Lung function detection method and detector for preventing tongue blockage and air leakage

Abstract

The invention discloses a lung function detection method and detector for preventing tongue blockage and air leakage. The method comprises the following steps: (1) recording an expiration curve of a subject; (2) recording an inspiration curve of the subject; (3) comparing the expiration curve with the tongue blockage curve, if the expiration curve is matched with the tongue blockage curve, entering step (5), and if the expiration curve is not matched with the tongue blockage curve, entering the next step; (4) comparing the expiration curve with the inspiration curve, detecting again if the conditions are met, and ending the detection if the conditions are not met; (5) prompting the examinee to use the tongue blockage prevention blowing nozzle; and the reversing valve switches the communication channel, so that the detection device and the tongue-blocking-preventing blowing nozzle are conducted, detection is conducted again, and then detection is finished. According to the lung function detection method provided by the invention, whether the mouthpiece is blocked by the tongue of the subject and air leakage occurs during expiration can be judged, and the subject can be prompted to replace the corresponding mouthpiece for preventing tongue blockage or perform detection again. Therefore, the subject can correctly perform the lung function detection action, and the repeated collection work in the lung function detection is reduced.

Description

Technical Field

[0001] The present invention relates to a lung function detection method for preventing tongue blockage and air leakage, and also relates to a corresponding lung function detector, belonging to the technical field of medical devices. Background Art

[0002] Lung function measurement is an objective detection method used to measure a person's expiratory volume and expiratory speed (flow rate). It is an essential method for diagnosing and monitoring chronic obstructive pulmonary disease (COPD), and is also important for asthma, idiopathic pulmonary fibrosis, and chronic cough. Lung function measurement also helps to evaluate the impact of certain systemic diseases on the respiratory system and helps to determine an individual's risk before surgery.

[0003] In the Chinese invention with the patent number ZL 202011021023.2, an improved lung function detector is disclosed. The lung function detector includes an upper trough cylinder and a lower trough cylinder that are symmetrically arranged up and down, as well as a handle upper cover, a handle lower cover, a middle trough cylinder, a circuit board, a button, and a display mask. By adding a fibrillation chamber and a microporous fibrillation device to physically filter the air vibration link, the accuracy of the detection result is improved. Similarly, the prior art mainly judges whether the subject correctly completes the detection action through the flow-volume curve. Practice has proved that the existing flow-volume curve is not sufficient to judge the incorrect actions of the tongue blocking the mouthpiece and the air flow not fully entering the lung function detector during exhalation.

[0004] However, in the existing lung function measurement methods, a curve with two or more peaks is uniformly qualitatively determined to be caused by uneven force. No further subdivision is made. According to the inventor's long-term observation, in actual operations in hospitals, this will lead to the lack of pertinence in the guidance of the lung function detector operator to the subject, and the subject cannot correctly adjust the oral or tongue posture during exhalation; there are also subjects who cannot achieve the correct posture even if they know to adjust the oral or tongue posture. Summary of the Invention

[0005] The primary technical problem to be solved by the present invention is to provide a lung function detection method for preventing tongue blockage and air leakage.

[0006] Another technical problem to be solved by the present invention is to provide a lung function detector for implementing the above lung function detection method.

[0007] To achieve the above technical objectives, the present invention adopts the following technical solutions:

[0008] According to the first aspect of the embodiment of the present invention, a lung function detection method for preventing tongue blockage and air leakage is provided, including the following steps:

[0009] Step S1: Record the exhalation curve of the subject;

[0010] Step S2: Record the inspiratory curve of the subject;

[0011] Step S3: Compare the expiratory curve with the tongue-blocking curve. If they match, inform the subject with an audible or visual signal, and go back to Step S1 for re-detection until the predetermined number of times is reached, then enter Step S5; if they do not match, go to Step S4;

[0012] Step S4: Take the expiratory curve as the leakage curve, and the horizontal-axis value of the intersection point of the end of expiration and the horizontal axis is B; take the inspiratory curve as the reference curve, and the horizontal-axis value of the intersection point of the start of inspiration and the horizontal axis is A; if A - B = a and a is greater than or equal to the preset value, inform the subject with an audible or visual signal, and go to Step S1 for re-detection; when a is not greater than the preset value, end the detection;

[0013] Step S5: Prompt the subject to use the anti-tongue-blocking mouthpiece; the change-over valve switches the connected channels to make the detection device and the anti-tongue-blocking mouthpiece conduct, re-detect, and then end.

