JPS6395069A - Low frequency electric stimulation signal generator - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a low frequency electrical stimulation signal generator for applying electrical stimulation to a living body.

(Prior art) Conventionally, when a living organism is given auditory stimulation by listening to thalassic music or listening to favorite music, it feels pleasure or displeasure through experiential ideas, or focuses consciousness on other things. It is known that it has the effect of alleviating or curing pain, stiff shoulders, and other discomforts. On the other hand, it is known that when electrical stimulation (transcutaneous stimulation (also referred to as skin stimulation)) is applied to a living body through the skin, pain, stiff shoulders, and other discomforts can be alleviated or cured.

It is also known that multiple stimulations are more refreshing than small stimulations, and irregular stimulations are more refreshing and have higher therapeutic effects than regular stimulations.

Based on these facts, research is being conducted on methods to reduce or treat pain sensation, stiffness, etc. using these stimuli.

Conventionally, techniques for generating electrical stimulation signals for applying this type of electrical stimulation to living organisms, particularly their sympathetic and parasympathetic nerves, have been proposed, for example, methods for generating electrical stimulation signals whose pulse frequency does not vary over time; is a special public official in 1984-1985.
There are devices disclosed in Publication No. 43 (Reference Engineering) and Japanese Utility Model Publication No. 56-22921 (Reference ■).

The technique disclosed in the literature is to frequency-analyze a music signal and adjust the frequency of an electrical stimulation signal within a range of 10 to 100 Hz according to the so-called 1/f fluctuation law, which states that the power spectral density of the signal is inversely proportional to the frequency f. This is a technique that generates electrical stimulation signals while changing the frequency in relatively long duration units such as 0.5 to 4 seconds.

The technique disclosed in Document H is to record an irregular pulse pattern in which the frequency of pulse occurrence and the duration of occurrence of the same pulse frequency as an electrical stimulation signal vary on a recording medium in advance, and to reproduce the pulse pattern from the recording medium. This is a technique to perform this according to the 1/f fluctuation law.

(Problems to be Solved by the Invention) By the way, if you listen to your favorite music, your nerves will synchronize with the tempo, and your tissues and cells will also synchronize with the same tempo, so you can enhance the effects of pain relief and the like. Therefore, by using the volume level (sound pressure level) as sound information, this effect makes it possible to apply skin stimulation to the living body in accordance with the tempo of the music.

However, since the above-mentioned conventional technology provides skin stimulation based on a frequency according to the 1/f fluctuation law of sound, there is a problem in that it is difficult to match this stimulation to the tempo of music.

Furthermore, the combination of auditory stimulation from music and sounds and skin stimulation (electrical stimulation) that reflects these sound information is far more effective in relieving psychogenic pain than using either stimulation alone. is known to be high. Furthermore, the effects of the treatment, etc. will be -Keio University if the auditory stimulation and the electrical stimulation are made to feel that there is no substantial time delay and the living body receives both stimulations in almost real time (real time).

However, according to the above-mentioned conventional techniques, it is not possible to give both stimuli to the living body as real-time stimulation, and because of this, the music or sound is paused (rest, etc.).
Even when the sound pressure (volume) is low, electrical stimulation is given to the living body, so it cannot be matched with the living body's empirical psychological relaxation, and therefore, from the living body's perspective, such electrical stimulation is There was a problem in that the patient felt nothing more than a constant change in the stimulation pattern, and the relief of pain and other therapeutic effects were not very specific.

In view of the above-mentioned conventional problems, the first object of the present invention is to provide a method for generating a low-frequency electrical stimulation signal that applies electrical stimulation (skin stimulation) to a living body in accordance with the tempo of auditory stimulation. be.

A second object of the present invention is to provide a method for generating a low frequency electrical stimulation signal that provides auditory stimulation and skin stimulation to a living body substantially in real time.

(Means for Solving the Problem) In order to achieve this objective, the low frequency electrical stimulation signal generator of the present invention samples the volume level from the sound source at a speed that the living body perceives as substantially real time. and converts each volume level obtained by the sampling into a corresponding frequency in the low frequency range and outputs it, as well as outputting necessary control information, and frequency modulation of current and voltage stimulation signals at this frequency. The present invention is characterized by comprising a stimulation signal generation section including a current control section and a voltage control section, respectively.

In implementing the present invention, the stimulation signal generation section includes a control method selection section that can be switched to output only either the current or voltage stimulation signal as an electrical stimulation signal based on control information from the control section described above. is preferable.

Furthermore, in implementing the present invention, the current control section includes a waveform generation section that outputs a voltage waveform signal with a frequency corresponding to the volume level, and a current stimulation signal that has the same waveform as the input voltage waveform signal. It is preferable to include a current stimulation generation circuit for outputting the current stimulation.

Furthermore, in the embodiment of the present invention, the voltage control section includes a waveform generation section that outputs a voltage waveform signal with a frequency corresponding to the volume level, and a voltage stimulation generation circuit that outputs the input voltage waveform signal as a voltage stimulation signal. It is suitable to include. In this case, it is preferable to share this waveform generating section with the waveform generating section of the current control section.

Furthermore, it is preferable that the low frequency frequency range is 0 to 60 Hz.

Furthermore, it is preferable to perform sampling at a period within a range of 0.01 to 0.5 seconds.

