Stimulation intensity dynamic adjustment method and device

Abstract

The invention provides a method and equipment for dynamically adjusting stimulation intensity, which solves the problems of working safety and the like of electrical stimulation equipment, and comprises the following steps of: setting duty ratios of two initial periods, outputting stimulation current, detecting voltage at the end of the periods, solving load resistance through the voltage and the current, and providing a recursive formula to solve the duty ratio of the next period. The duty ratio is dynamically adjusted through detection and calculation, whether the load resistance is smaller than the threshold resistance or not is judged, and timely stopping is carried out to guarantee the working safety of equipment. The device has the advantages of high working safety, good stability and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of electrotherapy equipment control, and in particular relates to a method and equipment for dynamically adjusting stimulation intensity. Background Art

[0002] Existing electrical stimulation devices stimulate tissues by generating continuous electric current. The core of the electrical device is to control the safety and reliability of voltage and current, and the corresponding usage procedures are programmed accordingly. Its intensity control is controlled by a current regulator, which adjusts the total stimulation energy received by the user, usually changing the voltage / resistance to achieve the required current output. However, in actual use, if the existing electrical stimulation device has an abnormal state such as a short circuit, it is easy to cause damage due to excessive stimulation intensity.

[0003] In order to solve the deficiencies of the existing technology, people have conducted long-term exploration and proposed various solutions. For example, a Chinese patent document discloses an autonomic nerve electrical stimulator [202210896475.8], which controls the first voltage conversion module to convert the power supply signal input from the power supply input end into a voltage signal of corresponding intensity through the controller output voltage control signal, and outputs it to the output control module; the output control module, under the control of the pulse control signal output by the controller, converts the voltage signal into a bidirectional pulse signal output, realizes the output of low-frequency electrical pulses, and realizes non-invasive regulation of the autonomic nerves.

[0004] The above solution solves the problem of pulse output intensity regulation to a certain extent, but the solution still has many shortcomings, such as poor working safety of the electrical stimulation device. Summary of the invention

[0005] The purpose of the present invention is to provide a method for dynamically adjusting the stimulation intensity with a reasonable design to ensure the safety of electrical stimulation in order to solve the above problems.

[0006] Another object of the present invention is to provide a device for dynamically adjusting stimulation intensity with stable operation in order to solve the above-mentioned problems.

[0007] To achieve the above object, the present invention adopts the following technical solution: a method for dynamically adjusting stimulation intensity, comprising the following steps: S1: Set circuit parameters; S2: The device outputs the control circuit output intensity through the constant current power supply. The stimulation current can be detected synchronously by the self-detection circuit in the device at the end of this cycle. ,according to and The load resistance can be calculated , the calculation formula is as follows: ; S3: Calculate the duty cycle of the next cycle using the recursive formula: ; , are the maximum duty cycle and the minimum duty cycle respectively. ,but ;when When ; is the control coefficient, The larger it is, the faster the regulation speed is; S4: Starting from the third cycle, the duty cycle of the stimulation waveform is adjusted to , while continuously detecting and calculating to achieve dynamic adjustment of the duty cycle; S5: Judgment Is it less than the threshold resistance? If yes, it means the user's neural pathway is good, preventing extreme situations caused by equipment short circuit and other problems, and stimulating to the maximum stimulation time under this duty cycle Finish.

[0008] In the above-mentioned method for dynamic adjustment of stimulation intensity, the duty cycle in step S1 is limited in the following manner to determine , Values: S11: Duty cycle saturation is modeled as follows: ; S12: Introduce the adjustment coefficient into the expression of step S21 ,expression becomes: .

[0009] A device for dynamically adjusting stimulation intensity comprises a load unit, wherein the load unit is connected with a constant current control unit and a voltage detection unit, and the constant current control unit is connected with a power input unit.

[0010] In the above-mentioned device for dynamically adjusting stimulation intensity, the power input unit has a built-in BOOST circuit.

[0011] In the above-mentioned device for dynamically adjusting the intensity of stimulation, the constant current control unit has a built-in PWM switch control circuit.

[0012] In the above-mentioned device for dynamically adjusting stimulation intensity, the voltage detection unit has a built-in detection circuit.

