An appendiceal orifice support device for endoscopic retrograde appendectomy

Abstract

The application relates to the field of medical instruments, and provides an appendix orifice supporting device for endoscopic retrograde appendix treatment, which comprises a support head, a support base, an unfolding piece, a first direction line, a second direction line and an opening and closing piece. A channel is arranged on a colonoscope. The support base is arranged around the front end of the colonoscope. The unfolding piece is arranged in at least three groups and is arranged in sequence along the support base. The opening and closing piece is located in the channel and is divided into a pushing end and a connecting end. The pushing end is located outside the colonoscope. When the pushing end is pushed, the connecting end moves along the channel and extends out of the channel. The support head is an elastic structure with expansion characteristics, and the bottom is connected with the connecting end and the unfolding piece. The application has the advantages of conveniently providing support for the appendix orifice and providing the effect of extending a sub-scope into the appendix cavity for shooting, exploration and treatment on the basis of facilitating colonoscope treatment.

Description

Technical Field

[0001] This application relates to the field of medical devices, and in particular to an appendiceal orifice support device for endoscopic retrograde appendectomy. Background Technology

[0002] Acute appendicitis is one of the most common acute abdominal conditions, with the highest incidence in children and young adults. Fecal impaction is the most common cause. Treatment for appendicitis generally involves conservative medication or surgical removal. Conservative medication carries the risk of recurrent appendicitis, while surgical removal is more thorough. However, the appendix is ​​not "dispensable." It participates in intestinal immunity, helps maintain intestinal flora balance, promotes intestinal motility, and improves constipation. In recent years, with the development of digestive endoscopy technology, endoscopic retrograde appendectomy (ERAT) has made non-surgical, non-invasive treatment of appendicitis possible.

[0003] Endoscopic retrograde appendectomy (ERAT) is a minimally invasive endoscopic technique that involves inserting a colonoscope into the rectum through the anus and retrogradely to the appendiceal orifice at the ileocecal junction. A smaller subscope is then inserted into the appendiceal lumen through a forceps channel. The physician can observe and manipulate the subscope through a monitor while it enters the appendiceal lumen to perform cleaning, drainage of pus, removal of fecaliths, or other treatments. It is used to treat acute appendicitis or appendix-related diseases.

[0004] The appendix orifice is obstructed by crescent-shaped mucosal folds, making it time-consuming and laborious to adjust the angle of the endoscope tip when it enters. Moreover, the endoscope needs to enter and exit multiple times to complete operations such as fecalith removal when necessary. Therefore, the appendix orifice support device designed in this application for endoscopic retrograde appendectomy is used to open the appendix orifice folds, which facilitates the entry and exit of the endoscope into the appendix lumen and has important clinical practicality. Summary of the Invention

[0005] To address the aforementioned issues, this application provides an appendiceal orifice support device for endoscopic retrograde appendectomy.

[0006] The appendiceal orifice support device for endoscopic retrograde appendectomy provided in this application adopts the following technical solution:

[0007] An appendiceal orifice support device for endoscopic retrograde appendectomy, applied to a colonoscope, includes a stent head, a stent base, an unfolding member, a first direction line, a second direction line, and an opening / closing member; the colonoscope has a forceps channel; the stent base is mounted around the front end of the colonoscope; at least three sets of unfolding members are arranged sequentially along the stent base; the opening / closing member is located within the forceps channel and is divided into a pushing end and a connecting end; the pushing end is located outside the colonoscope, and when pushed, the connecting end moves along the forceps channel and extends out of the forceps channel; the stent head is an elastic structure with expansion characteristics, and its bottom is connected to the connecting end and the unfolding member; the first direction line and the second direction line are respectively connected to both sides of the stent head, and the connection heights of the first direction line and the second direction line are different.