[0014] Preferably, the tongue-blocking curve includes a first peak, a first trough, a second peak, and a tongue-blocking inflection point; among them,

[0015] The tongue-blocking curve is a flow-volume curve, and the start of expiration has a steep rising process until reaching the first peak, and then drops to the first trough; there is the tongue-blocking inflection point between the first peak and the first trough;

[0016] The slopes of the points on the curve segment from the first peak to the tongue-blocking inflection point do not change significantly; the slope changes significantly at the tongue-blocking inflection point, and the segment from the tongue-blocking inflection point to the first trough drops suddenly.

[0017] After passing through the first trough, the tongue-blocking curve rises steeply again until reaching the second peak; then it drops, and the end of expiration asymptotes to the horizontal axis; the slope change from the second peak to the end point of the end of expiration is not obvious in the early stage and obvious in the later stage.

[0018] Preferably, the vertical-axis value of the second peak is 95% or less of the vertical-axis value of the first peak.

[0019] Preferably, the horizontal-axis value of the tongue-blocking inflection point is 80% - 95% of the horizontal-axis value of the trough.

[0020] Preferably, the leakage curve is a flow-volume curve, located in the expiratory phase of the flow-volume coordinate, and the end of expiration asymptotes to the horizontal axis.

[0021] Preferably, the reference curve is a flow-volume curve, located in the inspiratory phase of the flow-volume coordinate, the curve is smooth, the slope changes of each point are gentle, and both ends asymptote to the horizontal axis.

[0022] Preferably, the inhalation step of obtaining the control curve is the inhalation step adjacent to the exhalation step of obtaining the air leakage curve.

[0023] Preferably, the anti-tongue-blocking mouthpiece used in the step S5 includes a connecting pipe, a bite piece and a tongue depressor; wherein,

[0024] The anti-tongue-blocking mouthpiece is an integrally formed structure; the connecting pipe is a pipe structure with a long straight direction; the bite piece is a flat pipe structure with a long straight direction; the tongue depressor is a curved plate structure with a long straight direction; one end of the bite piece is connected to the connecting pipe, and the other end is connected to the tongue depressor;

[0025] The tongue depressor extends along a direction parallel to the axis of the bite piece; in a plane perpendicular to the axis of the bite piece, the projection of the tongue depressor is arc-shaped and matches the projection of the side wall of the bite piece.

[0026] Preferably, the reversing valve used in the step S5 includes a valve body and a valve core; wherein,

[0027] The valve body is provided with a valve cavity, as well as a first fluid passage, a second fluid passage and a third fluid passage that are communicated with the valve cavity; the valve core is arranged in the valve cavity and can rotate relative to the valve cavity; the valve core includes a first connection passage and a second connection passage;

[0028] When the open end of the first connection passage is only communicated with the open end of the first fluid passage, the open end of the second connection passage is only communicated with the open end of the second fluid passage or the open end of the third fluid passage;

[0029] Or, when the open end of the second connection passage is only communicated with the open end of the first fluid passage, the open end of the first connection passage is only communicated with the open end of the second fluid passage or the open end of the third fluid passage;

[0030] According to the second aspect of the embodiments of the present invention, a pulmonary function detector for implementing the above pulmonary function detection method is provided, including a detection device, a connecting pipe, a reversing valve, a common mouthpiece and an anti-tongue-blocking mouthpiece; wherein,

[0031] The reversing valve includes a first fluid passage, a second fluid passage and a third fluid passage; the detection device is connected to the first fluid passage, the common mouthpiece is connected to the second fluid passage, and the anti-tongue-blocking mouthpiece is connected to the third fluid passage;

[0032] The detection device includes a flow-volume acquisition component, a memory, a processor and a prompting component; wherein,

[0033] The first fluid passage is connected to the flow-volume acquisition component, and the gas data flowing through the reversing valve is acquired by the flow-volume acquisition component; the flow-volume acquisition component is connected to the memory and the processor, and the acquired gas data can be stored in the memory; the electronic data of the tongue-blocking curve, the air leakage curve, and the control curve are simultaneously stored in the memory;

[0034] The processor is connected to the memory and the prompting component; the processor can compare the gas data of the flow-volume acquisition component with the tongue-blocking curve, the air leakage curve, and the control curve; the prompting component can give a sound or visual signal to inform the subject being examined.

