Device for probing urethrostenosis after pediatric hypospadias

Abstract

The invention discloses a device for probing urethrostenosis after a child hypospadias operation, and relates to the technical field of medical auxiliary instruments. The device comprises a rod body and a holding rod, one end of the rod body is detachably installed in an inner cavity of the holding rod, a bent part is arranged at the end, away from the holding rod, of the rod body, and a head assembly is arranged on the bent part and the rod body; according to the urethral catheter, the air bag body is arranged at the end of the bent part, the air bag body is inflated through the inflation equipment, the air bag body is expanded, the expansion condition is determined according to the size of the urethral orifice of the penis of a child, and the air bag body enters the urethral orifice and then reaches the bladder, so that the situation that the rod body is high in hardness, and consequently pain is intense when the rod body enters the urethra is avoided; therefore, the pain is reduced; by arranging the urination assembly, generated urine is discharged out of the body through the first urination channel, the second urination channel, the discharge port, the discharge pipe and the urination hose, so that convenient urination under the condition of urethral stricture is conveniently realized, and the recovery cycle of the pediatric hypospadiasis is further prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of medical auxiliary devices, and particularly to a device for detecting urethral stricture after hypospadias surgery in children. Background Art

[0002] Hypospadias is a common congenital malformation of the male lower urinary tract and external genitalia. The urethral orifice is on the ventral side of the penis, proximal to the normal urethral orifice and along the path to the perineum. Most cases are accompanied by penile curvature, which is one of the most common malformations in the pediatric urogenital system.

[0003] After hypospadias surgery in children, a micturition disorder disease caused by increased resistance in the urethra, that is, urethral stricture occurs. The existing technology usually uses a urethral dilator to dilate the strictured urethra. However, the urethral stricture dilator in the existing technology still has some defects:

[0004] 1. When the urethral stricture dilator in the existing technology enters the urethral orifice, since the dilator is usually made of metal, the pain is relatively strong when entering the urethra.

[0005] 2. The urethral stricture dilator in the existing technology is not convenient for blocking the micturition channel. When not urinating, if external air and foreign objects enter, it is easy to cause urethral infection.

[0006] 3. At the same time, for the urethral stricture dilator in the existing technology, its overall length is mostly fixed. During the process of inserting into the urethra of a child, due to the child's restlessness and poor cooperation, the operation of medical staff is relatively inconvenient.

[0007] In view of the above problems, the inventor proposes a device for detecting urethral stricture after hypospadias surgery in children to solve the above problems. Summary of the Invention

[0008] In order to solve the above problems, the purpose of the present invention is to provide a device for detecting urethral stricture after hypospadias surgery in children.

[0009] To solve the above technical problems, the present invention adopts the following technical scheme: A device for detecting urethral stricture after hypospadias surgery in children, the urethral stricture detection device includes a rod body and a grip rod. One end of the rod body is detachably installed in the inner cavity of the grip rod. The end of the rod body far from the grip rod is provided with a bending part. A head assembly is provided on the bending part and the rod body. A micturition assembly is provided on the bending part, the rod body and the grip rod. An opening and closing assembly is provided on the grip rod and the rod body. An adjusting assembly is provided at one end of the grip rod.

[0010] Preferably, the head assembly includes an airbag body, which is elliptical in shape. The airbag body is fixedly arranged at one end of the bent part. There are two chambers inside the airbag body. There are two inflation channels opened inside the rod body. One end of each of the two inflation channels communicates with one of the two chambers. A gas filling pipe is fixedly arranged at one end of the rod body close to the grip. The other ends of the two inflation channels are provided with annular grooves, and one end of the gas filling pipe communicates with the annular grooves.

[0011] Preferably, a lubricating layer is arranged on the outer wall of the airbag body.

[0012] Preferably, the urine discharging assembly includes a second urine discharging channel and a first urine discharging channel. The second urine discharging channel is opened inside the rod body. The first urine discharging channel is opened in the middle of the airbag body. The first urine discharging channel communicates with the second urine discharging channel. A discharge port is opened at one end of the rod body close to the grip. One end of the second urine discharging channel communicates with the discharge port.

