Auxiliary expectoration device for cardiothoracic surgery nursing

Abstract

The invention belongs to the technical field of atomization treatment equipment, and particularly relates to an expectoration assisting device for cardiothoracic surgery nursing, which comprises an atomizer and a mask, the air outlet end of an air pump in the atomizer is connected with an air outlet pipe joint, and the other end of the air outlet pipe joint is fixed on the outer wall of one side of the atomizer in a penetrating manner; the mask is connected with the air outlet pipe connector through a hose and a medicine cup, a liquid medicine concentration collecting module is fixed to the bottom of the mask, an air flow collecting module is fixed in the air outlet pipe connector, a central processing unit is fixed in the atomizer, and an air flow adjusting mechanism is arranged on the air outlet pipe connector. The liquid medicine concentration collecting module, the air flow collecting module and the air flow adjusting mechanism are arranged, the inspiration amount of a patient during atomization and the air inlet amount of the atomizer can be dynamically detected, and real-time adjustment is conducted according to data detected in real time. Therefore, the problem of liquid medicine waste or insufficient inhalation can be effectively avoided, and the atomization treatment effect is improved.

Description

Technical Field

[0001] The invention relates to the technical field of atomization treatment equipment, and in particular to a sputum coughing auxiliary device used for cardiothoracic surgery nursing. Background Art

[0002] Respiratory tract infections are common both outside and inside hospitals, especially in weak infants and young children, the elderly, and patients with poor mobility after surgery. During the onset of respiratory tract infection, there are symptoms such as difficulty in coughing up sputum, chest tightness, airway obstruction, and fever. This is because the sputum is too thick and adheres to the bronchial wall, making it difficult to cough up sputum and difficult to expel sputum. Severe cases may be complicated by lung infection, which brings pain to patients, directly affects the recovery of the disease, and even threatens life.

[0003] At present, in the nursing of cardiothoracic surgery, the traditional cough-assisted nebulizer may not be able to dynamically adjust according to the actual inhalation volume of the patient and the air intake volume of the device. This may lead to two undesirable situations. On the one hand, it may cause waste of liquid medicine, and on the other hand, it may cause insufficient liquid medicine inhaled by the patient, thus affecting the effect of nebulizer treatment, and cannot meet the requirements of cardiothoracic surgery nursing for the efficiency and accuracy of cough-assisted nebulizer. Summary of the invention

[0004] Based on the technical problems existing in the prior art, the present invention proposes a coughing assistance device for cardiothoracic surgery nursing.

[0005] The present invention proposes a coughing auxiliary device for cardiothoracic surgery nursing, comprising a nebulizer and a mask, wherein the air outlet end of the air pump in the nebulizer is connected to an air outlet pipe joint, the other end of the air outlet pipe joint is penetrated and fixed on an outer wall of one side of the nebulizer, the mask is connected to the air outlet pipe joint through a hose and a medicine cup, a drug liquid concentration acquisition module is fixed to the bottom of the mask, an air flow acquisition module is fixed to the air outlet pipe joint, a central processing unit is fixed inside the nebulizer, and an air flow adjustment mechanism is arranged on the air outlet pipe joint; the drug liquid concentration acquisition module is used to detect the concentration of drug liquid mist in the mask in real time; the air flow acquisition module is used to detect the air intake volume in real time; the central processing unit is used to receive data detected by the drug liquid concentration acquisition module and the air flow acquisition module, and to process the received data through the central processing unit The data is comprehensively analyzed to generate an evaluation coefficient, which is compared with a preset reference threshold value of the evaluation coefficient to determine whether the patient's inhaled volume and the air intake of the nebulizer are within an appropriate range, and the working state of the air flow adjustment mechanism is controlled according to the comparison result to adjust the air intake volume; the medicine liquid is added into the medicine cup, and the medicine cup and the hose are assembled and connected to the mask and the air outlet pipe joint, then the patient puts the mask on his mouth, and then starts the nebulizer for atomization, through the cooperation between the medicine liquid concentration acquisition module, the air flow acquisition module and the air flow adjustment mechanism, the patient's inhaled volume during atomization and the air intake of the nebulizer can be dynamically detected, and then real-time adjustments can be made to avoid waste of medicine liquid or insufficient inhalation and improve the atomization effect.

