Photon therapeutic apparatus

Abstract

The invention discloses a photon therapeutic apparatus, and belongs to the technical field of medical instruments.The photon therapeutic apparatus comprises a machine body and a mechanical arm arranged on the machine body and further comprises a therapeutic head arranged on the mechanical arm, the therapeutic head comprises a first shell arranged on the mechanical arm, and a second shell is fixed in the first shell; a third shell is arranged in the second shell, and the treatment part is arranged in the third shell; wherein a first heat dissipation element is arranged in the first shell, a second heat dissipation element is fixed on the second shell, a third heat dissipation element is arranged in the third shell, and a heat dissipation channel is further arranged between the second shell and the third shell. The multi-stage heat dissipation device has the advantages that the third heat dissipation element conducts heat of the treatment part to the second heat dissipation element through the heat dissipation channel, and the heat is finally discharged out of the device through the first heat dissipation element, so that multi-stage heat dissipation is completed. And compared with a single heat dissipation mode in the prior art, the heat dissipation efficiency is remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a photon therapy device. Background Technology

[0002] Photon therapy devices are widely used in dermatology, rehabilitation medicine, and pain management. Essentially, they generate light of specific wavelengths that act on human tissues, utilizing the biostimulatory effect of light to achieve therapeutic goals. During the light energy generation process, electrical energy cannot be 100% converted into light energy; some energy is released as heat, which is the primary source of heat. Excessive heat accumulation can lead to overheating of the light source components, accelerating aging, or even causing them to burn out, affecting the stability of the treatment effect and the lifespan of the device. Therefore, heat dissipation is necessary.

[0003] Current traditional photon therapy devices mostly use fans for heat dissipation. This mode is highly dependent on air convection, and its heat dissipation efficiency is significantly affected by ambient temperature. This single heat dissipation mode leads to an efficiency bottleneck: when the room temperature rises or the devices are running densely, the air heat exchange capacity drops sharply. The light source module is prone to power reduction due to delayed heat dissipation, which may even interrupt the treatment process and make it difficult to meet the needs of continuous clinical operation. Summary of the Invention

[0004] To address the aforementioned technical shortcomings, the purpose of this invention is to provide a photon therapy device that solves the problem of low heat dissipation efficiency in the heat dissipation module of existing photon therapy devices.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: The present invention provides a photon therapy device, including a body and a robotic arm disposed on the body, and further including: a treatment head disposed on the robotic arm, the treatment head including a first outer shell disposed on the robotic arm, a second outer shell fixed inside the first outer shell, a third outer shell disposed inside the second outer shell, and a treatment part disposed inside the third outer shell; wherein, a first heat dissipation element is disposed inside the first outer shell, a second heat dissipation element is fixed on the second outer shell, a third heat dissipation element is disposed inside the third outer shell, and a heat dissipation channel is also provided between the second outer shell and the third outer shell, the third heat dissipation element conducts the heat of the treatment part to the second heat dissipation element through the heat dissipation channel, and finally the heat is discharged outside the device by the first heat dissipation element, thereby completing multi-stage heat dissipation.

[0006] Optionally, the first outer shell is vertically continuous and hollow inside, and the first outer shell has a first wide opening facing one end of the second outer shell, a second wide opening away from one end of the second outer shell, and a narrow opening connecting the first wide opening and the second wide opening.

[0007] Optionally, the first heat dissipation element is a first fan, which is fixed inside the second wide opening, and a plurality of first air vents are provided on the side wall of the second wide opening corresponding to the position of the first fan.

[0008] Optionally, the second housing is fixed inside the first wide opening, and the second housing has a plurality of first openings. The second heat dissipation element includes a heat receiving part, which is fixed at the position of the second housing corresponding to the first opening. There is a first gap between the heat receiving part and the first opening. All the heat receiving parts are interconnected through a plurality of second pipes. The second pipes are filled with a heat dissipation medium, and a plurality of heat dissipation fins are fixed on the second pipes.

[0009] Optionally, the third outer shell has a second opening corresponding to the first opening, and the first opening extends into the second opening to form an air duct.

[0010] Optionally, a cavity is further provided between the third outer shell and the second outer shell, and the cavity is filled with a heat dissipation medium.

