Double-anti-blocking drainage tube capable of adjusting negative pressure

Abstract

The utility model belongs to the field of medical instruments, and particularly relates to a double-anti-blocking drainage tube capable of adjusting negative pressure, which comprises an upper cover and a shell which are in threaded connection, a filter component is arranged in the shell, a negative pressure regulator is arranged on the upper cover, the negative pressure regulator is a hollow bulge outwards arranged from the upper cover, and the negative pressure regulator is arranged on the shell. A partition plate is arranged in the negative pressure regulator in a hollow mode, an open hole is formed in the partition plate, a switch knob is rotatably arranged in the partition plate, and the shifting piece and the cover plate are fixedly connected with the switch knob. When the phenomenon that the negative pressure attraction force is too large occurs in the drainage process, the size of the opening of the partition plate covered by the cover plate is adjusted, pressure reduction adjustment can be conveniently conducted on the negative pressure attraction force in the drainage process, and use of medical staff is facilitated.

Description

Technical Field

[0001] This utility model belongs to the field of medical devices, specifically relating to a double anti-blockage drainage tube with adjustable negative pressure. Background Technology

[0002] Negative pressure drainage devices are commonly used surgical instruments during surgery. The drainage tube is placed at the affected area and connected to the negative pressure device. Through negative pressure suction, the accumulated fluid and waste fluid at the affected area can be sucked out and collected, which helps to avoid harm to the patient from the accumulated fluid and waste fluid, prevent infection, and avoid the occurrence of inflammation.

[0003] Conventional negative pressure drainage devices generally include a liquid collection device, a suction line, and a negative pressure line. The suction line is connected to the target cavity for drainage, and the negative pressure line is connected to a negative pressure terminal. The negative pressure terminal generates a negative pressure suction effect to guide waste liquid, accumulated liquid, and debris into the collection device. However, when this negative pressure drainage device is working, it is difficult to easily adjust the negative pressure suction effect when it is too large.

[0004] During negative pressure aspiration, the aspirated waste fluid and accumulated fluid contain various residues such as fat clumps, tissue clumps, and blood clots, which can clog the drainage device. As the drainage time increases, the suction power of the negative pressure aspiration gradually weakens, requiring replacement of the drainage tube after complete blockage. This inconvenience and reduced surgical efficiency are problems. The inventor has already filed a patent application (application number 2024103328295) entitled "An Anti-clogging Filtering Suction Drainage Tube" to address these issues. However, further research revealed that improvements can be made to better control the negative pressure aspiration and achieve better drainage results. Based on this, the inventor provides the technical solution in this application. Summary of the Invention

[0005] To address the problems of inconvenience in adjusting negative pressure suction during drainage and significant interference with the drainage process when blockage occurs in existing technologies, this utility model provides a dual anti-blockage drainage tube with adjustable negative pressure. It features a negative pressure regulator with an opening in its partition. By rotating the switch knob and lever to adjust the size of the opening covered by the cover plate, the negative pressure suction can be easily adjusted during drainage. The inner and outer suction tubes are snap-fitted together. If a decrease in negative pressure suction or blockage occurs, the outer suction tube can be easily removed to continue the drainage operation, making it convenient for medical personnel.

[0006] This utility model provides a dual anti-clogging drainage tube with adjustable negative pressure, comprising a housing with an upper opening and a second interface at the bottom, and an upper cover disposed on the upper part of the housing and threadedly connected to the housing. A first interface at the top of the upper cover is connected to a suction tube. A filter assembly is disposed inside the housing, and its second interface at the bottom is connected to a negative pressure pipeline. A negative pressure regulator is disposed on the upper cover. The negative pressure regulator is a hollow protrusion extending outward from the upper cover. A partition is disposed inside the hollow negative pressure regulator. An opening is provided on the partition. A rotatable switch knob is disposed in the partition. A lever and a cover plate are fixedly connected to the switch knob. The suction tube includes an outer suction tube and an inner suction tube disposed inside the outer suction tube.

[0007] When in use, connect the negative pressure tubing to the negative pressure collection device, and then perform a drainage operation to draw the fluid from the surgical site to the suction tube. After passing through the top cover, the housing, and the internal filter components, the fluid is then drawn into the negative pressure collection device through the negative pressure tubing.

