JPH0822274B2 - Medical telemeter - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medical telemeter used for wirelessly transmitting a biological signal such as an electrocardiogram of an inpatient who is permitted to move in a hospital to a nurse center for centralized monitoring. .

[0002] A medical telemeter is used to wirelessly transmit a biosignal such as an electrocardiogram of a walking patient to a nurse center for centralized monitoring at the nurse center. When a patient having such a telemeter transmitter moves out of the reception range of the receiver installed in the nurse center, normal monitoring cannot be performed. For this reason, in order to inform nurses that normal monitoring is no longer possible, the receiver detects that the electric field strength is weak and that a correct demodulated signal cannot be obtained, and sounds or CRTs are detected. A device for issuing an alarm by a display or the like is provided.

A schematic configuration of a conventional receiver of this type is shown in FIG. In FIG. 4, radio waves sent from a transmitter (not shown) on the patient side by radio are captured by the antenna 1, demodulated by the demodulation circuit 3 through the high frequency circuit 2, and processed by the processing circuit 4.
Causes the waveform and data to be displayed on the CRT or the like. Also,
When signals from the high frequency circuit 2 and the demodulation circuit 3 detect that the electric wave cutoff detecting means 5 has weakened the electric field strength or cannot obtain a correct demodulation signal, an alarm 6 is issued by sound or CRT display. It has become.

[0004]

However, according to the conventional medical telemeter constructed as described above , for example, it becomes unnecessary to monitor a patient, and when the power of the transmitter is intentionally turned off, the receiver side Therefore, it was not possible to distinguish between the case where the patient went out of the reception range and the case where the power of the transmitter was turned off. Therefore, there is a problem that an unnecessary alarm is generated on the receiver side, and a receiver that centrally monitors a plurality of patients becomes an obstacle to the monitoring of other patients who are continuing the monitoring.

The present invention has been made in view of the above points, and prevents false alarms from occurring when the power of the transmitter is intentionally turned off, thereby improving the reliability of the device and performing monitoring. An object of the present invention is to provide a medical telemeter capable of facilitating continuous monitoring of other patients.

[0006]

In order to achieve the above object, a medical telemeter according to claim 1 is a transmitter for transmitting a detected biomedical signal wirelessly, and the biomedical signal transmitted from the transmitter. A receiver for receiving the signal, a processing circuit for processing and displaying the biological signal received by the receiver, and a radio wave cutoff detecting means for detecting a radio wave cutoff of a radio signal emitted by the transmitter and issuing an alarm. In medical telemeter,
The transmitter has a power-off detection means for detecting that the power-off operation of the transmitter has been performed, and a delay means for delaying the power-off state after the power-off operation from the power-off detection means. And a notice signal generating means for giving a notice signal for giving notice that the emission of the radio wave of the transmitter is stopped within the time when the transmitter is operating by the delay means, and the notice signal is given to the receiver. A warning signal detecting means for detecting,
The alarm is turned off by determining that the radio wave is cut off by performing the operation of turning off the power source from the signal of the radio wave cutoff from the radio wave cutoff detection means and the warning signal detected by the warning signal detection means. It is characterized in that it is provided with a control means.

The medical telemeter according to a second aspect of the invention is characterized in that the receiver is provided with a control means for turning off the advance notice signal after a lapse of a predetermined time after detecting the advance notice signal.

[0008]

In the medical telemeter according to claim 1,
When a nurse or the like turns off the power of the transmitter with respect to the transmitter, the power-off detection means detects it, and the notice signal generation means generates a predetermined signal. During this time, power supply is continued for a predetermined time set by the delay means, then power supply to the transmitter is stopped and radio wave emission is stopped.

In the receiver, after the warning signal is detected by the warning signal detecting means, when the radio wave cutoff detecting means detects the stoppage of the radio wave after a short time, the nurse or the like turns off the power supply by a proper operation. Therefore, the control means does not issue a warning. If only the signal of radio wave loss is detected without detecting the warning signal, an alarm is issued as usual.

Further, in the medical telemeter according to the second aspect, a signal or code similar to the advance notice signal is generated due to some noise or an interfering radio wave, and as a result, in order to prevent an accident in which the alarm function is stopped, the reception is performed. If the radio wave is not cut off even after a certain time has elapsed since the machine detected the warning signal, the warning signal can be activated by the control means by turning off the warning signal.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the medical telemeter of the present invention will be described below with reference to the drawings.

1 and 2 show the configuration of an embodiment of the present invention. FIG. 1 is a functional block diagram showing a schematic configuration of a transmitter. An electrocardiogram signal of the patient is input to the transmitter 11 from the electrocardiographic electrode 12, for example. This electrocardiogram signal is the amplifier 1
Amplified by 3, enters the modulation circuit 15 via the contact a of the switch 14, is modulated into a transmission radio wave, and is transmitted from the antenna 16. Further, power is supplied to the transmitter 11 from the battery 17 via the switch 18 and the diode 19. On the load side of the diode 19, a capacitor 20 which is a delay means for stopping the emission of radio waves is provided, and the transmitter 11 is operated by the power supplied from the capacitor 20 for a certain period of time even after the switch 18 is turned off. You can do it.

An advance notice signal generating means 21 is provided in the transmitter 11, and the advance notice signal generating means 21 is detected by the detection result of the power-off detecting means 22 connected to the wiring connecting the switch 18 and the diode 19 . The operation is controlled. Further, the output side of the notice signal generating means 21 is connected to the contact b of the switch 14, and when the power-off detecting means 22 detects that the switch 18 is turned off, the switch 14 is switched to the contact b side and, at the same time, the notice signal. A warning signal is issued from the generating means 21. This notice signal is transmitted from the antenna 16 via the contact b of the switch 14 and the modulation circuit 15.

