Pressure-controllable wound drainage device

Abstract

The utility model discloses a pressure controllable wound drainage device which comprises a drainage tube and further comprises a negative pressure generator, a pressure adjusting device and a three-way valve, the pressure adjusting device is arranged in the negative pressure generator, and pressure generated in the negative pressure generator is controllably adjusted through the pressure adjusting device. One end of the three-way valve is detachably arranged on the negative pressure generator through threads, the other end of the three-way valve is connected with the drainage tube, and the tightness of the drainage tube on the three-way valve is adjustable. The drainage device has the advantages that the spiral connector on the three-way valve is connected with the air guide tube and the drainage tube, connection is tighter, meanwhile, different control effects can be conveniently achieved, a plastic exhaust port of an original drainage device is omitted, repeated pulling and inserting of the plastic exhaust port are avoided, the infection opportunity is reduced, iatrogenic cross infection is completely eradicated, and drainage liquid backflow during pressure adjustment is prevented; the pressure adjusting device is used for adjusting the internal pressure of the negative pressure generator, different pressures in the negative pressure generator are controlled through a multi-gear structure of the pressure adjusting device, and different suction effects are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates specifically to a pressure controllable wound drainage device. BACKGROUND

[0002] In the medical clinical treatment field, the negative pressure drainage device is mainly used for draining liquid, blood and pus to help patients to remove the accumulated waste and inflammatory substances in the body, remove postoperative congestion and exudate, reduce the risk of wound infection and promote wound healing and repair.

[0003] The existing negative pressure drainage device is composed of a plastic joint, an exhaust port and a spring type negative pressure generator. The drainage tube is connected with the negative pressure drainage device through the plastic joint to form a negative pressure environment, which promotes the flow of drainage liquid into the negative pressure drainage device. When it is necessary to adjust the internal pressure of the negative pressure drainage device, the sealing plug on the exhaust port of the negative pressure drainage device is pulled out and then the negative pressure drainage device is pressed, and then the sealing plug is inserted into the exhaust port to complete the adjustment of the internal pressure of the negative pressure drainage device, so as to ensure the smooth progress of the drainage process. This structure can achieve the use effect, but there are the following problems in the use process.

[0004] Problem 1: The conventional negative pressure drainage device needs to use the exhaust port to adjust the internal pressure of the drainage device. The adjustment of the pressure size can only rely on the experience judgment of the staff. The exhaust port is frequently pulled out during clinical observation and pouring of the drainage liquid, which is easy to cause the pressure to be not constant and the reverse flow of the drainage liquid to cause reverse infection.

[0005] Problem 2: There is a lack of thread device between the joint on the negative pressure drainage device and the drainage tube. The connection is not firm and is easy to fall off. When the pressure of the negative pressure drainage device is adjusted, the drainage liquid is easy to be sprayed out from the joint, which pollutes the bedclothes, bedding, clothes of the patient, the face, hands and clothes of the medical staff, and causes medical cross infection.

[0006] In Chinese patent: 201920985128.6, named: negative pressure drainage device, it is recorded that it includes a cavity, and its characteristics are that it further includes: a first interface and a second interface fixed on the upper cover of the cavity, the inner surface of the first interface and the second interface is provided with a built-in thread; a first joint with a first port and a second port, the outer surface of the first port is provided with an external thread matched with the built-in thread of the first interface, and the second port is detachably or fixedly connected with a drainage tube; a second joint with a third port, the outer surface of the third port is provided with an external thread matched with the built-in thread of the second interface.

[0007] As shown in the drawings of patent 201920985128.6, the technical scheme adopts the structure that two threaded interfaces are installed on the upper cover of the negative pressure drainage device chamber, the interfaces prevent the interface of the negative pressure drainage device from falling off during use, a pipe clamp is installed at each interface, and the pipe clamp is used to clamp the drainage tube when the drainage is paused to prevent backflow. The patent can achieve the effects of preventing falling off and backflow, but the use is relatively complex, backflow may occur when the pipe clamp is not clamped to the drainage tube, and the pressure adjustment of the negative pressure drainage device is still a traditional method, which is inconvenient to adjust. Utility model content

[0008] The technical problem to be solved by the utility model is the inconvenience of adjusting the pressure of the negative pressure in the existing wound negative pressure drainage device and the problem that the drainage liquid is easily exposed from the interface when the pressure is adjusted.