[0008] Rotating the switch knob or lever causes the cover plate to rotate, adjusting the size of the opening in the partition plate covered by the cover plate, which can regulate the negative pressure suction during the drainage process.

[0009] Preferably, multiple through holes are formed on the bottom and side walls of the end of the external suction tube opposite to the first interface, and the diameter of the opening of the internal suction tube opposite to the first interface is larger than the through hole at the end of the external suction tube.

[0010] More preferably, the opening at the other end of the inner suction tube relative to the first interface is a flat, round, variable-diameter head, the minor diameter of which is greater than the diameter of the through hole at the other end of the outer suction tube relative to the first interface.

[0011] Preferably, the first interface of the upper cover is fixedly connected to the base, and the other end of the base opposite to the first interface is snapped into the inner suction tube and the outer suction tube.

[0012] The diameter of the external suction tube's through hole is smaller than the small diameter of the reducing flat head, ensuring that all objects being suctioned can be attracted by the internal suction tube. If blockage occurs during suction, the external suction tube can be pulled directly from the base, and only the internal suction tube can be used for suction. This allows for convenient and quick operation, reducing the workload of medical staff.

[0013] Preferably, a through hole is provided in the center of the partition, and the switch knob is inserted into the through hole in the center of the partition. A mounting platform is provided at the bottom of the switch knob. After the switch knob is inserted into the through hole, the mounting platform can prevent the switch knob from coming out.

[0014] Preferably, a filter membrane is fixed inside the negative pressure regulator, below the partition, and the filter membrane completely covers the openings on the partition. The filter membrane allows external air to be filtered and sterilized before being drawn into the negative pressure source, without contaminating the internal gas and avoiding harm to the patient.

[0015] Preferably, a sealing ring is fixed at the through hole in the center of the partition. When the switch knob is inserted into the through hole, the switch knob and the sealing ring are tightly fitted together to achieve a sealing effect.

[0016] Preferably, the lever is provided with a scale pointer, and the opening on the top surface of the negative pressure regulator corresponding to the partition plate is provided with a scale. The scale pointer and the scale can be attached to the lever and the partition plate in various forms, preferably by printing.

[0017] Preferably, the filter assembly includes a first filter cartridge and a second filter cartridge. The first filter cartridge has multiple first side holes on its side wall and multiple first bottom holes on its bottom wall. An integral first filter platform is provided on its top. A slot is provided on the first filter platform, and multiple first platform holes are provided. The second filter cartridge has multiple second side holes on its side wall and multiple second bottom holes on its bottom wall. An integral second filter platform is provided on its top. A slot is provided on the top of the second filter cartridge corresponding to the slot, and multiple second platform holes are provided.

[0018] After the first and second filter cartridges are assembled by the cooperation of the slots and the mounting platform, the positions of the first side hole and the second side hole correspond, and the positions of the first bottom hole and the second bottom hole also correspond.

[0019] Preferably, the outer diameter of the second filter cartridge is larger than that of the first filter cartridge, the diameter of the second side hole is greater than or equal to the diameter of the first side hole, and the diameter of the second bottom hole is greater than or equal to the diameter of the first bottom hole.

[0020] Preferably, a limiter is provided on the top cover, and a limiting groove is provided on the base corresponding to the limiter. When the base is fixed to the top cover through the first interface, the limiter and the limiting groove cooperate with each other to better limit and fix the base.

[0021] Preferably, the side of the housing is provided with anti-slip grooves; and a Robert clamp is provided on the negative pressure pipeline.

[0022] The adjustable negative pressure double anti-clogging drainage tube provided by this utility model achieves the following technical effects:

[0023] 1) A negative pressure regulator is installed on the top cover. The negative pressure regulator is equipped with a partition with an opening. A switch knob, a lever, and a cover plate are rotatably installed in the center of the regulator. When the negative pressure attraction is too strong during the drainage process, the cover plate can be rotated by turning the switch knob or lever to adjust the size of the cover plate covering the opening of the partition. The negative pressure attraction can be easily reduced and adjusted during the drainage process.

