Filter and therapeutic apparatus

Abstract

The application discloses a filter and therapeutic instrument, and relates to the technical field of medical instruments, which is applied to the therapeutic instrument, and comprises a shell assembly and a filter piece. The shell assembly is provided with a filter cavity. The cavity wall of the filter cavity is provided with oppositely arranged inlets and outlets along a first direction respectively. The inlets are arranged below the outlets along the first direction. The filter piece comprises a flow section and a storage section which are connected in communication. The flow section is arranged between the inlets and the outlets and is arranged to extend along a side perpendicular to the first direction. The storage section is protruded from a side of the flow section which is away from the outlets. The application can realize sufficient filtration of impurity liquid in the therapeutic instrument cavity by the filter, so as to ensure the service life of the therapeutic instrument.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a filter and a therapeutic device. Background Technology

[0002] In related technologies, the treatment device includes a treatment head and a handheld component. The interior of the treatment head and the handheld component together form a negative pressure cavity. The treatment head injects needles into the skin area of ​​the human body and achieves a cosmetic treatment effect on the human skin through negative pressure adsorption.

[0003] However, because there is no filter between the treatment head and the handheld device, impurities such as oil, blood, and water from the skin can easily seep into the handheld device during negative pressure adsorption. This contamination of the working parts within the handheld device can lead to malfunctions and ultimately affect the lifespan of the treatment device. Therefore, designing a filter that can effectively filter the impurities adsorbed by the treatment head is of paramount importance. Summary of the Invention

[0004] The main objective of this invention is to provide a filter and a therapeutic device that can effectively filter impurities in the liquid inside the therapeutic device, thereby ensuring the lifespan of the therapeutic device.

[0005] To achieve the above objectives, the present invention proposes a filter, which is applied to a therapeutic device. The filter includes a housing assembly and a filter element. The housing assembly has a filter chamber, and the wall of the filter chamber has an inlet and an outlet respectively disposed opposite to each other along a first direction. The inlet is located below the outlet along the first direction. The filter element includes a connected flow section and a storage section. The flow section is disposed between the inlet and the outlet and extends along a side perpendicular to the first direction. The storage section protrudes from the flow section on the side opposite to the outlet.

[0006] In one embodiment, one end of the flow section is blocked at the inlet.

[0007] In one embodiment, a liquid-separating part is further provided on one side of the filter chamber wall to form a buffer opening with the other side of the filter chamber wall, and the liquid-separating part is disposed between the filter element and the outlet.

[0008] In one embodiment, there are multiple liquid-separating parts, which are spaced apart along a first direction. Adjacent liquid-separating parts protrude along opposite sides of the filter cavity wall to form a buffer channel.

[0009] In one embodiment, the filter further includes a filter membrane that seals the outlet.

[0010] In one embodiment, two limiting portions are protruding from the inner wall of the filter chamber, and the two limiting portions are arranged perpendicularly to the first direction to form a limiting groove, and the filter membrane is inserted into the limiting groove.

[0011] In one embodiment, the outer diameter of the flow section gradually expands along a direction perpendicular to the first direction. In one embodiment, the housing assembly includes a first housing and a second housing, the first housing having a first mounting surface and the second housing having a second mounting surface, one of the first mounting surface and the second mounting surface having a protruding welding station and the other having a recessed weld seam, the welding station being welded to the weld seam so that the first housing and the second housing enclose the filter cavity.

[0012] In one embodiment, one of the first mounting surface and the second mounting surface is recessed with a sealing groove, and the other is protruding with a snap-fit ​​portion. The snap-fit ​​portion is inserted into and limited in the sealing groove, and a sealant is filled between the snap-fit ​​portion and the groove wall of the sealing groove.

[0013] In one embodiment, the filter element is made of a hydrophilic material.

[0014] The present invention also proposes a therapeutic device, which includes a treatment head, a handheld component, a negative pressure generating component, and a filter as described above. The treatment head is used to perform negative pressure adsorption on the treatment area. The inlet is connected to the side of the treatment head away from the treatment area. One side of the handheld component is connected to the outlet. The negative pressure generating component is connected to the other side of the handheld component.

