JPH062656Y2 - Patient monitor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a patient monitoring apparatus that can be used even during surgery.

[Outline of device]

The present invention relates to a patient monitoring device that can be used even during surgery.The measurement signal from the electrocardiogram electrode is supplied to a monitoring device body having an electrocardiographic amplification circuit so that the electrocardiographic waveform can be monitored and the electrocardiographic electrode can be used. In the patient monitoring device, which supplies a high-frequency signal from the high-frequency oscillator provided in the main body of the monitoring device to detect the respiratory state by the detection circuit by the impedance method provided in the above-mentioned monitoring device, removes the electrocardiographic electrode from the high frequency. The monitoring device is connected via an adapter cord with a filter, and a thermistor is connected between the high-frequency removal filter and the high-frequency oscillator so that the electrocardiogram waveform and respiration can be obtained even during surgery without the influence of an electric scalpel. The condition can be monitored.

[Conventional technology]

Conventionally, as shown in FIG. 3, there has been proposed a device for monitoring a patient's electrocardiographic waveform by using an electrocardiographic electrode as a patient monitoring device and detecting the respiratory motion of the patient by an impedance method using the electrocardiographic electrode. ing. That is, in FIG. 3, R, N, and L respectively indicate electrocardiographic electrodes attached to predetermined positions on the chest of the human body, and the electrocardiographic electrodes R, N, and L are adapter cords (1) consisting only of electric wires. To the connection terminals (2R), (2N), and (2L) of the monitoring device main body (2) via. In this monitoring device body (2), this connection terminal (2R),
The measurement signals obtained at (2N) and (2L) are supplied to the electrocardiogram amplification circuit (2a), and the electrocardiogram signal obtained at the output terminal (3) of this electrocardiogram amplification circuit (2a) is supplied to a monitor (not shown). However, this monitor can monitor the electrocardiogram waveform.

Also, (4) is 50kHz to 100kHz provided in the main body of the monitoring device (2).
Shows a high-frequency oscillator for generating a sine wave signal of 50 kHz to 100 kHz on the chest of the human body between the electrodes N and L for electrocardiogram from the high frequency oscillator (4) via the adapter cord (1), for example, about 100 μA Flow this high frequency oscillator (4)
The detection circuit (5) according to the impedance method installed between the transmission lines of the high frequency signal extracts the fluctuation of the rib cage due to the respiratory movement as an electrical impedance change and obtains it at the output terminal (5a) of this detection circuit (5). The detection signal is supplied to the monitor to monitor the respiratory condition. In this case, there is a relatively good correlation between the change in the lung volume and the change in the impedance of the lung, and a respiratory curve can be measured in addition to the respiratory rate.

Therefore, in the patient monitoring apparatus as shown in FIG. 3, it is possible to monitor the respiration state at the same time as the electrocardiographic waveform by using the electrocardiographic electrodes R, N, L and the adapter cord (1) together.

[Problems to be solved by the device]

When such a patient monitoring apparatus as shown in FIG. 3 is used in an operating room, there is a disadvantage that it cannot be used because a noise of about several tens of kilohertz to several tens of megahertz is generated due to the electric knife during the surgery. Therefore, as shown in FIG. 4, the electrodes R, N, L for the electrocardiogram are connected to the connecting terminals (2R), (2N) and the connecting terminals (2R) and (2N) of the monitoring device main body (2) through an adapter cord (6) having a high frequency removing filter (6a). It was connected to (2L) and the high frequency noise of the electric scalpel during surgery was removed by this high frequency removal filter (6a), and the electrocardiogram waveform was monitored.

However, when using the adapter cord (6) having this high-frequency removal filter (6a), the high-frequency signal for respiration detection that depends on the high-frequency signal is also removed by this high-frequency removal filter (6a) from the high-frequency oscillator (4) that monitors the respiratory condition. There was an inconvenience because it was impossible to monitor the respiratory condition that was especially required during surgery.

The present invention has been made in view of the above circumstances, and an object thereof is to obtain a patient monitoring apparatus capable of simultaneously monitoring an electrocardiogram waveform and a respiratory state even during surgery.