[0008] By employing the above technical solution, medical staff pull the pushing end of the opening and closing mechanism, causing the stent head to retract into the clamp channel. At this time, at least three sets of unfolding components are in a relaxed or loose state, making it convenient for medical staff to push the colonoscope from the patient's anus into the rectum, finally reaching the appendix orifice. Then, the pushing end is pushed, causing the stent head and unfolding components to extend out of the clamp channel. Afterward, medical staff pull the first and second direction lines to control and adjust the position and direction of the top of the stent head. By using the swinging stent head and manipulating the colonoscope to advance and retreat, the crescent-shaped mucosal folds at the appendix orifice are opened. Finally, the size of the elastic mesh tube fixing the stent head is adjusted by manipulating the opening and closing mechanism and the fixing component of the stent head, thereby providing support for the appendix orifice, facilitating the entry and exit of the sub-scope into the appendix lumen, and ensuring that the sub-scope can stably image, explore, and perform related treatments on the appendix.

[0009] Optionally, the first direction line and the second direction line are located within the clamp channel and extend from the clamp channel opening provided with the opening and closing member push end.

[0010] By adopting the above technical solution, the first direction line and the second direction line are pulled by the clamp channel to pull the bracket head, which can facilitate the concealment of the first direction line and the second direction line and facilitate unified control.

[0011] Optionally, the unfolding component includes a metal chain, and the metal chain is connected to the support base and the support head in a movable manner.

[0012] By adopting the above technical solution, the metal chain can be easily connected to the support base and support head, and some of them can even follow the support head into the clamp channel for concealment.

[0013] Optionally, the surface of the metal chain is provided with an adhesive layer.

[0014] By adopting the above technical solution, the adhesive layer provides metal chain wrapping, which protects the colon wall and prevents the metal chain from scratching the intestine or damaging the colonoscope.

[0015] Optionally, the metal chain is composed of several metal rings that are nested together, and a snap-fit ​​structure is provided between adjacent metal rings.

[0016] By adopting the above technical solution, the metal rings are interlocked, which makes the metal chain highly mobile and allows it to swing or shift in any direction. At the same time, the buckle structure can fix the position of the metal rings and provide a certain support effect.

[0017] Optionally, the buckle structure includes a plastic buckle; one end of the metal ring is provided with the plastic buckle, and the other end is provided with a buckle hole, and adjacent metal rings are engaged with the buckle and the buckle hole through the plastic buckle.

[0018] By adopting the above technical solution, the plastic buckle has a certain degree of plasticity and elasticity, which allows it to retract and snap into the buckle hole when compressed. The plastic buckle snapped into the buckle hole will fix the position of the metal ring, so that the metal ring can no longer be bent or moved. This method can fix the position of adjacent metal rings, so as to provide support for the colon wall around the appendix orifice.

[0019] Optionally, the unfolding element includes a flexible, transparent plastic strip with blunted edges.

[0020] By adopting the above technical solution, when the opening and closing component is pulled from the outside, the support head is close to the front end of the colonoscope. When it is released, the transparent plastic strip springs open to act as a support frame due to the material properties of the plastic. This method can achieve the purpose of opening and closing the support head by pulling the opening and closing component from the outside. At the same time, the transparent material has less impact on the field of vision, reducing the obstruction of the field of vision of the front cameras of both the colonoscope and the sub-scope.

[0021] Optionally, the support head is a rotatable opening and closing structure, including an elastic mesh cylinder and a fixing member; the surface of the opening and closing member is provided with internal threads, and the fixing member is provided with external threads; the fixing member is located inside the opening and closing member and is screwed to the opening and closing member; the fixing member has elasticity and toughness, and swings when the support head is pulled by the first direction line and the second direction line; one end of the elastic mesh cylinder is pivotally connected to the opening and closing member, and the other end is connected to the fixing member.

[0022] By adopting the above technical solution, the opening and closing parts and the fixing parts are connected by screws, so as to conveniently control the expansion or retraction of the elastic mesh cylinder, thereby controlling the size of the elastic mesh cylinder opening and adapting to different appendiceal orifices and appendiceal cavities.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. Medical staff pull the push end of the opening and closing mechanism to retract the stent head into the clamp channel. At this time, at least three sets of unfolding parts are in a relaxed or loose state, which makes it easier for medical staff to push the colonoscope from the patient's anus into the rectum and finally to the appendix orifice. Then, push the push end to extend the stent head and unfolding parts out of the clamp channel. After that, medical staff pull the first direction line and the second direction line to control and adjust the position and direction of the top of the stent head. By swinging the stent head and manipulating the colonoscope to advance and retreat, the crescent-shaped mucosal folds at the appendix orifice are opened. Finally, the opening and closing mechanism and the fixing part of the stent head are operated to adjust the size of the elastic mesh tube that fixes the stent head, thereby providing support for the appendix orifice, facilitating the entry and exit of the sub-scope into the appendix lumen, and ensuring that the sub-scope can stably image, explore and treat the appendix.

