Method and device for dynamically adjusting stimulation intensity

Abstract

The present invention provides a method and device for dynamically adjusting stimulation intensity, addressing issues such as operational safety of electrical stimulation devices. The method sets the duty cycle for the first two cycles, outputs the stimulation current, and detects the voltage at the end of the cycle. The load resistance is calculated using the voltage and current, and a recursive formula is provided to calculate the duty cycle for the next cycle. The duty cycle is dynamically adjusted through detection and calculation, and a determination is made as to whether the load resistance is less than a threshold resistance, with timely stopping to ensure operational safety. The present invention offers advantages such as high operational safety and good stability.

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 electrostimulation devices stimulate tissue by generating a continuous electric current. The core of these devices lies in the safety and reliability of controlling voltage and current, and their corresponding usage procedures are programmed accordingly. The intensity of the stimulation is controlled by a current regulator, which adjusts the total stimulation energy received by the user, typically varying the voltage / resistance to achieve the desired current output. However, in actual use, if existing electrostimulation devices experience abnormal conditions such as short circuits, they can easily lead to excessive stimulation intensity and cause damage.

[0003] To address the shortcomings of existing technologies, researchers have conducted extensive research and proposed various solutions. For example, a Chinese patent document discloses an autonomic nerve electrical stimulator [202210896475.8], which uses a controller to output a voltage control signal to control the first voltage conversion module to convert the power supply signal input from the power supply input terminal into a voltage signal of corresponding intensity, which is then output 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, thereby outputting low-frequency electrical pulses and achieving 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 equipment. Summary of the Invention

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

[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 problem.

[0007] To achieve the above-mentioned object, the present invention adopts the following technical solution: a method for dynamically adjusting stimulation intensity, comprising the following steps:

[0008] S1: Set circuit parameters;

[0009] S2: The device outputs the control circuit output intensity through the constant current power supply. The stimulation current can be detected by the self-test 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:

[0010] ;

[0011] S3: Calculate the duty cycle of the next cycle using the recursive formula:

[0012] ;

[0013] 、 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;

[0014] 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;

[0015] S5: Judgment Is it less than the threshold resistance? If so, it means that the user's neural pathway is good, preventing extreme situations such as equipment short circuits, and stimulating to the maximum stimulation time under this duty cycle. Finish.

[0016] 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 、 Value:

[0017] S11: Duty cycle saturation is modeled as follows:

[0018] ;

[0019] S12: Introduce the adjustment coefficient into the expression of step S21 ,expression becomes:

[0020] .

[0021] A device for dynamically adjusting stimulation intensity comprises a load unit, wherein the load unit is connected to a constant current control unit and a voltage detection unit, and the constant current control unit is connected to a power input unit.

[0022] In the above-mentioned device for dynamically adjusting stimulation intensity, the power input unit has a built-in BOOST circuit.

[0023] In the above-mentioned device for dynamically adjusting stimulation intensity, the constant current control unit has a built-in PWM switch control circuit.

[0024] In the above-mentioned device for dynamically adjusting stimulation intensity, the voltage detection unit has a built-in detection circuit.

[0025] In the above-mentioned device for dynamically adjusting stimulation intensity, the constant current control unit is grounded.

[0026] 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 equipment 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

[0027] Figure 1 It is a schematic diagram of the method of the present invention.

[0028] Figure 2 It is a schematic diagram of the device principle of the present invention.

[0029] Figure 3 Schematic diagram of the duty cycle of the present invention.

[0030] Figure 4 It is a structural diagram of the present invention.

[0031] 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

[0032] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] like Figure 1 As shown, a method for dynamically adjusting stimulation intensity includes the following steps:

[0034] S1: Set circuit parameters, including setting stimulation current , total stimulation duration , the duty cycle of the initial two cycles 、 , which is calculated as follows:

[0035] ;

[0036] Since the tissue is constantly changing, the same duty cycle is used to stimulate two cycles and measure the 、 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;

[0037] S2: If Figure 4 As shown, the device outputs the output intensity of the control circuit through the constant current power supply. The stimulation current can be detected by the self-test 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:

[0038] ;

[0039] S3: Calculate the duty cycle of the next cycle using the recursive formula:

[0040] ;

[0041] 、 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;

[0042] 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%.

