A thoracic surgery patient drainage care device

Abstract

The application discloses a thoracic surgery patient drainage nursing device and relates to the technical field of drainage nursing instruments, and has the technical features that the device comprises a drainage wound dressing assembly, and 8-10 groups of drainage tube petal-shaped binding members are arranged in an annular array on the top surface of the drainage wound dressing assembly. The drainage wound dressing and the drainage tube petal-shaped binding member are arranged around the drainage wound, the annular adsorbing cotton and the inner ring adsorbing cotton in the drainage wound dressing are connected through the flow guide cotton stick, the blood and the secretion around the wound can be adsorbed in time, the surrounding of the wound is kept dry, and the comfort of the patient is improved; the drainage tube petal-shaped binding member can bind and fix the drainage tube, the drainage tube keeps a stable posture, and the drainage tube is prevented from falling off; the drainage tube dredging assembly clamps the pipe body through the hoop member provided with the internal ball, the clogging in the pipe is squeezed in the process of moving along the pipe body, and unnecessary clogging in the drainage tube is avoided.

Description

Technical Field

[0001] This invention relates to the field of drainage and nursing devices, specifically to a drainage and nursing device for thoracic surgery patients. Background Technology

[0002] Closed drainage in thoracic surgery uses drainage bottles and tubes to remove potentially harmful fluids or gases from the patient's body. This ensures a balanced internal pressure, creating a favorable environment for normal organ function. During postoperative recovery, timely drainage of any exudate from the wound significantly reduces the risk of infection.

[0003] The inventors of this application have discovered that during the drainage phase in thoracic surgery patients, due to varying degrees of gaps between the drainage wound and the drainage tube, fluid from the pleural cavity can escape through these gaps, resulting in a significant amount of residual exudate around the wound. This not only causes wound infection but also causes discomfort for the patient during drainage. Furthermore, it has been found that the drainage solution often contains small amounts of nodules, which can easily become trapped inside the drainage tube, causing blockage and thus affecting the normal drainage process.

[0004] Therefore, this application aims to provide a drainage care device for thoracic surgery patients to solve the above-mentioned problems. Summary of the Invention

[0005] The purpose of this invention is to solve the technical problems mentioned in the background art, such as the inability to promptly treat minor bleeding from thoracic surgical drainage wounds, leading to itching at the wound site; and the possibility of blockage inside the drainage tube that cannot be effectively cleared, and to provide a drainage care device for thoracic surgical patients.

[0006] The above-mentioned objective of the present invention is achieved through the following technical solution:

[0007] A drainage care device for thoracic surgery patients includes a drainage wound dressing assembly. Eight to ten sets of drainage tube valve-shaped restraints are arranged in a circular array on the top surface of the drainage wound dressing assembly. A drainage tube is provided through the inner side of the drainage wound dressing assembly and the drainage tube valve-shaped restraints. A drainage tube unblocking assembly is clamped on the outer surface of the drainage tube. An arc-shaped handle is fixedly connected to the right side wall of the drainage tube unblocking assembly.

[0008] The drainage wound dressing assembly includes an annular shell, a cavity inside the annular shell, and 8-10 upright plates fixedly connected in a ring array to the inner sidewall of the annular shell. The cavity is filled with annular absorbent cotton. 6-8 drainage cotton rods are fixedly connected in a ring array to the inner side of the annular absorbent cotton. An inner ring of absorbent cotton located inside the annular shell is connected to the inner end of each drainage cotton rod. A layer of medical double-sided adhesive tape is adhered and fixedly connected to the bottom surface of the annular shell. Specifically: peel off the protective film at the bottom of the medical double-sided adhesive tape. Paper is adhered around the drainage wound, positioning the drainage wound in the middle of the annular shell. Using tweezers, the annular absorbent cotton is inserted into the cavity, bypassing the guide cotton rod and inserted into the inner cavity of the annular shell along the notch. The inner ring absorbent cotton is in contact with the area around the wound. At this point, the drainage tube passes through the annular shell and the inner ring absorbent cotton. After connecting the other end of the drainage tube to the drainage bottle, if there is bleeding or secretions around the wound, the inner ring absorbent cotton will absorb them. Once the inner ring absorbent cotton is saturated, it will be transferred to the inside of the annular absorbent cotton through the guide cotton rod.

