A convenient multi-channel acoustic shield

Abstract

This invention relates to the field of medical device technology, and more particularly to a portable multi-channel glottis. It includes an external cylinder, to which an air guide tube is fixedly connected, and to which a flow guide tube is fixedly connected. An inflation cylinder is fixedly connected to the external cylinder, and the flow guide tube is also fixedly connected to an inflation cylinder. A flow-blocking unit is provided on the inflation cylinder. The flow-blocking unit includes spaced-apart first convex rings, which are connected to the inflation cylinder, and spaced-apart second convex rings are connected to the inflation cylinder. This invention, through the shape design and staggered arrangement of the first and second convex rings, forms several annular cavities with opposite volume changes in the patient's esophagus. When the first and second convex rings are compressed by refluxed gastric juice, the reaction forces provided by adjacent annular cavities after compression have different directions. These different directions of reaction forces can effectively disperse external forces, reduce the deformation of the first and second convex rings, and thus reduce the probability of seal failure.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a convenient multi-channel glottis. Background Technology

[0002] A glottic mask airway (LMA) is a medical device used to maintain a patient's airway patency, and it is widely used, especially in anesthesia and emergency care, due to its ease of installation. A glottic mask typically consists of a mask body, a tubing, and a fixation device. In emergency situations, it is suitable for patients with difficult intubation, providing a rapid ventilation solution. During use, the glottic mask establishes an artificial airway by completely covering the laryngeal airway, closing the esophageal inlet, and draining through a tube (to prevent gastric reflux from affecting the use of the glottic mask).

[0003] While routine clinical practice involves draining gastric contents via a gastric tube before glottic mask airway (GMA) insertion, this method has two limitations: firstly, it's difficult to completely remove gastric juices; secondly, due to the continuous secretion of gastric juices, new gastric juices can accumulate post-operatively. This potential risk is particularly pronounced after GMA insertion. When gastric juices reflux, the accumulated fluids can, under pressure, breach the GMA's sealing structure, triggering airway reflux events. This can lead to serious respiratory damage such as aspiration pneumonia, and in extreme cases, even endanger the patient's life. Summary of the Invention

[0004] To overcome the above-mentioned drawbacks, the present invention provides a convenient multi-channel acoustic shield.

[0005] The technical implementation of the present invention is as follows: a convenient multi-channel glottis includes an external cylinder, an air guide tube fixedly connected to the external cylinder, a support shell fixedly connected to and connected to the air guide tube, a cuff fixedly connected to the support shell, a first inflation tube connected to the cuff, the first inflation tube fixedly connected to the external cylinder, a flow guide tube fixedly connected to the external cylinder, the flow guide tube fixedly connected to the support shell, an inflation cylinder fixedly connected to the flow guide tube, a second inflation tube connected to the inflation cylinder, the second inflation tube fixedly connected to the external cylinder, and a flow-blocking unit for preventing gastric reflux provided on the inflation cylinder;

[0006] The flow-blocking unit includes a first convex ring spaced apart, which is connected to the air cylinder. The air cylinder is connected to a second convex ring spaced apart. Both the first and second convex rings are elastic air bladders. The first and second convex rings are staggered. The flow guide tube is provided with an anti-blocking mechanism to prevent gastric reflux from blocking the flow channel.

[0007] Preferably, both the first convex ring and the second convex ring are ring-shaped structures that gradually bend from the outside to the inside, and both are provided with anti-bending parts at the inner bend, wherein the hardness of the anti-bending parts is greater than that of the other parts.

[0008] Preferably, the anti-clogging mechanism includes a sleeve fixedly connected to the guide tube. The guide tube is slidably connected to a first connecting rope, and the first connecting rope is fixedly connected to a tightening member. The tightening member consists of a rope section and a ring, with the tail end of the rope section connected to the ring section and the head end of the rope section passing through the ring section. The tightening member is located between the guide tube and the sleeve, and the tightening member is fixedly connected to an elastic rope, which is fixedly connected to the sleeve.

[0009] Preferably, a blocking ball is rotatably connected to the portion of the tightening member rope near the tail end, and the blocking ball is larger than the annular portion of the tightening member.

[0010] Preferably, the guide tube is fixedly connected to an anti-backflow sleeve, and the flow area of ​​the anti-backflow sleeve gradually decreases from the side closer to the guide tube to the side farther away from the guide tube.

