JPS621735B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a low-frequency treatment device that performs treatment by applying low-frequency treatment signals to an affected area. A pair of conductors that act as electrodes are brought into contact with the affected areas of the patient's shoulders, lower back, etc., and low-frequency pulses of an appropriate frequency are supplied to the conductors to stimulate the human body and perform tasks such as shoulder tapping, shoulder massage, etc. There are low frequency therapy devices that generate a tactile sensation. This type of low-frequency therapy device usually generates a first pulse with a frequency of about 50 [Hz] as shown in Fig. 1A, and a second pulse (Fig. 1B) with a frequency of about 1 [Hz], respectively. The first
As shown in Figure C, there are two types of output formats: one is to form an intermittent treatment signal by combining the first pulse and the second pulse, and the other is to use the first pulse as it is as a treatment signal. ing. An object of the present invention is to periodically switch the output polarity of the above-mentioned continuous or intermittent therapeutic signals using a simple configuration to obtain different therapeutic sensations. 2 and 3 are a circuit diagram showing an embodiment of the present invention and a waveform diagram explaining the operation, in which 1 is a DC power source such as a dry battery, and 2 is a reference signal CP by applying the DC power source 1. Two inverters to output
A reference signal source consisting of a well-known astable multivibrator consisting of I ₁ , I ₂ and a CR circuit 3; 4 is a timer section that regulates the output period of the treatment signal based on the reference signal CP of the reference signal source 2; , the timer unit 4 sequentially receives the reference signal CP (1/2) ¹ , (1/2) ² ,...
(1/2) A PNP type that operates ON and OFF using a frequency divider 5 that divides the frequency by ¹² and a (1/2) ¹² frequency division output (hereinafter referred to as _Q12 frequency division output) of the frequency divider 5. The switching transistor _ST1 is turned on when the _Q12 frequency divided output of _the frequency divider 5 inputted to the base is "Lo", and the DC power supply 1 is connected to the emitter. The power supply voltage V _DD is applied to other components to be described later through the collector, and when it is "Hi", it is turned off to cut off the power supply voltage. 6 is a low frequency pulse generator of about 1 to 50 Hz consisting of an IC logic element and an externally attached passive element, and a power supply voltage Vdd is applied to the IC logic element from the timer section 4. There is. Reference numeral 7 denotes a selection section that regulates the output status of the pulse generator 6 by selecting a signal to be input, and one input terminal is connected to the Q1 _frequency division output terminal of the frequency divider 5.
It is equipped with a NAND gate N and a selection switch SS that selectively grounds the other input terminal of the NAND gate N coupled to the switching transistor _ST1 , and when the selection switch SS is turned on, the
The other input terminal of NAND gate N is in “Lo” state, and the output is “Hi” regardless of the state of one input terminal.
state. That is, when the selection switch SS is ON, the pulse generator 6 generates a frequency of 1 to 50 Hz as shown in FIG. 3A.
This pulse is continuously output for the period that the timer section 4 is ON. On the other hand, the above selection switch SS
When the OFF state is selected, the other input terminal of the NAND gate N continues to be in the "Hi" state, and therefore outputs an inverted signal of the _Q1 frequency-divided output applied to one input terminal. The pulse generator 6, which receives the inverted signal of the _Q1 frequency-divided output, intermittently generates low-frequency pulses (FIG. 3B) only during the period when the inverted signal is "Hi". Tr ₁ is the pulse output (first
A or C) in the figure is input to the base and the collector side is connected to the DC power supply 1 via the main switch MS, a first amplification transistor 8a,
8b is a first amplifying transistor _Tr1 , which is provided in parallel to further amplify the amplified output of the first amplifying transistor Tr1, respectively.
In the second amplifier, each of the two amplifiers 8a, 8b is
PNP type switching transistor ST ₂₁ , ST ₂₂
and second amplification transistors Tr ₂₁ and Tr ₂₂ , and the switching transistors ST ₂₁ and ST ₂₂
When is ON, each second amplification transistor Tr ₂₁ ,
The amplified output of the first amplification transistor Tr ₁ is fed to Tr ₂₂ . T is the first and second amplifier 8
A transformer in which the collectors of the second amplification transistors Tr ₂₁ and Tr ₂₂ of a and 8b are respectively coupled to the start and end ends of the primary winding, and the intermediate tap of the primary winding of the transformer T is connected to the DC power supply 1. ing. VR is a variable resistor that is connected to the secondary winding of the transformer T and adjusts the output level of the treatment signal; 9, 9 is a pair of conductors that apply the treatment signal whose output is adjusted by the variable resistor VR to the human body; The conductors 9, 9 have contact surfaces made of conductive rubber, sponge, etc., and are attached to the human body via a stretchable belt. 10 is a polarity switching unit that periodically changes the output polarity of the treatment signal applied to the human body via the conductors 9, _{9 ;} , when in the ON state, the above _Q2 frequency divided output is sent to the switching transistor of the first amplifier 8a.
It is composed of a polarity changeover switch CS which outputs the output to the base of _ST21 and applies the divided-by- ₂ output, which is the output of the inverter _I3 , to the base of the switching transistor _ST22 of the second amplifier 8b. That is, the polarity switching switch CS of the polarity switching unit 10 is turned on.
