Portable respiratory tract secretion removing device

Abstract

The invention relates to the technical field of medical sputum removal equipment, in particular to a portable respiratory tract secretion removal device. The device comprises a support, a working set is arranged in the support, the working set comprises a negative pressure generator, the negative pressure generator at least comprises an air suction barrel, a piston is slidably connected in the air suction barrel, an air inlet is formed in the bottom of the air suction barrel, and a plurality of air leakage openings are formed in the side wall of the air suction barrel. The bottom of the air inlet is communicated with an air inlet assembly; a plurality of buffer assemblies are slidably connected to the bottom of the air suction cylinder, and pressure relief assemblies are arranged below the buffer assemblies; according to the portable respiratory tract secretion removing device, the arranged piston is used for generating negative pressure in the air suction barrel, when the piston slides in the air suction barrel, the buffering assembly is used for preventing the negative pressure in the air suction barrel from increasing too fast, and the buffering assembly can further ensure the air tightness of the connector of the air suction barrel and the buffering assembly.

Description

Technical Field

[0001] The invention relates to the technical field of medical expectorant equipment, in particular to a portable respiratory secretion removing device. Background Art

[0002] In the medical field, portable secretion removal devices are essential to keep patients' airways open. With the continuous development of medical technology, the demand for the portability and effectiveness of such devices is increasing.

[0003] At present, the negative pressure generating devices in portable secretion removal devices are mainly of two types: electric negative pressure pumps and manual negative pressure pumps. Although the electric negative pressure pump is relatively easy to operate, it has limited gear adjustment and a large negative pressure span, which makes it difficult to meet certain situations where high negative pressure accuracy is required. Although the manual negative pressure pump can theoretically achieve more flexible negative pressure adjustment, it is affected by many factors of the operator, such as lack of experience, physical fatigue or external interference, resulting in unstable pressure application and large fluctuations in negative pressure, which causes discomfort to patients and affects the treatment effect and comfort. In actual clinical applications, both the limitations of the electric negative pressure pump and the instability of the manual negative pressure pump pose challenges to the performance and reliability of the portable secretion removal device. How to optimize the negative pressure generating device so that it can provide accurate and stable negative pressure while meeting the requirements of portability and ease of operation has become a technical problem that urgently needs to be solved.

[0004] In view of this, we propose a portable respiratory secretion clearing device to improve the deficiencies in the prior art. Summary of the invention

[0005] The object of the present invention is to provide a portable respiratory secretion clearing device to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides a portable respiratory secretion clearing device, including a bracket, wherein a working group is provided in the bracket.

[0007] The working group includes a negative pressure generator, which includes at least a vacuum pump, a piston is slidably connected inside the vacuum pump, an air inlet is provided at the bottom of the vacuum pump, a plurality of air release ports are provided on the side wall of the vacuum pump, and the bottom of the air inlet is connected to an air intake assembly;

[0008] The bottom of the vacuum cylinder is slidably connected with a plurality of buffer components, and a pressure relief component is disposed below each of the buffer components. The top of the buffer component is fixedly connected to the bottom of the piston, and the bottom of the pressure relief component is slidably connected to the air intake component.

[0009] The piston is used to generate negative pressure in the vacuum cylinder. When the piston slides in the vacuum cylinder, the buffer assembly is used to prevent the negative pressure in the vacuum cylinder from increasing too quickly, and the buffer assembly can also ensure the airtightness of the interface between the vacuum cylinder and the buffer assembly. When the piston slides slowly in the vacuum cylinder, the pressure relief assembly is used to prevent the air intake assembly from leaking to the outside. When the piston slides quickly in the vacuum cylinder, the buffer assembly pulls the pressure relief assembly away from the air intake assembly. The pressure relief assembly is used to discharge part of the gas in the vacuum cylinder to the outside.

[0010] As a further improvement of the present technical solution, the negative pressure generator further includes an exhaust one-way valve arranged in the air intake assembly and an exhaust one-way valve arranged in a plurality of air release ports.

[0011] As a further improvement of the present technical solution, the air intake assembly includes an exhaust pipe parallel to the direction of piston movement, and the air intake assembly also includes a pair of exhaust pipes perpendicular to the exhaust pipe, the two exhaust pipes are connected to a slide groove at one end away from each other, the openings of the two slide grooves are both facing the exhaust cylinder, and the exhaust one-way valve is located in the exhaust pipe.

