Electrical stimulation waveform generation circuit and electrical stimulation device

Abstract

The utility model relates to the technical field of medical instruments, in particular to an electrical stimulation waveform generating circuit and an electrical stimulation device.The electrical stimulation waveform generating circuit is located between a controller and an electrode assembly in the electrical stimulation device and comprises a constant voltage source, an adjustable constant current source, a first electronic switch, a second electronic switch, a third electronic switch and a capacitor; wherein the first end of the first electronic switch, the constant voltage source and the first end of the third electronic switch are connected in sequence, the second end of the first electronic switch is connected with the first end of the capacitor and the first end of the second electronic switch, and the second end of the second electronic switch is connected with the adjustable constant current source. The second end of the capacitor and the second end of the third electronic switch are connected with the electrode assembly of the output end. The circuit is high in safety, low in energy consumption and exquisite in structure.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, and in particular to an electric stimulation waveform generating circuit and an electric stimulation device. Background Art

[0002] In neuroscience, researchers have discovered that electrical stimulation can stimulate neuronal activity, thereby controlling and regulating nervous system function. Therefore, electrical stimulation holds broad promise for treating neurological diseases and disorders, such as Parkinson's disease, depression, and epilepsy. However, because the responses of biological tissues and neurons to electrical stimulation are highly complex, specific electrical stimulation waveforms are required to achieve optimal therapeutic effects. However, existing circuits for generating electrical stimulation waveforms typically incorporate transformers, which consume high energy and are bulky.

[0003] Therefore, there is an urgent need for an electrical stimulation waveform generating circuit with low energy consumption and small size. Utility Model Content

[0004] (1) Technical issues to be resolved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides an electrical stimulation waveform generating circuit and an electrical stimulation device.

[0006] (2) Technical solution

[0007] In order to achieve the above-mentioned purpose, the main technical solutions adopted by this utility model include:

[0008] In a first aspect, an embodiment of the present invention provides an electrical stimulation waveform generating circuit, which is located between the controller 2 and the electrode assembly 3 in the electrical stimulation device and includes a constant voltage source 14, an adjustable constant current source 16, a first electronic switch 11, a second electronic switch 12, a third electronic switch 13, and a capacitor 15;

[0009] The first end of the first electronic switch 11, the constant voltage source 14, and the first end of the third electronic switch 13 are connected in sequence. The second end of the first electronic switch 11 is connected to the first end of the capacitor 15 and the first end of the second electronic switch 12 respectively. The second end of the second electronic switch 12 is connected to the adjustable constant current source 16. The second end of the capacitor 15 and the second end of the third electronic switch 13 are connected to the electrode assembly 3 of the output end 17.

[0010] When the first electronic switch 11 is disconnected and the second electronic switch 12 and the third electronic switch 13 are closed, an electrical stimulation positive pulse is generated to charge the capacitor 15; when the first electronic switch 11 and the third electronic switch 13 are closed and the second electronic switch 12 is disconnected, the capacitor 15 is discharged to generate an electrical stimulation negative pulse.

[0011] Optionally, the charge amount of the generated electrical stimulation negative pulse is equal to the charge amount of the electrical stimulation positive pulse.

[0012] Optionally, the adjustable constant current source 16 is a voltage-controlled current source or a mirror current source.

[0013] Optionally, the constant voltage source 14 is a fixed output voltage source or a programmable voltage source.

[0014] Optionally, the first electronic switch 11 is a triode, a MOS tube or an analog switch;

[0015] The second electronic switch 12 is a triode, a MOS tube or an analog switch;

[0016] The third electronic switch 13 is a triode, a MOS transistor or an analog switch.

[0017] Optionally, the capacitor 15 is a metal foil capacitor, a polyester film capacitor or a polypropylene film capacitor.

[0018] In a second aspect, an embodiment of the present invention provides an electrical stimulation device, comprising the electrical stimulation waveform generating circuit 1 described in any one of the first aspects, as well as a controller 2 and an electrode assembly 3;

[0019] The electrical stimulation waveform generating circuit 1 is connected to the controller 2 and the electrode assembly 3 respectively.

[0020] Optionally, the electrode assembly 3 includes at least two electrode sheets, and the electrode sheets use conductive glue as the conductive medium.