[0015] In the technical solution of this invention, air and impurity liquid are introduced through the inlet and then flow along the flow section. Since the flow section and the storage section have certain filtration performance, impurities can be filtered. Furthermore, it is worth noting that the first direction is the direction of gravity when the filter is used. Under the action of gravity, impurities settle in the storage section, ultimately ensuring that only air flows out of the outlet. This prevents impurities from flowing into the handheld component and contaminating the working parts or clogging the adsorption channel, thus ensuring the service life of the therapeutic device. Attached Figure Description

[0016] 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 the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of an embodiment of the filter provided by the present invention; Figure 2 for Figure 1 The diagram shows the exploded structure of the filter. Figure 3 for Figure 1 The diagram shows a cross-sectional structure of the filter after the first and second tubes are hidden. Figure 4 for Figure 1 Schematic diagram of the cross-sectional structure of the middle shell assembly; Figure 5 for Figure 4 A magnified structural diagram of point A in the middle.

[0018] Reference numerals: 10. Filter; 1. Housing assembly; 11. First housing; 111. First mounting surface; 1111. Weld; 1113. Snap-fit ​​part; 113. Positioning part; 1131. Mounting hole; 115. First tube body; 116. Second tube body; 13. Second housing; 131. Second mounting surface; 1311. Welding station; 1313. Sealing groove; 133. Connecting hole; 135. Limiting part; 1351. Limiting groove; 15. Filter chamber; 151. Inlet; 153. Outlet; 155. Liquid separator; 1551. Buffer channel; 1553. Buffer port; 3. Filter element; 31. Flow section; 33. Storage section; 331. Notch; 5. Filter membrane.

[0019] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] 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 a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0022] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0023] Currently, the treatment heads of similar mainstream medical aesthetic devices lack filter structures or have poor filtration effects. As a result, the treatment head, handheld components, and main unit are easily contaminated by impurities such as oil, blood, and water from the skin during normal use. This reduces the safety of the treatment head, handheld components, and main unit, increases the failure rate, and consequently affects the user experience and the lifespan of the device.

[0024] In related technologies, the treatment device includes a treatment head and a handheld component. The interior of the treatment head and the handheld component together form a negative pressure cavity. The treatment head injects needles into the skin area of ​​the human body and achieves a cosmetic treatment effect on the human skin through negative pressure adsorption.

[0025] However, because there is no filter between the treatment head and the handheld device, impurities such as oil, blood, and water from the skin can easily seep into the handheld device during negative pressure adsorption. This contamination of the working parts within the handheld device can lead to malfunctions and ultimately affect the lifespan of the treatment device. Therefore, designing a filter that can effectively filter the impurities adsorbed by the treatment head is of paramount importance.

[0026] To address the aforementioned problems, the present invention proposes a filter 10, which aims to achieve sufficient filtration of impurities in the liquid within the cavity of the therapeutic device, thereby ensuring the service life of the therapeutic device.

[0027] Reference Figures 1 to 5In one embodiment of the present invention, the filter 10 is applied to a therapeutic device. The filter 10 includes a housing assembly 1 and a filter element 3. The housing assembly 1 is provided with a filter cavity 15. The cavity wall of the filter cavity 15 is respectively provided with an inlet 151 and an outlet 153 disposed opposite to each other along a first direction. The inlet 151 is disposed below the outlet 153 along the first direction. The filter element 3 includes a flow section 31 and a storage section 33 that are connected. The flow section 31 is disposed between the inlet 151 and the outlet 153 and extends along a side perpendicular to the first direction. The storage section 33 protrudes from the side of the flow section 31 away from the outlet 153.

[0028] The filter element 3 preferably uses a hydrophilic material that can adsorb liquids for filtering them. It can be a sponge, fiber, filter screen, gauze, or other filter media, or a combination of multiple materials. Its material is loose and porous and also has a certain adsorption function, allowing impurities to flow from the flow section 31 to the storage section 33 inside the filter element 3. In some embodiments, the impurities include skin oils, skin debris, blood, tissue fluid, water, and other skin-related impurities. The impurities are a mixture of liquids and particulate matter, and can also be called impurity liquids. When the filter 10 is applied to a therapeutic device, the negative pressure generated by the therapeutic device will adsorb the skin and draw the aforementioned impurity liquids into the filter 10.