[0012] As a further improvement of the present technical solution, the buffer assembly includes a guide rod slidably connected to the bottom of the vacuum cylinder, the guide rod passes through the vacuum cylinder, a sealing sleeve is sleeved on the outside of the guide rod, the sealing sleeve is fixedly connected to the vacuum cylinder, one end of the guide rod is fixedly connected to a limiting cap on the outside of the vacuum cylinder, a spring group is sleeved between the guide rod and the limiting cap, and the end of the guide rod away from the limiting cap is fixedly connected to the piston.

[0013] As a further improvement of the present technical solution, the spring group includes a first spring, a connecting ring and a second spring, one end of the first spring is fixedly connected to the sealing sleeve, the end of the first spring away from the sealing sleeve is fixedly connected to one side of the connecting ring, the side of the connecting ring away from the first spring is fixedly connected to the second spring, and the end of the second spring away from the connecting ring is fixedly connected to the limiting cap.

[0014] As a further improvement of the present technical solution, the pressure relief assembly includes several limit blocks fixedly connected to the inner side of the connecting ring, several ends of the limit blocks away from the connecting ring are slidably connected to the guide rod, several bottoms of the limit blocks are fixedly connected with elastic ropes, several bottoms of the elastic ropes are fixedly connected with a pressure relief block, and the pressure relief block is slidably connected to the slide groove.

[0015] As a further improvement of the technical solution, the piston includes a plug head, a slot is provided on the outer wall of the plug head, a pressure pad is clamped in the slot, and the outer ring of the pressure pad is in contact with the inner wall of the vacuum cylinder.

[0016] As a further improvement of the technical solution, the inner wall of the slide groove is a frosted surface, and the material of the pressure relief block is rubber.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. In the portable respiratory secretion clearing device, a piston is provided to generate negative pressure in the vacuum cylinder. When the piston slides in the vacuum cylinder, the buffer assembly is used to prevent the negative pressure in the vacuum cylinder from increasing too quickly, and the buffer assembly can also ensure the airtightness of the interface between the vacuum cylinder and the buffer assembly. Specifically, when the operator pulls the piston to slide on the inner wall of the vacuum cylinder, the piston drives the guide rod to slide upward, and the limit cap at the bottom of the guide rod compresses the spring group. On the one hand, if the operator's movement amplitude is too large, the energy absorption effect of the spring group will convert part of the kinetic energy generated by the operator's driving force into the elastic potential energy of the spring group; on the other hand, the restoring force generated by the compression of the spring group will squeeze the sealing sleeve to make it close to the interface between the guide rod and the vacuum cylinder.

[0019] 2. In the portable respiratory secretion clearing device, when the piston slides slowly in the vacuum cylinder, the pressure relief component is used to prevent the air intake component from leaking to the outside. When the piston slides quickly in the vacuum cylinder, the buffer component pulls the pressure relief component away from the air intake component, and the pressure relief component is used to discharge part of the gas in the vacuum cylinder to the outside. Specifically, since the pressure relief block and the inner wall of the slide groove have been specially treated, when the operator slowly pulls the piston, the friction between the pressure relief block and the slide groove is greater than the elastic force of the spring group. The upward moving spring group cannot pull the pressure relief block out of the slide groove. The pressure relief block blocks the air release pipe, ensuring the air tightness of the air release pipe when the air is introduced into the vacuum pipe. When the operator pulls the piston too much, the friction between the pressure relief block and the slide groove will be less than the elastic force of the spring group. The upward moving spring group will pull the pressure relief block out of the slide groove. The excessive negative pressure generated in the vacuum cylinder will become smaller due to the discharge of part of the gas from the air release pipe, thereby reducing the suction force on the patient's throat. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a partially cut-away front view of the present invention;

[0022] Figure 3 It is a cutaway front view of the negative pressure generator of the present invention;

[0023] Figure 4 It is a cutaway front view of the air intake assembly of the present invention;

[0024] Figure 5 It is a structural diagram of the buffer assembly of the present invention;

[0025] Figure 6 is a cutaway view of a pressure relief assembly of the present invention;

[0026] Figure 7 For the present invention Figure 6 Enlarged view of point A in the middle;

[0027] Figure 8 It is a right side view of the pressure relief assembly of the present invention;

[0028] Fig. 9 It is a cutaway front view of the piston of the present invention.