[0009] Each of the drainage tube flap-shaped restraint components includes a flap, a connecting seat fixed to the inner side of the bottom surface of the flap, and a connecting block fixed to the inner surface of the upright plate. The outer end of the flap is hinged to the top of the upright plate, and a fan-shaped hollow silicone block is fixed to the inner end of the flap. Positioning posts are fixed on the outer sidewalls of the connecting seat and the connecting block, and tension springs are hooked between the positioning posts. Specifically, when the flap is flipped along the hinge point with the upright plate, the flaps will move closer together under the elastic tension of the tension springs, so that the inner surface of the fan-shaped hollow silicone block contacts the outer surface of the drainage tube. The drainage tube is fixed by the contraction of the fan-shaped hollow silicone block, thereby keeping the drainage tube in a relatively stable posture during the drainage process.

[0010] The drainage tube unblocking assembly includes a first arc-shaped ring and a second arc-shaped ring. 4-6 ball bearings are movably embedded on the inner surfaces of the first and second arc-shaped rings that are close to each other. The bottom ends of the first and second arc-shaped rings are hinged together. A protrusion and a support block are fixed to the top ends of the first and second arc-shaped rings, respectively. A lead screw that passes through the protrusion is movably disposed inside the support block, and an internally threaded knob is screwed onto the section of the lead screw that passes through the protrusion. Specific instructions: After drainage has been performed for a period of time or after drainage has stopped, in order to prevent blockages inside the drainage tube from affecting the next drainage, the drainage tube is clamped between the first and second arc-shaped rings. After the lead screw passes through the protrusion, the internal thread knob is turned so that the ball bearings between the first and second arc-shaped rings contact the tube body. By holding the arc-shaped handle, the first and second arc-shaped rings are moved along the drainage tube. At the same time, the first and second arc-shaped rings and the ball bearings deform the drainage tube inward, squeezing the drainage tube to expel the blockages inside into the drainage bottle, thus preventing blockages from forming inside the drainage tube.

[0011] Furthermore, the bottom surface of the annular shell is provided with an annular groove for embedding and adhering medical double-sided adhesive tape, and the bottom surface of the medical double-sided adhesive tape adheres and contacts the skin around the drainage wound.

[0012] Furthermore, each of the uprights has a notch between it for the guide cotton rod to pass through vertically, and each of the top ends of the uprights has a notch for the outer end of the flip plate to be inserted and rotated.

[0013] Furthermore, the bottom surface of the inner ring absorbent cotton is in contact with the tissue around the drainage wound, and the top end face of the annular shell is provided with an annular opening for inserting or removing the annular absorbent cotton for replacement.

[0014] Furthermore, both sides of the outer end of the flap are fixed with a rotating shaft, and the two ends of the rotating shaft are respectively inserted into the inner wall of the notch to rotate.

[0015] Furthermore, each of the fan-shaped hollow silicone blocks has a cavity inside for the fan-shaped hollow silicone block to contract or expand, and the bottom surface of the fan-shaped hollow silicone block is provided with a through hole for the air inside to be discharged or enter.

[0016] Furthermore, both the inner and outer ends of the tension spring are fixed with ring hooks, which are respectively hooked onto the positioning pins of the connecting seat and the connecting block, so as to allow the flip plate to return to a horizontal state after flipping.

[0017] Furthermore, each of the fan-shaped hollow silicone blocks has a concave arc surface on one side of its close proximity, and the inner arc surface of the fan-shaped hollow silicone block is in close contact with the outer ring surface of the drainage pipe.

[0018] Furthermore, two extension strips are fixed to the upper and lower sides of the side wall of the first arc-shaped ring away from the second arc-shaped ring, one end of the arc-shaped handle is inserted between the extension strips, and rivets penetrating the extension strips are fixed to the upper and lower end faces of the arc-shaped handle.

[0019] Furthermore, a pivot pin is provided at the overlapping position of the bottom ends of the first and second arc-shaped rings, penetrating both bottom ends. The support block has a through hole for the lead screw to pass through. The end of the lead screw away from the internal thread knob is fixed with a crossbeam that is locked inside the support block. The protrusion has an opening for the lead screw to pass through and for the internal thread knob to be engaged. Several grooves for ball bearings to be embedded and moved are provided on the side surfaces of the first and second arc-shaped rings that are close to each other.

