Negative pressure drainage device

Abstract

The invention provides a negative pressure drainage device which at least solves the technical problem that in the prior art, a large amount of foreign matter such as fester and interstitial fluid is accumulated. The negative pressure drainage device comprises a shell, a drainage pipe, a flushing pipe and a screw, an opening is formed in the bottom of the shell and can form a semi-closed inner cavity, the screw comprises a rotating shaft and spiral blades, the screw is installed in the inner cavity through the rotating shaft so that the screw can rotate relative to the shell, the flushing pipe is located at the first end of the screw, and the drainage pipe is located at the second end of the screw. Sterile water entering the inner cavity from the flushing pipe reaches the second end of the screw through the first end of the screw and then is transferred from the drainage pipe, and the drainage pipe can be connected with a negative pressure pipeline so that negative pressure can be formed in the inner cavity. The flushing pipe can provide sterile water and / or sterile air, the drainage pipe can transfer the sterile water and / or sterile air in the inner cavity, and substances such as fester and interstitial fluid in part of the inner cavity can be taken away under the action of water flow and / or air flow.

Description

Technical Field

[0001] The present application relates to the field of medical devices, and particularly to a negative pressure drainage device disposed at a wound. Background Art

[0002] In clinical practice, if a wound or a wound surface is exposed, it is prone to infection. Even if the wound or the wound surface is closed, it will also become infected and suppurate due to various reasons. Therefore, negative pressure closed drainage technology is usually required at the wound or the wound surface to timely clean and irrigate the infected area. Negative pressure can make the wound tissue fit together, reduce dead space, accelerate the discharge of exudate, inhibit the reproduction of bacteria, form an antibacterial environment by using a closed semi-permeable membrane, and at the same time maintain a moist condition to facilitate epithelialization. The infection degrees of different patients are different, and the necrotic tissues of the wound surface are also different. Therefore, for some patients, the wound is larger or the infection is more serious due to other reasons. When using a negative pressure closed drainage device, it is easy to be blocked, and substances such as pus and tissue fluid accumulate in dead corners, making the wound or the wound surface unable to be kept clean. Even if a flushing pipeline is provided, due to the certain adhesion of some foreign substances such as pus and tissue fluid, they cannot be cleaned in time, which may cause secondary infection and affect the healing of the wound or the wound surface.

[0003] The patent application with the Chinese patent publication number "CN 103495259A" and the name of "Double-hole sucker negative pressure drainage device" discloses a double-hole sucker negative pressure drainage device with an easy-to-block drainage outer tube and flushing tube and good negative pressure drainage effect. A separate drainage channel and a flushing channel are provided in the sucker, and the negative pressure drainage and flushing work are carried out through their respective channels. The substances such as pus and tissue fluid sucked under negative pressure only flow out from the drainage channel and the drainage outer tube, but it is easy to be blocked near the suction holes. The setting of the first and second drainage grooves will have more dead corners, making it easier for substances such as pus and tissue fluid to accumulate, resulting in secondary infection.

[0004] The patent application with the Chinese patent publication number "CN103961791B" and the name of "Spliced negative pressure closed drainage device and negative pressure closed drainage method" discloses a spliced negative pressure closed drainage device and a negative pressure closed drainage method. The flushing tube is independent and can centrally flush multiple VSD sponge blocks, but each flushing tube still has a risk of blockage or foreign matter accumulation, which is easy to cause infection.

[0005] The patent application with the Chinese patent publication number "CN105944220A" and the name "Flushable negative pressure drainage device" discloses a flushable negative pressure drainage device applied to negative pressure wound treatment. The multi - cavity catheter is provided with a drainage cavity and a flushing cavity. At one end connected to the negative pressure suction cup, the flushing cavity passes through the suction cup, and the end contacts the middle layer of the "sandwich" - type sponge body, facilitating the rapid arrival of the flushing liquid at the middle layer. At the end connected to the special - shaped joint, the drainage cavity communicates with the front end of the special - shaped joint, and the flushing cavity communicates with the Luer connecting tube at the top of the special - shaped joint, and is sealed with a cap at the same time. However, it does not solve the problem of the accumulation of substances such as pus and tissue fluid in dead corners.