[0029] In the technical solution of this invention, the operator first holds the treatment device, positioning the treatment head of the device towards the skin area in a first direction, which is the direction of gravity. The inlet 151 of the filter 10 is connected to the treatment head, pointing downwards in the direction of gravity. Then, air and impurity liquid are introduced into the filter chamber 15 through the inlet 151 and flow along the flow section 31. Since the flow section 31 and the storage section 33 have certain water absorption and filtration properties, they can adsorb moisture in the impurity liquid and filter particulate matter. Furthermore, it is worth noting that because the inlet 151 of the filter 10 is positioned downwards in the direction of gravity, under the influence of gravity, particulate matter and some liquid in the impurity liquid will also settle in the storage section 33. Ultimately, the outlet 153 will only allow air to flow out as much as possible, thus preventing impurity liquid from flowing into the handheld part of the treatment device and causing contamination of the working parts or blockage of the adsorption channel, thereby ensuring the service life of the treatment device.

[0030] Reference Figure 3 In one embodiment of the present invention, one end of the flow section 31 is blocked at the inlet 151.

[0031] In this embodiment, one end of the flow section 31 is blocked at the inlet 151. This allows the impurity liquid to flow along the flow section 31 as much as possible after it is introduced into the inlet 151, preventing the filtered impurity liquid from flowing back or being adsorbed to the outlet 153 due to negative pressure. This ensures the unidirectionality of the filtration process and thus helps to improve the filtration effect of the filter 10.

[0032] Optionally, special structures, such as filter screens or microporous plates, can be added to the sealing end of the flow section 31 to further improve filtration accuracy. The outer periphery of the filter element 3 abuts against the cavity wall of the filter chamber 15, so that the filter element 3 almost fills the entire filter chamber, avoiding dead zones that may be formed in the impurity liquid during the filtration process. These areas are usually difficult to clean and may cause impurities to accumulate, which in turn helps to further improve the filtration effect.

[0033] Reference Figure 3 and Figure 4 In one embodiment of the present invention, a liquid-separating part 155 is also provided on one side of the cavity wall of the filter cavity 15 to form a buffer port 1553 with the other side of the cavity wall of the filter cavity 15. The liquid-separating part 155 is disposed between the filter element 3 and the outlet 153.

[0034] The liquid separator 155 can be integrally formed with the wall of the filter chamber 15.

[0035] In this embodiment, the inlet 151 and the outlet 153 are separated by the liquid separator 155. After the impurity liquid is introduced from the inlet 151, it is fully filtered and absorbed by the filter element 3 before flowing out through the buffer port 1553. This helps to ensure that the filter element 3 fully filters the impurity liquid, thereby improving the filtration effect of the filter 10.

[0036] Reference Figure 3 and Figure 4 In one embodiment of the present invention, a plurality of liquid-separating parts 155 are provided, and the plurality of liquid-separating parts 155 are spaced apart along a first direction. Adjacent liquid-separating parts 155 are respectively protruding along opposite sides of the wall of the filter chamber 15 to form a buffer channel 1551.

[0037] In this embodiment, by setting multiple liquid-separating parts 155 to form a labyrinth-shaped buffer channel 1551, the flow channel in the filter chamber 15 becomes narrower and longer, which can reduce the flow rate and further allow the filter element 3 sufficient time to absorb impurity liquid, thereby improving the filtration effect of the filter 10.

[0038] Reference Figures 2 to 4 In one embodiment of the present invention, the filter 10 further includes a filter membrane 5, which is sealed at the outlet 153.

[0039] In this embodiment, after the initial filtration by the filter element 3, the filter membrane 5 plays a secondary filtration role, which can further refine the filtration process, intercept smaller particles, and improve filtration accuracy. In addition, the filter membrane 5 is easily stained by colored liquids. This property can be used to detect whether the adsorption effect of the sponge in the filter 10 meets the usage requirements, thereby reminding the staff to replace the filter element 3 to ensure the normal filtration of the filter 10.