[0024] 2) A scale pointer and scale are set on the top of the lever and the negative pressure regulator, so that the adjustment of the negative pressure attraction can be observed intuitively during the adjustment process;

[0025] 3) An external suction tube and an internal suction tube are installed at the first interface of the top cover by snap-fit, and a first filter cartridge and a second filter cartridge are installed as a filtration assembly. The first filter cartridge and the second filter cartridge are fixedly connected by a slot and a mounting plate. When the negative pressure suction gradually decreases or blockage occurs during the suction process, the Robert clamp or negative pressure collection device can be closed, the external suction tube can be pulled out directly, and the first filter cartridge can be unscrewed from the second filter cartridge or replaced to overcome the blockage problem in the negative pressure suction. This has less interference with the negative pressure suction process and ensures the continuity of the negative pressure suction. Attached Figure Description

[0026] Figure 1 A schematic diagram of the overall structure of the dual anti-clogging drainage tube with adjustable negative pressure.

[0027] Figure 2 for Figure 1 Enlarged view of section A in the middle;

[0028] Figure 3 A schematic diagram of a double anti-blockage drainage tube with adjustable negative pressure without an external suction tube;

[0029] Figure 4 for Figure 3 The enlarged view of section B, with its view orientation as follows: Figure 3 As shown in C;

[0030] Figure 5 This is a schematic diagram of the top cover;

[0031] Figure 6 This is a schematic diagram of the casing;

[0032] Figure 7 This is a schematic diagram of the first filter cartridge;

[0033] Figure 8 This is a schematic diagram of the second filter cartridge;

[0034] Figure 9 This is a schematic diagram of the filtering components;

[0035] Figure 10 This is a schematic diagram showing the negative pressure regulator in its fully open state.

[0036] Figure 11 This is a schematic diagram of the negative pressure regulator in a half-open state.

[0037] Figure 12 This is a schematic diagram showing the negative pressure regulator in the off state.

[0038] Figure 13 This is a cross-sectional view of the top cover and negative pressure regulator (sectioning direction as shown). Figure 5 (as shown)

[0039] Figure 14 This is a 3D view of the top cover;

[0040] Wherein: 1 is the top cover; 1-1 is the first interface; 2 is the shell; 2-1 is the anti-slip groove; 2-2 is the second interface; 3 is the negative pressure regulator; 3-1 is the switch knob; 3-2 is the lever; 3-3 is the cover plate; 3-4 is the partition; 3-5 is the filter membrane; 3-6 is the sealing ring; 4 is the filter assembly; 4-1 is the first filter cartridge; 4-11 is the slot; 4-12 is the first platform hole; 4-13 is the first side hole; 4-14 is the first bottom hole; 4-2 is the second filter cartridge; 4-21 is the platform; 4-22 is the second platform hole; 4-23 is the second side hole; 4-24 is the second bottom hole; 4-25 is the guide block; 5 is the limiter; 6 is the base; 7 is the clamp; 8 is the inner suction tube; 8-1 is the reducing flat head; 9 is the outer suction tube; 10 is the negative pressure pipeline; 11 is the Robert clamp. Detailed Implementation

[0041] The technical solution of this utility model will be further described below with reference to specific embodiments. These embodiments are only used to illustrate the technical solution of this utility model in more detail and should not be construed as limiting the scope of protection of this utility model. Except for the specific structures described in the embodiments below, other structures of the drainage tube can be directly referred to in the prior application, application number 2024103328295, entitled "An Anti-clogging Filter Suction Drainage Tube".

[0042] Example 1

[0043] This utility model provides a dual anti-clogging drainage tube with adjustable negative pressure, such as... Figure 1 , Figure 5 and Figure 6 As shown, the housing 2 includes an opening at the top and a second interface 2-2 at the bottom, and an upper cover 1 located on the upper part of the housing 2 and threadedly connected to the housing 2. The first interface 1-1 at the top of the upper cover 1 is connected to the suction tube. A filter assembly 4 is provided inside the housing 2, and its second interface 2-2 at the bottom is connected to the negative pressure pipeline 10. The suction tube includes an outer suction tube 9 and an inner suction tube 8 located inside the outer suction tube 9.

[0044] A negative pressure regulator 3 is installed on the upper cover 1, such as Figures 10 to 14 As shown, the negative pressure regulator 3 is a hollow protrusion extending outward from the top cover 1. Inside the negative pressure regulator 3, there is a partition 3-4 with an opening. A switch knob 3-1 is rotatably mounted in the partition 3-4. A lever 3-2 and a cover plate 3-3 are fixedly connected to the switch knob 3-1.

