Sputum suction connecting pipe

Abstract

The invention discloses a sputum suction connecting tube, and relates to the technical field of medical instruments, in particular to a sputum suction connecting tube which comprises an inner tube, the sputum suction end of the inner tube is slidably sleeved with an outer tube, the front end of the inner tube is wrapped with a buffer layer, and an air cavity is formed between the buffer layer and the inner tube. A negative pressure moving ring capable of moving inwards through negative pressure is arranged on the inner wall of the sputum suction end of the inner tube, and an air bag capable of inflating the air cavity is arranged on the inner side, close to the negative pressure moving ring, of the inner wall of the sputum suction end of the inner tube. The covering cylinder at the end part of the outer tube is flexibly propped against the buffer layer at the front end of the inner tube, so that when the outer tube carries the covering cylinder to enter the upper respiratory tract in advance and is fixed at a preset position, the inner tube can be independently pushed forwards to go deep into the lower respiratory tract, and colonized florae in the upper respiratory tract are effectively prevented from invading the lower respiratory tract along with the sputum suction tube by utilizing the physical isolation effect of the outer tube; the iatrogenic pulmonary infection risk is reduced.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more specifically, to a suction connecting tube. Background Technology

[0002] In clinical respiratory management, suction catheters, as core sterile medical devices for negative pressure drainage, function primarily to create a closed pathway from the airway to the negative pressure suction device. Through a one-piece molding design using medical-grade polymer materials (such as silicone and PVC), the functions of traditional suction catheters and connecting tubes are integrated into a single tube, combining the flexibility of the suction end with the stability of the negative pressure transmission end. When patients experience weak coughing and airway secretion retention due to postoperative anesthesia, neuromuscular diseases, altered consciousness, or severe infection, sputum retention can lead to risks such as ventilation dysfunction, atelectasis, and aspiration pneumonia. Suction catheters, with one end penetrating deep into the airway to clear secretions and the other end directly connecting to the negative pressure suction machine, become a crucial component for maintaining airway patency. Existing suction catheters mostly employ a one-piece molding process using medical-grade polymer materials, combining biocompatibility and mechanical properties. Their front end design conforms to the human airway anatomy, while the rear end is equipped with a standardized interface to adapt to different models of negative pressure devices.

[0003] For example, the integrated suction tube and connecting tube structure with application number CN202321815956.8 and the pediatric suction tube with application number CN202021617481.8 are both improvements on the integrated suction connecting tube. However, existing integrated suction catheters present a significant risk of infection during clinical procedures: According to the "Guidelines for Clinical Respiratory Management," suctioning should follow the "lower tract first, then upper tract" principle, meaning that sputum should be cleared from the lower respiratory tract first, and then the catheter should be withdrawn to clear the upper respiratory tract, in order to prevent upper respiratory tract pathogens from regressing into the lower respiratory tract. However, in existing technologies, the single-tube structure of integrated suction catheters inevitably requires passage through the upper respiratory tract into the airway when performing lower respiratory tract suctioning. This process carries upper respiratory tract colonizing flora (such as oropharyngeal opportunistic pathogens) into the originally relatively sterile lower respiratory tract.

[0004] From the perspective of respiratory anatomy and physiology, the lower respiratory tract maintains a sterile environment through the ciliary mucus barrier and immune defense mechanisms. However, when the surface of the integrated suction catheter passes through the upper respiratory tract, a biofilm-like colonization forms. When the catheter extends into the lower respiratory tract areas such as bronchial bifurcation, the colonizing bacteria can break through the mucus barrier, directly leading to an increased risk of iatrogenic pulmonary infection. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a suction connecting tube that solves the problems mentioned in the background section.