[0013] Preferably, a discharge pipe is fixedly arranged on the grip, and the discharge pipe is offset from the discharge port.

[0014] Preferably, a sealing plug is movably inserted into one end of the discharge pipe.

[0015] Preferably, a sealing gasket is fixedly arranged on the inner wall of the grip, and the discharge port corresponds to the sealing gasket.

[0016] Preferably, the opening and closing assembly includes a limiting rod. An insertion hole is opened on the grip. The limiting rod is movably inserted into the insertion hole. Two limiting holes are opened at one end of the rod body close to the grip. One end of the limiting rod is movably inserted into the inner wall of one of the limiting holes.

[0017] Preferably, a U-shaped frame is fixedly arranged on the grip. A movable rod is movably inserted into the middle of the U-shaped frame. One end of the movable rod is fixedly connected to the other end of the limiting rod. A telescopic spring is movably sleeved on the outer wall of the movable rod. One end of the telescopic spring is fixedly connected to the outer wall of the grip, and the other end of the telescopic spring is fixedly connected to the middle of the movable rod.

[0018] Preferably, the adjusting assembly includes an adjusting rod and a fixing rod. One end of the fixing rod is fixedly connected to one end of the grip far from the rod body. The adjusting rod is movably sleeved on the outer wall of the fixing rod;

[0019] An activity cavity is opened at one end of the fixing rod far from the grip. Limiting beads are arranged at both ends of the activity cavity. A number of uniformly distributed limiting grooves are opened on the adjusting rod. The limiting beads are in movable contact with the inner wall of the limiting grooves;

[0020] A fixing plate is fixedly arranged in the middle of the movable cavity. Z-shaped elastic members are fixedly arranged on both the upper and lower surfaces of the fixing plate, and one end of each Z-shaped elastic member is fixedly connected to the bottom of a limiting bead.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1. In the present invention, by arranging an air bag body at the end of the bent part and inflating the air bag body through an inflation device, the air bag body expands. The expansion situation is determined according to the size of the urethral orifice of the child's penis. As the air bag body enters the urethral orifice and then reaches the bladder, it avoids the strong pain caused by the hard rod body when entering the urethra, thereby reducing the pain.

[0023] 2. In the present invention, by arranging a urine drainage component, the generated urine is discharged to the outside through the first urine drainage channel, the second urine drainage channel, the discharge port, the discharge pipe and the urine drainage hose, thus conveniently realizing convenient urine drainage in the case of urethral stricture, and further shortening the recovery period of the pediatric hypospadias surgery.

[0024] 3. In the present invention, by arranging an opening and closing component, the opening and closing component can block the discharge port or make the discharge port correspond to the discharge pipe, thereby realizing the opening and closing of the urine drainage component. When not urinating, it avoids external air or foreign objects from entering and prevents urethral infection.

[0025] 4. In the present invention, by arranging an adjusting component, the adjusting rod moves on the fixed rod and the position of the adjusting rod is limited and fixed, thus conveniently realizing the adjustment of the overall length of the device for urethral stricture, making the overall length of the device for urethral stricture reach the length convenient for medical staff to operate, and further improving the operation convenience. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0027] Figure 1 It is a schematic diagram of the composition structure of a device for detecting urethral stricture after pediatric hypospadias surgery according to the present invention.

[0028] Figure 2 It is an exploded structure schematic diagram of a device for detecting urethral stricture after pediatric hypospadias surgery according to the present invention.

[0029] Figure 3 For the present invention Figure 2 The enlarged schematic diagram of part A.

[0030] Figure 4 For the present invention Figure 2 Schematic enlarged view of part B in the present invention

[0031] Figure 5 For the present invention Figure 4 Schematic enlarged view of part C in the present invention

[0032] Figure 6 For the present invention Figure 2 Schematic enlarged view of part D in the present invention

