Negative pressure channel filter, treatment head, and treatment handle

Abstract

The utility model discloses a kind of negative pressure channel filter, treatment head and treatment handle, it is related to negative pressure equipment technical field, wherein, the negative pressure channel filter has filter cavity, air inlet and air outlet, the air inlet and the air outlet are communicated with the filter cavity respectively;And the air inlet is provided with check valve and reset piece, the reset piece is connected with the check valve;The negative pressure channel filter is in negative pressure opening, and negative pressure drives check valve away from air inlet;The reset piece is used to drive the check valve to be close to the air inlet when the negative pressure channel filter is in negative pressure closing;The technical scheme provided by the utility model prevents liquid from backflowing from air inlet in non-negative pressure state, and improves the reliability of negative pressure channel filter in clinical application process.

Description

Technical Field

[0001] This utility model relates to the field of negative pressure equipment technology, and in particular to a negative pressure channel filter, a treatment head, and a treatment handle. Background Technology

[0002] In some clinical settings, the treatment head is placed against the skin. Negative pressure is used to hold the skin in place before the head injects medication or other substances onto or into the skin. During this process, the negative pressure continuously adheres to the skin, attracting medication, hair, and other impurities into the treatment head. Therefore, a filter is typically installed inside the treatment head to remove these contaminants and prevent them from entering the negative pressure system.

[0003] However, if the negative pressure stops abruptly during treatment, the one-way valve inside the filter may not respond in time, causing impurities inside the filter to flow back onto the skin due to gravity, affecting the normal use of the treatment head. Utility Model Content

[0004] The main purpose of this invention is to provide a negative pressure channel filter, treatment head, and treatment handle, which aims to prevent liquid from flowing back from the air inlet under non-negative pressure conditions and improve the reliability of the negative pressure channel filter in clinical applications.

[0005] To achieve the above objectives, this utility model proposes a negative pressure channel filter, which has a filter chamber, an air inlet, and an air outlet, wherein the air inlet and the air outlet are respectively connected to the filter chamber; and the air inlet is provided with a one-way valve and a reset member, wherein the reset member is connected to the one-way valve.

[0006] When the negative pressure channel filter is in negative pressure open, the negative pressure drives the one-way valve away from the air inlet; when the negative pressure channel filter is in negative pressure closed, the reset member is used to drive the one-way valve closer to the air inlet.

[0007] In one embodiment, the reset member is an elastic arm, which includes a deformable segment and a fixed portion connected to the deformable segment, and the end of the deformable segment away from the fixed portion is connected to the one-way valve.

[0008] In one embodiment, the fixing part is disposed on the inner wall of the air inlet or on the cavity wall of the filter cavity.

[0009] In one embodiment, the one-way valve includes a diaphragm for covering the air inlet when closed under negative pressure.

[0010] In one embodiment, the edge of the diaphragm is provided with a flange, and the flange is disposed in accordance with the air inlet and elastically abuts against the edge of the air inlet.

[0011] In one embodiment, the filter chamber is provided with an anti-backflow channel, the two ends of which are respectively connected to the air inlet and the air outlet. The anti-backflow channel is used to prevent backflow liquid from returning to the air inlet.

[0012] In one embodiment, the wall of the filter chamber is provided with baffles, and the baffles and the wall of the filter chamber enclose the anti-backflow channel.

[0013] In one embodiment, the cross-sectional shape of the anti-backflow channel is helical.

[0014] In one embodiment, the air inlet is higher than the bottom wall of the anti-backflow channel.

[0015] In one embodiment, the negative pressure channel filter is further provided with a liquid storage chamber, which is connected to the end of the anti-backflow channel away from the air inlet and the air outlet.

[0016] In one embodiment, at least one of the anti-backflow channel and the liquid storage chamber is provided with an absorbent sponge, which is used to absorb backflow liquid.

[0017] In one embodiment, a waterproof and breathable membrane is provided at the air outlet.

[0018] This utility model also proposes a treatment head, the treatment head comprising:

[0019] A housing having an inner cavity and a treatment opening, the treatment opening communicating with the inner cavity;

[0020] Negative pressure assembly, wherein the negative pressure assembly is installed at the treatment opening; and

[0021] The negative pressure channel filter described above is installed in the inner cavity and communicates with the negative pressure assembly.

[0022] This utility model also proposes a treatment handle, including a handheld component and the aforementioned treatment head, wherein the treatment head and the handheld component are detachably connected.

