An anti-reflux suction tube for critically ill patients in the respiratory department

Abstract

The present invention belongs to the technical field of medical devices, and in particular to an anti-reflux suction tube for critically ill patients in a respiratory department, comprising a suction tube main body and an air inlet cap arranged on the surface of the end of the suction tube main body, a detection component being installed on the suction tube main body, the detection component comprising a plastic tube, a suction joint, a discharge joint, an end A, an end B, a U-shaped tube, a negative pressure control valve A, a negative pressure control valve B, a baffle, a rotating rod, a reset torsion spring and a pointer, the plastic tube being arranged on one side of the suction tube main body, the suction joint being fixed at one end of the plastic tube, and the discharge joint being fixed at the other end of the plastic tube, by arranging the detection component, whether the sputum is completely sucked out can be observed by the swing of the pointer, thereby avoiding sputum adhering to the inner wall of the suction tube and being difficult to observe, thereby better observing the flow of sputum, avoiding secondary suctioning, reducing the pain of patients, and meeting actual use needs.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and in particular relates to an anti-reflux sputum suction tube for critically ill patients in respiratory departments. Background Art

[0002] Sputum suction is a common nursing operation for comatose patients who are hospitalized and have excessive and sticky sputum secretion in the respiratory tract. Its purpose is to clear the secretions in the respiratory tract and keep the respiratory tract unobstructed. In clinical practice, a suction tube is usually connected to a ventilator, and the suction tube is inserted into the patient's respiratory tract to use negative pressure to suction the sputum. However, the color of the sputum produced varies with the patient's condition. For some lung cancer, tuberculosis, bronchiectasis, etc., this kind of sputum may appear, making the sputum appear red, brown, or yellow. When the sputum is sucked into the suction tube, the sputum is likely to adhere to the inner wall of the suction tube, affecting the transparency of the suction tube, making it inconvenient to observe the flow of the sputum, and thus being unable to see whether the sputum is completely sucked out in time. Secondary suction is likely to occur, causing discomfort to the patient.

[0003] In order to solve the above problems, the present application proposes an anti-reflux suction tube for critically ill patients in the respiratory department. Summary of the Invention

[0004] To solve the problems raised in the above background technology, the present invention provides an anti-reflux suction tube for critically ill patients in the respiratory department, which has the characteristics of preventing sputum from adhering to the inner wall of the suction tube, making it difficult to observe, thereby better observing the flow of sputum, avoiding secondary suctioning, and reducing the pain of patients.

[0005] To achieve the above objectives, the present invention provides the following technical solutions: an anti-reflux suction tube for critically ill patients in a respiratory department, comprising a suction tube body and an air inlet cap disposed on the surface of the end of the suction tube body, wherein a detection component is installed on the suction tube body;

[0006] The detection component includes a plastic tube, a suction joint, a discharge joint, an end A, an end B, a U-shaped tube, a negative pressure control valve A and a negative pressure control valve B, a baffle, a rotating rod, a reset torsion spring and a pointer. The plastic tube is provided on one side of the suction tube body, the suction joint is fixed at one end of the plastic tube, the discharge joint is fixed at the other end of the plastic tube, the end A is fixed on the surface of the suction joint, the end B is fixed on the surface of the discharge joint, the end A and the end B are designed to be in a horizontal plane, the U-shaped tube is provided between the end A and the end B, and the two ends of the U-shaped tube are respectively plugged into the end A and the end B. At the end of the end B, the surface of the U-shaped tube is provided with the negative pressure control valve A, and the surface of the sputum discharge joint is provided with the negative pressure control valve B. The negative pressure control valve B is located between the plastic tube and the end B. The baffle is provided inside the plastic tube, and the rotating rod is fixed on the upper surface of the baffle. The rotating rod passes through the inside of the plastic tube and extends to the outside of the plastic tube, and is rotatably connected to the plastic tube through a bearing, and is fixedly connected to the pointer on the outside of the plastic tube. The surface of the rotating rod is sleeved with the reset torsion spring, and the two torsion arms of the reset torsion spring are respectively stuck in the rotating rod and the plastic tube.