[0009] In view of the above technical problems, a pressure-controllable wound drainage device is provided; the technical scheme is realized as follows: a pressure-controllable wound drainage device, comprising a drainage tube for wound drainage, one end of the drainage tube being connected with a wound of a patient and the other end being connected with the pressure-controllable wound drainage device, characterized in that: a negative pressure generator, a pressure adjusting device and a three-way valve are further included, the pressure adjusting device being arranged in the negative pressure generator, the pressure generated in the negative pressure generator being controllable and adjustable through the pressure adjusting device, one end of the three-way valve being detachably arranged on the negative pressure generator through a thread and the other end being connected with the drainage tube, and the tightness of the drainage tube on the three-way valve being adjustable.

[0010] The utility model technical scheme is preferably selected as follows: the negative pressure generator comprises an upper cover, a compression air bag and a base, two ends of the compression air bag are connected with the upper cover and the base respectively, air in the compression air bag can be discharged by pressing the compression air bag to generate negative pressure in the compression air bag, and the compression air bag is arranged to facilitate generation of negative pressure by pressing the compression air bag, which is convenient to use.

[0011] The utility model technical scheme is preferably selected as follows: a gas guide pipe and a guide pipe are arranged on the upper cover, the gas guide pipe is connected with the drainage tube through the three-way valve, the guide pipe is arranged on the upper cover and communicates with the inside of the negative pressure generator, a pressure rod in the pressure adjusting device is arranged in the guide pipe, the gas guide pipe is arranged to facilitate connection with the three-way valve and the drainage tube, and the negative pressure generator is convenient to use to suck drainage liquid.

[0012] The utility model technical scheme is preferably selected as follows: a compression spring is arranged in the compression air bag, one end of the compression spring is connected with the upper cover and the other end is connected with the base, the compression spring is arranged to facilitate resetting of the negative pressure generator after pressing, generation of negative pressure and suction of drainage liquid, which is convenient to use.

[0013] The utility model discloses a pressure regulating device, which is characterized in that the pressure regulating device comprises a pressure rod, a first sleeve and a second sleeve, the first sleeve and the second sleeve are connected, the second sleeve is fixed on a base in a negative pressure generator, the pressure rod is inserted into the first sleeve, and the pressure rod can be moved in the first sleeve and the second sleeve by pressing the negative pressure generator.

[0014] The utility model discloses a pressure regulating device, which is characterized in that the pressure rod comprises a guide table and a plurality of guide blocks, the guide blocks are arranged on the outer side surface of the guide table, and the guide blocks can be matched with grooves in the first sleeve and the second sleeve and moved along the groove profile in the first sleeve and the second sleeve.

[0015] The utility model discloses a pressure regulating device, which is characterized in that a plurality of guide grooves are arranged on the inner side surface of the first sleeve, the guide blocks on the pressure rod can be moved in the guide grooves, a half-pressure limiting groove and a full-pressure limiting groove are arranged on the inner side surface of the second sleeve, the half-pressure limiting groove is arranged at the end of the second sleeve, the negative pressure generator can only be compressed by half when the pressure rod is matched with the half-pressure limiting groove, half negative pressure is generated, and the full-pressure limiting groove penetrates through the second sleeve.

[0016] The utility model discloses a pressure regulating device, which is characterized in that a plurality of guide grooves are arranged on the inner side surface of the first sleeve, the guide blocks on the pressure rod can be moved in the guide grooves, a half-pressure limiting groove and a full-pressure limiting groove are arranged on the inner side surface of the second sleeve, the half-pressure limiting groove is arranged at the end of the second sleeve, the negative pressure generator can only be compressed by half when the pressure rod is matched with the half-pressure limiting groove, half negative pressure is generated, and the full-pressure limiting groove penetrates through the second sleeve.

[0017] The utility model discloses a pressure regulating device, which is characterized in that a plurality of guide grooves are arranged on the inner side surface of the first sleeve, the guide blocks on the pressure rod can be moved in the guide grooves, a half-pressure limiting groove and a full-pressure limiting groove are arranged on the inner side surface of the second sleeve, the half-pressure limiting groove is arranged at the end of the second sleeve, the negative pressure generator can only be compressed by half when the pressure rod is matched with the half-pressure limiting groove, half negative pressure is generated, and the full-pressure limiting groove penetrates through the second sleeve.