[Means for Solving the Problems]

The patient monitor according to the present invention can monitor the electrocardiogram waveform by supplying the measurement signals from the electrocardiogram electrodes R, N and L to the monitor body (2) having the electrocardiogram amplification circuit (2a) as shown in FIG. In addition, a high-frequency signal from the high-frequency oscillator (4) provided in the monitoring device body (2) is supplied to the electrocardiographic electrodes R, N, L, and a detection circuit by the impedance method provided in the monitoring device body (2). In a patient monitoring device in which the respiratory condition is known by (5), the monitoring device main body (2) is connected to the electrocardiographic electrodes R, N, L via an adapter cord (6) having a high frequency removal filter (6a). ) And a thermistor (7) between the high-frequency removal filter (6a) and the high-frequency oscillator (4) so that the electrocardiogram waveform and respiratory status can be monitored during surgery. It is a thing.

[Action]

According to the present invention, electrodes R, N, L for electrocardiogram in an operating room
Adapter cord (6) with high-frequency elimination filter (6a)
Since it is connected to the monitoring device body (2) via the, it is possible to monitor the electrocardiogram waveform without being affected by the high frequency noise due to the electric knife, and the thermistor (7) between the high frequency elimination filter (6a) and the high frequency oscillator (4). When attached to this patient's nose or respiratory mask and the high-frequency signal from the high-frequency oscillator (4) is supplied to this thermistor (7), the impedance of this thermistor (7) changes due to temperature changes due to respiratory airflow, so this Circuit to detect patient's respiratory condition by impedance method
It can be detected by (5).

〔Example〕

An embodiment of the patient monitoring apparatus of the present invention will be described below with reference to FIG.

In FIG. 1, parts corresponding to those in FIGS. 3 and 4 are designated by the same reference numerals, and detailed description thereof will be omitted.

Also in this example, the monitoring device body (2) transmits the measurement signals obtained at the connection terminals (2R), (2N), (2L) to the electrocardiogram amplification circuit (2a) as in the examples of FIGS. 3 and 4. ), And the electrocardiographic signal obtained at the output terminal (3) of the electrocardiographic amplification circuit (2a) is supplied to a monitor (not shown) so that the electrocardiographic waveform can be monitored by this monitor.

In addition, a high frequency oscillator (4) that generates a sine wave signal of 50 kHz to 100 kHz is provided in the monitoring device body (2).
Connection terminal (2N) from (4) via DC blocking capacitor
This high frequency signal is supplied between and (2L). In this case, when the adapter cord (1) consisting of an electric wire is arranged between the electrocardiogram electrodes R, N, L and the connection terminals (2R), (2N), (2L), the chest of the human body between the electrocardiogram electrodes N and L 50kHz to 100kHz
A minute sine wave current of, for example, a current of about 100 μA flows. Further, a detection circuit (5) by the impedance method is provided between transmission lines of high frequency signals from the high frequency oscillator (4) of the monitoring device body (2). The detection circuit (5) by this impedance method extracts the fluctuation of the rib cage due to human respiratory movement as an electrical impedance change, and supplies the detection signal obtained at the output terminal (5a) of this detection circuit (5) to the monitor. , Is designed so that the respiratory condition can be monitored.

In this example, the connection terminals (8a) and (8b) for connecting the thermistor (7) are connected in parallel to the input terminals (2N) and (2L) of the monitoring device body (2) through a DC blocking capacitor. ) Is provided. The other parts of the monitoring device body (2) are constructed in the same manner as in the conventional case.

In this example, when used in a hospital room other than an operating room, the electrodes R, N, and L for electrocardiography are attached to the patient's chest at predetermined positions.
As shown in FIG. 3, an adapter cord (1) consisting of only an electric wire is used to connect the connection terminal (2R), (2N) and (2L) of the monitoring device body (2) to the connection terminal. At this time, the electrocardiographic electrodes R, N,
The measurement signal from L is supplied to the electrocardiogram amplification circuit (2a), and the electrocardiogram waveform can be monitored by the electrocardiogram signal obtained at the output terminal (3) of the electrocardiogram amplification circuit (2a) and a high-frequency oscillator
The high-frequency microcurrent from (4) is supplied between the electrocardiographic electrodes N and L of the patient's chest, and the fluctuation of the chest accompanying the respiratory movement of the patient is detected by the impedance detection circuit (5) as a change in electrical impedance. Can be removed and monitored for respiratory status. In this case, there is a relatively good correlation between the change in the lung volume and the change in the impedance of the lung, and the respiratory rate and the respiratory curve can be measured. Therefore, at this time, the electrocardiographic electrodes R, N, L and the adapter cord
Respiratory status can be monitored simultaneously with the electrocardiogram waveform by using (1) together.