[0007] As a preferred anti-reflux suction tube for critically ill patients in the respiratory department of the present invention, the baffle is designed in a semicircular structure, the rotating rod is fixed on the left side of the upper surface of the baffle, and the baffle is in an inclined structure relative to the plastic tube in the initial state, and the baffle is inclined away from the rotating rod and approaches the suction tube body at an angle.

[0008] As a preferred anti-reflux suction tube for critically ill patients in the respiratory department of the present invention, a convex lens is fixed to the surface of the plastic tube near the pointer, and a movable cavity adapted to the pointer is provided inside the convex lens.

[0009] As a preferred anti-reflux suction tube for critically ill patients in the respiratory department of the present invention, the plastic tube, suction joint and discharge joint are divided into two from top to bottom and are symmetrically arranged, and a card strip and a card slot are respectively provided on the side close to each other.

[0010] As a preferred anti-reflux suction tube for critically ill patients in the respiratory department of the present invention, the detection component also includes an annular groove and a rubber locking ring. Two groups of symmetrically arranged annular grooves are provided on the surface of the plastic tube, and the annular grooves are located on both sides of the convex lens. The rubber locking ring is provided on the side of the plastic tube surface close to the annular groove.

[0011] As a preferred embodiment of the anti-reflux suction tube for critically ill patients in the respiratory department of the present invention, the height of the rubber locking ring is greater than the height of the convex lens.

[0012] As a preferred anti-reflux suction tube for critically ill patients in the respiratory department of the present invention, an annular groove is provided on the inner side wall of the suction connector near the end A, and an annular card is provided inside the annular groove.

[0013] As a preferred embodiment of the anti-reflux suction tube for critically ill patients in the respiratory department of the present invention, the annular card is located between the end A and the plastic tube.

[0014] Compared with the prior art, the beneficial effects of the present invention are: by setting up a detection component, the swing of the pointer can be used to observe whether the sputum is completely sucked out, avoiding the sputum adhering to the inner wall of the suction tube, which is difficult to observe, thereby better observing the flow of sputum, avoiding secondary suctioning, and reducing the patient's pain. At the same time, the swing amplitude of the pointer can be used to see whether the suction tube body is completely blocked, meeting actual usage needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0016] Figure 1 It is a schematic structural diagram of the present invention as a whole;

[0017] Figure 2 It is a partial cross-sectional view of the overall structure of the present invention;

[0018] Figure 3 This is a cross-sectional view of the structure of the plastic tube and the sputum suction joint connector in the present invention;

[0019] Figure 4 This is a schematic structural diagram of the connecting parts such as the pointer and the U-shaped tube in the present invention;

[0020] Figure 5 This is an expanded diagram of the structure of the detection component in the present invention;

[0021] Figure 6 This is a cross-sectional view of the structure of the plastic pipe in the present invention;

[0022] Figure 7 For the present invention Figure 6 A schematic diagram of the enlarged structure at point A;

[0023] In the picture:

[0024] 1. Suction tube body;

[0025] 2. Air intake cap;

[0026] 3. Detection assembly; 31. Plastic tube; 32. Suction connector; 33. Discharge connector; 34. Terminal A; 35. Terminal B; 36. U-shaped tube; 37. Negative pressure control valve A; 38. Negative pressure control valve B; 39. Baffle; 311. Rotating rod; 312. Reset torsion spring; 313. Pointer;

[0027] 41. Convex lens;

[0028] 51. annular groove; 52. rubber locking ring;

[0029] 61. Annular card slot; 62. Annular card. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0031] Example 1

[0032] like Figure 1-7 As shown:

[0033] An anti-reflux sputum suction tube for critically ill patients in the respiratory department, comprising a sputum suction tube body 1 and an air inlet cap 2 arranged on the end surface of the sputum suction tube body 1, and a detection component 3 is installed on the sputum suction tube body 1;

