Auxiliary therapeutic apparatus for dysphagia

Abstract

The invention discloses a dysphagia auxiliary therapeutic apparatus which comprises a supporting plate, a cannula hole and a positioning hole are formed in the supporting plate, a communicating catheter is arranged in the cannula hole, a nasal cavity tube is arranged in the positioning hole, a supporting tube is arranged in the communicating catheter in a sliding mode, and a guide tube is arranged in the supporting tube. A plurality of evenly-distributed fixing supports are arranged on the peripheral wall of the guide pipe, the fixing supports are fixedly connected with the pipe wall of the supporting pipe, and a plurality of through grooves are formed in the fixing supports. The invention relates to the technical field of auxiliary medical equipment for dysphagia. According to the auxiliary therapeutic apparatus for dysphagia, the strip-shaped skeleton is arranged in the tube wall of the communicating catheter and used for preventing the phenomenon that the communicating catheter is folded when the supporting tube is drawn, repeated friction on the esophagus of a patient can be effectively avoided, and therefore the purpose of protecting the esophageal mucosa of the patient is achieved; the safety of recovery treatment can be effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of dysphagia auxiliary medical equipment, and in particular to a dysphagia auxiliary therapeutic device. Background Art

[0002] Cricopharyngeal achalasia is one of the common complications of stroke. Cricopharyngeal achalasia is characterized by difficulty in swallowing food. Food stays in the oropharynx and cannot enter the esophagus, so the meal time is greatly prolonged. If the food is liquid, it will be accidentally inhaled into the respiratory tract after swallowing, causing choking and coughing. At the same time, there will be food blockage and a foreign body sensation in the throat when swallowing food. In severe cases, it can lead to complications such as malnutrition and weight loss. In the prior art, a balloon catheter is inserted into the patient's esophagus, and the esophagus of the patient is supported by the expansion of the balloon catheter, and then the esophagus of the patient is stimulated by pulling the balloon catheter to simulate the contraction of the cricopharyngeal muscle during swallowing, so as to perform rehabilitation training on the muscles of the patient's esophagus; However, when the balloon catheter is pulled out, it is easy to rub against the inside of the patient's esophagus, causing damage to the mucosa of the inner wall of the esophagus and even easily scratching the esophagus.

[0003] Therefore, those skilled in the art provide a dysphagia auxiliary treatment device to solve the problems raised in the above background technology. Summary of the invention

[0004] The purpose of the present invention is to provide a swallowing disorder auxiliary treatment device to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: The above technical objectives of the present invention are achieved through the following technical solutions: A swallowing disorder auxiliary therapeutic device comprises a supporting plate, wherein an insertion hole and a positioning hole are provided inside the supporting plate, a connecting tube is provided inside the insertion hole, a nasal tube is provided inside the positioning hole, a supporting tube is slidably provided inside the connecting tube, a guiding tube is provided inside the supporting tube, a plurality of evenly distributed fixing brackets are provided on the outer peripheral wall of the guiding tube, the fixing brackets are fixedly connected to the tube wall of the supporting tube, a plurality of through grooves are provided inside the fixing brackets, an isolation plate is provided on the outer peripheral wall of the guiding tube and located between two fixing brackets, the isolation plate is fixedly connected to the guiding tube, a blocking structure is provided at the bottom end of the guiding tube, and an inflatable structure is provided at one end of the supporting tube; An inner concave surface is arranged on the inner wall of the support tube and at a position corresponding to the isolation plate. A lead-out hole is opened at the tube mouth of the support tube. The top end of the guide tube extends to the outside of the support tube through the lead-out hole. An adjustment structure is arranged at one end of the guide tube extending out of the support tube.

[0006] Furthermore, the bottom end of the guide tube is closed, a discharge hole is opened on the outer wall of the bottom end of the guide tube, and the discharge hole is connected to the inner tube cavity of the guide tube, and a sealing ring is provided at a position of the outer wall of the guide tube corresponding to the lead-out hole.

[0007] Furthermore, the inflatable structure includes a silicone airbag, the end of the silicone airbag is provided with a threaded interface, and the end of the support tube is provided with an external threaded port that matches the threaded interface.