[0020] As can be seen from the above technical solution, the drainage and nursing device for thoracic surgery patients provided by the present invention has the following beneficial effects compared with the prior art:

[0021] This invention utilizes a drainage wound dressing and a valve-shaped restraint for the drainage tube, placed around the drainage wound. The annular absorbent cotton in the drainage wound dressing is connected to the inner annular absorbent cotton via a guide cotton swab, allowing blood and secretions around the wound to be absorbed promptly, keeping the wound area dry and improving patient comfort. The valve-shaped restraint for the drainage tube secures and fixes the drainage tube, maintaining its stable position during drainage and preventing it from dislodging. Furthermore, a drainage tube unblocking component is installed on the tube body, using a clamp to hold the tube body. A ball bearing is installed inside the clamp, allowing the clamp to squeeze out blockages in the tube as it moves along the tube body, preventing unnecessary blockages inside the drainage tube. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments of the present invention or the prior art will be briefly introduced and explained below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the overall structure of thoracic surgery drainage and nursing equipment;

[0024] Figure 2 A schematic diagram of a drainage wound dressing assembly and a drainage tube flap restraint;

[0025] Figure 3 A schematic diagram showing the disassembled components of a drainage wound dressing;

[0026] Figure 4This is a schematic diagram showing the disassembled valve-shaped restraint component of the drainage tube.

[0027] Figure 5 A schematic diagram of the drainage tube unblocking assembly;

[0028] Figure 6 This is a schematic diagram showing the aftermath of the explosion and disassembly of the drainage tube unblocking component.

[0029] Appendix Figure 1 -Appendix Figure 6 The correspondence between the components is as follows:

[0030] 1. Drainage wound dressing assembly; 11. Ring-shaped shell; 12. Cavity; 13. Stand plate; 14. Ring-shaped absorbent cotton; 15. Inner ring absorbent cotton; 16. Drainage cotton swab; 17. Notch; 18. Opening; 19. Medical double-sided adhesive tape; 2. Drainage tube flap restraint; 21. Flip plate; 22. Connecting seat; 23. Fan-shaped hollow silicone block; 24. Tension spring; 25. Positioning post; 26. Connecting block; 3. Drainage tube unblocking assembly; 31. First arc-shaped ring; 32. Second arc-shaped ring; 33. Ball bearing; 34. Protrusion; 35. Internal threaded knob; 36. Lead screw; 37. Support block; 38. Extension strip; 39. Shaft pin; 4. Drainage tube; 5. Rivet; 6. Arc-shaped handle. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0032] To provide a clearer explanation and illustration of the technical solution and implementation of the present invention, the following describes preferred embodiments of the technical solution of the present invention.

[0033] Example: The present invention provides a preferred technical solution for a drainage and nursing device for thoracic surgery patients, as detailed in the appendix to the instruction manual. Figure 1 As shown, it includes a drainage wound dressing assembly 1. 8-10 sets of drainage tube flap-shaped restraints 2 are arranged in a ring array on the top surface of the drainage wound dressing assembly 1. A drainage tube 4 is provided through the inner side of the drainage wound dressing assembly 1 and the drainage tube flap-shaped restraints 2. A drainage tube unblocking assembly 3 is clamped on the outer surface of the drainage tube 4. An arc-shaped handle 6 is fixedly connected to the right side wall of the drainage tube unblocking assembly 3.

[0034] Refer to the instruction manual appendix Figure 3As shown, the drainage wound dressing assembly 1 includes an annular shell 11, a cavity 12 formed inside the annular shell 11, and 8-10 upright plates 13 fixedly connected in a ring array to the inner side wall of the annular shell 11. The cavity 12 is filled with annular absorbent cotton 14. 6-8 drainage cotton rods 16 are fixedly connected in a ring array to the inner side of the annular absorbent cotton 14. The inner end of the drainage cotton rods 16 is connected to an inner ring absorbent cotton 15 located inside the annular shell 11. A layer of medical double-sided adhesive tape 19 is adhered and fixedly connected to the bottom surface of the annular shell 11.