[0011] Preferably, the anti-backflow sleeve is provided with a flow interception groove.

[0012] Preferably, the device also includes a retrieval mechanism for easy removal of the entire assembly. The retrieval mechanism is disposed on the sheath and includes a locking rope fixed to the sheath and slidably connected to the support shell. A second connecting rope is fixed to the locking rope, and an intercepting block is fixed to the second connecting rope. The intercepting block is located inside the guide tube and contacts the sheath. The guide tube has holes for the locking rope and the second connecting rope to move. A force-shaping rope is fixed to the tightening member and slidably connected to the guide tube.

[0013] Preferably, the connection points of the first connecting rope and the force-shaping rope with the tightening member are located on both sides of the annular portion of the tightening member.

[0014] Preferably, the intercepting block is provided with a stabilizing groove to provide space for the tightening member.

[0015] Preferably, the external cylinder is fixedly connected to a suction tube, and the suction tube is connected to an interception tube.

[0016] Compared with the prior art, the present invention has the following advantages: The present invention, through the shape design and staggered arrangement of the first and second convex rings, forms several annular cavities with opposite volume changes in conjunction with the patient's esophagus. When the first and second convex rings are squeezed by refluxed gastric juice, the reaction forces provided by adjacent annular cavities after compression are in different directions. These reaction forces in different directions can effectively disperse external forces, reducing the deformation of the first and second convex rings, thereby reducing the probability of seal failure. Furthermore, through the shape design of the anti-reflux sleeve and its intercepting groove, if the gastric juice in the sleeve has a tendency to reflux into the esophagus, the flow area of ​​the anti-reflux sleeve gradually decreases. The tendency to force the liquid film to move towards a narrower path increases flow resistance and reduces the probability of the anti-reflux sheath failing due to the impact of gastric juice in the cannula. The first connecting rope and tightening device actively expel some residual gastric juice from the cannula after the patient's vomiting reaction, reducing the probability of solid matter accumulating in the cannula and causing blockage that affects subsequent gastric juice drainage. The second connecting rope pulls the locking rope, which in turn causes the sheath to compress the support shell, thus deforming the support shell (even if the support shell contracts inward), facilitating the removal of the glottis mask. This also reduces the patient's discomfort during removal and lowers the probability of the patient scratching the glottis mask with their teeth. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 2 This is a three-dimensional structural diagram of the internal structure of the external cylinder of the present invention;

[0019] Figure 3 This is a three-dimensional sectional view of the external cylinder and air guide tube of the present invention;

[0020] Figure 4 This is a three-dimensional structural cross-sectional view of the support shell and sheath of the present invention;

[0021] Figure 5 This is a three-dimensional structural cross-sectional view of the guide tube and air cylinder of the present invention;

[0022] Figure 6 This is a bottom view of the three-dimensional structure of the first connecting rope and the tightening member of the present invention;

[0023] Figure 7 This is a three-dimensional structural diagram of the sheath and locking rope of the present invention;

[0024] Figure 8 This is a three-dimensional structural diagram of the tightening component and elastic rope of the present invention;

[0025] Figure 9 This is a three-dimensional structural diagram of the suction tube and the interception tube of the present invention.

[0026] Reference numerals: 1. External cylinder, 2. Air guide tube, 3. Support shell, 4. Sheath, 5. First inflation tube, 6. Flow guide tube, 7. Inflation cylinder, 701. First convex ring, 702. Second convex ring, 703. Anti-bend part, 8. Second inflation tube, 9. Sleeve, 10. First connecting rope, 11. Tightening component, 12. Elastic rope, 13. Anti-backflow sleeve, 14. Interception groove, 15. Locking rope, 16. Second connecting rope, 17. Interception block, 18. Force distribution rope, 19. Stabilizing groove, 20. Suction tube, 21. Interception tube. Detailed Implementation

[0027] First, it should be noted that in different described embodiments, the same components are given the same reference numerals or the same component names. The disclosure contained throughout this specification can be applied semantically to the same components having the same reference numerals or the same component names. The location descriptions selected in the specification, such as upper, lower, lateral, etc., also refer to the directly described and illustrated figures and are semantically applied to the new location when the location changes.