[0011] Optionally, the third heat dissipation element includes a second fan, which is fixed inside the third housing at a position corresponding to the second opening.

[0012] Optionally, a second gap is provided between the third housing and the treatment unit, and the third heat dissipation element draws air from the second gap and exhausts air from the heat dissipation channel.

[0013] Optionally, the cavity has an outlet end and an inlet end formed on the second outer shell, the outlet end and the inlet end being respectively connected to a first pipeline and a third pipeline, the first pipeline and the third pipeline being connected to the second pipeline, and a circulation pump for driving is provided on the first pipeline.

[0014] Optionally, the heat dissipation fins are provided with a number of protrusions, and the sides of the heat dissipation fins are provided with a number of serrations.

[0015] The beneficial effects of this invention are as follows: This invention employs a nested structure of a third outer shell, a second outer shell, and a first outer shell. Each outer shell is equipped with a third heat dissipation element, a second heat dissipation element, and a first heat dissipation element, respectively. This multi-level heat dissipation architecture significantly improves heat dissipation efficiency. A heat dissipation channel is formed between the second and third outer shells. The third heat dissipation element conducts heat generated by the treatment unit through this channel to the second heat dissipation element, and finally, the heat is dissipated outside the device by the first heat dissipation element. This multi-level heat transfer process significantly improves heat dissipation efficiency compared to the single heat dissipation mode of existing technologies.

[0016] Meanwhile, the cavity between the second and third outer shells is filled with a heat dissipation medium. The heat generated during the operation of the treatment unit is conducted through the first heat dissipation element and then collected in the heat dissipation medium. The heat dissipation medium dissipates the heat through a circulation mechanism, further enhancing the heat dissipation efficiency.

[0017] In addition, the second heat dissipation element may be (but is not limited to) a combination structure of a heat receiving part, a second pipe and heat dissipation fins: the hot air in the heat dissipation channel is collected by the heat receiving part and discharged through the second pipe and heat dissipation fins; at the same time, the heat dissipation medium circulating in the second pipe can carry away the heat, further improving the heat dissipation efficiency.

[0018] In summary, the present invention achieves multi-level heat dissipation, multi-medium heat dissipation, and rapid heat conduction of the treatment area through the synergistic effect of the first heat dissipation element, the heat dissipation channel, the second heat dissipation element, and the third heat dissipation element, which significantly improves the heat dissipation efficiency of the photon therapy device compared with the prior art. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the 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.

[0020] Figure 1 This is an overall structural diagram of a photon therapy device according to the present invention.

[0021] Figure 2 This is a three-dimensional structural diagram of the treatment head of a photon therapy device according to the present invention.

[0022] Figure 3 This is a three-dimensional sectional view of the treatment head of a photon therapy device according to the present invention.

[0023] Figure 4 This is a three-dimensional exploded view of the treatment head of a photon therapy device according to the present invention.

[0024] Figure 5 This is a partial top cross-sectional view of the treatment head of a photon therapy device according to the present invention.

[0025] Figure 6 This invention relates to a photon therapy device. Figure 5 Enlarged view of point A in the middle.

[0026] Figure 7 This invention relates to a photon therapy device. Figure 4 Enlarged view of point B in the middle.

[0027] Figure 8 This invention relates to a photon therapy device. Figure 2 A magnified view of point C in the middle.

[0028] Explanation of reference numerals in the attached figures: 1. Body; 2. Robotic arm; 3. Treatment head; 31. First outer shell; 311. First air vent; 312. First fan; 313. First wide opening; 314. Second wide opening; 315. Narrow opening; 32. Second outer shell; 321. First pipeline; 322. Second pipeline; 323. Third pipeline; 324. Circulation pump; 325. Heat dissipation fins; 3251. Serrations; 3252. Protrusion; 326. Heat receiving part; 3261. First gap; 327. First opening; 33. Third outer shell; 331. Second fan; 332. Second opening; 34. Cavity; 35. Air duct; 36. Treatment part; 361. Second gap. Detailed Implementation

[0029] 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 described embodiments 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 skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] As mentioned earlier, most traditional photon therapy devices currently use fans for heat dissipation. This mode is highly dependent on air convection, and its heat dissipation efficiency is significantly affected by ambient temperature. This single heat dissipation mode leads to an efficiency bottleneck: when the room temperature rises or the devices are running densely, the air heat exchange capacity drops sharply. The light source module is prone to power reduction due to delayed heat dissipation, which may even interrupt the treatment process and make it difficult to meet the needs of continuous clinical operation.