[0023] The negative pressure channel filter of this utility model has a filter chamber, an air inlet, and an air outlet, with the air inlet and outlet respectively connected to the filter chamber. The air inlet is equipped with a one-way valve and a reset element, with the reset element connected to the one-way valve. When the negative pressure channel filter is in negative pressure operation, the negative pressure drives the one-way valve away from the air inlet. When the negative pressure channel filter is in negative pressure operation, the reset element drives the one-way valve closer to the air inlet. In other words, by setting a reset element connected to the one-way valve at the air inlet, the one-way valve is opened during operation using negative pressure. After the negative pressure is closed, the reset element promptly drives the one-way valve to approach the air inlet in a non-negative pressure state to seal the air inlet, ensuring that liquid does not flow back from the air inlet when the negative pressure is interrupted, thereby significantly improving the reliability of the negative pressure channel filter in clinical applications. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0025] Figure 1 A schematic diagram of the structure of an embodiment of the negative pressure channel filter provided by this utility model;

[0026] Figure 2 for Figure 1 Sectional view of section AA in the middle;

[0027] Figure 3 for Figure 1 BB section cross-section view;

[0028] Figure 4 A schematic diagram of the air inlet of the negative pressure channel filter provided by this utility model;

[0029] Figure 5 An exploded view of the negative pressure channel filter provided by this utility model;

[0030] Figure 6 This is a schematic diagram of the assembly of the negative pressure channel filter and the housing provided by this utility model.

[0031] Explanation of icon numbers:

[0032] 10. Negative pressure channel filter; 10a. Filter chamber; 10b. Air inlet; 10c. Air outlet; 10d. Anti-backflow channel; 10e. Liquid storage chamber; 20. One-way valve; 21. Connector; 22. Diaphragm; 30. Reset component; 31. Deformation section; 32. Fixing part; 40. Rib; 50. Waterproof and breathable membrane; 60. Absorbent sponge.

[0033] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0035] It should be noted that if the embodiments of this utility model 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.

[0036] Furthermore, if the embodiments of this utility model 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. Therefore, 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 utility model.

[0037] In existing technologies, when a medical treatment head uses negative pressure to adhere to the skin and inject medication, impurities inside the filter can easily flow back to the skin surface when the negative pressure suddenly stops. Traditional filters rely on a one-way valve that passively closes, but the inertia of the liquid under gravity can cause the valve to lag in its reset, creating a temporary backflow channel. Even in some skin repair treatments, a sudden power outage of the treatment head can cause the negative pressure to disappear, allowing the anesthetic medication in the filter chamber to flow back into the patient's wound, posing a risk of local infection.

[0038] To address these issues, designers discovered that the reset speed of the check valve directly affects the backflow control effect. Traditional spring reset mechanisms, when installed vertically, are affected by fluid resistance, resulting in a delay in valve body movement. Through analysis of the fluid dynamics model, it was found that dynamically linking the elastic reset mechanism with the valve body can shorten the response time. Further research into the diaphragm seal morphology led to a proposal to enhance the closure effect by utilizing elastic deformation to generate preload.

[0039] Therefore, please refer to Figures 1 to 3 and Figure 5 This application proposes a negative pressure channel filter 10, which has a filter chamber 10a, an air inlet 10b, and an air outlet 10c. The air inlet 10b and the air outlet 10c are respectively connected to the filter chamber 10a. The air inlet 10b is provided with a one-way valve 20 and a reset member 30, and the reset member 30 is connected to the one-way valve 20. When the negative pressure is turned on, the negative pressure drives the one-way valve 20 away from the air inlet 10. When the negative pressure is turned off, the reset member 30 drives the one-way valve 20 closer to the air inlet 10b.

[0040] In this embodiment, the filter chamber 10a refers to a sealed space that contains impurities and performs gas-liquid separation. It can be implemented using a multi-chamber structure, with the chamber shape designed to be wider at the top and narrower at the bottom to slow down the liquid flow rate. The air inlet 10b refers to the gas inlet channel connecting to an external negative pressure source. The air outlet 10c refers to the gas outlet connecting the filter chamber 10a to the inner cavity of the treatment head. The one-way valve 20 refers to an opening and closing mechanism that controls the unidirectional flow of gas. The reset member 30 refers to a drive assembly that provides elastic restoring force.