[0029] The meaning of each number in the figure is:

[0030] 10. Bracket;

[0031] 20. Negative pressure generator; 21. Vacuum pump; 22. Piston; 23. Air inlet; 24. Air inlet assembly; 25. Air release port; 26. Air extraction check valve; 27. Exhaust check valve;

[0032] 30. Buffer assembly; 31. Guide rod; 32. Sealing sleeve; 33. Limiting cap; 34. Spring assembly;

[0033] 40. Pressure relief assembly; 41. Elastic rope; 42. Limit block; 43. Pressure relief block;

[0034] 51. exhaust pipe; 52. exhaust pipe; 53. chute;

[0035] 61. first spring; 62. connecting ring; 63. second spring;

[0036] 71. Plug; 72. Slot; 73. Pressure pad. DETAILED DESCRIPTION

[0037] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0040] Example

[0041] See also Figure 1-Figure 9 As shown, the purpose of this embodiment is to provide a portable respiratory secretion clearing device, including a bracket 10, a working group is provided in the bracket 10,

[0042] The working group includes a negative pressure generator 20, which includes at least a vacuum cylinder 21, a piston 22 is slidably connected inside the vacuum cylinder 21, an air inlet 23 is provided at the bottom of the vacuum cylinder 21, a plurality of air release ports 25 are provided on the side wall of the vacuum cylinder 21, and an air inlet assembly 24 is connected to the bottom of the air inlet 23;

[0043] The bottom of the vacuum cylinder 21 is slidably connected with a plurality of buffer components 30, and a pressure relief component 40 is disposed below each of the buffer components 30. The top of the buffer component 30 is fixedly connected to the bottom of the piston 22, and the bottom of the pressure relief component 40 is slidably connected to the air intake component 24.

[0044] In order to suck out the secretions accumulated in the patient's respiratory tract, a piston 22 is provided to generate negative pressure when it slides up and down in the vacuum cylinder 21. When the piston 22 slides in the vacuum cylinder 21, the buffer assembly 30 is used to prevent the negative pressure in the vacuum cylinder 21 from increasing too quickly, and the buffer assembly 30 can also ensure the airtightness of the interface between the vacuum cylinder 21 and the buffer assembly 30. When the piston 22 slides slowly in the vacuum cylinder 21, the pressure relief assembly 40 is used to prevent the air intake assembly 24 from leaking to the outside. When the piston 22 slides quickly in the vacuum cylinder 21, the buffer assembly 30 pulls the pressure relief assembly 40 away from the air intake assembly 24. The pressure relief assembly 40 is used to discharge a portion of the gas with a higher pressure in the vacuum cylinder 21 to the outside.

[0045] When the pumping piston 22 slides up and down in the suction cylinder 21, if the operator of the respiratory secretion clearing device pumps air too much due to lack of experience or interference from external factors, it will cause great discomfort in the throat of the patient. In order to reduce the impact of excessive pumping on the patient, a buffer component 30 is provided to reduce the fluctuation amplitude of the negative pressure generated in the negative pressure generator 20.

[0046] like Figure 5 As shown, first, the specific structure of the buffer assembly 30 is disclosed. The buffer assembly 30 includes a guide rod 31 slidably connected to the bottom of the vacuum cylinder 21, the guide rod 31 penetrates the vacuum cylinder 21, and a sealing sleeve 32 is sleeved on the outer side of the vacuum cylinder 21 of the guide rod 31, and the sealing sleeve 32 is fixedly connected to the vacuum cylinder 21. One end of the guide rod 31 on the outer side of the vacuum cylinder 21 is fixedly connected to a limiting cap 33, and a spring group 34 is sleeved between the guide rod 31 and the limiting cap 33. The end of the guide rod 31 away from the limiting cap 33 is fixedly connected to the piston 22;

[0047] Furthermore, when the operator pulls the piston 22 to slide on the inner wall of the air pump 21, the piston 22 drives the guide rod 31 to slide upward, and the limit cap 33 at the bottom of the guide rod 31 compresses the spring group 34. On the one hand, if the operator's movement amplitude is too large, the energy absorption effect of the spring group 34 converts part of the kinetic energy generated by the operator's driving force into the elastic potential energy of the spring group 34; on the other hand, the restoring force generated by the compression of the spring group 34 will squeeze the sealing sleeve 32 to make it close to the interface between the guide rod 31 and the air pump 21.