[0031] To address this issue, the present invention provides a photon therapy device with improvements to its treatment head. The synergistic effect of the first heat dissipation element, heat dissipation channel, second heat dissipation element, and third heat dissipation element achieves multi-level heat dissipation, multi-medium heat dissipation, and rapid heat conduction of the treatment area, significantly improving the heat dissipation efficiency of the photon therapy device compared to existing technologies. This solves the problems in the prior art. The present invention achieves this solution through the following methods.

[0032] Example 1: Please refer to the instruction manual appendix. Figures 1 to 8As shown in the figure, this embodiment provides a photon therapy device, which includes a body 1, a robotic arm 2 mounted on the body 1, and a treatment head 3 mounted on the robotic arm 2. The treatment head 3 includes a first outer shell 31, a second outer shell 32, and a third outer shell 33 nested together. That is, the second outer shell 32 is fixed inside the first outer shell 31 (the first outer shell 31 is fixed to the robotic arm 2), the third outer shell 33 is disposed inside the second outer shell 32, and the treatment part 36 is fixed inside the third outer shell 33 (a second gap 361 exists between the third outer shell 33 and the treatment part 36, and several small holes are opened on the third outer shell 33 in this gap, allowing airflow to enter the space between the third outer shell 33 and the treatment part 36 through these small holes). Light of a specific wavelength is generated by the treatment part 36 on the treatment head 3, acting on human tissue, and using the biostimulation effect of light to treat the patient's affected area.

[0033] In this first embodiment, as Figures 2 to 3 As shown, the first outer shell 31 is made of structural metal / high-strength plastic (e.g., aluminum alloy, which can support the nested structure, provide protection for the outermost layer, reduce weight, and conduct some heat). The first outer shell 31 is hollow inside, with a through-hole at the top and bottom. It has a first through-hole near the second outer shell 32 and a second through-hole away from the second outer shell 32. A first fan 312 (i.e., a first heat dissipation element) is installed in the second through-hole. The first fan 312 is a centrifugal fan that can guide air from the first through-hole to the second through-hole and blow it out from the side of the first outer shell 31. Therefore, corresponding to the position of the first fan 312, a first air vent 311 is provided on the first outer shell 31.

[0034] In this first embodiment, as Figures 2 to 7 As shown, the second outer shell 32 is made of a thermally conductive structural metal material (such as aluminum alloy, whose high thermal conductivity allows it to conduct heat to other components). The second outer shell 32 is fixed inside the first through-hole of the first outer shell 31. Several evenly distributed first openings 327 are provided in the upper middle part of the second outer shell 32. A heat-receiving part 326 is fixed at the position corresponding to the first opening 327 on the second outer shell 32. A first gap 3261 exists between the heat-receiving part 326 and the first opening 327 for airflow. All heat-receiving parts 326 are interconnected through three layers of second pipes 322. The heat-receiving parts 326 are also hollow inside and connected to the interior of the second pipes 322, serving as a transfer station for the three layers of second pipes 322.

[0035] The second conduit 322 is made of a high thermal conductivity and pressure-resistant metal with good sealing properties and a balanced thermal conductivity / ductility (e.g., oxygen-free copper, which can circulate the heat dissipation medium and quickly conduct heat away while withstanding system pressure and medium corrosion). The second conduit 322 is filled with a heat dissipation medium, which circulates between the three layers of the second conduit 322 via the heat receiving section 326. Several heat dissipation fins 325 are also fixed to the second conduit 322. Therefore, the hot airflow from between the heat receiving section 326 and the first port 327 can be effectively dissipated through the heat dissipation fins 325. The aforementioned heat receiving section 326, second conduit 322, and heat dissipation fins 325 together constitute the second heat dissipation element.