[0041] Specifically, when the negative pressure system is activated, a negative pressure difference is created at the inlet 10b, driving the one-way valve 20 away from the inlet 10b. Simultaneously, the reset element 30 undergoes elastic deformation to store mechanical energy. At this time, the filter chamber 10a draws in gas containing impurities through the open inlet 10b, and after sedimentation and separation within the chamber, clean gas is discharged from the outlet 10c. When the negative pressure is suddenly interrupted, the reset element 30 releases its stored elastic potential energy, pushing the one-way valve 20 to quickly contact the inlet 10b to form a mechanical seal. This dynamic closing process is completed within a preset time, effectively blocking the liquid backflow path. The annular flange at the edge of the diaphragm 22 forms a surface contact seal with the inlet 10b when closed, and the radial compressive stress generated by the elastic material enhances the reliability of the seal.

[0042] Compared to existing technologies, traditional filters employ a gravity-fed valve plate structure, which is prone to sealing failure under tilted conditions. This solution addresses this by installing a reset element 30 connected to a one-way valve 20 at the air inlet 10b. The reset element 30 promptly activates the one-way valve 20 to seal the air inlet 10b under non-negative pressure conditions, preventing liquid backflow from the air inlet 10b in abnormal operating conditions such as negative pressure interruption or equipment tilt. This significantly improves the reliability of the negative pressure channel filter 10 in clinical applications.

[0043] Please see Figures 1 to 3 and Figure 5 This application further proposes that the reset member 30 is an elastic arm, which includes a deformable section 31 and a fixed part 32 connected to the deformable section 31. The end of the deformable section 31 away from the fixed part 32 is connected to the one-way valve 20.

[0044] In this embodiment, the elastic arm refers to a strip-shaped structure with elastic deformation capability, and the deformation segment 31 refers to the part of the elastic arm that can undergo elastic deformation, capable of bending or torsional deformation under stress. Specifically, it can be implemented using a thin-walled bending structure or a spiral structure, with its length and cross-sectional shape adjustable for the amount of elastic deformation. The deformation segment 31 can be made of shape memory alloy (such as nickel-titanium alloy) or a superelastic polymer, which can return to its initial state after repeated deformation, extending its service life. The fixing part 32 refers to the connection area used to install and position the deformation segment 31, which can be achieved through snap-fit ​​or adhesive fixing, providing a stable support foundation.

[0045] When the internal pressure of the negative pressure channel filter 10 changes, the deformation section 31 undergoes elastic bending under the displacement of the one-way valve 20, storing elastic potential energy to cause the one-way valve 20 to move in accordance with the pressure change. When the negative pressure disappears, the deformation section 31 releases the stored elastic potential energy, driving the one-way valve 20 to reset to the closed position. The fixing part 32 serves as the support end of the deformation section 31, limiting its displacement direction and ensuring the directional transmission of the elastic restoring force. The geometric dimensions of the deformation section 31 can be adjusted according to the required reset force; for example, increasing the length can reduce the elastic stiffness, and increasing the bending amplitude of the deformation section 31 can extend the reset stroke.

[0046] This application enables precise control of the opening and closing position of the check valve 20, ensuring that the deformation section 31 responds quickly and drives the check valve 20 to reset when the negative pressure changes abruptly, effectively blocking the backflow path of impurities. The mounting method of the fixed part 32 of the elastic arm enhances structural stability, prevents reset deviation caused by vibration or impact, and improves the operational reliability of the filter.

[0047] Optionally, the elastic arm integrates the deformation section 31 and the fixed part 32 through an integral structure. While simplifying the assembly, the linear reset movement of the one-way valve 20 is achieved through the directional deformation characteristics of the deformation section 31, avoiding the risk of sealing failure caused by multi-degree-of-freedom movement.

[0048] In other embodiments, a magnet can be used instead of an elastic arm, and the one-way valve 20 contains ferromagnetic material. When the negative pressure disappears, the magnetic force pulls the valve plate to close (to avoid mechanical fatigue).

[0049] Please see Figure 2 , Figure 4 and Figure 5 This application further proposes that the fixing part 32 is provided on the inner wall of the air inlet 10b or on the cavity wall of the filter cavity 10a.

[0050] In one embodiment, reference is made to Figure 4 When the fixing part 32 is installed on the inner wall of the air inlet 10b, the deformation section 31 of the elastic arm extends directly into the interior of the air inlet 10b, so that the one-way valve 20 can quickly open or close in the air intake direction when the negative pressure changes, reducing the energy loss caused by the bending of the elastic arm and improving the reset efficiency.