[0006] The technical solution of this invention is as follows: To achieve the above objectives, the present invention provides the following technical solution: a suction connecting tube, comprising an inner tube, an outer tube slidably fitted at the suction end of the inner tube, a buffer layer wrapped around the front end of the inner tube, and an air cavity formed between the buffer layer and the inner tube, a negative pressure moving ring that can move inward under negative pressure is provided on the inner wall of the suction end of the inner tube, and an air bladder that can inflate the air cavity is provided on the inner side of the inner wall of the suction end of the inner tube near the inner side of the negative pressure moving ring, and the movement of the negative pressure moving ring can provide the air bladder with the force of being squeezed, a negative pressure plate that can be opened by negative pressure is provided on the inner circumferential surface of the negative pressure moving ring, a guide tube is fixedly connected to the outer side of the negative pressure moving ring, a first annular groove is opened on the inner circumferential surface of the suction end of the inner tube near the outer side of the negative pressure moving ring, and the end of the guide tube away from the negative pressure moving ring is fixedly connected in the first annular groove.

[0007] Preferably, the outer tube is fixedly connected to a covering tube that can completely cover the buffer layer at one end near the suction end of the inner tube, and a limiting groove is provided on the inner wall of the outer tube at one end near the covering tube, and a guide limiting ring adapted to the limiting groove is fixedly connected to the outer peripheral surface of the suction end of the inner tube.

[0008] Preferably, the negative pressure plate is slidably connected to the inner circumferential surface of the negative pressure moving ring, and an auxiliary plate is fixedly connected to the outer circumferential surface of the negative pressure plate near the guide limiting ring. A plurality of tension springs, each with one end fixedly mounted on the negative pressure moving ring, are fixedly connected to the side of the auxiliary plate away from the guide limiting ring.

[0009] Preferably, a second annular groove is formed on the inner wall of the suction end of the inner tube near the inner side of the negative pressure moving ring. A driven cylinder is fixedly connected to the inner side of the negative pressure moving ring, and the outer circumferential surface of the driven cylinder is attached to the inner circumferential surface of the inner tube, and the driven cylinder can completely cover the second annular groove. A driven ring plate with its outer circumferential surface abutting against the inner circumferential surface of the second annular groove is fixedly connected to the outer circumferential surface of the driven cylinder. A spring is fixedly connected to the side of the second annular groove away from the guide cylinder, and the end of the spring near the guide cylinder is fixedly connected to the driven ring plate.

[0010] Preferably, a plurality of airbags are uniformly fixedly connected in the second annular groove, with one end of the airbag near the driven annular plate fixedly connected to the driven annular plate, and a plurality of communicating components capable of communicating with the air cavity are fixedly installed on the side of the driven annular plate away from the airbag.

[0011] Preferably, the connecting component includes a plurality of second connecting ports that pass through the driven ring plate and the air bladder in sequence. A plurality of connecting hoses adapted to and connected to the second connecting ports are fixedly connected to the side of the driven ring plate away from the air bladder. A plurality of first connecting ports that are connected to the second ring groove are evenly opened on the outer circumferential surface of the suction end of the inner tube. The end of each connecting hose away from the driven ring plate is fixedly connected to the side wall of the second ring groove and connected to the corresponding first connecting port.

[0012] Preferably, a retaining ring is fixedly connected to the side of the first annular groove away from the negative pressure moving ring.

[0013] Preferably, the outer peripheral surface of the buffer layer is provided with air grooves.

[0014] Beneficial effects This invention provides a suction tube with the following advantages: 1. This suction tube, through its sliding sleeve structure between the outer and inner tubes and the flexible contact between the outer tube end cover and the inner tube front buffer layer, allows the inner tube to be pushed forward into the lower respiratory tract independently after the outer tube carrying the cover has entered the upper respiratory tract and been fixed in the predetermined position. Utilizing the physical isolation effect of the outer tube, it effectively prevents colonizing bacteria in the upper respiratory tract from invading the lower respiratory tract along with the suction tube, reducing the risk of iatrogenic pulmonary infection. At the same time, the flexible latex surface of the cover and buffer layer can disperse the mechanical pressure on the airway mucosa through elastic deformation during the insertion, withdrawal, and retention of the outer and inner tubes, avoiding direct friction damage to the mucosa from the hard tube wall, and significantly improving the patient's operational tolerance and comfort.