[0036] In this first embodiment, as Figures 1 to 6 As shown, the third outer shell 33 is made of a high thermal conductivity metal with ultra-high thermal conductivity and high temperature resistance (e.g., oxygen-free copper, which is in direct contact with the heat source and needs to quickly absorb and conduct heat to avoid local overheating). The top of the treatment unit 36 ​​is a certain distance away from the third outer shell 33, and a second fan 331 (i.e., a second heat dissipation element) is fixed within this distance. The second fan 331 is fixed inside the third outer shell 33 at the position corresponding to the second opening 332. At the same time, the third outer shell 33 has a second opening 332 corresponding to the first opening 327. The first opening 327 extends to the second opening 332 to form an air duct 35 (i.e., a heat dissipation channel). The second fan 331 is also a centrifugal fan. During use, the treatment unit 36 ​​dissipates heat during operation, thereby heating the air and causing the hot air to rise. The operation of the second fan 331 generates negative pressure, drawing in the rising hot air and discharging it from the side into the air duct 35.

[0037] In this first embodiment, as Figures 4 to 5 As shown, a cavity 34 (sealed) is provided between the third outer shell 33 and the second outer shell 32. The cavity 34 is filled with a heat dissipation medium (such as water, ethylene glycol aqueous solution, heat transfer oil, or liquid metal). Therefore, during use, the heat dissipated by the treatment unit 36 ​​can be conducted from the side wall of the third outer shell 33 to the heat dissipation medium, which circulates, thereby carrying away heat and assisting in heat dissipation. The cavity 34 has an outlet end and an inlet end located on the second outer shell 32. The outlet end and inlet end are respectively connected to and fixed with a first pipe 321 and a third pipe 323. Both the first pipe 321 and the third pipe 323 are connected to a second pipe 322. A circulation pump 324 is installed on the first pipe 321 for driving the circulation. Thus, the heat dissipation medium in the cavity 34 and the heat dissipation medium in the second pipe 322 are interconnected and circulated by the circulation pump 324, thereby dissipating heat.

[0038] Therefore, in the specific implementation of this embodiment, the heat dissipated by the treatment unit 36 ​​during operation will undergo the following heat dissipation process: First, a portion of the heat is transported to the air duct 35 via the second fan 331 and blown onto the heat receiving part 326. The heat receiving part 326 is made of a high-temperature strength, fatigue-resistant, and high thermal conductivity metal material (e.g., copper, which directly contacts the high-temperature airflow of the heat channel and needs to efficiently collect heat and transfer it to the piping system). Heat is dissipated by the heat dissipation medium circulating in the heat receiving part 326 and the second pipe 322, while the heat exiting from the side of the first gap 3261 is carried away by the heat dissipation fins 325 (some of the heat dissipated from the second pipe 322 is also carried away by the heat dissipation fins 325).

[0039] Then, another portion of the heat comes into contact with the third outer shell 33 and is conducted into the heat dissipation medium in the cavity 34. It is carried away by the heat dissipation medium and eventually enters the second pipe 322 and is carried away by the heat dissipation fins 325 (some of it will also be conducted to the second outer shell 32 and eventually discharged).

[0040] Finally, the heat conducted through the above two processes enters the first housing 31 through the first through-hole, is attracted by the negative pressure generated by the first fan 312, and is finally discharged from the first air vent 311, thus completing multi-stage heat dissipation.

[0041] Example 2: Based on the above embodiments, in order to further clarify and completely explain the technical solutions therein, the present invention also provides an embodiment two. For example... Figures 2 to 4 As shown in this second embodiment, the first outer shell 31 is vertically open and hollow inside. The first outer shell 31 has a first wide opening 313 facing the second outer shell 32, a second wide opening 314 away from the second outer shell 32, and a narrow opening 315 connecting the first wide opening 313 and the second wide opening 314. In use, the heat discharged through the second outer shell 32 enters through the first wide opening 313, enters through the narrow opening 315 into the second wide opening 314, and is finally discharged from the first air vent 311.