Furthermore, in a preferred embodiment of the present invention, the control section:
means for dividing the volume level into a plurality of stages; a ROM storing a volume level to frequency conversion table;
It is preferable to include means for reading out a frequency corresponding to the volume level of each sampling from M and outputting it.

Further, in a preferred embodiment of the present invention, it is preferable to set the volume level at a level of "0" when the level is "0" and when the level is low.

(Operation) As described above, according to the present invention, current or voltage control is performed based on the volume level of sound information to perform irregular modulation of the electrical stimulation signal. Therefore, it is possible to electrically stimulate the living body (transcutaneous stimulation) in accordance with the tempo of sound information such as music, or create a non-stimulation period with auditory stimulation when the music is paused or the volume level is low. I can do it. Therefore, it is possible to apply transcutaneous stimulation at a timing that the living body perceives as substantially real time, so that pain relief and therapeutic effects can be further enhanced in music therapy compared to conventional methods.

Furthermore, according to the embodiment of the present invention, since the volume level is sampled in a short cycle that the living body perceives as real time, it is possible to modulate the auditory stimulation and the electrical stimulation substantially in real time. Therefore, it is possible to reliably eliminate discomfort, alleviate pain effects, improve therapeutic effects, etc.

Further, according to the embodiment of the present invention, the frequency of the electrical stimulation signal is set to be a low frequency, for example, a frequency within the low frequency range of 0 to 60 Hz, so that the natural vibration of autonomic nerves (for example, as a defense against cold sensation) is set. The ``hair raising'' and ``trembling'' of hair are around 15Hz), which allows both the body and the body to relax.

(Embodiments) Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the basic configuration for explaining the present invention, and FIG. 2 is a block diagram showing a specific example of the configuration of a low frequency electrical stimulation signal generating device for explaining the present invention. be.

In FIG. 1, the low frequency electrical stimulation signal generation device basically includes a stimulation signal generation section 10 for generating a low frequency electrical stimulation signal and selects data necessary to operate this stimulation signal generation section 10. It includes a host section 12 for supplying stimulation signals, and an electrode section 14 for applying generated stimulation signals to a living body.

Description of Basic Configuration In this embodiment, the host section 12 includes a stimulation signal generation section 1
0, necessary conditions, such as amplitude (intensity), waveform, frequency, stimulation pattern, current control or control method such as current control, initial setting of electrode selection and other conditions, or adjustment of appropriate conditions, and stimulation signal generation. It mainly includes an input section 20 for inputting various signals for starting and the like.

Furthermore, this host unit 12 includes an appropriate sound source device that generates music, etc., a speaker that reproduces sound information from the sound source device,
It is also possible to provide an electroacoustic transducer such as earphones, or a display section 21 for visually displaying the generated electrical stimulation signal, and instead of providing these sound source devices in the host section 12, an external device (sound source device) can be provided. (indicated by 16), and may be configured so that it can be connected to the stimulation signal generating section 10.

In this embodiment, the stimulation signal generation unit 10 detects the volume level from the sound source device 16, and changes the physical quantity of the current and/or voltage stimulation signal, such as frequency, amplitude (intensity), etc., in response to the detected volume level. This type uses a current and/or voltage control method that controls the number of pulses while constantly modulating the electrical stimulation signal.

The configuration is such that it outputs a stimulation signal. In this case, the frequency of the electrical stimulation signal can be selected and set to a certain low frequency within the preset frequency range of about θ to 50 Hz, which is comfortable for the person using this device, so that the stimulation signal can be generated. It is preferable to configure. For this reason, the stimulation signal generating section 10 mainly includes a control unit including a CPU (central processing unit) for converting the volume level into a required control amount for controlling physical quantities and for controlling other required controls. 30, a current control section 40 that controls the current according to this control amount, a voltage control section 50 that controls the voltage according to this control amount, and a voltage stimulation signal and a current stimulation signal generated from the current control section 40 and the voltage control section 50. It includes a control method selection section 80 for selecting a control method, and an output section 70.

Furthermore, in this embodiment, this stimulation signal generating section 1
0 is approximately 200 when there is sound, regardless of the volume level.
A method for performing rhythm stimulation (also called rhythm modulation) by controlling the rhythm of electrical stimulation signals by controlling the waveforms of current and voltage using sound waveforms of Hz or less and sound waveforms generated in a pseudo manner when there is no sound. It includes a waveform control section 80.

Furthermore, in this embodiment, since the control unit 30 randomly switches between the current control method and the voltage control method regardless of music or sound information, the waveform and pulse that are the parameters of stimulation to the living body are controlled. width, frequency, intensity (amplitude),
It is provided with means for generating various control signals such as switching. With this control means, as will be described later, the pattern of the electrical stimulation signal of current or voltage can be set to any suitable stimulation pattern for each living body.

The specific configuration and control method shown in FIG. 2 will be explained below. In the figure, the same components as those shown in FIG. 1 will be described with the same reference numerals. Further, since the specific configuration and control method described in this embodiment are merely preferred examples, the present invention is not limited only to this embodiment.

Description of block circuit> In FIG. 2, sound information from a sound source device 16 such as a radio, television, or other sound @ device is sent to a volume to DC level converter 91 via an amplifier 80, and the resulting volume level signal is The signal is sent to the A/D converter 82.

