Minimally invasive catheter fixing and adjusting device for nerve intervention

Abstract

The invention relates to the technical field of minimally invasive catheter fixing and adjusting, and discloses a minimally invasive catheter fixing and adjusting device for nerve intervention. Comprising a neck ring, sliding seats are slidably connected to the front surface and the rear surface of the neck ring, fixing seats are fixedly connected to the upper surfaces of the sliding seats, first rubber blocks are arranged on the upper surfaces of the fixing seats, and air bags are arranged on the upper surfaces of the first rubber blocks; according to the minimally invasive catheter fixing device, the extrusion seat moves downwards, so that the extrusion seat can extrude the minimally invasive catheter and the air bag, when the extrusion seat extrudes the air bag, the air bag can expand outwards towards the two sides under the extrusion influence, and the friction pad can be attached to the surface of the minimally invasive catheter through expansion of the two sides of the air bag; the minimally invasive catheter is extruded by the fixing seat, the extrusion seat and the air bag, so that the exposed minimally invasive catheter can be fixed when the minimally invasive catheter is used, and the clamping plate is rotated to be transversely arranged to be embedded with the limiting block to fix the extrusion seat.

Description

Technical Field

[0001] The present invention relates to the technical field of minimally invasive catheter fixing and adjusting, and in particular to a minimally invasive catheter fixing and adjusting device for neurointervention. Background Art

[0002] Neurointerventional technology, as the name implies, is the treatment of diseases of the nervous system. With the support of the digital subtraction angiography (DSA) system, it uses intravascular catheter operation technology to diagnose and treat lesions involving the human neurovascular system through specific methods such as selective angiography, embolization, dilatation, mechanical removal, and drug delivery. It is an emerging minimally invasive clinical technology that has opened up new ideas and treatment approaches for many brain and spinal vascular diseases. It can not only independently solve many cerebrovascular diseases, but also cleverly combine with traditional open surgery, radiotherapy, etc., so that diseases that were originally impossible or difficult to treat can achieve satisfactory results. Minimally invasive catheters are an indispensable part of neurointerventional surgery;

[0003] When the minimally invasive catheter is in use, due to arterial tortuosity in some elderly people and hypertensive patients, the 8F long sheath easily retreats to the level of the internal carotid artery C1, making it inconvenient to fix the minimally invasive catheter multiple times, affecting the normal use of the minimally invasive catheter in the later stage. At the same time, the length of the device is difficult to adjust when worn, and the tight wearing reduces the comfort of the device when worn. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies of the prior art, the present invention provides a minimally invasive catheter fixing and adjusting device for neurointervention. By sliding the sliding seat and the neck ring, the orientation of the sliding seat is adjusted according to the placement position of the minimally invasive catheter. After the orientation of the sliding seat is adjusted, by moving the sliding sleeve and the movable block, the clamping plate can be placed longitudinally. By engaging the sliding sleeve and the sliding rod, the sliding rod can be retracted into the interior of the sliding sleeve, so that the clamping plate can extend out and separate from the interior of the sliding plate, separating the extrusion seat from the fixed seat, and the minimally invasive catheter can be placed in the groove inside the fixed seat. After the minimally invasive catheter is placed, the extrusion seat can be fitted to the upper surface of the fixed seat. By using the telescopic movement of the sliding sleeve and the sliding rod again, the sliding rod can be extended out of the interior of the sliding sleeve, and the clamping plate can extend through the interior of the sliding plate. The extrusion seat is moved downward so that the extrusion seat can extrude the minimally invasive catheter and the airbag. When the extrusion seat extrudes the airbag, the airbag expands outward to both sides under the influence of extrusion. Through the expansion of both sides of the airbag, the friction pads can be fitted to the surface of the minimally invasive catheter. Combining the extrusion of the fixed seat, the extrusion seat and the airbag on the minimally invasive catheter, the minimally invasive catheter can be fixed when in use for the exposed minimally invasive catheter. Rotate the clamping plate so that it can be horizontally arranged and engaged with the limiting block to fix the extrusion seat. When the neck ring is worn on the patient's neck, the length of the first neck band can be adjusted according to the diameter of the patient's neck. Since there is a cloth band between multiple adjustment bands, when the first neck band is adjusted in length, the orientation of the adjustment band can be adjusted arbitrarily. After the distance between the first neck band and the second neck band is adjusted, the friction rod can be penetrated into the corresponding adjustment band. Since the friction rod is made of rubber, when the friction rod penetrates into the interior of the adjustment band, the friction between the friction rod and the adjustment band can be increased to fix the adjustment band. Using the rubber band and the binding band, the connection between the second neck band and the neck ring can be elastically arranged, thereby improving the comfort of the device when worn and other advantages.