[0008] Furthermore, the adjustment structure includes a connecting spiral tube, the inner tube wall of the connecting spiral tube is provided with an inner screw groove, the internal thread of the connecting spiral tube is connected to a sealing rod, the bottom end of the sealing rod is provided with a sealing plate, the top end of the sealing rod is provided with a turntable, the connecting spiral tube is fixedly arranged on the upper tube mouth of the guide tube, and the inner cavity of the connecting spiral tube is connected with the inner tube cavity of the guide tube.

[0009] Furthermore, the blocking structure includes a blocking disk, which is sleeved on the outer peripheral wall of the guide tube and located at the bottom end of the support tube. The blocking disk is slidably connected to the support tube. A fixed platform is provided at the bottom end of the guide tube. A supporting spring is provided at the top of the fixed platform. The top of the supporting spring is fixedly connected to the blocking disk. A telescopic sleeve is fixedly provided at the top of the fixed platform near the edge, and the top of the telescopic sleeve is fixedly connected to the blocking disk. A visual lens is provided at the bottom end of the fixed platform.

[0010] Furthermore, the edge of the isolation plate is arranged in an arc shape, and the outer peripheral wall of the isolation plate is in contact with the inner concave surface.

[0011] Furthermore, the connecting catheter includes a locking tube and an expansion tube. The locking tube is slidably arranged inside the insertion hole. The expansion tube is fixedly connected to the locking tube, and the expansion tube is made of elastic silicone material. The outer peripheral wall of the locking tube is provided with an adjustment scale, and the side of the adjustment scale is provided with a locking groove.

[0012] Furthermore, a limiting tube is arranged on the outer peripheral wall of the support plate at a position corresponding to the tube insertion hole, the internal thread of the limiting tube is connected with a locking bolt, and the bottom end of the locking bolt is provided with a fixing block matching with the locking groove.

[0013] In summary, the present invention includes at least one of the following beneficial technical effects: 1. In this swallowing disorder auxiliary treatment device, after the support tube is expanded, the user holds the support plate tightly to make the support plate fit the patient's nose, and pulls the support tube in the process of squeezing the inflatable structure, so that the support tube slides inside the connecting duct, and the position of the expanded part changes continuously, so as to simulate the work of the cricopharyngeal muscle during normal swallowing, thereby achieving the purpose of treating the patient; 2. In this swallowing disorder auxiliary treatment device, a strip skeleton is arranged inside the tube wall of the connecting tube to prevent the connecting tube from folding when the supporting tube is twitched, which can effectively avoid repeated friction on the patient's esophagus, thereby achieving the purpose of protecting the patient's esophageal mucosa and effectively improving the safety of recovery treatment; 3. This swallowing disorder auxiliary treatment device, when the patient needs to take in liquid food, removes the inflation structure, inserts the liquid food injection catheter into the end of the support tube, injects the liquid food, and opens the blocking structure by adjusting the structure at the same time, so that the bottom end of the support tube is in an open state. When the food flows through the inner concave surface, the support tube will be propped up, and the patient's cricopharyngeal muscle will be stimulated, and the food will enter the patient's esophagus through the opening at the bottom of the support tube. While supplementing the patient's nutrition, it can effectively simulate the working process of the cricopharyngeal muscle and the feeling after swallowing, and can effectively stimulate the patient's nerves to make the cricopharyngeal muscle adapt to the process of eating, so as to achieve the purpose of treating the cricopharyngeal muscle. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a structural schematic diagram of a swallowing disorder auxiliary treatment device of the present invention; Figure 2 It is a structural schematic diagram of an inflation mechanism of a swallowing disorder auxiliary treatment device of the present invention; Figure 3 It is a structural schematic diagram of a connecting catheter of a swallowing disorder auxiliary treatment device of the present invention; Figure 4 It is a schematic diagram of the internal structure of a support tube of a swallowing disorder auxiliary treatment device of the present invention; Figure 5 It is a structural schematic diagram of a guide tube of a swallowing disorder auxiliary treatment device of the present invention; Figure 6 The invention relates to a swallowing disorder auxiliary treatment device. Figure 5 A magnified view of the structure at A; Figure 7 The invention relates to a swallowing disorder auxiliary treatment device. Figure 5 A magnified view of the structure at B; Figure 8 It is a schematic diagram of the internal planar structure of a support tube of a swallowing disorder auxiliary treatment device of the present invention.

