A treatment head for a light energy therapy device with reduced light energy consumption

Abstract

The application discloses a treatment head for a light energy therapeutic instrument with reduced light energy consumption, and belongs to the field of light energy therapeutic instruments. The treatment head for the light energy therapeutic instrument with reduced light energy consumption comprises a treatment head shell, an equipment area provided in the treatment head shell, a hollow cavity with an open side in the equipment area, and a plurality of treatment lamps installed in the equipment area. A transparent protective cover is installed on the light irradiation side of the equipment area. The side opposite to the light irradiation side in the equipment area is an equipment installation side, and a plurality of movable lamp holders are assembled on the equipment installation side. The treatment head can divide the light radiated by the treatment head into different treatment areas according to the light intensity, and the range and position of the treatment area can be quickly adjusted according to the treatment requirements of patients, so that unnecessary treatment light irradiation on the body surface of the patients is reduced, and the light energy consumption during the treatment of the patients is reduced.

Description

Technical Field

[0001] This invention relates to the field of phototherapy devices, and more specifically, to a treatment head for a phototherapy device that reduces phototherapy energy consumption. Background Technology

[0002] Phototherapy devices use the 0.4-3.6μm wavelength band to irradiate the surface of the human body or cavity. Through the photothermal combined effect, they can effectively kill diseased cells and tissues, coagulate mucosal tissues, and coagulate and block blood vessels, thereby achieving the purpose of cure.

[0003] For example, the Chinese patent phototherapy device with authorization announcement number CN110234397B includes a flexible substrate, a plurality of LED chips arranged in an array on the flexible substrate, a flexible wall surrounding the plurality of LED chips, and a protective resin formed in a flexible manner to transmit emitted light emitted from the plurality of LED chips and to cover the plurality of light-emitting elements on the inner side of the wall, thereby radiating the emitted light from the area surrounded by the wall.

[0004] Because different areas of the human body are damaged to varying degrees, different intensities of light can be used to treat different areas.

[0005] In existing technologies, when the treatment head divides the treatment area into zones according to light intensity, the zone range is either not adjustable or difficult to adjust. Since different patients have different surface lesions, in order to ensure the treatment effect, the range of each treatment zone is increased to ensure the phototherapy effect. However, this results in some light shining on the patient's skin that does not need treatment, causing a waste of light energy and increasing the consumption of light energy. Summary of the Invention

[0006] 1. Technical problems to be solved

[0007] To address the problems existing in the prior art, the purpose of this invention is to provide a treatment head for a phototherapy device that reduces light energy consumption. It can divide the light emitted by the treatment head into different treatment areas according to its light intensity, and the range and position of the treatment areas can be quickly adjusted according to the patient's treatment needs, reducing unnecessary light irradiation on the patient's body surface and reducing light energy consumption during patient treatment.

[0008] 2. Technical Solution

[0009] To solve the above problems, the present invention adopts the following technical solution.

[0010] A treatment head for a phototherapy device that reduces light energy consumption includes a treatment head housing and a device area opened inside the treatment head housing. The device area has a hollow cavity with an opening on one side, and the side of the device area with the opening is the light irradiation side. Multiple treatment lamps are installed inside the device area, and a transparent protective cover is installed on the light irradiation side of the device area.

[0011] The side of the equipment area opposite to the light irradiation side is the equipment installation side. Multiple movable lamp holders are mounted on the equipment installation side. Multiple therapeutic lamps are respectively mounted on the multiple movable lamp holders, and the multiple movable lamp holders can slide horizontally in any direction on the equipment installation side.

[0012] The two adjacent treatment lamps move away from each other, and a guide connector is provided between the two adjacent treatment lamps;

[0013] The equipment area is equipped with multiple external belt adjustment components, each with an external limiting belt. The external limiting belt is located on the outside of multiple therapeutic lamps, and the area inside the external limiting belt is a diffused light area. The multiple therapeutic lamps are evenly distributed within the diffused light area. The external belt adjustment components can adjust the range and position of the external limiting belt.

[0014] The equipment area is further provided with multiple inner belt adjustment components, and multiple outer belt adjustment components are provided with inner limiting belts. The inner limiting belts are located on the outside of any multiple treatment lamps. The area inside the inner limiting belts is a concentrated light area. The inner belt adjustment components are used to adjust the range and position of the inner limiting belts.