On the other hand, the output from the amplifier 90 is sent through an electronic volume 93 whose volume can be adjusted using an external switch SW and an amplifier 84 to an electroacoustic transducer 95 such as a speaker or earphone for reproduction, thereby providing auditory stimulation. Note that these reproduction systems do not necessarily need to be provided in this electrical stimulation device, and those provided in the external sound source device 18 may be used.

Also, if necessary, the output of the amplifier 94 can be changed to D on the display section 21.
After passing through the C converter 22, a light emitting display unit 2 such as an LED is displayed.
3 can be configured to display changes in sound information. In addition, this light emitting display section 23 is connected to the host section 1.
2 may be provided.

In this embodiment, the control unit 30 includes a serial interface 31 that receives signals from the input unit 20 of the host unit 12 wirelessly or by wire, and a CPU 32 that performs various processes in response to the signals from this interface 31. A RAM (Random Access Memory) 33 to which data necessary for processing by the CPU 32 is written and read as required, and the CPU 3
ROM (read only memory) 34, which stores data necessary for the processing in step 2 in advance and reads it out when necessary;
A PTM (programmable time unit) 35 automatically outputs an arbitrary frequency as an internal clock in response to data set by the CPU 32, and a programmable time unit (PTM) 35 for outputting outputs including various control signals from the control section 30 to other components. It mainly includes an output port 38 and an input port 37 that receives an input to the control unit 30, for example, a signal from the PTM 35 for detecting the end of one frequency cycle.

A portion of the output from output port 36 is supplied to pulse number generator 96.
This is sent as a control signal to the PTM 35 and the pulse number generator 96 as well as to the signal changeover switch 87.

In this embodiment, the current control section 40 and the voltage control section 50 each commonly include a waveform generation section 41 and a waveform selection section 42 composed of, for example, an electronic switch for selectively extracting the generated voltage waveform. A frequency or pulse number control signal is sent to the frequency clock section 43 of this waveform generating section 41 via the changeover switch 97, and the output port 3
6 sends a frequency control signal. Furthermore, data for changing the pulse width of the voltage waveform to be generated is sent from the output port to the pulse width data section 44 of this circuit 41.

This waveform generating section 41 is provided with a waveform generating circuit 45 .

This waveform generation circuit 45 includes a large number of circuits that can individually output signals of various voltage waveforms as shown in FIGS. It is configured such that it can be controlled by a signal from the pulse width data section 44, and the width of the signal can be changed by data from the pulse width data section 44. Such waveform generation circuit 45, frequency clock section 43, and pulse width data section 44 can be easily formed using conventional electronic circuit technology, and there is no need for any special circuit configuration. A control signal from the output port 36 is used as a waveform select signal to determine whether at least one or two or more of these waveform generation circuits 45 are to be operated to output one or more required voltage waveform patterns. The structure is such that you can choose according to your preferences. Further, one or two types of voltage waveform patterns outputted from the waveform generation section 41 are configured to be selected and extracted in the waveform selection section 42 based on the waveform selection signal from the output port 36. The circuit configuration of this waveform selection section 42 can also be easily configured using conventional electronic circuit technology, and there is no need for this circuit to have any special circuit configuration.

One of the voltage waveform signals selected by the waveform selection section 42 is supplied to the current stimulation generation circuit 47 via the intensity (amplitude) setting circuit 46 of the current control section 40 . Further, the other voltage waveform signal is supplied to the voltage stimulus generation circuit 51 of the voltage control section 50.

In the current control unit 40, the voltage waveform signal input to the intensity setting circuit 46 is set to an arbitrary suitable amplitude by the control signal from the output port 36, and the input voltage waveform pattern is maintained in the current stimulation generation circuit 47. In other words, it converts into an electrical stimulation signal with a current waveform having the same pattern as the voltage waveform and outputs it.

On the other hand, in the voltage control section 50, the voltage waveform signal inputted to the supply voltage stimulation generation circuit 51 via the waveform selection section 42 is arbitrarily selected according to the intensity (amplitude) and frequency control signal from the output port 3B. The intensity and/or frequency is changed and output as a voltage waveform electrical stimulation signal.

Furthermore, in this embodiment, these current control and voltage fl
A control method selection unit 80 is provided for selecting which method of J1m to apply an electrical stimulation signal to be applied to the living body as skin stimulation. This selection can be performed by a selection method control signal from the output port 36, and depending on the need, only one of the current control method or voltage control method is selected, or the re-control method is randomly alternated. It is structured so that it can be selected.

The electrical stimulation signal obtained through this control method selection section 80 is sent to the output section 70 of this low frequency electrical stimulation signal generator.

This output unit 70 is connected to electrodes for applying skin stimulation to one or more required locations on the living body, and which electrode is selected can be controlled by an electrode selection control signal from the output port 36. Configure.

Further, in this embodiment, the waveform control section 80 includes a comparator 8 for detecting sound information from the amplifier 90.
1. A low-pass filter 82 that passes sound information of approximately 200 Hz or less, a rhythm generator 83 that generates a pseudo sound wave during the pause period of the sound information, and a rhythm generator 83 that generates approximately 200 Hz of sound information from the low-pass filter 82 when the comparator 81 detects sound information.
A selection switch 84 is provided for selecting sound information of Hz or less and, if not detected, selecting pseudo-sound information of the rhythm generator and sending it to the waveform selection section 42 as a rhythm modulation (stimulation) waveform. On the other hand, this sound information is sent to the control section via the A/D converter 92 as a rhythm stimulation display signal.
The configuration is such that the rhythm can be displayed on the display section 21 in response to a control signal from the output port.

