Point stimulation therapeutic instrument
By using a common-mode filter and precision rectifier circuit in the point stimulation therapy device, combined with an operational amplifier and a ferrite core transformer, the problems of long customization cycle, high cost and poor detection effect of current acquisition transformer are solved, thereby achieving cost reduction, improved detection sensitivity and enhanced treatment intensity.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGZHOU HONGYANG MEDICAL TECH CO LTD
- Filing Date
- 2025-02-06
- Publication Date
- 2026-06-26
AI Technical Summary
The current acquisition transformers of existing point stimulation therapy devices have long customization cycles, high costs, large size and poor versatility. The diode rectifier circuit has poor detection effect at low speeds or when the skin is dry, and is prone to false alarms of human disconnection.
A common-mode filter and a precision rectifier circuit are used to replace the current acquisition transformer, and an operational amplifier is used to amplify the signal. Combined with a ferrite core transformer and high-voltage output, the detection sensitivity and the accuracy of electrode detachment judgment are improved.
It reduces costs and size, improves detection sensitivity and accuracy in judging electrode detachment, and enhances treatment intensity and skin penetration.
Smart Images
Figure CN224404186U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of therapeutic instruments, and in particular to a point stimulation therapeutic instrument. Background Technology
[0002] Chinese patent application number CN201320441329.2 discloses an adsorption-type point stimulation low-frequency therapeutic device. Its pulse output section uses a current acquisition transformer. The current acquisition transformer usually needs to be custom-made and then manufactured by the manufacturer according to the designed number of turns and iron core size. This process is time-consuming, bulky, costly, and has poor versatility. In addition, the current acquisition section uses a common diode rectifier circuit. Because diodes have voltage drops, when the output is set to a low level or when the human skin is dry, the feedback signal will be weak, making it easy to fail to detect the human body. The instrument will falsely report that the human body has disconnected and stop outputting, resulting in poor detection effect. Utility Model Content
[0003] This application provides a point stimulation therapy device to solve at least one problem existing in the related technology. The technical solution is as follows:
[0004] In a first aspect, embodiments of this application provide a point stimulation therapy device, comprising:
[0005] Common-mode filter, used to connect electrodes;
[0006] The operational amplifier rectifier circuit is connected to the common-mode filter;
[0007] The processing module includes a processing unit and a pulse output unit. The processing unit is connected to the pulse output unit and the operational amplifier rectifier circuit. The pulse output unit is connected to the common-mode filter.
[0008] The power supply module is connected to the processing unit and the pulse output unit.
[0009] In one embodiment, the operational amplifier rectifier circuit includes a precision rectifier circuit and an operational amplifier unit, wherein the precision rectifier circuit is connected to the common-mode filter and the operational amplifier unit, and the operational amplifier unit is connected to the processing unit.
[0010] In one embodiment, the precision rectifier circuit includes a first diode, a second diode, a first capacitor, and a first operational amplifier; the anode of the first diode is connected to the inverting input terminal of the first operational amplifier and the common-mode filter, the cathode of the first diode is connected to the output terminal of the first operational amplifier and the anode of the second diode, the non-inverting input terminal of the first operational amplifier is grounded, the cathode of the second diode is connected to the operational amplifier unit, and the first capacitor is connected in parallel with the first diode.
[0011] In one embodiment, the precision rectifier circuit further includes a first resistor, a second resistor, a third resistor, and a fourth resistor; the non-inverting input terminal of the first operational amplifier is grounded through the first resistor, one end of the second resistor is grounded, the other end of the second resistor is connected to one end of the third resistor and the common-mode filter, the other end of the third resistor is connected to the positive terminal of the first diode and one end of the fourth resistor, and the other end of the fourth resistor is connected to the negative terminal of the second diode.
[0012] In one embodiment, the operational amplifier unit includes a fifth resistor, a second operational amplifier, and a sixth resistor; one end of the fifth resistor is connected to the negative terminal of the second diode, the other end of the fifth resistor is connected to the non-inverting input terminal of the second operational amplifier, the inverting input terminal of the second operational amplifier is grounded, and the output terminal of the second operational amplifier is connected to the processing unit through the sixth resistor.
[0013] In one embodiment, the operational amplifier unit further includes a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a second capacitor, and a third capacitor; one end of the seventh resistor is connected to the negative terminal of the second diode and one end of the fifth resistor, the other end of the seventh resistor is grounded and connected to one end of the second capacitor, one end of the eighth resistor, and one end of the ninth resistor, the other end of the fifth resistor is connected to the other end of the second capacitor, the other end of the eighth resistor, and the non-inverting input terminal of the second operational amplifier, the other end of the ninth resistor is connected to the inverting input terminal of the operational amplifier unit and one end of the tenth resistor, and the other end of the tenth resistor is connected to the output terminal of the second operational amplifier.