[0051] In another embodiment, please refer to Figure 1 and Figure 2 The cavity wall of the filter chamber 10a refers to the structural surface inside the filter chamber 10a. Specifically, the mounting position of the fixing part 32 can be formed by an integrally molded protrusion or an independently installed bracket, and the force on the reset member 30 is distributed by the cavity structure. When the fixing part 32 is set on the cavity wall of the filter chamber 10a, the deformation section 31 of the elastic arm spans the internal space of the filter chamber 10a. The support stability of the cavity wall is used to avoid external vibration interference, ensuring that the one-way valve 20 can still accurately reset under complex working conditions.

[0052] Compared to existing technologies, the reset component 30 in existing technologies typically uses an independent bracket or an external fixing structure, which is prone to misalignment of the fixing end due to assembly gaps or material fatigue, leading to a delay or jamming in the reset of the one-way valve 20. This solution, however, directly integrates the fixing part 32 into the inner wall of the air inlet 10b or the wall of the filter chamber 10a, fully utilizing the filter's own structure to achieve rigid fixation of the reset component 30, reducing assembly complexity and minimizing relative displacement between moving parts. Both of these fixing methods optimize the installation position of the reset component 30, avoiding the loose connection between the fixing end and moving parts in traditional structures, thereby improving the response speed and reset accuracy of the one-way valve 20.

[0053] Optionally, the fixing part 32 is connected to the cavity wall by a snap-fit ​​connection, which facilitates disassembly, cleaning, or replacement of the elastic arm. A damping rubber ring is added to the fixing part 32 to reduce valve vibration caused by the movement of the treatment head.

[0054] Please see Figure 1 and Figure 4 This application further proposes a one-way valve 20 including a diaphragm 22, which is used to cover the air inlet 10b when closed under negative pressure.

[0055] In this embodiment, the diaphragm 22 refers to a flexible or semi-flexible sealing component covering the air inlet 10b. Specifically, it can be implemented using silicone or rubber sheets, deforming to fit the edge of the air inlet 10b to block airflow and impurities. A hydrophobic material (such as polytetrafluoroethylene) is coated on the side of the diaphragm 22 that contacts the liquid to reduce the adhesion of residual droplets. Specifically, when the negative pressure is activated, the diaphragm is adsorbed, causing it to detach from the edge of the air inlet 10b. At this time, airflow enters the filter chamber 10a, and the diaphragm 22 simultaneously drives the reset member 30 to move. When the negative pressure is deactivated, the reset member 30 pulls the diaphragm 22 to cover the air inlet 10b, forming a tight fit with the air inlet 10b through edge deformation caused by the flexible material. The rigid connection between the connector 21 and the reset member 30 eliminates energy loss during the action transmission process, and the planar covering shape of the diaphragm 22 shortens the travel distance of the sealing action.

[0056] In one embodiment, the one-way valve 20 includes a diaphragm 22 and a connector 21, with the two ends of the connector 21 connected to the diaphragm 22 and the reset member 30, respectively. The connector 21 is a rigid or semi-rigid structure used to transmit the force of the reset member 30, specifically a metal rod or a plastic connecting rod, used to transmit the displacement generated by elastic reset to the diaphragm 22. By decomposing the one-way valve 20 into a combined structure of the connector 21 and the diaphragm 22, the rigid transmission shortens the action response time. The deformation compensation capability of the diaphragm 22 allows the sealing surface to remain effectively closed even when impurities remain, thereby realizing the instantaneous opening and closing action of the one-way valve 20 when switching between negative pressure states. The rapid contact between the diaphragm 22 and the air inlet 10b effectively prevents the liquid and impurities in the filter chamber 10a from flowing backward under the action of gravity. The rigid transmission characteristics of the connector 21 ensure that the force of the reset member 30 is completely transmitted to the sealing interface, solving the backflow contamination problem caused by the valve body response delay.

[0057] Please see Figure 1 and Figure 4 This application further proposes that the edge of the diaphragm 22 is provided with a flange, and the flange is provided to fit the air inlet 10b and elastically abut against the edge of the air inlet 10b.