[0025] 2. The first and second direction lines are pulled by the clamps to pull the bracket head, which can easily conceal the first and second direction lines and facilitate unified control;

[0026] 3. The metal chain can be easily connected to the support base and support head, and some can even be hidden in the clamp channel along with the support head;

[0027] 4. The adhesive layer provides metal chain wrapping to protect the colon wall and prevent the metal chain from scratching the intestines or damaging the colonoscope. Attached Figure Description

[0028] Figure 1 This is a three-dimensional structural schematic diagram of the support device in one embodiment of this application;

[0029] Figure 2 This is a three-dimensional structural schematic diagram of some unfolded parts in some embodiments of this application;

[0030] Figure 3 This is a three-dimensional structural schematic diagram of the changing state of the support head in some embodiments of this application;

[0031] The labels in the attached diagram are as follows: 1. Colonoscope, 11. Forceps channel, 2. Stent head, 21. Elastic mesh tube, 22. Fixing component, 3. Stent base, 4. Deployment component, 41. Metal chain, 411. Metal ring, 412. Plastic buckle, 413. Clip hole, 5. First direction line, 6. Second direction line, 7. Opening and closing component. Detailed Implementation

[0032] The following specific examples illustrate the implementation methods of this application. Those skilled in the art can easily understand other advantages and effects of this application from the information disclosed herein. This application can also be implemented or applied through other different specific embodiments, and various details in this application can be modified or changed according to different viewpoints and application systems without departing from the spirit of this application. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0033] The embodiments of this application will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can easily implement the application. This application may be embodied in many different forms and is not limited to the embodiments described herein.

[0034] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics represented in connection with that embodiment or example, which are included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics represented may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate different embodiments or examples represented in this application, as well as features of different embodiments or examples.

[0035] Furthermore, the terms "first" and "second" are used only to indicate an objective and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the representation of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0036] Throughout this specification, when it is said that a device is "connected" to another device, this includes not only "direct connection" but also "indirect connection" by placing other components in between. Furthermore, when it is said that a device "comprises" a certain constituent element, unless otherwise stated otherwise, this does not exclude other constituent elements, but rather implies that other constituent elements may be included.

[0037] The following is in conjunction with the appendix Figure 1 - Appendix Figure 3 This application will be described in further detail below.

[0038] This application discloses an appendiceal orifice support device for endoscopic retrograde appendectomy.

[0039] An appendiceal orifice support device for endoscopic retrograde appendectomy is applied to a colonoscope 1 and installed on the colonoscope 1. It follows the colonoscope 1 from the patient's anus into the patient's appendix to treat the appendix. The colonoscope 1 includes a body and a camera.

[0040] refer to Figure 1 As shown, it includes a support head 2, a support base 3, an unfolding component 4, a first direction line 5, a second direction line 6, and an opening and closing component 7; the colonoscope 1 has a channel 11, which extends from one end of the colonoscope 1 to the other end. The channel 11 has the effect of connecting the colonoscope 1. When the colonoscope 1 enters the anus to the appendix, other components, such as sub-scopes or other tools, can be inserted through the channel 11.

[0041] The support base 3 has a ring-shaped structure and is installed around the front end of the colonoscope 1 to provide support.

[0042] At least three sets of unfolding components 4 are provided and installed sequentially along the support base 3. The unfolding components 4 have the effect of unfolding and retracting. After being supported by the support base 3, they can be unfolded to provide support for the intestine, so that the colonoscope 1 can take pictures of the inside of the colon in a sufficient space. Setting at least three sets of unfolding components 4 can achieve spatial stability during unfolding and improve the stability of the support.