[0035] Refer to the instruction manual appendix Figure 4 As shown, each of the drainage tube flap-shaped restraint components 2 includes a flap 21, a connecting seat 22 fixed to the inner side of the bottom surface of the flap 21, and a connecting block 26 fixed to the inner surface of the upright plate 13. The outer end of the flap 21 is hinged to the top of the upright plate 13. A fan-shaped hollow silicone block 23 is fixed to the inner end of the flap 21. Positioning posts 25 are fixed on the outer sidewalls of the connecting seat 22 and the connecting block 26. Tension springs 24 are hooked between the positioning posts 25.

[0036] Refer to the instruction manual appendix Figure 6 As shown, the drainage tube unblocking component 3 includes a first arc-shaped ring 31 and a second arc-shaped ring 32. 4-6 balls 33 are movably embedded on the inner surfaces of the first arc-shaped ring 31 and the second arc-shaped ring 32 that are close to each other. The bottom ends of the first arc-shaped ring 31 and the second arc-shaped ring 32 are hinged to each other. A protrusion 34 and a support block 37 are respectively fixed to the top ends of the first arc-shaped ring 31 and the second arc-shaped ring 32. A lead screw 36 that passes through the protrusion 34 is movably arranged inside the support block 37, and an internally threaded knob 35 is screwed onto the section of the lead screw 36 that passes through the protrusion 34.

[0037] Refer to the instruction manual appendix Figure 3 As shown, the bottom surface of the annular shell 11 has an annular groove for embedding and adhering medical double-sided adhesive tape 19, and the bottom surface of the medical double-sided adhesive tape 19 adheres and contacts the skin around the drainage wound. The upright plates 13 are provided with notches 18 for the drainage cotton swabs 16 to pass through vertically between each other, and the top ends of the upright plates 13 are provided with notches 17 for the outer ends of the flip plate 21 to be inserted and rotated; the bottom surface of the inner ring absorbent cotton 15 contacts the tissue around the drainage wound, and the top end of the annular shell 11 is provided with an annular opening for the annular absorbent cotton 14 to be inserted, filled, or removed for replacement; the outer ends of the flip plate 21 are fixed with rotating shafts on both sides, and the two ends of the rotating shafts are respectively inserted into the inner wall of the notch 17 for rotation.

[0038] Refer to the instruction manual appendix Figure 4As shown, each of the fan-shaped hollow silicone blocks 23 has a cavity inside for the fan-shaped hollow silicone block 23 to contract or expand. The bottom surface of the fan-shaped hollow silicone block 23 is provided with a through hole for the air inside to be discharged or enter. The inner and outer ends of the tension spring 24 are fixed with ring hooks, and the ring hooks are respectively hooked on the positioning post 25 of the connecting seat 22 and the connecting block 26, so that the flip plate 21 can be reset to the horizontal state after flipping. The side end faces of the fan-shaped hollow silicone blocks 23 that are close to each other are provided with concave arc surfaces, and the inner arc surface of the fan-shaped hollow silicone block 23 is in close contact with the outer ring surface of the drainage pipe 4.

[0039] Refer to the instruction manual appendix Figure 6 As shown, two extension strips 38 are fixed to the upper and lower sides of the side wall of the first arc ring 31 away from the second arc ring 32. One end of the arc-shaped handle 6 is inserted between the extension strips 38, and rivets 5 that penetrate the extension strips 38 are fixed to the upper and lower end faces of the arc-shaped handle 6. A shaft pin 39 that penetrates the bottom ends of the first arc ring 31 and the second arc ring 32 is provided at the overlapping position of their bottom ends. A through hole for the lead screw 36 to pass through is opened inside the support block 37. A crossbeam that is stuck inside the support block 37 is fixed to the end of the lead screw 36 away from the internal thread knob 35. An opening for the lead screw 36 to pass through and for the internal thread knob 35 to be inserted is provided inside the protrusion 34. Several slots for the ball bearings 33 to be embedded and moved are opened on the side surfaces of the first arc ring 31 and the second arc ring 32 that are close to each other.