[0034] The detection component 3 includes a plastic tube 31, a suction joint 32, a discharge joint 33, an end A34, an end B35, a U-shaped tube 36, a negative pressure control valve A37, a negative pressure control valve B38, a baffle 39, a rotating rod 311, a reset torsion spring 312 and a pointer 313. A plastic tube 31 is provided on one side of the suction tube body 1. A suction joint 32 is fixed to one end of the plastic tube 31, and a discharge joint 33 is fixed to the other end of the plastic tube 31. The surface of the suction joint 32 is fixed with an end A34, and the surface of the discharge joint 33 is fixed with an end B35. The end A34 and the end B35 are designed in a horizontal plane. A U-shaped tube 36 is provided between the end A34 and the end B35, and the two ends of the U-shaped tube 36 are respectively inserted Connected to the ends of the end A34 and the end B35, a negative pressure control valve A37 is provided on the surface of the U-shaped tube 36, and a negative pressure control valve B38 is provided on the surface of the sputum discharge joint 33. The negative pressure control valve B38 is located between the plastic tube 31 and the end B35. A baffle 39 is provided inside the plastic tube 31, and a rotating rod 311 is fixed on the upper surface of the baffle 39. The rotating rod 311 passes through the inside of the plastic tube 31 and extends to the outside of the plastic tube 31. It is rotatably connected to the plastic tube 31 through a bearing and is fixedly connected to the pointer 313 on the outside of the plastic tube 31. A reset torsion spring 312 is provided on the surface of the rotating rod 311, and the two torsion arms of the reset torsion spring 312 are respectively clamped in the rotating rod 311 and the plastic tube 31.

[0035] In this embodiment: Currently, the color of sputum produced varies with the different symptoms of the patient. For some lung cancer, tuberculosis, bronchiectasis, etc., this kind of sputum may appear, and the sputum may appear red, brown, or yellow. When the sputum is sucked into the suction tube, the sputum is likely to adhere to the inner wall of the suction tube, affecting the transparency of the suction tube, making it inconvenient to observe the flow of the sputum, and thus being unable to see in time whether the sputum is completely sucked out. Secondary suction is likely to occur, causing discomfort to the patient.

[0036] The present invention provides an anti-reflux sputum suction tube. When in use, first connect the sputum discharge connector 33 to the sputum inlet tube of the sputum suction device (not shown in the figure), adjust the vacuum pressure of the sputum suction device, then connect the sputum suction device to the power supply and start it, and then adjust the negative pressure control valve A37 and the negative pressure control valve B38 respectively to appropriate values ​​so that the negative pressure inside the U-shaped tube 36 is greater than the negative pressure inside the plastic tube 31, thereby making the suction force of the U-shaped tube 36 greater than the suction force inside the plastic tube 31. In this process, the suction force generated by the sputum suction device drives the baffle 39 to swing at an angle, and at the same time drives the reset torsion spring 312 to deform. , so that the baffle 39 and the plastic tube 31 are in a horizontal state. Since the inlet of the air inlet cap 2 is larger than the air inlet at one end of the sputum suction tube body 1, and the negative pressure of the air inlet cap 2 is greater than the negative pressure generated by the sputum suction device, the suction force generated by the sputum suction device is sucked in through the air inlet cap 2, and then the sputum suction tube body 1 is deeply inserted into the patient's sputum suction position. Then, the air inlet cap 2 is pressed by the finger, and the sputum suction tube body 1 is rotated to suck the sputum. After the sputum is discharged to the position of the annular card 62 through the sputum suction tube body 1, the negative pressure inside the U-shaped tube 36 is greater than the negative pressure inside the plastic tube 31. At this time, the sputum will enter along with the end A34 The sputum is sucked into the U-shaped tube 36. Since the U-shaped tube 36 is a U-shaped structure, it can achieve a certain sputum anti-reflux effect. When the sputum is discharged to the sputum discharge joint 33 along with the end B35, the blocking area in the sputum discharge joint 33 is reduced, so that the negative pressure inside the plastic tube 31 is reduced. At this time, the reset torsion spring 312 drives the baffle 39 to swing at the reset angle. As the baffle 39 swings, the rotating rod 311 is driven to rotate, and the pointer 313 is driven to swing to the right by the rotating rod 311. By observing the rightward swing of the pointer 313, it is judged whether there is sputum sucked in. When there is no sputum, the discharge The blocking area inside the sputum joint 33 increases, the negative pressure inside the plastic tube 31 increases, the suction force increases, and then drives the baffle 39 to swing to the left, and drives the pointer 313 to swing to the left through the baffle 39. In this case, no sputum is sucked in. When the pointer 313 swings to the left with a large amplitude, it indicates that the sputum tube body 1 may be blocked by sputum, thereby avoiding sputum adhering to the inner wall of the suction tube, which is difficult to observe, thereby better observing the flow of sputum, avoiding secondary suction, and reducing patient pain. At the same time, the swing amplitude of the pointer 313 can be used to see whether the suction tube body is completely blocked, meeting actual usage needs.