[0048] When the operator of the device sucks air with a large amplitude, in order to prevent excessive negative pressure from causing damage to the patient's throat, a pressure relief component 40 is provided which can automatically discharge a portion of the gas when the pressure in the negative pressure generator 20 is too high.

[0049] Figure 6 and Figure 8 The positional relationship between the pressure relief assembly 40 and the air intake assembly 24 is shown. The specific structure of the pressure relief assembly 40 is disclosed below. The pressure relief assembly 40 includes a plurality of limit blocks 42 fixedly connected to the inner side of the connecting ring 62. One end of the plurality of limit blocks 42 away from the connecting ring 62 is slidably connected to the guide rod 31. The bottoms of the plurality of limit blocks 42 are fixedly connected to elastic ropes 41. The bottoms of the plurality of elastic ropes 41 are fixedly connected to a pressure relief block 43. The pressure relief block 43 is slidably connected to the slide groove 53.

[0050] Furthermore, since the pressure relief block 43 and the inner wall of the chute 53 have been specially treated, when the operator slowly pulls the piston 22, the friction between the pressure relief block 43 and the chute 53 is greater than the elastic force of the spring group 34, and the upwardly moving spring group 34 cannot pull the pressure relief block 43 out of the chute 53, and the pressure relief block 43 blocks the air release pipe 52, ensuring the air tightness of the air release pipe 52 when the air extraction pipe 51 is inhaled. When the operator pulls the piston 22 too much, the friction between the pressure relief block 43 and the chute 53 will be less than the elastic force of the spring group 34, and the upwardly moving spring group 34 will pull the pressure relief block 43 out of the chute 53, and the excessive negative pressure generated in the air extraction cylinder 21 will be reduced due to the discharge of part of the gas from the air release pipe 52, thereby reducing the suction force generated on the patient's throat.

[0051] In order to generate negative pressure to clean the patient's respiratory secretions, and to ensure that when the piston 22 slides upward in the suction cylinder 21, only the outside air enters the suction cylinder 21 from the air inlet 23, and when the piston 22 slides downward in the suction cylinder 21, the air in the suction cylinder 21 is only discharged to the outside through the air discharge port 25. Therefore, an air suction check valve 26 and an air discharge check valve 27 are respectively provided for controlling the direction of air entering and exiting the suction cylinder 21.

[0052] like Figure 3 As shown, the negative pressure generator 20 also includes an exhaust check valve 26 arranged in the air intake component 24 and an exhaust check valve 27 arranged in a plurality of exhaust ports 25; the air intake component 24 includes an exhaust pipe 51 parallel to the movement direction of the piston 22, and the air intake component 24 also includes a pair of exhaust pipes 52 perpendicular to the exhaust pipe 51, and the ends of the two exhaust pipes 52 away from each other are connected to a slide groove 53, and the openings of the two slide grooves 53 are both facing the exhaust cylinder 21, and the exhaust check valve 26 is located in the exhaust pipe 51.

[0053] The improvement is that when the piston 22 is pulled to move upward, the external gas enters the air pump 21 through the air pumping pipe 51, and the air pumping check valve 26 ensures that the gas passing through the air pumping pipe 51 can only enter but not exit. When the piston 22 is pushed to move downward, the external gas is discharged to the outside through the air release port 25, and the exhaust check valve 27 ensures that the gas passing through the air release port 25 can only exit but not enter. If the piston 22 is pulled too far, the spring group 34 will pull the pressure relief block 43 out of the slide groove 53 with a reduced friction coefficient, so that the air release pipe 52 can discharge part of the gas in the air pump 21, thereby achieving a pressure reduction buffering effect.

[0054] In order to automatically determine whether it is necessary to start the pressure relief assembly 40 to relieve pressure in the vacuum cylinder 21 according to the operator's pumping amplitude of the piston 22, a spring group 34 is provided to automatically identify changes in the friction coefficient between the pressure relief block 43 and the inner wall of the slide groove 53.

[0055] Figure 7The connection position relationship between the spring group 34 and the pressure relief assembly 40 is shown. The spring group 34 includes a first spring 61, a connecting ring 62 and a second spring 63. One end of the first spring 61 is fixedly connected to the sealing sleeve 32, the end of the first spring 61 away from the sealing sleeve 32 is fixedly connected to a side of the connecting ring 62, the side of the connecting ring 62 away from the first spring 61 is fixedly connected to the second spring 63, and the end of the second spring 63 away from the connecting ring 62 is fixedly connected to the limiting cap 33.