[0040] Based on the above-described preferred technical solution, the workflow of this technical solution is explained as follows:

[0041] Notably, the inner ring absorbent cotton 15 has a through hole for the drainage tube 4 to pass through, and the inner surface of the inner ring absorbent cotton 15 is in contact with the surface of the drainage tube 4. The bottom surface of the inner ring absorbent cotton 15 is in contact with the skin around the wound. The isolation paper at the bottom of the medical double-sided adhesive tape 19 is peeled off and adhered around the drainage wound, so that the drainage wound is located in the middle area of ​​the annular shell 11. The annular absorbent cotton 14 is inserted into the cavity 12 with tweezers, bypassing the guide cotton rod 16 and inserted into the inner cavity of the annular shell 11 along the notch 18. The inner ring absorbent cotton 15 is in contact with the wound. At this time, the drainage tube 4 passes through the annular shell 11 and the inner ring absorbent cotton 15. After the other end of the drainage tube 4 is connected to the drainage bottle, if there is bleeding or secretions around the wound, the inner ring absorbent cotton 15 will absorb them. After the inner ring absorbent cotton 15 is saturated, it will be transferred to the annular absorbent cotton 14 through the guide cotton rod 16.

[0042] Then, the flap 21 is flipped along the hinge point with the upright plate 13. Under the elastic tension of the tension spring 24, the flaps 21 will move closer together, and the inner surface of the fan-shaped hollow silicone block 23 will contact the outer surface of the drainage pipe 4. The drainage pipe 4 will be fixed by the contraction of the fan-shaped hollow silicone block 23, so that the drainage pipe 4 can maintain a relatively stable posture during the drainage process. To prevent blockages inside the drainage tube 4 from affecting the next drainage after a period of drainage or after drainage has stopped, the drainage tube 4 is clamped by the first arc-shaped ring 31 and the second arc-shaped ring 32. The screw 36 passes through the protrusion 34 and the internal thread knob 35 is turned so that the ball 33 between the first arc-shaped ring 31 and the second arc-shaped ring 32 contacts the tube body. By holding the arc-shaped handle 6, the first arc-shaped ring 31 and the second arc-shaped ring 32 are moved along the drainage tube 4. At the same time, the first arc-shaped ring 31, the second arc-shaped ring 32 and the ball 33 deform the drainage tube 4 inward. By squeezing the drainage tube 4, the blockages inside can be discharged into the drainage bottle, preventing blockages from occurring inside the drainage tube 4.

[0043] This invention is not limited to the preferred embodiments described above. Anyone should understand that structural changes made under the guidance of this invention, and any technical solutions that are the same as or similar to this invention, fall within the protection scope of this invention. Finally, it should be noted that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are only for illustrative purposes to aid those skilled in the art and are not intended to limit the implementation of this application. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effects and objectives of this application, should still fall within the scope of the technical content disclosed in this application.

Claims

1. A drainage care device for thoracic surgery patients, comprising a drainage wound dressing assembly (1), characterized in that: The top surface of the drainage wound dressing assembly (1) is provided with 8-10 sets of drainage tube flap-shaped restraints (2) arranged in a ring array. The drainage wound dressing assembly (1) and the drainage tube flap-shaped restraints (2) are provided with a drainage tube (4) through the inner side. The drainage tube unblocking assembly (3) is clamped on the outer ring surface of the drainage tube (4). An arc-shaped handle (6) is fixedly connected to the right side wall of the drainage tube unblocking assembly (3). The drainage wound dressing assembly (1) includes an annular shell (11), a cavity (12) opened inside the annular shell (11), and 8-10 upright plates (13) fixedly connected in a ring array to the inner side wall of the annular shell (11). The cavity (12) is filled with annular absorbent cotton (14). 6-8 drainage cotton rods (16) are fixedly connected in a ring array to the inner side of the annular absorbent cotton (14). The inner end of the drainage cotton rods (16) is connected to an inner ring absorbent cotton (15) located inside the annular shell (11). A layer of medical double-sided adhesive tape (19) is adhered and fixedly connected to the bottom surface of the annular shell (11). Each of the drainage tube flap-shaped restraint components (2) includes a flap (21), a connecting seat (22) fixed on the inner side of the bottom surface of the flap (21), and a connecting block (26) fixed on the inner surface of the upright plate (13). The outer end of the flap (21) is hinged to the top of the upright plate (13). A fan-shaped hollow silicone block (23) is fixed on the inner end of the flap (21). Positioning posts (25) are fixed on the outer sidewalls of the connecting seat (22) and the connecting block (26). Tension springs (24) are hooked between the positioning posts (25). The drainage tube unblocking component (3) includes a first arc-shaped ring (31) and a second arc-shaped ring (32). 4-6 balls (33) are movably embedded on the inner surfaces of the first arc-shaped ring (31) and the second arc-shaped ring (32) that are close to each other. The bottom ends of the first arc-shaped ring (31) and the second arc-shaped ring (32) are hinged to each other. The top ends of the first arc-shaped ring (31) and the second arc-shaped ring (32) are respectively fixed with a protrusion (34) and a support block (37). A screw rod (36) that passes through the protrusion (34) is movably arranged inside the support block (37), and an internally threaded knob (35) is screwed onto the section of the screw rod (36) that passes through the protrusion (34).