[0016] In the figure, 1, support plate; 101, limit tube; 102, locking bolt; 103, fixing block; 2, insertion hole; 3, positioning hole; 4, connecting catheter; 401, locking tube; 402, expansion tube; 403, adjustment scale; 404, locking groove; 5, nasal tube; 6, support tube; 7, guide tube; 701, discharge hole; 702, sealing ring; 8, fixed bracket; 9, through groove; 10, isolation plate; 11, blocking structure; 1101, blocking disk; 1102, fixing table; 1103, supporting spring; 1104, telescopic sleeve; 12, inflatable structure; 1201, silicone airbag; 1202, threaded interface; 13, inner concave surface; 14, lead-out hole; 15, adjustment structure; 1501, connecting screw tube; 1502, sealing rod; 1503, turntable. DETAILED DESCRIPTION

[0017] Below, the invention is further described in conjunction with the accompanying drawings and specific embodiments: Embodiment 1:

[0018] Reference Figure 1 - Figure 8 The present invention discloses a swallowing disorder auxiliary therapeutic device, comprising a support plate 1, wherein an insertion hole 2 and a positioning hole 3 are provided inside the support plate 1, a connecting tube 4 is provided inside the insertion hole 2, a nasal tube 5 is provided inside the positioning hole 3, a supporting tube 6 is slidably provided inside the connecting tube 4, a guiding tube 7 is provided inside the supporting tube 6, a plurality of evenly distributed fixing brackets 8 are provided on the outer peripheral wall of the guiding tube 7, the fixing bracket 8 is fixedly connected to the tube wall of the supporting tube 6, a plurality of through grooves 9 are provided inside the fixing bracket 8, an isolation plate 10 is provided on the outer peripheral wall of the guiding tube 7 and located between the two fixing brackets 8, the isolation plate 10 is fixedly connected to the guiding tube 7, a blocking structure 11 is provided at the bottom end of the guiding tube 7, and an inflatable structure 12 is provided at one end of the supporting tube 6; An inner concave surface 13 is provided on the inner wall of the support tube 6 and at a position corresponding to the isolation plate 10. A lead-out hole 14 is opened at the pipe mouth of the support tube 6. The top end of the guide tube 7 extends through the lead-out hole 14 to the outside of the support tube 6. An adjustment structure 15 is provided at one end of the guide tube 7 extending out of the support tube 6.

[0019] In this embodiment, Figure 1 The overall structural diagram of the therapeutic apparatus shown in the figure, when in use, the connecting catheter 4 is inserted into the nasal cavity of the patient, and the connecting catheter 4 is gradually pushed into the esophagus of the patient through the nasal cavity, and the part of the support tube 6 provided with the fixing bracket 8 corresponds to the position of the cricopharyngeal muscle of the patient, at this time, the position of the support plate 1 is adjusted, the support plate 1 and the patient's nose are fitted together, and the nasal tube 5 is inserted into the other nostril of the patient, so as to achieve the purpose of fixing the connecting catheter 4; After the connecting conduit 4 is fixed, the inflatable structure 12 is manually squeezed to allow the air inside the inflatable structure 12 to be injected into the support tube 6. At this time, the wall thickness of the inner concave surface 13 inside the support tube 6 is relatively thin, so this part of the support tube 6 will expand, thereby pushing the connecting conduit 4 to expand accordingly. Then, the patient's cricopharyngeal muscle is squeezed and stimulated by the expansion of the pipeline to achieve the purpose of recovery treatment for the patient. At the same time, after the support tube 6 is expanded, the user holds the support plate 1 tightly to make the support plate 1 fit the patient's nose, and pulls the support tube 6 in the process of squeezing the inflatable structure 12, so that the support tube 6 slides inside the connecting tube 4, and the position of the expansion part changes continuously to simulate the normal work of the cricopharyngeal muscle during swallowing, thereby achieving the purpose of treating the patient. A strip skeleton is provided inside the tube wall of the connecting tube 4 to prevent the connecting tube 4 from folding when the support tube 6 is pulled, which can effectively avoid repeated friction on the patient's esophagus, thereby achieving the purpose of protecting the patient's esophageal mucosa and effectively improving the safety of recovery treatment. Furthermore, when the patient needs to take in liquid food, the inflatable structure 12 is removed, and the liquid food injection catheter is inserted into the end of the support tube 6. When the liquid food is injected, the blocking structure 11 is opened by adjusting the structure 15 at the same time, so that the bottom end of the support tube 6 is in an open state. When the food flows through the inner concave surface 13, the support tube 6 will be propped up, and the patient's cricopharyngeal muscle will be stimulated, and the food will enter the patient's esophagus through the opening at the bottom of the support tube 6. While supplementing the patient's nutrition, it can effectively simulate the working process of the cricopharyngeal muscle and the feeling after swallowing, and can effectively stimulate the patient's nerves so that the cricopharyngeal muscle can adapt to the process of eating, thereby achieving the purpose of improving the treatment effect.