[0033] In the figure: 1. Rod body; 11. Bent part; 2. Grip bar; 3. Head assembly; 31. Airbag body; 33. Chamber; 34. Lubricating layer; 35. Inflation channel; 36. Inflation tube; 37. Annular groove; 4. Urination assembly; 41. Second urination channel; 42. First urination channel; 43. Discharge port; 44. Discharge pipe; 45. Sealing plug; 46. Sealing gasket; 5. Opening and closing assembly; 51. Limit rod; 52. Insertion hole; 53. U-shaped frame; 54. Movable rod; 56. Telescopic spring; 57. Limit hole; 6. Adjusting assembly; 61. Adjusting rod; 62. Fixed rod; 63. Movable cavity; 64. Limit bead; 65. Limit groove; 66. Fixed plate; 67. Z-shaped elastic member Specific embodiments

[0034] 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 of 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

[0035] Embodiment: As Figure 1-6As shown in the figure, the present invention provides a device for detecting urethral stricture after hypospadias repair in children. The urethral stricture detection device includes a rod body 1 and a grip rod 2. One end of the rod body 1 is detachably installed in the inner cavity of the grip rod 2. A bent portion 11 is provided at the end of the rod body 1 away from the grip rod 2. By providing the bent portion 11, the bent portion 11 can enter the bladder, so that the whole rod body 1 enters the urethra. A head assembly 3 is provided on the bent portion 11 and the rod body 1. By providing the head assembly 3, the head assembly 3 can reduce the hardness when entering the urethra, thereby reducing the pain. A urine drainage assembly 4 is provided on the bent portion 11, the rod body 1 and the grip rod 2. By providing the urine drainage assembly 4, when the rod body 1 enters the interior of the urethra, the urine drainage assembly 4 can achieve automatic urine drainage, avoiding the inability to urinate due to urethral stricture after hypospadias repair in children. An opening and closing assembly 5 is provided on the grip rod 2 and the rod body 1. By providing the opening and closing assembly 5, the opening and closing assembly 5 can control the opening and closing of the urine drainage assembly 4. When not urinating, it can prevent external air from entering and avoid infection. When urinating, controlling the opening of the urine drainage assembly 4 can achieve urine drainage. An adjusting assembly 6 is provided at one end of the grip rod 2. By providing the adjusting assembly 6, the adjusting assembly 6 can adjust the overall length of the urethral stricture detection device, thereby avoiding the problem of inconvenient operation for medical staff due to the restlessness of children.

[0036] The head assembly 3 includes an airbag body 31. The airbag body 31 is elliptical. The airbag body 31 is fixedly arranged at one end of the bent portion 11. Two chambers 33 are provided inside the airbag body 31. Two air inflation channels 35 are opened inside the rod body 1. One ends of the two air inflation channels 35 are communicated with the two chambers 33. By providing the chambers 33 and the air inflation channels 35, when gas enters the interior of the air inflation channels 35, the gas enters the chambers 33 through the air inflation channels 35. The gas causes the airbag body 31 to expand inside the chambers 33. A gas filling pipe 36 is fixedly arranged at the end of the rod body 1 close to the grip rod 2. The other ends of the two air inflation channels 35 are provided with annular grooves 37. One end of the gas filling pipe 36 is communicated with the annular grooves 37. By providing the gas filling pipe 36 and the annular grooves 37, when an inflation device is connected to the gas filling pipe 36, the gas enters the two air inflation channels 35 through the gas filling pipe 36 and the annular grooves 37.

[0037] A lubricating layer 34 is provided on the outer wall of the airbag body 31. By providing the lubricating layer 34, applying lubricating oil on the lubricating layer 34 can improve the lubricating performance of the airbag body 31, thereby improving the smoothness of the airbag body 31 when entering the urethra.

[0038] The urine discharging assembly 4 includes a second urine discharging channel 41 and a first urine discharging channel 42. The second urine discharging channel 41 is opened inside the rod body 1, and the first urine discharging channel 42 is opened in the middle of the airbag body 31. The first urine discharging channel 42 is communicated with the second urine discharging channel 41. One end of the rod body 1 close to the grip rod 2 is provided with a discharge port 43, and one end of the second urine discharging channel 41 is communicated with the discharge port 43. By setting the first urine discharging channel 42, the second urine discharging channel 41 and the discharge port 43, after the airbag body 31 enters the inside of the bladder, the generated urine is discharged outward through the first urine discharging channel 42, the second urine discharging channel 41 and the discharge port 43.