[0043] At the same time, the unfolding part 4 increases the distance between the front end of the colonoscope 1 and the stent head 2, which makes it easier for the camera at the front end of the colonoscope 1 to transmit real-time images of the stent head 2 supporting the appendix orifice and the insertion and exit of the sub-scope for appendix diagnosis and treatment, which is conducive to rapid and accurate treatment.

[0044] The opening and closing component 7 is located inside the forceps channel 11 and is divided into a pushing end and a connecting end. The opening and closing component 7 can adopt a rod-shaped structure or a tubular structure, such as an opening and closing rod, an opening and closing strip, or an opening and closing tube, depending on the needs. The material can be metal or plastic, and it has a certain degree of elasticity and toughness to meet the requirement of being able to bend in the intestine along with the colonoscope 1. The connecting end of the opening and closing component 7 is connected to the support head 2 and can extend from inside the forceps channel 11 to the patient's appendix orifice. Its pushing end can be equipped with a pull ring to facilitate medical staff to push and pull.

[0045] The push end is located outside the colonoscope 1, that is, outside the patient's anus, for medical staff to push or pull. When the push end is pushed, the opening and closing element 7 moves along the clamp channel 11 until the connecting end moves along the clamp channel 11 and extends out of the clamp channel 11.

[0046] The stent head 2 is an elastic structure with expansion characteristics. The stent head 2 can be expanded or reduced by expansion characteristics. It can adopt a structure similar to a vascular stent. The bottom of the stent head 2 is connected to the opening and closing part 7 and the unfolding part 4. Therefore, when the connecting end is pushed by the pushing end and moves away from the clamping channel 11, the unfolding part 4 unfolds with the connecting end, and the stent head 2 unfolds. The appendix orifice is supported by further operation and adjustment.

[0047] The first direction line 5 and the second direction line 6 are respectively connected to both sides of the stent head, and the connection heights of the first direction line 5 and the second direction line 6 are different. The ends of the first direction line 5 and the second direction line 6 away from the stent head 2 are located outside the colonoscope 1, that is, outside the patient's anus. The first direction line 5 and the second direction line 6 are used to adjust the position of the stent head 2. Medical staff pull the first direction line 5 and the second direction line 6 to change the position and direction of the top of the stent head 2. By swinging the stent head 2 and operating the colonoscope 1 to move it forward and backward, the crescent-shaped mucosal folds at the appendix orifice are opened. Finally, the opening and closing parts 7 and the fixing parts 22 of the stent head 2 are operated to adjust the size of the elastic mesh tube 21 that fixes the stent head 2, thereby providing support for the appendix orifice and facilitating the entry and exit of the endoscope into the appendix cavity.

[0048] Specifically, medical staff pull the pushing end of the opening and closing component 7, causing the stent head 2 to retract into the clamp channel 11. At this time, at least three sets of unfolding components 4 are in a relaxed or loose state, making it convenient for medical staff to push the colonoscope 1 from the patient's anus into the rectum, and finally to the appendix orifice. Then, the pushing end is pushed, causing the stent head 2 and unfolding components 4 to extend out of the clamp channel 11. Afterwards, medical staff pull the first direction line 5 and the second direction line 6 to control and adjust the position and direction of the top of the stent head 2. By using the swinging stent head 2 and manipulating the colonoscope 1 to move forward and backward, the crescent-shaped mucosal folds at the appendix orifice are opened. Finally, the opening and closing component 7 and the fixing component 22 of the stent head 2 are operated to adjust the size of the elastic mesh 21 that fixes the stent head 2, thereby providing support for the appendix orifice, facilitating the entry and exit of the sub-scope into the appendix lumen, and ensuring that the sub-scope can stably image, explore, and treat the appendix.

[0049] Further reference Figure 1 As shown, the first direction line 5 and the second direction line 6 are located inside the clamp channel 11 and extend from the opening of the clamp channel 11 with the opening and closing member 7 pushing end. The first direction line 5 and the second direction line 6 pull the support head 2 through the clamp channel 11, which can facilitate the concealment of the first direction line 5 and the second direction line 6 and facilitate unified control.

[0050] The first directional line 5 and the second directional line 6 can be made of non-metallic materials such as surgical sutures, or metal sutures. When metal sutures are used, they need to be glued to protect the intestinal wall and colonoscope 1.