[0058] In this embodiment, the flange refers to the annular extension structure formed along the outer edge of the diaphragm 22. Specifically, it can be made of flexible material through integral molding, with its outer diameter slightly larger than the inner diameter of the air inlet 10b to achieve an interference fit. This structure covers the edge of the air inlet 10b with a circumferentially continuous annular contact surface, forming a sealing barrier when the negative pressure disappears. Elastic contact refers to the deformation and reverse force generated when the flange contacts the edge of the air inlet 10b. Specifically, the diaphragm 22 can be made of silicone rubber or polyurethane material, utilizing the material's own elasticity to maintain contact pressure. Furthermore, multiple concentrically arranged flanges are added to the edge of the diaphragm 22, forming multiple sealing lines to improve airtightness. The flange adopts a hollow structure (such as an embedded O-ring) to reduce compressive stress and extend elastic life.

[0059] When negative pressure is applied, the diaphragm 22, driven by airflow, causes the flange to detach from the edge of the inlet 10b, forming a gas flow channel. The instant the negative pressure disappears, the restoring force generated by the elastic material causes the flange to quickly return to its original position. Its circumferentially continuous structure ensures that the sealing surface completely covers the edge area of ​​the inlet 10b. The pre-tightening force generated by the elastic contact overcomes the effect of liquid gravity, keeping the sealing interface closed even without external pressure. The flange structure at the edge of the diaphragm 22 compensates for machining errors in the inlet 10b through deformation, maintaining sealing reliability during multiple opening and closing cycles. This solution automatically adjusts the contact pressure distribution under dynamic operating conditions through the elastic deformation characteristics of the flange, eliminating the risk of local leakage caused by structural deformation or assembly errors. In other embodiments, the one-way valve 20 can also be made of diaphragm 20.

[0060] Please see Figure 1 and Figure 5 This application further proposes to provide an anti-backflow channel 10d in the filter chamber 10a. The two ends of the anti-backflow channel 10d are connected to the air inlet 10b and the air outlet 10c, respectively. The anti-backflow channel 10d is used to prevent backflow liquid from returning to the air inlet 10b.

[0061] In this embodiment, the anti-backflow channel 10d refers to the liquid flow path located inside the filter chamber 10a and connecting the air inlet 10b and the air outlet 10c. This anti-backflow channel 10d forms a physical barrier by changing the direction of liquid flow. Specifically, preventing backflow liquid from returning to the air inlet 10b means extending the liquid flow path or forming a barrier layer through the specific shape of the anti-backflow channel 10d, such as using a spiral cross-section or setting multiple deflection sections, thereby increasing the resistance to liquid backflow.

[0062] When the negative pressure suddenly stops, the liquid may flow back towards the air inlet 10b under the influence of gravity. At this time, the anti-backflow channel 10d forces the liquid to flow along a preset path. Through the physical blocking structure of the anti-backflow channel 10d, even with a brief delay, the liquid is still confined within the channel and cannot return to the air inlet 10b, thus compensating for the lack of dynamic response of the one-way valve 20. The inner wall of the anti-backflow channel 10d has laser-etched micron-level grooves, utilizing capillary action to impede liquid backflow. The anti-backflow channel 10d also contains a temperature-sensitive gel that expands and blocks the channel at low temperatures (such as when treatment stops).

[0063] Please see Figure 1 and Figure 5 This application further proposes to provide baffles 40 on the wall of the filter chamber 10a, and the baffles 40 and the wall of the filter chamber 10a enclose the anti-backflow channel 10d.

[0064] The baffle 40 refers to a protruding structure extending outward from the surface of the filter chamber 10a wall. Specifically, it can be implemented using continuous or intermittent protrusions in the form of strips, arcs, or waves. A superhydrophobic coating is sprayed onto the surface of the baffle 40 to guide the liquid towards the storage chamber 10e. The baffle 40 forces the liquid to change its flow direction by increasing the physical obstruction area in the liquid backflow path. The anti-backflow channel 10d refers to the space defined by the baffle 40 and the filter chamber 10a wall. Specifically, it can be implemented using a single layer or multiple layers of baffle 40 arranged in parallel, forming a curved, zigzag, or spiral path with the chamber wall. The anti-backflow channel 10d limits the direct return of liquid to the air inlet 10b by extending the liquid backflow path and increasing flow resistance.