[0037] Further,

[0038] In an optional embodiment, the baffle 39 is designed in a semicircular structure, and the rotating rod 311 is fixed on the left side of the upper surface of the baffle 39. In the initial state, the baffle 39 is in an inclined structure design relative to the plastic tube 31, and the baffle 39 is inclined at an angle away from the rotating rod 311 toward the suction tube body 1.

[0039] In this embodiment: Since the baffle 39 is a semicircular structure, a certain amount of air flow can be achieved. When there is sputum inside the U-shaped tube 36, the gas enters the plastic tube 31 through the suction tube body 1, thereby improving the suction efficiency. The rotating rod 311 is fixed to the left side of the upper surface of the baffle 39, so that the baffle 39 is in a non-center-of-gravity position. At the same time, under the gravity of the baffle 39 itself, the swing angle of the baffle 39 due to the suction force is larger. In the initial state, the baffle 39 is in an inclined state relative to the plastic tube 31, and the baffle 39 is inclined at an angle away from the rotating rod 311, and is close to the suction tube body 1. This is to better drive the baffle 39 to swing at an angle when suction is generated.

[0040] Further,

[0041] In an optional embodiment, a convex lens 41 is fixed on the surface of the plastic tube 31 near the pointer 313 , and a movable cavity adapted to the pointer 313 is provided inside the convex lens 41 .

[0042] In this embodiment: the raised surface of the convex lens 41 can refract light. When looking at the pointer 313 through the convex lens 41, the light will be reflected from the object to our eyes. After being refracted by the lens, it becomes larger and clearer, and the swing of the pointer 313 can be better observed. Since the pointer 313 is designed to be smaller, it is lighter, which reduces the total weight of the baffle 39 and avoids a small swing amplitude of the baffle 39.

[0043] It should be noted that an angle rotation marking line is provided on the surface of the plastic tube 31 near the pointer 313 , so that the rotation of the pointer 313 can be better observed.

[0044] Further,

[0045] In an optional embodiment, the plastic tube 31, the sputum suction connector 32 and the sputum discharge connector 33 are divided into two parts from top to bottom and are symmetrically arranged, and a card strip and a card slot are respectively provided on the sides close to each other.

[0046] The detection component 3 also includes an annular groove 51 and a rubber locking ring 52. Two groups of symmetrically arranged annular grooves 51 are opened on the surface of the plastic tube 31, and the annular grooves 51 are located on both sides of the convex lens 41. A rubber locking ring 52 is provided on the side of the surface of the plastic tube 31 close to the annular groove 51.

[0047] In this embodiment: since the plastic tube 31, the suction joint 32 and the discharge joint 33 are divided into two from top to bottom, it is convenient to disassemble the plastic tube 31, the suction joint 32 and the discharge joint 33, which is convenient for later disinfection and can be reused, saving cost consumption. The plastic tube 31, the suction joint 32 and the discharge joint 33 can be installed and closed through the card strip and the card slot, and the sealing effect is better. At the same time, the rubber locking ring 52 is sleeved in the annular groove 51 opened in the plastic tube 31, so that the elastic tension of the rubber locking ring 52 tightens the plastic tube 31. At the same time, the suction joint 32 is sleeved by the suction tube body 1 and the discharge joint 33 is sleeved by the suction device connecting pipe to tighten and fix the suction joint 32 and the discharge joint 33.

[0048] Further,

[0049] In an optional embodiment, the height of the rubber locking ring 52 is greater than the height of the convex lens 41 .

[0050] In this embodiment, the height of the rubber lock ring 52 is higher than that of the convex lens 41 , and can protect the convex lens 41 and prevent the surface of the convex lens 41 from being scratched, which would affect the use effect of the convex lens 41 .

[0051] Further,

[0052] In an optional embodiment, an annular groove 61 is provided on the inner side wall of the sputum suction connector 32 near the end A34 , and an annular card 62 is provided inside the annular groove 61 .

[0053] The ring card 62 is located between the end A34 and the plastic tube 31.