[0006] The patent application with the Chinese patent announcement number "CN109010954B" and the name "A negative pressure drainage and debridement device for diabetic foot" discloses a negative pressure drainage and debridement device for diabetic foot that can stably prevent the blockage of the negative pressure suction pipeline, has a simple structure and low cost. This device mainly considers the problem of pipeline blockage and does not consider the problem of wound cleaning. Its main purpose is to break through with threads, but it does not solve the problem of the accumulation of substances such as pus and tissue fluid in the dead corners near the wound surface. Summary of the Invention

[0007] This application provides a negative pressure drainage device to at least solve the technical problem of the large accumulation of foreign substances such as pus and tissue fluid in the prior art.

[0008] According to the first aspect of this application, a negative pressure drainage device is provided, including a housing, a drainage tube, a flushing tube, and a screw. The bottom of the housing is provided with an opening to form a semi - enclosed inner cavity. The screw includes a rotating shaft and a spiral blade. The screw is installed in the inner cavity through the rotating shaft so that the screw can rotate relative to the housing. The flushing tube is located at the first end of the screw, and the drainage tube is located at the second end of the screw. The sterile water entering the inner cavity from the flushing tube reaches the second end of the screw after passing through the first end of the screw and is transferred from the drainage tube. The drainage tube can be connected to a negative pressure pipeline so that the inner cavity can form a negative pressure.

[0009] Compared with the prior art, the negative pressure drainage device of this application has the following beneficial effects: The flushing tube can provide sterile water and / or sterile air, and the drainage tube can transfer the sterile water and / or sterile air in the lumen. Under the action of water flow and / or air flow, it can carry away substances such as pus and tissue fluid in part of the lumen. For substances that are difficult to remove, part of them can be scraped off when the screw rotates. In addition, the rotation of the screw can also change the direction of the local water flow or air flow, and can also improve the cleaning effect. The sterile water reaches from the first end to the second end across the entire dressing layer, can reach the edge of the dressing layer, and has a good overall flushing effect. The power for the screw rotation can be provided externally, such as manual rotation or using an electric drive method. It can also be driven by setting a water wheel and using the energy of water flow or air flow. It can also adopt a combination of the two, that is, giving priority to water wheel drive and using manual or electric drive when the water wheel cannot rotate.

[0010] In an implementable embodiment, a dressing layer is provided at the opening of the housing, and the housing is provided with an adhesive layer so that the housing is fixed to the wound through the adhesive layer, making the fixation more convenient.

[0011] In an implementable embodiment, the second end of the screw is provided with water wheel blades. The water wheel blades adopt a spiral design and the spiral direction is the same as that of the screw. The water wheel blades are provided with a plurality of rotating shafts circumferentially distributed. In this way, no external power needs to be provided, and the power can be provided only by the flushing tube and the drainage tube. The flushing tube provides water pressure, and the drainage tube provides negative pressure. The pressure difference can make the fluid flow quickly, and the flowing fluid can drive the water wheel blades to rotate, thus driving the screw to rotate.

[0012] In an implementable embodiment, the second end of the screw is provided with arc-shaped blades. The arc-shaped blades are provided with a plurality of rotating shafts circumferentially distributed. The inlet of the drainage tube is located radially on the arc-shaped blades and on the upper side of the arc-shaped blades. The arc-shaped blades can generate driving force using the radial fluid. The arc-shaped blades can bend to one side. The flow resistance on the inner side of the bend is greater than that on the outer side of the bend. When the fluid flows radially through the arc-shaped blades, the uneven force on both sides can generate a force difference, and the flow direction on the side with the larger flow resistance is the direction of the driving force. The radial flow design can reduce the length of the rotating shaft compared with the axial flow, and can reduce the volume of the device.