[0014] In one embodiment, the pulse output unit includes an output transformer, a first Darlington transistor, and a second Darlington transistor; the first Darlington transistor and the second Darlington transistor are both connected to the processing unit and the output transformer, and the output transformer is connected to the common-mode filter.
[0015] In one embodiment, the pulse output unit further includes a power transistor connected to the processing unit and the output transformer.
[0016] In one embodiment, the pulse output unit further includes a relay connected to the power module and the power transistor.
[0017] In one embodiment, the power module includes a transformer chip connected to the input power supply and the relay.
[0018] The beneficial effects of the above technical solution include at least the following:
[0019] By setting up common-mode filter connection electrodes, the operational amplifier rectifier circuit is connected to the common-mode filter. The processing module includes a processing unit and a pulse output unit. The processing unit is connected to the pulse output unit and the operational amplifier rectifier circuit. The pulse output unit is connected to the common-mode filter. The power supply module is connected to the processing unit and the pulse output unit. Utilizing the common-mode filter output, it has strong versatility, does not require customization, and helps reduce costs. Current acquisition through the operational amplifier rectifier circuit with operational amplifier function helps improve detection sensitivity and detection effect.
[0020] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of this application will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description
[0021] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.
[0022] Figure 1 This is a block diagram of a point stimulation therapy device according to an embodiment of this application;
[0023] Figure 2 This is a schematic diagram of the operational amplifier rectifier circuit in an embodiment of this application. Detailed Implementation
[0024] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.
[0025] The terms "first," "second," "third," etc., used in the specification, claims, and accompanying drawings of this application are only used to distinguish different objects and not to describe a particular order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. References to "embodiment" herein mean that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0026] The present invention will be further explained and described below with reference to the accompanying drawings and specific embodiments.
[0027] Reference Figure 1 This application provides a point stimulation therapy device, including a common-mode filter, an operational amplifier rectifier circuit, a processing module (including a processing unit and a pulse output unit), a power supply module, electrodes for point stimulation, and an operation module (not shown, but could be buttons or a screen). The common-mode filter is connected to the electrodes, the operational amplifier rectifier circuit is connected to the common-mode filter, the processing unit is connected to the pulse output unit and the operational amplifier rectifier circuit, the pulse output unit is connected to the common-mode filter, the power supply module is connected to the processing unit and the pulse output unit, and the operation module is connected to the processing unit.
[0028] Reference Figure 1 In this embodiment, the power module includes an input power supply and a transformer chip. The input power supply can be an external power supply or a battery, used to provide 24V power. The transformer chip can include one or more, used to boost the 24V supply to 40V and step it down to 3.3V. Optionally, the transformer chip for boosting the 24V to 40V can be the XL6019 series; other models can be selected based on actual needs.
[0029] In this embodiment of the application, the processing unit may be composed of any one or more processor chips, including MCU microcontroller, FPGA, CPLD, DSP, ARM, etc. For example, this application uses MCU microcontroller.
[0030] Reference Figure 1 In this embodiment, the pulse output unit includes an output transformer, a first Darlington transistor, a second Darlington transistor, a power transistor, and a relay. Optionally, the power transistor is connected to the processing unit and the output transformer, the relay is connected to the power supply module and the power transistor, and the transformer chip is connected to the input power supply and the relay. Both the first and second Darlington transistors are connected to the processing unit and the output transformer, and the output transformer is connected to a common-mode filter.
[0031] Reference Figure 1 In this embodiment of the application, the operational amplifier rectifier circuit includes a precision rectifier circuit and an operational amplifier unit. The precision rectifier circuit is connected to a common-mode filter and the operational amplifier unit, and the operational amplifier unit is connected to a processing unit.
[0032] Reference Figure 2 Optionally, the precision rectifier circuit includes a first diode D1, a second diode D2, a first capacitor C1, a first operational amplifier U3A, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4. The anode of the first diode D1 is connected to the inverting input terminal of the first operational amplifier U3A and the common-mode filter (corresponding to pin IFB1). The cathode of the first diode D1 is connected to the output terminal of the first operational amplifier U3A and the anode of the second diode D2. The non-inverting input terminal of the first operational amplifier U3A is grounded to GND. The cathode of the second diode D2 is connected to the operational amplifier unit. The first capacitor C1 is connected in parallel with the first diode D1. The non-inverting input terminal of the first operational amplifier U3A is grounded through the first resistor R1. One end of the second resistor R2 is grounded. The other end of the second resistor R2 is connected to one end of the third resistor R3 and the common-mode filter. The other end of the third resistor R3 is connected to the anode of the first diode D1 and one end of the fourth resistor R4. The other end of the fourth resistor R4 is connected to the cathode of the second diode D2.