[0020] In a further preferred embodiment of the present invention, Figure 2 , Figure 4 and Figure 6 As shown, the bottom end of the guide tube 7 is closed, a discharge hole 701 is opened on the outer wall of the bottom end of the guide tube 7, and the discharge hole 701 is connected to the inner tube cavity of the guide tube 7, and a sealing ring 702 is provided at the position of the outer wall of the guide tube 7 corresponding to the lead-out hole 14.

[0021] In this embodiment, the inner lumen of the guide tube 7 is connected to the blocking structure 11 through the closed hole, so that the blocking structure 11 can be controlled by the adjustment structure 15 .

[0022] In a further preferred embodiment of the present invention, Figure 2 As shown, the inflatable structure 12 includes a silicone airbag 1201 , a threaded interface 1202 is provided at the end of the silicone airbag 1201 , and an external threaded port matched with the threaded interface 1202 is provided at the end of the support tube 6 .

[0023] In this embodiment, the silicone airbag 1201 and the support tube 6 are interconnected through the threaded interface 1202 and the external thread, so that the silicone airbag 1201 is connected to the support tube 6, and then when the silicone airbag 1201 is pressed, the air in the airbag can be pressed into the interior of the support tube 6 to control the expansion of the support tube 6, thereby achieving the purpose of stimulating the patient's cricopharyngeal muscle.

[0024] In a further preferred embodiment of the present invention, Figure 5 As shown, the adjustment structure 15 includes a connecting screw tube 1501, the inner tube wall of the connecting screw tube 1501 is provided with an inner screw groove, the internal thread of the connecting screw tube 1501 is connected to a sealing rod 1502, the bottom end of the sealing rod 1502 is provided with a sealing plate, the top end of the sealing rod 1502 is provided with a turntable 1503, the connecting screw tube 1501 is fixedly arranged on the upper tube mouth of the guide tube 7, and the inner cavity of the connecting screw tube 1501 is connected to the inner tube cavity of the guide tube 7.

[0025] In this embodiment, since the connecting spiral tube 1501 and the guide tube 7 are fixedly connected and interconnected, the volume of the internal cavity of the connecting spiral tube 1501 can be effectively adjusted during the movement of the sealing rod 1502, thereby achieving the purpose of controlling the internal space of the connecting spiral tube 1501 and the guide tube 7.

[0026] In a further preferred embodiment of the present invention, Figure 6 As shown, the blocking structure 11 includes a blocking disk 1101, which is sleeved on the outer peripheral wall of the guide tube 7 and located at the bottom end of the support tube 6. The blocking disk 1101 is slidably connected to the support tube 6. A fixed platform 1102 is provided at the bottom end of the guide tube 7. A supporting spring 1103 is provided at the top of the fixed platform 1102. The top of the supporting spring 1103 is fixedly connected to the blocking disk 1101. A telescopic sleeve 1104 is fixedly provided at the top of the fixed platform 1102 near the edge, and the top of the telescopic sleeve 1104 is fixedly connected to the blocking disk 1101. A visual lens is provided at the bottom end of the fixed platform 1102. The end wall of the support plate 1 is provided with a connecting wire, and a sight meter is provided at the end of the connecting wire. The sight meter and the visual lens are connected to each other through a wire passing through the guide tube 7 to provide power to the visual lens and display the picture taken by the visual lens on the sight meter.

