Retractor used in thyroid surgery
By designing a thyroid retractor for supporting rings, support components and adjustment components, the problems of insufficient and high cost of surgical field are solved, and the full exposure of surgical field and surgical stability are achieved, which facilitates the progress of thyroid surgery.
Patent Information
- Application Number
- CN202411344240.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-25
- Publication Date
- 2024-12-17
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
In thyroid surgery, in the absence of a second assistant, the surgical field of view is insufficient, which affects the progress of the surgery and increases the operation time. The existing incision protector cannot effectively pull deep tissue, increasing the financial burden on the patients.
A thyroid retractor including a support ring, a support assembly, an adjustment assembly and a propagation assembly is designed. The operation mouth is stabilized through supporting feet, rings, U-shaped rods, bidirectional threaded rods and rubber sleeves. Stand and position adjustment to ensure that the surgical field of view is fully exposed.
The device improves surgical stability through one-way limiting and elastic structure, facilitates doctors to adjust the size of the surgical mouth, reduces the operation time and cost, and expands the scope of application.
Smart Images

Figure CN119138942A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of medical instruments, and in particular to a retractor used in thyroid surgery. Background Art
[0002] Currently, the number of thyroid surgical operations is large, and each operation generally requires three people. The chief surgeon and the first assistant are mainly responsible for the surgical separation and cutting process, and the second assistant is responsible for the retraction of the skin and internal tissues to fully expose the surgical field of view and facilitate the smooth progress of the operation.
[0003] After a lot of searching, it was found that with the increase in the number of surgeries, the surgical staff were stretched to their limits. For some thyroid surgeries, there was only the main surgeon and the first assistant, but no second assistant. At this time, the surgical exposure was insufficient, which affected the progress of the operation, increased the operation time, and caused harm to the patient. Now there is a disposable incision protector that has the function of pulling the skin, but not the function of pulling deep tissues, and a protector costs several hundred yuan, which brings a financial burden to the patient. Summary of the invention
[0004] In order to remedy the above deficiencies, the present invention provides a retractor for use in thyroid surgery, aiming to improve the problem of "relatively limited scope of use" mentioned in the prior art.
[0005] In order to achieve the above object, the present invention adopts the following technical solution: a retractor used in thyroid surgery, comprising:
[0006] A support ring, used to be placed on the patient's neck for basic support;
[0007] A support component, used to enhance the support force of the support ring on the patient's neck;
[0008] An adjustment assembly, used for adjusting the height and width of the L-shaped rods;
[0009] The expansion assembly can be used to adjust the position of the L-shaped rod in a single position;
[0010] The support assembly is arranged on the outside of the support ring, the adjustment assembly is arranged on the left side of the support ring, and the adjustment assembly includes:
[0011] A U-shaped rod arranged in a U-shape;
[0012] An adjusting block is fixedly connected to the outer wall of the supporting ring, and the outer wall and the U-shaped rod are fastened and connected by screws;
[0013] A bidirectional threaded rod is fixedly connected to the outer wall of the U-shaped rod, the outer wall of the bidirectional threaded rod is threadedly connected with a nut, the support assembly is arranged at the bottom of the nut, and the bottom end of the support ring is fixedly connected with a support foot.
[0014] As a further description of the above technical solution:
[0015] The support assembly includes a circular ring, wherein the circular ring is fixedly connected to the outer wall of the support ring, the outer wall of the circular ring is rotatably connected to a circular block, the bottom end of the circular block is fixedly connected to a support block, the upper part of the circular block is penetrated and slidably connected to a T block, and the lower surface of the T block is fixedly connected to an extrusion block.
[0016] As a further description of the above technical solution:
[0017] The round block and the extrusion block are elastically connected via a spring, wherein one end of the spring is fixedly connected to the upper surface of the extrusion block, and the other end of the spring is fixedly connected to the inner wall of the round block.
[0018] As a further description of the above technical solution:
[0019] The extrusion block is arranged in a triangle shape, and a limiting groove is provided on the outer wall of the circular ring. The limiting groove is arranged in a triangle shape and is adapted to the extrusion block. The number of the limiting groove and the extrusion block is arranged in a plurality and the number is the same.