[0013] In an implementable embodiment, the screw includes a first screw, a second screw, a third screw, and a fourth screw. The first screw and the second screw are adjacent and have opposite spiral directions. The third screw and the fourth screw are adjacent and have opposite spiral directions. The third screw and the second screw are adjacent and have opposite spiral directions. Gears are provided on the rotating shaft so that the adjacent screws are driven through the gears and rotate in opposite directions. In this way, different screws can rotate synchronously even if they are subjected to different forces. The rotating screws can move a large amount of foreign matter along the fluid flow direction, and can achieve a better cleaning effect. Multiple screws make the cleaning effect at different positions more balanced.

[0014] In one implementable embodiment, an isolation net is provided at the opening of the housing, and a dressing layer is provided outside the isolation net. The dressing layer can reduce the space between the negative pressure drainage device and the wound. In addition, the dressing layer can adsorb a certain amount of antibacterial drugs to enable the wound to have a better rehabilitation effect.

[0015] In one implementable embodiment, the housing is provided with a first flushing channel and a second flushing channel. The first flushing channel communicates with the inner cavity, and the second outlet of the second flushing channel is located between the isolation net and the dressing layer. Different channels can be opened as needed to flush different positions, which can increase the local flow rate and achieve a better flushing effect.

[0016] In one implementable embodiment, there are multiple first outlets of the first flushing channel, and the first outlets are located on the lower side between two adjacent screws. The lower side of the screw is closer to the wound surface, so it has a better function of cleaning the wound surface. In addition, the inlet of the drainage tube is located on the upper side of the rotating shaft, so that a large amount of fluid can generate a greater driving force when reaching the upper side from the lower side of the arc-shaped blade.

[0017] In one implementable embodiment, the housing includes a first inner cavity and a second inner cavity. The spiral blade is located in the first inner cavity, the rotating shaft passes through the first inner cavity to reach the second inner cavity, and the gear is arranged in the second inner cavity. This design avoids the gear being affected by foreign objects and increasing the meshing resistance. Both the first inner cavity and the second inner cavity are in a semi-closed state, and a relatively large gap can be set between the rotating shaft and the housing to reduce the rotation resistance.

[0018] In one implementable embodiment, the housing is installed with a drive shaft in a rotatable and axially movable manner. The drive shaft is located axially on the rotating shaft, and the axial movement of the drive shaft can be inserted into or separated from the rotating shaft. The drive shaft serves to seal the second inner cavity. In addition, the rotating shaft can be driven to rotate through the drive shaft. Different patients have different degrees of infection. If a large amount of foreign objects are generated, the screw cannot be driven by the water turbine blade or the arc-shaped blade, and the screw cannot rotate, thus losing its main function. By setting the drive shaft externally, a relatively large driving force can be input into the rotating shaft to enable the rotating shaft to rotate. In this way, the foreign objects can move in the spiral direction under the action of the rotating screw, reducing the accumulation of wound pus and tissue fluid.

[0019] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features, and advantages of the exemplary embodiments of the present application will become easily understood. In the drawings, several embodiments of the present application are shown in an exemplary rather than restrictive manner, where: In the drawings, the same or corresponding reference numerals represent the same or corresponding parts.

[0021] Figure 1 Shows a three-dimensional schematic diagram of the composition structure of the negative pressure drainage device according to Embodiment 1 of the present application Figure 1 ; Figure 2 Shows a top view schematic diagram of the negative pressure drainage device according to Embodiment 1 of the present application; Figure 3 Shows Figure 2 A cross-sectional schematic diagram at A-A in Figure 4 Shows Figure 2 A cross-sectional schematic diagram at B-B in Figure 5 Shows Figure 2 A cross-sectional schematic diagram at C-C in Figure 6 Shows Figure 2 A cross-sectional schematic diagram at D-D in Figure 7 Shows a screw assembly schematic diagram of the negative pressure drainage device according to Embodiment 1 of the present application Figure 1 ; Figure 8 Shows a screw assembly schematic diagram of the negative pressure drainage device according to Embodiment 1 of the present application Figure 2 ; Figure 9 Shows a three-dimensional schematic diagram of the composition structure of the negative pressure drainage device according to Embodiment 1 of the present application Figure 2 ; Figure 10 Shows a screw assembly schematic diagram of the negative pressure drainage device according to Embodiment 2 of the present application; Figure 11 Shows a cross-sectional structure schematic diagram of the negative pressure drainage device according to Embodiment 2 of the present application; Figure 12 Shows a cross-sectional structure schematic diagram of the negative pressure drainage device according to Embodiment 3 of the present application.