[0035] Compared with the prior art, the present invention automatically compares whether the exhalation curve matches the tongue-blocking curve and the air leakage curve to determine whether the subject makes corresponding incorrect actions, and then reminds the subject to replace the anti-tongue-blocking mouthpiece or re-conduct the detection. This method can reduce the repetitive acquisition work in pulmonary function detection, enable the operator to focus on the analysis work related to the condition, and reduce the labor intensity of the operator. Specifically, the present invention defines the tongue-blocking curve and the air leakage curve to accurately identify whether the subject has the situation of tongue blocking the mouthpiece or air leakage during the detection process. At the same time, an anti-tongue-blocking mouthpiece is designed, which can effectively prevent the tongue from blocking the mouthpiece and ensure the accuracy of the detection. In addition, by using the reversing valve, it is convenient to switch between the ordinary mouthpiece and the anti-tongue-blocking mouthpiece, so that the pulmonary function detector can flexibly adjust the detection method according to the situation of the subject. To sum up, the present invention effectively solves the problems of tongue blocking the mouthpiece and air leakage existing in the prior pulmonary function detection, improves the accuracy and efficiency of the detection, reduces the labor intensity of the operator, and has remarkable technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic structural diagram of a pulmonary function detector with anti-tongue-blocking and anti-air-leakage functions in an embodiment of the present invention;

[0037] Figure 2 is Figure 1 a schematic structural diagram of the reversing valve in

[0038] Figure 3 is Figure 2 another working state schematic diagram of the reversing valve in

[0039] Figure 4 is Figure 1 a schematic structural diagram of the detection device in

[0040] Figure 5 is Figure 1 a schematic structural diagram of the anti-tongue-blocking mouthpiece in

[0041] Figure 6 is Figure 5 the front view structural schematic diagram of the anti-tongue-blocking mouthpiece;

[0042] Figure 7 In the embodiment of the present invention, it is a schematic diagram of the tongue-blocking curve;

[0043] Figure 8 is the first example curve of the tongue-blocking curve;

[0044] Figure 9 is the second example curve of the tongue-blocking curve;

[0045] Figure 10 is the third example curve of the tongue-blocking curve;

[0046] Figure 11 is the first example curve of the cough curve;

[0047] Figure 12 is the first example curve of the uneven force curve;

[0048] Figure 13 is the second example curve of the uneven force curve;

[0049] Figure 14 In the embodiment of the present invention, it is a schematic diagram of the air leakage curve and the control curve. Specific embodiments

[0050] The following combines the drawings and specific embodiments to make a detailed and specific description of the technical content of the present invention.

[0051] The technical concept in the embodiment of the present invention is to provide a lung function detection method for preventing tongue blockage and air leakage. When the tongue of the subject blocks the mouthpiece, this situation can be determined, and the subject can be prompted to replace the corresponding anti-tongue-blocking mouthpiece. When the subject exhales with air leakage, this situation can be determined, and the subject can be prompted to retest. Specifically, the embodiment of the present invention provides a tongue-blocking curve to describe the incorrect action of the tongue blocking the mouthpiece with a flow-volume curve. Provides an air leakage curve to describe the incorrect action of air leakage with a flow-volume curve. Provides a lung function detection method to judge whether the subject has incorrect actions such as tongue blocking the mouthpiece or air leakage according to the above curves.

[0052] Pulmonary function testing depends to a great extent on the cooperation of the subject and the testing environment. Therefore, the testing process should be explained to the subject in advance, and the test should be carried out in a comfortable and well-ventilated room. However, not all subjects can perform high-quality pulmonary function testing movements, so the operator needs to give prompts and make judgments. For example, use voice or the display screen to prompt the subject: "This is a simple test, but you need to follow my instructions strictly. When I say 'inhale deeply and fully', you should tightly bite the mouthpiece with your teeth, keep your lips closed, don't stick out your tongue, and then exhale the air as quickly and as long as possible until your lungs are completely emptied or I tell you to inhale again. Then inhale deeply again." Even so, when the subject bites the mouthpiece and exhales forcefully, they will still consciously or unconsciously stick out their tongue and block the mouthpiece, resulting in the flow-volume curve obtained by the pulmonary function detector being unable to reflect the true physical condition.

[0053] It should be noted that for the flow-volume curve obtained by the pulmonary function detector, the vertical axis represents the flow rate, with the unit of liters per second (L / s), and the horizontal axis represents the volume, with the unit of liters (L). Above the horizontal axis is the exhalation phase, and below the horizontal axis is the inhalation phase. The normal curve has a steep upward process at the beginning until it reaches a peak, corresponding to the peak expiratory flow (PEF). Subsequently, the curve descends linearly, but the slope change at each point is not obvious. Finally, the slope of the curve changes significantly and asymptotes to the horizontal axis. Due to the influence of factors such as height, weight, and age, the values at each point on the flow-volume curves obtained by different subjects are not the same, but the upward and downward trends of the curves are the same, and thus the pulmonary function of the subject can be judged.

[0054] As Figure 1 shown, an embodiment of the present invention provides a pulmonary function detector 100 for implementing a pulmonary function detection method for preventing tongue blockage and air leakage, including a base 1, a detection device 2, a connecting pipe 3, a reversing valve 4, a common mouthpiece 5, and an anti-tongue-blocking mouthpiece 200. Among them, the detection device 2 is fixedly connected to the top of the base 1. One end of the connecting pipe 3 is connected to the detection device 2, and the other end of the connecting pipe 3 is connected to the first fluid passage 411 of the reversing valve 4. The second fluid passage 412 of the reversing valve 4 is connected to the common mouthpiece 5, and the third fluid passage 413 of the reversing valve 4 is connected to the anti-tongue-blocking mouthpiece 200.