[0056] The improvement lies in that: in the process of pulling the piston 22 upward, the guide rod 31 will slide at the bottom of the vacuum cylinder 21, and the limit block 42 will be driven by the upward connecting ring 62 to slide upward along the outer wall of the guide rod 31. When the elastic force generated by the deformation of the spring group 34 exceeds the friction force between the pressure relief block 43 and the slide groove 53, the elastic rope 41 will pull the pressure relief block 43 out of the slide groove 53.

[0057] When the piston 22 slides in the vacuum cylinder 21 to generate negative pressure, in order to ensure the stability of the movement of the piston 22 and prevent it from slipping during operation, causing the negative pressure to fluctuate and causing damage to the patient's throat, the outer wall of the piston 22 is treated to enhance the airtightness and stability.

[0058] Fig. 9 The positional relationship between the piston 22 and the vacuum cylinder 21 is shown. The piston 22 includes a plug 71. A slot 72 is formed on the outer wall of the plug 71. A pressure pad 73 is clamped in the slot 72. The outer ring of the pressure pad 73 fits against the inner wall of the vacuum cylinder 21.

[0059] The improvement is that the material of the pressure pad 73 is rubber; rubber is elastic and can fit tightly to the inner wall of the vacuum cylinder 21, effectively preventing gas leakage and improving the efficiency and stability of the piston 22. During the movement of the piston 22, the rubber pressure pad 73 can absorb and buffer the impact force, reduce vibration and noise. Due to the elasticity of rubber, the pressure pad 73 can adapt to a certain degree of dimensional deviation and irregular shape, ensuring a good sealing effect.

[0060] When the piston 22 is pulled to slide slowly upward in the air pump 21, it is necessary to ensure that only external gas enters the air pump 21. If the piston 22 slides upward in the air pump 21 too fast, in order to prevent the negative pressure generated by the negative pressure generator 20 in the patient's respiratory tract from being too large, causing the patient to feel strong discomfort, the inner surface of the slide groove 53 and the pressure relief block 43 are specially treated.

[0061] Therefore, the inner wall of the slide groove 53 is a frosted surface, and the pressure relief block 43 is made of rubber.

[0062] The improvement is that when the pressure relief block 43 made of rubber material slowly slides against each other in the rough surface slide groove 53, the protrusions on the rough surface of the slide groove 53 will embed into the pressure relief block 43 made of rubber material, generating a large friction force. When the sliding speed is too fast, the friction force will decrease due to the elasticity of the rubber and the dynamic changes of the surface.

[0063] In summary, the working principle of this solution is as follows: first, when the operator pulls the piston 22 to slide on the inner wall of the vacuum cylinder 21, the piston 22 drives the guide rod 31 to slide upward, and the limit cap 33 at the bottom of the guide rod 31 compresses the spring group 34. On the one hand, if the operator's movement amplitude is too large, the energy absorption effect of the spring group 34 converts part of the kinetic energy generated by the operator's driving force into the elastic potential energy of the spring group 34; on the other hand, the restoring force generated by the compression of the spring group 34 will squeeze the sealing sleeve 32 to make it close to the interface between the guide rod 31 and the vacuum cylinder 21.

[0064] Since the pressure relief block 43 and the inner wall of the chute 53 have been specially treated, when the operator slowly pulls the piston 22, the friction between the pressure relief block 43 and the chute 53 is greater than the elastic force of the spring group 34, and the spring group 34 moving upward cannot pull the pressure relief block 43 out of the chute 53, and the pressure relief block 43 blocks the air release pipe 52, ensuring the air tightness of the air release pipe 52 when the air extraction pipe 51 is inhaled. When the operator pulls the piston 22 too much, the friction between the pressure relief block 43 and the chute 53 will be less than the elastic force of the spring group 34, and the spring group 34 moving upward will pull the pressure relief block 43 out of the chute 53, and the excessive negative pressure generated in the air extraction cylinder 21 will be reduced due to the discharge of part of the gas from the air release pipe 52, thereby reducing the suction force generated on the patient's throat.