[0045] When in use, connect the negative pressure pipeline 10 to the negative pressure collection device, and then perform a drainage operation to draw the liquid from the surgical site to the suction tube. After passing through the top cover 1, the housing 2 and the internal filter assembly 4, the liquid is drawn into the negative pressure collection device through the negative pressure pipeline 10.

[0046] Multiple through holes are formed on the bottom and side walls of the end of the external suction tube 9 opposite to the first interface 1-1, and the diameter of the opening of the inner suction tube 8 opposite to the first interface 1-1 is larger than the through hole at the end of the external suction tube 9.

[0047] Preferably, the opening at the other end of the inner suction tube 8 relative to the first interface 1-1 is a flat, round, variable-diameter head 8-1. The minor diameter of the variable-diameter head 8-1 is larger than the diameter of the through hole at the other end of the outer suction tube 9 relative to the first interface 1-1. Figure 2 and Figure 4 As shown.

[0048] Preferably, the first interface 1-1 of the upper cover 1 is fixedly connected to the base 6, and the other end of the base 6 relative to the first interface 1-1 is engaged with the inner suction tube 8 and the outer suction tube 9.

[0049] The diameter of the through hole of the outer suction tube 9 is smaller than the small diameter of the reducing flat head 8-1, which ensures that all objects being attracted can be attracted by the inner suction tube 8. If a blockage occurs during the attraction process, the outer suction tube 9 can be pulled out from the base 6, and only the inner suction tube 8 can be used for attraction.

[0050] The base 6 can be fixedly connected to the first interface 1-1 in various ways, including but not limited to socketing and snap-fitting.

[0051] Preferably, a through hole is provided in the center of the partition 3-4, and the switch knob 3-1 is inserted into the through hole in the center of the partition 3-4. A mounting platform is provided at the bottom of the switch knob 3-1 to prevent the switch knob 3-1 from coming out after being inserted into the through hole.

[0052] During the negative pressure suction process, the pressure inside the upper cover 1 and the housing 2 can be adjusted by the negative pressure regulator 3. By rotating the lever 3-2 or the switch knob 3-1 on the negative pressure regulator 3, the cover plate 3-3 can be rotated, which can adjust the size of the opening on the partition 3-4 covered by the cover plate 3-3. When the negative pressure regulator 3 is turned on, the outside air enters the upper cover 1 through the opening on the partition 3-4 on the negative pressure regulator 3, which shares part of the negative pressure of the suction tube and plays the role of reducing negative pressure and adjusting suction pressure.

[0053] A filter membrane 3-5 is fixed inside the negative pressure regulator 3, below the partition 3-4, so that the outside air is filtered and bacteria are removed before being drawn to the negative pressure source, which will not pollute the internal gas and avoid harming the patient. The filter membrane 3-5 completely covers the opening on the partition 3-4.

[0054] Preferably, a sealing ring 3-6 is fixed at the through hole in the center of the partition 3-4. When the switch knob 3-1 is inserted into the through hole, the switch knob 3-1 and the sealing ring 3-6 are tightly fitted together to achieve a sealing effect.

[0055] Preferably, the lever 3-2 is provided with a scale pointer, and the top surface of the negative pressure regulator 3 is provided with a scale corresponding to the opening of the partition 3-4. The scale pointer and scale can be attached to the lever 3-2 and the partition 3-4 in various forms, preferably by printing.

[0056] like Figure 7 , Figure 8 and Figure 9 As shown, the filter assembly 4 includes a first filter cartridge 4-1 and a second filter cartridge 4-2. The first filter cartridge 4-1 has multiple first side holes 4-13 on its side wall and multiple first bottom holes 4-14 on its bottom wall. An integral filter platform is provided on its top, and a slot 4-11 is provided on the filter platform, along with multiple first platform holes 4-12. The second filter cartridge 4-2 has multiple second side holes 4-23 on its side wall and multiple second bottom holes 4-24 on its bottom wall. An integral filter platform is provided on its top, and a slot 4-21 is provided on the top of the second filter cartridge 4-2 corresponding to the slot 4-11, along with multiple second platform holes 4-22.

