provided the cardiac output measuring apparatus according to the fourth or fifth aspect, wherein the status display means includes a plurality of indicator lights, and different colors are provided according to the contents of the status signal. Is turned on.

According to a seventh aspect of the present invention, there is provided the cardiac output measuring apparatus according to the fifth or sixth aspect, wherein the indicator light is formed of an LED.

According to an eighth aspect of the present invention, there is provided the cardiac output measuring device according to any one of the first to seventh aspects, wherein the second device is a portable device. .

According to a ninth aspect of the present invention, there is provided the cardiac output measuring apparatus according to any one of the first to eighth aspects, wherein the communication line is a serial line.

The invention described in claim 10 is the same as the claim 9.
According to the cardiac output measurement device described above, the serial line,
It is characterized by an RS232C line.

[0015]

According to the structure of the present invention, a first device for measuring cardiac output (for example, a stationary patient monitoring device);
A second device (for example, a portable simple monitor) that only operates a cardiac output measurement start instruction and displays a change value of blood temperature
Are connected via a communication line, the operator, at the time of cardiac output measurement, monitors the change in the blood temperature of the patient by the second device near the patient while injecting the diluent. Can be performed, and the subsequent progress can be observed. Therefore, the operation for measuring the cardiac output is simple, and the operation for injecting the diluent is also easy.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. The description will be made specifically using an embodiment. FIG. 1 is a block diagram showing an electrical configuration of a cardiac output measuring device according to one embodiment of the present invention.
FIG. 3 is a perspective view showing a mechanical external configuration of a simple monitor constituting the cardiac output measuring apparatus, and FIG. 3 is a view showing a display example of a blood temperature display constituting the simple monitor. As shown in FIG. 1, a cardiac output measuring device of this example is a patient monitoring device 1 which is usually installed at a place away from a patient (subject).
And a simple monitor 2 placed beside the patient, and a serial line 3 connecting the patient monitor 1 and the simple monitor 2. First, the electrical configuration of the patient monitoring device 1 will be described. As shown in FIG. 1, the patient monitoring device 1 generally includes a blood sensor 11, a living body input amplifier 12, operation keys 13, a cardiac output measurement control circuit 14, and a display 15. . The blood sensor 11 is inserted into a blood vessel of a patient, detects blood temperature, blood pressure, and the like, and outputs the data as biological data. The biological input amplifier 12 amplifies biological data from the blood sensor 11 with a predetermined gain. The operation key 13 is operated to generate an instruction signal for setting the patient monitoring device 1 in the cardiac output measurement state. The cardiac output measurement control circuit 14 has a function of performing bidirectional communication with the simple monitor 2, and outputs a signal from the biological input amplifier 12 when receiving a cardiac output measurement start instruction signal from the simple monitor 2. The calculated blood temperature data is sent to the simple monitor 2, the cardiac output is calculated based on the blood temperature data, and displayed on the display 15 based on the calculation result. Is transmitted to the simplified monitor 2 indicating the success or failure of the measurement.

Next, the electrical configuration of the simple monitor 2 will be described. As shown in FIG. 1, the simple monitor 2 includes a serial input / output control circuit 21, a measurement start switch 22, a measurement start recognition circuit 23, A temperature display control circuit 24, a blood temperature display 25, a status display control circuit 26,
It is roughly composed of a status display 27. The serial input / output control circuit 21 communicates with the patient monitor 1
Perform two-way communication. By operating this switch, the measurement start switch 22 is brought into a state of instructing the start of the cardiac output measurement. The measurement start recognition circuit 23 recognizes the measurement start instruction state of the measurement start switch 22 and sends a cardiac output measurement start instruction signal to the patient monitoring device 1 via the serial input / output control circuit 21. The blood temperature display control circuit 24 calculates a change value of the blood temperature according to the blood temperature data from the patient monitoring device 1 via the serial input / output control circuit 21 and sends it to the blood temperature display 25. The blood temperature indicator 25 visually displays the input data of the blood temperature change value. The status display control circuit 26 outputs status information to be displayed on the status display 27 according to the measurement status signal from the patient monitoring device 1 via the serial input / output control circuit 21. The status display 27 visually displays the input status information.

