Negative pressure suction apparatus

Abstract

A negative pressure suction apparatus, comprising a drainage device cavity, wherein the drainage device cavity comprises a first cavity and a second cavity which are sequentially connected from top to bottom in a vertical direction, one end of the first cavity away from the second cavity is of a stepped structure, with a higher step in the vertical direction being a first step, and a lower step being a second step; the first step is provided with a liquid inlet and a vent; the second step is provided with a negative pressure element, and a first exhaust hole and a second exhaust hole in communication with the negative pressure element, the negative pressure element passes through the second step, and a portion of the negative pressure element is arranged inside the drainage device cavity; a portion of the second exhaust hole is in communication with the drainage device cavity, so as to cause the drainage device cavity to be in communication with the negative pressure element; and the second hole is provided with a first breathable membrane, and the first breathable membrane permits unidirectional permeation of gas, such that gas flows from an interior of the second exhaust hole to an exterior thereof. The negative pressure suction apparatus can discharge a large amount of gas from within a drainage device cavity in a short period of time, reducing instances where gas is not completely discharged and remains within the drainage device cavity.

Description

A negative pressure suction device Technical Field

[0001] This application relates to the field of negative pressure drainage technology, specifically to a negative pressure suction device. Background Technology

[0002] Traditional continuous-compensation negative pressure drainage bags rely on the elasticity of a flexible tube to achieve negative pressure. However, the negative pressure range they can currently provide is limited to 10 to 25 kPa. Furthermore, this tube, made of plastic, is susceptible to fluctuations in elasticity due to factors such as the plastic material itself and the manufacturing process. Therefore, traditional designs face challenges in achieving high elasticity and cannot provide higher levels of negative pressure.

[0003] A search reveals that existing technologies, such as Chinese patent CN202120458219.1, disclose a continuous compensating negative pressure drainage device, including a drainage device cavity and a negative pressure component. The drainage device cavity has an exhaust port and an inlet port. The top of the drainage device cavity has a stepped structure, with the inlet port located at the high position of the stepped structure and the exhaust port located at the low position. The negative pressure component is installed at the low position of the stepped structure, and its airflow channel communicates with the inner cavity of the drainage device cavity. A first one-way valve is provided to generate negative pressure within the drainage device cavity. The airflow channel of the negative pressure component communicates with the exhaust port of the drainage device cavity and a second one-way valve is provided to exhaust air outwards. However, the aforementioned continuous compensating negative pressure drainage device has the following drawbacks in practical applications:

[0004] Firstly, since only one exhaust port is set up, it is impossible to expel a large amount of air from the cavity in a short time. Furthermore, outside air is easily drawn in when negative pressure is being drawn in, so the compensation effect is not obvious and the resulting negative pressure is still low.

[0005] Secondly, the second one-way valve is positioned low to connect with the drainage device cavity. When the drainage device cavity is not full of liquid, it soaks into the liquid-blocking plug. Excessive liquid soaking will affect the normal function of the liquid-blocking plug and may even cause liquid to flow into the negative pressure component.

[0006] Utility Model Content

[0007] To address the problems existing in the prior art, this application aims to provide a negative pressure suction device. The negative pressure suction device, by providing a first exhaust port and a second exhaust port, allows for the rapid discharge of a large amount of gas from the drainage device cavity. The first exhaust port discharges air from the negative pressure component, and the second exhaust port discharges air from the drainage device cavity, reducing the possibility of incomplete gas discharge and residual gas remaining in the drainage device cavity due to using the same exhaust port.

[0008] The negative pressure suction device described in this application includes:

[0009] The drainage device cavity includes a first cavity and a second cavity connected vertically from top to bottom. The end of the first cavity away from the second cavity has a stepped structure, with the higher step in the vertical direction being the first step and the lower step being the second step.

[0010] The first step is provided with a liquid inlet and a vent.

[0011] The second step is provided with a negative pressure component, and a first exhaust port and a second exhaust port connected to the negative pressure component. The negative pressure component passes through the second step, and part of the negative pressure component is disposed inside the drainage device cavity.

[0012] The second vent is connected to the drainage device cavity, so that the drainage device cavity is connected to the negative pressure component;

[0013] The second exhaust port is provided with a first breathable membrane, which is a one-way breathable membrane through which gas flows from the inside of the second exhaust port to the outside.

[0014] Preferably, the surface of the drainage device cavity has an arc-shaped structure, and the cross-section of the drainage device cavity in the horizontal direction is crescent-shaped.