[0028] Example 1

[0029] This embodiment discloses a convenient multi-channel glottic mask, which is used to enhance the seal between the laryngeal mask (glottic mask) and the esophagus when the laryngeal mask (glottic mask) is used, thereby reducing the probability of airway reflux.

[0030] like Figures 1-6As shown, the glottic mask includes an external tube 1, to which an air delivery tube 2 is fixedly connected. The air delivery tube 2 is fixedly connected to and connected to a support shell 3. A cuff 4 is fixedly connected to the support shell 3. The right side of the air delivery tube 2 is connected to an external air supply system. The cuff 4 is connected to a first inflation tube 5. When not in use, the cuff 4 is in a contracted state. When in use, the glottic mask is first placed in the designated position (the patient's pharynx), and then air is inflated into the cuff 4 through the first inflation tube 5, causing the cuff 4 to expand and thus seal the trachea (i.e., it is in a contracted state before entering the oral cavity and then expands, reducing patient discomfort and facilitating safe operation). The first inflation tube 5 is fixedly connected to the outer tube 1. The outer tube 1 is fixedly connected to the guide tube 6, which is fixedly connected to the support shell 3. The left side of the guide tube 6 is fixedly connected to the inflation tube 7. The inflation tube 7 is connected to the second inflation tube 8. The inflation tube 7, like the cuff 4, is in a contracted state when not in use. When in use, air is inflated into the inflation tube 7 through the second inflation tube 8, thereby expanding the inflation tube 7 and blocking the esophagus, reducing the probability of gastric juice overflow causing the cuff 4 to fail to seal. The second inflation tube 8 is fixedly connected to the outer tube 1. The inflation tube 7 is equipped with a flow-blocking unit to prevent gastric juice reflux.The flow-blocking unit includes spaced-apart first convex rings 701 connected to an air cylinder 7. Spaced-apart second convex rings 702 are connected to the air cylinder 7. The thickness of the first and second convex rings 701 gradually decreases from the inside to the outside. Both the first and second convex rings 701 and 702 are elastic air bladders, and adjacent first and second convex rings 701 and 702 are symmetrically distributed from left to right. The first and second convex rings 701 and 702 are flexibly connected to the air cylinder 7. The first convex ring 701 and the second convex rings 702, which are spaced apart, are staggered. Both the first convex ring 701 and the second convex ring 702 are annular structures that gradually bend from the outside to the inside, and both have anti-bending parts 703 at the inner bend. The hardness of the anti-bending parts 703 is greater than that of the other parts. Taking the first second convex ring 702 on the left as an example, there are first convex rings 701 on both sides of the second convex ring 702. The volume of the annular cavity formed between the second convex ring 702 and the first convex ring 701 on the left gradually decreases from the inside to the outside. The volume of the annular cavity formed between the first convex ring 701 and the right first convex ring 702 gradually decreases from the outside to the inside. When the first convex ring 701 and the second convex ring 702 are squeezed by refluxed gastric juice (hereinafter referred to as external force), (for example, when the leftmost first convex ring 701 tends to move to the right under external force, due to the strong bending resistance of the anti-bending part 703, it first swings to the right when compressed, thus causing the volume of the annular cavity between the left first convex ring 701 and the adjacent second convex ring 702 to gradually decrease), the reaction forces provided by the two different annular cavities after being compressed are in different directions. The reaction forces in different directions can effectively disperse the external force, reduce the deformation of the first convex ring 701 and the second convex ring 702, and when the external force squeezes the annular cavity, the gradient of the annular cavity volume change will force the structure to generate nonlinear deformation resistance. This asymmetric volume change can improve the local stiffness, similar to the mechanical characteristics of a bellows or honeycomb structure, thereby suppressing displacement and reducing the probability of sealing failure. The guide tube 6 is equipped with an anti-blocking mechanism to prevent gastric reflux from blocking the flow channel.