[0021] (3) Beneficial effects

[0022] The utility model discloses an electrical stimulation waveform generating circuit and an electrical stimulation device. Since the adjustable constant current source adopts a voltage-controlled current source or a mirror current source, it can provide a stable current output, ensuring the accuracy and controllability of the electrical stimulation. Since the constant voltage source adopts a fixed-output voltage source or a programmable voltage source, it ensures voltage stability. When a programmable voltage source is adopted, through programming control, when the pre-output electrical stimulation current is small, the voltage output by the control voltage source is reduced; when the pre-output electrical stimulation current is large, the voltage output by the control voltage source is increased. This helps to reduce the voltage drop on the electronic switch, thereby reducing energy consumption. Since a capacitor device is used in the electrical stimulation waveform generating circuit, the charge amount of the generated positive pulse and negative pulse can be equal, ensuring the stability and consistency of the electrical stimulation effect, thereby avoiding damage to human tissue. Compared with existing circuits, the electrical stimulation waveform generating circuit of the utility model can provide the same function while using fewer components and a simpler connection relationship, making the structure of the circuit more sophisticated, thereby reducing the energy consumption of the electrical stimulation device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of an electrical stimulation waveform generating circuit provided by an embodiment of the present invention;

[0024] Figure 2 This is a schematic structural diagram of an electrical stimulation device provided in another embodiment of the present invention.

[0025] [Description of Reference Numerals]

[0026] 1: Electrical stimulation waveform generation circuit;

[0027] 11: first electronic switch, 12: second electronic switch, 13: third electronic switch, 14: constant voltage source, 15: capacitor, 16: adjustable constant current source, 17: output terminal;

[0028] 2: Controller;

[0029] 3: Electrode assembly. DETAILED DESCRIPTION

[0030] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation methods in conjunction with the accompanying drawings.

[0031] To better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0032] The present invention provides an electrical stimulation waveform generating circuit and an electrical stimulation device. The electrical stimulation waveform generating circuit is located between the controller and the electrode assembly 3 in the electrical stimulation device and includes a constant voltage source 14, an adjustable constant current source 16, a first electronic switch 11, a second electronic switch 12, a third electronic switch 13, and a capacitor 15. The first end of the first electronic switch 11, the constant voltage source 14, and the first end of the third electronic switch 13 are connected in sequence. The second end of the first electronic switch 11 is connected to the first end of the capacitor 15 and the first end of the second electronic switch 12, respectively. The second end of the second electronic switch 12 is connected to the adjustable constant current source 16. The second end of the capacitor 15 and the second end of the third electronic switch 13 are connected to the output end 17 of the electrode assembly 3. This circuit has high safety, low energy consumption, and a compact structure.

[0033] Example 1

[0034] like Figure 1 and Figure 2As shown, this embodiment provides an electrical stimulation waveform generating circuit, which is located between the controller 2 and the electrode assembly 3 in the electrical stimulation device, and includes a constant voltage source 14, an adjustable constant current source 16, a first electronic switch 11, a second electronic switch 12, a third electronic switch 13 and a capacitor 15.

[0035] Among them, the first end of the first electronic switch 11, the constant voltage source 14, and the first end of the third electronic switch 13 are connected in sequence, the second end of the first electronic switch 11 is connected to the first end of the capacitor 15 and the first end of the second electronic switch 12 respectively, the second end of the second electronic switch 12 is connected to the adjustable constant current source 16, and the second end of the capacitor 15 and the second end of the third electronic switch 13 are connected to the electrode assembly 3 of the output end 17.

[0036] Optionally, the adjustable constant current source 16 is a voltage-controlled current source or a mirror current source, and the constant voltage source 14 is a fixed-output voltage source or a programmable voltage source.

[0037] When a programmable voltage source is used, the voltage of the voltage source can be increased or decreased according to the magnitude of the pre-output electrical stimulation current through programming control. The first electronic switch 11, the second electronic switch 12, and the third electronic switch 13 are not limited to triodes, MOS transistors, or analog switches. The capacitor 15 can be a metal foil capacitor, a polyester film capacitor, or a polypropylene film capacitor.

[0038] More preferably, in this embodiment, the first electronic switch 11, the second electronic switch 12 and the third electronic switch 13 are all MOS tubes, which have the advantages of high input impedance, low energy consumption, fast switching speed, and high reliability. Among them, the MOS tube has a fast switching speed and a short response time, which enables it to achieve high-frequency switching operations during the operation of the electrical stimulation device, providing a certain degree of safety for the patient's treatment process.

[0039] When the first electronic switch 11 is turned off and the second electronic switch 12 and the third electronic switch 13 are turned on, the electrical stimulation waveform generating circuit generates an electrical stimulation positive pulse to charge the capacitor 15;

[0040] When the first electronic switch 11 and the third electronic switch 13 are closed and the second electronic switch 12 is open, the capacitor 15 is discharged, and the electrical stimulation waveform generating circuit generates an electrical stimulation negative pulse.

