Negative pressure therapy system with automatic irrigation function

Abstract

The present invention discloses a negative pressure therapy system with automatic irrigation function, and the negative pressure therapy system includes: a peristaltic pump, a waste liquid tank, an electric valve, a vacuum pump, a pressure sensor and a main control unit. The main control unit is used to control the negative pressure therapy system to cycle in the first stage, the second stage, the second stage and the fourth stage in sequence; in the first stage, the electric valve is in the first state, and the vacuum pump is in the starting state; in the second stage, the electric valve is in the second state, and the vacuum pump stops working; in the third stage, the peristaltic pump is in the starting state; in the fourth stage, the peristaltic pump stops running, so that the perfusion liquid is soaked in the dressing for a second time. The negative pressure therapy system of the present application can absorb the liquid at the wound surface more thoroughly, and make the perfusion liquid infiltrate the wound surface more evenly.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to a negative pressure treatment system with an automatic irrigation function. Background Art

[0002] The negative pressure drainage system is used to control the contact and irrigation of the perfusion fluid on the wound surface. In traditional technology, the perfusion fluid is injected into the dressing after the negative pressure at the dressing is completely released. After the dressing is soaked in the perfusion fluid for a period of time, the perfusion fluid of the dressing is sucked into the waste liquid tank. However, since the dressing is generally made of hydrophobic PU material, there is no siphon effect on the perfusion fluid. Under the action of gravity, most of the perfusion fluid will gather in the lower part of the wound surface, and the higher part of the wound surface will hardly contact the perfusion fluid, resulting in poor irrigation effect and limited moisturizing effect of the perfusion fluid on the wound surface. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a negative pressure therapy system with an automatic irrigation function, which can absorb the liquid at the wound surface more thoroughly and make the irrigation liquid infiltrate the wound surface more evenly.

[0004] The negative pressure therapy system with automatic irrigation function according to the present invention comprises: a peristaltic pump, the peristaltic pump having a pump inlet and a pump outlet, the pump inlet being used to connect to a liquid source, and the pump outlet being used to connect to the wound dressing assembly; a waste liquid tank, the waste liquid tank being used to connect to the wound dressing assembly; an electric valve, the electric valve being used to connect between the waste liquid tank and the wound dressing assembly, the electric valve having a switchable first state and a switchable second state, the electric valve being used to connect the waste liquid tank and the wound dressing assembly in the first state, and being used to disconnect the waste liquid tank and the wound dressing assembly in the second state; a vacuum pump, the vacuum pump being connected to the waste liquid tank; a pressure sensor being used to detect the waste liquid tank and / or the wound dressing assembly. The pressure inside the component; a main control unit, the main control unit is communicatively connected with the peristaltic pump, the electric valve, and the vacuum pump, and the main control unit is used to control the negative pressure therapy system to cycle in the first stage, the second stage, the second stage, and the fourth stage in sequence; in the first stage, the electric valve is in a first state, and the vacuum pump is in a starting state, so that a negative pressure is generated in the wound dressing component and lasts for a first time; in the second stage, the electric valve is in a second state, and the vacuum pump stops working, so that a negative pressure environment is maintained in the wound dressing component; in the third stage, the peristaltic pump is in a starting state to deliver a certain amount of perfusion fluid to the wound dressing component; in the fourth stage, the peristaltic pump stops running, so that the perfusion fluid is soaked for a second time.

[0005] According to the negative pressure therapy system with automatic irrigation function of the present invention, the negative pressure therapy system is controlled by the main control unit to cycle through the first stage, the second stage, the second stage and the fourth stage, and the dressing can be switched between the compressed and expanded states by adjusting the negative pressure in the wound dressing assembly. In the process of compression of the dressing, the water absorption capacity of the dressing gradually weakens, which is conducive to the liquid in the dressing to be discharged from the dressing and flow into the waste liquid tank. At this time, the liquid at the wound surface can be more thoroughly attracted to the waste liquid tank, and less liquid remains at the wound surface. In the process of expansion of the dressing, the water absorption capacity of the dressing gradually increases, and the perfusion liquid flowing into the wound dressing assembly can evenly fill the dressing under the attraction generated by the expansion of the dressing. At this time, the perfusion liquid can evenly moisten the wound surface through the dressing.

[0006] In some embodiments, in the third stage and the fourth stage, the wound dressing assembly is in a negative pressure environment.