[0006] (2) Technical solution

[0007] To solve the above technical problems, the present invention provides the following technical solution: It includes a neck ring, and sliding seats are slidably connected to both the front surface and the rear surface of the neck ring. A fixed seat is fixedly connected to the upper surface of the sliding seat. A first rubber block is arranged on the upper surface of the fixed seat, and an airbag is arranged on the upper surface of the first rubber block.

[0008] A sliding plate is fixedly connected to the upper surface of the fixed seat. A limiting block is fixedly connected to the side surface of the sliding plate. A sliding rod is slidably connected to the interior of the sliding plate. A clamping plate is fixedly connected to one end of the sliding rod close to the sliding plate, and the clamping plate is engaged with the limiting block. A sliding sleeve is sleeved on the other end of the sliding rod away from the sliding plate. An activity block is movably connected to the side surface of the sliding sleeve. An extrusion seat is fixedly connected to the side surface of the activity block. A second rubber block is arranged on the lower surface of the extrusion seat.

[0009] Preferably, a first spring is fixedly connected to the upper surface of the extrusion seat, and one end of the first spring away from the extrusion seat is fixedly connected to an inclined plate.

[0010] Preferably, a second spring is fixedly connected to the lower surface of the inclined plate, and one end of the second spring away from the inclined plate is fixedly connected to a limit seat, and the limit seat is slidably connected to the inclined plate.

[0011] Preferably, a rubber rod is arranged on the inner wall of the sliding seat, and the rubber rod is slidably connected to the neck ring. A hollow tube is fixedly connected to the inner wall of the sliding seat. A ball is movably connected inside the hollow tube, and the ball is slidably connected to the neck ring.

[0012] Preferably, a first neck band is arranged on the lower surface of the neck ring. A cloth band is arranged on the lower surface of the first neck band. An adjusting band is arranged on the lower surface of the cloth band.

[0013] Preferably, a second neck band is arranged on the lower surface of the neck ring. A soft plate is arranged on the side surface of the second neck band. A friction rod is arranged on the rear surface of the soft plate, and the friction rod is fitted and connected with the adjusting band.

[0014] Preferably, a rubber band is arranged on the side surface of the second neck band. A strap is arranged on the side surface of the rubber band.

[0015] Preferably, a connecting plate is arranged on the side surface of the rubber band, and the connecting plate is fixedly connected to the inside of the neck ring.

[0016] Preferably, grooves are provided on the upper surface of the fixed seat and the lower surface of the extrusion seat, and round holes are provided inside the adjusting band.

[0017] Preferably, chutes are provided on the front surface and the rear surface of the neck ring, and a friction pad is arranged on the side surface of the airbag.

[0018] Compared with the prior art, the present invention provides a minimally invasive catheter fixing and adjusting device for neurointervention, and has the following beneficial effects:

[0019] 1. The present invention utilizes the sliding of the slide seat and the neck ring to adjust the position of the slide seat according to the placement position of the minimally invasive catheter. When the position of the slide seat is adjusted, the movement of the slide sleeve and the movable block is utilized to place the card plate longitudinally. The engagement of the slide sleeve and the slide rod is utilized to allow the slide rod to be retracted into the interior of the slide sleeve, so that the card plate can be extended and separated from the interior of the slide plate, and the extrusion seat is separated from the fixed seat, so that the minimally invasive catheter can be placed in the groove inside the fixed seat. When the minimally invasive catheter is placed, the extrusion seat can be fitted with the upper surface of the fixed seat, and the expansion and contraction of the slide sleeve and the slide rod is utilized again to make the card plate The sliding rod can be extended from the interior of the sliding sleeve, and the clamping plate can extend through the interior of the sliding plate to move the extrusion seat downward so that the extrusion seat can squeeze the minimally invasive catheter and the airbag. When the extrusion seat squeezes the airbag, the airbag can expand outward to both sides due to the squeezing. The friction pad can fit with the surface of the minimally invasive catheter through the expansion of both sides of the airbag. The fixed seat, the extrusion seat and the airbag squeeze the minimally invasive catheter, so that the minimally invasive catheter exposed to the outside can be fixed when in use. The clamping plate is rotated so that it can be horizontally set and engaged with the limit block to fix the extrusion seat.

