Airflow feedback type respiratory training system

Abstract

The invention relates to the technical field of medical rehabilitation equipment, in particular to an airflow feedback type respiratory training system which comprises a respiratory phase recognition triggering unit and a sub-target point electrical stimulation execution unit. The trigger unit is composed of a 3D printing airflow interface module, a micro differential pressure type airflow sensor group, a dual-band radio frequency signal transmitting circuit module and a power supply sub unit with low-voltage protection, and can detect breathing airflow, distinguish breathing phases and transmit exclusive radio frequency signals. And the execution unit is provided with a double-path single-pole double-throw radio frequency receiving relay, a composite structure body surface electrode group and a sub-parameter electrotherapy control host, and can switch a stimulation loop and output matched electrical stimulation to realize accurate synchronization of respiratory training and human body physiological rhythm. Through the combined action of all the parts, accurate undisturbed detection of phase recognition can be achieved, collaborative adaptation of a stimulation signal and a physiological mechanism is guaranteed, and meanwhile intelligent synchronous regulation and control of logic control are achieved.

Description

Technical Field

[0001] This invention relates to the field of medical rehabilitation equipment technology, and in particular to an airflow feedback breathing training system. Background Technology

[0002] The core of rehabilitation for patients with respiratory dysfunction lies in strengthening respiratory muscles and improving respiratory rhythm coordination through scientific training. Current clinical and home-use respiratory training devices have several shortcomings: Low phase recognition accuracy: Most devices use single-channel airflow detection or chest impedance sensing technology, which cannot effectively isolate the interference between inspiratory and expiratory airflows, easily leading to phase misjudgment and causing training movements to be out of sync with the patient's natural breathing rhythm; Poor stimulation synergy: Existing electrical stimulation training devices mostly target only the diaphragm muscle group, ignoring the auxiliary contraction of abdominal muscles during the expiratory phase, violating the physiological breathing pattern of "diaphragm dominating during inhalation and abdominal muscles participating during exhalation," resulting in low training efficiency; Lagging control logic: Although some devices have electrical stimulation functions, the electrical signal output is controlled by a manual switch or fixed cycle, unable to dynamically adjust according to the patient's real-time respiratory status, leading to poor patient compliance; Insufficient parameter adaptability: Stimulation parameters are mostly uniform preset modes, unable to be individually adjusted according to the patient's muscle strength level and tolerance differences, and the connection between the electrodes and the main unit is susceptible to electromagnetic interference, affecting stimulation stability.

[0003] While previous technical documents mentioned low-frequency electrotherapy devices, although containing basic structures such as relays and dual-electrode components, lacked a closed-loop control design that precisely synchronized with the respiratory phase. This prevented them from achieving the synergistic training effect of "inhalation stimulating the phrenic nerve and exhalation stimulating the abdominal muscles," necessitating structural optimization and logic upgrades to address these issues. Therefore, to better solve these problems, this invention proposes an airflow feedback-based respiratory training system. Summary of the Invention

[0004] To address the above issues, this invention proposes an airflow feedback-based breathing training system, comprising a breathing phase recognition triggering unit and a target-point electrical stimulation execution unit. This invention enables precise and non-intrusive phase recognition, ensuring coordinated adaptation between stimulation signals and physiological mechanisms, while simultaneously achieving intelligent synchronous regulation of logical control.

[0005] An airflow feedback breathing training system includes a breathing phase recognition triggering unit and a target point electrical stimulation execution unit;

[0006] The respiratory phase recognition trigger unit includes a 3D-printed airflow interface module, a miniature differential pressure airflow sensor group, a dual-band radio frequency signal transmission circuit module, and a power supply unit with low-voltage protection. The 3D-printed airflow interface module is used for detecting inhalation and exhalation airflow. The miniature differential pressure airflow sensor group is used to distinguish between inhalation and exhalation phases in real time. The dual-band radio frequency signal transmission circuit module is used to transmit a dedicated frequency signal when the corresponding phase airflow is detected. The power supply unit with low-voltage protection is used to power the trigger unit.