[0055] As Figure 2 and Figure 3 shown, the reversing valve 4 includes a valve body 41, a valve core 42, and a valve stem. The valve body 41 is provided with a valve cavity 44 and fluid passages communicating with the valve cavity 44. The fluid passages include a first fluid passage 411, a second fluid passage 412, and a third fluid passage 413. The first fluid passage 411, the second fluid passage 412, and the third fluid passage 413 are located on the same plane. The axes of each fluid passage intersect at the same point within the space of the valve cavity 14, and the axes are distributed at a preset included angle.

[0056] The valve core 42 is installed in the valve cavity 44 and can rotate relative to the valve cavity 44. One end of the valve stem is linked with the valve core 42, and the other end passes through the valve body 41 to the outside. Preferably, the valve stem is linked with an external driving mechanism. In other words, the valve core 42 can rotate in the valve cavity 44 under the drive of the valve stem or the external driving mechanism.

[0057] The valve core 42 is provided with a connection channel corresponding to the fluid channel. The connection channel includes a first connection channel 421 and a second connection channel 422 that are mutually communicated. The axes of the first connection channel 421 and the second connection channel 422 intersect and are distributed at a preset angle. Moreover, the intersection angle of the axes of the first connection channel 421 and the second connection channel 422 corresponds to the axial intersection angle of the fluid channel. The mutually communicated end portions of the first connection channel 421 and the second connection channel 422 are connection ends 423, and the other ends are open ends. The connection end 423 between the first connection channel 421 and the second connection channel 422 is a smooth arc structure, and the cross-sectional shape of the open end of the connection channel perpendicular to the axis is circular. The plane where the connection channel is located and the plane where the fluid channel is located are in the same plane.

[0058] The open end of the connection channel is the opening on the outer surface of the valve core 42 of the connection channel, and the open end of the fluid channel is the opening end on the inner surface of the valve body 41 in the valve cavity 44. When the open end of any one connection channel is in a blocked state with each fluid channel, the other connection channel forms a sealed fit with the valve cavity 44 and is in a blocked state with any one fluid channel. When the open end of any one connection channel is in communication with the open end of the first fluid channel 411, the open end of the other connection channel is only in communication with the open end of the second fluid channel 412 or the third fluid channel 413. In other words, by rotating the valve core 42, the conduction relationship between the first fluid channel 411 and the second fluid channel 412 and the third fluid channel 413 can be changed. For example, as Figure 2 shown, the first fluid channel 411 is only in communication with the second fluid channel 412. Or as Figure 3 shown, the first fluid channel 411 is only in communication with the third fluid channel 413.

[0059] The detection device 2 is in communication with the air flow passage of the connecting pipe 3. The detection device 2 can measure the air flow rate and velocity flowing through the connecting pipe 3. The reversing valve 4 can change the connection relationship of the air flow passages of the ordinary nozzle 5 and the anti-tongue-blocking nozzle 200 with the connecting pipe 3. In other words, the reversing valve 4 can change the connection of the connecting pipe 3 to only communicate with the ordinary nozzle 5 or only communicate with the anti-tongue-blocking nozzle 200. Among them, the ordinary nozzle 5 and the anti-tongue-blocking nozzle 200 are collectively referred to as nozzles. The ordinary nozzle 5 is the nozzle provided by the prior art.

[0060] As Figure 4As shown, the detection device includes a flow-volume acquisition component 22, a memory 23, a processor 24, and a prompt component 25. Among them, the gas flow passage of the mouthpiece (commutating valve 4) is connected to the flow-volume acquisition component 22, and the flow-volume acquisition component 22 acquires gas data flowing through the mouthpiece (commutating valve 4).

[0061] The flow-volume acquisition component 22 is connected to the memory 23 and the processor 24, and the acquired gas data can be stored in the memory 23. The electronic data of the tongue blockage curve 10, the air leakage curve 20, and the control curve 30 are simultaneously stored in the memory 23.

[0062] The processor 24 is connected to the memory 23 and the prompt component 25. The processor 24 compares the gas data of the flow-volume acquisition component 22 with the tongue blockage curve 10, the air leakage curve 20, and the control curve 30. When the comparison results match the tongue blockage curve 10, the air leakage curve 20, and the control curve 30, the prompt component 25 gives an audible or visual signal to inform the subject and the operator.