[0057] The outer diameter of the second filter cartridge 4-2 is larger than that of the first filter cartridge 4-1, the diameter of the second side hole 4-23 is greater than or equal to the diameter of the first side hole 4-13, and the diameter of the second bottom hole 4-24 is greater than or equal to the diameter of the first bottom hole 4-14.

[0058] A schematic diagram of the assembled first filter cartridge 4-1 and second filter cartridge 4-2 is shown below. Figure 9 As shown, the second filter cartridge 4-2 is fixedly assembled with the first filter cartridge 4-1 into a filter assembly 4 by the cooperation of its locking platform 4-21 with the locking groove 4-11 on the first filter cartridge 4-1. After assembly, the first side hole 4-13 and the second side hole 4-23 are in the same position, and the first bottom hole 4-14 and the second bottom hole 4-24 are in the same position.

[0059] Preferably, a limiter 5 is provided on the upper cover 1, and a limiting groove is provided on the base 6 corresponding to the limiter 5. When the base 6 is fixed to the upper cover 1 through the first interface 1-1, the limiter 5 and the limiting groove cooperate with each other to better limit and fix the base 6.

[0060] The side of the housing 2 is provided with anti-slip grooves 2-1; the negative pressure pipeline 10 is provided with Robert clamps 11.

[0061] In actual use, the first filter cartridge 4-1 and the second filter cartridge 4-2 are first assembled into a filter assembly 4 by the cooperation of the slot 4-11 and the mounting plate 4-21. The filter assembly 4 is then placed inside the housing 2. The upper cover 1 and the housing 2 are then fixedly connected by threads. The negative pressure pipeline 10 is connected to the second interface 2-2 at the bottom of the housing 2. The base 6 is fixedly connected to the first interface 1-1 of the upper cover 1. The inner suction pipe 8 and the outer suction pipe 9 are then sequentially snapped onto the base 6.

[0062] Then connect the negative pressure pipeline 10 to the negative pressure collection device. At this time, the Robert clamp 11 can be opened, and the external suction tube 9 and internal suction tube 8 can be used to drain the affected area. The drained liquid enters the filter assembly 4 through the suction tube, and after filtration, it enters the negative pressure pipeline 10 from the second interface 2-2 of the housing 2, and then enters the negative pressure collection device.

[0063] When the negative pressure suction is too strong, the negative pressure regulator 3 can be adjusted by rotating its switch knob 3-1 and lever 3-2 to change it from the closed state to the open state. Combined with the scale pointer on lever 3-2 and the scale on the top of the negative pressure regulator 3, the size of the opening of the cover plate 3-3 covering the partition plate 3-4 can be adjusted to achieve the purpose of adjusting the negative pressure in the device.

[0064] When the negative pressure suction gradually decreases and blockage occurs during the drainage process, the Robert clamp 11 or the negative pressure collection device can be turned off. The external suction tube 9 can be pulled out from the base 6, and only the internal suction tube 8 can be used. At the same time, the top cover 1 can be unscrewed from the housing 2, and the first filter cartridge 4-1 can be pulled out from the second filter cartridge 4-2. A new first filter cartridge 4-1 can be replaced. Alternatively, only the second filter cartridge 4-2 can be used to continue the drainage operation.

[0065] When autologous bone grafting is needed, the bone tissue in the first filter cartridge 4-1 can be removed and processed for use in autologous bone grafting. This operation is convenient and causes minimal interference with the drainage process.

[0066] Example 2

[0067] A dual anti-blockage drainage tube with adjustable negative pressure has a structure basically the same as that in Example 1, except that the base 6 does not have an external suction tube 9 for engaging with it, but only an internal suction tube 8. Figure 3 As shown.

[0068] In actual use, the method is basically the same as that described in Example 1. The only difference is that if the negative pressure suction gradually decreases and blockage occurs during the drainage process, since the device is not equipped with an external suction tube 9, there is no operation to pull out the external suction tube 9. Just unscrew the top cover 1, take out the first filter cartridge 4-1 and replace the first filter cartridge 4-1, or just use the second filter cartridge 4-2 to continue drainage.

[0069] The above description is only a preferred embodiment of the present utility model, but the protection scope of the utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed by the utility model, based on the technical solution and the inventive concept of the utility model, should be included within the protection scope of the utility model.