[0033] Reference Figure 2 Optionally, the operational amplifier unit includes a fifth resistor R5, a second operational amplifier U3B, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a second capacitor C2, a third capacitor C3, and a third diode D3; one end of the fifth resistor R5 is connected to the negative terminal of the second diode D2, and the other end of the fifth resistor R5 is connected to the non-inverting input terminal of the second operational amplifier U3B. The inverting input terminal of the second operational amplifier U3B is grounded. The output terminal of the second operational amplifier U3B is connected to the processing unit (corresponding connection pin is FBK1) and the positive terminal of the third diode D3 through the sixth resistor R6. The negative terminal of the third diode D3 is connected to the power supply module. Among them, one end of the seventh resistor R7 is connected to the negative terminal of the second diode D2 and one end of the fifth resistor R5. The other end of the seventh resistor R7 is grounded and connected to one end of the second capacitor C2, one end of the eighth resistor R8 and one end of the ninth resistor R9. The other end of the fifth resistor R5 is connected to the other end of the second capacitor C2, the other end of the eighth resistor R8 and the non-inverting input terminal of the second operational amplifier U3B. The other end of the ninth resistor R9 is connected to the inverting input terminal of the operational amplifier unit and one end of the tenth resistor R10. The other end of the tenth resistor R10 is connected to the output terminal of the second operational amplifier U3B.
[0034] In this embodiment, a precision rectifier circuit consisting of a first operational amplifier U3A, a first diode D1, and a second diode D2 is used. A common-mode filter of UU9.8 / 20mH is used instead of the existing current acquisition transformer. The current signal output from the common-mode filter is input to the precision rectifier circuit, then isolated and amplified by the second operational amplifier U3B, and output to the processing unit, thereby realizing the current acquisition of the electrode.
[0035] In this embodiment, the output transformer uses a ferrite core transformer instead of the existing silicon steel sheet transformer. The user can switch the point stimulation therapy device to adsorption mode through screen operation. At this time, the PWM channel A pin and PWM channel B pin of the processing unit output pulse A and pulse B respectively through the first Darlington transistor and the second Darlington transistor. The pulse width changes from 150us in the original normal mode to 50us. The conduction time of the first Darlington transistor and the second Darlington transistor also becomes extremely short (50us). At the same time, the processing unit controls the relay to switch the state, so that it changes from 24V to 40V. The 40V output by the transformer chip is used as the main power supply to power the power transistor. The power transistor is amplitude-adjusted by the processing unit. The voltage output of the power transistor after intensity adjustment based on the change of the main power supply is sent to the middle terminal of the output transformer. Pin 1 of the output transformer is connected to pin 1 of the primary coil of the common mode filter. Pin 2 of the output transformer and pin 2 of the primary coil of the common mode filter are connected to the electrode used for point stimulation. The common-mode filter's secondary winding collects current signals, which are then rectified by the operational amplifier rectifier circuit to obtain a unipolar signal. This signal is then sent to the processing unit for acquisition. The processing unit collects this current signal and displays it on the screen, allowing users to visually see the treatment intensity information received by the human body. It also determines whether the electrode has accidentally fallen off. If the electrode has accidentally fallen off, the processing unit immediately stops the output to prevent excessively strong output from continuing and causing burns if it comes into contact with the human skin again.
[0036] Optionally, the first operational amplifier U3A and the second operational amplifier U3B can be of model LM2904A-SR, the output transformer can be of model EE25 series, and the relay can be of model HK4100F.
[0037] The point stimulation therapy device of this application embodiment:
[0038] 1. By using a highly versatile common-mode filter to replace the current acquisition transformer, the cost is reduced to 1 / 10 of the original, and the size and weight are reduced to 1 / 3 of the original. Furthermore, production does not require a customization cycle, making it more widely applicable.
[0039] 2. By introducing an operational amplifier rectifier circuit that includes a precision rectifier circuit and an operational amplifier unit, the voltage drop of the corresponding diode is effectively reduced by tens of thousands of times due to the amplification factor of the second operational amplifier U3B in the operational amplifier unit. This does not attenuate the feedback signal, resulting in high current detection sensitivity. It can reliably detect whether the human electrode has fallen off at 15% of the full range. This overcomes the shortcomings of existing diode rectifier circuits, which have voltage drops. When the setting is low or the human skin is dry, the feedback signal weakens, and the diode will significantly attenuate the feedback signal, making it easy to fail to detect the human body. The instrument will then falsely report that the human body has disconnected and stop outputting.