[0018] The utility model discloses a pressure regulating device, which is characterized in that a plurality of guide grooves are arranged on the inner side surface of the first sleeve, the guide blocks on the pressure rod can be moved in the guide grooves, a half-pressure limiting groove and a full-pressure limiting groove are arranged on the inner side surface of the second sleeve, the half-pressure limiting groove is arranged at the end of the second sleeve, the negative pressure generator can only be compressed by half when the pressure rod is matched with the half-pressure limiting groove, half negative pressure is generated, and the full-pressure limiting groove penetrates through the second sleeve.

[0019] The technical solution of this utility model utilizes the structure of a three-way valve, which connects to the drainage tube and the air guide tube on the negative pressure generator respectively. The three-way valve also utilizes a spiral interface to connect to both the air guide tube and the drainage tube, resulting in a tighter connection that is less prone to detachment. This also facilitates different control effects by controlling the opening and closing of the three-way valve, simplifying operation. It eliminates the need for repeated insertion and removal of the original plastic exhaust port on the drainage device, reducing the chance of infection and preventing iatrogenic cross-infection. It also prevents backflow of drainage fluid during pressure adjustment. Furthermore, a pressure adjustment device located within the negative pressure drainage device adjusts the internal pressure of the negative pressure generator. Through the multi-stage structure of the pressure adjustment device, different pressures within the negative pressure generator can be controlled to achieve different suction effects, making it convenient to use. Attached Figure Description

[0020] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0021] Figure 2 This is a partial sectional view of the pressure regulating device;

[0022] Figure 3 for Figure 2 Explosion diagram;

[0023] Figure 4 This is a partial cross-sectional view of the pressure regulating device under half-pressure conditions;

[0024] Figure 5 This is a partial sectional view of the pressure regulating device under full pressure.

[0025] Figure 6 This is a partial sectional view of the present invention;

[0026] Figure 7 for Figure 6 Enlarged view of point A in the middle;

[0027] Figure 8 This is an exploded view of the present invention;

[0028] Explanation of reference numerals in the attached diagram: 1-Negative pressure generator, 11-Top cover, 12-Compressed air bladder, 13-Base, 14-Air guide tube, 15-Guide sleeve, 16-Scale, 17-Compression spring, 2-Pressure regulating device, 21-Pressure rod, 22-First sleeve, 23-Second sleeve, 24-Guide platform, 25-Guide block, 26-Guide groove, 27-Half-pressure limiting groove, 28-Full-pressure limiting groove, 29-Sealing sleeve, 3-Three-way valve, 31-Port 1, 32-Port 2, 33-Port 3, 34-Drainage tube mounting head, 35-Fixing nut, 4-Drainage tube. Detailed Implementation

[0029] The following will refer to the appendix in the embodiments of this utility model. Figures 1-8The technical scheme in the embodiment of the utility model is described in detail. Embodiment

[0030] As Figure 1 , 6 and 8, a pressure-controllable wound drainage device, comprising a negative pressure generator 1, a pressure regulating device 2, a three-way valve 3 and a drainage tube 4, the pressure regulating device 2 is arranged in the negative pressure generator 1, the pressure of the negative pressure in the negative pressure generator 1 can be adjusted through the pressure regulating device 2, the three-way valve 3 is screwed on the upper cover 14 of the negative pressure generator 1, the negative pressure generator 1 is communicated with the outside through the three-way valve 3, the drainage tube 4 for drainage is installed on the three-way valve 3, and the three-way valve 3 can control the connection of the drainage tube 4 and the negative pressure generator 1.

[0031] The main function of the negative pressure generator 1 is to generate negative pressure, the drainage tube 4 connected with the wound of the patient is connected with the negative pressure generator 1, and the negative pressure generated by the negative pressure generator 1 and the drainage tube 4 attract and drain body fluid, blood or pus.