[0054] In this embodiment: after the sputum is discharged to the position of the annular card 62 through the suction tube body 1, the sputum is exactly located at the end A34. Since the annular card 62 can generate a certain resistance to the sputum, it blocks the sputum and increases the suction buffer time period of the suction port at the end A34. At this time, the negative pressure inside the U-shaped tube 36 is greater than the negative pressure inside the plastic tube 31. At this time, the sputum will enter the interior of the U-shaped tube 36 along the end A34.

[0055] The working principle and use process of the present invention: When using the anti-reflux suction tube for critically ill patients in the respiratory department, first connect the sputum discharge connector 33 to the sputum inlet tube of the sputum suction device (not shown in the figure), adjust the vacuum pressure of the sputum suction device, then connect the sputum suction device to the power supply and start it, and then adjust the negative pressure control valve A37 and the negative pressure control valve B38 respectively to appropriate values, so that the negative pressure inside the U-shaped tube 36 is greater than the negative pressure inside the plastic tube 31, so that the suction force of the U-shaped tube 36 is greater than the suction force inside the plastic tube 31. In this process, the suction force generated by the sputum suction device drives the baffle 39 to swing at an angle, and at the same time drives the reset torsion spring 312 to deform, so that the baffle 39 and the plastic tube 31 are in a horizontal state. Since the inlet of the air inlet cap 2 is larger than the main body of the sputum suction tube 1, and the negative pressure of the air inlet cap 2 is greater than the negative pressure generated by the sputum suction device. Then the suction force generated by the sputum suction device is sucked in through the air inlet cap 2, and then the sputum suction tube body 1 is deepened into the patient's sputum suction position. Then, the air inlet cap 2 is pressed by the fingers, and the sputum suction tube body 1 is rotated to suck the sputum. After the sputum passes through the sputum suction tube body 1 and is discharged to the position of the annular card 62, the sputum is just at the position of the end A34. Since the annular card 62 can generate a certain resistance to the sputum, it blocks the sputum and increases the sputum suction buffer time period for the sputum suction port at the position of the end A34. At this time, the negative pressure inside the U-shaped tube 36 is greater than the negative pressure inside the plastic tube 31. At this time, the sputum will enter the interior of the U-shaped tube 36 along with the end A34. It has a U-shaped structure, which can achieve a certain sputum anti-reflux effect. When the sputum is discharged to the sputum discharge joint 33 along with the end B35, the blocking area in the sputum discharge joint 33 is reduced, so that the negative pressure inside the plastic tube 31 is reduced. At this time, the reset torsion spring 312 drives the baffle 39 to swing at the reset angle. As the baffle 39 swings, the rotating rod 311 is driven to rotate, and the rotating rod 311 drives the pointer 313 to swing to the right. By observing the rightward swing of the pointer 313, it is judged whether sputum is sucked in. When there is no sputum, the blocking area inside the sputum discharge joint 33 increases, the negative pressure inside the plastic tube 31 increases, and the suction force is enhanced, thereby driving the baffle 39 to swing to the left, and driving the pointer 313 to swing to the left through the baffle 39. In this case, there is no sputum. Inhalation, when the pointer 313 swings to the left with a large amplitude, it indicates that the sputum tube body 1 may be blocked by sputum, thereby avoiding sputum adhering to the inner wall of the suction tube, which is difficult to observe, thereby better observing the flow of sputum, avoiding secondary suction, and reducing patient pain. At the same time, the swing amplitude of the pointer 313 can be used to see whether the suction tube body is completely blocked, meeting actual use needs. In this process, the convex surface of the convex lens 41 can refract light. When looking at the pointer 313 through the convex lens 41, the light will be reflected from the object to our eyes. After refraction of the lens, it becomes larger and clearer, and the swing of the pointer 313 can be better observed. Since the plastic tube 31, the suction joint 32 and the sputum discharge joint 33 are divided into two from top to bottom,Therefore, it is convenient to disassemble the plastic tube 31, the suction joint 32 and the discharge joint 33, and it is convenient to disinfect them later. They can be reused, saving costs. The card strips and card slots can make the plastic tube 31, the suction joint 32 and the discharge joint 33 have a better sealing effect during the installation and closing process. At the same time, the rubber locking ring 52 is sleeved in the annular groove 51 opened in the plastic tube 31, so that the elastic tension of the rubber locking ring 52 tightens the plastic tube 31. At the same time, the suction joint 32 is sleeved by the suction tube body 1 and the discharge joint 33 is sleeved by the suction device connecting tube to tighten and fix the suction joint 32 and the discharge joint 33. At the same time, the height of the rubber locking ring 52 is higher than the height of the convex lens 41, which can protect the convex lens 41 and avoid scratches on the surface of the convex lens 41, which affects the use effect of the convex lens 41.