[0031] like Figures 2-6As shown, the anti-blocking mechanism includes a sleeve 9, which is made of elastic material and can automatically reset when not under pressure. A silicone check valve is installed inside the sleeve 9. The sleeve 9 is fixed inside the guide tube 6, and a first connecting rope 10 is slidably connected to the guide tube 6. The tightening member 11 consists of a rope and a ring. The tail end of the rope is connected to the ring, and the head end of the rope passes through the ring. A blocking block is provided on the part of the rope near the tail end. This blocking block is larger than the ring of the tightening member 11 and is used to limit the minimum shrinkage of the tightening member 11. Within a small area, the annular portion of the tightening member 11 and the blocking ball on the rope portion of the tightening member 11 are located on the upper and lower sides of the sleeve 9, respectively. When the blocking ball on the tightening member 11 contacts the annular portion of the tightening member 11, the first end of the rope portion is fixedly connected to the first connecting rope 10, and its annular portion is located on the lower side inside the guide tube 6. The tightening member 11 is located between the guide tube 6 and the sleeve 9. An elastic rope 12 is fixedly connected to the annular portion of the tightening member 11. The elastic rope 12 is a spiral elastic rope and can elastically stretch and contract. The elastic rope 12 is used to ensure the tightening member... The annular portion of 11 is always positioned below the guide tube 6, causing the tightening component 11 to reset. The elastic rope 12 is fixedly connected to the sleeve 9. The guide tube 6 is fixedly connected to an anti-reflux sleeve 13. The flow area of ​​the anti-reflux sleeve 13 gradually decreases from the side closer to the guide tube 6 to the side farther away from the guide tube 6. The anti-reflux sleeve 13 is generally shaped like a frustum, with the side with the larger diameter located closer to the guide tube 6. The flow area of ​​the anti-reflux sleeve 13 gradually decreases from right to left. If the gastric juice in the sleeve 9 has a tendency to reflux into the esophagus, The anti-reflux sleeve 13 forces gastric juice to move towards a narrower path, increasing flow resistance. Simultaneously, it utilizes the surface tension of the gastric juice entering the anti-reflux sleeve 13 to provide flow resistance for the gastric juice in the sleeve 9. The anti-reflux sleeve 13 is equipped with a flow-blocking groove 14. When the gastric juice flows out of the sleeve 9, the flow-blocking groove 14 first changes the flow direction of the gastric juice, thereby causing the gastric juice on the periphery to impact the gastric juice in the middle, reducing the impact force of the gastric juice on the anti-reflux sleeve 13, that is, reducing the probability of the anti-reflux sleeve 13 failing due to the impact of the gastric juice in the sleeve 9.

[0032] The working process of the glottis in this embodiment is as follows:

[0033] The glottic mask is disinfected and then placed in the oral cavity. The support shell 3 and the cuff 4 are positioned in the patient's larynx, and the air cylinder 7 is positioned in the patient's esophagus. Air is then injected into the cuff 4 and the air cylinder 7 through the first air tube 5 and the second air tube 8, respectively, causing the cuff 4 to gradually inflate. The inflated cuff 4 seals the airway. Air is injected into the first convex ring 701 and the second convex ring 702 through the air cylinder 7, causing them to expand and seal the esophagus. The pressure between the cuff 4, the air cylinder 7, and the human body is controlled within a suitable range. Then, the air delivery tube 2 is connected to the external air supply system, and the sleeve 9 is connected to the external storage bag. The surgery can then be performed. After the surgery, the cuff 4 and the air cylinder 7 are deflated, and the device is removed from the patient's larynx.

[0034] If gastric reflux occurs during surgery, the gastric juice, under pressure, overflows upwards through the anti-reflux cap 13 and the cannula 9 into the external storage bag until the reflux ends. To prevent solid matter from accumulating inside the cannula 9 and causing blockage that could affect subsequent gastric juice drainage, the first connecting rope 10 is pulled. The first connecting rope 10 moves the head end of the tightening member 11 to the right, increasing the distance between the head and tail ends of the tightening member 11 (i.e., the ring formed by the tightening members 11 contracts), thereby squeezing the cannula 9 and reducing its flow area. As the connecting rope 10 is continued to be pulled, the tightening member 11 is locked to the limit. The sleeve 9 is gradually moved to the right while the elastic rope 12 is stretched, thereby squeezing out the gastric juice (solid matter) remaining in the sleeve 9. This reduces the probability that the solid matter in the sleeve 9 will accumulate and cause blockage, affecting the subsequent discharge of gastric juice. The tail end of the tightening member 11 is always located on the lower side of the sleeve 9. Even if there is some residue, it will only accumulate on the lower side of the sleeve 9 and will not affect the flow state of the sleeve 9. When the tightening member 11 moves to the right end of the sleeve 9, the first connecting rope 10 is released. The sleeve 9 squeezes and compresses the tightening member 11, restoring the shape of the tightening member 11. The elastic rope 12 drives the tightening member 11 to reset its position.