In this state, the switching transistors ST ₂₁ and ST ₂₂ of the first and second amplifiers 8a and 8b alternately turn ON and OFF in response to the _Q2 frequency divided output. When the main switch MS is turned on with the conductors 9, 9 attached to the human body, the frequency divider 5 is initially reset by applying a reset signal to the reset terminal RE while the capacitor C is being charged. Ru. Immediately after the initial reset, the _Q12 frequency divided output of the frequency divider 5 is in the "Lo" state, and the switching transistor _ST1 is turned on to convert the power supply voltage V _DD of the DC power supply 1 to the reference signal source 2 and the pulse generator 6. etc. The reference signal source 2 supplied with the power supply voltage V _DD generates a reference signal CP with a frequency of 2.275 Hz, for example, and outputs the reference signal CP to the frequency divider 5.
Output to. Frequency divider 5 divides the reference signal CP into (1/
2) ¹ , (1/2) ² ,..., (1/2) Divide the frequency by ¹² , and the _Q12 frequency divided output changes from "Lo" to "Hi" after counting ²¹¹ (=2048) reference signals CP. It is reversed and switching transistor _ST1 is turned off. That is, the timer section 4 comprising the frequency divider 5 and the switching transistor _ST1 operates as a timer of 1/2.275Hz×2048≈900sec=15mit. Now, the patient turns on the selection switch SS of the selection unit 7 in order to obtain continuous treatment signals as shown in FIG. 3A.
Next, turn the polarity changeover switch CS of the polarity changeover unit 10.
Set to OFF state. In this state, the pulse generator 6 continuously outputs low-frequency pulses of a predetermined frequency because the input signal, the output of the NAND gate N of the selection section 7, continues to be in the "Hi" state. This continuous pulse is applied to the first and second amplifiers 8a and 8 connected in parallel via the first amplification transistor _Tr1 .
b. However, among the first and second amplifiers 8a and 8b to which the continuous pulses are supplied, the switching transistor of the first amplifier 8a
The base of ST ₂₁ is connected to the timer section 4 because the polarity changeover switch CS of the polarity changeover section 10 is turned off, and therefore the switching transistor _ST21 is turned off and the first amplifier 8a is connected to the timer section 4.
The amplification operation of is in a stopped state. On the other hand, the base of the switching transistor ST ₂₂ of the second amplifier 8b is grounded via the polarity switch CS, so it is in the ON state, and the continuous pulse is applied to the base of the second amplification transistor Tr ₂₂ . . Therefore, a current ib synchronized with the continuous pulse is applied to the collector of the second amplifying transistor _Tr22 from the intermediate tap of the transformer T toward the end of the primary winding.
flows, inducing a continuous pulse of therapeutic signal in the secondary winding. Then, a continuous treatment signal as shown in FIG. 3A whose output is adjusted to a desired value by the variable resistor VR is applied to the human body from the pair of conductors 9, 9. Next, when the changeover switch CS of the polarity changeover section 10 is turned ON, each switching transistor of the first and second amplifiers 8a and 8b is switched from the polarity changeover section 10 to the ON operation.
The outputs applied to the bases of ST ₂₁ and ST ₂₂ are synchronized with the _Q2 divided output, and each switching transistor
ST ₂₁ and ST ₂₂ alternately perform a switching operation in which one becomes "Hi" and turns off, and the other becomes "Lo" and turns on. As a result, the first and second amplifiers 8a,
The second amplifying transistors Tr ₂₁ and Tr ₂₂ of 8b perform an amplifying operation while the switching transistors ST ₂₁ and ST ₂₂ are ON, and currents ia and ib flow from the transformer T toward their respective collectors. Since the currents ia and ib that alternately flow from the transformer T toward the collector start from the intermediate tap of the primary winding and flow to the starting and ending ends, respectively, the polarities of the treatment signals induced in the secondary winding are opposite to each other. become.
That is, if the polarity of the treatment signal induced by ib flowing to the second amplifier 8b is positive, that of ia is negative, and the output polarity of the treatment signal applied to the human body from the conductors 9 constitutes the timer section 4. of frequency divider 5
The _Q2 frequency division output causes the signal to be changed periodically as shown in FIG. 3C. Then, when the selection switch SS of the selection unit 7 is turned OFF while the output polarity of the treatment signal is periodically changed by the operation of the polarity switching unit 10, that is, the polarity selection switch CS is ON, the oscillation of the pulse generator 6 is stopped. This occurs only when _{the 1} frequency division output, which is the output of the NAND gate N, is “Hi”. Therefore, the output width at each polarity of the treatment signal whose output polarity is periodically reversed in synchronization with the _Q2 frequency division output is as shown in Figure 3D, during the period when _{the 1} frequency division output is "Hi". Reduce by half. That is, the polarity is periodically switched by the selection operation of the selection switch SS, and the output width of the continuous treatment pulse is reduced. Also, if the polarity selector switch CS is turned OFF while the selection switch SS is OFF, the first
Since the amplifier 8a is inactive, periodic polarity switching is no longer performed and the pulse generator 6
Intermittent pulses (FIG. 3B) output in response to the _1- frequency divided output are applied to the human body from the conductors 9, 9. The relationship between the states of the selection switch SS and polarity switch CS and the treatment signal will be described below.