[0020] 2. When the neck ring of the present invention is worn on the patient's neck, the length of the first neck band can be adjusted according to the diameter of the patient's neck. Since cloth bands are provided between the plurality of adjustment bands, the orientation of the adjustment bands can be adjusted at will when the length of the first neck band is adjusted. After the spacing between the first neck band and the second neck band is adjusted, the friction rod can be inserted into the corresponding adjustment band. Since the friction rod is made of rubber, the friction force between the friction rod and the adjustment band can be increased when the friction rod passes through the inside of the adjustment band to fix the adjustment band. The rubber band and the drawstring can be used to make the connection between the second neck band and the neck ring elastic, thereby improving the comfort of the device when worn.

[0021] 3. When the extrusion seat and the fixing seat are used to fix the minimally invasive catheter, the present invention utilizes the elasticity of the first spring to form elasticity between the inclined plate and the top of the extrusion seat, and bends the inclined plate upward so that the redundant minimally invasive catheters can be arranged in an S shape. The minimally invasive catheter can be squeezed by the inclined plate, and the elasticity of the second spring is utilized to enable the limit seat to slide on the surface of the inclined plate to squeeze the second spring, so that the limit seat can limit and clamp the minimally invasive catheter, and cooperate with the inclined plate to make the minimally invasive catheter better fit the patient's neck. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the split structure of the fixing seat of the present invention;

[0024] Figure 3 This is a schematic diagram of the inclined plate structure when viewed from above;

[0025] Figure 4 Schematic diagram of the movable block structure of the present invention;

[0026] Figure 5 Schematic diagram of the second neck band structure of the present invention;

[0027] Figure 6 Schematic diagram of the bottom view of the sliding seat of the present invention.

[0028] Wherein: 1, neck ring; 2, first neck band; 3, adjustment band; 4, friction rod; 5, second neck band; 6, sliding seat; 7, inclined plate; 8, fixed seat; 9, first rubber block; 10, cloth band; 11, sliding plate; 12, sliding rod; 13, friction pad; 14, movable block; 15, sliding sleeve; 16, clamping plate; 17, limiting block; 18, limiting seat; 19, first rubber block; 20, airbag; 21, second rubber block; 22, first spring; 23, second spring; 24, connecting plate; 25, binding band; 26, rubber band; 27, round bead; 28, hollow tube; 29, rubber rod; 30, extrusion seat. Specific embodiments