[0035] Example 2

[0036] This embodiment discloses a convenient multi-channel acoustic shield, which is a further improvement on Embodiment 1.

[0037] The structure, connection relationship, and working process of the detection device in Example 1 will not be repeated. The working principle of the following structure will be explained in detail. The same applies to subsequent examples.

[0038] like Figures 4-9As shown, it also includes a retrieval mechanism for easy removal of the entire assembly. The retrieval mechanism is mounted on the sheath 4 and includes a locking rope 15. The locking rope 15 itself is inelastic, and its two ends are fixed to the front and rear sides of the sheath 4, respectively. The locking rope 15 is slidably connected to the support shell 3, and the slidable connection point is located at the bottom inside the support shell 3. A second connecting rope 16 is fixedly connected to the locking rope 15, and the second connecting rope 16 is located in the middle of the locking rope 15, so that the locking rope 15 is subjected to balanced force. An intercepting block 17 is fixedly connected to the lower side of the second connecting rope 16. The intercepting block 17 is located inside the guide tube 6 and contacts the sheath 9. The guide tube 6 is provided with holes for the locking rope 15 and the second connecting rope 16 to move. A force-shaping rope 18 is fixedly connected to the tightening member 11. The tightening member 11 and the force-shaping rope 18 can pass through the annular part of the tightening member 11 at the same time. The force-shaping rope 18 is slidably connected to the guide tube 6. The first connecting rope 10 and the force-shaping rope 18 are connected to the sheath 4. The connection points of the rope 18 and the tightening member 11 are located on both sides of the annular portion of the tightening member 11, so that when the first connecting rope 10 and the force-shaping rope 18 pull the tightening member 11 together, the tightening member 11 is subjected to balanced force and will not tighten. If the tightening member 11 does not tighten, the intercepting block 17 is located on the moving path of the tightening member 11. The intercepting block 17 is provided with a stabilizing groove 19. The lower left side of the intercepting block 17 is provided with an inclined surface for guiding the tightening member 11. The tightening member 11 is guided into the stabilizing groove 19 by the inclined surface on the intercepting block 17. The stabilizing groove 19 is used to provide space for the tightening member 11 to improve the stability of the connection between the intercepting block 17 and the tightening member 11 and reduce the possibility of losing the connection between the intercepting block 17 and the tightening member 11 during the driving process. The outer tube 1 is fixedly connected to the suction tube 20, which is connected to the intercepting tube 21. The right and lower sides of the intercepting tube 21 are provided with evenly distributed through holes for suctioning the patient's saliva when the laryngeal mask is used.

[0039] The working process of the glottis in this embodiment is as follows:

[0040] After the glottis is used (i.e., when it needs to be removed), the gas inside the cuff 4, air cylinder 7, first convex ring 701, and second convex ring 702 is released. The first connecting rope 10 and the force-shaping rope 18 are pulled together. The tightening member 11 will not compress under the influence of symmetrical tension, thus causing the first connecting rope 10 and the force-shaping rope 18 to jointly move the tightening member 11 to the right, while simultaneously stretching the elastic rope 12. During this process, the tightening member 11 contacts the intercepting block 17 and causes the intercepting block 17 to move to the right. The intercepting block 17, under the influence of... During the pulling process, the device gradually swings, causing the tightening member 11 to embed into the stabilizing groove 19. As the intercepting block 17 moves to the right, the intercepting block 17 pulls the locking rope 15 downward through the second connecting rope 16. Both ends of the locking rope 15 move synchronously towards the middle of the support shell 3, causing the sleeve 4 to squeeze the support shell 3, thereby deforming the support shell 3 (i.e., the support shell retracts inward). Then, the device can be removed in one piece, making it easier to remove the glottis. At the same time, it reduces the patient's discomfort when removing the glottis and reduces the probability of the patient scratching the glottis with their teeth.