[0032] The main function of the pressure regulating device 2 is to adjust the suction pressure of the negative pressure generator 1, the pressure regulating device 2 has multi-grade adjustment function, one grade is no negative pressure, the negative pressure generator 1 does not generate negative pressure in the no negative pressure state, and has no suction capacity, two grades are half negative pressure, the negative pressure generator 1 has negative pressure suction capacity in the half negative pressure state, three grades are full negative pressure, the negative pressure suction force of the negative pressure generator 1 is strongest in the full negative pressure state, and the suction force of the half negative pressure is half of that of the full negative pressure.

[0033] The main function of the three-way valve 3 is to connect the drainage tube 4 and the negative pressure generator 1, and the structure of the three-way valve 3 also facilitates adjustment of the pressure of the negative pressure generator 1, the exhaust port on the traditional negative pressure generator is cancelled, the switch on the three-way valve 3 is adjusted, the negative pressure suction of the negative pressure generator 1 or the exhaust communication with the outside can be controlled, in addition, the threaded interface arranged on the three-way valve 3 also improves the stability of connection, ensures the stability of the connection between the drainage tube 4 and the negative pressure generator 1, and prevents the drainage tube 4 from falling off in the use process.

[0034] The drainage tube 4 is an existing device, the main function of the drainage tube 4 is to be connected with the negative pressure generator 1, as a channel for attracting and draining body fluid, blood or pus, and the drainage tube 4 is an existing device and can be directly used.

[0035] As Figure 1 , 6 and 8, the negative pressure generator 1 comprises an upper cover 11, a compression air bag 12 and a base 13, the two ends of the compression air bag 12 are connected with the upper cover 11 and the base 13 respectively, and pressing the upper cover 11 can drive the compression air bag 12 to be forced to compress.

[0036] The top cover 11 is a circular plastic cover with a certain thickness and strength. In order to facilitate the installation of the three-way valve 3, a circular through hole is opened on the surface of the top cover 11 perpendicular to the top cover. A circular tube protrudes outward from this circular through hole on the top cover 11. This tube is named the air guide tube 14. An external thread is opened on the side of the end of the air guide tube 14. The air guide tube 14 is connected to the three-way valve 3 through the external thread.

[0037] To facilitate the installation of the pressure rod 21 in the pressure regulating device 2, a circular tube with a closed end protrudes perpendicularly outward from the surface of the upper cover 11. This tube is named the guide sleeve 15. The inner diameter of the guide sleeve 15 is slightly larger than the outer diameter of the first sleeve 22 in the pressure regulating device 2. The guide sleeve 15 and the air guide tube 14 are both set on the same surface of the upper cover 11. The pressure rod 21 in the pressure regulating device 2 is installed inside the guide sleeve 15.

[0038] The base 13 is used to seal the compressed airbag 12. The base 13 is made of plastic with a certain strength and its size is slightly larger than that of the compressed airbag 12.

[0039] The compression airbag 12 is an annular cylinder with open ends, made of a flexible transparent plastic film of a certain thickness. One end of the compression airbag 12 is fixed to the top cover 11 by heat pressing, and the lower end of the compression airbag 12 is fixed to the base 13 by heat pressing, forming a closed cavity that is connected to the outside through the air guide tube 14. When the compression airbag 12 is pressed, the air inside the compression airbag 12 is discharged to the outside through the air guide tube 14.

[0040] After the airbag 12 is pressed, a compression spring 17 is fixed inside the airbag 12 to facilitate the negative pressure generated by the airbag 12's reset. One end of the compression spring 17 is fixed to the upper cover 11, and the other end is fixed to the base 13. After the airbag 12 is pressed, the compression spring 17 is subjected to force. After the press is released, the airbag 12 resets under the action of the compression spring 17. During the reset process, the airbag 12 applies suction to the outside through the air duct 14, thereby generating negative pressure.

[0041] To facilitate real-time monitoring of the volume of the drainage fluid, a scale 16 is printed on the outer surface of the compression bladder 12, through which the amount of drainage fluid can be accurately determined.

[0042] like Figure 2 , 3 As shown in Figures 4, 5, 6 and 8, the pressure regulating device 2 includes a pressure rod 21, a first sleeve 22 and a second sleeve 23. One end of the pressure rod 21 is fixed inside the guide sleeve 15, and the other end is inserted into the first sleeve 22. One end of the first sleeve 22 is connected to one end of the second sleeve 23, and the other end of the second sleeve 23 is fixed on the base 13.