[0065] The baffle 40 is fixed to the wall of the filter chamber 10a, and its extension direction forms an angle with the counter-flow direction of the liquid. When the liquid moves towards the air inlet 10b due to gravity, the channel formed by the baffle 40 and the chamber wall forces the liquid to flow along a predetermined path, for example, by creating multiple directional changes within the channel. The cross-sectional area of ​​the channel is controlled to be less than the minimum space required for free liquid flow, thereby generating flow resistance. As the liquid flows within the channel, its kinetic energy is gradually consumed due to the increased path length and change in direction, eventually preventing it from reaching the air inlet 10b.

[0066] This design incorporates a baffle 40 in the liquid return path to form an anti-backflow channel 10d. This ensures that even if the liquid breaches the one-way valve 20, it must overcome complex path resistance to flow back to the air inlet 10b, increasing flow resistance and preventing direct return to the air inlet 10b area. The physical barrier and path constraint created by the baffle 40 cause the liquid to be repeatedly blocked and retained during the backflow process, ultimately accumulating at the bottom of the filter chamber 10a or flowing into the storage chamber 10e, thus preventing contamination of the treatment area.

[0067] Please see Figure 1 and Figure 5This application further proposes that the anti-backflow channel 10d has a spiral cross-sectional shape. The spiral cross-section refers to a channel whose flow path is a continuously curved spiral structure along the axial direction. Specifically, this can be achieved by setting a curved flow path around the central axis inside the filter chamber 10a, formed by injection molding or 3D printing. This structure increases the liquid flow resistance by changing the direction and path distribution of the liquid flow. Compared to a straight or single curved flow path, the spiral cross-section avoids turbulent backflow caused by sudden liquid changes, and at the same time, the three-dimensional spiral structure achieves a more uniform flow resistance distribution within a limited space, further enhancing the resistance effect against backflowing liquid.

[0068] The spiral cross-section of the anti-backflow channel 10d in this design, through a continuously curved flow channel design, gradually slows down the liquid during flow, avoiding insufficient energy loss caused by sudden changes in direction, thus more efficiently suppressing liquid backflow. The anti-backflow channel 10d has a large inlet diameter and a small outlet diameter, accelerating airflow and enhancing liquid separation.

[0069] Please see Figure 1 , Figure 2 , Figure 3 and Figure 5 This application further proposes a technical solution in which the air inlet 10b is higher than the bottom wall of the anti-backflow channel 10d and / or the air outlet 10c is higher than the bottom wall of the anti-backflow channel 10d.

[0070] The fact that the air inlet 10b is higher than the bottom wall of the anti-backflow channel 10d means that there is a vertical height difference between the lowest point of the air inlet 10b opening and the bottom wall of the anti-backflow channel 10d. This can be achieved by placing the air inlet 10b in the upper region of the side wall of the anti-backflow channel 10d. This design ensures that when liquid accumulates in the anti-backflow channel 10d, the liquid level will not reach the lowest point of the air inlet 10b opening. Similarly, the fact that the air outlet 10c is higher than the bottom wall of the anti-backflow channel 10d means that there is a vertical height difference between the lowest point of the air outlet 10c opening and the bottom wall of the anti-backflow channel 10d. This can be achieved by placing the air outlet 10c in the upper region of the side wall of the anti-backflow channel 10d or by extending it independently to a higher position. This design also ensures that when liquid accumulates in the anti-backflow channel 10d, the liquid level will not reach the lowest point of the air outlet 10c opening.

[0071] Specifically, when the treatment is interrupted and the negative pressure disappears, the liquid in the anti-backflow channel 10d accumulates on the bottom wall due to gravity. Since the lowest point of the air inlet 10b is higher than the bottom wall of the channel, the liquid cannot flow back out through the air inlet 10b to the outside of the treatment head. Similarly, when the lowest point of the air outlet 10c is higher than the bottom wall of the channel, the liquid cannot flow back into the negative pressure assembly through the air outlet 10c. Through this spatial arrangement, the liquid is confined to the bottom area of ​​the anti-backflow channel 10d, thus preventing contamination of the treatment area or the inside of the equipment. In this way, this solution forms a liquid level barrier by optimizing the opening position, achieving physical isolation without the need for complex sealing structures, avoiding the risk of contamination of the treatment area and damage to the negative pressure assembly, and ensuring the hygiene and safety of the treatment process.

[0072] Please see Figure 3 and Figure 5 This application further proposes that a waterproof and breathable membrane 50 be provided at the air outlet 10c.