[0015] Furthermore, the movable lamp holder includes a lamp holder body, on which a second magnet is provided that is magnetically attracted to the device mounting side. A power connector is provided in the middle of the lamp holder body, and the movable lamp holder is mounted on the power connector and electrically connected to it. Multiple first magnets are fixedly connected to the periphery of the lamp holder body, and the first magnets of two adjacent movable lamp holders repel each other magnetically.

[0016] Furthermore, the guide connector includes two guide rails, which are respectively fixedly connected to the opposite side walls of the two lamp holder bodies, and each of the two guide rails has a horizontally slidable carriage inside, with a support rod rotatably connected between the two carriages.

[0017] Furthermore, both the outer and inner limiting bands include an automatic winding component, on which a lamp limiting band is mounted. The lamp limiting band surrounds the outside of multiple movable lamp holders and is located on the side of the guide rail closer to the movable lamp holders. The outer band adjustment component is connected to the lamp limiting band of the outer limiting band, and the inner band adjustment component is connected to the lamp limiting band of the inner limiting band.

[0018] Furthermore, the automatic winding component includes a winding unit connected to the lamp limiting strip, and the winding unit is provided with an elastic reset component;

[0019] The winding unit includes a small housing, a small motor is fixedly connected to the small housing, a rotating rod located inside the small housing is fixedly connected to the output end of the small motor, a winding ring is fixedly connected to the outside of the rotating rod, and both ends of the lamp limiting strip extend into the interior of the small housing and are connected to the winding ring.

[0020] The elastic reset component is a spiral spring installed inside the small housing. The outer end of the spiral spring is fixedly connected to the small housing, and the inner end of the spiral spring is fixedly connected to the rotating rod. At this time, the elasticity of the spiral spring can drive the winding ring to rotate.

[0021] Furthermore, both the outer and inner belt adjustment components include a side frame fixedly connected inside the equipment area. A multi-degree-of-freedom manipulator is mounted on the side frame, and a miniature electric push rod is installed on the multi-degree-of-freedom manipulator. The output end of the miniature electric push rod is fixedly connected to a belt ring. The belt ring of the outer belt adjustment component is located outside the lamp limit belt of the outer limit belt, and the belt ring of the inner belt adjustment component is located outside the lamp limit belt of the inner limit belt.

[0022] 3. Beneficial effects

[0023] Compared with the prior art, the advantages of this invention are:

[0024] (1) This solution can quickly adjust the position of the treatment lamps through the outer and inner limiting bands, so that some treatment lamps are concentrated together to treat the key treatment areas on the patient's body surface, while the other more dispersed treatment lamps treat the other treatment areas on the patient's body surface. Thus, the light emitted by the treatment head is divided into different treatment areas according to the light intensity, and the range and position of the treatment area can be quickly adjusted according to the patient's treatment needs, thereby reducing unnecessary treatment light irradiation on the patient's body surface, reducing the light energy consumption during patient treatment, and reducing power consumption. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 This is a partial structural diagram of the present invention;

[0027] Figure 3 For the present invention Figure 2 A top-view structural diagram;

[0028] Figure 4This is a schematic diagram of the structure of the therapeutic lamp of the present invention;

[0029] Figure 5 For the present invention Figure 4 A partial sectional side view;

[0030] Figure 6 This is a schematic diagram of the structure of the guide connector of the present invention;

[0031] Figure 7 This is a schematic diagram of the structure of the external or internal adjustment component of the present invention;

[0032] Figure 8 This is a schematic diagram of the structure of the automatic winding component of the present invention;

[0033] Figure 9 This is a schematic diagram of the cross-sectional structure of the automatic winding component of the present invention.