[0040] Reference Figures 2 to 4 In one embodiment of the present invention, two limiting portions 135 are protruding from the inner side of the cavity wall of the filter cavity 15. The two limiting portions 135 are arranged perpendicularly to the first direction and spaced apart to form a limiting groove 1351. The filter membrane 5 is inserted into the limiting groove 1351.

[0041] In this embodiment, the limiting groove 1351 is used to support and fix the filter membrane 5, thereby facilitating the installation of the filter membrane 5 in the filter chamber 15, enabling timely replacement of the filter membrane 5, and improving the overall operating efficiency of the treatment device.

[0042] Optionally, the wall of the filter chamber 14 is further provided with a support portion, which is located between the two limiting portions 135 and together with the two limiting portions 135 forms a mounting groove with three sides. The mounting groove is used to install the filter membrane 5. The filter membrane 5 is simultaneously attached to the two side walls and the bottom wall of the mounting groove. Compared with the filter membrane being attached to the two limiting portions on only two sides, this solution is beneficial to further increase the installation stability of the filter membrane 5.

[0043] Reference Figure 3 In one embodiment of the present invention, the outer diameter of the flow section 31 gradually expands along a direction perpendicular to the first direction. Both the flow section 31 and the storage section 33 are made of sponge.

[0044] In this embodiment, the gradually expanding outer diameter of the flow section 31 helps to reduce the liquid flow rate and the impact on the filter material, while increasing the filtration area, which is beneficial to ensuring the normal filtration of the filter 10.

[0045] Reference Figure 3 In one embodiment of the present invention, both the flow section 31 and the storage section 33 are made of sponge.

[0046] In this embodiment, sponge is used as the material for the flow section 31 and the storage section 33, which not only provides efficient filtration performance, but also has good water absorption and water retention capacity, and is easy to clean and replace.

[0047] Reference Figure 3 In one embodiment of the present invention, the inlet 151 and the outlet 153 are offset perpendicular to the first direction.

[0048] In this embodiment, the staggered arrangement of the inlet 151 and the outlet 153 can guide the liquid to form a specific flow path in the filter chamber 15, which helps the liquid to contact the filter material more fully, thereby improving the filtration efficiency.

[0049] Reference Figure 4 and Figure 5 In one embodiment of the present invention, the housing assembly 1 includes a first housing 11 and a second housing 13. The first housing 11 has a first mounting surface 111 and the second housing 13 has a second mounting surface 131. One of the first mounting surface 111 and the second mounting surface 131 is provided with a welding station 1311 and the other is provided with a weld seam 1111. The welding station 1311 is welded to the weld seam 1111 so that the first housing 11 and the second housing 13 surround each other to form the filter cavity 15.

[0050] In this embodiment, the first housing 11 and the second housing 13 are connected using ultrasonic welding technology, which does not damage the structure of the first assembly surface 111 and the second assembly surface 131, and provides good sealing performance, which helps to prevent liquid leakage. In addition, the welding station 1311 and the weld seam 1111 can also play a role in assembly positioning, thereby improving the assembly accuracy of the first housing 11 and the second housing 13.

[0051] Reference Figure 4 and Figure 5 In one embodiment of the present invention, one of the first mounting surface 111 and the second mounting surface 131 is provided with a sealing groove 1313, and the other is provided with a snap-fit ​​part 1113. The snap-fit ​​part 1113 is inserted into and limited in the sealing groove 1313, and a sealing element is filled between the snap-fit ​​part 1113 and the groove wall of the sealing groove 1313.

[0052] In this embodiment, since the filter 10 has high sealing requirements, by initially snapping the snap-fit ​​part 1113 into the sealing groove 1313 and filling the groove wall of the sealing groove 1313 with a sealing element such as a sealing ring, the tightness of the assembly between the first assembly surface 111 and the second assembly surface 131 can be further guaranteed, thereby improving the sealing performance of the filter 10.