[0043] 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;

[0044] S5: Judgment Is it less than the threshold resistance? If so, it means that the user's neural pathway is good, preventing extreme situations such as equipment short circuits, and stimulating to the maximum stimulation time under this duty cycle. Finish.

[0045] like Figure 3 As shown in the duty cycle diagram Stimulating current The intensity of is the high level time, is the low level time, is the cycle length.

[0046] Specifically, in step S1, the duty cycle is limited in the following manner to prevent the duty cycle from exceeding a preset range, thereby protecting the internal circuit and avoiding system instability caused by an excessively large or small duty cycle:

[0047] S11: Duty cycle saturation is modeled as follows:

[0048] ;

[0049] S12: Introduce the adjustment coefficient into the expression of step S21 ,expression becomes:

[0050] ;

[0051] S13: Set the adjustment coefficient to 5 and Pan get:

[0052] ;

[0053] S14: Set the translation amount is 0.5, and the saturation function is obtained:

[0054] .

[0055] like Figure 2 As shown, a device for dynamically adjusting stimulation intensity includes a load unit 1, which is connected to a constant current control unit 2 and a voltage detection unit 3. The constant current control unit 2 is connected to a power input unit 4. The constant current control unit 2 serves as a constant current power output control circuit, used to control the output intensity of the stimulation current. The voltage detection unit 3 serves as a self-test circuit to synchronously detect the voltage at the end of the cycle. The load unit 1 determines whether the load resistance is less than a threshold resistance.

[0056] In addition, the power input unit 4 has a built-in BOOST circuit 41 , which inputs low-voltage DC power and outputs high-voltage DC power.

[0057] 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.

[0058] 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.

[0059] Obviously, the constant current control unit 2 adopts a grounding method for signal return.

[0060] Example 1

[0061] In this example, the total stimulation duration t is set to 30 minutes, the initial duty cycle is D1 = 5%, D2 = 6%, Dmin = 1%, Dmax = 10%, and k = 1. The stimulation current I intensity is set based on the user's actual experience. This is the most commonly used parameter set and is suitable for most users without special needs. The adjustment is relatively gentle and generally does not cause harm to the patient.

[0062] Example 2

[0063] In this example, the total stimulation duration t is set to 30 minutes, the initial duty cycle is D1 = 10%, D2 = 11%, Dmin = 1%, Dmax = 40%, k = 1.02, and the stimulation current I intensity is set based on the user's actual experience. This set of parameters is suitable for users who experience poor stimulation effects. By increasing the maximum duty cycle and the control speed, a more optimal stimulation duty cycle can be found more quickly within the specified time, thereby improving the stimulation effect.

[0064] Example 3

[0065] In this example, the total stimulation duration t is set to 30 minutes, the initial duty cycle is D1 = 3%, D2 = 2%, Dmin = 1%, Dmax = 5%, k = 0.98, and the stimulation current I intensity is set based on the user's actual experience. This set of parameters is suitable for users who are more sensitive to stimulation. A smaller duty cycle will weaken the user's stimulation sensation. At the same time, a slower control speed will reduce the user's sensitivity to stimulation changes and alleviate the user's stimulation pain.

[0066] 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.

[0067] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

[0068] Although this document frequently uses 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, and boost circuit 41, the use of other terms is not excluded. These terms are used solely to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

Claims

1. A device for dynamically adjusting stimulation intensity, characterized in that: The device 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); the device for dynamically adjusting the stimulation intensity adopts the following adjustment method: 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 by the self-test 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; S4: Starting from the third cycle, the duty cycle of the stimulation waveform is adjusted to ,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 so, it means that the user's neural pathway is good, preventing extreme situations such as equipment short circuits, and stimulating to the maximum stimulation time under this duty cycle. Finish.

2. A device for dynamic adjustment of stimulation intensity according to claim 1, characterized in that: In step S1, the duty cycle is limited in the following way to determine 、 Value: 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 dynamically adjusting stimulation intensity according to claim 1, characterized in that: The power input unit (4) has a built-in BOOST circuit (41).

4. The device for dynamic adjustment of stimulation intensity according to claim 1, characterized in that: The constant current control unit (2) has a built-in PWM switch control circuit (21).

5. The device for dynamic adjustment of stimulation intensity according to claim 1, characterized in that: The voltage detection unit (3) has a built-in detection circuit (31).

6. The device for dynamic adjustment of stimulation intensity according to claim 1, characterized in that: The constant current control unit (2) is grounded.

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