[0007] In some embodiments, the electric valve is a normally open solenoid valve.

[0008] In some embodiments, the main control unit includes a calculation module, which calculates the rotation speed of the vacuum pump by obtaining the pressure value detected by the pressure sensor when the wound oxygenation negative pressure therapy system is initially operated, and the vacuum pump operates according to the calculation result of the calculation module.

[0009] In some specific embodiments, the negative pressure therapy system with automatic irrigation function further includes a tube clamping valve, wherein the electric valve and the waste liquid tank are components of the tube clamping valve; the tube clamping valve includes: a mounting body, wherein a clamping surface is provided on the mounting body, wherein the waste liquid tank is connected to the wound dressing assembly via a drainage tube, wherein a section of the drainage tube is located on the clamping surface; the electric valve includes a valve body and a valve core, wherein the valve body is movably mounted on the mounting body, wherein the valve core is arranged opposite to the clamping surface, and wherein a portion of the drainage tube is located on the clamping surface. and the valve core, the valve core is movable between an extended position and a retracted position, the valve core is located in the retracted position when the electric valve is in a first state, and the valve core is located in the extended position when the electric valve is in a second state, when in the extended position, the valve core is close to the clamping surface to cut off the flow in the drainage tube, and when in the retracted position, the distance between the valve core and the clamping surface is greater than the distance between the valve core and the clamping surface when in the extended position; an elastomer, the elastomer is connected to the electric valve, and the elastomer is used to drive the electric valve to approach the clamping surface.

[0010] Furthermore, the mounting body includes: a mounting cover and the waste liquid tank, the mounting cover is connected to the waste liquid tank, and the electric valve is mounted on the mounting cover; wherein a groove for accommodating the drainage tube is defined between the waste liquid tank and the mounting cover, a portion of the inner wall of the groove constitutes the clamping surface, and one end of the drainage tube is connected to the waste liquid tank.

[0011] Specifically, the groove is arranged on a side of the waste liquid tank facing the installation cover, the valve body of the electric valve is located on a side of the installation cover away from the waste liquid tank, and a matching hole for passing the valve core is provided on the installation cover.

[0012] In some embodiments, the pinch valve further comprises at least one guide body, wherein the guide body is connected to the mounting body, and the electric valve cooperates with the guide body and moves along the guide body.

[0013] Specifically, the guide body is a guide column, and guide plates with guide holes are provided on opposite sides of the valve body. The guide column is installed on the mounting body corresponding to each guide hole, and the guide hole is sleeved on the guide body. The two ends of the elastic body are respectively connected to the guide column and the guide plate.

[0014] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0016] Figure 1 It is a structural schematic diagram of a negative pressure therapy system with automatic irrigation function according to an embodiment of the present invention when used in conjunction with a wound dressing assembly;

[0017] Figure 2 for Figure 1 A schematic structural diagram of a wound dressing assembly according to an embodiment;

[0018] Figure 3 An exploded view of a pinch valve of a negative pressure therapy system according to an embodiment of the present invention;

[0019] Figure 4 for Figure 3 A main side view of a pinch valve of an embodiment;

[0020] Figure 5 for Figure 3 A main side view of the pinch valve of the embodiment when the cover is hidden;

[0021] Figure 6 for Figure 3A schematic structural diagram of the pinch valve of the embodiment when the valve core is in the retracted position;

[0022] Figure 7 for Figure 3 A schematic structural diagram of the pinch valve of the embodiment when the valve core is in the extended position.

[0023] Reference numerals:

[0024] Negative pressure therapy system 100,

[0025] Wound 10,

[0026] Wound dressing assembly 11, working chamber 110, dressing 111, suction cup 112, sealant 113,

[0027] Perfusion tube 12, drainage tube 13, peristaltic pump 14, waste liquid tank 15,

[0028] Electric valve 16, valve body 161, valve core 162, guide plate 163,

[0029] Vacuum pump 17, pressure sensor 18, main control unit 19,

[0030] Pinch valve 20,

[0031] The mounting body 21, the clamping surface 210, the mounting cover 211, the groove 212, the matching hole 213, the protrusion 214,

[0032] Elastic body 22 and guide body 23. DETAILED DESCRIPTION

[0033] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0034] In the description of the present invention, it should be understood that the terms "horizontal", "bottom", "inside", "outside", "upper", "lower" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "second" or "secondary" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] The following describes a negative pressure therapy system 100 with automatic irrigation function according to an embodiment of the present invention with reference to the accompanying drawings.