[0051] On the other hand, the first direction line 5 and the second direction line 6 can also be set outside the colonoscope 1, with only the opening and closing member 7 located inside the forceps channel 11. This method can prevent the first direction line 5, the second direction line 6 and the opening and closing member 7 from getting tangled together. This method can open a perforation port on the surface of the colonoscope 1 to allow the first direction line 5 and the second direction line 6 to pass through for guidance.

[0052] In some embodiments, reference Figure 1 and Figure 2As shown, the unfolding component 4 includes a metal chain 41. The metal chain 41 is connected to the support base 3 and the support head 2 in a movable manner. The movable connection allows the metal chain 41 to be loosened at will, so that part of it can be hidden in the clamp channel 11 along with the support head 2. When unfolding, it can also be unfolded along with the opening and closing component 7.

[0053] Furthermore, the surface of the metal chain 41 is provided with an adhesive layer, which provides a wrapping for the metal chain 41 and protects the colon wall, preventing the metal chain 41 from scratching the intestine or damaging the colonoscope 1.

[0054] Furthermore, refer to Figure 2 As shown, the metal chain 41 is composed of several metal rings 411 that are nested together and connected to each other. There is a buckle structure between adjacent metal rings 411. By nesting the metal rings 411 together, the metal chain 41 has strong freedom of movement and can swing or shift in any direction. At the same time, the buckle structure can fix the position of the metal rings 411 and provide a certain support effect.

[0055] Furthermore, the buckle structure includes a plastic buckle 412. One end of the metal ring 411 has a plastic buckle 412, and the other end has a buckle hole 413. When all the metal rings 411 are taut, the plastic buckles 412 of the adjacent metal rings 411 will align with the buckle holes 413, so that the plastic buckles 412 and the buckle holes 413 are engaged. The plastic buckles 412 have a certain degree of plasticity and elasticity, so that they can retract and be inserted into the buckle holes 413 when compressed. The plastic buckles 412 inserted into the buckle holes 413 will fix the position of the metal rings 411, so that the metal rings 411 can no longer be bent or move. This method can fix the position of the adjacent metal rings 411 to provide support for the colon wall. When it is necessary to retract, a force that can disengage the plastic buckles 412 from the buckle holes 413 can be applied to disengage the plastic buckles 412 from the buckle holes 413.

[0056] In another embodiment, the unfolding member 4 includes a flexible transparent plastic strip with blunted edges. The blunted edges make the contact between the transparent plastic strip and the colon wall softer, avoiding scratching the colon wall. When the unfolding member 4 uses a flexible transparent plastic strip, when the opening and closing member 7 is pulled from the outside, the support head 2 is close to the front end of the colonoscope 1. When released, the transparent plastic strip springs open to act as a support frame due to the material properties of the plastic. This method can achieve the purpose of opening and closing the support head 2 by pulling the opening and closing member from the outside. At the same time, the transparent material has less impact on the field of vision, reducing the obstruction of the field of vision of the colonoscope 1 and the sub-scope.

[0057] In some embodiments, reference Figure 3As shown, the support head 2 includes an elastic mesh cylinder 21 and a fixing member 22; the opening and closing member 7 has an internal thread on its surface, and the fixing member 22 has an external thread. The fixing member 22 is located inside the opening and closing member 7 and is screwed to the opening and closing member 7. The opening and closing member 7 can be an opening and closing tube with an internal thread inside. The fixing member 22 can be a fixing rod with an external thread on its outer surface. The opening and closing tube can rotate along the fixing member 22. When rotating, the opening and closing tube moves up and down along the fixing member 22. The fixing member 22 has a certain elasticity and toughness and can produce a certain amplitude of swing when the support head 2 is pulled by the first direction line 5 and the second direction line 6.

[0058] One end of the elastic mesh cylinder 21 is pivotally connected to the opening and closing member 7, and the other end is connected to the fixing member 22. When the opening and closing member 7 rotates and moves up and down along the fixing member 22, the elastic mesh cylinder 21 is pushed by the opening and closing member 7 towards the end of the fixing member 22 away from the clamping channel 11, thereby being squeezed and opened. When the opening and closing member 7 moves towards the clamping channel 11, the elastic mesh cylinder 21 is stretched and retracted.

