JPH05192300A - Portable type medical treating device - Google Patents

Abstract

PURPOSE:To provide the safe portable type medical treating device which prevents the liquid leakage, expansion and rupture of a battery by detecting the consumption of the battery and electrically breaking the connection between the battery and a main circuit. CONSTITUTION:The electric power from the battery 99 is inputted to an input section (in) of a perfect discharge preventive circuit 95 and is outputted to an output section (out) through a power source switch 951 which can be electrically controlled to on/off. The input section (in) is inputted to a battery voltage drop detecting means 952 as well. The battery voltage drop detecting means 952 monitors the voltage of the input section (in), i.e., the voltage of the battery 99, detects the capacity drop of the battery 99 from the voltage drop and outputs the detection signal to the power source switch 951. The means controls the supply and break of the electric power by controlling the power source switch 951 to on when the battery voltage drop is not detected and by controlling the switch to off when the battery voltage drop is detected.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to portable medical devices. More specifically, it relates to a portable medical device using a battery as a power source.

[0002]

2. Description of the Related Art In a conventional portable medical device, for example, a long-time electrocardiograph, a magnetic tape is used as a recording medium for electrocardiographic data. In this method, electrocardiographic data for 24 hours is magnetically recorded on a magnetic tape, the magnetic tape is reproduced and analyzed by a dedicated analyzer, and the result is printed. According to this method, the electrocardiographic data is magnetically recorded on the magnetic tape, so that the data can be stored for a long time even if the power supply from the power supply of the electrocardiograph is lost.

However, the method of recording on the magnetic tape has a drawback that it takes time to reproduce and analyze the magnetic tape when outputting the analysis result.

Therefore, recently, a long-time electrocardiograph, which has a microcomputer and a semiconductor memory built-in, records digital electrocardiogram data for 24 hours in the semiconductor memory and further executes real-time analysis by the microcomputer. Being developed. According to this method, since the analysis of the data has already been completed at the time of printing the data, the printout of the analysis result can be obtained in a short time.

According to this method, a power source is required to store data such as electrocardiogram data recorded in the semiconductor memory after the measurement for 24 hours is completed. Then, in the long-time electrocardiograph according to the conventional method, the surplus electric power of the battery used for the measurement for 24 hours is used for the data storage of the semiconductor memory and is continued as long as the electric power is available.

[0006]

However, if the power supply is continued for data storage or the like until the battery is completely discharged as described above, the battery may be completely discharged, causing liquid leakage and expansion of the battery. There is. Furthermore, when multiple batteries are connected in series and used, there is a risk of explosion, not only causing equipment failure and damage, but also for the user carrying the equipment. ..

The present invention has been made in view of the above-mentioned conventional example, and by detecting the exhaustion of the battery and electrically disconnecting the connection between the battery and the main circuit, liquid leakage, expansion,
It is an object of the present invention to prevent a rupture and provide a safe portable medical device.

[0008]

To achieve the above object, a portable medical device according to the present invention detects a decrease in voltage supplied from the battery in a portable medical device using a battery as a power source. The detection means and the control means for cutting off the power supply from the battery by the detection of the voltage drop by the detection means.

[0009]

In the above structure, the voltage drop of the power source portion caused by the exhaustion of the battery is detected, the power supply from the battery is cut off, and the battery is prevented from being completely discharged.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a long-term electrocardiograph 100 according to this embodiment.
FIG. 2 is an external view of the long-time electrocardiograph 100 according to the present embodiment from the back side, and FIG. 3 is a functional block diagram of the long-time electrocardiograph according to the present embodiment.

A disposable electrode is used for the electrode section 10, and this electrode is attached to the chest and abdomen of the subject. Then, a predetermined derivation method (CM ₅ , CC ₅ , NAS
(A, etc.) to input the electrocardiogram signal. The electrocardiogram potential input from the electrode unit 10 is amplified by the amplifier unit 20 and then converted into a digital value by the A / D conversion unit 30. The CPU 40 records the digital data in the recording unit 70 and analyzes the data.

The operation unit 50 is an operation panel provided with a measurement start switch and the like, the display unit 60 displays the state of the electrocardiograph 100, and the communication unit 80 transfers the data recorded in the recording unit 70 to an external device. It is output. The operation unit 50,
The display unit 60 is provided on the outer surface of the electrocardiograph for a long time. The operation unit 50, the display unit 60, and the communication unit 80 are all CPs.
It is connected to U40.

As shown in FIG. 2, this long-term electrocardiograph 100 is provided.
Has a battery compartment 98 on the back side of the battery
Put on. Electric power from the mounted battery 99 is supplied to the power supply unit 90 through the complete discharge prevention circuit 95. Then, from the power source section 90 to the amplifier section 20 and the A / D conversion section 3
Electric power is distributed and supplied to each unit such as 0.

FIG. 4 is a detailed block diagram of the complete discharge prevention circuit 95 of this embodiment. The power from the battery 99 is input to the input section (in) of the complete discharge prevention circuit 95, and is output to the output section (out) via the power switch 951 which can be electrically turned on / off. The input unit (in) is also input to the battery voltage drop detecting means 952. The battery voltage drop detecting means 952 monitors the voltage of the input section (in), that is, the voltage of the battery 99, detects the capacity drop of the battery 99 from the voltage drop, and outputs the detection signal to the power switch 951. When the battery voltage drop is not detected, the power switch 951 is turned on, and when the battery voltage drop is detected, it is turned off.