[0040] 3. Replacing silicon steel sheet transformers with ferrite core transformers reduces heat generation and overcomes the disadvantages of silicon steel sheet transformers, which are only suitable for low-frequency operation, have low pulse signal frequency in adsorption-type point stimulation, but very narrow pulse peaks (especially in adsorption mode), and have a high equivalent operating frequency, which will cause large losses in silicon steel sheet transformers.
[0041] 4. In adsorption mode, the power supply operating voltage will be increased to 40V, which can output a higher intensity pulse signal, enhancing the therapeutic sensation and skin penetration. This overcomes the shortcomings of the existing two modes, which use the same voltage output. Because the adsorption mode has a small pulse width, the intensity of the same voltage output will be significantly lower than that of the normal mode, resulting in a weaker therapeutic sensation for the patient.
[0042] The above is a detailed description of the preferred embodiments of the present utility model. However, the present utility model is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present utility model. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.
Claims
1. A point stimulation therapy device, characterized by, include: Common-mode filter, used to connect electrodes; The operational amplifier rectifier circuit is connected to the common-mode filter; The processing module includes a processing unit and a pulse output unit. The processing unit is connected to the pulse output unit and the operational amplifier rectifier circuit. The pulse output unit is connected to the common-mode filter. The power supply module is connected to the processing unit and the pulse output unit.
2. The point stimulation therapeutic apparatus according to claim 1, characterized by: The operational amplifier rectifier circuit includes a precision rectifier circuit and an operational amplifier unit. The precision rectifier circuit is connected to the common-mode filter and the operational amplifier unit, and the operational amplifier unit is connected to the processing unit.
3. The point stimulation therapeutic apparatus according to claim 2, characterized by: The precision rectifier circuit includes a first diode, a second diode, a first capacitor, and a first operational amplifier; the anode of the first diode is connected to the inverting input terminal of the first operational amplifier and the common-mode filter, the cathode of the first diode is connected to the output terminal of the first operational amplifier and the anode of the second diode, the non-inverting input terminal of the first operational amplifier is grounded, the cathode of the second diode is connected to the operational amplifier unit, and the first capacitor is connected in parallel with the first diode.
4. The point stimulation therapy device according to claim 3, characterized in that: The precision rectifier circuit further includes a first resistor, a second resistor, a third resistor, and a fourth resistor; the non-inverting input terminal of the first operational amplifier is grounded through the first resistor, one end of the second resistor is grounded, the other end of the second resistor is connected to one end of the third resistor and the common-mode filter, the other end of the third resistor is connected to the positive terminal of the first diode and one end of the fourth resistor, and the other end of the fourth resistor is connected to the negative terminal of the second diode.
5. The point stimulation therapy device according to claim 3, characterized in that: The operational amplifier unit includes a fifth resistor, a second operational amplifier, and a sixth resistor; one end of the fifth resistor is connected to the negative terminal of the second diode, the other end of the fifth resistor is connected to the non-inverting input terminal of the second operational amplifier, the inverting input terminal of the second operational amplifier is grounded, and the output terminal of the second operational amplifier is connected to the processing unit through the sixth resistor.
6. The point stimulation therapy device according to claim 5, characterized in that: The operational amplifier unit further includes a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a second capacitor, and a third capacitor; one end of the seventh resistor is connected to the negative terminal of the second diode and one end of the fifth resistor, the other end of the seventh resistor is grounded and connected to one end of the second capacitor, one end of the eighth resistor, and one end of the ninth resistor, the other end of the fifth resistor is connected to the other end of the second capacitor, the other end of the eighth resistor, and the non-inverting input terminal of the second operational amplifier, the other end of the ninth resistor is connected to the inverting input terminal of the operational amplifier unit and one end of the tenth resistor, and the other end of the tenth resistor is connected to the output terminal of the second operational amplifier.
7. The point stimulation therapy device according to any one of claims 2-6, characterized in that: The pulse output unit includes an output transformer, a first Darlington transistor, and a second Darlington transistor; the first Darlington transistor and the second Darlington transistor are both connected to the processing unit and the output transformer, and the output transformer is connected to the common-mode filter.
8. The point stimulation therapy device according to claim 7, characterized in that: The pulse output unit also includes a power transistor, which is connected to the processing unit and the output transformer.
9. The point stimulation therapy device according to claim 8, characterized in that: The pulse output unit also includes a relay, which is connected to the power module and the power transistor.
10. The point stimulation therapy device according to claim 9, characterized in that: The power module includes a transformer chip, which is connected to the input power supply and the relay.