[0053] Reference Figure 4 and Figure 5 In one embodiment of the present invention, a positioning part 113 is provided on the inner wall surface of one of the first housing 11 and the second housing 13. The end of the positioning part 113 is provided with a mounting hole 1131, and the other part is provided with a connecting hole 133. A fastener is sequentially inserted through the connecting hole 133 and the mounting hole 1131 to thread the first housing 11 and the second housing 13.

[0054] In this embodiment, the first housing 11 and the second housing 13 are simply welded together, which may result in insufficient connection strength. This solution uses fasteners to securely connect the first housing 11 and the second housing 13, thereby ensuring the stability of the connection. Furthermore, the positioning part 113 is located on the inner wall of the housing, and a mounting hole 1131 is provided in the positioning part 113, which helps to avoid the defect of reduced sealing caused by opening holes on the outer wall of the housing.

[0055] Optionally, a notch 331 is provided at the end of the filter element 3 to avoid the positioning part 331, so as to ensure that the filter element 3 and the positioning part 331 are precisely aligned, which simplifies the installation process and facilitates the replacement of the filter element 3. At the same time, it reduces the displacement of the filter element 3 caused by vibration or fluid impact, which in turn helps to further ensure the filtration effect.

[0056] The present invention also proposes a therapeutic device, which includes a treatment head, a handheld component, a negative pressure generating component, and a filter 10 as described above. The treatment head is used to apply negative pressure to the treatment area; the inlet 151 is connected to the side of the treatment head away from the treatment area; one side of the handheld component is connected to the outlet 153; and the negative pressure generating component is connected to the other side of the handheld component. The specific structure of the filter 10 is as described in the above embodiments. Since this therapeutic device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated here.

[0057] The treatment head may have microneedle electrodes, which can penetrate the skin surface and open skin channels, making it easier for drugs or active ingredients to penetrate into the deeper layers of the skin and improving the bioavailability of the drugs.

[0058] Handheld devices are designed for hand operation and are typically ergonomically designed to ensure comfort during extended use and reduce hand fatigue. They may integrate control buttons, switches, or adjustment knobs, allowing users to adjust device settings such as negative pressure intensity, temperature, or vibration frequency during treatment.

[0059] The negative pressure generating component can be a negative pressure pump or other components, used to generate negative pressure excitation in the cavity formed by the treatment head and the handheld part, so that the microneedle electrode of the treatment head can be closely attached to the skin area of ​​the human body, thereby further ensuring the treatment effect of the device.

[0060] In the therapeutic device of this invention, the filter 10 is connected to the treatment head via a first tube 115 and to the handheld component via a second tube 116, thus achieving assembly between the treatment head and the handheld component. It is worth noting that the flow length of the first tube 115 connecting the treatment head and the filter 10 is relatively short. Therefore, when the therapeutic device is working, impurity liquid can enter the filter 10 in a short time, and less impurity liquid remains in the first tube 115, thereby preventing backflow of liquid after the therapeutic device stops working.

[0061] In summary, the filter 10 and the treatment device of this embodiment of the invention are designed so that the filter 10, after assembly, can be fitted between the treatment head and the handheld component. It is used in conjunction with the treatment head and can also be replaced independently if the filter 10 malfunctions. In actual use, the operator first holds the handheld component of the treatment device to position the treatment head towards the skin area along a first direction, which is the direction of gravity. The inlet 151 side of the filter 10 connects downwards along the direction of gravity to the treatment head.

[0062] Next, during the treatment of human skin, the negative pressure generating component in the treatment device is activated and generates suction, adsorbing the skin onto the microneedle electrodes of the treatment head. At this time, the impurity liquid on the skin surface flows along the first tube 115 under the action of suction and quickly flows through the inlet 151 into the filter chamber 15 of the filter 10. Then, when the impurity liquid flows to the filter 10, it will first pass through the sponge filter element 3. Because the sponge has good adsorption properties, it can fully absorb the impurity liquid, and under the action of suction, the impurity liquid absorbed by the sponge will slowly move along the extension direction of the flow section 31.