[0037] like Figure 1 , Figure 2 As shown, the negative pressure therapy system 100 with automatic irrigation function according to an embodiment of the present invention includes: a peristaltic pump 14, a waste liquid tank 15, an electric valve 16, a vacuum pump 17, a pressure sensor 18 and a main control unit 19. The negative pressure therapy system 100 should be used in conjunction with the wound dressing component 11. Some manufacturers do not carry the wound dressing component 11 when producing and selling the negative pressure therapy system 100, while some manufacturers carry the wound dressing component 11 when producing and selling the negative pressure therapy system 100, and this application scheme does not limit this.

[0038] The wound dressing assembly 11 is used to cover the wound surface 10 and form a working cavity 110 between the wound surface 10 . The working cavity 110 is used to be filled with a dressing 111 .

[0039] It should be noted that the dressing 111 is filled in the working cavity 110 and is in contact with the wound surface 10 . The dressing 111 is made of a water-absorbent material to absorb liquid at the wound surface 10 . When the dressing 111 absorbs a sufficient amount of liquid, it also has the function of moistening the wound surface 10 .

[0040] The peristaltic pump 14 has a pump inlet and a pump outlet. The pump inlet is used to connect to a liquid source, and the pump outlet is connected to the wound dressing assembly 11 through the perfusion tube 12. When the peristaltic pump 14 is running, it drives the perfusion liquid to be injected into the working chamber 110 through the perfusion tube 12. After the perfusion liquid is injected into the working chamber 110, the perfusion liquid can infiltrate the dressing 111, so that the dressing 111 is in a wet state, so that the perfusion liquid can better moisten the wound surface 10 through the dressing 111.

[0041] The waste liquid tank 15 is connected to the wound dressing assembly 11 through the drainage tube 13 , so that excess waste liquid in the wound dressing assembly 11 can flow into the waste liquid tank 15 through the drainage tube 13 , and the waste liquid is collected by the waste liquid tank 15 .

[0042] The electric valve 16 is used to connect between the waste liquid tank 15 and the wound dressing assembly 11, for example, it is set on the drainage tube 13. The electric valve 16 has a switchable first state and a second state. The electric valve 16 is used to connect the waste liquid tank 15 and the working chamber 110 in the first state. At this time, the waste liquid in the working chamber 110 can flow to the waste liquid tank 15 through the drainage tube 13. The electric valve 16 is used to disconnect the waste liquid tank 15 and the working chamber 110 in the second state. At this time, the working chamber 110 and the waste liquid tank 15 are not connected to each other, and the working chamber 110 and the waste liquid tank 15 are separated into two independent spaces.

[0043] The vacuum pump 17 is connected to the waste liquid tank 15 so as to suck the liquid in the working chamber 110 through the drainage tube 13 when negative pressure is formed in the waste liquid tank 15. Therefore, when the electric valve 16 is in the first state, the vacuum pump 17 forms a negative pressure in the waste liquid tank 15. Even if the air pressure in the waste liquid tank 15 is lower than the air pressure in the working chamber 110, the liquid in the working chamber 110 is sucked into the waste liquid tank 15 through the drainage tube 13 under the action of the air pressure difference until the air pressure difference disappears, thereby reducing the residual liquid in the working chamber 110 and preventing the liquid in the drainage tube 13 from flowing back to the working chamber 110.

[0044] The pressure sensor 18 is used to detect the pressure in the waste liquid tank 15 or the working chamber 110 , or the pressure sensor 18 can be used to detect the pressure in the waste liquid tank 15 and the working chamber 110 at the same time.

[0045] In the present application, the number and installation position of the pressure sensor 18 are not limited. For example, the pressure sensor 18 can be installed in the waste liquid tank 15, and the pressure sensor 18 is used to detect the pressure in the waste liquid tank 15. For another example, the pressure sensor 18 is installed on the drainage tube 13 between the waste liquid tank 15 and the electric valve 16, and the pressure sensor 18 can also detect the pressure in the waste liquid tank 15. In addition, the pressure sensor 18 is installed on the drainage tube 13 between the wound dressing assembly 11 and the electric valve 16, and the pressure sensor 18 can detect the pressure in the working chamber 110. Even, the pressure sensor 18 is installed in the waste liquid tank 15 and on the drainage tube 13 between the wound dressing assembly 11 and the electric valve 16 at the same time, so that the pressure in the waste liquid tank 15 and the working chamber 110 can be detected at the same time.