[0015] 2. This suction tube, through the linkage inflation structure of the cuff, driven ring plate, and buffer layer air chamber, and the setting of air grooves on the outer peripheral surface of the buffer layer, when the negative pressure drives the negative pressure moving ring to squeeze the cuff, oxygen in the cuff is injected into the air chamber through the connecting hose and the first connecting port, causing the buffer layer to expand evenly and fit tightly against the inner wall of the trachea, forming a locally sealed drainage space, reducing radial leakage of negative pressure energy, and enhancing the adsorption efficiency of deep sputum; at the same time, the presence of air grooves can maintain airway ventilation gaps when the buffer layer expands, avoiding complete closure of the airway, and continuously ensuring the patient's basic ventilation function. Combined with the clinical standard that the single suction time should not exceed 15 seconds, it achieves dual optimization of sputum clearance efficiency and respiratory safety. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a partial cross-sectional structural diagram of the outer tube and inner tube fitting together according to the present invention; Figure 3 For the present invention Figure 2 Enlarged structural diagram at point A; Figure 4 This is a schematic diagram of the cooperation structure of the spring, driven ring plate and airbag of the present invention; Figure 5 This is a schematic diagram of the combined structure of the buffer layer and the air groove of the present invention.

[0017] In the diagram: 1. Outer tube; 2. Inner tube; 3. Covering cylinder; 4. Buffer layer; 5. Negative pressure plate; 6. Guide flexible cylinder; 7. Retaining ring; 8. First annular groove; 9. First connecting port; 10. Spring; 11. Driven ring plate; 12. Connecting flexible hose; 13. Tension spring; 14. Auxiliary plate; 15. Guide limiting ring; 16. Second connecting port; 17. Air groove; 18. Negative pressure moving ring; 19. Second annular groove; 20. Airbag; 21. Driven cylinder. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1 In existing suctioning techniques, traditional suctioning procedures typically use a single suction catheter to suction sputum from the lower respiratory tract to the upper respiratory tract sequentially. However, this procedure carries significant clinical risks: First, as the suction catheter travels from the upper respiratory tract into the lower respiratory tract, it inevitably carries with it the colonizing flora of the upper respiratory tract (such as normal flora or opportunistic pathogens from the oropharynx). According to respiratory anatomy, the lower respiratory tract is normally a relatively sterile environment. Pathogens entering through the suction catheter can disrupt the biological barrier of the lower respiratory tract, increasing the risk of iatrogenic pulmonary infection. Second, repeated insertion and removal of the suction catheter causes continuous friction between its rigid walls and the upper respiratory tract mucosa. This mechanical stimulation can damage the integrity of the respiratory mucosa, leading to damage to mucosal epithelial cells and increased capillary permeability. This not only causes pain and discomfort for the patient but also exacerbates susceptibility to infection due to weakened mucosal barrier function. To address these issues, this embodiment has been invented.

[0020] Please see Figures 1 to 5This invention provides a technical solution: a suction connecting tube, including an inner tube 2, with an outer tube 1 slidably fitted onto the suction end of the inner tube 2, wherein the outer tube 1 can rotate and slide on the inner tube 2, the front end of the inner tube 2 is wrapped with a buffer layer 4, and an air cavity is formed between the buffer layer 4 and the inner tube 2, wherein the buffer layer 4 is made of latex, the inner wall of the suction end of the inner tube 2 is provided with a negative pressure moving ring 18 that can move into the inner tube 2 by negative pressure, and an air bag 20 that can inflate into the air cavity is provided on the inner side of the inner wall of the suction end of the inner tube 2 near the inner side of the negative pressure moving ring 18, wherein the air bag 20 is pre-filled with oxygen, and the movement of the negative pressure moving ring 18 can provide the air bag 20 with the force of compression, the inner circumferential surface of the negative pressure moving ring 18 is provided with a negative pressure plate 5 that can be opened by negative pressure, and the outer side of the negative pressure moving ring 18 is fixedly connected to The device includes a guide tube 6, inside which are evenly distributed several elastic corrugated plates made of medical-grade silicone. When the negative pressure moving ring 18 moves axially along the inner tube 2, the elastic corrugated plates are stretched, causing the guide tube 6 to unfold into a cylindrical shape. After the negative pressure moving ring 18 is reset, the high elasticity and memory properties of the silicone material drive the corrugated plates to quickly return to their initial corrugated structure, thereby causing the guide tube 6 to synchronously complete its shape restoration. A first annular groove 8 is provided on the outer side of the suction end of the inner tube 2 near the negative pressure moving ring 18, and the end of the guide tube 6 away from the negative pressure moving ring 18 is fixedly connected to the first annular groove 8. A retaining ring 7 is fixedly connected to the side of the first annular groove 8 away from the negative pressure moving ring 18. The retaining ring 7 is designed to prevent sputum adhering to the inner surface of the guide tube 6 from flowing back into the human airway.