[0039] A discharge pipe 44 is fixedly arranged on the grip rod 2, and the discharge pipe 44 is offset from the discharge port 43. By setting the discharge pipe 44, when an external urine discharging hose is sleeved on the end of the discharge pipe 44, and when the discharge pipe 44 corresponds to the discharge port 43, the urine is discharged out of the body through the discharge pipe 44.

[0040] A sealing plug 45 is movably inserted into one end of the discharge pipe 44. By setting the sealing plug 45, when not discharging urine, the sealing plug 45 can block the discharge pipe 44 to prevent external air or foreign objects from entering.

[0041] A sealing gasket 46 is fixedly arranged on the inner wall of the grip rod 2, and the discharge port 43 corresponds to the sealing gasket 46. By setting the sealing gasket 46, when not discharging urine, the sealing gasket 46 can seal the discharge port 43 to prevent a small amount of urine from overflowing.

[0042] The opening and closing assembly 5 includes a limiting rod 51. An insertion hole 52 is opened on the grip rod 2, and the limiting rod 51 and the insertion hole 52 are movably inserted. Two limiting holes 57 are opened at one end of the rod body 1 close to the grip rod 2, and one end of the limiting rod 51 is movably inserted into the inner wall of one of the limiting holes 57. By setting the limiting rod 51 and the two limiting holes 57, when the limiting rod 51 is inserted into one of the limiting holes 57, the discharge port 43 is offset from the discharge pipe 44, and when the limiting rod 51 is inserted into the other limiting hole 57, the discharge port 43 corresponds to the discharge pipe 44, and urine discharging can be realized.

[0043] A U-shaped frame 53 is fixedly arranged on the grip rod 2. A movable rod 54 is movably inserted into the middle of the U-shaped frame 53. One end of the movable rod 54 is fixedly connected to the other end of the limiting rod 51. A telescopic spring 56 is movably sleeved on the outer wall of the movable rod 54. One end of the telescopic spring 56 is fixedly connected to the outer wall of the grip rod 2, and the other end of the telescopic spring 56 is fixedly connected to the middle of the movable rod 54. By setting the movable rod 54 and the telescopic spring 56, in the default state, the telescopic spring 56 makes the limiting rod 51 inserted into the limiting hole 57 through the movable rod 54. When the movable rod 54 is pulled upward, the movable rod 54 moves upward, causing the telescopic spring 56 to contract, and the limiting rod 51 can be separated from the limiting hole 57. At this time, the grip rod 2 can slide at one end of the rod body 1.

[0044] The adjusting assembly 6 includes an adjusting rod 61 and a fixing rod 62. One end of the fixing rod 62 is fixedly connected to the end of the grip rod 2 away from the rod body 1. The adjusting rod 61 is movably sleeved on the outer wall of the fixing rod 62. By arranging the adjusting rod 61 that can slide on the fixing rod 62, when the adjusting rod 61 slides on the fixing rod 62, the overall length of the device for urethral stricture can be adjusted, so that the overall length of the device for urethral stricture reaches a length that is convenient for medical personnel to operate.

[0045] An active cavity 63 is provided at one end of the fixed rod 62 away from the grip rod 2, and limiting beads 64 are provided at both ends of the active cavity 63. A plurality of evenly distributed limiting grooves 65 are provided on the adjusting rod 61, and the limiting beads 64 are in active contact with the inner walls of the limiting grooves 65. By providing the active cavity 63, the limiting beads 64 and the limiting grooves 65, the limiting beads 64 can slide and shrink in the active cavity 63. When the limiting beads 64 enter the limiting grooves 65, the position of the adjusting rod 61 can be limited and fixed by the limiting grooves 65. When the push-pull adjusting rod 61 moves on the fixed rod 62, the push-pull force can cause the limiting beads 64 to separate from the limiting grooves 65 and enter the active cavity 63, so as to achieve the purpose of convenient adjustment of the adjusting rod 61.