[0006] Preferably, an air inlet pipe is provided at the bottom of the mask, one end of the medicine cup is sleeved on the air inlet pipe, the other end is sleeved on the wire, and the other end of the wire is sleeved on the air outlet end of the air outlet pipe joint; in this way, the mask, medicine cup and hose can be disassembled separately, which is convenient for subsequent replacement and disinfection.

[0007] Preferably, the top end of the medicine cup is an upper tube head, and the bottom end of the medicine cup is a lower tube head, and a one-way valve is fixed in the lower tube head; in this way, liquid medicine can be added to the medicine cup through the upper tube head, and the gas can pass through the liquid medicine after entering from the lower tube head, thereby forming a mist of liquid medicine flowing out from the upper tube head, and the one-way valve can prevent the liquid medicine from flowing back.

[0008] Preferably, a wiring port is provided at the bottom of the drug solution concentration collection module, in which a wire is plugged and connected, and the other end of the wire is electrically connected to the central processing unit; in this way, after atomization is completed, one end connector of the wire can be pulled out from the wiring port, thereby not hindering the separate disassembly of the mask.

[0009] Preferably, the air flow rate adjustment mechanism comprises a valve assembly, and the valve assembly is mounted on the air outlet pipe joint; thus, the air flow rate in the air outlet pipe joint can be adjusted in real time through the valve assembly.

[0010] Preferably, the valve assembly includes a ball valve, a transmission gear is fixedly sleeved on the valve stem of the ball valve, an electric push rod is fixed inside the atomizer, the output shaft of the electric push rod is fixedly connected to a transmission rack, and the transmission rack is meshed with the transmission gear; when the electric push rod receives the corresponding instruction from the central processor, the output shaft of the electric push rod is extended or shortened accordingly, and then it will synchronously drive the transmission rack to move, and then the transmission rack will mesh with the transmission gear to drive the valve stem to rotate, thereby adjusting the air flow in the outlet pipe joint.

[0011] Preferably, the output end of the central processing unit is electrically connected to the input end of the electric push rod, and the output end and input end of the drug solution concentration acquisition module and the output end and input end of the air flow acquisition module are electrically connected to the input end and output end of the central processing unit respectively.

[0012] Preferably, the evaluation coefficient needs to comprehensively consider the mist concentration and air intake volume to reflect the current atomization efficiency and the risk of liquid medicine waste. The calculation formula of the evaluation coefficient is:

[0013]

[0014] Where, C: real-time detected fog concentration (unit: mg / L); C max : preset maximum safety concentration threshold (to avoid over-saturation); Q: real-time detected intake volume (unit: L / min); Q max : The maximum air intake allowed by the equipment; α, β: weight coefficients (need to be calibrated through experiments, for example, α+β=1).

[0015] Logic explanation: When the fog concentration approaches the maximum value (C→C max ), the air intake volume should be reduced (Q↓) to avoid waste. When the air intake volume is too high (Q→Q max ), the flow rate needs to be reduced to match the current fog concentration.

[0016] Preferably, the calculation formula for dynamically adjusting the intake air volume is:

[0017] Q target =Q current ·(1-γ·K)

[0018] Among them, Q current : Current actual air intake volume; γ: Adjustment gain coefficient (needs to be optimized through PID control or fuzzy logic).

[0019] Security constraints:

[0020] Avoid over-adjustment that may result in insufficient inhalation for the patient:

[0021] Q target ≥Q

[0022] Where Qmin To ensure the minimum air intake to achieve therapeutic effect.

[0023] Preferably, the calculation formula for stably adjusting the intake air volume through the PID control algorithm is:

[0024]

[0025] Where, e(t) = K target -K actual (deviation between target evaluation coefficient and actual value); K p ,K i ,K d It needs to be adjusted through experiments.