[0065] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A portable respiratory secretion removal device, characterized in that: It comprises a support (10), wherein a working group is arranged inside the support (10), The working group comprises a negative pressure generator (20), the negative pressure generator (20) at least comprising a vacuum cylinder (21), a piston (22) being slidably connected inside the vacuum cylinder (21), an air inlet (23) being provided at the bottom of the vacuum cylinder (21), a plurality of air release ports (25) being provided on the side wall of the vacuum cylinder (21), and an air inlet assembly (24) being connected at the bottom of the air inlet (23); The bottom of the vacuum cylinder (21) is slidably connected to a plurality of buffer assemblies (30), a pressure relief assembly (40) is provided below each of the buffer assemblies (30), the top of the buffer assembly (30) is fixedly connected to the bottom of the piston (22), and the bottom of the pressure relief assembly (40) is slidably connected to the air intake assembly (24); The piston (22) is used to generate negative pressure in the vacuum cylinder (21). When the piston (22) slides in the vacuum cylinder (21), the buffer component (30) is used to prevent the negative pressure in the vacuum cylinder (21) from increasing too quickly, and the buffer component (30) can also ensure the air tightness at the interface between the vacuum cylinder (21) and the buffer component (30). When the piston (22) slides slowly in the vacuum cylinder (21), the pressure relief component (40) is used to prevent the air intake component (24) from leaking to the outside. When the piston (22) slides quickly in the vacuum cylinder (21), the buffer component (30) pulls the pressure relief component (40) away from the air intake component (24). The pressure relief component (40) is used to discharge a portion of the gas in the vacuum cylinder (21) to the outside.

2. The portable respiratory secretion clearing device according to claim 1, characterized in that: The negative pressure generator (20) further comprises an air extraction one-way valve (26) arranged in the air intake assembly (24) and an air exhaust one-way valve (27) arranged in the plurality of air discharge ports (25).

3. The portable respiratory secretion clearing device according to claim 2, characterized in that: The air intake assembly (24) comprises an air extraction pipe (51) parallel to the movement direction of the piston (22), and the air intake assembly (24) further comprises a pair of air discharge pipes (52) perpendicular to the air extraction pipe (51), and the ends of the two air discharge pipes (52) which are away from each other are both connected to a slide groove (53), and the openings of the two slide grooves (53) are both facing the air extraction cylinder (21), and the air extraction non-return valve (26) is located in the air extraction pipe (51).

4. The portable respiratory secretion clearing device according to claim 1, characterized in that: The buffer assembly (30) comprises a guide rod (31) slidably connected to the bottom of the vacuum cylinder (21), the guide rod (31) passes through the vacuum cylinder (21), a sealing sleeve (32) is sleeved on the outer side of the vacuum cylinder (21), the sealing sleeve (32) is fixedly connected to the vacuum cylinder (21), one end of the guide rod (31) on the outer side of the vacuum cylinder (21) is fixedly connected to a limiting cap (33), a spring group (34) is sleeved between the vacuum cylinder (21) and the limiting cap (33), and one end of the guide rod (31) away from the limiting cap (33) is fixedly connected to the piston (22).

5. The portable respiratory secretion clearing device according to claim 4, characterized in that: The spring group (34) comprises a first spring (61), a connecting ring (62) and a second spring (63), wherein one end of the first spring (61) is fixedly connected to the sealing sleeve (32), the end of the first spring (61) away from the sealing sleeve (32) is fixedly connected to one side of the connecting ring (62), the side of the connecting ring (62) away from the first spring (61) is fixedly connected to the second spring (63), and the end of the second spring (63) away from the connecting ring (62) is fixedly connected to the limiting cap (33).

6. The portable respiratory secretion clearing device according to claim 4, characterized in that: The pressure relief assembly (40) comprises a plurality of limit blocks (42) fixedly connected to the inner side of the connecting ring (62), the ends of the limit blocks (42) away from the connecting ring (62) are slidably connected to the guide rod (31), the bottoms of the limit blocks (42) are fixedly connected to elastic ropes (41), the bottoms of the elastic ropes (41) are fixedly connected to a pressure relief block (43), and the pressure relief block (43) is slidably connected to the slide groove (53).

7. The portable respiratory secretion clearing device according to claim 1, characterized in that: The piston (22) comprises a plug head (71), an outer wall of the plug head (71) is provided with a clamping groove (72), a pressure pad (73) is clamped in the clamping groove (72), and the outer ring of the pressure pad (73) is in contact with the inner wall of the vacuum cylinder (21).

8. The portable respiratory secretion clearing device according to claim 6, characterized in that: The inner wall of the slide groove (53) is a frosted surface, and the pressure relief block (43) is made of rubber.

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