Next, the operation of the cardiac output measuring apparatus having the above-mentioned configuration will be described with reference to FIG. By operating the operation key 13 in the patient monitoring device 1, the patient monitoring device 1 enters the cardiac output measurement state, and the cardiac output measurement control circuit 14 recognizes the measurement start instruction from the simple monitor 2 and Then, the blood temperature data and the measurement status signal can be transmitted to the simple monitor 2. In this state, on the side of the simple monitor 2, a treatment for injecting the diluent into the patient is performed. The output signal of the stroke volume measurement start
The signal is output to the serial line 3 via the serial input / output control circuit 21. In the patient monitoring device 1, when receiving a measurement start instruction from the simple monitor 2 via the serial line 3, the cardiac output measurement control circuit 14 determines the blood temperature from the blood sensor 11 previously attached to the blood vessel of the patient. The blood temperature data obtained by subjecting the signal to a predetermined amplification through the biological input amplifier 12 is transmitted to the simple monitor 2 via the serial line 3. Thereby, in the simple monitor 2, the serial input / output control circuit 21
Is input to the blood temperature indicator control circuit 24. The blood temperature display control circuit 24 calculates a change value of the blood temperature from the start of the measurement based on the input blood temperature data, and outputs the calculated value to the blood temperature display 25. As a result, the blood temperature indicator 25 visually displays the change of the blood temperature change value over time in real time.

Further, in the patient monitor 1, the cardiac output measurement control circuit 14 calculates the cardiac output. The cardiac output is calculated in advance from the transition of the blood temperature change value after a predetermined time has elapsed when a predetermined amount of diluent at a known temperature (usually set at a temperature lower by about 2 ° C. than the body temperature) is infused. Calculated by comparing to the desired result. The cardiac output thus determined is displayed on the display 15.
Is displayed in. On the other hand, the cardiac output measurement control circuit 14
When calculating the cardiac output in the above, if it is determined that there is an error in the cardiac output measurement due to malfunction of the device or abnormal value of the measured blood temperature, etc. A status signal is output, and if there is no such error, a measurement status signal indicating successful cardiac output measurement is output and sent to the simple monitor 2 via the serial line 3. In the simple monitor 2, the serial input / output control circuit 21
The measurement status signal received via the above-mentioned is input to the status display control circuit 26. The status display control circuit 26 outputs to the status display 27 information on the success or failure of the cardiac output measurement indicated by the measurement status signal. Thereby, in the status display 27,
The success or failure of the cardiac output measurement is visually displayed.

Next, the mechanical configuration of the simple monitor will be described with reference to FIG. The simple monitor 2 in this example is portable and is connected to the patient monitoring device 1 by a cable including an RS-232C serial line 3.
On the operation surface, a measurement start switch 22 and a blood temperature display 2
5 and a status indicator 27 are provided. The measurement start switch 22 is composed of a key switch or the like, and when the switch is turned on, an instruction to start the cardiac output measurement is issued. The blood temperature indicator 25 has a plurality of LEDs (ligh
It has a light emitting diode (light emitting diode), and displays the amount of change in blood temperature after injecting the diluent in real time by increasing or decreasing the number of LEDs that light according to the magnitude of the change in blood temperature. The status display 27 has, for example, red and blue LEDs, and turns on the red LED if the measurement fails and turns on the blue LED if the measurement is successful, according to the status of the cardiac output measurement result. It has become.

Next, referring to FIG. 3, a display example of the blood temperature indicator having the above configuration will be described. In the figure, (a), (b), (c), and (d) illustrate the display of the blood temperature indicator 25 corresponding to different blood temperature change values, and the hatched portions are lit. Represents an LED. Immediately after infusion of the diluent at the time of cardiac output measurement, there is no change in blood temperature, and the display of the blood temperature indicator 25 is in a state where all the LEDs are turned off as shown in FIG. I have. When the blood temperature is lower by 0.2 ° C. than at the time of injecting the diluent, the lower _two LEDs 25 ₁ and 25 ₂ are lit as shown in FIG. It is in a state. 0.5 ° C blood temperature than at the time of diluent injection
In the lowered state, the display of the blood temperature indicator 25 indicates the lower five LEDs 25 ₁ , 25 as shown in FIG.
_2, ..., it is in a state in which 25 ₅ is turned on. When the blood temperature is lower by 1.2 ° C. than at the time of injecting the diluent, the blood temperature indicator 25 indicates the lower 12 LEDs 25 ₁ , 25 ₂ ,..., As shown in FIG. 25 ₁₂ is lit.

As described above, according to the configuration of this example, only the stationary patient monitoring device for measuring the cardiac output, the operation of the instruction to start the cardiac output measurement, and the display of the change value of the blood temperature are performed. Since the portable simple monitor to be performed is connected via a communication line, when measuring cardiac output, the operator monitors the amount of change in the blood temperature of the patient with the simple monitor and performs the diluent injection treatment. And observe the progress thereafter. Therefore, the operation for measuring the cardiac output is simple and the operation for injecting the diluent is easy. Furthermore, the number of LEDs illuminated on the blood temperature indicator 25 increases or decreases in real time in accordance with a change in blood temperature after the injection of the diluent, and such a display is updated, for example, every one second. It is possible to grasp at a glance the transition of the change value of the blood temperature at the time of measuring the volume of the output. In addition, since the success or failure of the cardiac output measurement can be confirmed by the color of the display, the quality of the measurement result can be immediately known.

Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. Even this is included in the present invention. For example, the cardiac output measurement device is not limited to the combination of the patient monitoring device and the simple monitor, and may be configured by the combination of the dedicated stationary control unit having only the function of the cardiac output measurement and the simple monitor. good. The blood temperature display and the status display are not limited to the LED display, but may be a liquid crystal display or an EL (electro luminescenc).
e: electroluminescence) A display may be used. Alternatively, an indicator using an incandescent lamp may be used. The display of the blood temperature measurement result may also be displayed on the patient monitoring device 1 side. The serial line between the patient monitor 1 and the simple monitor 2 is RS-232C
The present invention is not limited to this, and other types of serial transmission lines may be used.
Further, the communication line is not limited to a serial line, and may be a parallel line. Further, the measurement start switch is not limited to the key switch, but may be a push button switch.

[0025]

As described above, according to the configuration of the present invention, the first device for measuring the cardiac output with low mobility, the operation for instructing the start of the cardiac output measurement, and the blood temperature Is connected via a communication line to the second device which only displays the change value of the second device, so that the first device is a stationary patient monitoring device (Claim 3), If the device is a portable simple monitor (claim 8), at the time of cardiac output measurement, the operator, while monitoring the change value of the blood temperature of the patient by the second device, near the patient, A diluent injection procedure can be performed, and the subsequent progress can be monitored. Therefore, the operation for measuring the cardiac output is simple, and the operation for injecting the diluent is also easy. Claims 5 and 7
According to the configuration described above, the blood temperature display means constituting the second device includes a plurality of indicator lights (for example, LEDs), and the number of lighting of the indicator lights increases or decreases according to the amount of change in blood temperature. Changes in blood temperature can be grasped intuitively in real time. Further, according to the configuration of claim 6, the status display means which similarly configures the second device includes a plurality of indicator lights, and the indicator lights of different colors are turned on according to the content of the status signal. The success or failure of the cardiac output measurement can be indicated by the LED color. Therefore, the quality of the measurement result can be immediately known.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an electrical configuration of a cardiac output measuring device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a mechanical external configuration of a simple monitor constituting the cardiac output measuring apparatus.

FIG. 3 is a diagram showing a display example of a blood temperature indicator constituting the simple monitor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Patient monitoring apparatus (1st apparatus) 2 Simple monitor (2nd apparatus) 3 Serial line (communication line) 11 Blood sensor 14 Cardiac output measurement control circuit (measurement control means) 21 Serial input / output control circuit (communication) Control means) 22 measurement start switch (measurement start notification means) 23 measurement start recognition circuit (measurement start notification means) 24 blood temperature display control circuit (blood temperature display means) 25 blood temperature display (blood temperature display means) 26 status Display control circuit (status display means) 27 Status display (status display means)

Claims (10)

[Claims] 1. A blood sensor for detecting a blood temperature of a living body, and a cardiac output is calculated based on data of the blood temperature detected by the blood sensor. A first device having a measurement control unit for notifying a temperature, a communication control unit for performing communication with the first device, and a blood temperature received from the first device via the communication control unit. A second device comprising: a blood temperature display means for calculating and displaying the change value; and a communication line provided between the first device and the second device. Output measurement device. 2. The cardiac output according to claim 1, wherein the measurement control means has a function of generating a status signal indicating success or failure of the cardiac output measurement and notifying the status signal to a second device. Quantity measuring device. 3. The cardiac output measuring device according to claim 1, wherein the first device is a patient monitoring device. 4. The communication device according to claim 2, wherein the second device notifies the first device of a cardiac output measurement start instruction via the communication control unit, and the measurement start notification unit receives the instruction via the communication control unit. 4. The cardiac output measuring device according to claim 1, further comprising status display means for displaying a status signal. 5. The apparatus according to claim 1, wherein said blood temperature display means includes a plurality of indicator lights, and is configured to turn on a number of indicator lights that change in accordance with the amount of change in blood temperature. Output measurement device according to any one of claims 1, 2, 3 and 4. 6. The status display device according to claim 4, wherein the status display means includes a plurality of indicator lights, and is configured to turn on indicator lights of different colors according to the contents of the status signal. The cardiac output measurement device according to the above. 7. The cardiac output measuring device according to claim 5, wherein the indicator light comprises an LED. 8. The cardiac output measuring device according to claim 1, wherein the second device is a portable device. 9. The cardiac output measuring device according to claim 1, wherein the communication line is a serial line. 10. The cardiac output measuring device according to claim 9, wherein the serial line is an RS232C line.