[0015] Preferably, the first exhaust port is provided with a grille, and the bottom of the grille is provided with a first exhaust one-way valve, wherein the exhaust direction of the first exhaust one-way valve is from the inside of the first exhaust port to the outside.

[0016] Preferably, the second exhaust port has at least one air intake on the port wall, the second exhaust port is connected to the drainage device cavity through the air intake, and the second exhaust port has a first liquid blocking element near the air intake;

[0017] A second exhaust check valve is provided at the connection between the second exhaust port and the negative pressure component. The exhaust direction of the second exhaust check valve is from the second exhaust port toward the negative pressure component.

[0018] Preferably, the negative pressure component includes a piston mechanism, which includes a piston rod, a piston chamber, and a spring;

[0019] One end of the piston rod is slidably connected to the piston cavity, and the other end extends away from the piston cavity. An external force causes the piston rod to move closer to the piston cavity.

[0020] The spring is disposed inside the piston cavity. One end of the spring is connected to the bottom of the piston cavity, and the other end is connected to the surface of the piston rod near the piston cavity. The spring force causes the piston rod to move away from the piston cavity.

[0021] Preferably, the surface of the piston rod away from the piston cavity is provided with a plurality of recessed structures, and the plurality of recessed structures are arranged at intervals.

[0022] The outer surface of the piston rod is engraved with pressure markings.

[0023] Preferably, the second cavity has a drain outlet at the end away from the first cavity, and the drain outlet is connected to a cover.

[0024] Preferably, the second cavity is transparent, and the outer surface of the second cavity is engraved with volume scales for observing the liquid inside.

[0025] Preferably, the drainage device cavity is provided with a venting cylinder near the vent. The venting cylinder is a hollow structure with two connected ends. One end of the venting cylinder is connected to the vent, and the other end is connected to the interior of the drainage device cavity. The interior of the venting cylinder is provided with a second liquid-blocking element and a second breathable membrane. The second breathable membrane is a one-way breathable membrane that allows gas to flow from the interior of the drainage device cavity to the exterior.

[0026] The vent is provided with a soft plug, which is used to seal the vent.

[0027] Preferably, the first cavity has a connecting groove adapted to the end of the second cavity, and the end of the second cavity near the first cavity is embedded in the connecting groove to realize the connection between the first cavity and the second cavity.

[0028] The negative pressure suction device described in this application has the following advantages:

[0029] A negative pressure suction device according to this application includes a drainage chamber, which includes a first chamber and a second chamber connected vertically from top to bottom. The end of the first chamber away from the second chamber has a stepped structure, with the higher step in the vertical direction being the first step and the lower step being the second step. The first step is provided with a liquid inlet and a vent. The second step is provided with a negative pressure element and a first vent and a second vent communicating with the negative pressure element. The negative pressure element passes through the second step and is partially disposed inside the drainage chamber. The second vent is partially communicating with the drainage chamber so that the drainage chamber is connected to the negative pressure element. The second vent is provided with a first breathable membrane, which is a one-way breathable membrane that allows gas to flow from the inside of the second vent to the outside. By providing a first vent and a second vent, a large amount of gas in the drainage device cavity can be discharged in a short time. The first vent can discharge the air in the negative pressure component, and the second vent can discharge the air in the drainage device cavity. This reduces the situation where gas is not completely discharged and remains in the drainage device cavity due to using the same vent, thus enabling the generation of a sufficiently large negative pressure. Attached Figure Description

[0030] Figure 1 is a schematic diagram of the structure of a negative pressure suction device according to this application;

[0031] Figure 2 is an exploded view of Figure 1;

[0032] Figure 3 is a first cross-sectional view of the negative pressure suction device described in this application in the vertical direction;

[0033] Figure 4 is a second cross-sectional view of the negative pressure suction device described in this application in the vertical direction;

[0034] Figure 5 is a partial structural diagram of A in Figure 4;

[0035] Figure 6 is a cross-sectional view of a negative pressure suction device described in this application in the horizontal direction.

[0036] Explanation of reference numerals in the attached drawings: 10-Drainage device cavity; 101-First cavity; 1011-Liquid inlet; 1012-Vent port; 102-Second cavity; 1021-Drain port; 20-Negative pressure component; 201-First exhaust port; 202-Second exhaust port; 2021-Intake port; 203-Piston mechanism; 2031-Piston column; 2032-Piston chamber; 2033-Spring; 30-First breathable membrane; 40-Grate; 50-Cover; 60-Soft plug; 70-First exhaust check valve; 80-Second exhaust check valve; 90-Ventilation cylinder; 100-First liquid blocking component; 110-Second liquid blocking component; 120-Second breathable membrane. Detailed Implementation

[0037] As shown in Figures 1-6, the negative pressure suction device of this application includes:

[0038] The drainage device cavity 10 includes a first cavity 101 and a second cavity 102 connected sequentially from top to bottom in the vertical direction. The end of the first cavity 101 away from the second cavity 102 has a stepped structure, with the higher step in the vertical direction as the first step and the lower step as the second step.