[0046] It should be noted that when the electric valve 16 is in the first state and there is no liquid flowing in the drainage tube 13, the pressure sensor 18 at any position in the wound dressing assembly 11, the drainage tube 13 and the waste liquid tank 15 can simultaneously detect the pressure in the waste liquid tank 15 and the working chamber 110.

[0047] The main control unit 19 is in communication connection with the peristaltic pump 14 , the electric valve 16 , and the vacuum pump 17 . The main control unit 19 is used to control the negative pressure therapy system 100 to cycle through the first stage, the second stage, the second stage, and the fourth stage in sequence.

[0048] In the first stage, the electric valve 16 is in the first state, and the vacuum pump 17 is in the start state, so that negative pressure is generated in the drainage tube 13 and the working chamber 110 and lasts for a first time. At this time, the liquid at the wound surface 10 can be absorbed by the dressing 111, and a certain negative pressure value can be reached in the working chamber 110. The dressing 111 is compressed under the action of the negative pressure, and the liquid absorbed by the dressing 111 is sucked into the drainage tube 13 under the action of the negative pressure, so that less liquid remains at the wound surface 10.

[0049] In the second stage, the electric valve 16 is in the second state to cut off the drainage tube 13, and then the vacuum pump 17 stops working to maintain a negative pressure environment in the working chamber 110. At this time, the dressing 111 remains in a compressed state.

[0050] In the third stage, the peristaltic pump 14 is in a start-up state to deliver a fixed amount of perfusion liquid to the working chamber 110 , and as the perfusion liquid enters, the dressing 111 expands, and the perfusion liquid evenly fills the dressing 111 .

[0051] It can be understood that as the perfusion liquid gradually enters the working chamber 110, the negative pressure in the working chamber 110 gradually decreases, and the dressing 111 can gradually expand. The attraction generated by the expansion of the dressing 111 allows the perfusion liquid to evenly fill the entire dressing 111. During the expansion of the dressing 111, the water absorption of the dressing 111 can be maintained in a relatively saturated state, so that the perfusion liquid can evenly contact the wound surface 10 through the dressing 111.

[0052] In the fourth stage, the peristaltic pump 14 stops running, so that the perfusion liquid soaks in the dressing 111 for a second time. During the second time, the perfusion liquid can fully contact and evenly moisten the wound surface 10 through the dressing 111.

[0053] Reference Figure 2 As shown, Figure 2 L1 in the figure is the liquid level of the perfusion liquid in the dressing 111 after the perfusion liquid is injected into the dressing 111 under normal pressure. It can be seen that under the action of gravity, the perfusion liquid is concentrated in the lower part of the dressing 111. L2 shows the liquid level of the perfusion liquid in the dressing 111 after the perfusion liquid is injected into the dressing 111 under the negative pressure environment of the third stage. It can be seen that the perfusion liquid in the dressing 111 is distributed more evenly in the dressing 111 at this time.

[0054] The negative pressure therapy system 100 with automatic irrigation function of the present application is controlled by the main control unit 19 to cycle the first stage, the second stage, the second stage and the fourth stage, and the dressing 111 can be switched between the compressed and expanded states by adjusting the negative pressure in the working chamber 110. In the process of compression of the dressing 111, the water absorption capacity of the dressing 111 is gradually weakened, which is conducive to the liquid in the dressing 111 to be discharged from the dressing 111 and flow to the waste liquid tank 15 through the drainage tube 13. At this time, the liquid at the wound surface 10 can be more thoroughly attracted to the waste liquid tank 15, and less liquid remains at the wound surface 10. In the process of expansion of the dressing 111, the water absorption capacity of the dressing 111 is gradually enhanced, and the perfusion liquid flowing into the working chamber 110 through the perfusion tube 12 can evenly fill the dressing 111 under the attraction generated by the expansion of the dressing 111. At this time, the perfusion liquid can evenly moisten the wound surface 10 through the dressing 111.