[0034] Explanation of the labels in the diagram:

[0035] 1. Treatment head housing; 2. Equipment area; 3. Treatment lamp; 4. Movable lamp holder; 5. Guide connector; 6. Outer limiting band; 7. Inner limiting band; 8. Outer band adjustment component; 9. Inner band adjustment component; 10. Transparent protective cover; 11. Lamp holder body; 12. First magnet; 13. Second magnet; 14. Power connector; 15. Guide rail; 16. Slide; 17. Support rod; 18. Side frame; 19. Multi-degree-of-freedom manipulator; 20. Miniature electric push rod; 21. Limiting ring; 22. Small housing; 23. Rotating rod; 24. Small motor; 25. Winding ring; 26. Spiral spring; 27. Lamp limiting band. Detailed Implementation

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0037] Example 1:

[0038] Please see Figure 1-9 A treatment head for a phototherapy device that reduces light energy consumption includes a treatment head housing 1 and a device area 2 opened inside the treatment head housing 1. The device area 2 has a hollow cavity with an opening on one side, and the side with the opening is the light irradiation side. Multiple treatment lamps 3 are installed inside the device area 2. The light irradiated by the treatment lamps 3 can irradiate the outside through the light irradiation side. A transparent protective cover 10 is installed on the light irradiation side of the device area 2 to seal the device area 2 and protect the electrical components inside the device area 2.

[0039] Please see Figure 2-3 As shown, in order to adjust the position of the treatment lamp 3, the side of the equipment area 2 opposite to the light irradiation side is the equipment installation side. Multiple movable lamp holders 4 are mounted on the equipment installation side. Multiple treatment lamps 3 are respectively mounted on multiple movable lamp holders 4, and multiple movable lamp holders 4 can slide horizontally in any direction on the equipment installation side. The position of the treatment lamp 3 can be adjusted by sliding the movable lamp holders 4.

[0040] In order to enable multiple treatment lamps 3 to be automatically and evenly arranged, two adjacent treatment lamps 3 move away from each other. In order to enable multiple treatment lamps 3 to be arranged in an array, a guide connector 5 is provided between two adjacent treatment lamps 3 to guide the position of the guide connector 5.

[0041] Furthermore, the core of this technical solution lies in the fact that the equipment area 2 is provided with multiple external belt adjustment components 8, and multiple external belt adjustment components 8 are provided with external limiting belts 6. At this time, the external limiting belts 6 are located on the outside of multiple therapeutic lamps 3, and the area inside the external limiting belts 6 is the diffused light area. Multiple therapeutic lamps 3 are evenly distributed inside the diffused light area. The external belt adjustment components 8 can adjust the range and position of the external limiting belts 6, thereby adjusting the size and position of the diffused light area.

[0042] The equipment area 2 is also equipped with multiple inner belt adjustment components 9 and multiple outer belt adjustment components 8 with inner limit belts 7. The inner limit belts 7 are located on the outside of any multiple treatment lamps 3. The area inside the inner limit belts 7 is the concentrated light area. Multiple treatment lamps 3 selected by the inner limit belts 7 to be inside the key treatment area treat the patient's concentrated light area. The inner belt adjustment components 9 are used to adjust the range and position of the inner limit belts 7, thereby adjusting the size and position of the concentrated light area.

[0043] At this time, when using it, the user determines the treatment area on the patient's body surface that needs to be treated, and then determines the key treatment area on the body surface that needs more light irradiation.

[0044] After the treatment of the patient's body surface treatment area is completed, the user adjusts the range and size of the outer limiting band 6 by controlling the outer band adjustment component 8, so that the treatment light irradiated by the treatment lamp 3 inside the outer limiting band 6 is adapted to the patient's body surface treatment area. Then, multiple treatment lamps 3 are selected to be located inside the inner limiting band 7 by controlling the range and size of the inner limiting band 7 by controlling the outer band adjustment component 8, so that the inner limiting band 7 adjusts the position and spacing of the treatment lamps 3, so that the spacing between multiple treatment lamps 3 inside the concentrated light area is smaller, and more treatment light is concentrated to treat the patient's key treatment area.

[0045] This technical solution adjusts the position and spacing of the treatment lamps 3 by setting an outer limiting band 6 and an inner limiting band 7. By changing the spacing of the treatment lamps 3, the concentrated light area and the dispersed light area can radiate treatment light of different intensities. Among them, the treatment light with stronger intensity treats the key treatment areas on the body surface, and the position and size of the concentrated light area and the dispersed light area can be adjusted according to the patient's needs.