[0039] The first step is provided with an inlet 1011 and a vent 1012. The inlet 1011 is used to connect the hose. One end of the hose is connected to the inlet 1011, and the other end is connected to the part that needs negative pressure drainage. A stop clamp is set on the hose. The hose is closed by the stop clamp to prevent air or liquid from flowing into the drainage device cavity 10.

[0040] The second step is provided with a negative pressure component 20, and a first exhaust port 201 and a second exhaust port 202 connected to the negative pressure component 20. The negative pressure component 20 passes through the second step, and part of the negative pressure component 20 is disposed inside the drainage device cavity 10.

[0041] The second exhaust port 202 is connected to the drainage chamber 10 so that the drainage chamber 10 is connected to the negative pressure component 20.

[0042] The second exhaust port 202 is provided with a first breathable membrane 30. The first breathable membrane 30 is a one-way breathable membrane for gas to flow from the inside of the second exhaust port 202 to the outside. The first breathable membrane 30 is a suction breathable membrane, made of PTFE (polytetrafluoroethylene) material, which has the characteristics of being breathable but not liquid-permeable.

[0043] Furthermore, in this embodiment, the surface of the drainage cavity 10 has an arc-shaped structure, and the cross-section of the drainage cavity 10 in the horizontal direction is crescent-shaped; as shown in Figure 6, the cross-sectional boundary of the drainage cavity 10 is a multi-segment connected arc-shaped structure, which are connected to form a crescent-shaped cross-section.

[0044] Furthermore, in this embodiment, a grille 40 is provided on the first exhaust port 201, and a first exhaust one-way valve 70 is provided at the bottom of the grille 40. The exhaust direction of the first exhaust one-way valve 70 is from the inside of the first exhaust port 201 to the outside. By setting the first exhaust one-way valve 70, the situation where external gas flows into the negative pressure component 20 from the first exhaust port 201 can be prevented.

[0045] Furthermore, in this embodiment, the second exhaust port 202 is provided with at least one air intake port 2021 on the port wall. The second exhaust port 202 is connected to the drainage device cavity 10 through the air intake port 2021, and the second exhaust port 202 is provided with a first liquid blocking element 100 near the air intake port 2021. In this embodiment, three air intake ports 2021 are provided. The first liquid blocking element 100 is made of ultra-high molecular weight polyethylene and hydroxyethyl starch, which can expand when wetted by liquid, thus preventing liquid from entering the second exhaust port 202.

[0046] A second exhaust check valve 80 is provided at the connection between the second exhaust port 202 and the negative pressure component 20. The exhaust direction of the second exhaust check valve 80 is from the second exhaust port to the negative pressure component 20.

[0047] Furthermore, in this embodiment, the negative pressure component 20 includes a piston mechanism 203, which includes a piston rod 2031, a piston chamber 2032, and a spring 2033.

[0048] One end of the piston rod 2031 is slidably connected to the piston chamber 2032, and the other end extends away from the piston chamber 2032. The piston rod 2031 moves closer to the piston chamber 2032 by external force.

[0049] Spring 2033 is disposed in piston chamber 2032. One end of spring 2033 is connected to the bottom of piston chamber 2032, and the other end is connected to the surface of piston rod 2031 near piston chamber 2032. The elastic force of spring 2033 causes piston rod 2031 to move away from piston chamber 2032. Spring is selected as compression spring.

[0050] Specifically, by pressing the end of the piston rod 2031 away from the piston cavity 2032 with external force, the piston rod 2031 moves closer to the piston cavity 2032 and presses against the spring 2033, causing the spring 2033 to compress. By releasing the pressure on the piston rod 2031, the piston rod 2031 is no longer subject to external force, and the elastic force of the spring 2033 causes the piston rod 2031 to move away from the piston cavity 2032, and then the piston rod 2031 returns to its initial position.

[0051] Furthermore, in this embodiment, the surface of the piston column 2031 away from the piston cavity 2032 is provided with a plurality of recessed structures, and the plurality of recessed structures are arranged at intervals; the intervald recessed structures make the space between two recessed structures convex, which can increase the force-bearing area when pressing, so as to make pressing easier.