When used in the operating room in this example, as shown in FIG. 1, an electrocardiographic electrode R attached to a predetermined position on the patient's chest,
Connection terminals (2R), (2N) and (2) between N and L and the monitoring device body (2)
L) and an adapter cord with a high frequency elimination filter (6a)
(6) and the thermistor (7) is attached to the nose or respiratory mask of this patient, and one end and the other end of this thermistor (7) are connected to the monitoring device body (2) via lead wires respectively. Connect to terminals (8a) and (8b).

At this time, the measurement signals from the electrocardiographic electrodes R, N, L are supplied to the electrocardiographic amplifier circuit (2a) via the high frequency elimination filter (6a), so that the electrocardiographic waveform without the influence of high frequency noise due to the electric knife can be monitored. Along with this, a high frequency signal from the high frequency oscillator (4) is supplied to this thermistor (7), and the impedance of this thermistor (7) changes due to temperature changes due to respiratory airflow, and the detection circuit (5 ) And can be monitored by monitoring this. In this case, high-frequency oscillator (4) and detection circuit by impedance method
(5) can be used as it is without any change.

Therefore, according to this example, there is an advantage that the electrocardiogram waveform and the respiratory condition can be monitored even in the operating room without the influence of the high frequency noise of the electric scalpel. Further, in the above example, since the adapter cord (1) made of an electric wire and the adapter cord (6) having the high frequency elimination filter (6a) can be arbitrarily used as necessary, the best monitoring benefit can be obtained. is there.

FIG. 2 shows another embodiment of the present invention, in which the thermistor (7) is provided in advance in the adapter cord (6) having the high frequency removing filter (6a). ,
In the example shown in FIG. 2, a DC blocking capacitor is inserted between the wires connected to the connection terminals (2N) and (2L) of the monitoring device body (2) on the output side of the high frequency elimination filter (6a). The thermistor (7) is connected. Others are third
The configuration is similar to that shown in FIGS.

Also in the second example, the measurement signals from the electrocardiographic electrodes R, N and L are supplied to the electrocardiographic amplifier circuit (2a) via the high frequency elimination filter (6a) and the high frequency oscillator (4). It can be easily understood that a high frequency signal is supplied to the thermistor (7), so that the same effect as that of the example of FIG. 1 can be obtained.

Further, in the example of FIG. 2, the high frequency removing filter (6
Of course, it is possible to monitor the electrocardiogram waveform and respiratory condition by using the adapter cord (1) consisting of an electric wire by switching to the adapter cord (6) having a).

Of course, the present invention is not limited to the above-described embodiments, and various other configurations can be taken without departing from the gist of the present invention.

[Effect of device]

According to the present invention, there is an advantage that an electrocardiogram waveform and a respiratory condition can be well monitored in an operating room without being affected by high frequency noise caused by an electric scalpel.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the patient monitoring apparatus of the present invention,
FIG. 2 is a block diagram showing another embodiment of the present invention, and FIGS. 3 and 4 are block diagrams showing an example of a conventional patient monitoring apparatus. (2) is the monitoring device body, (2a) is an electrocardiogram amplifier circuit, (3) is an output terminal, (4) is a high-frequency oscillator, (5) is a detection circuit by the impedance method, (6) is an adapter cord, (6a) Is a high frequency removing filter, (7) is a thermistor, and R, N and L are electrocardiographic electrodes.

Claims (1)

[Scope of utility model registration request] 1. A measuring signal from an electrode for electrocardiogram is supplied to a monitoring device body having an electrocardiographic amplification circuit so that an electrocardiographic waveform can be monitored, and at the same time, a high frequency oscillator provided on the monitoring device body for the electrocardiographic electrode is used. Supply high frequency signals,
In a patient monitoring device in which a respiratory condition is detected by a detection circuit based on the impedance method provided in the monitoring device body, the electrocardiogram electrode is connected to the monitoring device body via an adapter cord having a high frequency removing filter. In addition, a thermistor is connected between the high frequency removing filter and the high frequency oscillator so that the electrocardiogram waveform and respiratory state can be monitored during surgery.