[0046] In summary, the technical solution in this embodiment can quickly adjust the position of the treatment lamps 3 through the outer limiting band 6 and the inner limiting band 7. This allows some of the treatment lamps 3 to be concentrated together to treat key treatment areas on the patient's body surface, while the remaining, more dispersed treatment lamps 3 can treat other treatment areas on the patient's body surface. As a result, the light emitted by the treatment head is divided into different treatment areas according to the light intensity, and the range and position of the treatment areas can be quickly adjusted according to the patient's treatment needs. This reduces unnecessary treatment light irradiation on the patient's body surface, reduces light energy consumption during patient treatment, and lowers power consumption.

[0047] Example 2:

[0048] Please see Figure 2-5 As shown, this embodiment discloses the structure of the movable lamp holder 4 based on embodiment 1. The movable lamp holder 4 includes a lamp holder body 11. A second magnet 13 is provided on the lamp holder body 11 and is magnetically attracted to the device mounting side, so that the second magnet 13 and the device mounting side are connected together and will not fall off easily. A power connector 14 is provided in the middle of the lamp holder body 11. The power connector 14 is connected to an external wire, and the movable lamp holder 4 is mounted on the power connector 14 and electrically connected to it. A plurality of first magnets 12 are fixedly connected to the periphery of the lamp holder body 11. The first magnets 12 of two adjacent movable lamp holders 4 repel each other magnetically, so that the two lamp holder bodies 11 move in a direction away from each other.

[0049] In summary, this embodiment uses magnetic force to complete the transmission between two adjacent lamp holder bodies 11 and the connection between the lamp holder body 11 and the device area 2, which greatly simplifies the structure.

[0050] Example 3:

[0051] Please see Figure 3-6As shown, this embodiment discloses a specific structure of a guide connector 5 based on embodiment 2. The guide connector 5 includes two guide rails 15, which are respectively fixedly connected to the opposite side walls of the two lamp holder bodies 11. The interior of each guide rail 15 is horizontally slidably connected to a slide 16. A support rod 17 is provided between the two slides 16 and rotatably connected to them. When the distance between two adjacent lamp holder bodies 11 changes, the angle of the support rod 17 will change to adapt to the change in the distance between the lamp holder bodies 11. Then, the connection of the support rod 17 will make multiple lamp holder bodies 11 form an integral structure.

[0052] Furthermore, when the distance between the two lamp holder bodies 11 is at its minimum, the support rod 17 is moved by the slide 16 to one end inside the guide rail 15. At this time, the slide 16 is located at the initial end of the guide rail 15. The initial end of the guide rail 15 is provided with a magnet that is magnetically attracted to the slide 16, which is used to automatically drive the slide 16 to reset.

[0053] Example 4:

[0054] Please see Figure 2 and Figure 8-9 As shown, both the outer limiting band 6 and the inner limiting band 7 include an automatic winding component. A lamp limiting band 27 is installed on the automatic winding component. The lamp limiting band 27 surrounds the outside of the multiple movable lamp holders 4, and the lamp limiting band 27 is located on the side of the guide rail 15 near the movable lamp holders 4 to avoid direct contact between the lamp limiting band 27 and the guide connector 5. The outer band adjustment component 8 is connected to the lamp limiting band 27 of the outer limiting band 6, and the inner band adjustment component 9 is connected to the lamp limiting band 27 of the inner limiting band 7. At this time, the lamp limiting band 27 can be adjusted by the automatic winding component to adjust its size to adapt to the adjustment made by the outer band adjustment component 8 and the inner band adjustment component 9.

[0055] Specifically, the automatic winding component includes a winding unit connected to the lamp limiting band 27 for winding the lamp limiting band 27, and the winding unit is provided with an elastic reset component for providing elasticity to the lamp limiting band 27 when preventing it from winding, so that the lamp limiting band 27 remains taut on the outside of the multiple treatment lamps 3.