[0020] As a further description of the above technical solution:
[0021] The adjustment assembly also includes a telescopic rod, which is hinged on the right side of the nut. The end of the telescopic rod away from the nut is hinged on the upper surface of the support ring. The outer wall of the U-shaped rod is fixedly connected with blocks at both ends near the front and rear ends of the bidirectional threaded rod, and a support assembly is provided at the bottom of the nut.
[0022] As a further description of the above technical solution:
[0023] The expansion assembly includes a rectangular shell, which is fixedly connected to the bottom end of the nut. The inner wall of the bottom of the rectangular shell is slidably connected to a moving rod, and the bottom end of the moving rod is rotatably connected to an L-shaped rod. The outer wall of the connection between the moving rod and the L-shaped rod is provided with a rubber sleeve.
[0024] As a further description of the above technical solution:
[0025] A through slot is provided on the left surface of the rectangular shell, a bolt is threadedly connected to the left outer wall of the moving rod, a rubber pad is fixedly connected to the outer wall of the bolt, and the bolt passes through the through slot.
[0026] As a further description of the above technical solution:
[0027] The rubber pad is made of rubber material.
[0028] A method for using a retractor used in thyroid surgery, characterized in that it comprises the following steps:
[0029] S1: Check the equipment
[0030] Check whether all parts in the device can operate normally to avoid jamming;
[0031] S2: Preoperative preparation
[0032] S201: Equipment disinfection
[0033] Carry out comprehensive disinfection of equipment;
[0034] S202: Patient Preparation
[0035] Let the patient lie flat on the operating table, and give him an injection of anesthetic and disinfect the surgical site;
[0036] S3: Place the device
[0037] First, the area where the patient needs surgery is cut open, and then the support foot is placed at the surgical incision on the neck, and the support foot is used as a support. Since the support foot is set to a plastic material, it will be deformed by pressure when pressed down;
[0038] S4: Stable device
[0039] The expansion block is inserted into the surgical opening and pulled outward. When the expansion block is pulled outward, the round block is driven to rotate on the outer wall of the circular ring. When the round block rotates, the inclined surface of the extrusion block is moved upward by pressure due to its triangular configuration, driving the T block to move upward and compressing the spring, so that the extrusion block slides out of the limiting groove. When the extrusion block contacts another limiting groove, the reverse force of the spring resets the extrusion block, so that the extrusion block is again stuck in the limiting groove, thereby achieving the purpose of one-way limiting and increasing stability during later surgery.
[0040] S5: Open the surgical incision
[0041] The L-shaped rod is rotated to extend into the surgical incision, thereby achieving the purpose of opening the surgical incision, facilitating the subsequent surgical work of the doctor, and the rubber sleeve increases the stability of the L-shaped rod when rotating;
[0042] S6: Position adjustment
[0043] When the position of the L-shaped rod needs to be adjusted, the two-way threaded rod is rotated. When the two-way threaded rod is rotated, the telescopic rod is respectively hinged with the nut and the support ring. When the two-way threaded rod is rotated, the nut will only perform lateral relative movement. The nut is moved by rotating the two-way threaded rod to synchronously adjust the position of the L-shaped rod. When unidirectional adjustment is required, the bolt is rotated to rotate it outward and release the rubber pad from being squeezed against the outer wall of the rectangular shell. At this time, the moving rod can be slid to adjust the position of the L-shaped rod. When the position adjustment is completed, the bolt is rotated in the opposite direction to make the rubber pad squeeze the outer wall of the rectangular shell, thereby increasing friction and achieving simple fixation, and then the operation can be continued.
[0044] The present invention has the following beneficial effects:
[0045] 1. In the present invention, the support assembly is set so that the expansion block can achieve one-way limiting, which makes it more convenient for doctors to work. The size of the surgical incision can be adjusted according to actual conditions without manual fixation. In addition, the stability of the device during operation is further increased by fixing the support feet.
[0046] 2. In the present invention, the surgical incision can be stretched open by the provided L-shaped rod to achieve full exposure, and the position of the L-shaped rod can be adjusted by rotating the bidirectional threaded rod to achieve timely adjustment of the size of the surgical incision. In addition, the position of the L-rod can be adjusted individually by rotating the bolt to release the squeezing of the rubber pad on the rectangular shell, thereby expanding the application scope of the device and further improving the convenience of the doctor during the operation.