[0013] In the above-mentioned device for dynamically adjusting the stimulation intensity, the constant current control unit is grounded.

[0014] Compared with the existing technology, the advantages of the present invention are: using a recursive method to periodically detect the current duty cycle, stopping electrical stimulation in time by judging the threshold, and improving the safety of equipment use; adjusting the built-in constant current control unit and voltage detection unit of the device to meet the current output control and voltage detection requirements, ensuring that the current duty cycle can be adjusted normally and dynamically. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the method of the present invention.

[0016] Figure 2 It is a schematic diagram of the device of the present invention.

[0017] Figure 3 It is a duty cycle schematic diagram of the present invention.

[0018] Figure 4 It is a structural diagram of the present invention.

[0019] In the figure, there are a load unit 1 , a constant current control unit 2 , a PWM switch control circuit 21 , a voltage detection unit 3 , a detection circuit 31 , a power input unit 4 , and a BOOST circuit 41 . DETAILED DESCRIPTION

[0020] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] like Figure 1 As shown, a method for dynamically adjusting stimulation intensity includes the following steps: S1: Set circuit parameters, including setting stimulation current , total stimulation duration , the duty cycle of the initial two cycles , , and its calculation formula is as follows: ; Since the tissue is constantly changing, the same duty cycle is used to stimulate two cycles and the measured , It is also different, but if and If the gap is too small, the system may not be able to oscillate, so the initial two cycles are still set to expand and The gap between them avoids this problem; S2: Figure 4 As shown, the device outputs the output intensity of the control circuit through the constant current power supply output The stimulation current can be detected synchronously by the self-detection circuit in the device at the end of this cycle. ,according to and The load resistance can be calculated , the calculation formula is as follows: ; S3: Calculate the duty cycle of the next cycle using the recursive formula: ; , are the maximum duty cycle and the minimum duty cycle respectively. ,but ;when When ; is the control coefficient, The larger it is, the faster the regulation speed is; According to relevant literature records, 10% duty cycle is the most common and is a common parameter in the industry, but some literature has conducted research on duty cycles of 1-40%. Therefore, under normal circumstances, the duty cycle setting will not exceed 40%.

[0022] S4: Starting from the third cycle, the duty cycle of the stimulation waveform is adjusted to , while continuously detecting and calculating to achieve dynamic adjustment of the duty cycle; S5: Judgment Is it less than the threshold resistance? If yes, it means the user's neural pathway is good, preventing extreme situations caused by equipment short circuit and other problems, and stimulating to the maximum stimulation time under this duty cycle Finish.

[0023] like Figure 3 As shown in the duty cycle diagram For stimulation current The strength of is the high level time, is the low level time, is the cycle length.

[0024] Specifically, in step S1, the duty cycle is limited in the following manner to prevent the duty cycle from exceeding a preset range, protect the internal circuit, and avoid system instability caused by an excessively large or small duty cycle: S11: Duty cycle saturation is modeled as follows: ; S12: Introduce the adjustment coefficient into the expression of step S21 ,expression becomes: ; S13: Setting the adjustment coefficient to 5 and Pan get: ; S14: Set the translation amount is 0.5, and the saturation function is obtained: .

[0025] like Figure 2 As shown, a device for dynamically adjusting the intensity of stimulation includes a load unit 1, the load unit 1 is connected to a constant current control unit 2 and a voltage detection unit 3, and the constant current control unit 2 is connected to a power input unit 4. The constant current control unit 2 is used as a constant current power supply output control circuit to control the output intensity of the stimulation current, and the voltage detection unit 3 is used as a self-checking circuit to synchronously detect the voltage at the end of the cycle. The load unit 1 determines whether the load resistance is less than the threshold resistance.

[0026] In addition, the power input unit 4 has a built-in BOOST circuit 41 , which inputs low-voltage direct current and outputs high-voltage direct current.

[0027] Meanwhile, the constant current control unit 2 has a built-in PWM switch control circuit 21. The PWM switch control circuit 21 is used to input a PWM switch control signal.

[0028] It can be seen that the voltage detection unit 3 has a built-in detection circuit 31 , and the voltage detection unit 3 cooperates with the load unit 1 to output voltage data that can be easily read by a conventional ADC.