[0022] Description of the reference numerals in the figure: 1. Housing; 2. Drainage tube; 3. Flushing tube; 4. Screw; 5. Dressing layer; 6. Adhesive layer; 7. Drive shaft; 8. Exhaust groove; 9. Sealing adhesive ring; 10. Inner cavity; 11. Inner cavity wall; 12. Isolation net; 13. First flushing channel; 14. Second flushing channel; 15. Second outlet; 16. First outlet; 17. Left outlet; 18. Middle outlet; 19. Right outlet; 20. Inlet; 21. Deflector; 34. Bush; 40. Hexagonal hole; 41. Rotating shaft; 42. Spiral blade; 43. First end; 44. Second end; 45. Arc blade; 46. First screw; 47. Second screw; 48. Third screw; 49. Fourth screw; 50. Gear; 51. Transmission wheel; 71. Inner hexagonal hole; 72. Hexagonal projection; 73. Electric drive device; 74. Water turbine blade; 75. Steel sheet; 101. First inner cavity; 102. Second inner cavity. Detailed implementation manners

[0023] To make the objectives, features, and advantages of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present application.

[0024] Embodiment 1: As Figure 1 、 Figure 2 and Figure 3 shown, a negative pressure drainage device includes a housing 1, a drainage tube 2, a flushing tube 3, and a screw 4. An opening is provided at the bottom of the housing 1 to form a semi-closed inner cavity 10. The screw 4 includes a rotating shaft 41 and a spiral blade 42. The screw 4 is installed in the inner cavity 10 through the rotating shaft 41 so that the screw 4 can rotate relative to the housing 1. The flushing tube 3 is located at the first end 43 of the screw 4, and the drainage tube 2 is located at the second end 44 of the screw 4. The sterile water entering the inner cavity 10 from the flushing tube 3 reaches the second end 44 of the screw 4 after passing through the first end 43 of the screw 4 and is then transferred through the drainage tube 2. The drainage tube 2 can be connected to a negative pressure pipeline or device so that a negative pressure can be formed in the inner cavity 10. The drainage tube 2 and the flushing tube 3 are provided with connectors and can be connected to other pipelines through the connectors. The flushing tube 3 can be connected to a container of sterile water or antibacterial liquid medicine so that the sterile water or antibacterial liquid medicine can enter the inner cavity 10. In addition, to ensure that the inner cavity 10 has an appropriate humidity, sterile dry air can be introduced into the inner cavity 10 from the flushing tube 3 as appropriate. To reduce costs, the screw 4 can be manufactured by an injection molding process, and the housing 1 is made of silicone.

[0025] As Figure 1 and Figure 3As shown, in one implementable embodiment, a dressing layer 5 is provided at the opening of the housing 1. The dressing layer 5 has a certain elasticity, which can enable the wound surface to better match the negative pressure drainage device and avoid large local protrusions. The dressing layer 5 is provided with antibacterial drugs that can inhibit the growth of microorganisms to a certain extent, such as containing silver ions or antibiotic components. Additionally, it contains growth factors or collagen, which can stimulate tissue regeneration. The housing 1 is provided with an adhesive layer 6, so that the housing 1 is fixed to the wound through the adhesive layer 6. The adhesive layer 6 requires good adhesiveness and light transmittance. A waterproof and breathable PU film can be used to avoid the accumulation of water vapor between the PU film and the skin, extend the fixation time, prevent the invasion of moisture and bacteria, protect the adhered position from external bacterial infection, and has good air permeability. The housing 1 is made of transparent silica gel and can directly observe the situation of the inner cavity 10 from outside the housing 1 for flushing according to the internal situation.