[0041] When the glottic mask is placed inside the patient's body, the intercepting tube 21 is placed against the patient's throat, and the suction tube 20 is connected to the external suction device. The patient's secreted saliva is suctioned from time to time through the suction tube 20 and the intercepting tube 21 to reduce the probability of saliva causing problems with the glottic mask seal.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A portable multi-channel acoustic shield, characterized in that it includes... An external tube (1) is fixedly connected to an air guide tube (2). The air guide tube (2) is fixedly connected to and connected to a support shell (3). A cuff (4) is fixedly connected to the support shell (3). The cuff (4) is connected to a first inflation tube (5). The first inflation tube (5) is fixedly connected to the external tube (1). A flow guide tube (6) is fixedly connected to the external tube (1). The flow guide tube (6) is fixedly connected to the support shell (3). An inflation cylinder (7) is fixedly connected to the flow guide tube (6). A second inflation tube (8) is connected to the inflation cylinder (7). The second inflation tube (8) is fixedly connected to the external tube (1). A flow-blocking unit for blocking gastric juice reflux is provided on the inflation cylinder (7). The flow-blocking unit includes a first convex ring (701) spaced apart, the first convex ring (701) spaced apart is connected to the air cylinder (7), the air cylinder (7) is connected to a second convex ring (702) spaced apart, the first convex ring (701) and the second convex ring (702) are both elastic airbags, the first convex ring (701) spaced apart and the second convex ring (702) spaced apart are staggered, and the flow guide tube (6) is provided with an anti-blocking mechanism to prevent gastric reflux from blocking the flow channel; Both the first convex ring (701) and the second convex ring (702) are ring structures that gradually bend from the outside to the inside, and both are provided with anti-bending parts (703) at the inner bend. The hardness of the anti-bending parts (703) is greater than that of the other parts. The anti-blocking mechanism includes a sleeve (9), which is fixedly connected to the guide tube (6). The guide tube (6) is slidably connected to a first connecting rope (10). The first connecting rope (10) is fixedly connected to a tightening member (11). The tightening member (11) consists of a rope and a ring. The tail end of the rope is connected to the ring, and the head end of the rope passes through the ring. The tightening member (11) is located between the guide tube (6) and the sleeve (9). The tightening member (11) is fixedly connected to an elastic rope (12), which is fixedly connected to the sleeve (9). A blocking ball is rotatably connected to the portion of the rope near the tail end of the tightening member (11), and the blocking ball is larger than the annular portion of the tightening member (11).

2. A convenient multi-channel acoustic shield according to claim 1, characterized in that, The guide tube (6) is fixedly connected to an anti-backflow sleeve (13), and the flow area of ​​the anti-backflow sleeve (13) gradually decreases from the side closer to the guide tube (6) to the side farther away from the guide tube (6).

3. A convenient multi-channel acoustic shield according to claim 2, characterized in that, The anti-backflow sleeve (13) is provided with a flow interception groove (14).

4. A convenient multi-channel acoustic shield according to claim 3, characterized in that, It also includes a retrieval mechanism for easy removal of the whole unit. The retrieval mechanism is disposed on the sheath (4). The retrieval mechanism includes a locking rope (15), which is fixed to the sheath (4). The locking rope (15) is slidably connected to the support shell (3). The locking rope (15) is fixedly connected to a second connecting rope (16). The second connecting rope (16) is fixedly connected to an intercepting block (17). The intercepting block (17) is located inside the guide tube (6). The intercepting block (17) is in contact with the sheath (9). The guide tube (6) is provided with a hole for the locking rope (15) and the second connecting rope (16) to move. The tightening member (11) is fixedly connected to a force-sharing rope (18). The force-sharing rope (18) is slidably connected to the guide tube (6).

5. A convenient multi-channel acoustic shield according to claim 4, characterized in that, The connection points of the first connecting rope (10) and the force-shaping rope (18) with the tightening member (11) are located on both sides of the annular portion of the tightening member (11).

6. A convenient multi-channel acoustic shield according to claim 5, characterized in that, The intercepting block (17) is provided with a stabilizing groove (19) to provide space for the tightening member (11).

7. A convenient multi-channel acoustic shield according to claim 6, characterized in that, The external tube (1) is fixedly connected to a suction tube (20), and the suction tube (20) is connected to an interception tube (21).

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