[0052] The outer surface of the piston rod 2031 is engraved with pressure scales to observe the pressure generated when the piston rod 2031 is pressed.

[0053] Furthermore, in this embodiment, the second cavity 102 is provided with a liquid outlet 1021 at the end away from the first cavity 101, and the liquid outlet 1021 is connected to a cover 50; the liquid outlet 1021 is provided with an external thread, and the cover 50 has an internal thread adapted to the liquid outlet 1021, and the connection between the cover 50 and the liquid outlet 1021 is a threaded connection.

[0054] Furthermore, in this embodiment, the second cavity 102 is transparent, and the outer surface of the second cavity 102 is engraved with volume scale for observing the liquid inside.

[0055] Furthermore, in this embodiment, the drainage device cavity 10 is provided with a vent 90 near the vent 1012. The vent 90 is a hollow structure with both ends connected. One end of the vent 90 is connected to the vent 1012, and the other end is connected to the interior of the drainage device cavity 10. The interior of the vent 90 is provided with a second liquid-blocking element 110 and a second breathable membrane 120. The second breathable membrane 120 is a one-way breathable membrane that allows gas to flow from the interior of the drainage device cavity 10 to the exterior. The second liquid-blocking element 110 is made of ultra-high molecular weight polyethylene and hydroxyethyl starch. It can expand when wetted by liquid and can prevent liquid from flowing out of the vent 1012. The second breathable membrane 120 is a liquid-blocking and breathable membrane made of PTFE (polytetrafluoroethylene) material, which has the function of being breathable but not liquid-permeable.

[0056] A soft plug 60 is provided on the vent 1012. The soft plug 60 is used to close the vent 1012. Specifically, inserting the soft plug 60 into the vent 1012 can close the vent 1012, and removing the soft plug 60 can open the vent 1012.

[0057] Furthermore, in this embodiment, the first cavity 101 has a connecting groove adapted to the end of the second cavity 102, and the end of the second cavity 102 near the first cavity 101 is embedded in the connecting groove to realize the connection between the first cavity 101 and the second cavity 102.

[0058] The working principle of a negative pressure suction device according to this embodiment will be fully explained below in conjunction with the above content.

[0059] A negative pressure suction device has two modes for use: negative pressure drainage mode and gravity drainage mode.

[0060] The working principle of negative pressure drainage mode is as follows:

[0061] First, insert a soft plug 60 into the ventilation port 1012, connect the inlet port 1011 to one end of the tubing, and use a flow stop clamp to close the tubing to prevent air from entering the drainage device cavity 10 through the tubing. The other end of the tubing is placed at the patient's wound.

[0062] Next, the second exhaust check valve 80 is opened, and the first exhaust check valve 70 is closed. The piston column 2031 is pressed by external force, causing it to move closer to the piston chamber 2032, thereby compressing the spring 2033. The piston column 2031 is pressed to the required pressure mark and then released. The piston column 2031 moves away from the piston chamber 2032 due to the elastic force of the spring 2033. At the same time, the gas in the drain chamber 10 enters the second exhaust port 202 through the three air intake ports 2021 and enters the piston chamber 2032 through the second exhaust check valve 80. The gas in the drain chamber 10 enters the piston chamber 2032, creating a certain negative pressure inside the drain chamber 10.

[0063] Then, close the second exhaust check valve 80, open the first exhaust check valve 70, and press the piston column 2031 again with external force to allow the gas in the piston chamber 2032 to enter the first exhaust port 201 and flow out to the outside of the first exhaust port 201 through the first exhaust check valve 70.

[0064] Finally, open the stop clamp and use the negative pressure inside the drainage device cavity 10 to drain the liquid into the drainage device cavity 10. After the drainage is completed, the liquid in the drainage device cavity 10 can be poured out from the drain port 1021 by unscrewing the cover 50.

[0065] The working principle of gravity-based drainage mode is as follows:

[0066] First, connect the inlet 1011 to one end of the tubing and close the tubing with a stop clamp to prevent air from entering the drainage chamber 10 through the tubing. Place the other end of the tubing at the patient's wound and position the drainage chamber 10 vertically below the patient's wound so that there is a certain height difference between the drainage chamber 10 and the patient's wound.

[0067] Then, remove the soft plug 60 from the vent 1012, open the flow stop clamp, and press the end of the piston column 2031 away from the piston chamber 2032 with external force, so that the piston column 2031 moves closer to the piston chamber 2032. At this time, the liquid is guided into the drain chamber 10 by gravity.