Control Method for Generating Electrical Stimulation Signal In the present invention, the frequency of the electrical stimulation signal for stimulating the skin is set to a low frequency. In this case, the frequency range is approximately θ to 60 Hz, which the living body feels comfortable with. This method modulates the electrical stimulation signal by controlling one or both of current control and voltage control corresponding to the volume level from the sound source.

In the case of this electric control method, the cells of the living body sense the charge as energy, and in the case of the voltage control method, the voltage is oscillated, so less current is required for the same physical sensation, which is good for the nerves.Which control method is better? It is also known that it gives a unique sense of pleasure to living organisms.

In the embodiment of the present invention, (1) When modulating the electrical stimulation signal by controlling the frequency, amplitude, and number of pulses of current and voltage in relation to the volume level, (2) Modulating the electrical stimulation signal at approximately 200 Hz or less without using the volume level. When performing rhythm modulation of electrical stimulation signals by controlling current and voltage by using sound waveforms and pseudo-soundwave shapes at appropriate times, ■Various controls that can be set in advance in the control unit without using sound information Stimulation pattern modulation of electrical stimulation signals may be performed by controlling current and voltage patterns based on a combination of information (waveform, frequency, amplitude).

In the following description, further reference will be made to FIGS. 4 to 16. Figure 4 is a diagram explaining table conversion, Figure 5 is CP
The functional block diagrams of U32, FIGS. 6 to 14, are flowcharts of operations, and each processing step is indicated by S.

[I] Frequency modulation using volume level> First, the power switch is turned on and the sound source device 1B is activated to generate sound information such as music and provide auditory stimulation.

The sound information from the sound source device IB is converted into a volume to DC level converter 9.
1 and an A/D converter 92 in real time to convert the volume level into 8-bit data as shown in the upper column of FIG. 4, for example.

On the other hand, the input section 20 (for example, input key) of the host section 12
In this way, necessary initial information such as modulation, waveform, frequency, electrode selection, control method, etc. is input to the control section 30 of the stimulation signal generation section 10 as treatment data. Based on this initial information, the setting means 102 of the CPU 32 performs processing (
Sl), the corresponding control information is read from the ROM 34 or converted into required control information, and the control information is sent to each corresponding component from the output port 36 (S2) to set initial conditions.

For example, a waveform select signal is sent to the waveform generation section 41 to activate the waveform generation circuit 45, and the pulse width data section 44
The control signal is sent to the controller to initialize the appropriate pulse width.

In addition, the initial frequency information is sent to the frequency clock section 43, and the voltage waveform signal from the waveform generation circuit 45 is set to a frequency, for example, 30Hz, at which the living body feels maximum stimulation when the waveforms of the electrical stimulation signals are the same. Initialize the frequency. The initial setting of this frequency is set regardless of the presence or absence of sound information from the sound source device 16.

At the same time, a control signal is sent to the voltage control and current control method selection section 60 to select an electrical stimulation signal based on one of the control methods.

Furthermore, the intensity of these electrical stimulation signals is set each time by sending a control signal read from the ROM 34 to the intensity setting circuit 46 and the voltage stimulation generation circuit 51 according to the selection at the input section 20. This intensity can be adjusted and set until the user feels comfortable.

When the stimulation intensity becomes appropriate, the start key of the input section 20 of the host section 12 is turned on, a start input is sent to the control section 30, and treatment start data is sent to the stimulation signal generation section 10 through the processing of the CPU 32 (S3 ), the control unit 30 is A
/D converter 92 starts capturing the volume level (S4). This acquisition is performed by sampling by the CPU 32, and each volume level obtained for each sampling is once written to the RAM 33 (S5), and the RA
Sequentially read from M32 to CPU32), CPU3
In step 2, the volume level of the 8-bit data is converted into 16 levels (S7). During this level conversion, not only when the volume is "0", but also when the volume is low, the electrical stimulation signal intensity is forced to the "0" level. The 16 volume levels are each converted to a corresponding frequency in the low frequency range (S8). This conversion is
For example, a table of conversion frequencies corresponding to each volume level is stored in advance in the ROM 34, and the corresponding frequency is read out by comparing it with the frequency conversion table for each volume level (S8). This frequency information is sent to the corresponding component via the output port 36 (S9). In this case, sampling is preferably performed at a rate that the living body perceives as substantially real time, for example, at a period within a range of about 0.01 to 0.5 seconds. In addition, one frequency conversion table, for example, as shown in Figure 4, for each of the 16 volume levels, the range of 0 to 60H2, preferably the range of 0 to 30Hz, which is the stimulation frequency that the living body feels most comfortable. Assign individual frequencies within. For example, as can be understood from Figure 4, the volume level "0" is 1.5Hz.
, "1" is 2Hz1, , r5J is 5Hz, "" rlO
J is 10Hz, "11" is 15Hz, *I 6 r
15J is set to 30Hz. In this way, the CPU 32 is equipped with a converting means 102 (FIG. 5) that performs such sampling and converts the frequency.