[0063] The pulmonary function detector provided by the embodiment of the present invention determines whether the subject has a situation where the tongue blocks the mouthpiece and the situation of air leakage during exhalation according to the preset curve. If the above situations occur, it can prompt the subject and the operator to replace the corresponding anti-tongue-blocking mouthpiece or re-perform the detection, so that the subject can correctly perform the pulmonary function detection action.

[0064] Figure 5 and Figure 6 As shown is the anti-tongue-blocking mouthpiece 200 used in the embodiment of the present invention. The anti-tongue-blocking mouthpiece 200 is a mouthpiece for the subject to perform inhalation and exhalation during pulmonary function detection, also known as a bite piece.

[0065] The anti-tongue-blocking mouthpiece 200 includes a connecting pipe 201, a bite piece 202, and a tongue depressor 203, which is an integrally formed structure. Among them, the connecting pipe 201 is a pipe structure with a long straight direction. The bite piece 202 is a flat pipe structure with a long straight direction. That is, in a plane perpendicular to the axis, the projection of the bite piece 202 is an ellipse, a flattened circle, or an oblong structure. The tongue depressor 203 is a curved plate structure with a long straight direction, and its shape matches the side wall of the bite piece 202. That is, in a plane perpendicular to the axis of the bite piece 202, the projection of the tongue depressor 203 is arc-shaped and matches the projection of the side wall of the bite piece 202.

[0066] One end of the connecting pipe 201 is used to connect to the flow-volume acquisition component 22, and the other end is connected to the bite piece 202. The other end of the bite piece 202 is connected to the tongue depressor 203. One end of the tongue depressor 203 is connected to the side wall of the bite piece 202, and the other end extends parallel to the axis direction of the bite piece 202. The bending direction and curvature of the tongue depressor 203 match the side wall of the bite piece 202. Preferably, the diameter size of the connecting pipe 201 is larger than that of the bite piece 202, and a transition slope is provided at the connection between the connecting pipe 201 and the bite piece 202.

[0067] In an exemplary embodiment, the length of the bite 202 is 2 to 3 cm, and the length of the tongue depressor 203 is 0.5 to 3 cm. Preferably, the length of the tongue depressor 203 is 2 ± 0.5 cm.

[0068] The anti-tongue-blocking mouthpiece 200 is used to connect to the flow-volume acquisition component 22 for the subject to perform inhalation and exhalation. The bite 202 and the tongue depressor 203 extend into the subject's oral cavity. The tongue depressor 203 presses on the subject's tongue. The subject bites the bite 202 and wraps the lips around the anti-tongue-blocking mouthpiece 200 to perform pulmonary function testing. The tongue depressor 203 presses on the subject's tongue, so it can prevent the subject's tongue from blocking the anti-tongue-blocking mouthpiece 200, and thus the pulmonary function testing action can be correctly completed.

[0069] As Figure 7 shown, an embodiment of the present invention provides a pulmonary function detection method for preventing tongue blockage and air leakage, which detects that the subject has made a wrong action of blocking the mouthpiece with the tongue based on the tongue blockage curve 10 (flow-volume curve). The tongue blockage curve 10 includes a first peak 11, a first trough 12, a second peak 13, and a tongue blockage inflection point 14.

[0070] The tongue blockage curve 10 is located in the expiratory phase of the flow-volume coordinate. The expiratory starting end has a steep rising process until it reaches the first peak 11, and then drops to the first trough 12. There is a tongue blockage inflection point 14 between the first peak 11 and the first trough 12. Among them, the curve segment from the first peak 11 to the tongue blockage inflection point 14 is convex, and the concavity and convexity of the curve change at the tongue blockage inflection point 14, so that the curve segment from the tongue blockage inflection point 14 to the first trough 12 suddenly drops sharply and becomes concave. In other words, the tongue blockage inflection point 14 is an inflection point where the concavity and convexity (the sign of the second derivative of the curve) change (from negative to positive) before the first trough 12. Here, the first trough 12 refers to the first point where the flow value of the curve is greater than 0 and less than 2 and the slope (first derivative) is 0. The peak is a point that can be automatically recognized by the existing pulmonary function detector.

[0071] After the tongue blockage curve 10 passes through the first trough 12, it rises steeply again until it reaches the second peak 13, and then drops to reach the non-effort-dependent part. The slope change of the curve from the second peak 13 to the end point of the expiratory end of the tongue blockage curve 10 is not obvious in the early stage and obvious in the later stage, and asymptotes to the horizontal axis.