[0021] Please see Figures 2 to 4 The outer tube 1 is fixedly connected to a cover tube 3 that can completely cover the buffer layer 4 at the end near the suction end of the inner tube 2. The material of the cover tube 3 is the same as that of the buffer layer 4, which is latex. A limiting groove is opened on the inner wall of the outer tube 1 near the end of the cover tube 3. A guide limiting ring 15 that matches the limiting groove is fixedly connected to the outer circumferential surface of the suction end of the inner tube 2. Therefore, when the suction end of the inner tube 2 is fully retracted into the outer tube 1, the buffer layer 4 and the covering tube 3 form a flexible contact structure. During clinical operation, the outer tube 1 contacts the patient's airway wall through the latex outer surface of the covering tube 3. Utilizing the flexible buffering properties of the latex material, the mechanical stimulation of the airway mucosa during suctioning can be effectively reduced. At the same time, the oxygen pre-filled in the airway can be evenly distributed through the buffer layer 4 to avoid direct pressure on the pharynx and airway mucosa by the tip of the outer tube 1, significantly reducing the risk of damage such as mucosal bleeding and edema caused by local friction, and improving the safety and comfort of the suctioning operation.

[0022] Please see Figures 2 to 4The negative pressure plate 5 is slidably connected to the inner circumferential surface of the negative pressure moving ring 18, and an auxiliary plate 14 is fixedly connected to one end of the outer circumferential surface of the negative pressure plate 5 near the guide limiting ring 15. A plurality of tension springs 13, one end of which is fixedly installed on the negative pressure moving ring 18, are fixedly connected to the side of the auxiliary plate 14 away from the guide limiting ring 15. A third ring groove is provided on the side of the negative pressure moving ring 18 away from the guide limiting ring 15. The end of the tension spring 13 away from the auxiliary plate 14 is fixedly connected to the side wall of the third ring groove. In the initial state, the auxiliary plate 14 is completely hidden in the third ring groove and slides with the groove wall of the third ring groove. A second annular groove 19 is provided on the inner wall of the suction end of the inner tube 2 near the inner side of the negative pressure moving ring 18. A driven cylinder 21 is fixedly connected to the inner side of the negative pressure moving ring 18, and the outer circumferential surface of the driven cylinder 21 is in contact with the inner circumferential surface of the inner tube 2. The driven cylinder 21 can completely cover the second annular groove 19. Therefore, by setting the driven cylinder 21, sputum can be prevented from entering the second annular groove 19. A driven ring plate 11 is fixedly connected to the outer circumferential surface of the driven cylinder 21, and the outer circumferential surface of the driven cylinder 21 abuts against the inner circumferential surface of the second annular groove 19. A spring 10 is fixedly connected to the side of the second annular groove 19 away from the guide soft tube 6. The end of the spring 10 near the guide soft tube 6 is fixedly connected to the driven ring plate 11.