When the volume level is frequency-converted for each sample and sequentially output from the output port 3B, this frequency is converted to the waveform generator 4.
The frequency is supplied to the frequency clock unit 43 and the voltage stimulation generation circuit 51 of 1, and the initial set frequency is updated to a new frequency that immediately corresponds to the volume level that is sequentially sent.Therefore, the frequency control of current or voltage is performed. frequency modulation of the electrical stimulation signal is automatically achieved.

In this way, the music φ sound is used as an auditory stimulus, and the volume level from the sound source device 1B is sampled substantially in real time with the auditory stimulus, and at the same time as this sampling time, electricity is always generated at a frequency corresponding to the volume level. Transcutaneous stimulation is provided by modulating the frequency of the stimulation signal.

The biggest feature of this frequency modulation is near real-time sampling and electrical stimulation (
Compatible with transdermal stimulation. ) in the settings. In this embodiment, when the volume (sound pressure) level is rOJ or an extremely low level (less than 1/16 of the maximum level), the frequency is set to, for example, 1.5 Hz or less. In this way, the waiting time until the next stimulus when the music is paused or the volume is low is
For example, IHz is 1 second, 0.5Hz is 2 seconds, 0.25
In Hz, it is 4 seconds. Therefore, in terms of actual music, transcutaneous stimulation is not performed when the music is at rest or when the volume is low. Since the non-stimulation time of this transcutaneous stimulation is substantially synchronized with the non-stimulation time of auditory stimulation, the cerebral cortex is innervated by the music world based on experiential ideas due to the music you like, and you feel pain. This prevents this from occurring, increasing the therapeutic effect.

By the way, when the waiting time until the next transdermal stimulation becomes longer,
In fact, there are cases in which there is no immediate response to auditory stimuli. Therefore,
In this embodiment, the control unit 30 of the stimulation signal generation unit 10:
The frequency forced conversion means 103 constantly monitors this waiting time based on the conversion frequency and the volume level, and if the waiting time becomes longer, the frequency forced conversion means 103 is configured to forcibly convert the frequency to the frequency corresponding to the newly sampled volume level. equip

An example of the flow of operation of this frequency forced conversion means 103 will be explained using FIG. 8.

First, the sampled volume level is 16, which is the maximum level.
A judgment process is performed to determine whether the volume level is less than 1/200% (510), and if yes (Y), the treatment intensity level of the volume level is set to "O".
Set to step (S11), if no (N),
Perform a process to determine whether the current frequency is, for example, 5 Hz or less (S12) Next, if the frequency is higher than 5 Hz, perform a process to determine whether one cycle of this frequency has ended ( 513), if one cycle has not been completed, the treatment intensity is set to the set intensity (initial setting intensity) (31B), if one cycle has been completed, the volume level is obtained at the next sampling. 315) and output it through step 31B.If the current frequency is 5 Hz or less in the determination process in step 313, the frequency is converted to a frequency corresponding to the volume level at the previous sampling. Comparatively 514),
If the current volume level is higher, step S15
In the process of 31B, the frequency is forcibly set to correspond to the current volume level, and then the process of 31B is performed and output.

Also, if the current volume level is low, step 51
Perform processing B. This series of processing is always performed while the electrical stimulation signal generating device is in operation, and in the above-mentioned embodiment,
Although a case has been described in which the conversion means 102 and the frequency forced conversion means 103 are provided as separate functional blocks, a configuration in which the frequency forced conversion means 103 is incorporated into the conversion means 102 is also possible. Further, the operation flow is not limited to the above-described flow, and a different flow may be used.

Amplitude modulation> First, as in the case of frequency modulation, initial settings are made (Figures 5 and 6). In this case, the initial setting intensity is the maximum intensity that gives maximum stimulation to the living body, This is the setting strength. This setting strength is written in the RAM 33 and can be read out at any time.

Next, when the volume level of the 8-bit data is sequentially captured by sampling, the setting intensity is set to 0-100% of the volume level.
is sequentially updated in real time to the intensity (amplitude) corresponding to this newly captured volume level within the range of , thus achieving amplitude modulation of the electrical stimulation signal and thus achieving modulation of the transcutaneous stimulation intensity. I can do it. This amplitude (intensity) conversion is performed constantly.

In this embodiment, this amplitude modulation can be mainly performed using the treatment intensity setting means 104 of the CPU 32.

This amplitude modulation process (see FIG. 9) is first performed in the RAM 33.
520), and then read out the setting strength from this RAM3.
Read the volume level of 3 or 8 bit data (S21)
. Next, in order to calculate the following equation (I), the 8-bit data of this volume level is divided by 256, and the resulting quotient is multiplied by the set intensity to calculate the treatment intensity, that is, the amplitude control value ( S22), but this calculation process is not limited to this.

Treatment intensity = setting intensity x ((8-bit data of volume level) 725G)・
- Number (I) In this case, preferably the amplitude control value is 0 of the set intensity.
It is preferable to set it so that 24 levels of electrical stimulation signal strength can be obtained within the range of ~100%.

Further, if the volume level of music/sound is "0" or extremely low, the electric stimulation signal intensity is forcibly set to "0".

However, even if this intensity is not set to rOJ, if the volume level is low, the intensity will also be low, so it will not be felt as a living body, and the bodily sensation will match the music/sound.