[0043] The pressing rod 21 comprises a cylindrical rod body and a guide platform 24 fixed at one end of the rod body, and the whole pressing rod 21 is made of plastic. The rod body is a cylindrical rod, one end of the rod body is fixed on the top end wall of the guide sleeve 15, and the other end is fixed with a circular guide platform 24. The guide platform 24 is a circular platform with a certain thickness, and the outer diameter of the guide platform 24 is slightly smaller than the inner diameter of the first sleeve 22. The guide platform 24 can be inserted into and moved in the first sleeve 22.

[0044] Regarding the fixing of the pressing rod 21 on the guide sleeve 15, the pressing rod 21 is fixed on the upper end face inside the guide sleeve 15 through a bearing (not shown in the figure). The inner ring of the bearing is fixedly connected with the rod body, and the outer ring of the bearing is connected with the guide sleeve 15 through glue. The pressing rod 21 can rotate freely relative to the upper cover 11 through the bearing, and at the same time, when the upper cover 11 is pressed to compress the compression air bag 12, the pressing rod 21 can also move with the upper cover 11.

[0045] In order to limit the movement of the pressing rod 21 in the first sleeve 22, a plurality of guide blocks 25 are fixed on the arc surface of the guide platform 24 along the radial direction of the guide platform 24. The pressing rod 21 moves along the guide groove 26 in the first sleeve 22 through the guide blocks 25.

[0046] The guide block 25 is a rectangular block with a parallelogram cross section, and two inclined surfaces in the guide block 25 are divided into upper and lower parts.

[0047] Definition: In this embodiment, taking the negative pressure generator 1 as the reference, the direction from the base 13 to the upper cover 11 is upward, and the direction from the upper cover 11 to the base 13 is downward.

[0048] The first sleeve 22 is a cylindrical tube made of plastic, and the two ends of the first sleeve 22 are not closed. In order to facilitate the sliding of the pressing rod 21 along the first sleeve 22, a rectangular groove is recessed vertically on the inner wall of the first sleeve 22, which is named as the guide groove 26. The guide grooves 26 are uniformly distributed in the first sleeve 22, and the number of the guide grooves 26 is half of the number of the guide blocks 25.

[0049] In order to facilitate the control of the axial angle of the pressing rod 21 relative to the first sleeve 22, the end of the guide groove 26 at the lower end of the first sleeve 22 is provided with a cutting angle which can cooperate with the inclined angle on the guide block 25. Through the cooperation of the cutting angle and the inclined angle on the guide block 25, the pressing rod 21 can be rotated to complete the adjustment of the axial angle, which facilitates the adjustment of the negative pressure gear.

[0050] The second sleeve 23 is the same as the first sleeve 22, and both are cylindrical tubes made of plastic. The two ends of the second sleeve 23 are not closed. The difference between the second sleeve 23 and the first sleeve 22 is that the shapes of the recesses opened in the second sleeve 23 and the first sleeve 22 are different.

[0051] The diameter and inner diameter of the second sleeve 23 are same as the first sleeve 22, the pressure rod 21 passes through the first sleeve 22 and enters the second sleeve 23, moves along the limiting groove in the second sleeve 23, the length of the second sleeve 23 is slightly larger than the length of the first sleeve 22, the sum of the length of the second sleeve 23 and the length of the first sleeve 22 is same as the distance between the upper cover 11 and the base 13, the lower end of the second sleeve 23 is fixed on the base 13 by glue, and the position of the second sleeve 23 corresponds to the upper and lower guide sleeves 15.

[0052] The second sleeve 23 includes a half-pressing limiting groove 27 and a full-pressing limiting groove 28, one half-pressing limiting groove 27 and one full-pressing limiting groove 28 form a set of limiting grooves, a plurality of such limiting grooves are uniformly spaced on the inner wall of the second sleeve 23, and the number of the guide grooves 26 in the first sleeve 22 is same as the sum of the number of the half-pressing limiting grooves 27 and the full-pressing limiting grooves 28, the depth of the insertion of the pressure rod 21 in the second sleeve 23 can be limited by the half-pressing limiting grooves 27 and the full-pressing limiting grooves 28, thereby controlling the compression degree of the compression air bag 12, so as to realize the adjustment of the negative pressure of the negative pressure generator 1.