[0026] As Figure 6 and Figure 7 shown, in one implementable embodiment, an arc-shaped blade 45 is provided at the second end 44 of the screw 4. The arc-shaped blade 45 is provided with a plurality of rotating shafts 41 evenly distributed in the circumferential direction. In this way, the bending directions of the arc-shaped blades 45 are the same. The inlet 20 of the drainage tube 2 is located on the radial direction of the arc-shaped blade 45 and on the upper side of the arc-shaped blade 45. The spiral blade 42 on the screw 4 has a certain spiral direction. The arc-shaped blade 45 can also be designed in a spiral shape, so that the power is more stable, there will be no tremor when the rotation speed is high, and the overall operation vibration is smaller. In order to achieve a faster flow rate, the spiral direction of the arc-shaped blade 45 is opposite to the spiral direction of the screw 4. In this way, the rotation resistance of the arc-shaped blade 45 is smaller, the rotation speed is faster, and the conveying and cleaning effect of the screw 4 is better.

[0027] As Figure 6 and Figure 7 shown, the outer diameter of the arc-shaped blade 45 near the screw 4 is larger than the outer diameter of the arc-shaped blade 45 far from the screw 4. The inner cavity 10 has the same inner diameter at the position of the arc-shaped blade 45. In this way, the gap between the arc-shaped blade 45 and the inner cavity wall 11 at the end far from the screw 4 is larger than the gap between the arc-shaped blade 45 and the inner cavity wall 11 at the end near the screw 4. The inlet 20 of the drainage tube 2 is arranged on the radial direction of the arc-shaped blade 45 at the end far from the screw 4. In this way, a large amount of fluid can be generated in the radial direction of the arc-shaped blade 45 when the flushing tube 3 is flushing to drive the arc-shaped blade 45 to rotate. A flow guide plate 21 is provided near the inlet 20. The flow guide plate 21 is arranged according to the liquid flow direction, and the specific number can be set according to needs.

[0028] As Figure 6 and Figure 7As shown, the average radius of curvature of the cross-section of the arc-shaped blade 45 near one end of the screw 4 is smaller than that of the cross-section of the arc-shaped blade 45 far from one end of the screw 4, that is, the bending degree of the arc-shaped blade 45 near one end of the screw 4 is greater than that of the arc-shaped blade 45 far from one end of the screw 4. The axial movement generated by the fluid at the end of the arc-shaped blade 45 near the screw 4 is greater than that generated at the end of the arc-shaped blade 45 far from the screw 4. The size of the torque provided is mainly considered at the end of the arc-shaped blade 45 near the screw 4, and the size of the fluid flow rate needs to be taken into account at the end of the arc-shaped blade 45 far from the screw 4. The greater the flow rate, the greater the output power and the better the cleaning effect.

[0029] As Figure 7 and Figure 8 shown, in an implementable manner, the screw 4 includes a first screw 46, a second screw 47, a third screw 48, and a fourth screw 49. The first screw 46 and the second screw 47 are adjacent and have opposite spiral directions. The third screw 48 and the fourth screw 49 are adjacent and have opposite spiral directions. The third screw 48 and the second screw 47 are adjacent and have opposite spiral directions. A gear 50 is provided on the rotating shaft 41 so that adjacent screws 4 are driven through the gear 50 and rotate in opposite directions. The number of screws 4 can be adjusted according to actual needs. The thinner the screw 4, the more the number required, the better the cleaning ability, but the greater the resistance, and it is more difficult to drive through the fluid, so manual drive or electric drive may be required to rotate the screw 4. Setting a single screw 4 has the least resistance, but the action range of a single screw 4 is limited and is basically on a straight line. Therefore, different numbers and sizes can be set according to the needs of different wounds.

[0030] As Figure 4 and Figure 5 shown, in an implementable manner, an isolation net 12 is provided at the opening of the housing 1, and a dressing layer 5 is provided outside the isolation net 12. To reduce the space of the inner cavity 10 of the housing 1, the housing 1 is wrapped around the screw 4 to form an irregular inner cavity 10. To better fit the wound surface, the isolation net 12 is designed as a flat structure, but the isolation net 12 has a certain elasticity and can change its shape according to actual needs. A shaft sleeve 34 is provided on the housing 1 to match the rotating shaft 41. The shaft sleeve 34 is made of a material with a low coefficient of friction, so that the rotation resistance of the rotating shaft 41 can be reduced. The shaft sleeve 34 adopts an inner and outer double-layer structure. The inner layer is fixed on the rotating shaft 41, and the outer layer is fixed in the mounting hole of the housing 1. If further resistance reduction is required, a roller bearing or a ball bearing can be used to replace the shaft sleeve 34.