[0046] A fixing plate 66 is fixedly provided in the middle of the movable cavity 63, and a Z-shaped elastic member 67 is fixedly provided on the upper and lower surfaces of the fixing plate 66. One end of the Z-shaped elastic member 67 is fixedly connected to the bottom of the limiting bead 64. By setting the Z-shaped elastic member 67, in the process of pushing and pulling the adjusting rod 61, the pushing and pulling force causes the limiting bead 64 to separate from the limiting groove 65, and the limiting bead 64 enters the movable cavity 63. The limiting bead 64 simultaneously contracts the Z-shaped elastic member 67. When the limiting bead 64 corresponds to other limiting grooves 65, the extension of the Z-shaped elastic member 67 can push the limiting bead 64 into the corresponding limiting groove 65, so that the moved adjusting rod 61 can be limited and fixed.

[0047] Working principle: When urethral stenosis occurs after hypospadias surgery for children, first, according to the age and cooperation of the child, the medical staff pushes and pulls the adjusting rod 61, and the adjusting rod 61 moves on the fixing rod 62. At the same time, the force generated by the movement of the adjusting rod 61 causes the two limiting beads 64 to disengage from the corresponding two limiting grooves 65, and the two limiting beads 64 enter the active cavity 63, and the two Z-shaped elastic members 67 contract. When the adjusting rod 61 moves to the specified position, and the two limiting beads 64 correspond vertically to the other two limiting grooves 65, at this time, the extension of the two Z-shaped elastic members 67 pushes the two limiting beads 64 into the corresponding two limiting grooves 65, and the moved adjusting rod 61 is limited and fixed, thereby conveniently realizing the overall length adjustment of the device for urethral stenosis, so that the overall length of the device for urethral stenosis reaches the length that is convenient for medical staff to operate, thereby improving the convenience of operation;

[0048] Subsequently, medical staff connect the trachea of the inflating device to the inflating tube 36. The gas generated by the operation of the inflating device enters the two chambers 33 through the inflating tube 36, the annular groove 37, and the two inflating channels 35. The gas entering the two chambers 33 causes the airbag body 31 to expand. The degree of expansion is determined according to the size of the urethral orifice of the child's penis. Then, lubricating oil is applied to the lubricating layer 34. Next, hold the grip rod 2 by hand and align the airbag body 31 with the urethral orifice. The airbag body 31 enters the urethral orifice and reaches the bladder. At this time, the rod body 1 enters the urethra, and the grip rod 2 is outside, avoiding strong pain when entering the urethra due to the relatively hard hardness of the rod body 1, thereby reducing the pain;

[0049] When the child needs to urinate, the medical staff or the caregiver pulls the movable rod 54. The movable rod 54 causes the limit rod 51 to disengage from one of the limit holes 57. Then, manually pull the grip rod 2, and the grip rod 2 moves toward the end close to the rod body 1. When the limit rod 51 is vertically aligned with the other limit hole 57, the discharge port 43 is vertically aligned with the discharge pipe 44. Then, release the movable rod 54. Under the action of the telescopic spring 56, the movable rod 54 and the limit rod 51 move downward, and the limit rod 51 is vertically inserted into the other limit hole 57 to limit and fix the position of the moved grip rod 2. Then, remove the sealing plug 45, and then put the urine drainage hose on the end of the discharge pipe 44. The generated urine is discharged to the outside through the first urine drainage channel 42, the second urine drainage channel 41, the discharge port 43, the discharge pipe 44, and the urine drainage hose, thus conveniently realizing convenient urination in the case of urethral stricture, and further shortening the recovery period of the pediatric hypospadias surgery.

[0050] Obviously, those skilled in the art can make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and its equivalent technologies, the present invention is also intended to include these modifications and variations. It should be noted that there is an error in the original text. The correct expression should be "shortening the recovery period" instead of "improving the recovery period" in the translation of paragraph ID=4.

Claims

1. A device for detecting urethral stricture after hypospadias surgery in children, characterized in that: The device for urethral stricture comprises a rod body (1) and a grip rod (2); one end of the rod body (1) is detachably mounted in the inner cavity of the grip rod (2); one end of the rod body (1) away from the grip rod (2) is provided with a bending portion (11); the bending portion (11) and the rod body (1) are provided with a head assembly (3); the bending portion (11), the rod body (1) and the grip rod (2) are provided with a urination assembly (4); the grip rod (2) and the rod body (1) are provided with an opening and closing assembly (5); and one end of the grip rod (2) is provided with an adjustment assembly (6).