[0056] Please refer to Figure 8-9As shown, the winding unit includes a small housing 22, on which a small motor 24 is fixedly connected. The output end of the small motor 24 is fixedly connected to a rotating rod 23 located inside the small housing 22. A winding ring 25 is fixedly connected to the outside of the rotating rod 23. Both ends of the lamp limiting band 27 extend into the interior of the small housing 22 and are connected to the winding ring 25. When adjusting the lamp limiting band 27, the small motor 24 is turned off, allowing the lamp limiting band 27 to remain taut under the action of the elastic reset member. After the lamp limiting band 27 is adjusted, the small motor 24 drives the winding ring 25 to rotate, thereby winding the lamp limiting band 27. This allows the lamp limiting band 27 to be pulled, pushing the treatment lamp 3 and adjusting its position.

[0057] The elastic reset component is a spiral spring 26 installed inside the small housing 22. The outer end of the spiral spring 26 is fixedly connected to the small housing 22, and the inner end of the spiral spring 26 is fixedly connected to the rotating rod 23. At this time, the elasticity of the spiral spring 26 can drive the winding ring 25 to rotate.

[0058] In summary, the automatic winding component adjusts the length of the lamp limiting band 27 located outside the treatment lamp 3, and can automatically adjust its length according to the adjustment of the outer band adjustment component 8 or the inner band adjustment component 9. Moreover, the structure of the automatic winding component is relatively simple and the cost is low.

[0059] Example 5:

[0060] Please see Figure 1-9 As shown, this embodiment discloses in detail a structure of the outer belt adjustment member 8 and the inner belt adjustment member 9 based on embodiment 4. Both the outer belt adjustment member 8 and the inner belt adjustment member 9 include a side frame 18 fixedly connected inside the equipment area 2. A multi-degree-of-freedom manipulator 19 is mounted on the side frame 18. A miniature electric push rod 20 is mounted on the multi-degree-of-freedom manipulator 19. The output end of the miniature electric push rod 20 is fixedly connected to a limiting belt ring 21. The limiting belt ring 21 of the outer belt adjustment member 8 is located outside the lamp limiting belt 27 of the outer limiting belt 6, and the limiting belt ring 21 of the inner belt adjustment member 9 is located inside the lamp limiting belt 7. Outside the limiting band 27, the multi-degree-of-freedom manipulator 19 drives the limiting band ring 21 to move horizontally, adjusting the position of multiple limiting band rings 21. This allows for the initial adjustment of the range and size of the lamp limiting band 27, positioning it outside the selected treatment lamp 3. Then, the micro electric push rod 20 is activated to move the limiting band ring 21, bringing the lamp limiting band 27 and the treatment lamp 3 to the same horizontal plane. This ensures the lamp limiting band 27 is secured to the outside of multiple treatment lamps 3. Finally, the multi-degree-of-freedom manipulator 19 is used to adjust the lamp limiting band 27 again.

[0061] Furthermore, in order to avoid mutual interference between multiple structures, the inner belt adjustment component 9 of the outer belt adjustment component 8 is located near the light illumination side of the moving lamp holder 4, and the multi-degree-of-freedom manipulator 19 of the inner belt adjustment component 9 is located near the light illumination side of the multi-degree-of-freedom manipulator 19 of the outer belt adjustment component 8.

[0062] In summary, this technical solution uses a multi-degree-of-freedom robotic arm 19 to adjust the position of the limiting ring 21, thereby enabling the free adjustment of the range and position of the lamp limiting band 27 according to requirements.

[0063] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A treatment head for a phototherapy device that reduces light energy consumption, comprising a treatment head housing (1) and a device area (2) formed inside the treatment head housing (1), characterized in that: The equipment area (2) has a hollow cavity with an opening on one side. The side of the equipment area (2) with the opening is the light irradiation side. Multiple therapeutic lamps (3) are installed inside the equipment area (2). A transparent protective cover (10) is installed on the light irradiation side of the equipment area (2). The side of the equipment area (2) opposite to the light irradiation side is the equipment installation side. Multiple movable lamp holders (4) are mounted on the equipment installation side. Multiple therapeutic lamps (3) are respectively mounted on multiple movable lamp holders (4), and multiple movable lamp holders (4) can slide horizontally in any direction on the equipment installation side. The two adjacent treatment lamps (3) move away from each other, and a guide connector (5) is provided between the two adjacent treatment lamps (3); The equipment area (2) is provided with a plurality of external belt adjustment components (8), and an external limiting belt (6) is provided on the plurality of external belt adjustment components (8). The external limiting belt (6) is located on the outside of the plurality of therapeutic lamps (3). The area inside the external limiting belt (6) is a diffused light area. The plurality of therapeutic lamps (3) are evenly distributed inside the diffused light area. The external belt adjustment components (8) can adjust the range and position of the external limiting belt (6). The equipment area (2) is also provided with multiple inner belt adjustment components (9), and multiple outer belt adjustment components (8) are provided with inner limit belts (7). The inner limit belts (7) are located on the outside of any multiple therapeutic lamps (3). The area inside the inner limit belts (7) is a concentrated light area. The inner belt adjustment components (9) are used to adjust the range and position of the inner limit belts (7).