[0026] Compared with the prior art, the present invention provides a coughing assisting device for cardiothoracic surgery nursing, which has the following beneficial effects:

[0027] 1. A cough assist device for cardiothoracic surgery nursing, which is equipped with a liquid medicine concentration collection module, an airflow collection module and an airflow adjustment mechanism. Through the cooperation of these modules and mechanisms, the patient's inhalation volume during atomization and the air intake volume of the nebulizer can be dynamically detected, and real-time adjustments can be made based on the real-time detection data. This can effectively avoid the problem of liquid medicine waste or insufficient inhalation, and improve the effect of atomization treatment.

[0028] 2. A coughing aid device for cardiothoracic surgery nursing, the mask, medicine cup and hose are designed to be individually detachable. One end of the medicine cup is sleeved on the air inlet pipe at the bottom of the mask, and the other end is sleeved on the outlet pipe joint through a wire, which is convenient for subsequent replacement and disinfection, helps to maintain the hygiene of the device and reduce the risk of cross infection.

[0029] 3. A cough assist device for cardiothoracic surgery nursing, the air flow adjustment mechanism uses a valve assembly (including a ball valve, a transmission gear, an electric push rod and a transmission rack). The central processor controls the operation of the electric push rod according to the evaluation coefficient, and drives the ball valve stem to rotate through the cooperation of the transmission gear and the transmission rack, so as to achieve real-time and accurate adjustment of the air flow in the outlet pipe joint.

[0030] 4. A coughing assist device used in cardiothoracic surgery care can scientifically evaluate the current atomization efficiency and the risk of drug waste by comprehensively calculating the evaluation coefficient of the mist concentration and the air intake volume, and adopting the air intake volume dynamic adjustment calculation formula and PID control algorithm, and stably adjust the air intake volume to ensure that the patient inhales an appropriate amount of drug solution. At the same time, it complies with safety constraints and avoids excessive adjustment that may lead to insufficient inhalation of the patient, thus better meeting the needs of cardiothoracic surgery care. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1This is a schematic diagram of a coughing assistance device for cardiothoracic surgery nursing proposed by the present invention;

[0032] Figure 2 This is a schematic diagram of the structure of a coughing assistance device for cardiothoracic surgery nursing proposed by the present invention from a first angle;

[0033] Figure 3 This is a second angle structural schematic diagram of a coughing assistance device for cardiothoracic surgery nursing proposed by the present invention;

[0034] Figure 4 This is a schematic diagram of the installation structure of a liquid concentration collection module of a sputum auxiliary device for cardiothoracic surgery nursing proposed by the present invention;

[0035] Figure 5 This is a schematic cross-sectional view of a coughing assistance device for cardiothoracic surgery nursing proposed by the present invention;

[0036] Figure 6 This is a schematic diagram of the disassembled structure of a coughing assistance device for cardiothoracic surgery nursing proposed by the present invention;

[0037] Figure 7 For the present invention Figure 6 A schematic diagram of the enlarged structure at point A;

[0038] Figure 8 This is a schematic diagram of the installation structure of the air flow rate adjustment mechanism of the expectoration auxiliary device for cardiothoracic surgery nursing proposed by the present invention;

[0039] Fig. 9 For the present invention Figure 8 A schematic diagram of the enlarged structure at B;

[0040] Fig.10 This is a schematic diagram of the structure of a medicine cup of a sputum coughing assistance device for cardiothoracic surgery nursing proposed by the present invention.