[0068] Finally, after the drainage is completed, the liquid in the drainage device cavity 10 can be poured out from the drain port 1021 by unscrewing the cap 50.

[0069] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application.

[0070] For those skilled in the art, various other corresponding changes and modifications can be made based on the technical solutions and concepts described above, and all such changes and modifications should fall within the protection scope of the claims of this application.

Claims

1. A negative pressure suction device, characterized in that, include: The drainage device cavity (10) includes a first cavity (101) and a second cavity (102) connected sequentially from top to bottom in the vertical direction. The end of the first cavity (101) away from the second cavity (102) has a stepped structure, with the higher step in the vertical direction as the first step and the lower step as the second step. The first step is provided with a liquid inlet (1011) and a vent (1012); The second step is provided with a negative pressure component (20) and a first exhaust port (201) and a second exhaust port (202) connected to the negative pressure component (20). The negative pressure component (20) passes through the second step, and the negative pressure component (20) is partially disposed inside the drainage device cavity (10). The second exhaust port (202) is partially connected to the drainage device cavity (10) so that the drainage device cavity (10) is connected to the negative pressure member (20); The second exhaust port (202) is provided with a first breathable membrane (30), which is a one-way breathable membrane for gas to flow from the inside of the second exhaust port (202) to the outside.

2. The negative pressure suction device according to claim 1, wherein The surface of the drainage device cavity (10) has an arc-shaped structure, and the cross-section of the drainage device cavity (10) in the horizontal direction is crescent-shaped.

3. The negative pressure suction device of claim 1, wherein, The first exhaust port (201) is provided with a grille (40), and the bottom of the grille (40) is provided with a first exhaust one-way valve (70). The exhaust direction of the first exhaust one-way valve (70) is from the inside of the first exhaust port (201) to the outside.

4. The negative pressure suction device of claim 1, wherein, The second exhaust port (202) has at least one air intake port (2021) on the hole wall. The second exhaust port (202) is connected to the drainage device cavity (10) through the air intake port (2021). The second exhaust port (202) has a first liquid blocking element (100) near the air intake port (2021). A second exhaust check valve (80) is provided at the connection between the second exhaust port (202) and the negative pressure component (20). The exhaust direction of the second exhaust check valve (80) is from the second exhaust port (202) to the negative pressure component (20).

5. The negative pressure suction device of claim 1, wherein, The negative pressure component (20) includes a piston mechanism (203), which includes a piston rod (2031), a piston chamber (2032), and a spring (2033). One end of the piston rod (2031) is slidably connected to the piston cavity (2032), and the other end extends away from the piston cavity (2032). The piston rod (2031) moves closer to the piston cavity (2032) by external force. The spring (2033) is disposed in the piston chamber (2032). One end of the spring (2033) is connected to the bottom of the piston chamber (2032), and the other end is connected to the surface of the piston rod (2031) near the piston chamber (2032). The spring force of the spring (2033) causes the piston rod (2031) to move away from the piston chamber (2032).

6. The negative pressure suction device of claim 5, wherein, The piston rod (2031) has a plurality of recessed structures on the end surface away from the piston cavity (2032), and the plurality of recessed structures are arranged at intervals. The outer surface of the piston rod (2031) is engraved with pressure markings.

7. The negative pressure drainage device of claim 1, wherein, The second cavity (102) has a liquid outlet (1021) at one end away from the first cavity (101), and the liquid outlet (1021) is connected to a cover (50).

8. The negative pressure drainage device of claim 1, wherein, The second cavity (102) is transparent, and the outer surface of the second cavity (102) is engraved with volume scale for observing the liquid inside.

9. The negative pressure drainage device of claim 1, wherein, The drainage device cavity (10) is provided with a vent (90) near the vent (1012). The vent (90) is a hollow structure with both ends connected. One end of the vent (90) is connected to the vent (1012), and the other end is connected to the interior of the drainage device cavity (10). The interior of the vent (90) is provided with a second liquid blocking element (110) and a second breathable membrane (120). The second breathable membrane (120) is a one-way breathable membrane that allows gas to flow from the interior of the drainage device cavity (10) to the exterior. The vent (1012) is provided with a soft plug (60), which is used to close the vent (1012).

10. The negative pressure drainage device of claim 1, wherein, The first cavity (101) has a connecting groove adapted to the end of the second cavity (102), and the end of the second cavity (102) near the first cavity (101) is embedded in the connecting groove to realize the connection between the first cavity (101) and the second cavity (102).

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