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] Please refer to Figure 1-6, A minimally invasive catheter fixation and adjustment device for neurointervention, including a neck ring 1. During emergency interventional thrombectomy or emergency aneurysm interventional embolization, first, an 8F short sheath needs to be inserted through the right femoral artery, and then a three-axis system (an 8F long sheath, a 6F distal access catheter, a stent catheter or a microcatheter) is inserted through the 8F short sheath. During the operation, the 8F long sheath is inserted into the internal carotid artery at the C2 level. Sliding seats 6 are slidably connected to both the front surface and the rear surface of the neck ring 1. A fixed seat 8 is fixedly connected to the upper surface of the sliding seat 6. A first rubber block 19 is arranged on the upper surface of the fixed seat 8. An airbag 20 is arranged on the upper surface of the first rubber block 19. A friction pad 13 is arranged on the side surface of the airbag 20. A sliding plate 11 is fixedly connected to the upper surface of the fixed seat 8. A limiting block 17 is fixedly connected to the side surface of the sliding plate 11. A sliding rod 12 is slidably connected to the inside of the sliding plate 11. One end of the sliding rod 12 close to the sliding plate 11 is fixedly connected with a clamping plate 16, and the clamping plate 16 is fitted with the limiting block 17. A sliding sleeve 15 is sleeved on the end of the sliding rod 12 away from the sliding plate 11. A movable block 14 is movably connected to the side surface of the sliding sleeve 15. An extrusion seat 30 is fixedly connected to the side surface of the movable block 14. A second rubber block 21 is arranged on the lower surface of the extrusion seat 30. Chute grooves are provided on both the front surface and the rear surface of the neck ring 1. Grooves are provided on both the upper surface of the fixed seat 8 and the lower surface of the extrusion seat 30. When wearing the neck ring 1 on the patient's neck, by using the sliding of the sliding seat 6 and the neck ring 1, the orientation of the sliding seat 6 is adjusted according to the placement position of the minimally invasive catheter. After the orientation of the sliding seat 6 is adjusted, by using the movement of the sliding sleeve 15 and the movable block 14, the clamping plate 16 can be placed longitudinally. By using the fitting of the sliding sleeve 15 and the sliding rod 12, the sliding rod 12 can be retracted into the inside of the sliding sleeve 15, so that the clamping plate 16 can extend out of the inside of the sliding plate 11 and be separated, separating the extrusion seat 30 from the fixed seat 8, so that the minimally invasive catheter can be placed in the groove inside the fixed seat 8. After the minimally invasive catheter is placed, the upper surface of the extrusion seat 30 can be attached to the upper surface of the fixed seat 8. By using the expansion and contraction of the sliding sleeve 15 and the sliding rod 12 again, the sliding rod 12 can be extended out of the inside of the sliding sleeve 15, and the clamping plate 16 can extend through the inside of the sliding plate 11, moving the extrusion seat 30 downward, so that the extrusion seat 30 can squeeze the minimally invasive catheter and the airbag 20. When the extrusion seat 30 squeezes the airbag 20, the airbag 20 expands outward to both sides under the influence of extrusion. Through the expansion of both sides of the airbag 20, the friction pad 13 can be attached to the surface of the minimally invasive catheter. Cooperating with the squeezing of the fixed seat 8, the extrusion seat 30 and the airbag 20 on the minimally invasive catheter, the minimally invasive catheter can be fixed for the exposed minimally invasive catheter during use. Rotate the clamping plate 16 so that it can be horizontally arranged and fitted with the limiting block 17 to fix the extrusion seat 30.

[0031] The upper surface of the extrusion seat 30 is fixedly connected to a first spring 22. One end of the first spring 22 away from the extrusion seat 30 is fixedly connected to an inclined plate 7. The lower surface of the inclined plate 7 is fixedly connected to a second spring 23. One end of the second spring 23 away from the inclined plate 7 is fixedly connected to a limit seat 18, and the limit seat 18 is slidably connected to the inclined plate 7. When the extrusion seat 30 and the fixed seat 8 are fixing the minimally invasive catheter, by using the elasticity of the first spring 22, elasticity can be formed above the inclined plate 7 and the extrusion seat 30. The inclined plate 7 is bent upward so that it can arrange the redundant minimally invasive catheter in an S shape. The inclined plate 7 can be used to extrude the minimally invasive catheter. By using the elasticity of the second spring 23, the limit seat 18 can slide on the surface of the inclined plate 7 to extrude the second spring 23, so that the limit seat 18 can limit and clamp the minimally invasive catheter, and cooperate with the inclined plate 7 to make the minimally invasive catheter better fit the patient's neck. The inner wall of the sliding seat 6 is provided with a rubber rod 29, and the rubber rod 29 is slidably connected to the neck ring 1. The inner wall of the sliding seat 6 is fixedly connected to a hollow tube 28. A ball 27 is movably connected inside the hollow tube 28, and the ball 27 is slidably connected to the neck ring 1. By using the movement of the ball 27, when the sliding seat 6 slides, the ball 27 can roll inside the neck band. By using the rubber rod 29, it can rub against the inside of the neck ring 1. When the sliding seat 6 slides, the rubber rod 29 can be used to increase the friction between the sliding seat 6 and the neck ring 1, so that when the sliding seat 6 is not pushed by an external force, the sliding seat 6 will not slide on the surface of the neck ring 1.