[0042] When heat (hot air) flows in the first outer casing 31, the mass passing through any cross-section per unit time is constant. As heat (hot air) enters the narrow opening 315 from the first wide opening 313, the cross-section becomes smaller. In order to maintain a constant mass flow rate, the flow velocity of heat (hot air) will increase. According to Bernoulli's principle, when the flow velocity increases, the dynamic pressure increases and the static pressure decreases. This will create a low-pressure area in the narrow opening 315. When heat (hot air) passes through this low-pressure area, that is, when it enters the second wide opening 314 from the narrow opening 315, the flow cross-sectional area increases, and conversely, the flow velocity will increase. Using the negative pressure generated by the first fan 312 as the airflow pressure source, the heat (hot air) flowing out of the second outer casing 32 can flow out of the first outer casing 31 at a faster speed, thereby improving the heat dissipation efficiency.

[0043] Example 3: Based on the above embodiments, in order to provide a clearer and more complete explanation of the technical solutions therein, the present invention also provides an embodiment three, such as... Figure 7 As shown, in this third embodiment, the heat dissipation fin 325 is provided with a plurality of protrusions 3252, and the side of the heat dissipation fin 325 is provided with a plurality of serrations 3251.

[0044] The serrated edges 3251 and the protrusions 3252 on the side of the heat sink 325 generate numerous microscopic disturbances when airflow passes over them. These disturbances effectively disrupt the low-speed, high-heat laminar flow (thermal boundary layer) that is tightly attached to the surface of the heat sink 325. After the boundary layer is disrupted, the hot air is more easily carried away by the mainstream airflow, while forcing more underheated cold air to directly impact the surface of the heat sink 325.

[0045] Meanwhile, the protrusion 3252 is a three-dimensional raised structure, increasing the actual surface area in contact with air. Simultaneously, the serrations 3251, with their dense, uneven contours, extend the airflow contact path on the side of the heat dissipation fins 325. The combined effect of these two features significantly increases the heat dissipation area per unit volume of the heat dissipation fins 325, particularly facilitating the more efficient dissipation of heat concentrated at the root of the protrusion 3252 (typically corresponding to the core heat source area). This significantly improves local heat exchange efficiency.

[0046] Therefore, in summary, the present invention and its embodiments have advantages over the prior art, including but not limited to the following: (1) The present invention employs a nested structure of a third outer shell 33, a second outer shell 32, and a first outer shell 31, each outer shell being equipped with a third heat dissipation element, a second heat dissipation element, and a first heat dissipation element, thereby significantly improving heat dissipation efficiency through a multi-level heat dissipation architecture. Among them, a heat dissipation channel is formed between the second outer shell 32 and the third outer shell 33, through which the third heat dissipation element can conduct the heat generated by the treatment unit 36 ​​to the second heat dissipation element, and finally dissipate it outside the device by the first heat dissipation element, realizing a multi-level heat transfer process, which greatly improves heat dissipation efficiency compared with the single heat dissipation mode of the prior art.

[0047] (2) The cavity 34 between the second outer shell 32 and the third outer shell 33 of the present invention is filled with a heat dissipation medium. The heat generated by the treatment unit 36 ​​during operation is conducted through the first heat dissipation element and then collected in the heat dissipation medium. The heat dissipation medium dissipates the heat through a circulation mechanism, further enhancing the heat dissipation efficiency.

[0048] (3) The second heat dissipation element of the present invention may be (but is not limited to) a combination structure of heat receiving part 326, second pipe 322 and heat dissipation fins 325: the hot air in the heat dissipation channel is collected by heat receiving part 326 and discharged through second pipe 322 and heat dissipation fins 325; at the same time, the heat dissipation medium circulating in the second pipe 322 can carry away the heat simultaneously, further improving the heat dissipation efficiency.

[0049] (4) The first housing 31 of the present invention has a first wide opening 313, a narrow opening 315, and a second wide opening 314. Heat (hot air) enters from the first wide opening 313, and after passing through the low-pressure area formed by the narrow opening 315, it enters the second wide opening 314 and the flow rate increases. This allows it to be discharged from the device more quickly, thereby helping to improve heat dissipation efficiency.