[0023] Since the elastic potential energy of the tension spring 13 is greater than that of the spring 10, when the negative pressure acts on the negative pressure plate 5 and the negative pressure moving ring 18, the negative pressure drives the negative pressure moving ring 18 and the negative pressure plate 5 to move together into the inner cavity of the inner tube 2. During this movement, the negative pressure moving ring 18 drives the driven cylinder 21 and the driven ring plate 11 to move axially synchronously. When the negative pressure moving ring 18 moves to the maximum stroke position, the guide soft cylinder 6 is fully extended. If the negative pressure persists, the negative pressure plate 5 will overcome the tension of the tension spring 13 and slide axially away from the negative pressure moving ring 18 along the inner tube 2. The auxiliary plate 14 will stretch the tension spring 13 and release the negative pressure plate 5 from obstructing the third annular groove, opening the sputum suction channel formed by the third annular groove, thus enabling sputum to be sucked into the inner cavity of the inner tube 2 through the third annular groove. Furthermore, when the driven ring plate 11 moves into the inner tube 2 following the negative pressure moving ring 18, the spring 10 is compressed and stores energy. Therefore, when the negative pressure disappears, the spring 10 releases its elastic potential energy, driving the driven ring plate 11, the connecting hose 12, and the negative pressure moving ring 18 to synchronously reset to their initial state. Similarly, when the negative pressure disappears, the tension spring 13 releases its elastic potential energy, driving the negative pressure plate 5 to return to its original position along the negative pressure moving ring 18, thus re-blocking the third ring groove and closing the sputum aspiration channel. Through the synergistic effect of the negative pressure moving ring 18 and the negative pressure plate 5, the risk of sputum adhering to the inner wall of the inner tube 2 flowing back into the patient's body due to gravity or airflow disturbance after the negative pressure disappears is effectively avoided. Furthermore, through the coordinated design of the outer tube 1 and the inner tube 2, when the suction end of the outer tube 1 passes through the upper respiratory tract and enters the predetermined position (the outer tube 1 has an insertion depth line, which allows medical staff to control the insertion depth of the outer tube 1 based on clinical experience), it stops going deeper into the patient's body. Subsequently, the medical staff pushes the inner tube 2 forward from the outer tube 1, allowing it to be inserted into the lower respiratory tract for suctioning operations alone. This significantly reduces the risk of bacteria in the upper respiratory tract migrating to the lower respiratory tract and causing infection. After the sputum in the lower respiratory tract is suctioned, the medical staff can pull out the inner tube 2 to suction the sputum in the upper respiratory tract. During this process, the design of the outer tube 1 can effectively reduce the friction and irritation of the upper respiratory tract mucosa during suctioning operations, thereby improving the patient's comfort.

[0024] Example 2 The above embodiments, through the arrangement of the outer tube 1 and the inner tube 2, effectively reduce the risk of iatrogenic infection of the lower respiratory tract at the level of physical isolation, and improve the tolerance of the upper respiratory tract mucosa through structural optimization. However, the non-closed annular gap formed between the suction end of the traditional suction catheter and the tracheal wall can cause radial leakage of negative pressure energy during transmission, resulting in a decrease in effective drainage pressure. Combined with the anatomical and physiological characteristics of the respiratory tract, the physiological curvature of the tracheal wall and the adhesion characteristics of secretions, the drainage of deep sputum depends on a stable and concentrated negative pressure traction force. When the gap between the suction end and the tube wall causes the negative pressure to disperse, it will weaken the adsorption efficiency of distal secretions on the one hand, and may increase the risk of mucosal damage due to uneven local pressure on the other hand.

[0025] Please see Figures 1 to 5 Based on the above embodiments, the technical solution adopted includes multiple airbags 20 uniformly fixedly connected in the second annular groove 19. The end of the airbag 20 near the driven ring plate 11 is fixedly connected to the driven ring plate 11. Multiple communicating components that can communicate with the air chamber are fixedly installed on the side of the driven ring plate 11 away from the airbag 20. Therefore, when the negative pressure moving ring 18 drives the driven cylinder 21 and the driven ring plate 11 to move synchronously into the inner tube 2, the driven ring plate 11 exerts a squeezing effect on the airbag 20, causing the oxygen in the airbag 20 to be injected into the air chamber through the communicating components.