[0072] Moreover, the vertical axis value (flow rate value) of the second peak 13 is lower than that of the first peak 11. For example, the vertical axis value of the second peak 13 is 95% or less of the value of the first peak 11. This is because the subject exerts the greatest force and has the highest airflow velocity at the beginning of exhalation, which then gradually decreases. When the tongue blocks the mouthpiece, the airflow velocity decreases sharply, which is shown as the tongue block inflection point 14 on the tongue block curve 10. During the tongue block, the respiratory muscles continue to build up force and the lung pressure increases. When the tongue leaves the mouthpiece, the airflow velocity rises rapidly, which is shown as a steep rise after the first valley point 12 on the tongue block curve 10. After the lung pressure is released, the second peak is reached. Since the volume of air in the lungs is less than the initial volume at this time, the second peak 13 will not be higher than the first peak 11. After the second peak 13, the curve asymptotes to the horizontal axis.

[0073] The tongue block curve 10 has a first peak 11, a first valley point 12, a second peak 13, and a tongue block inflection point 14, indicating that the tongue blocks the mouthpiece at the moment of the tongue block inflection point 14 and the tongue leaves the mouthpiece at the moment of the first valley point 12. The re - rise of the tongue block curve 10 at the first valley point 12 is the curve characterization of the subject retracting the tongue after blocking the mouthpiece with the tongue.

[0074] In mathematical terms, the tongue block curve 10 is a function of flow rate with respect to volume represented by F(V). The first peak 11, the first valley point 12, the second peak 13, and the tongue block inflection point 14 are all inflection points of the tongue block curve 10. The characteristics of an inflection point are: ① The first - order derivative F'(V) is close to 0 on the left side of the inflection point, indicating slow change; ② The first - order derivative F'(V) is negative on the right side of the inflection point and has a large absolute value, indicating a sharp decline; ③ The second - order derivative F"(V) changes from positive to negative at the inflection point, indicating a change in the concavity of the curve.

[0075] Through the mathematical tools and image recognition tools provided by the prior art, each point of the tongue block curve 10 can be distinguished, including the first peak 11, the first valley point 12, the second peak 13, and the tongue block inflection point 14. Preferably, the judgment basis for the first valley point 12 is that its ordinate value is less than a preset value. For example, the preset value ranges from 0.8 to 1.2 L / s. Preferably, the tongue block inflection point 14 is close to the side of the first valley point 12. For example, the horizontal axis value of the tongue block inflection point 14 is 80% - 95% of the horizontal axis value of the first valley point 12.

[0076] As Figures 8 - 10 shown, the tongue block curve has only two peaks, namely the first peak 11 and the second peak 13, to distinguish it from the curve of coughing during exhalation. As Figure 11 shown, the curve of coughing during exhalation has multiple peaks.

[0077] Preferably, the curve segments at the first peak 11 and the second peak 13 are approximately acute - angled, rather than an arc with a slowly changing curvature, to distinguish it from the curve of uneven force during exhalation. AsFigures 12 - 13 As shown, for the curve of uneven force during exhalation, even if there are only two peaks, the curve segment with one peak is arc-shaped. Preferably, when the curvature is greater than a preset value (such as 2 - 5), it is determined that the curve segment is approximately an acute angle, which is the curve peak of tongue blockage; when the curvature is less than the preset value, for example, 0, it is the curve of uneven force.

[0078] Moreover, the curve of uneven force does not have the aforementioned inflection point.

[0079] As Figure 14 shown, the method for detecting lung function against tongue blockage and air leakage according to an embodiment of the present invention also determines the situation where the subject leaks air outside the mouthpiece during the exhalation phase (i.e., air leakage, not all exhaled air enters the lung function detector) based on the air leakage curve 20. The air leakage curve 20 is located in the exhalation phase of the flow - volume coordinate, and the end of exhalation asymptotically approaches the horizontal axis, and the value of the intersection with the horizontal axis is B.

[0080] The inhalation step adjacent to the exhalation step for obtaining the air leakage curve 20 has a curve as the reference curve 30. The reference curve 30 is located in the inhalation phase of the flow - volume coordinate, the curve is smooth, and the slope changes of each point are gentle. The two ends of the reference curve 30 asymptotically approach the horizontal axis, the inhalation start end is the intersection with the horizontal axis (the value is A), and the inhalation end is the coordinate origin.

[0081] The value A of the inhalation start end of the reference curve 30 is greater than the value B of the exhalation end of the air leakage curve 20, that is, A - B = a. When a is greater than or equal to the preset value, it is considered that the volume change of the air volume in this inhalation and exhalation process fails to form a closed loop, indicating that the subject leaks air during the exhalation phase. For example, a ≥ 2% × A. Preferably, a ≥ 4% × A.

[0082] The embodiment of the present invention provides a method for detecting lung function against tongue blockage and air leakage, which determines the situation of uneven force or air leakage of the subject based on the characteristics of the aforementioned two curves. The method includes the following steps.

[0083] Step S1: Record the exhalation curve of the subject.