FIG. 5 is a circuit diagram showing an example of a concrete circuit of the complete discharge prevention circuit. Battery voltage drop detecting means 952
Is an NPN transistor TR2 (440) and an IC3 (42
0) and. The input c of IC3 (420) is I
It is an IC that outputs an output x = L when the voltage is equal to or higher than a voltage value specific to C3 (battery voltage drop detection level), and outputs x = H when the voltage is less than the specific voltage value. The output x of this IC3 is connected to the base of TR2 (440), and T
The switching of R2 (440) is controlled (ON / OFF control between the emitter and collector). Therefore, when the voltage of the connected battery is equal to or higher than the voltage drop detection level, since the output x is L, the emitter-collector of TR2 (440) is turned off, and when the battery voltage becomes lower than the voltage drop detection level, the emitter is ~ It is turned on between collectors.

A battery 99 is connected between the input terminals in + and in-, and each IC in the complete discharge prevention circuit is the battery 99.
Powered by more. In addition, the RS flip-flop 41
Reference numeral 0 is a circuit composed of IC1 (400) and IC2 (401). The RS flip-flop 410 has a set input a, a reset input b, and an output y, and the logical value table of these inputs and outputs is shown in FIG. The switch 490 is a power switch operated when the power is turned on. The inputs a and b of the RS flip-flop 410 are respectively resistors R1 (46 and
0) and R2 (470) are connected to in +. When the battery 99 is connected to in + and in-, TR2
Since (440) is in the off state, it stabilizes in the state of a = H and b = H, but in the transient state, the input circuit is composed of the capacitor C1 (450) and the resistor R2 (470). As a result, the input b goes into the H state later than the input a. Therefore, the state of a = H and b = L exists in the process until it stabilizes at a = H and b = H. Therefore, RS
The flip-flop 410 is initialized to the output y = H according to the logical value table of FIG. When the switch 490 is turned on, the inputs a and b become a = L, b = H, and R
The output y of the S flip-flop 410 is in the state of y = L. Here, even if the switch 490 is turned off again, the output y
= L is maintained.

The PNP transistor TR1 (430) is i
It is connected between n + and out +, and TR1 (43
The base of 0) is connected to the output y of the RS flip-flop 410 via the resistor R3 (480). When the output y = H, the emitter and collector of TR1 are turned off, and when the output y = L, the emitter-collector of TR1 is turned on.

Next, as the battery becomes exhausted, IC3 (420)
When the voltage of the input c of the voltage becomes lower than the voltage drop detection level, the output x of the IC3 becomes H as described above, so that TR2
The (420) emitter and collector are turned on.
The collector of TR2 (440) is the RS flip-flop 4
Since it is connected to the input b of 10, TR2 (420)
When is turned on, the input b becomes L and the output y of the RS flip-flop 410 becomes H. When the output y becomes H, the emitter-collector of TR1 (430) is turned off and the power supply from the battery 99 is cut off.

From the above, the complete discharge prevention circuit 95 is
When the battery 99 is connected, it is initialized in the off state first, and when the switch 490 is turned on next, the state is changed to the on state and the power supply from the battery 99 is started. When the battery is exhausted and the voltage from the battery falls below the voltage drop detection level of the IC3 (420), the TR1 (430) is turned off and the power supply is cut off.

Further, when N batteries are connected in series, the voltage detection level is set to (N-1) / N of the rated voltage, so that even when one of a plurality of batteries connected in series is completely discharged. It can be detected as a voltage drop. As a result, even if only one battery is in a completely discharged state due to variation in battery consumption, this is detected and the power is shut off, so that liquid leakage, expansion, and rupture of the battery can be prevented more reliably.

As described above, in the long-time electrocardiograph according to the present embodiment, when the drop in the battery voltage is detected, the power is automatically cut off, so that the complete discharge of the battery is prevented.
It is safe because it prevents battery leakage, swelling and rupture.

If the initial voltage of the battery is less than the voltage detected by the voltage drop detecting means 529 when the battery is connected, the switch 490 is not turned on and the user's reuse of the battery is prevented. There is also.

[0024]

As described above, according to the portable medical device of the present invention, the consumption of the battery is detected, the connection between the battery and the main circuit is electrically cut off, and the battery leaks, expands, Since rupture and the like are prevented, a safe portable medical device can be provided.

[Brief description of drawings]

FIG. 1 is an external view of a long-term electrocardiograph according to this embodiment.

FIG. 2 is an external view showing a battery mounting portion of the long-term electrocardiograph according to the present embodiment.

FIG. 3 is a functional block diagram of a long-term electrocardiograph according to the present embodiment.

FIG. 4 is a block diagram of a complete discharge prevention circuit.

FIG. 5 is a circuit diagram showing a specific circuit example of a complete discharge prevention circuit.

6 is a diagram showing an input / output relationship of an RS flip-flop in the circuit example of FIG.

[Explanation of symbols]

 90 power supply unit 95 complete discharge prevention circuit 99 battery 951 power switch 952 battery voltage drop detection unit

Claims (1)

[Claims] 1. A portable medical device that uses a battery as a power source, wherein a detecting unit that detects a decrease in voltage supplied from the battery, and a power supply from the battery by detecting the voltage decrease by the detecting unit. A portable medical device, comprising: a control unit that shuts off the device.