JP6283589B2 - Special handset - Google Patents

Description

  The present invention relates to a nurse call slave for an inpatient of a hospital to call a nurse, and more particularly to a special call slave that can be called by an operation other than pressing a button such as a touch operation or detection of expiration.

  Conventionally, there is a special caller as a nurse call child that can be called by a special operation such as touch operation or detection of expiration. For example, the special call extension device described in Patent Document 1 includes an expiration sensor that detects expiration at the tip of the flexible arm, a touch electrode that detects a touch operation such as contact of a fingertip or a tongue, and detection that a hand has been touched. An optical sensor that detects sound and sound is attached, and a sensor that is preferable for a patient is selected and used as a nurse call slave.

JP 2010-104594 A

  In such a special paging device, the touch electrode for calling by a touch operation needs to be kept clean and is removed and disinfected. For this reason, the removed touch electrode may be forgotten, and the patient will not be able to perform a call operation and the touch electrode itself may be lost, so the nurse always manages the state of the touch electrode. There was a need.

  Therefore, in view of such a problem, an object of the present invention is to provide a special caller that can prevent forgetting to attach a detached touch electrode.

In order to solve the above-mentioned problem, the invention of claim 1 is a touch electrode whose capacitance changes upon receiving a touch operation, and a call determination for determining that the touch operation has been received when the capacitance of the touch electrode changes by a predetermined amount. In a special paging device that outputs a paging signal when a touch operation is received, a connection portion to which the touch electrode is connected is connected to a specific static via a contact that is turned on when the touch electrode is removed. A capacitor for generating a capacitance at the connection portion is connected, and the call determination means touches when the capacitance through the connection portion changes to a specific capacitance in addition to the determination of the touch operation of the touch electrode. It is determined that the electrode has been removed.
According to this configuration, when the touch electrode is removed, it can be determined from the change in capacitance, so that the state where the touch electrode is removed can be notified. Therefore, it helps to prevent the removed touch electrode from being left unattended. In addition, it is possible to recognize the removal of the touch electrode by using a circuit for detecting a call operation that has been incorporated in the past, as long as a capacitor is connected to the connection portion of the touch electrode via a contact point, which greatly increases the cost. Removal detection can be performed without inviting.

According to a second aspect of the present invention, in the configuration according to the first aspect, the call determination means outputs an alarm signal to the outside when the state of changing to a specific capacitance continues for a certain period of time.
According to this configuration, an alarm signal is output when the touch electrode is forgotten to be installed, so that if the alarm sound is sounded by a nurse call parent device or the like by this signal, a situation in which the patient cannot perform a call operation occurs. Can be prevented. Furthermore, it is not necessary for the nurse to constantly check the state of the special caller, so that the burden can be reduced.

  According to the present invention, when the touch electrode is removed, it can be determined from the change in capacitance, so that the state where the touch electrode is removed can be notified. Therefore, it helps to prevent the removed touch electrode from being left unattended. In addition, it is possible to recognize the removal of the touch electrode by a call detection circuit that has been incorporated in the past so that a capacitor is connected to the connection portion of the touch electrode via a contact point, resulting in a large cost increase. It can be implemented without any problems.

It is a circuit diagram which shows an example of the special calling machine which concerns on this invention, and has shown the touch operation detection circuit. FIG. 2 is a waveform explanatory diagram of a main part of FIG. 1, (a) shows an input waveform of an extraction circuit, (b) shows an input waveform of a first waveform shaping circuit, and (c) shows an input waveform of a second waveform shaping circuit. ing. 2 is a waveform explanatory diagram of a main part of FIG. 1, in which (a) is an output waveform of a first waveform shaping circuit, (b) is an output waveform of a second waveform shaping circuit, and (c) is an output waveform and smoothing of a phase extraction circuit. The output waveforms of the circuit are shown. It is a characteristic view which shows the relationship between the electrostatic capacitance of a touch electrode, and the input voltage of an A / D converter. It is explanatory drawing which removed the touch electrode, (a) is a circuit diagram of a connection jack, (b) is an input waveform diagram of a 1st waveform shaping circuit.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below in detail with reference to the drawings. FIG. 1 is a circuit diagram showing an example of a special caller according to the present invention, and shows a touch operation detection circuit that extracts a change in capacitance of a touch electrode and determines a call operation from the amount of change in capacitance. ing. In FIG. 1, 1 is a touch electrode, 2 is a connection jack which is a connection portion of the touch electrode 1, 3 is an extraction circuit for extracting the amount of change in capacitance, and 4 is a DC output of the extracted waveform (rectangular wave) for output. The smoothing circuit 5 performs an A / D converter, 6 determines whether the capacitance change of the touch electrode 1 is caused by a touch operation, and generates and outputs a call signal when the touch operation is performed. This is a touch electrode CPU that detects the occurrence of forgetting attachment and outputs an alarm signal.