[0084] The exhalation curve is the flow - volume curve during the exhalation process in this step, the start end is the coordinate origin, and the end asymptotically approaches the horizontal axis.

[0085] The subject exhales forcefully until the plateau phase, and the exhalation flow rate decreases to a very low level and hardly decreases any further, which indicates that the subject has exhaled as much air from the lungs as possible. If the volume change of the flow - volume curve in the last 1 second is less than 0.025 L, it is considered that the plateau phase has been reached, which is a sign of a satisfactory end of forced exhalation (EOFE).

[0086] Step S2: Record the inhalation curve of the subject.

[0087] The inhalation curve is the flow-volume curve during the inhalation process in this step. The starting end is the intersection point with the horizontal axis (the value is A), and the ending end asymptotically approaches the coordinate origin.

[0088] Step S3: Compare the exhalation curve with the tongue-blocking curve 10. If they match, inform the subject with an audible or visual signal, and go back to step S1 for re-detection until the predetermined number of times (for example, 3 times) is reached, then enter step S5; if they do not match, go to step S4.

[0089] Here, "matching" means that the exhalation curve of the subject has a first peak, an inflection point, a first trough, and a second peak, and the curvature at the first peak is greater than the preset value.

[0090] Step S4: Take the exhalation curve as the air leakage curve 20, and the horizontal axis value of the intersection point of the ending end of exhalation and the horizontal axis is B; take the inhalation curve as the control curve 30, and the horizontal axis value of the intersection point of the starting end of inhalation and the horizontal axis is A; calculate A - B = a, and compare a with the preset value; when a is greater than or equal to the preset value, inform the subject with an audible or visual signal to go to step S1 for re-detection; when a is not greater than the preset value, end the detection.

[0091] For example, if there is a difference a, and a ≥ 4% × A, it indicates that the starting end of inhalation of the inhalation curve exceeds the ending end of exhalation of the exhalation curve, indicating that the exhaled volume < inhaled volume, the subject leaks air during the exhalation stage, and the flow-volume curve does not form a complete closed loop.

[0092] Step S5: Prompt the subject to use the anti-tongue-blocking mouthpiece; the reversing valve switches the connected channels to conduct the detection device and the anti-tongue-blocking mouthpiece, re-detect, and then end.

[0093] Taking the pulmonary function detector 100 provided by the embodiment of the present invention as an example, the subject or the pulmonary function detector 100 rotates the valve stem or the external driving mechanism to rotate the valve core 42, so that the connecting pipe 3 is switched from being conducted with the ordinary mouthpiece 5 to being conducted with the anti-tongue-blocking mouthpiece 200.

[0094] The pulmonary function detection method provided by the embodiment of the present invention can determine whether the subject has the situation of tongue blocking the mouthpiece and the situation of air leakage during exhalation. If the above situations occur, it can prompt the subject and the operator to replace the corresponding anti-tongue-blocking mouthpiece or re-detect, so that the subject can correctly perform the pulmonary function detection action.

[0095] In summary, the lung function detection method and detector for preventing tongue blockage and air leakage provided by the embodiments of the present invention automatically compare whether the exhalation curve matches the tongue block curve and the air leakage curve to determine whether the subject has corresponding incorrect actions, and then remind the subject to replace the anti-tongue block mouthpiece or re-conduct the detection. The lung function detection method and detector can reduce the repetitive acquisition work in lung function detection, enable the operator to focus on the analysis work related to the condition, and reduce the labor intensity of the operator.

[0096] It should be noted that the above-mentioned multiple embodiments are only examples. The technical solutions of each embodiment can be combined and are all within the protection scope of the present invention.

[0097] The orientation or positional relationship indicated by terms such as "upper", "lower", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings. It is 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 thus cannot be construed as a limitation of the present invention.

[0098] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more, unless otherwise specifically defined.

[0099] The above has described in detail the lung function detection method and detector for preventing tongue blockage and air leakage provided by the present invention. For those of ordinary skill in the art, any obvious changes made without departing from the essence of the present invention will constitute an infringement of the patent right of the present invention and will bear corresponding legal responsibilities.

Claims

1. A lung function testing method for preventing tongue blockage and air leakage, characterized in that The following steps are involved: Step S1: recording the exhalation curve of the subject; Step S2: recording the inhalation curve of the subject; Step S3: Compare the exhalation curve with the tongue blocking curve. If they match, inform the subject with a sound or visual signal and go to step S1 for retesting until a predetermined number of times is reached, then go to step S5; if they do not match, go to step S4; Step S4: taking the exhalation curve as the leakage curve, and taking the horizontal axis value of the intersection of the end of exhalation and the horizontal axis as B; taking the inhalation curve as the control curve, and taking the horizontal axis value of the intersection of the start of inhalation and the horizontal axis as A; if A-B=a, and a is greater than or equal to the preset value, informing the subject with a sound or visual signal, and going to step S1 to re-test; When a is not greater than the preset value, the detection ends; Step S5: prompting the subject to use the tongue-blocking prevention mouthpiece; the reversing valve switches the communication channel to connect the detection device and the tongue-blocking prevention mouthpiece, re-detecting, and then ending.