[0047] 3. In the present invention, the structure is simple and practical, and the cost is low. It can be used in large-scale production and has a large market prospect. BRIEF DESCRIPTION OF THE DRAWINGS
[0048] Figure 1 It is a schematic diagram of the three-dimensional structure of the overall device in the present invention;
[0049] Figure 2 It is a schematic side view of the three-dimensional structure of the overall device in the present invention;
[0050] Figure 3 It is a schematic diagram of the three-dimensional structure of the ring and the limiting groove in the present invention;
[0051] Figure 4 It is a bottom view schematic diagram of the round block three-dimensional structure in the present invention;
[0052] Figure 5 It is a schematic diagram of the three-dimensional structure of the propping assembly in the present invention;
[0053] Figure 6 It is a schematic diagram of the three-dimensional structure of the T block in the present invention.
[0054] Legend:
[0055] 1. Support ring; 2. Support assembly; 21. Limiting groove; 22. Circular ring; 23. Spreading block; 24. Extrusion block; 25. Circular block; 26. Spring; 27. T-block; 3. Support foot; 4. Adjustment assembly; 41. U-shaped rod; 42. Stopper; 43. Bidirectional threaded rod; 44. Telescopic rod; 45. Nut; 5. Spreading assembly; 51. L-shaped rod; 52. Rubber sleeve; 53. Bolt; 54. Rubber pad; 55. Rectangular shell; 56. Moving rod; 57. Through groove. DETAILED DESCRIPTION
[0056] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0057] Example:
[0058] Reference Figure 1 - Figure 2 The present invention provides a retractor used in thyroid surgery, including a support ring 1, the support ring 1 serves as a device body and is used to connect multiple structures. The outer wall of the support ring 1 is provided with a support component 2 for supporting the support ring 1, and the left side of the support ring 1 is provided with an adjustment component 4 for adjusting the position of the spreading component 5. The adjustment component 4 includes a U-shaped rod 41, and the outer wall of the support ring 1 is fixedly connected with an adjustment block 6. The U-shaped rod 41 is set in a U-shape, and the U-shaped rod 41 is fixedly installed on the outer wall of the adjustment block 6 by screws. The screw fixation is a relatively conventional fixing method. The outer wall of the U-shaped rod 41 is fixedly connected with a bidirectional threaded rod 43, and the bidirectional threaded rod 43 belongs to the prior art and can generate thread force in two opposite directions at the same time, so that the components connected thereto can move relatively, and cooperate with the telescopic rod 44 to enable the nut 45 to move relatively. Since this technology is the prior art, it will not be described in detail in this case.
[0059] The outer wall of the bidirectional threaded rod 43 is threadedly connected with a nut 45 , the bottom end of the nut 45 is provided with a spreading assembly 5 , and the bottom end of the support ring 1 is fixedly connected with a support foot 3 .
[0060] Reference Figure 2 - Figure 4 , Figure 6The support assembly 2 includes a circular ring 22, which is fixedly connected to the outer wall of the support ring 1. The outer wall of the circular ring 22 is rotatably connected with a circular block 25, and the bottom end of the circular block 25 is fixedly connected with a support block 23. The upper part of the circular block 25 passes through and is slidably connected with a T block 27. The lower surface of the T block 27 is fixedly connected with an extrusion block 24. The extrusion block 24 is arranged in a triangle, and the triangle is provided with an inclined surface, so that the extrusion block 24 can move upward under the pressure of the inclined surface after contacting the limiting groove 21 during movement and compressing the spring 26, thereby achieving the purpose of one-way limit. The circular block 25 and the extrusion block 24 are elastically connected by a spring 26, and the spring 26 plays a connecting role between the T block 27 and the extrusion block 24, and the T block 27 can be reset by the reverse force of the spring 26. One end of the spring 26 is fixedly connected to the upper surface of the extrusion block 24, and the other end of the spring 26 is fixedly connected to the inner wall of the circular block 25.