[0050] (5) The heat dissipation fins 325 of the present invention have a plurality of serrations 3251 and protrusions 3252. The two work together to significantly increase the heat dissipation area provided per unit volume of the heat dissipation fins 325, which is especially beneficial for dissipating the heat concentrated at the root of the protrusions 3252 (usually corresponding to the core area of ​​the heat source) more efficiently. This significantly improves the local heat exchange efficiency.

[0051] In summary, the present invention achieves multi-level heat dissipation, multi-medium heat dissipation, and rapid heat conduction of the treatment area through the synergistic effect of the first heat dissipation element, the heat dissipation channel, the second heat dissipation element, and the third heat dissipation element, which significantly improves the heat dissipation efficiency of the photon therapy device compared with the prior art.

[0052] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of this invention and its equivalents, this invention also intends to include these modifications and variations.

Claims

1. A photon therapy device, comprising a body (1) and a robotic arm (2) mounted on the body (1), characterized in that, Also includes: A treatment head (3) is mounted on a robotic arm (2). The treatment head (3) includes a first outer shell (31) mounted on the robotic arm (2), a second outer shell (32) is fixed inside the first outer shell (31), a third outer shell (33) is disposed inside the second outer shell (32), and a treatment part (36) is disposed inside the third outer shell (33). The first housing (31) is provided with a first heat dissipation element, the second housing (32) is fixed with a second heat dissipation element, the third housing (33) is provided with a third heat dissipation element, and a heat dissipation channel is provided between the second housing (32) and the third housing (33). The third heat dissipation element conducts the heat of the treatment part (36) to the second heat dissipation element through the heat dissipation channel, and finally discharges it outside the device by the first heat dissipation element, thereby completing multi-stage heat dissipation.

2. The photon therapy device as described in claim 1, characterized in that, The first outer shell (31) is open from top to bottom and hollow inside. The first outer shell (31) has a first wide opening (313) facing the second outer shell (32), a second wide opening (314) away from the second outer shell (32), and a narrow opening (315) connecting the first wide opening (313) and the second wide opening (314).

3. The photon therapy device as described in claim 2, characterized in that, The first heat dissipation element is a first fan (312), which is fixed inside the second wide opening (314). The side wall of the second wide opening (314) is provided with a plurality of first air vents (311) corresponding to the position of the first fan (312).

4. A photon therapy device as described in claim 2, characterized in that, The second outer shell (32) is fixed inside the first wide opening (313). The second outer shell (32) has a plurality of first openings (327). The second heat dissipation element includes a heat receiving part (326). The heat receiving part (326) is fixed on the second outer shell (32) at the position corresponding to the first opening (327). There is a first gap (3261) between the heat receiving part (326) and the first opening (327). All the heat receiving parts (326) are interconnected through a plurality of second pipes (322). The second pipes (322) are filled with heat dissipation medium. A plurality of heat dissipation fins (325) are fixed on the second pipes (322).

5. A photon therapy device as described in claim 4, characterized in that, The third outer shell (33) has a second opening (332) corresponding to the first opening (327), and the first opening (327) extends to the second opening (332) to form an air duct (35).

6. A photon therapy device as described in claim 5, characterized in that, There is also a cavity (34) between the third outer shell (33) and the second outer shell (32), and the cavity (34) is filled with a heat dissipation medium.

7. A photon therapy device as described in claim 5, characterized in that, The third heat dissipation element includes a second fan (331), which is fixed inside the third housing (33) at a position corresponding to the second port (332).

8. A photon therapy device as described in claim 1, characterized in that, There is a second gap (361) between the third outer shell (33) and the treatment part (36), and the third heat dissipation element draws air from the second gap (361) and exhausts air from the heat dissipation channel.

9. A photon therapy device as described in claim 6, characterized in that, The cavity (34) has an outlet end and an inlet end opened on the second outer shell (32). The outlet end and the inlet end are respectively connected to a first pipeline (321) and a third pipeline (323). The first pipeline (321) and the third pipeline (323) are both connected to the second pipeline (322). A circulation pump (324) for driving is provided on the first pipeline (321).

10. A photon therapy device as described in claim 4, characterized in that, The heat dissipation fins (325) are provided with several protrusions (3252), and the side of the heat dissipation fins (325) is provided with several serrations (3251).

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