[0007] The sub-target point electrical stimulation execution unit includes a dual-channel single-pole double-throw radio frequency receiving relay, a composite structure surface electrode group, and a sub-parameter electrotherapy control host; the dual-channel single-pole double-throw radio frequency receiving relay is used for interference-free switching of inspiratory and expiratory stimulation circuits; the composite structure surface electrode group is used for precise sub-target point stimulation; and the sub-parameter electrotherapy control host is used for outputting electrical stimulation with matching parameters for the currently active circuit.

[0008] Furthermore, the 3D printing airflow interface module is provided with independent airflow hole one and independent airflow hole two. The walls of independent airflow hole one and independent airflow hole two are embedded with sealing silicone rings. Independent airflow hole one is connected to the inhalation branch of the breathing tube, and independent airflow hole two is connected to the exhalation branch of the breathing tube.

[0009] Furthermore, the miniature differential pressure airflow sensor group includes sensor one and sensor two. Sensor one corresponds to the independent airflow port one, and sensor two corresponds to the independent airflow port two. Sensor one only responds to the inspiratory branch airflow, and sensor two only responds to the expiratory branch airflow.

[0010] Furthermore, the dual-band radio frequency signal transmitting circuit module includes an inhalation-triggered radio frequency unit and an exhalation-triggered radio frequency unit. The inhalation-triggered radio frequency unit is electrically connected to sensor one, and the exhalation-triggered radio frequency unit is electrically connected to sensor two.

[0011] Furthermore, the dual-channel single-pole double-throw radio frequency receiving relay is matched with the inspiratory trigger radio frequency unit and the expiratory trigger radio frequency unit respectively, and independently turns on the corresponding electrode circuit when receiving signals of different frequency bands;

[0012] Furthermore, the sub-parameter electrotherapy control host includes a single-chip microcomputer control module and a constant current output module, and pre-stores differentiated stimulation parameters: diaphragm stimulation parameters are 2-15mA, abdominal muscle stimulation parameters are 8-20mA, and the diaphragm stimulation parameters and the abdominal muscle stimulation parameters can be stored independently and support manual adjustment.

[0013] Furthermore, the composite structure body surface electrode group includes a phrenic nerve electrode and an abdominal muscle electrode. Both the phrenic nerve electrode and the abdominal muscle electrode adopt a composite structure of a conductive gel layer and a silver foil layer. The phrenic nerve electrode is attached to the upper chest region of the human body, and the abdominal muscle electrode is attached to the abdominal region of the human body.

[0014] Furthermore, it also includes a shielded dual-core electrical connection wire, through which the electrotherapy control host and the body surface electrode group are connected.

[0015] Compared with the prior art, the significant advantages of this invention are:

[0016] (1) Accurate and interference-free phase recognition: This invention achieves complete isolation of inhalation and exhalation airflow from the hardware structure through the one-to-one correspondence design of "dual independent through holes + dual sensors". Combined with dual-band exclusive trigger signals, it solves the core problem of phase misjudgment in existing devices and improves the accuracy of phase recognition.

[0017] (2) Stimulation synergistic fit with physiological mechanism: Based on respiratory phase, the diaphragm nerve and abdominal muscle are stimulated in a synergistic manner. During inhalation, the diaphragm contracts to enhance lung ventilation, and during exhalation, the abdominal muscle contracts to assist in the emptying of gas from the lungs. This fully follows the muscle movement law of human physiological breathing. Compared with a single diaphragm stimulation device, the efficiency of patients' forced vital capacity is improved.

[0018] (3) Intelligent synchronization of control logic: The closed-loop control of "airflow detection-signal triggering-loop switching" is adopted. No manual operation by the patient is required. The device can automatically follow the patient's breathing rhythm to dynamically adjust the stimulation target, which significantly improves the patient's training compliance. It is especially suitable for patients with weak muscle strength or poor cognitive function.

[0019] (4) Parameter adjustment is flexible and stable: The sub-parameter electrotherapy control host supports independent adjustment of diaphragm and abdominal muscle parameters to adapt to individual differences of different patients; the shielded connecting wires and constant current output module work together to ensure stable transmission of electrical stimulation signals, with stimulation intensity fluctuations ≤ ±1mA, thus improving training safety. Attached Figure Description

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0021] Figure 1 This is a main block diagram of an airflow feedback breathing training system according to the present invention;

[0022] Figure 2 This is a flowchart of the operation of an airflow feedback breathing training system according to the present invention.