[0027] In this embodiment, the telescopic sleeve 1104, the blocking disk 1101 and the fixing platform 1102 together form a telescopic closed cavity, which is connected to the inner tube cavity of the guide tube 7 through the discharge hole 701, and the closed cavity, the guide tube 7 and the connecting spiral tube 1501 are all loaded with liquid; The blocking plate is used to block the bottom of the support tube 6. When the blocking plate blocks the support tube 6, the sealing rod 1502 is completely inside the connecting spiral tube 1501. At this time, the volume inside the connecting spiral tube 1501 is at a minimum value. At this time, the liquid inside the connecting spiral tube 1501 will enter the closed cavity through the guide tube 7, thereby causing the blocking plate 1101 to move upward and block the bottom end of the support tube 6 through the blocking plate 1101. On the other hand, when the support tube 6 is opened, the turntable 1503 is manually rotated to gradually rotate the sealing rod 1502 out of the connecting spiral tube 1501, so that the cavity in the connecting spiral tube 1501 gradually increases, so that the liquid inside the guide tube 7 enters the interior of the connecting spiral tube 1501, and then the liquid inside the closed cavity enters the interior of the guide tube 7. Since the liquid cannot be compressed, the telescopic sleeve 1104 will pull the blocking disk 1101 downward, so that the blocking disk 1101 and the support tube 6 fall off from each other, thereby achieving the purpose of opening the support tube 6. In a further preferred embodiment of the present invention, Figure 4 and Figure 8 As shown, the edge of the isolation plate 10 is arranged in an arc shape, and the outer peripheral wall of the isolation plate 10 is in contact with the inner concave surface 13.

[0028] In this embodiment, the arc-shaped isolation plate 10 can effectively guide the air or the liquid food required by the patient, so that when the air or liquid food enters, it can effectively push the inner concave surface 13 to expand, so as to support the expansion of the tube 6 and stimulate the patient's cricopharyngeal muscle.

[0029] In a further preferred embodiment of the present invention, Figure 3 As shown, the connecting conduit 4 includes a locking tube 401 and an expansion tube 402. The locking tube 401 is slidably arranged inside the insertion hole 2. The expansion tube 402 is fixedly connected to the locking tube 401, and the expansion tube 402 is made of elastic silicone material. The outer peripheral wall of the locking tube 401 is provided with an adjustment scale 403, and the side of the adjustment scale 403 is provided with a locking groove 404.

[0030] In this embodiment, the locking tube 401 is provided to fix the connecting tube 4, and the support plate 1 is provided to fix the connecting tube 4 relative to the patient's nose to prevent the connecting tube 4 from moving when the patient's cricopharyngeal muscle is stimulated, to prevent excessive friction on the mucosa in the patient's esophagus, and to achieve the purpose of protecting the patient's esophagus.

[0031] In a further preferred embodiment of the present invention, Figure 3As shown, a limit tube 101 is provided on the outer wall of the support plate 1 and at a position corresponding to the tube insertion hole 2. The internal thread of the limit tube 101 is connected with a locking bolt 102. The bottom end of the locking bolt 102 is provided with a fixing block 103 that matches the locking groove 404.