[0041] In addition, in the initial state and when the electrical stimulation waveform stops intermittently, the first electronic switch 11, the second electronic switch 12 and the third electronic switch 13 are all in the off state, disconnecting the electrical connections of all active devices at the output end 17 to ensure the safety of the circuit and personnel.

[0042] Through the electrical stimulation waveform generating circuit provided in this embodiment, the duration of the positive pulse of the waveform is equal to the charging time of the capacitor, and the duration of the negative pulse of the waveform is equal to the discharging time of the capacitor. Although the charging time of the capacitor is not equal to the discharging time of the capacitor, the total amount of charge flowing into and out of the capacitor is the same. Because the capacitor is connected in series with the human body, the net charge flowing through the human body in the positive and negative directions of the electrical stimulation waveform is also 0, thereby avoiding damage to human tissue.

[0043] Example 2

[0044] like Figure 1 As shown, this embodiment provides an electrical stimulation device, comprising the electrical stimulation waveform generating circuit 1 described in any one of the first embodiments, as well as a controller 2 and an electrode assembly 3;

[0045] The electrical stimulation waveform generating circuit 1 is connected to the controller 2 and the electrode assembly 3 respectively.

[0046] Optionally, the electrode assembly 3 includes an electrode wire and at least two electrode sheets. The electrode sheets use conductive glue as a conductive medium to improve the contact quality between the electrode and the skin. The conductive glue is usually a gel-like substance that can fill the tiny gaps on the skin surface to ensure good electrical connection, and the electrode sheets are connected to the patient's chest or abdomen.

[0047] The controller 2 is an existing STM32 microcontroller or an MSP430 controller.

[0048] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0049] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0050] In the present invention, unless otherwise expressly specified or limited, when a first feature is “above” or “below” a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above,” “above,” or “above” a second feature, it may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is “below,” “below,” or “below” a second feature, it may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0051] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0052] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An electrical stimulation waveform generating circuit, located between a controller (2) and an electrode assembly (3) in an electrical stimulation device, characterized in that: It includes a constant voltage source (14), an adjustable constant current source (16), a first electronic switch (11), a second electronic switch (12), a third electronic switch (13) and a capacitor (15); The first end of the first electronic switch (11), the constant voltage source (14), and the first end of the third electronic switch (13) are connected in sequence; the second end of the first electronic switch (11) is connected to the first end of the capacitor (15) and the first end of the second electronic switch (12), respectively; the second end of the second electronic switch (12) is connected to the adjustable constant current source (16); and the second end of the capacitor (15) and the second end of the third electronic switch (13) are connected to the electrode assembly (3) of the output end (17).

2. The electrical stimulation waveform generating circuit according to claim 1, characterized in that: When the first electronic switch (11) is opened and the second electronic switch (12) and the third electronic switch (13) are closed, an electrical stimulation positive pulse is generated to charge the capacitor (15); When the first electronic switch (11) and the third electronic switch (13) are closed and the second electronic switch (12) is open, the capacitor (15) discharges to generate an electrical stimulation negative pulse.

3. The electrical stimulation waveform generating circuit according to claim 2, characterized in that: The charge amount of the generated negative electrical stimulation pulse is equal to the charge amount of the positive electrical stimulation pulse.

4. The electrical stimulation waveform generating circuit according to claim 1, wherein: The adjustable constant current source (16) is a voltage-controlled current source or a mirror current source.

5. The electrical stimulation waveform generating circuit according to claim 1, characterized in that: The constant voltage source (14) is a voltage source with a fixed output or a programmable voltage source.

6. The electrical stimulation waveform generating circuit according to claim 1, characterized in that: The first electronic switch (11) is a triode, a MOS tube or an analog switch; The second electronic switch (12) is a triode, a MOS tube or an analog switch; The third electronic switch (13) is a triode, a MOS tube or an analog switch.

7. The electrical stimulation waveform generating circuit according to claim 1, characterized in that: The capacitor (15) is a metal foil capacitor, a polyester film capacitor or a polypropylene film capacitor.

8. An electrical stimulation device, characterized in that: It comprises the electrical stimulation waveform generating circuit (1) according to any one of claims 1 to 7, as well as a controller (2) and an electrode assembly (3); The electrical stimulation waveform generating circuit (1) is connected to the controller (2) and the electrode assembly (3) respectively.

9. The electrical stimulation device according to claim 8, wherein The electrode assembly (3) comprises at least two electrode sheets, and the electrode sheets use conductive glue as a conductive medium.

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