[0023] Specific embodiments

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0025] An airflow feedback breathing training system includes a breathing phase recognition triggering unit and a target point electrical stimulation execution unit;

[0026] The respiratory phase recognition trigger unit includes a 3D-printed airflow interface module, a miniature differential pressure airflow sensor group, a dual-band radio frequency signal transmission circuit module, and a power supply unit with low-voltage protection. The 3D-printed airflow interface module is used for detecting inhalation and exhalation airflow. The miniature differential pressure airflow sensor group is used to distinguish between inhalation and exhalation phases in real time. The dual-band radio frequency signal transmission circuit module is used to transmit a dedicated frequency signal when the corresponding phase airflow is detected. The power supply unit with low-voltage protection is used to power the trigger unit.

[0027] The sub-target point electrical stimulation execution unit includes a dual-channel single-pole double-throw radio frequency receiving relay, a composite structure surface electrode group, and a sub-parameter electrotherapy control host; the dual-channel single-pole double-throw radio frequency receiving relay is used for interference-free switching of inspiratory and expiratory stimulation circuits; the composite structure surface electrode group is used for precise sub-target point stimulation; and the sub-parameter electrotherapy control host is used for outputting electrical stimulation with matching parameters for the currently active circuit.

[0028] In specific embodiments, such as Figure 1 As shown, the present invention discloses an airflow feedback respiratory training system, comprising a respiratory phase recognition triggering unit and a target-point electrical stimulation execution unit; the respiratory phase recognition triggering unit includes a 3D-printed airflow interface module, a miniature differential pressure airflow sensor group, a dual-band radio frequency signal transmission circuit module, and an electronic power supply unit with low-voltage protection; the target-point electrical stimulation execution unit includes a dual-channel single-pole double-throw radio frequency receiving relay, a composite structure body electrode group, and a parameter-based electrotherapy control host.

[0029] Furthermore, the 3D printing airflow interface module is provided with independent airflow hole one and independent airflow hole two. The walls of independent airflow hole one and independent airflow hole two are embedded with sealing silicone rings. Independent airflow hole one is connected to the inhalation branch of the breathing tube, and independent airflow hole two is connected to the exhalation branch of the breathing tube.

[0030] In a specific embodiment, the 3D-printed airflow interface module serves as the physical carrier for airflow detection. It employs an integrated 3D printing molding process and features two independent airflow channels, namely, independent airflow port one and independent airflow port two. Each port wall is embedded with a medical-grade sealing silicone ring to ensure a leak-free airflow path. Independent airflow port one connects to the inspiratory branch of the patient's breathing tubing and is used only for collecting inspiratory airflow. Independent airflow port two connects to the expiratory branch and is used only for collecting expiratory airflow. This structurally achieves complete isolation between inspiratory and expiratory airflows, laying the foundation for accurate phase recognition.

[0031] Furthermore, the miniature differential pressure airflow sensor group includes sensor one and sensor two. Sensor one corresponds to the independent airflow port one, and sensor two corresponds to the independent airflow port two. Sensor one only responds to the inspiratory branch airflow, and sensor two only responds to the expiratory branch airflow.

[0032] In a specific embodiment, the miniature differential pressure airflow sensor group consists of sensor one and sensor two, which are assembled one-to-one with the two independent through holes of the 3D printed airflow interface module. That is, sensor one is embedded in independent airflow through hole one, and sensor two is embedded in independent airflow through hole two. The sensor adopts the differential pressure detection principle and has a sensitivity of 0.5L / min. When the airflow passes through the corresponding through hole, the sensor converts the change in airflow pressure difference into an electrical signal output. Sensor one only responds to the forward airflow of the inspiratory branch, and sensor two only responds to the reverse airflow of the expiratory branch, thus eliminating phase signal cross-interference.

[0033] Furthermore, the dual-band radio frequency signal transmitting circuit module includes an inhalation-triggered radio frequency unit and an exhalation-triggered radio frequency unit. The inhalation-triggered radio frequency unit is electrically connected to sensor one, and the exhalation-triggered radio frequency unit is electrically connected to sensor two.