[0032] The lower surface of the neck ring 1 is provided with a first neck band 2. The lower surface of the first neck band 2 is provided with a cloth band 10. The lower surface of the cloth band 10 is provided with an adjustment band 3. The lower surface of the neck ring 1 is provided with a second neck band 5. A soft plate 9 is provided on the side surface of the second neck band 5. A friction rod 4 is provided on the rear surface of the soft plate 9, and the friction rod 4 is fitted with the adjustment band 3. A rubber band 26 is provided on the side surface of the second neck band 5. A strap 25 is provided on the side surface of the rubber band 26. A connecting plate 24 is provided on the side surface of the rubber band 26, and the connecting plate 24 is fixedly connected to the inside of the neck ring 1. The adjustment band 3 is provided with a round hole inside. When the neck ring 1 is worn on the patient's neck, according to the diameter of the patient's neck, the length of the first neck band 2 can be adjusted. Since a cloth band 10 is provided between multiple adjustment bands 3, when the length of the first neck band 2 is adjusted, the orientation of the adjustment band 3 can be adjusted arbitrarily. After the distance between the first neck band 2 and the second neck band 5 is adjusted, the friction rod 4 can be penetrated into the corresponding adjustment band 3. Since the friction rod 4 is made of rubber, when the friction rod 4 penetrates into the inside of the adjustment band 3, the friction between the friction rod 4 and the adjustment band 3 can be increased to fix the adjustment band 3. By using the rubber band 26 and the strap 25, the connection between the second neck band 5 and the neck ring 1 can be elastically arranged, thereby improving the comfort of the device when worn.

[0033] When in use, when the neck ring 1 is worn on the patient's neck, the length of the first neck band 2 can be adjusted according to the patient's neck diameter. Since a cloth belt 10 is provided between the plurality of adjustment belts 3, the orientation of the adjustment belt 3 can be adjusted at will when the length of the first neck band 2 is adjusted. After the spacing between the first neck band 2 and the second neck band 5 is adjusted, the friction rod 4 can be inserted into the corresponding adjustment belt 3. Since the friction rod 4 is made of rubber, the friction rod 4 can increase the friction force between the friction rod 4 and the adjustment belt 3 when passing through the inside of the adjustment belt 3 to fix the adjustment belt 3. During embolization surgery or emergency aneurysm interventional embolization, firstly, an 8F short sheath is inserted through the right femoral artery, and then a triaxial system (8F long sheath, 6F distal access catheter, stent catheter or microcatheter) is placed on the 8F short sheath. During the operation, the 8F long sheath is inserted into the internal carotid artery C2 level, and the position of the slide 6 is adjusted according to the placement position of the minimally invasive catheter by sliding the slide 6 and the neck ring 1. When the position of the slide 6 is adjusted, the movement of the slide sleeve 15 and the movable block 14 is used to place the clamping plate 16 longitudinally, and the engagement of the slide sleeve 15 and the slide rod 12 is used to retract the slide rod 12 into the slide sleeve 15. The clamping plate 16 can be extended from the inside of the slide plate 11 to separate the extrusion seat 30 from the fixing seat 8, so that the minimally invasive catheter can be placed in the groove inside the fixing seat 8. After the minimally invasive catheter is placed, the extrusion seat 30 can be fitted with the upper surface of the fixing seat 8, and the sliding sleeve 15 and the sliding rod 12 can be retracted to extend the sliding rod 12 from the inside of the sliding sleeve 15. The clamping plate 16 can extend through the inside of the slide plate 11 to move the extrusion seat 30 downward, so that the extrusion seat 30 can squeeze the minimally invasive catheter and the airbag 20. When the extrusion seat 30 squeezes the airbag 20, the airbag 20 is affected by the squeezing. The friction pad 13 can be fitted with the surface of the minimally invasive catheter through the expansion of both sides of the airbag 20, and the fixing seat 8, the extrusion seat 30 and the airbag 20 can be used to squeeze the minimally invasive catheter. The elasticity of the first spring 22 can be used to form elasticity between the inclined plate 7 and the top of the extrusion seat 30, and the inclined plate 7 can be bent upward so that the redundant minimally invasive catheters can be arranged in an S shape. The minimally invasive catheters can be squeezed by the inclined plate 7, and the elasticity of the second spring 23 can be used to make the limit seat 18 slide on the surface of the inclined plate 7 to squeeze the second spring 23, so that the limit seat 18 can limit and clamp the minimally invasive catheter.