[0026] Please see Figures 2 to 4 The connecting component includes a plurality of second connecting ports 16 that pass through the driven ring plate 11 and the airbag 20 in sequence. The number of second connecting ports 16 is the same as that of the airbag 20, and their positions correspond one-to-one. A plurality of connecting hoses 12 that are adapted to and connected to the second connecting ports 16 are fixedly connected to the side of the driven ring plate 11 away from the airbag 20. A plurality of first connecting ports 9 that are connected to the second ring groove 19 are evenly opened on the outer circumferential surface of the suction end of the inner tube 2. The end of each connecting hose 12 away from the driven ring plate 11 is fixedly connected to the side wall of the second ring groove 19 and connected to the corresponding first connecting port 9. Therefore, when the driven ring plate 11 moves into the inner tube 2 following the negative pressure moving ring 18 and squeezes the air bag 20, the oxygen pre-filled in the air bag 20 will be injected into the air chamber through the second connecting port 16 penetrating the driven ring plate 11 and the air bag 20, the connecting hose 12 connected to the driven ring plate 11, and the first connecting port 9 on the outer periphery of the suction end of the inner tube 2. At this time, the buffer layer 4 expands uniformly due to the increase in air pressure in the air chamber, and its outer surface will tightly adhere to the inner wall of the trachea to form a flexible sealing structure. The expansion of the buffer layer 4 disperses local pressure through the elastic deformation of the latex material, avoiding mechanical compression of the airway mucosa. On the other hand, it forms a relatively closed local space during suctioning, reducing the possibility of sputum spreading to other parts or reflux, while enhancing the targeting of negative pressure suction and improving sputum clearance efficiency. At the same time, after the medical staff completes the suctioning operation, the negative pressure system stops working, and the driven ring plate 11 quickly returns to the initial position under the elastic potential energy of the return spring 10. At this time, the oxygen in the buffer layer 4 flows back to the air bag 20, which releases the expansion state of the buffer layer 4 and its outer peripheral surface naturally separates from the tracheal wall, thus providing a smooth operating space for the inner tube 2 and the outer tube 1 to be pulled out.

[0027] Please see Figure 5 The outer peripheral surface of the buffer layer 4 is provided with air grooves 17. The air grooves 17 ensure that the airway will not be completely closed when the buffer layer 4 expands, thereby continuously ensuring the patient's basic ventilation function. At the same time, according to the Clinical Nursing Operation Specifications and respiratory therapy standards, the time for a single suctioning should not exceed 15 seconds.

[0028] In summary, when using this suction tube, medical staff first control the insertion depth by using the depth dimension line of the outer tube 1, so that the suction end of the outer tube 1 reaches the predetermined position through the upper respiratory tract, and the latex flexible surface of the covering tube 3 contacts the airway wall to reduce friction damage to the upper respiratory tract mucosa. The inner tube 2 is then pushed forward from the outer tube 1, allowing its suction end to penetrate deep into the lower respiratory tract. After the negative pressure system is activated, the negative pressure drives the negative pressure moving ring 18 to move into the inner cavity of the inner tube 2, causing the driven ring plate 11 to compress the air bag 20. Oxygen is injected into the air chamber through the connecting hose 12 and the first connecting port 9, causing the buffer layer 4 to expand evenly and form a flexible contact state with the tracheal wall through the air groove 17, which is both sealed and maintains the ventilation channel. When the negative pressure moving ring 18 reaches its maximum stroke, the elastic corrugated plate of the guide tube 6 fully expands. If the negative pressure is maintained, the negative pressure plate 5 overcomes the resistance of the tension spring 13 to open the sputum suction channel, achieving efficient drainage of deep sputum. During operation, the standard of single sputum suction should be strictly followed to avoid prolonged airway closure. After suctioning is completed, the negative pressure disappears, the spring 10 drives the driven ring plate 11 to reset, the oxygen in the buffer layer 4 flows back to the air bag 20, and the outer peripheral surface of the buffer layer 4 separates from the tracheal wall. At this time, the inner tube 2 and the outer tube 1 are pulled out. The cover tube 3 of the outer tube 1 once again plays a flexible protective role, reducing mucosal irritation during the withdrawal process.