[0061] Reference Figure 3 , Figure 4 , Figure 6 The outer wall of the ring 22 is provided with a limiting groove 21, which is set to be triangular and matched with the extrusion block 24. The number of the limiting grooves 21 and the extrusion block 24 is set to be multiple and the number is the same, so as to achieve the purpose of one-way limiting, thereby increasing the convenience of the doctor's work.
[0062] Reference Figure 1 The adjustment component 4 also includes a telescopic rod 44. The telescopic rod 44 is a prior art and has a telescopic function. It is also to ensure that the nut 45 can move laterally. The telescopic rod 44 is hinged on the right side of the nut 45. The end of the telescopic rod 44 away from the nut 45 is hinged on the upper surface of the support ring 1. The outer wall of the U-shaped rod 41 is close to the front and rear ends of the bidirectional threaded rod 43 and is fixedly connected with a stopper 42. The stopper 42 prevents the nut 45 from sliding out of the bidirectional threaded rod 43. A support component 5 is provided at the bottom of the nut 45.
[0063] Reference Figure 1 , Figure 2 , Figure 5 The expansion assembly 5 includes a rectangular shell 55, which is fixedly connected to the bottom end of the nut 45. The inner wall of the bottom of the rectangular shell 55 is slidably connected to a moving rod 56. The bottom end of the moving rod 56 is rotatably connected to an L-shaped rod 51. The outer wall of the connection between the moving rod 56 and the L-shaped rod 51 is provided with a rubber sleeve 52. The rubber sleeve 52 is set to a rubber material. A through groove 57 is opened on the left surface of the rectangular shell 55, so that the bolt 53 can move in this area. The left outer wall of the moving rod 56 is threadedly connected to the bolt 53. The outer wall of the bolt 53 is fixedly connected to a rubber pad 54. The bolt 53 passes through the through groove 57, and the rubber pad 54 is set to a rubber material.
[0064] The present invention provides a method for using a retractor used in thyroid surgery, comprising the following steps:
[0065] S1: Check the equipment
[0066] Check whether all parts in the device can operate normally to avoid jamming;
[0067] S2: Preoperative preparation
[0068] S201: Equipment disinfection
[0069] Carry out comprehensive disinfection of equipment;
[0070] S202: Patient Preparation
[0071] Let the patient lie flat on the operating table, and give him an injection of anesthetic and disinfect the surgical site;
[0072] S3: Place the device
[0073] First, the position where the patient needs surgery is cut open, and then the support foot 3 is placed at the surgical incision on the neck, and the support foot 3 is used as a support. Since the support foot 3 is set to be a plastic material, it will be deformed by pressure when pressed downward;
[0074] S4: Stable device
[0075] Insert the expansion block 23 into the surgical incision and pull it outward. When the expansion block 23 is pulled outward, the round block 25 will be driven to rotate on the outer wall of the ring 22. When the round block 25 rotates, the extrusion block 24 is set in a triangular shape, and its inclined surface will be pressed upward to drive the T block 27 to move upward and compress the spring 26, so that the extrusion block 24 slides out of the limiting groove 21. When the extrusion block 24 contacts another limiting groove 21, it will be reset by the reverse force of the spring 26, so that the extrusion block 24 is again stuck in the limiting groove 21, thereby achieving the purpose of one-way limiting and increasing the stability during the later surgery.
[0076] S5: Open the surgical incision
[0077] The L-shaped rod 51 is rotated to extend into the surgical incision, thereby achieving the purpose of opening the surgical incision, facilitating the subsequent surgical work of the doctor, and the rubber sleeve 52 increases the stability of the L-shaped rod 51 during rotation;
[0078] S6: Position adjustment
[0079] When the height of the L-shaped rod 51 needs to be adjusted, the position of the adjusting bolt on the adjusting block 6 can be used. When the position of the L-shaped rod 51 needs to be adjusted, the bidirectional threaded rod 43 is rotated. When the bidirectional threaded rod 43 is rotated, the telescopic rod 44 is respectively hinged with the nut 45 and the support ring 1. When the bidirectional threaded rod 43 is rotated, the nut 45 will only perform a lateral relative movement. The nut 45 is moved by rotating the bidirectional threaded rod 43 to synchronously adjust the position of the L-shaped rod 51. When unidirectional adjustment is required, the bolt 53 is rotated to rotate it outward and the rubber pad 54 is released from the extrusion with the outer wall of the rectangular shell 55. At this time, the sliding moving rod 56 can be used to adjust the position of the L-shaped rod 51. When the position adjustment is completed, the bolt 53 is rotated in the opposite direction to make the rubber pad 54 squeeze the outer wall of the rectangular shell 55, thereby increasing the friction force and achieving simple fixation, and then the operation can be continued.