The connection jack 2 incorporates a contact 2a that is turned off when the touch electrode 1 is connected and turned on when the touch electrode 1 is removed. The contact jack 1 is connected to the connection line S1 that connects the terminal of the touch electrode 1 to the extraction circuit 3. The capacitor C1 is configured to be connected / disconnected. Specifically, when the touch electrode 1 is removed, the first capacitor C1 is connected to the connection line S1.
The first capacitor C1 has a capacitance sufficiently larger than the capacitance specific to the touch electrode 1 and the capacitance of the touch electrode 1 when a touch operation is performed.

  The extraction circuit 3 includes two integration circuits (first integration circuit 3a, second integration circuit 3b), two waveform shaping circuits (first waveform shaping circuit G1, second waveform shaping circuit G2) including a comparator, logic A rectangular wave composed of a phase extraction circuit G3 composed of a circuit and shaped and output by the waveform shaping circuits G1 and G2 is subjected to exclusive OR operation in the phase extraction circuit G3 and output. Further, for example, as shown in FIG. 1, the smoothing circuit 4 is constituted by an integrating circuit including a third resistor R3 and a third capacitor C3.

  2 and 3 show the waveform of each point of the extraction circuit 3 and the output waveform of the smoothing circuit 4. Specifically, FIG. 2A shows the voltage waveform at the point P1 output from the touch electrode CPU6 in the direction indicated by the arrow Q1 and is input to the extraction circuit 3, and FIG. 2B shows the first waveform shaping circuit G1. FIG. 2 (c) shows the waveform at point P3 input to the second waveform shaping circuit G2. Note that a waveform A1 in FIG. 2B is a steady-state waveform that is not subjected to the call operation, and a waveform A2 is a waveform when the call operation is received. 3A shows the waveform at the output P4 point of the first waveform shaping circuit G1, FIG. 3B shows the waveform at the output P5 point of the second waveform shaping circuit G2, and A3 in FIG. 3C shows phase extraction. The waveform at the output P6 of the circuit C3 is shown. A4 represents a direct current waveform that has been shaped by the smoothing circuit 4.

A rectangular wave shown in FIG. 2A is generated from the touch electrode CPU6 and output to the extraction circuit 3, and the first waveform shaping circuit G1 has the touch electrode 1 via the first resistor R1 and the connection line S1. This waveform is deformed and inputted by the first integrating circuit 3a composed of the electrostatic capacity of.
On the other hand, a rectangular wave similarly generated by the touch electrode CPU6 is transformed and input to the second waveform shaping circuit G2 by the second integrating circuit 3b including the second resistor R2 and the second capacitor C2.

  The second capacitor C2 is set to a value equal to the inherent capacitance of the touch electrode 1, and the first resistor R1 and the second resistor R2 have the same resistance value. Therefore, at the time of standby without receiving a touch operation, the same waveform is input to the first waveform shaping circuit G1 and the second waveform shaping circuit G2. Thus, the second integration circuit 3b generates a reference waveform for detecting a touch operation of the touch electrode 1.

  The rectangular waves output from the two waveform shaping circuits G1 and G2 are extracted with a difference extracted by the phase extraction circuit G3 and then shaped into a direct current by the smoothing circuit 4.

An operation in which the touch operation detection circuit configured as described above determines a touch operation in response to a change in the capacitance of the connection jack 2 will be described below.
In the standby state in which the touch electrode 1 is not subjected to a touch operation, the capacitances of the touch electrode 1 and the second capacitor C2 are equal, and therefore the input terminals of both the first waveform shaping circuit G1 and the second waveform shaping circuit G2 The waveform of A1 in FIG. 2B and the waveform of FIG. 2C are input and the same waveform is input. Therefore, the extraction circuit 3 does not output a signal because there is no difference between the two waveforms.

In this state, when the patient touches the touch electrode 1 or touches the tongue, the capacitance of the touch electrode 1 changes and increases. As a result, the input waveform of the first waveform shaping circuit G1 is a waveform having a large amount of deformation shown in the waveform A2 of FIG. 2B, and the output waveforms of the first waveform shaping circuit G1 and the second waveform shaping circuit G2 are as shown in FIG. As shown in FIG. 3 (a) and FIG. 3 (b), a phase difference is generated. Therefore, the phase extraction circuit G3 outputs a rectangular wave indicated by A3 in FIG.
This rectangular wave passes through the smoothing circuit 4 and is input to the A / D converter 5 as a DC voltage waveform indicated by A4 in FIG. Thus, a DC voltage proportional to the phase difference between the first waveform shaping circuit G1 and the second waveform shaping circuit G2 is input to the A / D converter 5, and a digital signal corresponding to the DC voltage value is output.