[0055] In some embodiments, in the third and fourth stages, the working chamber 110 is in a negative pressure environment. Therefore, in the third and fourth stages, the dressing 111 is still in a compressed state under the negative pressure environment, and the dressing 111 is compressed to different degrees according to the negative pressure value in the working chamber 110. The greater the negative pressure value, the more thoroughly the sponge is compressed.

[0056] It should be noted that in the fourth stage, the negative pressure in the working chamber 110 is not greater than the negative pressure in the working chamber 110 in the third stage. At this time, in the process from the third stage to the fourth stage, the dressing 111 can still be in a state of slow expansion, and the dressing 111 has not fully expanded in the fourth stage. The attraction generated by the expansion of the dressing 111 helps to keep the perfusion liquid evenly distributed in the dressing 111.

[0057] In addition, the dressing 111 is always in a tendency to expand during the process from the third stage to the fourth stage, which can ensure that the water absorption capacity of the dressing 111 is gradually enhanced, and prevent the liquid absorbed by the dressing 111 from being discharged during the third stage and the fourth stage.

[0058] Furthermore, if Figure 2 As shown, in the first stage, the air pressure in the working chamber 110 reaches -125 mmHg; in the third stage, the air pressure in the working chamber 110 reaches -60 mmHg; and in the fourth stage, when the second time is reached, the air pressure in the working chamber 110 reaches -30 mmHg.

[0059] exist Figure 2In the example, in the first stage, the dressing 111 is compressed to L3 under the air pressure of -125 mmHg in the working chamber 110. After the perfusion liquid is injected in the third stage, the air pressure in the working chamber 110 rises to -60 mmHg, and the dressing 111 gradually expands to L4. In the fourth stage, the dressing 111 absorbs the liquid exuded from the wound 10 and expands slowly. Finally, when the second time is reached, the air pressure in the working chamber 110 reaches -30 mmHg. At this time, the dressing 111 is still in a compressed state under the action of the -30 mmHg air pressure, and the liquid in the dressing 111 is distributed more evenly. In addition, during the above-mentioned whole process, the dressing 111 is always in the process of expansion, the water absorption capacity of the dressing 111 is gradually enhanced, and the liquid absorbed by the dressing 111 is not easy to be discharged again.

[0060] In some embodiments, Figure 2 As shown, the wound dressing assembly 11 includes a suction cup 112, which is used to define a working chamber 110 with the wound surface 10, and the irrigation tube 12 and the drainage tube 13 are both connected to the suction cup 112, and the suction cup 112 is a flexible member.

[0061] It can be understood that the suction cup 112 is used to fix the wound dressing assembly 11 on the wound surface 10. When the wound dressing assembly 11 is set on the wound surface 10 through the suction cup 112, a small amount of negative pressure is generated in the working chamber 110 under the action of the suction cup 112, so that the wound dressing assembly 11 is pressed on the wound surface 10 under the action of atmospheric pressure. At the same time, since the suction cup 112 is a flexible member, when the negative pressure in the working chamber 110 increases, the suction cup 112 can be compressed toward the wound surface 10, so that the volume of the working chamber 110 and the dressing 111 are compressed at the same time. When the negative pressure in the working chamber 110 decreases, the volume of the working chamber 110 and the dressing 111 can also expand at the same time, ensuring that the position of the dressing 111 in the working chamber 110 does not deviate, thereby improving the stability of the contact between the dressing 111 and the wound surface 10.

[0062] Optionally, the suction cup 112 can be fixed around the wound surface by a sealant 113 to improve the sealing performance.

[0063] In the first stage, when the volume of the working chamber 110 is compressed to a set ratio of the natural volume, the vacuum pump 17 stops running. The natural volume refers to the volume when there is no pressure difference between the inside and outside of the working chamber 110. In this way, it is possible to prevent the negative pressure in the working chamber 110 from being too large, resulting in a large pressure difference between the inside and outside of the working chamber 110, and to prevent the atmospheric pressure from being too large at the wound dressing assembly 11 to compress the wound 10.

[0064] Of course, when the product is actually running, since the pressure value in the working chamber 110 is easy to measure and the pressure value measurement is more accurate, the operation of the vacuum pump 17, peristaltic pump 14 and other components are usually controlled by the detected pressure value change. In some schemes, there is a certain change relationship between the pressure value of the working chamber 110 and its volume. When the volume of the working chamber 110 needs to expand or compress to a set ratio of the natural volume, the pressure value of the working chamber 110 needs to drop or rise to a certain set pressure. Therefore, when the pressure value of the working chamber 110 changes to the set pressure, the vacuum pump 17, peristaltic pump 14 and other components can be controlled to start or stop.