[0034] Furthermore, the dual-channel single-pole double-throw radio frequency receiving relay is matched with the inspiratory trigger radio frequency unit and the expiratory trigger radio frequency unit respectively, and independently turns on the corresponding electrode circuit when receiving signals of different frequency bands;

[0035] In a specific embodiment, the dual-band radio frequency signal transmission circuit module includes two independent signal transmission modules: an inspiratory trigger radio frequency unit and an expiratory trigger radio frequency unit, which are electrically connected to sensor one and sensor two respectively via wires. When sensor one outputs an inspiratory electrical signal, it triggers the inspiratory trigger radio frequency unit to transmit a radio frequency signal in a specific frequency band. When sensor two outputs an expiratory electrical signal, it triggers the expiratory trigger radio frequency unit to transmit a radio frequency signal in another dedicated frequency band. The dual-band design enables the specific differentiation between inspiratory and expiratory trigger commands.

[0036] In a specific embodiment, the dual-channel single-pole double-throw radio frequency receiving relay serves as the core component for loop switching. Its signal receiving end can simultaneously match two frequency bands of the dual-band radio frequency signal transmitting circuit module. Internally, it has two independent loops connected to the phrenic nerve electrode and the abdominal muscle electrode, respectively. The relay is in the off state by default. When it receives the 433MHz signal from the inspiratory trigger radio frequency unit, it only conducts the loop where the phrenic nerve electrode is located. When it receives the 315MHz signal from the expiratory trigger radio frequency unit, it only conducts the loop where the abdominal muscle electrode is located, thus achieving interference-free and rapid switching between the two stimulation loops with a response time ≤10ms, ensuring the synchronization of stimulation and respiratory phase.

[0037] In a specific embodiment, the power supply unit with low-voltage protection uses a 3.7V lithium battery as the core power supply, along with a charging management chip and a low-voltage protection circuit, to provide a stable DC power supply for all components of the breathing phase recognition trigger unit. When the battery voltage is lower than 3.2V, the low-voltage protection circuit automatically cuts off the power supply to prevent signal distortion or hardware damage caused by undervoltage operation.

[0038] Furthermore, the composite structure body surface electrode group includes a phrenic nerve electrode and an abdominal muscle electrode. Both the phrenic nerve electrode and the abdominal muscle electrode adopt a composite structure of a conductive gel layer and a silver foil layer. The phrenic nerve electrode is attached to the upper chest region of the human body, and the abdominal muscle electrode is attached to the abdominal region of the human body.

[0039] In a specific embodiment, the composite structure surface electrode assembly includes two independent dual-electrode components: a phrenic nerve electrode and an abdominal muscle electrode. Each electrode assembly adopts a three-layer composite structure of "conductive gel layer + silver foil conductive layer + medical non-woven fabric substrate". The conductive gel layer is a medical-grade hydrogel, which has good skin adhesion and no risk of allergies. The silver foil conductive layer ensures low-loss transmission of electrical signals, and the overall contact resistance of the electrode is ≤50Ω. There are two pairs of four electrode patches for stimulating the phrenic nerve and the abdominal muscles. The electrode patches for stimulating the phrenic nerve include large patches and small patches. The large patches are applied to the second intercostal space along the midclavicular line in the upper chest, and the small patches are applied to the junction of the middle and lower 1 / 3 of the outer edge of the sternocleidomastoid muscle, with one pair of electrode patches on each side. The electrode patches for stimulating the abdominal muscles are applied to the origin and insertion points of the left and right internal and external oblique muscles, or the origin and insertion points of the rectus abdominis muscles on both sides, with one pair of electrode patches on each side.

[0040] Furthermore, the sub-parameter electrotherapy control host includes a single-chip microcomputer control module and a constant current output module, and pre-stores differentiated stimulation parameters: diaphragm stimulation parameters are 2-15mA, abdominal muscle stimulation parameters are 8-20mA, and the diaphragm stimulation parameters and the abdominal muscle stimulation parameters can be stored independently and support manual adjustment.