In addition, although an example has been described in which arithmetic processing is performed by the functional block of the treatment intensity setting means 104, the treatment intensity (amplitude control value) is stored in the ROM 34 as a conversion table, and this conversion table is read out and converted to the treatment intensity. It's okay.

The amplitude control value obtained in this way is outputted from the output boat 3B to the intensity setting circuit 46 and the voltage stimulation generation circuit 51.
modulate the amplitude of the current and voltage stimulation signals. In this case, as in the case of frequency modulation, the control method selection section 60 selects either the current control method or the voltage control method.

In the case of this amplitude modulation, as in the case of frequency modulation, the volume level from the sound source device is sampled in substantially real time with the auditory stimulation, and the amplitude is converted at the same time as the sampling time to convert the amplitude of the electrical stimulation signal. Setting strength 0~
It is set in real time within a range of 100%.

The feature of this amplitude modulation is that output stimulation is not performed when the music is paused or the volume is low, and similarly to frequency modulation, it is possible to create a non-stimulation period for transcutaneous stimulation in time with the music. , its effects are significant in music therapy.

Pulse number modulation> In this case as well, initial settings are performed in the same way as in the case of frequency modulation described above, but instead of the frequency, the pulse number generator 9B generates, for example, 16 pulses/second (corresponding to 30 Hz). Initial settings are made to generate pulses at a pulse speed of (FIGS. 5 and 6).

Next, when the volume level of the 8-bit data is sequentially captured by sampling, the number of pulses corresponding to this newly captured volume level is sequentially executed within the range from the initial setting pulse number to the maximum pulse number. It is updated in time, thus achieving control of the electrical stimulation signal and thus achieving pulse number control of transcutaneous stimulation. This pulse number modulation is always performed.

In this embodiment, this pulse number modulation can be mainly performed using the pulse number setting means 105 of the CPU 32.

Pulse number modulation processing (see Figure 1O) first begins with RAM3.
Read the volume level divided into 3 to 16 levels (323), and then store the corresponding pulse number conversion value in the ROM.
34, the table is converted and obtained (S24), and then the calculation according to the following equation (II) is performed (S25).

Pulse number control value = (16-step conversion value - 1) (II) According to this embodiment, the pulse number control value is calculated according to equation (II), and this is used to generate the pulse number from the output boat 36. The signal is then sent to the frequency clock section 43 of the waveform generation section 41 via the selection switch 97, which generates a pulse at a corresponding pulse rate in immediate response to the sampled volume level. Therefore, the pulse rate at which the current and voltage stimulation signals are generated as pulses can be controlled. In this case, the number of pulses should preferably be set to θ that the living body feels comfortable with.
It is preferable to set the number within the range of ~30 pieces/second.

According to this formula, the number of pulses becomes "0" when the music is at rest or when the volume is low.

Note that the calculation of the pulse number control value is not limited to formula (II), and other calculation methods may be used.Instead of these calculations, the pulse number control value corresponding to the volume level may be stored in the ROM 34 in a table format. It is also possible to store it in , and convert it into a table to find it.

Even when pulse number modulation is performed in this manner, it is possible to provide percutaneous stimulation substantially in real time with auditory stimulation, as in the case of frequency modulation described above.

[11 Unused rhythm modulation of volume level] This process will be explained (Fig. 11). In this case,
modulated as treatment data from the input unit 20 of the host unit 12;
Setting conditions such as waveform, stimulation pattern, control method, electrode selection, etc. are input into the information section 30. This process will be explained.

As in the case of frequency modulation and the like described above, initial settings are performed based on these setting conditions. During this initial setting, a waveform with a large wave height is used in order to make it easier to feel the 1 intensity strongly. Then, for example, the treatment is started when a stimulation pattern that the living body feels is optimal stimulation is reached. First, the modulation method setting means 10B of the CPU 32 sends rhythm modulation command information from the output boat to the waveform control section 80, and activates the waveform control section 80 (S30). ), if this is being output, the comparator 81 detects this by, for example, level comparison, switches the switch 84 to the low-pass filter 82, and sends the sound information of approximately 200 Hz or less as a rhythm modulation waveform to the waveform selection section 42' ( On the other hand, if there is no sound information, the comparator 81 sends the pseudo sound waveform from the rhythm generator 83 to the waveform selection section 42 as a rhythm modulation waveform (S33). next,
In response to a command from the modulation method setting means 10B, the waveform selection section 42 is switched and set to select only the rhythm modulation waveform and send it to the subsequent stage (S34).

The waveform selection section 42 sends the signal to the voltage stimulation generation circuit 51 and also sends it to the current stimulation generation circuit 47 via the intensity setting circuit 48 (332). Both rhythm modulation waveforms control the rhythm and/or intensity of the current and voltage stimulation signals, respectively. (S33
), the signal is output as an electrical stimulation signal using either current or voltage control as in the case of the other modulation methods described above.

Therefore, rhythmic and intense stimulation can be given to the living body.

In this embodiment, the low-pass filter 81 with a frequency of approximately 200 Hz or less is used because the stimulation obtained with the stimulation pattern of the frequency in that range is a stimulation that matches the bass and drums.

This rhythm stimulation can also alleviate or treat the discomfort of the living body.