[0041] In the figure: 1. Nebulizer; 2. Mask; 3. Hose; 4. Medicine cup; 5. Drug concentration acquisition module; 6. Air outlet pipe joint; 7. Air flow acquisition module; 8. Central processing unit; 9. Ball valve; 10. Transmission gear; 11. Electric push rod; 12. Transmission rack; 13. Wire; 14. Air pump; 15. One-way valve; 16. Lower pipe head; 17. Upper pipe head; 18. Air inlet pipe. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0043] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0044] Reference Figure 1-Figure 10 A coughing assisting device for cardiothoracic surgery nursing comprises a nebulizer 1 and a mask 2. The air outlet end of the air pump 14 in the nebulizer 1 is connected to an air outlet pipe joint 6. The other end of the air outlet pipe joint 6 penetrates and is fixed on one side outer wall of the nebulizer 1. The mask 2 is connected to the air outlet pipe joint 6 through a hose 3 and a medicine cup 4. A liquid medicine concentration collection module 5 is fixed to the bottom of the mask 2. An air flow collection module 7 is fixed in the air outlet pipe joint 6. A central processing unit 8 is fixed inside the nebulizer 1. An air flow adjustment mechanism is provided on the air outlet pipe joint 6. The liquid medicine concentration collection module 5 is fixed to the bottom of the mask 2. An air flow collection module 7 is fixed in the air outlet pipe joint 6. A central processing unit 8 is fixed inside the nebulizer 1. An air flow adjustment mechanism is provided on the air outlet pipe joint 6. 5, used for real-time detection of the concentration of the liquid medicine mist in the mask; the airflow collection module 7, used for real-time detection of the intake volume; the central processing unit 8 is used for receiving the data detected by the liquid medicine concentration collection module 5 and the airflow collection module 7, and performing a comprehensive analysis on the received data through the central processing unit to generate an evaluation coefficient, and comparing the evaluation coefficient with a preset evaluation coefficient reference threshold to determine whether the patient's inhaled volume and the intake volume of the nebulizer 1 are within a suitable range, and controlling the working state of the airflow adjustment mechanism according to the comparison result to adjust the intake volume;

[0045] It should be noted that the liquid medicine concentration acquisition module 5 may be a humidity / fog concentration sensor or other equipment capable of detecting the concentration of liquid medicine fog in the mask in real time. The liquid medicine concentration acquisition module 5 is not specifically limited here and may be selected according to actual needs;

[0046] The air flow collection module 7 may be a gas flow sensor or other equipment capable of detecting the intake air volume in real time. The air flow collection module 7 is not specifically limited here and may be selected according to actual needs;

[0047] When in use, add the medicine liquid into the medicine cup 4, and assemble the medicine cup 4 and the hose 3 to connect to the mask 2 and the air outlet pipe joint 6. Then the patient puts the mask 2 on the mouth, and then starts the nebulizer 1 for atomization. Through the cooperation between the medicine liquid concentration collection module 5, the air flow collection module 7 and the air flow adjustment mechanism, the patient's inhalation volume during atomization and the air intake volume of the nebulizer can be dynamically detected, and then real-time adjustments can be made to avoid waste of medicine liquid or insufficient inhalation and improve the atomization effect.

[0048] The bottom of the mask 2 is provided with an air inlet pipe 18, one end of the medicine cup 4 is sleeved on the air inlet pipe 18, and the other end is sleeved on the wire 13, and the other end of the wire 13 is sleeved on the outlet end of the outlet pipe joint 6;

[0049] When in use, the mask 2, medicine cup 4 and hose 3 can be disassembled separately, which is convenient for subsequent replacement and disinfection.

[0050] The top of the medicine cup 4 is an upper tube head 17, and the bottom of the medicine cup 4 is a lower tube head 16. A one-way valve 15 is fixed in the lower tube head 16.

[0051] When in use, liquid medicine can be added into the medicine cup 4 through the upper tube head 17, and the gas can pass through the liquid medicine after entering from the lower tube head 16, thereby forming liquid medicine mist flowing out from the upper tube head 17, and the one-way valve 15 can prevent the liquid medicine from flowing back.

[0052] Furthermore, a wiring port is provided at the bottom of the drug solution concentration acquisition module 5, and a wire 13 is plugged in and connected to the wiring port, and the other end of the wire 13 is electrically connected to the central processor 8;

[0053] When in use, after atomization is completed, one end connector of the wire 13 can be pulled out from the wiring port, thereby not hindering the separate disassembly of the mask 2.