[0053] The half-pressing limiting groove 27 is a rectangular groove, the half-pressing limiting groove 27 is arranged on the inner wall of the second sleeve 23 close to the upper port 2, the length of the half-pressing limiting groove 27 is same as the length of the guide block 25, that is, when the guide block 25 on the pressure rod 21 moves to the half-pressing limiting groove 27, the guide block 25 is limited by the half-pressing limiting groove 27, the pressure rod 21 cannot move downward any more, at this time, the negative pressure generator 1 can only be compressed by half, at this time, the negative pressure in the negative pressure generator 1 is half of the fully compressed negative pressure, which is a two-gear half-negative pressure.

[0054] The full-pressing limiting groove 28 is a rectangular groove, the full-pressing limiting groove 28 penetrates through the second sleeve 23, when the guide block 25 on the pressure rod 21 moves to the full-pressing limiting groove 28, the full-pressing limiting groove 28 guides the pressure rod 21 to move downward until the negative pressure generator 1 is fully compressed, which is a one-gear full-negative pressure, at this time, the suction force of the negative pressure generator 1 is the largest.

[0055] In order to facilitate the pressure adjusting device 2 to adjust the gear and realize the conversion between the half-negative pressure and the full-negative pressure, an inclined chamfer is made at the upper end of the half-pressing limiting groove 27 and the full-pressing limiting groove 28, the chamfer is parallel to the inclined surface of the guide block 25, through the cooperation of the chamfer and the inclined surface of the guide block 25, the axial angle of the pressure rod 21 can be adjusted.

[0056] In order to facilitate the movement of the pressure rod 21 in the first sleeve 22 and the second sleeve 23, the lower end of the first sleeve 22 and the upper end of the second sleeve 23 are connected together by glue, and the guide groove 26 in the first sleeve 22 and the half-pressure limiting groove 27 and the full-pressure limiting groove 28 in the second sleeve 23 overlap each other by half in the vertical direction. After the pressure rod 21 moves to the end of the first sleeve 22 along the guide groove 26, it is rotated by the cut angle at the end of the half-pressure limiting groove 27 or the full-pressure limiting groove 28 and then slides into the half-pressure limiting groove 27 or the full-pressure limiting groove 28, thereby achieving the adjustment of the half negative pressure or the full negative pressure.

[0057] In addition, in order to facilitate the rotation of the pressure rod 21 at the lower end of the first sleeve 22, an annular groove is recessed vertically on the inner side of the lower end of the first sleeve 22, the annular groove is in communication with the outside of the lower end of the first sleeve 22, and the inner diameter of the annular groove is slightly larger than the outer diameter of the guide table 24 on which the guide block 25 is installed. The pressure rod 21 can rotate at this position.

[0058] In order to prevent the drainage liquid from entering the pressure regulating device 2, an annular sealing cover 29 made of a flexible film is provided outside the pressure regulating device 2. The sealing cover 29 is sleeved outside the first sleeve 22 and the second sleeve 23, the upper end of the sealing cover 29 is heat-pressed on the upper cover 11 and covers the outside of the opening of the guide sleeve 15, and the other end is heat-pressed on the surface of the base 13, thereby isolating the drainage liquid in the negative pressure generator 1 outside the pressure regulating device 2.