[0065] Furthermore, the dressing 111 is suitable for being configured as a sponge, and the perfusion fluid is physiological saline.

[0066] It is understandable that the sponge has good water absorption, and due to the porous structure of the sponge, the sponge can remain moist after absorbing sufficient water, which is convenient for the contact between the perfusion liquid and the wound surface 10. The fluidity of the physiological saline is good, and the sponge has a siphon effect on the physiological saline, so that the physiological saline can be evenly distributed in the sponge, and the contact between the physiological saline and the wound surface 10 can be relatively sufficient.

[0067] In the first stage, when the volume of the working chamber 110 is compressed to 20-30% of the natural volume, the vacuum pump 17 stops operating. Figure 2 In the example, the volume of the working chamber 110 is reduced to about 26% under the action of negative pressure, and the dressing 111 is compressed to L3 under the action of negative pressure. At this time, the negative pressure has a good compression effect on the dressing 111 and will not cause pressure on the wound surface 10.

[0068] Furthermore, if Figure 2 As shown, the wound surface 10 is suitable for being at an angle of 45 degrees to the horizontal plane. It is understandable that under gravity, the liquid in the dressing 111 will flow to the lower part of the dressing 111. The negative pressure therapy system 100 of the present application can still maintain a relatively uniform distribution of the perfusion liquid in the dressing 111 when the wound surface 10 is at an angle of 45 degrees to the horizontal plane, so as to ensure the moisturizing effect of the perfusion liquid on the wound surface 10.

[0069] In the negative pressure therapy system 100 of the present application, there is no restriction on the angle between the wound surface 10 and the horizontal plane. Since the distribution of the perfusion liquid in the dressing 111 is relatively uniform when the angle between the wound surface 10 and the horizontal plane is 45 degrees, the distribution of the perfusion liquid in the dressing 111 can also be relatively uniform when the angle between the wound surface 10 and the horizontal plane is between 0-45 degrees. Even when the angle between the wound surface 10 and the horizontal plane is greater than 45 degrees, the negative pressure therapy system 100 can also make the distribution of the perfusion liquid in the dressing 111 more uniform.

[0070] In some embodiments, the electric valve 16 is a normally open solenoid valve. Thus, the normally open solenoid valve can completely shut off the drainage tube 13, so that when the electric valve 16 is in the second state, it can completely cut off the connection between the waste liquid tank 15 and the working chamber 110, so that the working chamber 110 forms a relatively closed space, which helps to maintain negative pressure in the working chamber 110.

[0071] In some specific embodiments, Figure 3-Figure 7 As shown, the negative pressure treatment system 100 with automatic irrigation function further includes a pinch valve 20, and the electric valve 16 and the waste liquid tank 15 are components of the pinch valve 20. The pinch valve 20 includes: a mounting body 21, an electric valve 16 and an elastic body 22.

[0072] The mounting body 21 is provided with a clamping surface 210, and a section of the drainage tube 13 is located on the clamping surface 210. The electric valve 16 has a valve body 161 and a valve core 162. The valve body 161 is movably mounted on the mounting body 21, the valve core 162 is arranged opposite to the clamping surface 210, and a section of the drainage tube 13 is located between the clamping surface 210 and the valve core 162. When the electric valve 16 is in the first state, the valve core 162 is located in the retracted position, and when the electric valve 16 is in the second state, the valve core 162 is located in the extended position.

[0073] The valve core 162 is movable between an extended position and a retracted position. When in the extended position, the valve core 162 is close to the clamping surface 210 to cut off the flow in the drainage tube 13. When in the retracted position, the distance between the valve core 162 and the clamping surface 210 is greater than the distance between the valve core 162 and the clamping surface 210 when in the extended position. The elastic body 22 is connected to the electric valve 16, and the elastic body 22 is used to drive the electric valve 16 to approach the clamping surface 210.

[0074] In the present application, the number of the electric valves 16 is not limited and can be Figure 3 When the number of the electric valve 16 is more than one, the plurality of electric valves 16 can be separated from each other and act on different sections of the drainage tube 13, and the plurality of electric valves 16 can also act on the same section of the drainage tube 13.