[Alternate switching of current and voltage control method for stimulation pattern modulation without using ML sound source device] In this case, the control unit 30 is configured to automatically change the selected parameters of the stimulation pattern regardless of the music. Out. Typical stimulation parameters include waveform, pulse width, frequency, and intensity.

In this embodiment, stimulation pattern modulation processing will be explained using two examples in which one frequency and one intensity are variable parameters (FIGS. 2, 5, and 12).

First, the initial setting values of each parameter and the variable parameter values of frequency and intensity are stored in the ROM 34 in advance.

This stimulation pattern modulation process will be explained.

■ Frequency Variability As in the case of each modulation method described above, the modulation method setting means 10B commands stimulation parameter modulation according to a command from the input section 20 (340), and the initial setting of waveform, pulse width and intensity is performed by the setting means 101. perform (341)
, Next, based on this command, the stimulation parameter setting means 10
7 is activated to read the frequency from the ROM 34, and outputs it from the output port 36 to the waveform generation section 41 and voltage stimulation generation circuit 51 (S42). This frequency may be fixed or may vary randomly. Next, the electrical stimulation signal is controlled in the same way as in the case of frequency modulation described above (S43).
Next, based on the modulation method selected by the modulation method setting means 106, the current and voltage stimulation signals are alternately output from the means 106 to the control method selection section 60 at a constant or random switching speed. A command is given to output these stimulation signals alternately (S44), so that
It is possible to give alternating stimulation to living organisms. This alternating change is read out from the ROM 34 and output according to a command from the input section 20. This process can also be performed by the setting means 101.

(2) Intensity Variation In this case, the processing is basically the same as in the case of frequency variation described above, so it is sufficient to perform the processing in which frequency is replaced with intensity (amplitude) in FIG. 12. but,
To initialize the frequency, a control signal is sent from the setting means 101 to the PTM 35, and the PTM 35 automatically locks the frequency. By varying the intensity, the stimulation pattern can be modulated and alternate stimulation can be applied to the living body.

Thus, in any type of stimulation pattern modulation, the stimulation pattern is controlled by a program stored in the CPU 32 in advance.

By the way, in the case of this stimulation pattern modulation, the current and voltage stimulation signals are alternately switched, and the switching time is several seconds to several minutes, but preferably about 2 seconds to 1 minute. .

The reason why such alternating stimulation is provided by alternating switching is as follows. For example, if biological stimulation is performed using current control with a sine wave or exponential waveform and voltage control with a square wave or needle waveform, no stimulation will occur under current control even if the current value is the same as during voltage control. Even if the living body feels unstimulated, electric current control imparts an electric charge to the living body, so current stimulation is effective during anesthesia, children, or people who dislike electricity. However, since current stimulation alone does not produce any sensation, a sensitive stimulation is provided by alternately switching between voltage and current stimulation.

Flow of main control operations of this device FIG. 13 is a diagram showing an example of the flow of main operations of this device.

First, it is determined whether a signal is being received from the input unit 20 (550), and if the signal is being received, the determination data and each data are set, and if the signal is not being received, the next step is performed directly. Proceed to frequency modulation processing.

Next, it is determined whether or not it is frequency modulation (S52). If there is a command, frequency modulation processing is performed (S52).
3) If there is no such command, the process directly proceeds to the next process.

Next, it is determined whether or not it is amplitude modulation (S54), and if there is such a command, amplitude modulation processing is performed (355).
, or if there is no such command, the process directly proceeds to the next process.

Next, it is determined whether rhythm modulation is required (35B), and if there is a command for that, rhythm modulation processing is performed (S57).
), or if there is no such command, the process directly proceeds to the next process.

Next, it is determined whether or not pulse width modulation is required (S58), and if there is a command for this, frequency modulation processing is performed (S58).
59), or if there is no such command, the process directly proceeds to the next process.

Next, it is determined whether or not there is no modulation (seo), and if there is no modulation command, processing is performed to indicate no modulation (set
), or if there is such a command, proceed directly to the next process.

Next, other necessary processing, including stimulation pattern processing, etc., is controlled.

Note that this process is repeatedly performed during the operation of this device. In addition, the type of each modulation method and the process for determining its presence or absence are described in C.
This is performed by the modulation method setting means 1013 of the PU 32, and the results are sent as signals to the frequency forced conversion means 0103, treatment intensity setting means 104, pulse number setting means and stimulation parameter setting means 107, respectively, to start their respective processes.

Processing of Volume Level Data in CPU The volume level data input from the A/D converter 43 to the CPU 32 in FIG. Convert the data value into 8-bit data with 258 steps and set it in the RAM 33 (3133), convert this set data into 16 steps and set it in another area of the RAM 33 (S60° Current stimulation generation circuit and current Stimulus generation circuit Next, the current stimulation generation circuit 47 and the voltage stimulation generation circuit 5 explained in FIG.
1 will be briefly explained with reference to FIGS. 15 and 16.

Both of these circuits 47 and 51 can be easily assembled in a hardware configuration using conventionally known electronic circuit technology.

■Current stimulation generation circuit FIG. 15 shows a block diagram of an example of this circuit.

As already explained, this circuit is a circuit that outputs a current having the same waveform as the input voltage waveform.

This circuit is a circuit mainly using, for example, an operational amplifier, a photocoupler, a Darlington circuit, etc.
, a second stage 120 and a third stage 130.