[0032] In this embodiment, the limiting tube 101 is used to install the locking bolt 102. When in use, the locking bolt 102 is rotated to push the fixing block 103 to move, so that the fixing block 103 is inserted into the locking groove 404 or the fixing block 103 is pulled out from the inside of the locking groove 404, so as to achieve the purpose of fixing the support plate 1 and the connecting conduit 4 or releasing the fixing relationship between the support plate 1 and the connecting conduit 4.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A swallowing disorder auxiliary treatment device, characterized in that: The invention comprises a support plate (1), wherein the support plate (1) is provided with a tube insertion hole (2) and a positioning hole (3), a connecting tube (4) is provided inside the tube insertion hole (2), a nasal tube (5) is provided inside the positioning hole (3), a supporting tube (6) is slidably provided inside the connecting tube (4), a guiding tube (7) is provided inside the supporting tube (6), a plurality of evenly distributed fixing brackets (8) are provided on the outer peripheral wall of the guiding tube (7), the fixing brackets (8) are fixedly connected to the tube wall of the supporting tube (6), a plurality of through grooves (9) are provided inside the fixing brackets (8), an isolation plate (10) is provided on the outer peripheral wall of the guiding tube (7) and is located between the two fixing brackets (8), the isolation plate (10) is fixedly connected to the guiding tube (7), a blocking structure (11) is provided at the bottom end of the guiding tube (7), and an inflatable structure (12) is provided at one end of the supporting tube (6); An inner concave surface (13) is provided on the inner wall of the support tube (6) and at a position corresponding to the isolation plate (10); an outlet hole (14) is provided at the tube mouth of the support tube (6); the top end of the guide tube (7) passes through the outlet hole (14) and extends to the outside of the support tube (6); and an adjustment structure (15) is provided at one end of the guide tube (7) extending out of the support tube (6).

2. The swallowing disorder auxiliary treatment device according to claim 1, characterized in that: The bottom end of the guide tube (7) is closed, a discharge hole (701) is provided on the outer wall of the bottom end of the guide tube (7), and the discharge hole (701) is connected to the inner tube cavity of the guide tube (7), and a sealing ring (702) is provided at a position corresponding to the outlet hole (14) on the outer wall of the guide tube (7).

3. The swallowing disorder auxiliary treatment device according to claim 2, characterized in that: The inflatable structure (12) comprises a silicone airbag (1201), the end of the silicone airbag (1201) is provided with a threaded interface (1202), and the end of the support tube (6) is provided with an external threaded port that matches the threaded interface (1202).

4. The swallowing disorder auxiliary treatment device according to claim 3, characterized in that: The regulating structure (15) comprises a connecting spiral tube (1501), the inner tube wall of the connecting spiral tube (1501) is provided with an inner screw groove, the inner thread of the connecting spiral tube (1501) is connected to a sealing rod (1502), the bottom end of the sealing rod (1502) is provided with a sealing plate, the top end of the sealing rod (1502) is provided with a rotating disk (1503), the connecting spiral tube (1501) is fixedly arranged at the upper tube opening of the guide tube (7), and the inner cavity of the connecting spiral tube (1501) is connected to the inner tube cavity of the guide tube (7).

5. The swallowing disorder auxiliary treatment device according to claim 4, characterized in that: The blocking structure (11) comprises a blocking disk (1101), the blocking disk (1101) being sleeved on the outer peripheral wall of the guide tube (7) and being located at the bottom end of the support tube (6), the blocking disk (1101) being slidably connected to the support tube (6), a fixing platform (1102) being provided at the bottom end of the guide tube (7), a supporting spring (1103) being provided at the top end of the fixing platform (1102), the top end of the supporting spring (1103) being fixedly connected to the blocking disk (1101), a telescopic sleeve (1104) being fixedly provided at the top end of the fixing platform (1102) near the edge, the top end of the telescopic sleeve (1104) being fixedly connected to the blocking disk (1101), and a visual lens being provided at the bottom end of the fixing platform (1102).

6. The swallowing disorder auxiliary treatment device according to claim 5, characterized in that: The edge of the isolation plate (10) is arranged in an arc shape, and the outer peripheral wall of the isolation plate (10) is in contact with the inner concave surface (13).

7. The swallowing disorder auxiliary treatment device according to claim 6, characterized in that: The connecting conduit (4) comprises a locking tube (401) and an expansion tube (402); the locking tube (401) is slidably arranged inside the insertion hole (2); the expansion tube (402) is fixedly connected to the locking tube (401); the expansion tube (402) is made of elastic silicone material; an outer peripheral wall of the locking tube (401) is provided with an adjustment scale (403); and a locking groove (404) is provided on the side of the adjustment scale (403).

8. The swallowing disorder auxiliary treatment device according to claim 7, characterized in that: A limiting tube (101) is provided on the outer peripheral wall of the support plate (1) at a position corresponding to the tube insertion hole (2); a locking bolt (102) is connected to the inner thread of the limiting tube (101); a fixing block (103) matching the locking groove (404) is provided at the bottom end of the locking bolt (102).

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