[0080] S7: Postoperative cleaning and maintenance
[0081] S701: Postoperative disassembly
[0082] After the operation is completed, first release the fixing of the bolt 53 to ensure that the expansion assembly 5 can move freely, then gently withdraw the L-shaped rod 51 from the surgical incision, and then pull the T block 27 upward to make the squeezing block 24 slide out of the limiting groove 21 to release the limit. At this time, the round block 25 can be rotated in the opposite direction to reset the expansion block 23, and the expansion block 23 can be gently moved away from the edge of the surgical incision, allowing the support ring 1 and all its attached components to be removed from the patient as a whole;
[0083] S702: Cleaning and disinfection
[0084] Place all disassembled parts in a dedicated cleaning tank and clean them thoroughly with a mild detergent to remove blood, tissue fragments and other dirt. After cleaning, rinse them with clean water and soak them in disinfectant for a certain period of time to ensure thorough disinfection. After that, rinse them again with clean water to remove the residual disinfectant and wipe them dry with a clean gauze or cloth towel;
[0085] S703: Inspection and maintenance
[0086] After cleaning and disinfection, carefully check each component for signs of damage or wear. If necessary, replace these components in time to ensure the integrity and functionality of the equipment. At the same time, check whether all threaded connections are tight and reinforce them if necessary;
[0087] S704: Storage and backup
[0088] Store properly inspected and well-maintained equipment in a dry, ventilated, dust-free environment, away from direct sunlight and moisture. At the same time, ensure that the equipment is easily accessible so that it can be quickly put into use during the next operation.
[0089] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A retractor used in thyroid surgery, comprising: A support ring (1) is used to be placed on the patient's neck for basic support; A support component (2) for enhancing the supporting force of the support ring (1) on the patient's neck; An adjustment component (4) for adjusting the height of the L-shaped rods (51) and the width therebetween; The expansion assembly (5) can adjust the position of the L-shaped rod (51) in a single position; The support assembly (2) is arranged on the outside of the support ring (1), and the adjustment assembly (4) is arranged on the left side of the support ring (1), characterized in that: the adjustment assembly (4) comprises: A U-shaped rod (41) is arranged in a U shape; An adjusting block (6) is fixedly connected to the outer wall of the supporting ring (1), and its outer wall and the U-shaped rod (41) are fastened together by screws; A bidirectional threaded rod (43), the bidirectional threaded rod (43) is fixedly connected to the outer wall of the U-shaped rod (41), the outer wall of the bidirectional threaded rod (43) is threadedly connected to a nut (45), the expansion assembly (5) is arranged at the bottom of the nut (45), and the bottom end of the support ring (1) is fixedly connected to a support foot (3).
2. A retractor for use in thyroid surgery according to claim 1, characterized in that: The support assembly (2) comprises a circular ring (22), wherein the circular ring (22) is fixedly connected to the outer wall of the support ring (1), the outer wall of the circular ring (22) is rotatably connected to a circular block (25), the bottom end of the circular block (25) is fixedly connected to a support block (23), the upper part of the circular block (25) is penetrated and slidably connected to a T block (27), and the lower surface of the T block (27) is fixedly connected to an extrusion block (24).
3. A retractor for use in thyroid surgery according to claim 2, characterized in that: The round block (25) and the extrusion block (24) are elastically connected via a spring (26), wherein one end of the spring (26) is fixedly connected to the upper surface of the extrusion block (24), and the other end of the spring (26) is fixedly connected to the inner wall of the round block (25).