[0054] Wherein, the air flow adjustment mechanism includes a valve assembly, and the valve assembly is installed on the air outlet pipe joint 6;

[0055] When in use, the air flow in the air outlet pipe connector 6 can be adjusted in real time through the valve assembly.

[0056] The valve assembly includes a ball valve 9, a transmission gear 10 is fixedly sleeved on the valve stem of the ball valve 9, an electric push rod 11 is fixed inside the atomizer 1, and a transmission rack 12 is fixedly connected to the output shaft of the electric push rod 11, and the transmission rack 12 is meshed and connected with the transmission gear 10;

[0057] During use, when the electric push rod 11 receives the corresponding instruction from the central processor 8, the output shaft of the electric push rod 11 will extend or shorten accordingly, and then it will synchronously drive the transmission rack 12 to move, and then the transmission rack 12 will engage the transmission gear 10 to drive the valve stem to rotate, thereby adjusting the air flow in the outlet pipe connector 6.

[0058] Among them, the output end of the central processing unit 8 is electrically connected to the input end of the electric push rod 11, and the output end and input end of the liquid concentration acquisition module 5 and the output end and input end of the air flow acquisition module 7 are electrically connected to the input end and output end of the central processing unit 8 respectively.

[0059] In another embodiment, the evaluation coefficient needs to comprehensively consider the mist concentration and the air intake volume to reflect the current atomization efficiency and the risk of liquid medicine waste. The calculation formula of the evaluation coefficient is:

[0060]

[0061] Where, C: real-time detected fog concentration (unit: mg / L); C max : preset maximum safety concentration threshold (to avoid over-saturation); Q: real-time detected intake volume (unit: L / min); Q max : The maximum air intake allowed by the equipment; α, β: weight coefficients (need to be calibrated through experiments, for example, α+β=1).

[0062] It should be noted that dimensionless is a process of expressing physical quantities in dimensionless form. This method can eliminate the influence of units on physical problems, making the problems more concise and universal. The weight coefficient is to adapt to different working conditions and environmental changes more flexibly in actual monitoring. These deviation coefficients can be adjusted according to specific circumstances to improve the performance and applicability of the monitoring system.

[0063] Logic explanation: When the fog concentration approaches the maximum value (C→C max ), the air intake volume should be reduced (Q↓) to avoid waste. When the air intake volume is too high (Q→Q max ), the flow rate needs to be reduced to match the current fog concentration.

[0064] Furthermore, the dynamic adjustment calculation formula of the intake volume is:

[0065] Q target =Q current ·(1-γ·K)

[0066] Among them, Q current : Current actual air intake volume; γ: Adjustment gain coefficient (needs to be optimized through PID control or fuzzy logic).

[0067] Security constraints:

[0068] Avoid over-adjustment that may result in insufficient inhalation for the patient:

[0069] Q target ≥Q

[0070] Where Q min To ensure the minimum air intake to achieve therapeutic effect.

[0071] Furthermore, the calculation formula for stabilizing the intake air volume through the PID control algorithm is:

[0072]

[0073] Where, e(t) = K target -K actual (deviation between target evaluation coefficient and actual value); K p ,K i ,K d It needs to be adjusted through experiments.

[0074] The above formulas are all dimensionless and numerical calculations. The formula is a formula for the most recent real situation obtained by collecting a large amount of data and performing software simulation. The preset parameters in the formula are set by technicians in this field according to actual conditions.