[0034] 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 minimally invasive catheter fixing and adjusting device for neurointervention, comprising a neck ring (1), characterized in that: The front surface and the rear surface of the neck ring (1) are both slidably connected to a sliding seat (6), the upper surface of the sliding seat (6) is fixedly connected to a fixing seat (8), the upper surface of the fixing seat (8) is provided with a first rubber block (19), and the upper surface of the first rubber block (19) is provided with an air bag (20); The upper surface of the fixed seat (8) is fixedly connected to a slide plate (11), the side surface of the slide plate (11) is fixedly connected to a limit block (17), the interior of the slide plate (11) is slidably connected to a slide rod (12), one end of the slide rod (12) close to the slide plate (11) is fixedly connected to a clamping plate (16), and the clamping plate (16) is engaged with the limit block (17), one end of the slide rod (12) away from the slide plate (11) is sleeved with a slide sleeve (15), the side surface of the slide sleeve (15) is movably connected to a movable block (14), the side surface of the movable block (14) is fixedly connected to an extrusion seat (30), and the lower surface of the extrusion seat (30) is provided with a second rubber block (21).

2. The minimally invasive catheter fixing and adjusting device for neurointervention according to claim 1, characterized in that: A first spring (22) is fixedly connected to the upper surface of the extrusion seat (30), and an end of the first spring (22) away from the extrusion seat (30) is fixedly connected to an inclined plate (7).

3. The minimally invasive catheter fixing and adjusting device for neurointervention according to claim 2, characterized in that: A second spring (23) is fixedly connected to the lower surface of the inclined plate (7), one end of the second spring (23) away from the inclined plate (7) is fixedly connected to a limit seat (18), and the limit seat (18) is slidably connected to the inclined plate (7).

4. The minimally invasive catheter fixing and adjusting device for neurointervention according to claim 1, characterized in that: The inner wall of the sliding seat (6) is provided with a rubber rod (29), and the rubber rod (29) is slidably connected to the neck ring (1); the inner wall of the sliding seat (6) is fixedly connected to a hollow tube (28), and a round ball (27) is movably connected inside the hollow tube (28), and the round ball (27) is slidably connected to the neck ring (1).

5. The minimally invasive catheter fixing and adjusting device for neurointervention according to claim 1, characterized in that: The lower surface of the neck ring (1) is provided with a first neck band (2), the lower surface of the first neck band (2) is provided with a cloth band (10), and the lower surface of the cloth band (10) is provided with an adjustment band (3).

6. The minimally invasive catheter fixing and adjusting device for neurointervention according to claim 1, characterized in that: The lower surface of the neck ring (1) is provided with a second neck band (5), the side surface of the second neck band (5) is provided with a soft plate (9), the rear surface of the soft plate (9) is provided with a friction rod (4), and the friction rod (4) is engaged and connected with the adjustment band (3).

7. The minimally invasive catheter fixing and adjusting device for neurointervention according to claim 6, characterized in that: The side surface of the second neck band (5) is provided with a rubber band (26), and the side surface of the rubber band (26) is provided with a strap (25).

8. The minimally invasive catheter fixing and adjusting device for neurointervention according to claim 7, characterized in that: A connecting plate (24) is provided on the side surface of the rubber band (26), and the connecting plate (24) is fixedly connected to the inside of the neck ring (1).

9. The minimally invasive catheter fixing and adjusting device for neurointervention according to claim 1, characterized in that: The upper surface of the fixing seat (8) and the lower surface of the extrusion seat (30) are both provided with grooves, and a circular hole is provided inside the adjusting belt (3).

10. The minimally invasive catheter fixing and adjusting device for neurointervention according to claim 1, characterized in that: The front surface and the rear surface of the neck ring (1) are both provided with sliding grooves, and the side surface of the airbag (20) is provided with a friction pad (13).

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