2. The drainage and nursing device for thoracic surgery patients according to claim 1, characterized in that: The bottom surface of the annular shell (11) is provided with an annular groove for embedding and adhering a medical double-sided adhesive tape (19), and the bottom surface of the medical double-sided adhesive tape (19) is in contact with the skin around the drainage wound.

3. The drainage and nursing device for thoracic surgery patients according to claim 1, characterized in that: Each of the upright plates (13) has a notch (18) between them for the guide cotton rod (16) to pass through vertically. Each of the upright plates (13) has a notch (17) at the top end for the outer end of the flip plate (21) to be inserted and rotated.

4. The drainage and nursing device for thoracic surgery patients according to claim 1, characterized in that: The bottom surface of the inner ring absorbent cotton (15) is in contact with the tissue around the drainage wound, and the top end face of the ring-shaped shell (11) is provided with a ring-shaped opening for inserting or removing the ring-shaped absorbent cotton (14) for replacement.

5. A drainage and nursing device for thoracic surgery patients according to claim 1, characterized in that: The outer ends of the flap (21) are fixed with rotating shafts, and the two ends of the rotating shafts are respectively inserted into the inner wall of the notch (17) to rotate.

6. The drainage and nursing device for thoracic surgery patients according to claim 1, characterized in that: The interior of each of the fan-shaped hollow silicone blocks (23) is provided with a cavity for the fan-shaped hollow silicone block (23) to contract or expand on its own, and the bottom surface of the fan-shaped hollow silicone block (23) is provided with a through hole for the air inside to be discharged or enter.

7. A drainage and nursing device for thoracic surgery patients according to claim 1, characterized in that: The inner and outer ends of the tension spring (24) are fixed with ring hooks, which are hooked onto the positioning pins (25) of the connecting seat (22) and the connecting block (26) respectively, so that the flip plate (21) can be reset to the horizontal state after flipping.

8. A drainage and nursing device for thoracic surgery patients according to claim 1, characterized in that: The fan-shaped hollow silicone blocks (23) have concave arc surfaces on their adjacent side ends, and the inner arc surfaces of the fan-shaped hollow silicone blocks (23) are in close contact with the outer ring surface of the drainage pipe (4).

9. A drainage and nursing device for thoracic surgery patients according to claim 1, characterized in that: Two extension strips (38) are fixed on the side wall of the first arc ring (31) away from the second arc ring (32). One end of the arc handle (6) is inserted between the extension strips (38), and rivets (5) that penetrate the extension strips (38) are fixed on the upper and lower end faces of the arc handle (6).

10. A drainage and nursing device for thoracic surgery patients according to claim 1, characterized in that: A shaft pin (39) is provided at the overlapping position of the bottom ends of the first arc ring (31) and the second arc ring (32), penetrating the bottom ends of both. The support block (37) has a through hole for the lead screw (36) to pass through. The end of the lead screw (36) away from the internal thread knob (35) is fixed with a crossbeam that is locked inside the support block (37). The protrusion (34) has an opening for the lead screw (36) to pass through and for the internal thread knob (35) to be locked in. Several grooves for the ball bearings (33) to be embedded and moved are provided on the side surfaces of the first arc ring (31) and the second arc ring (32) that are close to each other.

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