2. The method for detecting lung function according to claim 1, characterized in that The tongue blocking curve includes a first peak, a first valley point, a second peak and a tongue blocking inflection point; wherein, The tongue blockage curve is a flow-volume curve, which has a steep rise at the beginning of exhalation until it reaches the first peak, and then drops to the first valley point; the tongue blockage inflection point is between the first peak and the first valley point; The slope of each point on the curve from the first peak to the tongue plug inflection point does not change significantly; the slope at the tongue plug inflection point changes significantly, and the slope from the tongue plug inflection point to the first valley point drops suddenly; After passing the first valley point, the tongue blocking curve rises steeply again until it reaches the second peak value; then it drops, and the end of exhalation asymptotically approaches the horizontal axis; the slope change from the second peak value to the end of exhalation is not obvious in the early stage, but changes significantly in the later stage.

3. The lung function testing method according to claim 2, characterized in that: The vertical axis value of the second peak is 95% or less of the vertical axis value of the first peak.

4. The lung function testing method according to claim 3, characterized in that: The horizontal axis value of the tongue blocking inflection point is 80% to 95% of the horizontal axis value of the valley point.

5. The lung function testing method according to claim 1, wherein: The leakage curve is a flow-volume curve, which is located in the exhalation phase of the flow-volume coordinate, and the end of exhalation is asymptotic to the horizontal axis.

6. The lung function testing method according to claim 5, characterized in that: The control curve is a flow-volume curve, which is located in the inspiratory phase of the flow-volume coordinate. The curve is smooth, the slope of each point changes gently, and both ends are asymptotic to the horizontal axis.

7. The lung function testing method according to claim 6, characterized in that: The inspiratory step for obtaining the control curve is the inspiratory step adjacent to the expiratory step for obtaining the leakage curve.

8. The method for detecting lung function according to claim 1, characterized in that The tongue blocking prevention mouthpiece used in step S5 comprises a connecting tube, a mouthpiece and a tongue depressor; wherein, The anti-tongue-blocking mouthpiece is an integrally formed structure; the connecting tube is a tube structure with a long straight direction; the bite is a flat tube structure with a long straight direction; the tongue depressor is a curved plate structure with a long straight direction; one end of the bite is connected to the connecting tube, and the other end is connected to the tongue depressor; The depressing tongue extends in a direction parallel to the axis of the bite; in a plane perpendicular to the axis of the bite, the projection of the depressing tongue is in an arc shape and matches the projection of the side wall of the bite.

9. The method for detecting lung function according to claim 1, characterized in that The reversing valve used in step S5 includes a valve body and a valve core; wherein, The valve body is provided with a valve cavity, and a first fluid channel, a second fluid channel and a third fluid channel communicated with the valve cavity; the valve core is arranged in the valve cavity and can rotate relative to the valve cavity; the valve core includes a first connecting channel and a second connecting channel; When the opening end of the first connecting channel is only connected to the opening end of the first fluid channel, the opening end of the second connecting channel is only connected to the opening end of the second fluid channel or the third fluid channel; Alternatively, when the opening end of the second connecting channel is only in communication with the opening end of the first fluid channel, the opening end of the first connecting channel is only in communication with the opening end of the second fluid channel or the third fluid channel.

10. A pulmonary function tester, used to implement the pulmonary function test method according to any one of claims 1 to 9, characterized in that It includes a detection device, a connecting pipe, a reversing valve, a common mouthpiece and a tongue-blocking-proof mouthpiece; wherein, The reversing valve comprises a first fluid channel, a second fluid channel and a third fluid channel; the detection device is connected to the first fluid channel, the common mouthpiece is connected to the second fluid channel, and the tongue-blocking prevention mouthpiece is connected to the third fluid channel; The detection device includes a flow-volume acquisition component, a memory, a processor and a prompt component; wherein, The first fluid channel is connected to the flow-volume acquisition component, and the flow-volume acquisition component acquires gas data flowing through the reversing valve; the flow-volume acquisition component is connected to the memory and the processor, and the acquired gas data can be stored in the memory; the memory simultaneously stores electronic data of the tongue plugging curve, the air leakage curve and the control curve; The processor is connected to the memory and the prompt component; the processor can compare the gas data of the flow-volume acquisition component with the tongue blockage curve, the leakage curve and the control curve; the prompt component can give a sound or visual signal to inform the subject.

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