[0063] It is worth noting that, since the inlet 151 of the filter 10 is positioned downwards along the direction of gravity, when the negative pressure generating component is turned off and the suction disappears, the impurity liquid will slowly move vertically downwards to the sponge's storage section 33 under the influence of gravity, until the negative pressure generating component is activated in the next stage. This structural design divides the sponge into a flow section 31 and a storage section 33, improving the sponge's capacity to hold an appropriate amount of liquid while maintaining a stable filtration effect. A filter membrane 5 is installed at the outlet 153 of the filter 10, which can serve as a secondary filtration unit and prevent insufficient absorption of impurity liquid by the sponge due to excessively fast flow rates, thus making the filtration effect of the component more stable. In addition, the filter membrane 5 is easily stained by colored liquids; this property can be used to design tests to check whether the adsorption effect of the sponge in the filter 10 meets the usage requirements.

[0064] Correspondingly, the filter 10 and the treatment device of the present invention have the following beneficial effects: the filter 10 is located between the treatment head and the grip, and the short flow channel effectively reduces liquid backflow; the filter 10 is equipped with an absorbent sponge as a filter element 3, and the sponge plays a filtering and containing role due to its good adsorption properties; the filter 10 is equipped with a microporous filter membrane 5, which plays a role in secondary filtration and detecting the effect of sponge use; the filter 10 can be assembled and replaced synchronously or independently with the treatment head, which provides higher safety and flexibility.

[0065] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A filter, characterized in that, The filter is used in the therapeutic device, and the filter comprises: A housing assembly, the housing assembly having a filter chamber, the filter chamber having an inlet and an outlet respectively extending through its wall along a first direction, the inlet being located below the outlet along the first direction; and A filter element comprising a connected flow section and a storage section, the flow section being disposed between the inlet and the outlet and extending along a side perpendicular to a first direction, and the storage section protruding from the flow section on the side opposite to the outlet. The first direction is the direction of gravity when the filter is in use. Air and impurity liquid are introduced from the inlet, and then flow along the flow section, after which the impurity liquid settles in the storage section.

2. The filter as claimed in claim 1, characterized in that, One end of the flow section is blocked at the inlet.

3. The filter as described in claim 1, characterized in that, The filter chamber has a liquid-separating part protruding on one side of its cavity wall to form a buffer opening with the other side of the filter chamber wall. The liquid-separating part is located between the filter element and the outlet.

4. The filter as described in claim 3, characterized in that, The liquid-separating parts are provided in multiples, and the multiple liquid-separating parts are spaced apart along the first direction. The adjacent two liquid-separating parts are respectively protruded along the opposite sides of the filter cavity wall to form a buffer channel.

5. The filter as described in any one of claims 1 to 4, characterized in that, The filter also includes a filter membrane that seals the outlet.

6. The filter as claimed in claim 5, characterized in that, The inner wall of the filter chamber is provided with two limiting parts, which are arranged perpendicularly to the first direction and spaced apart to form a limiting groove. The filter membrane is inserted into the limiting groove.

7. The filter as claimed in any one of claims 1 to 4, characterized in that, The outer diameter of the flow section gradually expands in a direction perpendicular to the first direction.

8. The filter as claimed in any one of claims 1 to 4, characterized in that, The housing assembly includes a first housing and a second housing. The first housing has a first mounting surface, and the second housing has a second mounting surface. One of the first mounting surface and the second mounting surface has a protruding welding station, and the other has a recessed weld seam. The welding station is welded to the weld seam so that the first housing and the second housing enclose the filter cavity.

9. The filter as claimed in claim 8, characterized in that, One of the first mounting surface and the second mounting surface is recessed with a sealing groove, and the other is protruding with a snap-fit ​​part. The snap-fit ​​part is inserted into and limited in the sealing groove, and a sealant is filled between the snap-fit ​​part and the groove wall of the sealing groove.

10. The filter as claimed in claim 1, characterized in that, The filter element is made of a hydrophilic material.

11. A therapeutic device, characterized in that, The therapeutic device includes: A treatment head, used to apply negative pressure adsorption to the treatment area; The filter as claimed in any one of claims 1 to 10, wherein the inlet is connected to the side of the treatment head opposite to the treatment area; A handheld component, one side of which is connected to the outlet; as well as A negative pressure generating component, which is connected to the other side of the handheld device.

Images