[0041] In a specific embodiment, the sub-parameter electrotherapy control host serves as the core for controlling the electrical stimulation parameters. It integrates a microcontroller control module and a constant current output module, and is electrically connected to a dual-channel single-pole double-throw radio frequency receiving relay via wires. The host pre-stores differentiated stimulation parameters for the diaphragm and abdominal muscles, with the diaphragm stimulation parameter set to 2-15mA and the abdominal muscle stimulation parameter to 8-20mA. These parameter settings are tailored to the physiological characteristics of the two muscles. The host panel has a parameter adjustment knob, allowing the stimulation parameters for the diaphragm and abdominal muscles to be stored and adjusted independently, meeting the individualized needs of different patients. After parameter settings are completed, the host remains in a continuous power supply standby state. The output of the electrical signal is entirely controlled by the on / off state of the relay circuit, ensuring precise matching of stimulation timing with respiratory phase.

[0042] Furthermore, it also includes a shielded dual-core electrical connection wire, through which the electrotherapy control host and the body surface electrode group are connected;

[0043] In a specific embodiment, a shielded dual-core electrical connection wire serves as the connection carrier between the subparameter electrotherapy control host and the composite structure surface electrode group. It adopts a dual-core design, with the core made of tin-plated copper to reduce transmission loss. The outer layer is wrapped with an aluminum foil shielding layer, which can effectively isolate external electromagnetic interference. The wire length is 2-3m to meet the needs of patients with slight movements during training and avoid electrode detachment or limited movement due to the wire being too short.

[0044] like Figure 2 As shown, the working principle of this invention is as follows:

[0045] 1. Equipment Initialization and Preparation: Medical staff seal and connect the independent airflow port one of the 3D-printed airflow interface module to the inspiratory branch of the breathing mask, and connect the independent airflow port two to the expiratory branch; attach the large patch of the phrenic nerve electrode to the second intercostal space along the midclavicular line of the upper chest of the patient, and attach the small patch to the junction of the middle and lower 1 / 3 of the outer edge of the sternocleidomastoid muscle, with one pair of electrode patches on each side; the electrode patches for stimulating the abdominal muscles are attached to the origin and insertion points of the left and right internal and external oblique muscles, or the origin and insertion points of the rectus abdominis muscles on both sides, with one pair of electrode patches on each side, and connect the electrodes to the sub-parameter electrotherapy control host through a shielded double-core electrical connection wire; according to the patient's muscle strength assessment results, set the stimulation parameters through the knob on the host panel, and after the parameters are set, the host buzzer indicates "ready".

[0046] 2. Identification and stimulation triggering of the inspiratory phase: When the patient begins to inhale, the airflow enters through the independent airflow port 1. The sensor 1 detects the change in airflow pressure difference and converts it into a DC signal. After the RC filter circuit filters out the noise generated by the airflow disturbance, it is transmitted to the dual-band radio frequency signal transmission circuit module. After the module identifies the inspiratory electrical signal, it triggers the inspiratory trigger radio frequency unit to transmit a 433MHz radio frequency signal with a unique identification code.

[0047] 3. Conduction and execution of the inspiratory stimulation circuit: After receiving the 433MHz signal, the dual-channel single-pole double-throw radio frequency receiving relay verifies the identification code through the built-in decoding module. Once confirmed, it immediately activates the circuit where the phrenic nerve electrode is located. The multi-parameter electrotherapy control host receives the circuit signal due to the relay activation. The microcontroller control module instructs the constant current output module to output the electrical stimulation signal according to the preset parameters. The signal is transmitted to the phrenic nerve electrode through the wire, stimulating the phrenic nerve and causing diaphragmatic muscle contraction, thereby enhancing the patient's inspiratory depth and vital capacity.

[0048] 4. Expiratory phase recognition and stimulation triggering: When the patient begins to exhale, the airflow is discharged from the independent airflow port 2. Sensor 2 detects the change in reverse airflow pressure difference and outputs an expiratory electrical signal to the module. The module triggers the expiratory trigger radio frequency unit to transmit a 315MHz radio frequency signal with a unique identification code.

[0049] 5. Conduction and execution of the expiratory stimulation circuit: After receiving the 315MHz signal and verifying the identification code, the relay quickly cuts off the phrenic nerve electrode circuit and simultaneously activates the circuit where the abdominal muscle electrode is located; the electrotherapy control host switches the output parameters and outputs electrical stimulation signals according to the preset parameters of the abdominal muscles. The abdominal muscle electrodes stimulate the contraction of the abdominal muscles, assisting the lungs in expelling residual gas and reducing expiratory resistance.