[0073] In this embodiment, the waterproof and breathable membrane 50 refers to a thin film with a microporous structure made of polymer materials, specifically polytetrafluoroethylene or polyurethane. Its micropore diameter is between that of gas molecules and liquid molecules, allowing only gas to pass through while blocking liquids and solid particles. In the negative pressure open state, gas flows through the micropores; when the negative pressure is closed, the microporous structure forms a physical barrier, preventing liquid backflow.

[0074] When the negative pressure is activated, gas enters the filter chamber 10a from the inlet 10b and flows to the outlet 10c via the anti-backflow channel 10d. The micropores of the waterproof and breathable membrane 50 allow gas to pass through and maintain the normal operation of the negative pressure system. When the negative pressure suddenly stops, the liquid remaining in the filter chamber 10a flows towards the outlet 10c due to gravity. At this time, the waterproof and breathable membrane 50 forms a barrier layer based on its own hydrophobicity and microporous structure, preventing the liquid from penetrating the membrane layer and thus avoiding backflow to the outside. This membrane layer achieves gas-liquid separation through physical barrier action, without relying on the opening and closing of mechanical valves.

[0075] Therefore, this solution forms a passive barrier by using a fixed waterproof and breathable membrane 50, which eliminates the response time limitation of mechanical moving parts and avoids the risk of leakage caused by poor sealing of the one-way valve 20.

[0076] Please see Figure 3 and Figure 5 This application further proposes that the negative pressure channel filter 10 is also provided with a liquid storage chamber 10e, which is connected to the end of the anti-backflow channel 10d away from the air inlet 10b and the air outlet 10c.

[0077] The liquid storage chamber 10e is connected to the end of the anti-backflow channel 10d away from the air inlet 10b and the air outlet 10c. This design allows the liquid storage chamber 10e to act as a buffer and collect liquid in case of backflow during the operation of the negative pressure channel filter 10.

[0078] Specifically, when liquid attempts to flow back from the anti-backflow channel 10d to the air inlet 10b under negative pressure, the presence of the liquid reservoir 10e can accommodate some of the liquid, reducing the possibility of liquid entering the air inlet 10b. This further enhances the function of the negative pressure channel filter 10 in preventing liquid backflow and protects upstream equipment or systems connected to the air inlet 10b from damage caused by liquid backflow. The volume of the liquid reservoir 10e is designed to accommodate all the liquid that may flow back during a single treatment.

[0079] Please see Figure 3 and Figure 5 This application further proposes that at least one of the backflow prevention channel 10d and the liquid storage chamber 10e is provided with an absorbent sponge 60, which is used to absorb backflow liquid.

[0080] In one embodiment, an absorbent sponge 60 is provided in either the anti-backflow channel 10d or the liquid storage chamber 10e. In other embodiments, absorbent sponges 60 are provided in both the anti-backflow channel 10d and the liquid storage chamber 10e. The absorbent sponge 60 is a material with excellent water absorption properties, capable of effectively absorbing and storing liquid. During the operation of the negative pressure channel filter 10, when liquid attempts to flow back, the absorbent sponge 60 can quickly absorb the backflowing liquid and store it in its own porous structure, thereby further blocking the path of liquid backflow and improving the anti-backflow effect.

[0081] In addition, the presence of the absorbent sponge 60 can also adsorb moisture in the gas, further purifying the gas and ensuring that the gas discharged from the outlet 10c has a lower moisture content, thereby improving the overall filtration performance and reliability of the negative pressure channel filter 10.

[0082] Please see Figure 5 and Figure 6 The present invention also provides a treatment head, which includes a housing, a negative pressure component and a negative pressure channel filter 10. The housing has an inner cavity and a treatment opening, and the treatment opening communicates with the inner cavity. The negative pressure component is installed at the treatment opening. The negative pressure channel filter 10 is installed in the inner cavity and communicates with the negative pressure component.

[0083] The structure and function of the treatment head have been optimized. The housing, serving as the main structure of the treatment head, has an inner cavity and a treatment opening. The treatment opening communicates with the inner cavity, providing installation space and a gas flow channel for the negative pressure assembly and the negative pressure channel filter 10. The negative pressure assembly is installed at the treatment opening; its main function is to generate negative pressure, providing the necessary negative pressure environment for the treatment process, allowing gas to be drawn from the outside into the treatment head and filtered by the negative pressure channel filter 10. The negative pressure channel filter 10 is installed in the inner cavity of the housing and communicates with the negative pressure assembly.