[0029] It should be noted that in the description of this invention, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0031] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A suction connecting tube, comprising an inner tube (2), characterized in that: The suction end of the inner tube (2) is slidably fitted with the outer tube (1). The front end of the inner tube (2) is wrapped with a buffer layer (4), and an air cavity is formed between the buffer layer (4) and the inner tube (2). The inner wall of the suction end of the inner tube (2) is provided with a negative pressure moving ring (18) that can move inward by negative pressure. The inner wall of the suction end of the inner tube (2) near the inner side of the negative pressure moving ring (18) is provided with an air bag (20) that can inflate into the air cavity. The movement can provide the airbag (20) with the force of compression. The inner circumferential surface of the negative pressure moving ring (18) is provided with a negative pressure plate (5) that can be opened by negative pressure. The outer side of the negative pressure moving ring (18) is fixedly connected with a guide tube (6). The inner circumferential surface of the suction end of the inner tube (2) is provided with a first ring groove (8) near the outer side of the negative pressure moving ring (18), and the end of the guide tube (6) away from the negative pressure moving ring (18) is fixedly connected in the first ring groove (8).

2. The suction connecting tube according to claim 1, characterized in that: The outer tube (1) is fixedly connected to a covering tube (3) that can completely cover the buffer layer (4) at one end near the suction end of the inner tube (2), and a limiting groove is opened on the inner wall of the outer tube (1) near the covering tube (3). A guide limiting ring (15) that matches the limiting groove is fixedly connected to the outer circumferential surface of the suction end of the inner tube (2).

3. The suction connecting tube according to claim 2, characterized in that: The negative pressure plate (5) is slidably connected to the inner circumferential surface of the negative pressure moving ring (18), and an auxiliary plate (14) is fixedly connected to one end of the outer circumferential surface of the negative pressure plate (5) near the guide limiting ring (15). A plurality of tension springs (13) with one end fixedly installed on the negative pressure moving ring (18) are fixedly connected to the side of the auxiliary plate (14) away from the guide limiting ring (15).

4. The suction connecting tube according to claim 3, characterized in that: The inner wall of the suction end of the inner tube (2) is provided with a second annular groove (19) near the inner side of the negative pressure moving ring (18). The inner side of the negative pressure moving ring (18) is fixedly connected to a driven cylinder (21), and the outer circumferential surface of the driven cylinder (21) is attached to the inner circumferential surface of the inner tube (2). The driven cylinder (21) can completely cover the second annular groove (19). The outer circumferential surface of the driven cylinder (21) is fixedly connected to a driven ring plate (11) whose outer circumferential surface abuts against the inner circumferential surface of the second annular groove (19). The side of the second annular groove (19) away from the guide tube (6) is fixedly connected to a spring (10), and the end of the spring (10) near the guide tube (6) is fixedly connected to the driven ring plate (11).

5. A suction connecting tube according to claim 4, characterized in that: Multiple airbags (20) are uniformly fixedly connected in the second ring groove (19). The end of the airbag (20) near the driven ring plate (11) is fixedly connected to the driven ring plate (11). Multiple communication components that can communicate with the air chamber are fixedly installed on the side of the driven ring plate (11) away from the airbag (20).

6. A suction connecting tube according to claim 5, characterized in that: The connecting component includes a plurality of second connecting ports (16) that pass through the driven ring plate (11) and the air bag (20) in sequence. A plurality of connecting hoses (12) adapted to communicate with the second connecting ports (16) are fixedly connected to the side of the driven ring plate (11) away from the air bag (20). A plurality of first connecting ports (9) communicating with the second ring groove (19) are evenly opened on the outer circumferential surface of the suction end of the inner tube (2). The end of each connecting hose (12) away from the driven ring plate (11) is fixedly connected to the side wall of the second ring groove (19) and communicates with the corresponding first connecting port (9).

7. A suction connecting tube according to claim 6, characterized in that: A retaining ring (7) is fixedly connected to the side of the first annular groove (8) away from the negative pressure moving ring (18).

8. A suction connecting tube according to claim 7, characterized in that: The outer circumferential surface of the buffer layer (4) is provided with air grooves (17).

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