[0031] As Figure 3 , Figure 4 and Figure 5 shown, in an implementable manner, the housing 1 is provided with a first flushing channel 13 and a second flushing channel 14. The first flushing channel 13 is communicated with the inner cavity 10, and the second outlet 15 of the second flushing channel 14 is located between the isolation net 12 and the dressing layer 5.

[0032] As Figure 5 and Figure 6 shown, in one implementable embodiment, the first outlet 16 of the first flushing channel 13 is provided with a plurality of them and the first outlet 16 is located at the lower side between two adjacent screws 4. The first outlet 16 includes a left outlet 17, a middle outlet 18 and a right outlet 19. The left outlet 17 is located between the first screw 46 and the second screw 47, the middle outlet 18 is located between the second screw 47 and the third screw 48, and the right outlet 19 is located between the third screw 48 and the fourth screw 49. Below the screw 4 is the wound surface position, so it is necessary to focus on cleaning. The left outlet 17, the middle outlet 18 and the right outlet 19 are connected to different independent control pipes, and can be flushed simultaneously or selectively according to the situation.

[0033] As Figure 5 and Figure 6 shown, the sterile water entering the first flushing channel 13 from the flushing pipe 3, a part of it can move linearly along the axial direction of the screw 4 in the gap between the screws 4, and a part of it can move forward helically following the rotating screw 4, and can also move slowly linearly when the flow rate is slow. A second outlet 15 is arranged below the first outlet 16, and 3 second outlets 15 can also be arranged. Since the second outlet 15 provides flushing liquid for the dressing layer 5, the second outlet 15 must be designed in a flat shape, so that the flushing at the edge position is more sufficient.

[0034] As Figure 3 and Figure 4 shown, in one implementable embodiment, the housing 1 includes a first inner cavity 101 and a second inner cavity 102. The spiral blade 42 is located in the first inner cavity 101, the rotating shaft 41 passes through the first inner cavity 101 to reach the second inner cavity 102, and the gear 50 is arranged in the second inner cavity 102. Although the first inner cavity 101 and the second inner cavity 102 are independently arranged, in order to reduce the resistance of the rotation of the rotating shaft 41, there is a large gap at the installation position of the rotating shaft 41. Therefore, part of the fluid will enter the second inner cavity 102, and the amount of fluid entering the second inner cavity 102 can also be reduced when the negative pressure is turned on in the drainage pipe 2.

[0035] As Figure 3 、 Figure 4 and Figure 8As shown, in an implementable embodiment, the housing 1 is mounted on the drive shaft 7 in a rotatable and axially movable manner. The housing 1 is made of silicone material and has elasticity. Therefore, a through hole can be directly provided in the housing 1 to mount the drive shaft 7. The drive shaft 7 is located in the axial direction of the rotating shaft 41. The axial movement of the drive shaft 7 can be inserted into or separated from the rotating shaft 41. One end of the drive shaft 7 is provided with an internal hexagonal hole 71, and the other end is provided with a hexagonal protrusion 72 that matches the hexagonal hole 40 provided at the rear end of the rotating shaft 41, so that when the hexagonal protrusion 72 is inserted into the hexagonal hole 40, it can rotate synchronously, and when taken out, it is not linked, which is equivalent to a clutch, and can reduce the rotational resistance of the rotating shaft 41. In addition, a larger clearance fit can be adopted between the rotating shaft 41 and the housing 1 to make the rotational resistance smaller, while a tight fit is adopted between the drive shaft 7 and the housing 1 to avoid leakage. There may be some fluid in the second inner cavity 102, which can be discharged regularly through the installation position of the drive shaft 7. When there is less fluid in the second inner cavity 102, it basically does not affect the use.