[Table] In the above explanation, the output polarity of the treatment signal was changed periodically by the Q ₂ frequency divided output of the frequency divider 5, but other frequency divided outputs such as Q ₁ , Q ₃ , _Q4
It may be a frequency-divided output, or even the reference signal CP of the reference signal source 2. As is clear from the above description, the present invention includes a timer unit that regulates the output period of a low-frequency treatment signal based on a reference signal, and a frequency divider that forms a plurality of frequency-divided outputs. Since the output polarity of the treatment signal is periodically changed by the frequency-divided output of a part of the frequency divider or the above-mentioned reference signal, the frequency-divided output of the frequency divider or the reference signal, which was conventionally necessary to configure the timer section, can be changed. By effectively utilizing this, it is possible to obtain a plurality of treatment signals with different therapeutic sensitivities with a simple configuration.

[Brief explanation of the drawing]

FIG. 1 shows a waveform diagram of a conventional low frequency treatment device, FIG. 2 shows a block diagram of the low frequency treatment device of the present invention, and FIG. 3 shows a waveform diagram for explaining the operation of the present invention. 1... DC power supply, 2... Reference signal source, 4... Timer section, 6... Pulse generator, 8a, 8b... Amplifier, T
...Transformer, 5...Frequency divider, 10...Polarity switching unit, 7
...Selection section.

Claims (1)

[Claims] 1. A DC power supply, a reference signal source that outputs a reference signal by applying the DC power, and a timer unit that regulates the output period of a low-frequency treatment signal based on the reference signal of the reference signal source. a pulse generator that generates a low frequency output within an output period regulated by the timer section; an amplifier that amplifies the output of the pulse generator and supplies it to the primary winding of the transformer; The timer section is composed of a frequency divider that forms a plurality of frequency-divided outputs, and the timer section is composed of a frequency divider that forms a plurality of frequency-divided outputs. A low frequency treatment device characterized by having a polarity switching section that periodically changes the output polarity of a treatment signal. 2. Claim 1, characterized in that a selection unit is provided for selectively regulating the output width of each polarity of the treatment signal whose polarity changes periodically by using another divided output of the frequency divider. The low frequency treatment device according to item 1.