4. The retractor used in thyroid surgery according to claim 2, characterized in that: The extrusion block (24) is arranged in a triangular shape, and a limiting groove (21) is provided on the outer wall of the circular ring (22). The limiting groove (21) is arranged in a triangular shape and is adapted to the extrusion block (24). The number of the limiting groove (21) and the extrusion block (24) is arranged to be multiple and the number is the same.
5. The retractor used in thyroid surgery according to claim 1, characterized in that: The adjustment assembly (4) further comprises a telescopic rod (44), the telescopic rod (44) being hinged on the right side of the nut (45), one end of the telescopic rod (44) away from the nut (45) being hinged on the upper surface of the support ring (1), the outer wall of the U-shaped rod (41) being close to the front and rear ends of the bidirectional threaded rod (43) being fixedly connected with stoppers (42), and a spreading assembly (5) being arranged at the bottom of the nut (45).
6. The retractor used in thyroid surgery according to claim 1, characterized in that: The expansion assembly (5) comprises a rectangular shell (55), wherein the rectangular shell (55) is fixedly connected to the bottom end of the nut (45), a moving rod (56) is slidably connected to the inner wall of the bottom of the rectangular shell (55), the bottom end of the moving rod (56) is rotatably connected to an L-shaped rod (51), and a rubber sleeve (52) is provided on the outer wall of the connection between the moving rod (56) and the L-shaped rod (51).
7. A retractor for use in thyroid surgery according to claim 6, characterized in that: A through slot (57) is provided on the left surface of the rectangular shell (55); a bolt (53) is threadedly connected to the left outer wall of the moving rod (56); a rubber pad (54) is fixedly connected to the outer wall of the bolt (53); and the bolt (53) passes through the through slot (57).
8. The retractor used in thyroid surgery according to claim 7, characterized in that: The rubber pad (54) is made of rubber material.
9. The method for using a retractor used in thyroid surgery according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1: Check the equipment Check whether all parts in the device can operate normally to avoid jamming; S2: Preoperative preparation S201: Equipment disinfection Carry out comprehensive disinfection of equipment; S202: Patient Preparation Let the patient lie flat on the operating table, and give him an injection of anesthetic and disinfect the surgical site; S3: Place the device First, the position of the patient requiring surgery is incised, and then the support foot (3) is placed at the surgical incision on the neck, and the support foot (3) is used as a support. Since the support foot (3) is made of plastic material, it will be deformed by pressure when pressed downward; S4: Stable device The expansion block (23) is inserted into the surgical opening and pulled outward. When the expansion block (23) is pulled outward, the round block (25) is driven to rotate on the outer wall of the circular ring (22). When the round block (25) rotates, the inclined surface of the extrusion block (24) is moved upward due to the pressure of the triangular shape, driving the T block (27) to move upward and compressing the spring (26), so that the extrusion block (24) slides out of the limiting groove (21). When the extrusion block (24) contacts another limiting groove (21), the reverse force of the spring (26) resets the extrusion block (24) so that it is again inserted into the limiting groove (21), thereby achieving the purpose of one-way limiting and increasing the stability during the later operation. S5: Open the surgical incision The L-shaped rod (51) is rotated to extend into the surgical incision, thereby achieving the purpose of opening the surgical incision, facilitating the doctor's subsequent surgical work, and increasing the stability of the L-shaped rod (51) during rotation through the rubber sleeve (52); S6: Position adjustment When the position of the L-shaped rod (51) needs to be adjusted, the bidirectional threaded rod (43) is rotated. When the bidirectional threaded rod (43) is rotated, the telescopic rod (44) is respectively hinged with the nut (45) and the support ring (1). When the bidirectional threaded rod (43) is rotated, the nut (45) only performs a lateral relative movement. By rotating the bidirectional threaded rod (43), the nut (45) is moved, thereby synchronously adjusting the position of the L-shaped rod (51). When a single-direction adjustment is required, the bolt (53) is rotated to rotate it outward and release the rubber pad (54) from being pressed against the outer wall of the rectangular shell (55). At this time, the sliding moving rod (56) can be used to adjust the position of the L-shaped rod (51). When the position adjustment is completed, the bolt (53) is rotated in the opposite direction to cause the rubber pad (54) to press against the outer wall of the rectangular shell (55), thereby increasing the friction force and achieving simple fixation. Then, the operation can be continued.