[0059] Specifically, by connecting the opening and closing part 7 with the fixing part 22 by screwing, the expansion or retraction of the elastic mesh cylinder 21 can be easily controlled, thereby controlling the size of the elastic mesh cylinder 21 opening to adapt to different appendix orifices and appendix cavities. When necessary, it can also provide the effect of clamping fecal stones by opening and closing.

[0060] On the other hand, in addition to the rotation opening and closing structure, the stent head 2 can also adopt a pressing opening and closing structure such as tweezers, or an opening and closing structure in the style of a vascular stent. When the opening and closing structure of a vascular stent is adopted, the stent head 2 can include an elastic mesh cylinder 21 and an air balloon attached to the outer surface of the elastic mesh cylinder 21. The opening and closing component 7 adopts an opening and closing tube, which can deliver gas to the air balloon. When the air balloon is inflated, it expands the elastic mesh cylinder 21. When the air balloon deflates, the elastic mesh cylinder 21 is reset by its elastic force. This method can also realize the control of the elastic mesh cylinder 21.

[0061] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. An appendiceal orifice support device for endoscopic retrograde appendectomy, applied to a colonoscope (1), characterized in that, The colonoscope (1) includes a stent head (2), a stent base (3), an unfolding member (4), a first direction line (5), a second direction line (6), and an opening / closing member (7). The colonoscope (1) has a forceps channel (11). The stent base (3) is installed around the front end of the colonoscope (1). At least three sets of unfolding members (4) are provided and are installed sequentially along the stent base (3). The opening / closing member (7) is located inside the forceps channel (11) and is divided into a pushing end and a connecting end. The pushing end is located outside the colonoscope (1), and when pushed, the connecting end moves along the forceps channel (11) and extends out of the forceps channel (11). The stent head (2) is an elastic structure with expansion characteristics, and its bottom is connected to the connecting end and the unfolding member (4). The first direction line (5) and the second direction line (6) are respectively connected to the two sides of the stent head, and the connection heights of the first direction line (5) and the second direction line (6) are different.

2. The appendiceal orifice support device for endoscopic retrograde appendectomy according to claim 1, characterized in that, The first direction line (5) and the second direction line (6) are located in the clamp channel (11) and extend from the clamp channel (11) opening provided with the opening and closing member (7) push end.

3. The appendiceal orifice support device for endoscopic retrograde appendectomy according to claim 1, characterized in that, The unfolding component (4) includes a metal chain (41), and the metal chain (41) is connected to the support base (3) and the support head (2) in a movable manner.

4. The appendiceal orifice support device for endoscopic retrograde appendectomy according to claim 3, characterized in that, The surface of the metal chain (41) is provided with an adhesive layer.

5. An appendiceal orifice support device for endoscopic retrograde appendectomy according to claim 3 or 4, characterized in that, The metal chain (41) is formed by a number of metal rings (411) nested together, and a snap-fit ​​structure is provided between adjacent metal rings (411).

6. An appendiceal orifice support device for endoscopic retrograde appendectomy according to claim 5, characterized in that, The buckle structure includes a plastic buckle (412); one end of the metal ring (411) is provided with the plastic buckle (412), and the other end is provided with a buckle hole (413). The adjacent metal rings (411) are engaged with the buckle hole (413) through the plastic buckle (412).

7. The appendiceal orifice support device for endoscopic retrograde appendectomy according to claim 1, characterized in that, The unfolding component (4) includes a flexible transparent plastic strip with blunted edges.

8. The appendiceal orifice support device for endoscopic retrograde appendectomy according to claim 1, characterized in that, The support head (2) is a rotating opening and closing structure, including an elastic mesh cylinder (21) and a fixing member (22); the opening and closing member (7) has an internal thread on its surface, and the fixing member (22) has an external thread; the fixing member (22) is located inside the opening and closing member (7) and is screwed to the opening and closing member (7); the fixing member (22) has elasticity and toughness, and swings when the support head (2) is pulled by the first direction line (5) and the second direction line (6); one end of the elastic mesh cylinder (21) is pivotally connected to the opening and closing member (7), and the other end is connected to the fixing member (22).

Images