2. The treatment head for a phototherapy device that reduces photoenergy consumption according to claim 1, characterized in that: The movable lamp holder (4) includes a lamp holder body (11), on which a second magnet (13) is provided and magnetically attracted to the device mounting side. A power connector (14) is provided in the middle of the lamp holder body (11), and the movable lamp holder (4) is mounted on the power connector (14) and electrically connected to it. A plurality of first magnets (12) are fixedly connected to the periphery of the lamp holder body (11), and the first magnets (12) of two adjacent movable lamp holders (4) repel each other magnetically.

3. The treatment head for a phototherapy device that reduces photoenergy consumption according to claim 2, characterized in that: The guide connector (5) includes two guide rails (15), which are fixedly connected to the opposite side walls of the two lamp holder bodies (11), and the interior of each guide rail (15) is horizontally slidably connected to a carriage (16), and a support rod (17) is provided between the two carriages (16) and rotatably connected thereto.

4. The treatment head for a phototherapy device that reduces photoenergy consumption according to claim 3, characterized in that: The initial end of the guide rail (15) is provided with a magnet that is magnetically attracted to the carriage (16).

5. The treatment head for a phototherapy device that reduces photoenergy consumption according to claim 3, characterized in that: Both the outer limiting band (6) and the inner limiting band (7) include an automatic winding component. A lamp limiting band (27) is installed on the automatic winding component. The lamp limiting band (27) surrounds the outside of multiple movable lamp holders (4) and is located on the side of the guide rail (15) near the movable lamp holders (4). The outer band adjusting component (8) is connected to the lamp limiting band (27) of the outer limiting band (6), and the inner band adjusting component (9) is connected to the lamp limiting band (27) of the inner limiting band (7).

6. The treatment head for a phototherapy device that reduces photoenergy consumption according to claim 5, characterized in that: The automatic winding component includes a winding unit connected to the lamp limiting band (27), and the winding unit is provided with an elastic reset component; The winding unit includes a small housing (22), on which a small motor (24) is fixedly connected. The output end of the small motor (24) is fixedly connected to a rotating rod (23) located inside the small housing (22). A winding ring (25) is fixedly connected to the outside of the rotating rod (23). Both ends of the lamp limiting strip (27) extend into the interior of the small housing (22) and are connected to the winding ring (25).

7. The treatment head for a phototherapy device that reduces photoenergy consumption according to claim 6, characterized in that: The elastic reset component is a spiral spring (26) installed inside the small housing (22). The outer end of the spiral spring (26) is fixedly connected to the small housing (22), and the inner end of the spiral spring (26) is fixedly connected to the rotating rod (23). At this time, the elasticity of the spiral spring (26) can drive the winding ring (25) to rotate.

8. The treatment head for a phototherapy device that reduces photoenergy consumption according to claim 5, characterized in that: Both the outer belt adjustment component (8) and the inner belt adjustment component (9) include a side frame (18) fixedly connected inside the equipment area (2). A multi-degree-of-freedom manipulator (19) is mounted on the side frame (18). A miniature electric push rod (20) is installed on the multi-degree-of-freedom manipulator (19). The output end of the miniature electric push rod (20) is fixedly connected to a limiting belt ring (21). The limiting belt ring (21) of the outer belt adjustment component (8) is located outside the lamp limiting belt (27) of the outer limiting belt (6). The limiting belt ring (21) of the inner belt adjustment component (9) is located outside the lamp limiting belt (27) of the inner limiting belt (7).

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