[0075] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0076] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0077] In the several embodiments provided in the present application, it should be understood that the disclosed overall system, device and method can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another overall system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0078] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0079] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0080] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A cough assisting device for cardiothoracic surgery nursing, comprising a nebulizer (1) and a mask (2), characterized in that: The air outlet end of the air pump (14) in the nebulizer (1) is connected to an air outlet pipe joint (6), the other end of the air outlet pipe joint (6) penetrates and is fixed on one side outer wall of the nebulizer (1), the mask (2) is connected to the air outlet pipe joint (6) through a hose (3) and a medicine cup (4), a liquid medicine concentration collection module (5) is fixed at the bottom of the mask (2), an air flow collection module (7) is fixed in the air outlet pipe joint (6), a central processing unit (8) is fixed inside the nebulizer (1), and an air flow adjustment mechanism is arranged on the air outlet pipe joint (6); the liquid medicine concentration collection module (5), The invention is used for detecting the concentration of the liquid medicine mist in the mask in real time; the air flow acquisition module (7) is used for detecting the air intake volume in real time; the central processing unit (8) is used for receiving the data detected by the liquid medicine concentration acquisition module (5) and the air flow acquisition module (7), and performing a comprehensive analysis on the received data through the central processing unit to generate an evaluation coefficient, and comparing the evaluation coefficient with a preset evaluation coefficient reference threshold value to determine whether the patient's inhaled air volume and the air intake volume of the nebulizer (1) are within a suitable range, and controlling the working state of the air flow adjustment mechanism according to the comparison result to adjust the air intake volume.

2. The expectoration assisting device for cardiothoracic surgery nursing according to claim 1, characterized in that: An air inlet pipe (18) is provided at the bottom of the mask (2); one end of the medicine cup (4) is sleeved on the air inlet pipe (18) and the other end is sleeved on the wire (13); the other end of the wire (13) is sleeved on the air outlet end of the air outlet pipe joint (6).

3. The expectoration assisting device for cardiothoracic surgery nursing according to claim 2, characterized in that: The top end of the medicine cup (4) is an upper tube head (17), and the bottom end of the medicine cup (4) is a lower tube head (16). A one-way valve (15) is fixed inside the lower tube head (16).

4. The expectoration assisting device for cardiothoracic surgery nursing according to claim 1, characterized in that: The bottom of the drug solution concentration acquisition module (5) is provided with a wiring port, in which a wire (13) is plugged and connected, and the other end of the wire (13) is electrically connected to the central processing unit (8).

5. The expectoration assisting device for cardiothoracic surgery nursing according to claim 1, characterized in that: The air flow rate adjustment mechanism comprises a valve assembly, and the valve assembly is mounted on the air outlet pipe joint (6).

6. The expectoration assisting device for cardiothoracic surgery nursing according to claim 5, characterized in that: The valve assembly comprises a ball valve (9), a transmission gear (10) is fixedly sleeved on the valve stem of the ball valve (9), an electric push rod (11) is fixed inside the atomizer (1), an output shaft of the electric push rod (11) is fixedly connected to a transmission rack (12), and the transmission rack (12) is meshedly connected to the transmission gear (10).

7. The expectoration assisting device for cardiothoracic surgery nursing according to claim 6, characterized in that: The output end of the central processing unit (8) is electrically connected to the input end of the electric push rod (11), and the output end and input end of the liquid medicine concentration acquisition module (5) and the output end and input end of the gas flow acquisition module (7) are electrically connected to the input end and output end of the central processing unit (8) respectively.

8. The expectoration assisting device for cardiothoracic surgery nursing according to claim 6, characterized in that: The calculation formula of the evaluation coefficient is: Where, C: real-time detected fog concentration; C max : preset maximum safe concentration threshold; Q: real-time detected intake volume; Q max : The maximum air intake allowed by the equipment; α, β: weight coefficients.

9. The expectoration assisting device for cardiothoracic surgery nursing according to claim 8, characterized in that: The calculation formula for dynamic adjustment of the intake air volume is: Q target =Q current ·(1-γ·K) Among them, Q current : Current actual air intake volume; γ: Adjustment gain coefficient.

10. The expectoration assisting device for cardiothoracic surgery nursing according to claim 9, characterized in that: The calculation formula for stably adjusting the intake air volume through the PID control algorithm is: Where, e(t) = K target -K actual (deviation between target evaluation coefficient and actual value); K p ,K i ,K d It needs to be adjusted through experiments.

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