2. A device for detecting urethral stricture after hypospadias surgery in children as claimed in claim 1, characterized in that: The head assembly (3) comprises an airbag body (31) which is elliptical in shape and fixedly arranged at one end of the bent portion (11). Two chambers (33) are arranged inside the airbag body (31). Two inflation channels (35) are arranged inside the rod body (1). One end of the two inflation channels (35) is connected to the two chambers (33). An inflation tube (36) is fixedly arranged at one end of the rod body (1) close to the grip (2). An annular groove (37) is arranged at the other end of the two inflation channels (35). One end of the inflation tube (36) is connected to the annular groove (37).

3. A device for detecting urethral stricture after hypospadias surgery in children as claimed in claim 2, characterized in that: The outer wall of the airbag body (31) is provided with a lubricating layer (34).

4. A device for detecting urethral stricture after hypospadias surgery in children as claimed in claim 2, characterized in that: The urination component (4) comprises a second urination channel (41) and a first urination channel (42); the second urination channel (41) is provided inside the rod body (1); the first urination channel (42) is provided in the middle of the airbag body (31); the first urination channel (42) is communicated with the second urination channel (41); an end of the rod body (1) close to the grip (2) is provided with an outlet (43); one end of the second urination channel (41) is communicated with the outlet (43).

5. A device for detecting urethral stricture after hypospadias surgery in children as claimed in claim 4, characterized in that: A discharge pipe (44) is fixedly arranged on the grip rod (2), and the discharge pipe (44) is staggered from the discharge outlet (43).

6. A device for detecting urethral stricture after hypospadias surgery in children as claimed in claim 5, characterized in that: A sealing plug (45) is movably inserted into one end of the discharge pipe (44).

7. A device for detecting urethral stricture after hypospadias surgery in children as claimed in claim 4, characterized in that: A sealing gasket (46) is fixedly provided on the inner wall of the grip rod (2), and the discharge port (43) corresponds to the sealing gasket (46).

8. The device for detecting urethral stricture after hypospadias surgery in children as claimed in claim 1, characterized in that: The opening and closing assembly (5) comprises a limiting rod (51), the handle bar (2) is provided with an insertion hole (52), the limiting rod (51) and the insertion hole (52) are movably plugged, one end of the rod body (1) close to the handle bar (2) is provided with two limiting holes (57), and one end of the limiting rod (51) is movably plugged with the inner wall of one of the limiting holes (57).

9. A device for detecting urethral stricture after hypospadias surgery in children as claimed in claim 8, characterized in that: A U-shaped frame (53) is fixedly arranged on the gripping rod (2), a movable rod (54) is movably inserted in the middle of the U-shaped frame (53), one end of the movable rod (54) is fixedly connected to the other end of the limiting rod (51), a telescopic spring (56) is movably sleeved on the outer wall of the movable rod (54), one end of the telescopic spring (56) is fixedly connected to the outer wall of the gripping rod (2), and the other end of the telescopic spring (56) is fixedly connected to the middle of the movable rod (54).

10. The device for detecting urethral stricture after hypospadias surgery in children as claimed in claim 1, characterized in that: The adjustment assembly (6) comprises an adjustment rod (61) and a fixing rod (62), one end of the fixing rod (62) is fixedly connected to an end of the grip rod (2) away from the rod body (1), and the adjustment rod (61) is movably sleeved on the outer wall of the fixing rod (62); An active cavity (63) is formed at one end of the fixing rod (62) away from the grip rod (2), and limiting beads (64) are provided at both ends of the active cavity (63). A plurality of evenly distributed limiting grooves (65) are formed on the adjusting rod (61), and the limiting beads (64) are in active contact with the inner walls of the limiting grooves (65); A fixing plate (66) is fixedly arranged in the middle of the movable cavity (63), and a Z-shaped elastic member (67) is fixedly arranged on the upper and lower surfaces of the fixing plate (66), and one end of the Z-shaped elastic member (67) is fixedly connected to the bottom of the limiting bead (64).

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