[0084] During treatment, when the negative pressure component is working, gas is drawn in through the treatment opening, filtered and prevented from flowing back through the negative pressure channel filter 10, and then discharged from the outlet 10c. This structural design allows the treatment head to effectively filter the inhaled gas, preventing liquid backflow from adversely affecting the treatment process and equipment, thus improving the safety and reliability of the treatment.

[0085] Meanwhile, by integrating the negative pressure channel filter 10 with the negative pressure component into the housing, the structure of the treatment head is made more compact, which facilitates installation and use, and also makes it easier to maintain and replace the filter, ensuring the long-term stable operation of the treatment head.

[0086] This utility model also provides a treatment handle, including a handheld component and the aforementioned treatment head, wherein the treatment head and the handheld component are detachably connected. The detachable connection facilitates the replacement of the treatment head. The treatment head and the handheld component can be quickly and easily detached using various methods such as threads or snap-fit ​​connections.

[0087] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A negative pressure channel filter (10), characterized in that, The negative pressure channel filter (10) has a filter chamber (10a), an air inlet (10b) and an air outlet (10c), the air inlet (10b) and the air outlet (10c) being connected to the filter chamber (10a) respectively; and the air inlet (10b) is provided with a one-way valve (20) and a reset member (30), the reset member (30) being connected to the one-way valve (20); When the negative pressure channel filter is in negative pressure open, the negative pressure drives the one-way valve (20) away from the air inlet (10b); when the negative pressure channel filter is in negative pressure closed, the reset member (30) is used to drive the one-way valve (20) closer to the air inlet (10b).

2. The negative pressure channel filter (10) as described in claim 1, characterized in that, The reset member (30) is an elastic arm, which includes a deformable section (31) and a fixed part (32) connected to the deformable section (31). The end of the deformable section (31) away from the fixed part (32) is connected to the one-way valve (20).

3. The negative pressure channel filter (10) as described in claim 2, characterized in that, The fixing part (32) is provided on the inner wall of the air inlet (10b) or on the cavity wall of the filter cavity (10a).

4. The negative pressure channel filter (10) as described in claim 1, characterized in that, The one-way valve (20) includes a diaphragm (22) for covering the air inlet (10b) when closed under negative pressure.

5. The negative pressure channel filter (10) as described in claim 4, characterized in that, The edge of the diaphragm (22) is provided with a flange, and the flange is provided to fit the air inlet (10b) and elastically abut against the edge of the air inlet (10b).

6. The negative pressure channel filter (10) as described in claim 1, characterized in that, The filter chamber (10a) is provided with an anti-backflow channel (10d), the two ends of which are connected to the air inlet (10b) and the air outlet (10c) respectively. The anti-backflow channel (10d) is used to prevent backflow liquid from returning to the air inlet (10b).

7. The negative pressure channel filter (10) as described in claim 6, characterized in that, The filter chamber (10a) has a baffle (40) on its wall, and the baffle (40) and the filter chamber (10a) wall enclose the anti-backflow channel (10d).

8. The negative pressure channel filter (10) as described in claim 6, characterized in that, The cross-sectional shape of the anti-backflow channel (10d) is spiral.

9. The negative pressure channel filter (10) as described in claim 6, characterized in that, The air inlet (10b) is higher than the bottom wall of the anti-backflow channel (10d).

10. The negative pressure channel filter (10) as described in claim 6, characterized in that, The negative pressure channel filter (10) is also provided with a liquid storage chamber (10e), which is connected to the end of the anti-backflow channel (10d) away from the air inlet (10b) and the air outlet (10c).

11. The negative pressure channel filter (10) as described in claim 10, characterized in that, At least one of the anti-backflow channel (10d) and the liquid storage chamber (10e) is provided with an absorbent sponge (60) for absorbing backflow liquid.

12. The negative pressure channel filter (10) as described in claim 1, characterized in that, A waterproof and breathable membrane (50) is provided at the air outlet (10c).

13. A treatment head, characterized in that, The treatment head includes: A housing having an inner cavity and a treatment opening, the treatment opening communicating with the inner cavity; Negative pressure assembly, wherein the negative pressure assembly is installed at the treatment opening; and The negative pressure channel filter (10) as described in any one of claims 1 to 12 is installed in the inner cavity and communicates with the negative pressure assembly.

14. A treatment handpiece, characterized in that, It includes a handheld component and the treatment head as described in claim 13, wherein the treatment head and the handheld component are detachably connected.

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