[0056] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An anti-reflux sputum suction tube for critically ill patients in the respiratory department, comprising a sputum suction tube body (1) and an air inlet cap (2) arranged on the end surface of the sputum suction tube body (1), characterized in that: A detection component (3) is installed on the sputum suction tube body (1); The detection component (3) comprises a plastic tube (31), a sputum suction connector (32), a sputum discharge connector (33), an end A (34), an end B (35), a U-shaped tube (36), a negative pressure control valve A (37), a negative pressure control valve B (38), a baffle (39), a rotating rod (311), a reset torsion spring (312) and a pointer (313). The plastic tube (31) is provided on one side of the sputum suction tube body (1), and the sputum suction connector is fixed at one end of the plastic tube (31). The plastic tube (31) is fixed with the sputum discharge connector (33) at the other end, the surface of the sputum suction connector (32) is fixed with the end head A (34), the surface of the sputum discharge connector (33) is fixed with the end head B (35), the end head A (34) and the end head B (35) are designed to be horizontal, and the U-shaped tube (36) is provided between the end head A (34) and the end head B (35), and the two ends of the U-shaped tube (36) are respectively plugged into the At the ends of the end A (34) and the end B (35), the surface of the U-shaped tube (36) is provided with the negative pressure control valve A (37), and the surface of the sputum discharge connector (33) is provided with the negative pressure control valve B (38). The negative pressure control valve B (38) is located between the plastic tube (31) and the end B (35). The baffle (39) is provided inside the plastic tube (31). The upper surface of the baffle (39) is fixed with the rotating rod (311). The rotating rod (311) passes through the inside of the plastic tube (31) and extends to the outside of the plastic tube (31). It is rotatably connected to the plastic tube (31) through a bearing and is fixedly connected to the pointer (313) outside the plastic tube (31). The surface of the rotating rod (311) is provided with the reset torsion spring (312). The two torsion arms of the reset torsion spring (312) are respectively engaged with the rotating rod (311) and the plastic tube (31). The baffle (39) is designed to have a semicircular structure, the rotating rod (311) is fixed to the left side of the upper surface of the baffle (39), the baffle (39) is in an inclined structure relative to the plastic tube (31) in an initial state, and the baffle (39) is inclined at an angle away from the rotating rod (311) toward the suction tube body (1); A convex lens (41) is fixed on the surface of the plastic tube (31) at a side close to the pointer (313), and a movable cavity adapted to the pointer (313) is provided inside the convex lens (41).

2. The anti-reflux suction tube for critically ill patients in the respiratory department according to claim 1, characterized in that: The plastic tube (31), the sputum suction connector (32) and the sputum discharge connector (33) are divided into two parts from top to bottom and are symmetrically arranged, and a clamping strip and a clamping slot are respectively provided on the sides close to each other.

3. The anti-reflux suction tube for critically ill patients in the respiratory department according to claim 2, characterized in that: The detection assembly (3) further comprises an annular groove (51) and a rubber locking ring (52). The surface of the plastic tube (31) is provided with two groups of symmetrically arranged annular grooves (51), and the annular grooves (51) are located on both sides of the convex lens (41). The rubber locking ring (52) is sleeved on the side of the surface of the plastic tube (31) close to the annular grooves (51).

4. The anti-reflux suction tube for critically ill patients in the respiratory department according to claim 3, characterized in that: The height of the rubber locking ring (52) is greater than the height of the convex lens (41).

5. The anti-reflux suction tube for critically ill patients in the respiratory department according to claim 4, characterized in that: An annular card slot (61) is provided on the inner side wall of the sputum suction connector (32) near the end A (34), and an annular card (62) is provided inside the annular card slot (61).

6. The anti-reflux suction tube for critically ill respiratory patients according to claim 5, characterized in that: The annular card (62) is located between the end A (34) and the plastic tube (31).

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