FIG. 4 shows the relationship between the capacitance of the touch electrode 1 (more precisely, the capacitance of the connection jack 2) and the input voltage of the A / D converter 5. A DC voltage proportional to the phase difference between the first waveform shaping circuit G1 and the second waveform shaping circuit G2 is input to the A / D converter 5. That is, a voltage proportional to the amount of change in the capacitance of the touch electrode 1 when the standby time is used as a reference is input. Therefore, the electrostatic capacitance of the touch electrode 1 and the input voltage of the A / D converter 5 have a proportional relationship as shown in FIG. In FIG. 4, ranges T _{1 to} T ₂ indicate capacitance ranges in which it is determined that the touch electrode CPU 6 has been touched, and T ₃ indicates values in which it is determined that the touch electrode 1 described later has been removed.

  The call signal Q2 output from the touch electrode CPU 6 is transmitted to a nurse call parent device (not shown), and the occurrence of a call is reported at the nurse call parent device.

Next, the operation when the touch electrode 1 is removed will be specifically described. FIG. 5 is an explanatory diagram of this state. FIG. 5A is a circuit diagram showing the state of the connection jack 2 when the touch electrode 1 is removed, and FIG. 5B is a waveform diagram of the point P2 shown in FIG. is there.
When the touch electrode 1 is removed, the first capacitor C1 is connected to the connection line S1 through the contact 2a. Since the first capacitor C1 has a capacitance sufficiently larger than the capacitance of the touch electrode 1 itself, the voltage waveform at the point P2 has a greatly deformed shape as shown by a waveform A5 in FIG.

As a result, the voltage waveform where the first waveform shaping circuit G1 outputs a big wave delay amount, a sufficiently large voltage compared to the voltage at the touch operation to the A / D converter 5 as shown in the T ₃ in FIG. 4 Entered. Accordingly, the touch electrode CPU 6 that has received this voltage signal determines that the touch electrode 1 has been removed, starts counting by the built-in timer circuit 6a, and counts a predetermined time such as 5 minutes.
Thereafter, if this voltage signal is continuously input even after a predetermined time has elapsed, it is determined that forgetting to attach the touch electrode 1 has occurred, and an alarm signal is generated and output.

This alarm signal is transmitted to the nurse call parent device via the same route as the call signal Q2, and the nurse call parent device notifies that the touch electrode of the special caller device has been forgotten to be attached.
Further, when the touch electrode CPU 6 determines that the touch electrode is forgotten to be attached, the buzzer included in the special caller device is sounded or the LED is blinked, and the special caller device itself also notifies the occurrence of an abnormality.

In this way, when the touch electrode 1 is removed, it can be determined from the change in capacitance, so that it is possible to notify the state of the touch electrode 1 being removed, and the removed touch electrode 1 is left unattended. This helps prevent accidents. Further, the removal of the touch electrode 1 can be recognized by the conventionally incorporated circuit for detecting the call operation by connecting the first capacitor C1 to the connection jack 2 of the touch electrode 1 via the contact 2a. The removal detection can be carried out without incurring a large cost increase.
If the touch electrode 1 is not attached after a certain period of time has elapsed, it is determined that the touch electrode 1 has been forgotten to be attached, and an alarm signal is output. If the ringing is performed, it is possible to prevent a situation in which the patient cannot perform the calling operation. Furthermore, it is not necessary for the nurse to constantly check the state of the special caller, so that the burden can be reduced.

  In the above embodiment, when a predetermined time elapses after the touch electrode 1 is removed, the special handset notifies the outside of the occurrence of an abnormality, but when it is removed, a signal for notifying it is output. For example, when the nurse call master device continuously receives the removal notification signal for a predetermined time, it may be determined that the attachment has been forgotten and an alarm sound may be generated.

  1 ··· Touch electrode 2 ··· Connection jack (connection part) 3 ··· Extraction circuit 4 ·· Smoothing circuit 5 · · A / D converter 6 · · Touch electrode CPU (calling determination means), C1 ..First capacitor (capacitor).

Claims (2)

A touch electrode having a capacitance that changes in response to the touch operation; and a call determination unit that determines that the touch operation has been received when the capacitance of the touch electrode has changed by a predetermined amount. In the special caller that outputs,
A capacitor for generating a specific capacitance in the connection portion is connected to the connection portion to which the touch electrode is connected, through a contact that is turned on when the touch electrode is removed.
In addition to determining the touch operation of the touch electrode, the call determination unit determines that the touch electrode has been removed when the capacitance through the connection portion changes to the specific capacitance. Special call handset. 2. The special caller according to claim 1, wherein the call determination unit outputs an alarm signal to the outside when the state of change to the specific capacitance continues for a predetermined time.

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