Claims

1. A double anti-blocking drainage tube with adjustable negative pressure size, comprising an upper opening, a shell (2) with a second interface arranged at the bottom, and an upper cover (1) arranged at the upper part of the shell (2) and threadedly connected with the shell (2), wherein a first interface (1-1) is arranged at the top of the upper cover (1) and connected with a suction tube, and a filter assembly (4) is arranged inside the shell (2), wherein a second interface (2-2) is arranged at the bottom of the filter assembly (4) and connected with a negative pressure pipeline (10), characterized in that: The negative pressure regulator (3) is internally hollow and protrudes outward from the upper cover (1), a partition plate (3-4) is arranged in the internal hollow of the negative pressure regulator (3), an opening is arranged on the partition plate (3-4), and a switch knob (3-1) is rotatably arranged in the partition plate (3-4); the suction pipe comprises an outer suction pipe (9) and an inner suction pipe (8) arranged in the inner suction pipe (9). ​ 2. The dual anti-clogging drainage tube with adjustable negative pressure according to claim 1, wherein, A through hole is arranged at the center of the partition plate (3-4), the switch knob (3-1) is inserted into the through hole at the center of the partition plate (3-4), and a hanging table is arranged at the bottom of the switch knob (3-1).

3. The dual anti-clogging drainage tube with adjustable negative pressure according to claim 2, wherein, A sealing ring (3-6) is fixedly arranged at the through hole at the center of the partition plate (3-4), and the switch knob (3-1) is tightly matched with the sealing ring (3-6) when the switch knob (3-1) is inserted into the through hole.

4. The dual anti-clogging drainage tube with adjustable negative pressure according to any one of claims 1-3, characterized in that, A filter membrane (3-5) is fixedly arranged in the internal hollow of the negative pressure regulator (3) and below the partition plate (3-4).

5. The dual anti-clogging drainage tube with adjustable negative pressure according to claim 4, wherein, A scale pointer is arranged on the switch knob (3-1), and a scale is arranged on the top surface of the negative pressure regulator (3) corresponding to the opening of the partition plate (3-4).

6. The dual anti-clogging drainage tube with adjustable negative pressure size according to claim 1, wherein, The outer suction pipe (9) is provided with a through hole on the end wall and the side wall of the other end of the first interface (1-1), and the opening of the other end of the inner suction pipe (8) relative to the first interface (1-1) is a variable-diameter flat head (8-1) in a flat circular shape, and the small diameter of the variable-diameter flat head (8-1) is greater than the diameter of the through hole on the end of the other end of the outer suction pipe (9) relative to the first interface (1-1).

7. The dual anti-clogging drainage tube with adjustable negative pressure according to claim 6, wherein, The first interface (1-1) of the upper cover (1) is fixedly connected with the base (6), and the other end of the base (6) relative to the first interface (1-1) is clamped with the inner suction pipe (8) and the outer suction pipe (9).

8. The dual anti-clogging drainage tube with adjustable negative pressure according to any one of claims 1-3, characterized in that, The filter assembly (4) comprises a first filter cylinder (4-1) and a second filter cylinder (4-2), a plurality of first side holes (4-13) are arranged on the side wall of the first filter cylinder (4-1), a plurality of first bottom holes (4-14) are arranged on the bottom wall, an integral first filter table is arranged on the top of the first filter cylinder, a clamping groove (4-11) is arranged on the first filter table, and a plurality of first table holes (4-12) are arranged; a plurality of second side holes (4-23) are arranged on the side wall of the second filter cylinder (4-2), a plurality of second bottom holes (4-24) are arranged on the bottom wall, an integral second filter table is arranged on the top of the second filter cylinder (4-2), a clamping table (4-21) is arranged on the top of the second filter cylinder (4-2) corresponding to the clamping groove (4-11), and a plurality of second table holes (4-22) are arranged.

9. The dual anti-clogging drainage tube with adjustable negative pressure size according to claim 8, wherein, The outer diameter of the second filter cylinder (4-2) is greater than that of the first filter cylinder, the diameter of the second side hole (4-23) is greater than or equal to that of the first side hole (4-13), and the diameter of the second bottom hole (4-24) is greater than or equal to that of the first bottom hole (4-14).

10. The dual anti-clogging drainage tube with adjustable negative pressure according to any one of claims 1-3, characterized in that, A limiter (5) is arranged on the upper cover (1), and a limiting groove is arranged on the base (6) corresponding to the limiter.

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