In order to convert a voltage waveform into a current waveform at a constant voltage level, the first stage 110 is configured by combining an operational amplifier 111 and a photocoupler light emitting element 112, and converts an input voltage into an optical output.

The second stage 120 includes a photocoupler light receiving element 121.

It is composed of a current-to-voltage conversion circuit 122 that converts the current from the light receiving element into voltage, and an operational amplifier 123 that amplifies the voltage, and outputs the voltage.

The third stage 130 further amplifies the voltage with an operational amplifier 131 and then sends it to the Darlington circuit where it is converted into a current.

This generates an output current. At this time, by feeding back the output of the Darlington circuit 132 to the operational amplifier 131 side, even if the impedance of the biological body to which this output current is applied changes, the current can be output with a waveform that always matches the input voltage waveform. be.

The circuit configuration of this current stimulation generating circuit 46 is not limited to the configuration of this embodiment in any way, and other configurations may be used.

゛ ■ Voltage stimulus generation circuit This circuit is a circuit that simply amplifies the input voltage. For example, an example of its configuration is shown in a block diagram in FIG. It is configured with an amplifier 142, and outputs a voltage whose amplitude and/or frequency of the input voltage is changed as required.

This circuit 51 is also not limited to the circuit configuration of the embodiment described above, and may have other configurations.

The configuration of the control and/or device for achieving the present invention is not limited to the method and configuration described in the above-described embodiments, and it is clear that various changes can be made within the scope of the present invention.

For example, the configuration of the device shown in FIG. 2 and the like may be other configurations, and its operating method is not limited to the operating procedure described above.

It is also possible to generate an electrical stimulation signal by arbitrarily combining the frequency modulation, amplitude modulation, pulse modulation, rhythm modulation, and stimulation pattern variation m (alternate stimulation) described above.

(Effects of the Invention) As is clear from the above description, according to the present invention, low-frequency electrical stimulation corresponding to the volume (sound pressure) level of music/sound can be applied to a living body using either current or voltage control method. Since the structure is such that the medicine is applied to the living body substantially in real time by alternating between the two, the pain relief and therapeutic effects are more reliable and greater than in the case of the conventional method based on the 1/f fluctuation law.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a block diagram showing the basic configuration of a low-frequency electrical stimulation generating device used to explain the present invention, and Fig. 2 shows a specific example of the low-frequency electrical stimulation generating device used to explain the present invention. A block diagram showing a configuration example, FIG. 3 is a voltage waveform diagram to explain the present invention, FIG. 4 is a diagram showing a frequency conversion table to explain the invention, and FIG. 5 mainly shows the CPU 6 to 14 are flowcharts of operations to explain the present invention. FIG. 15 is a block diagram showing an example of the configuration of a current stimulation generation circuit to explain the present invention. , FIG. 16 is a block diagram showing an example of the configuration of a voltage stimulation generating circuit for explaining the present invention. 10... Stimulus signal generation section, 12... Host section 20
...Input section, 30...Control section 40...
Current control section, 50... Voltage control section 60... Control method selection section, 70... Output section 80... Waveform control section. 47' Low, 7U Figure 1, ＼ノ -ノ
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Claims (8)

[Claims] (1) In an electrical stimulation signal generation device for applying electrical stimulation to a living body, the volume level from the sound source is sampled at a speed that the living body perceives as practically real time, and each volume level obtained by the sampling is reduced. Stimulation signal generation, including a control unit that converts the signal into a corresponding frequency in the frequency domain and outputs it as well as outputs required control information, and a current and voltage control unit that performs frequency modulation of the current and voltage stimulation signals at the frequency, respectively. A low frequency electrical stimulation signal generating device comprising: (2) The stimulation signal generation section is characterized in that it includes a control method selection section that is switched to output only either the current or voltage stimulation signal as an electrical stimulation signal based on control information from the control section. A low frequency electrical stimulation signal generating device according to claim 1. (3) The current control unit includes a waveform generation unit that outputs a voltage waveform signal with a frequency corresponding to the volume level, and a current stimulation generation unit that outputs a current stimulation signal with the same waveform as the input voltage waveform signal. A low frequency electrical stimulation signal generating device according to claim 1 or 2, characterized in that it includes a circuit. (4) The voltage control section includes a waveform generation section that outputs a voltage waveform signal with a frequency corresponding to the volume level, and a voltage stimulation generation circuit that outputs the input voltage waveform signal as a voltage stimulation signal. A low frequency electrical stimulation signal generating device according to any one of claims 1 to 3. (5) The low frequency electrical stimulation signal generating device according to any one of claims 1 to 4, wherein the low frequency frequency range is 0 to 60 Hz. (6) The sampling is performed at a period within a range of 0.01 to 0.5 seconds.
The low frequency electrical stimulation signal generator according to any one of Item 5. (7) The control unit includes means for dividing the volume level into a plurality of stages, a ROM in which a volume level to frequency conversion table is stored, and a ROM that reads a frequency corresponding to the volume level for each sampling from the ROM. Claims 1 to 6, characterized in that the invention comprises a means for outputting.
The low frequency electrical stimulation signal generator according to any one of the items. (8) The volume level is set to a volume level of "0" when the level is "0" level and when it is a low level. Frequency electrical stimulation signal generator.