[0036] As Figure 9 shown, the bottom of the housing 1 is provided with a plurality of exhaust grooves 8 arranged horizontally and vertically. The housing 1 is relatively thick and the air permeability is poor. Therefore, the air permeability needs to be considered for the contact at non-wound positions, and the dressing layer 5 needs to consider the moisturizing effect. Therefore, an annular sealing adhesive ring 9 needs to be provided on the housing 1. The sealing adhesive ring 9 surrounds the outer periphery of the dressing layer 5. In this way, when the adhesive ring is adhered to the skin, a closed inner cavity 10 can be formed, and the adhesive layer 6 can further improve the sealing performance.

[0037] As Figure 1 shown, when the negative pressure drainage device is adhered according to the upper, lower, left, right, front, and rear directions in the figure, there may be some accumulated water inside the housing 1. For some patients, it may cause adverse consequences. Therefore, an electric tool can be used to drive the drive shaft 7 to rotate at a high speed, so that most of the accumulated water in the inner cavity 10 can be cleaned. The existing electric screwdriver can be used to match the drive of the internal hexagonal hole 71, and there is no need to design an electric tool separately.

[0038] Embodiment 2: As Figure 10 and Figure 11 shown, the difference between this embodiment and Embodiment 1 is that the second end 44 of the screw 4 is provided with a water wheel blade 74. The water wheel blade 74 adopts a spiral design with a certain spiral lift angle and bending arc and the spiral direction is the same as that of the screw 4. In this way, the axially moving water flow can drive the screw 4 to rotate. In Embodiment 1, the water flow in the axial and radial directions is used to drive the screw 4. The water wheel blade 74 is provided with a plurality of circumferentially distributed on the rotating shaft 41. Since the spiral directions are the same, the rotating directions of the screws 4 are also the same. If linkage is to be achieved, transmission wheels 51 need to be provided on the gears 50 of adjacent screws 4 to ensure the same rotation direction of the screws 4. In addition, to ensure the stability of the drive, the water wheel blades 74 are arranged on the rotating shaft 41 along a plurality of spiral lines.

[0039] AsFigure 11 As shown, during actual use, when the first end 43 of the screw 4 is located above or obliquely above the second end 44 of the screw 4, the sterile water entering the flushing tube 3 can reach the second end 44 of the screw 4, and the flushing effect is better under the action of gravity. In addition, when the inlet 20 of the drainage tube 2 is located at the lower end, the liquid can be discharged from the inner cavity 10 faster. The inner cavity 10 can ensure an appropriate humidity. For some special cases where dryness needs to be maintained, sterile air can be introduced to drain the accumulated water as much as possible. For the convenience of observation, the screw 4 is also made of transparent polycarbonate. The spiral blade 42 and the water wheel blade 74 are integrally formed, so that the situation of the inner cavity 10 can be observed more intuitively. For those with light-shielding requirements, a light-shielding layer can be separately set outside. The drive shaft 7 is connected to the electric drive device 73. The negative pressure drainage device can be used once as a consumable, while the electric drive device 73 can be reused repeatedly, so that a better cleaning effect can be obtained.

[0040] Example 3: As Figure 12 shown, the screw 4 is arranged along an arc-shaped curved surface, so that it can be used on an arc-shaped wound surface. The housing 1 is made of silicone material and also has the ability of certain elastic deformation, and can be bent into different shapes to match different positions. To ensure that the screw 4 and the arc-shaped blade 45 on the screw can rotate smoothly, steel sheets 75 or other materials with stronger rigidity are embedded in the housing 1, so that the housing 1 has better support performance in the axial direction. When treating basic infections of the respiratory tract, such as diseases of the lungs, intubation may be required when the blood oxygen concentration is low. The wound of intubation is in the neck, and this position is a curved surface. It needs to be bent to a certain extent to better match the intubation position. After the intubation position is infected, pus or sputum will flow out and need to be cleaned in time. Since the flexible and bendable housing 1 is used, the rotation resistance of the screw 4 may be relatively large. Therefore, an electric drive device 73 needs to be used to ensure the stable rotation of the screw 4.