[0059] The use process of the pressure regulating device 2 is as follows: when it is needed to adjust the pressure regulating device 2 to semi-negative pressure, the upper cover 11 is pressed, the upper cover 11 moves downward to drive the pressure rod 21 to move downward, when the pressure rod 21 passes through the first sleeve 22, the inclined surface of the guide block 25 on the pressure rod 21 is matched with the bevel on the semi-pressure limiting groove 27 on the second sleeve 23, the two inclined surfaces are extruded, the pressure rod 21 is rotated, at this time, the guide block 25 on the pressure rod 21 is clamped in the semi-pressure limiting groove 27, at this time, the pressure rod 21 cannot continue to be pressed downward, at this time, it is in the semi-negative pressure state; when it is needed to adjust to full negative pressure in this state, the upper cover 11 is loosened, at this time, the upper cover 11 is reset under the action of the compression spring 17, and drives the pressure rod 21 to move upward, when the guide block 25 on the pressure rod 21 is moved out of the semi-pressure limiting groove 27, the inclined surface on the upper end of the guide block 25 is matched with the inclined surface at the end of the guide groove 26 to extrude, drives the pressure rod 21 to rotate to be aligned with the guide groove 26 on the first sleeve 22, and is slid into the guide groove 26, the guide groove 26 is adjacent to the guide groove 26 passed through in the first pressing, then the upper cover 11 is pressed again, the upper cover 11 moves downward to drive the pressure rod 21 to move downward, when the pressure rod 21 passes through the first sleeve 22, the inclined surface of the guide block 25 on the pressure rod 21 is matched with the bevel on the full-pressure limiting groove 28 on the second sleeve 23, the two inclined surfaces are extruded, the pressure rod 21 is rotated, at this time, the guide block 25 on the pressure rod 21 is clamped in the full-pressure limiting groove 28, at this time, the pressure rod 21 continues to be pressed downward along the full-pressure limiting groove 28 until the compression air bag 12 is completely extruded, at this time, it is in the full-negative pressure state; the pressure adjusting mode of the pressure regulating device 2 is similar to that of a press-type ball pen, the full-negative pressure and the semi-negative pressure are adjusted in cycles by continuously pressing, and when the pressure regulating device 2 is not pressed, it is in the non-negative pressure state, and the use is convenient.

[0060] As shown in Figure 1 , 6 , 7 and 8, the three-way valve 3 comprises three interfaces and a control knob, and the communication between the three interfaces can be controlled by the control knob.

[0061] In order to be distinguished, the three interfaces on the three-way valve 3 are respectively named as a first port 31, a second port 32 and a third port 33, wherein the first port 31 and the second port 32 correspond to each other, and the third port 33 is perpendicular to the first port 31 and the second port 32, wherein the first port 31 is connected with the negative pressure generator 1, the second port 32 is connected with the drainage tube 4, and the third port 33 is directly communicated with the outside for exhausting.

[0062] In order to facilitate the installation of the three-way valve 3, an internal thread is formed on the inner side wall of the first port 31, and the first port 31 can be screwed with the air guide pipe 14 to be connected stably and prevent from falling off.

[0063] In order to facilitate the connection of the three-way valve 3 and the drainage tube 4, a threaded section is formed on the surface of the second port 32, and a conical fixed nut 35 is screwed on the threaded section, and a circular tube is vertically protruded from the circular end surface of the second port 32, the outer diameter of the circular tube is smaller than the outer diameter of the second port 32, and the circular tube is named as the drainage tube mounting head 34, and the drainage tube 4 can be sleeved on the drainage tube mounting head 34 and communicated with the three-way valve 3.

[0064] The fixed nut 35 is a conical nut, the two ends of the fixed nut 35 are open, and an internal thread is formed on the inner wall of the fixed nut 35, the drainage tube 4 can be inserted into the fixed nut 35 from the end of the fixed nut 35 and connected to the drainage tube mounting head 34, because the fixed nut 35 is conical, when the fixed nut 35 is screwed, the interval between the inner wall of the end of the fixed nut 35 and the outer wall of the drainage tube mounting head 34 will become smaller, thereby extruding the drainage tube 4, ensuring the stability of the drainage tube, preventing the drainage tube 4 from falling off at the joint during use, and the fixed nut 35 is an existing device and can be directly used.

[0065] As for the control of the communication between the first port 31, the second port 32 and the third port 33 in the three-way valve 3, the three-way valve 3 is an existing double-control three-way valve, the double-control knob can control the communication between the first port 31 and the second port 32, and can also control the communication between the first port 31 and the third port 33, which is convenient to use.

[0066] The use process of the embodiment is as follows: when in use, the three-way valve 3 is closed first, then the fixed nut 35 on the second port 32 is unscrewed, the drainage tube 4 is installed on the drainage tube mounting head 34 through the fixed nut 35, then the fixed nut 35 is tightened, then the first port 31 and the third port 33 are connected and opened through the knob, at this time the second port 32 is closed, then the negative pressure generator 1 is pressed to adjust the negative pressure as needed, then the first port 31 and the second port 32 are connected through the knob, and the third port 33 is closed, so that the negative pressure suction can be carried out, which is convenient to use.

[0067] The above embodiments are only for illustrating the technical idea of the utility model, and cannot limit the protection scope of the utility model, any modification made on the basis of the technical scheme according to the technical idea of the utility model falls within the protection scope of the utility model.