[0029] Obviously, the constant current control unit 2 uses a grounding method for signal return.

[0030] Embodiment 1 In this embodiment, the total stimulation time t is set to 30 minutes, the initial duty cycle is D1=5%, D2=6%, Dmin=1%, Dmax=10%, k=1, and the intensity of the stimulation current I is set according to the actual feeling of the user. This is the most commonly used parameter group, which can be used by most users without special needs. The adjustment is relatively gentle and usually does not cause harm to the patient.

[0031] Embodiment 2 In this embodiment, the total stimulation time t is set to 30 minutes, the initial duty cycle is D1=10%, D2=11%, Dmin=1%, Dmax=40%, k=1.02, and the intensity of the stimulation current I is set according to the actual feeling of the user. This set of parameters is suitable for users with poor stimulation effects. By increasing the maximum duty cycle and the control speed, a better stimulation duty cycle can be found more quickly within the specified time to improve the stimulation effect.

[0032] Embodiment 3 In this embodiment, the total stimulation time t is set to 30 minutes, the initial duty cycle is D1=3%, D2=2%, Dmin=1%, Dmax=5%, k=0.98, and the intensity of the stimulation current I is set according to the actual feeling of the user. This set of parameters is suitable for users who are more sensitive to stimulation. The smaller the duty cycle, the weaker the stimulation to the user. At the same time, the user's sensitivity to stimulation changes is reduced by a slower control speed, reducing the user's stimulation pain.

[0033] To summarize, the principle of this embodiment is to set the duty cycle of the initial two cycles, output the stimulation current and detect the voltage at the end of the cycle, obtain the load resistance through the voltage and current, provide a recursive formula to obtain the duty cycle of the next cycle, dynamically adjust the duty cycle through detection and calculation, and determine whether the load resistance is less than the threshold resistance, and stop in time to ensure the safety of the equipment.

[0034] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0035] Although the terms such as load unit 1, constant current control unit 2, PWM switch control circuit 21, voltage detection unit 3, detection circuit 31, power input unit 4, BOOST circuit 41 are used more frequently in this article, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A method for dynamically adjusting stimulation intensity, characterized in that: The steps include: S1: Set circuit parameters; S2: The device outputs the control circuit output intensity through the constant current power supply. The stimulation current can be detected synchronously by the self-detection circuit in the device at the end of this cycle. ,according to and The load resistance can be calculated , the calculation formula is as follows: ； S3: Calculate the duty cycle of the next cycle using the recursive formula: ； , are the maximum duty cycle and the minimum duty cycle respectively. ,but ;when When ; is the control coefficient, The larger it is, the faster the regulation speed is; S4: Starting from the third cycle, the duty cycle of the stimulation waveform is adjusted to , and at the same time, detection and calculation are performed in each cycle to achieve dynamic adjustment of the duty cycle; S5: Judgment Is it less than the threshold resistance? If yes, it means the user's neural pathway is good, preventing extreme situations caused by equipment short circuit and other problems, and stimulating to the maximum stimulation time under this duty cycle Finish.

2. A method for dynamically adjusting stimulation intensity according to claim 1, characterized in that: In step S1, the duty cycle is limited in the following manner to determine , Values: S11: Duty cycle saturation is modeled as follows: ； S12: Introduce the adjustment coefficient into the expression of step S11 ,expression becomes: 。 3. A device for dynamic adjustment of stimulation intensity, adopting a method for dynamic adjustment of stimulation intensity according to any one of claims 1 to 2, characterized in that: It comprises a load unit (1), wherein the load unit (1) is connected to a constant current control unit (2) and a voltage detection unit (3), and the constant current control unit (2) is connected to a power input unit (4).

4. A device for dynamically adjusting stimulation intensity according to claim 3, characterized in that: The power input unit (4) has a built-in BOOST circuit (41).

5. A device for dynamically adjusting stimulation intensity according to claim 3, characterized in that: The constant current control unit (2) has a built-in PWM switch control circuit (21).

6. A device for dynamically adjusting stimulation intensity according to claim 3, characterized in that: The voltage detection unit (3) has a built-in detection circuit (31).

7. A device for dynamically adjusting stimulation intensity according to claim 3, characterized in that: The constant current control unit (2) is grounded.

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