[0050] 6. Cyclic Training and Safety Protection: The system cycles through the above inspiratory-expiratory stimulation process in accordance with the patient's respiratory rhythm, and the entire process requires no manual intervention. When the lithium battery voltage of the power supply unit is lower than 3.2V, the low-voltage protection circuit cuts off the power supply, and the LED indicator on the main unit turns red to indicate charging. After training, turn off the main unit power, remove the electrodes and airflow interface module, and disinfect the electrodes for the next use.

[0051] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0052] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.

[0053] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. An airflow feedback breathing training system, characterized in that, Includes a respiratory phase recognition triggering unit and a target-point electrical stimulation execution unit; The respiratory phase recognition trigger unit includes a 3D-printed airflow interface module, a miniature differential pressure airflow sensor group, a dual-band radio frequency signal transmission circuit module, and a power supply unit with low-voltage protection. The 3D-printed airflow interface module is used for detecting inhalation and exhalation airflow. The miniature differential pressure airflow sensor group is used to distinguish between inhalation and exhalation phases in real time. The dual-band radio frequency signal transmission circuit module is used to transmit a dedicated frequency signal when the corresponding phase airflow is detected. The power supply unit with low-voltage protection is used to power the trigger unit. The sub-target point electrical stimulation execution unit includes a dual-channel single-pole double-throw radio frequency receiving relay, a composite structure surface electrode group, and a sub-parameter electrotherapy control host; the dual-channel single-pole double-throw radio frequency receiving relay is used for interference-free switching of inspiratory and expiratory stimulation circuits; the composite structure surface electrode group is used for precise sub-target point stimulation; and the sub-parameter electrotherapy control host is used for outputting electrical stimulation with matching parameters for the currently active circuit.

2. The airflow feedback breathing training system according to claim 1, characterized in that, The 3D printing airflow interface module is provided with independent airflow hole one and independent airflow hole two. The walls of independent airflow hole one and independent airflow hole two are embedded with sealing silicone rings. Independent airflow hole one is connected to the inhalation branch of the breathing tube, and independent airflow hole two is connected to the exhalation branch of the breathing tube.

3. The airflow feedback breathing training system according to claim 1, characterized in that, The miniature differential pressure airflow sensor group includes sensor one and sensor two. Sensor one corresponds to independent airflow port one, and sensor two corresponds to independent airflow port two. Sensor one only responds to the inspiratory branch airflow, and sensor two only responds to the expiratory branch airflow.

4. The airflow feedback breathing training system according to claim 3, characterized in that, The dual-band radio frequency signal transmitting circuit module includes an inhalation-triggered radio frequency unit and an exhalation-triggered radio frequency unit. The inhalation-triggered radio frequency unit is electrically connected to sensor one, and the exhalation-triggered radio frequency unit is electrically connected to sensor two.

5. The airflow feedback breathing training system according to claim 4, characterized in that, The dual-channel single-pole double-throw radio frequency receiving relay is matched with the inspiratory trigger radio frequency unit and the expiratory trigger radio frequency unit respectively, and independently turns on the corresponding electrode circuit when receiving signals of different frequency bands.

6. The airflow feedback breathing training system according to claim 1, characterized in that, The sub-parameter electrotherapy control host includes a microcontroller control module and a constant current output module, and pre-stores differentiated stimulation parameters: diaphragm stimulation parameters are 2-15mA, abdominal muscle stimulation parameters are 8-20mA, and the diaphragm stimulation parameters and the abdominal muscle stimulation parameters can be stored independently and support manual adjustment.

7. The airflow feedback breathing training system according to claim 1, characterized in that, The composite structure body surface electrode group includes a phrenic nerve electrode and an abdominal muscle electrode. Both the phrenic nerve electrode and the abdominal muscle electrode adopt a composite structure of a conductive gel layer and a silver foil layer. The phrenic nerve electrode is attached to the upper chest region of the human body, and the abdominal muscle electrode is attached to the abdominal region of the human body.

8. The airflow feedback breathing training system according to claim 1, characterized in that, It also includes a shielded dual-core electrical connection wire, through which the electrotherapy control host and the body surface electrode group are connected.

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