[0041] It should be understood that various forms of processes shown above can be used, and steps can be reordered, added or deleted. For example, the steps described in this application can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of this application can be achieved, and no limitation is made herein.

[0042] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of this application, "a plurality" means two or more. The upper, lower, left, right, front and rear are relative orientations and can be adjusted according to the actual situation during actual use, unless otherwise clearly and specifically defined.

[0043] As described above, it is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims described above.

Claims

1. A negative pressure drainage device, characterized in that, It includes a housing (1), a drainage tube (2), a flushing tube (3) and a screw (4). An opening is provided at the bottom of the housing (1) to form a semi-closed inner cavity (10). The screw (4) includes a rotating shaft (41) and a spiral blade (42). The screw (4) is installed in the inner cavity (10) through the rotating shaft (41) so that the screw (4) can rotate relative to the housing (1). The flushing tube (3) is located at the first end (43) of the screw (4), and the drainage tube (2) is located at the second end (44) of the screw (4). The fluid entering the inner cavity (10) from the flushing tube (3) reaches the second end (44) of the screw (4) after passing through the first end (43) of the screw (4) and is then transferred from the drainage tube (2).

2. The negative pressure drainage device according to claim 1, wherein, A dressing layer (5) is provided at the opening of the housing (1), and the housing (1) is provided with an adhesive layer (6) so that the housing (1) is fixed to the wound through the adhesive layer (6).

3. The negative pressure drainage device according to claim 1, wherein, A water wheel blade (74) is provided at the second end (44) of the screw (4). The water wheel blade (74) adopts a spiral design and the spiral direction is the same as that of the screw (4). A plurality of the water wheel blades (74) are circumferentially distributed on the rotating shaft (41).

4. The negative pressure drainage device according to claim 1, wherein An arc blade (45) is provided at the second end (44) of the screw (4). A plurality of the arc blades (45) are circumferentially distributed on the rotating shaft (41). The inlet (20) of the drainage tube (2) is located on the radial direction of the arc blade (45) and on the upper side of the arc blade (45).

5. The negative pressure drainage device according to any one of claims 1-4, characterized in that, The screw (4) includes a first screw (46), a second screw (47), a third screw (48) and a fourth screw (49). The first screw (46) and the second screw (47) are adjacent and have opposite spiral directions. The third screw (48) and the fourth screw (49) are adjacent and have opposite spiral directions. The third screw (48) and the second screw (47) are adjacent and have opposite spiral directions. A gear (50) is provided on the rotating shaft (41) so that the adjacent screws (4) are driven through the gear (50) and have opposite rotation directions.

6. The negative pressure drainage device according to claim 5, wherein An isolation net (12) is provided at the opening of the housing (1), and a dressing layer (5) is provided outside the isolation net (12).

7. The negative pressure drainage device according to claim 6, characterized in that, The housing (1) is provided with a first flushing channel (13) and a second flushing channel (14). The first flushing channel (13) is communicated with the inner cavity (10), and the second outlet (15) of the second flushing channel (14) is located between the isolation net (12) and the dressing layer (5).

8. The negative pressure drainage device according to claim 7, characterized in that, There are a plurality of first outlets (16) of the first flushing channel (13), and the first outlets (16) are located on the lower side between two adjacent screws (4).

9. The negative pressure drainage device according to claim 8, characterized in that, The housing (1) includes a first inner cavity (101) and a second inner cavity (102). The spiral blade (42) is located in the first inner cavity (101), a partial structure of the rotating shaft (41) is located in the first inner cavity (101), a partial structure of the rotating shaft (41) is located in the second inner cavity (102), and the gear (50) is arranged in the second inner cavity (102).

10. The negative pressure drainage device according to claim 9, characterized in that, The housing (1) is mounted on the drive shaft (7) in a rotatable and axially movable manner. The drive shaft (7) is located axially of the rotating shaft (41), and the axial movement of the drive shaft (7) can be inserted into or separated from the rotating shaft (41).

Images