FIG. 2 is a functional block diagram showing a schematic configuration of the receiver 31. In FIG. 2, parts corresponding to those of the conventional example shown in FIG. 4 are designated by the same reference numerals, and description thereof will be omitted as appropriate. The output side of the demodulation circuit 3 is connected to the input side of the advance notice signal detecting means 32, and the output side of the advance notice signal detecting means 32 is connected to the radio wave cutoff detecting means 5 via the holding circuit 33.
Is connected to the gate 34 which is a control means inserted between the output side of the alarm 6 and the input side of the alarm 6. Further, the advance notice signal cancel timer 35 receives the respective outputs of the advance notice signal detecting means 32 and the radio wave cutoff detecting means 5 and operates to release the holding operation of the holding circuit 33.

Next, the operation of this embodiment will be described with reference to FIGS. When the nurse turns off the switch 18, the power-off detecting means 22 detects it and the switch 14 turns the contact b.
Switched to the side. At the same time, the warning signal generating means 21 generates a warning signal with a predetermined signal or code,
This advance notice signal is transmitted from the antenna 16 via the contact b of the switch 14 and the modulation circuit 15. Although the switch 18 is off at this time, the capacitor 2
The transmitter 11 is operating with the voltage stored at 0,
As shown in FIG. 3, when the time t elapses after the advance notice signal is issued, the operation of the transmitter 11 is stopped and the radio wave is no longer emitted.

In the receiver 31, the notice signal detecting means 32 detects the notice signal, and after the time t has passed, the radio wave cutoff detecting means 5 detects the stop of the radio wave. At this time, it is judged that the nurse has turned off the power supply switch 18 by a proper operation, and the alarm 6 is turned off through the gate 34. When the notice signal detecting means 32 does not detect the notice signal and the radio wave cutoff detecting means 5 detects the stop of the radio wave, it is judged that the patient with the transmitter has moved out of the reception range, and the gate 34 is used. Issue alarm 6.

On the other hand, when the radio wave has not stopped even after a certain time has elapsed since the advance notice signal detecting means 32 detected the advance notice signal, the time T set in the advance notice signal cancel timer 35 has passed. Sometimes the holding circuit 33 is released,
The receiver 31 is returned to the original state. This is to prevent an accident in which a warning signal is generated in the receiver 31 due to some noise or an interference wave and the alarm function is stopped.

According to the present embodiment, when the patient with the transmitter moves out of the range of the receiver, the alarm 6 is issued, and when the power switch 18 of the transmitter is turned off by the normal procedure. Since the alarm 6 is stopped, the false alarm can be prevented from being issued, the reliability of the device can be improved, and the monitoring of other patients who continue monitoring can be prevented from being disturbed.

In the above embodiment, the case where the notice signal cancel timer 35 is provided in order to prevent the occurrence of malfunction due to noise or the like has been described. However, the presence or absence of an ID code added to a signal component in the case of digital communication is detected. You may do it. That is, if the radio wave is cut off after detecting the warning signal, the ID code disappears. Therefore, when the ID code is detected again after detecting the warning signal, the normal operation may be resumed. On the other hand, in the transmitter as well, in order to simplify the explanation, the method of delaying the stop of the radio wave by the electric power accumulated in the capacitor is illustrated, but another method such as delaying with a timer etc. for more accurate operation is exemplified. A method of implementation is also possible.

[0020]

As described above, according to the medical telemeter of the present invention, since the alarm is stopped when the power of the transmitter is turned off by the normal operation, a false alarm is not issued. The reliability of the device is improved, and it is possible to prevent interference with the monitoring of other patients who continue to monitor. Further, since the notice signal is turned off after a predetermined time has elapsed after the notice signal was detected, it is possible to prevent the occurrence of malfunction due to noise or the like and further improve the reliability of the device.

[Brief description of drawings]

FIG. 1 is a functional block diagram showing a configuration of a transmitter according to an embodiment of a medical telemeter of the present invention.

FIG. 2 is a functional block diagram showing the configuration of a receiver according to an embodiment of the medical telemeter of the present invention.

FIG. 3 is a time chart explaining the operation of the present embodiment.

FIG. 4 is a functional block diagram showing a configuration of a receiver according to an example of a conventional medical telemeter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Receiving antenna 4 ... Processing circuit 5 ... Radio wave cutoff detection means 6 ... Alarm 11 ... Transmitter 20 ... Capacitor (delay means) 21 ... Warning signal generation means 22 ... Power supply cutoff detection means 31 ... Receiver 32 ... Warning signal detection means 34 ... Gate (control means) 35 ... Warning signal cancellation timer (control means)

Claims (2)

[Claims] 1. A transmitter for wirelessly transmitting a detected biomedical signal, a receiver for receiving the biomedical signal transmitted from the transmitter, and processing and displaying the biomedical signal received by the receiver. In the medical telemeter having a processing circuit for detecting the radio wave of the radio signal emitted by the transmitter and issuing an alarm by detecting the radio wave of the radio signal, the transmitter is operated to turn off the power of the transmitter. Power-off detection means for detecting that the power-off state has been detected, delay means for delaying the power-off state after the power-off operation from the power-off detection means, and transmission within the time the transmitter is operating by the delay means. A notice signal generating means for giving a notice signal for giving notice of stopping the emission of the radio wave of the machine is provided, and a notice signal detecting means for detecting the notice signal in the receiver,
Control for turning off the alarm by determining that the radio wave is cut off by the operation of the power-off detection means from the signal of the radio wave cutoff from the radio wave cutoff detection means and the warning signal detected by the warning signal detection means Means for providing a medical telemeter. 2. The medical telemeter according to claim 1, wherein the receiver is provided with control means for turning off the advance notice signal after a predetermined time has elapsed since the advance notice signal was detected.