Claims

1. A pressure-controllable wound drainage device, comprising a drainage tube (4) for wound drainage, one end of the drainage tube (4) being connected to a wound of a patient, the other end being connected to the pressure-controllable wound drainage device, characterized in that: The negative pressure generator (1), the pressure regulating device (2) and the three-way valve (3) are further included. The pressure regulating device (2) is arranged in the negative pressure generator (1), the pressure generated in the negative pressure generator (1) is controllable adjusted through the pressure regulating device (2), one end of the three-way valve (3) is detachably arranged on the negative pressure generator (1) through screw thread, and the other end is connected with the drainage tube (4). The tightness of the drainage tube (4) on the three-way valve (3) is adjustable.

2. A pressure-controllable wound drainage device according to claim 1, characterized in that: The negative pressure generator (1) includes an upper cover (11), a compression air bag (12) and a base (13). The two ends of the compression air bag (12) are connected with the upper cover (11) and the base (13) respectively. By pressing the compression air bag (12), the air in the compression air bag (12) can be discharged to generate negative pressure in the compression air bag (12).

3. A pressure-controllable wound drainage device according to claim 2, characterized in that: The air guide pipe (14) and the guide pipe (15) are arranged on the upper cover (11). The air guide pipe (14) is connected with the drainage tube (4) through the three-way valve (3). The guide pipe (15) is arranged on the upper cover (11) and communicates with the inside of the negative pressure generator (1). The pressure rod (21) in the pressure regulating device (2) is arranged in the guide pipe (15).

4. A pressure-controllable wound drainage device according to claim 2, characterized in that: The compression spring (17) is arranged in the compression air bag (12). One end of the compression spring (17) is connected with the upper cover (11), and the other end is connected with the base (13).

5. The pressure-controllable wound drainage device according to claim 1, characterized in that: The pressure regulating device (2) includes the pressure rod (21), a first sleeve (22) and a second sleeve (23). The first sleeve (22) and the second sleeve (23) are connected. The second sleeve (23) is fixed on the base (13) in the negative pressure generator (1). The pressure rod (21) is inserted in the first sleeve (22). The negative pressure generator (1) can drive the pressure rod (21) to move in the first sleeve (22) and the second sleeve (23).

6. A pressure-controllable wound drainage device according to claim 5, characterized in that: The pressure rod (21) includes a guide table (24) and a plurality of guide blocks (25). The guide blocks (25) are arranged on the outer side of the guide table (24). The guide blocks (25) can cooperate with the grooves in the first sleeve (22) and the second sleeve (23) and move along the groove profile in the first sleeve (22) and the second sleeve (23).

7. A pressure-controllable wound drainage device according to claim 5, characterized in that: A plurality of guide grooves (26) are arranged on the inner side of the first sleeve (22). The guide blocks (25) on the pressure rod (21) can move in the guide grooves (26). A half-pressure limiting groove (27) and a full-pressure limiting groove (28) are arranged on the inner side of the second sleeve (23). The half-pressure limiting groove (27) is arranged at the end of the second sleeve (23). When the pressure rod (21) cooperates with the half-pressure limiting groove (27), the negative pressure generator (1) can only be compressed by half to generate half negative pressure. The full-pressure limiting groove (28) penetrates the second sleeve (23). When the pressure rod (21) cooperates with the full-pressure limiting groove (28), the negative pressure generator (1) is fully compressed to generate full negative pressure.

8. The pressure-controlled wound drainage apparatus of claim 1, wherein: The three-way valve (3) comprises a first port (31), a second port (32) and a third port (33), the first port (31) and the second port (32) are provided with internal threads, the first port (31) is connected with the air guide pipe (14) on the upper cover (11) of the negative pressure generator (1), and the second port (32) is connected with the drainage tube (4).

9. A pressure-controllable wound drainage device according to claim 8, characterized in that: A drainage tube mounting head (34) and a fixing nut (35) for mounting the drainage tube (4) are arranged on the second port (32), the drainage tube (4) is sleeved on the drainage tube mounting head (34), the fixing nut (35) is screwed on the second port (32), and the drainage tube (4) is fixed on the drainage tube mounting head (34) by adjusting the fixing nut (35).

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