[0075] The clamping surface 210 can be a solid surface on the mounting body 21, or a virtual reference surface on the mounting body 21. For example, the clamping surface 210 is a solid surface on the mounting body 21. As shown in the figure, the surface of a certain structure of the mounting body 21 (such as the groove 212 described below) is the clamping surface 210, the electric valve 16 is one, and a section of the drainage tube 13 is located between the valve core 162 and the clamping surface 210. When the pinch valve 20 is to cut off the pipe flow, the valve core 162 is pressed toward the clamping surface 210, and the distance between the two is less than or equal to twice the wall thickness of the drainage tube 13.

[0076] Taking the clamping surface 210 as an example of a virtual reference surface on the mounting body 21, two electric valves 16 are mounted on the mounting body 21, the two electric valves 16 are arranged opposite to each other, and the drainage tube 13 is located between the valve cores 162 of the two electric valves 16. At this time, the plane passing through the axis of the drainage tube 13 can be used as the clamping surface 210. When the tube pinch valve 20 is to cut off the pipe flow, the two valve cores 162 are pressed toward the clamping surface 210, the distance between the two valve cores 162 is less than or equal to twice the wall thickness of the drainage tube 13, and the distance between each valve core 162 and the clamping surface 210 is less than or equal to the wall thickness of the drainage tube 13.

[0077] To simplify the description, when describing the specific structure of the pinch valve 20 below, the clamping surface 210 is assumed to be a solid surface on the mounting body 21 and the electric valve 16 is taken as one.

[0078] During the movement of the valve core 162 from the retracted position toward the extended position, the distance between the valve core 162 and the clamping surface 210 gradually decreases. As the above-mentioned gap decreases, a part of the drainage tube 13 is clamped between the clamping surface 210 and the valve core 162, so that the flow area of ​​this part of the drainage tube 13 also decreases with the gap. When the valve core 162 is in the extended position, the gap between the valve core 162 and the clamping surface 210 reaches a minimum. At this time, this part of the drainage tube 13 is pressed by the valve core 162 and the clamping surface 210, and its flow area is zero, so as to achieve the interruption of the flow of liquid in the drainage tube 13.

[0079] It can be understood that the valve core 162 moves between the extended position and the retracted position under the drive of the valve body 161. The valve core 162 has a maximum extension distance and a maximum retraction distance relative to the valve body 161. During the installation of the clamp valve 20, installation tolerances are easily generated, resulting in a gap between the valve body 161 and the installation body 21, so that the valve core 162 is far away from the clamping surface 210 when it is in the extreme position. The installation tolerance may also cause the maximum extension distance of the valve core 162 relative to the valve body 161 to be too large, resulting in the gap between the valve core 162 and the clamping surface 210 being too small when the valve core 162 is in the extended position, thereby damaging the drainage tube 13.

[0080] In addition, the waste liquid tank 15 is mounted on the mounting body 21 , and the mounting body 21 constitutes the waste liquid tank 15 , so that the structures of the waste liquid tank 15 and the mounting body 21 are simpler.

[0081] Therefore, by providing the elastic body 22, the elastic body 22 presses the electric valve 16 against the mounting body 21 toward the clamping surface 210, which can reduce the gap between the valve body 161 and the mounting body 21, ensure that the valve core 162 can be close to the clamping surface 210 when in the extended position, and ensure the effect of cutting off the flow of the drainage tube 13 when the clamping valve 20 is closed. In addition, if the electric valve 16 is fixed on the mounting body 21, when the extension distance of the valve core 162 in the extended position is too large, resulting in the distance between the valve core 162 and the clamping surface 210 being too small, there is a possibility of crushing the drainage tube 13. At this time, the valve core 162 can generate a reaction force on the valve body 161, pushing the valve body 161 away from the clamping surface 210, so that the electric valve 16 as a whole can overcome the elastic force of the elastic body 22 and move in the direction away from the mounting body 21, thereby avoiding the excessive extrusion force between the valve core 162 and the clamping surface 210 to damage the drainage tube 13.

[0082] In the present application, there is no limitation on the way in which the valve body 161 drives the valve core 162. For example, the valve body 161 may be provided with a motor, and the motor and the valve core 162 are connected by a driving rod. In this case, the movement of the valve core 162 is controlled by the motor. For another example, the valve body 161 is set as an electromagnet, and the valve core 162 is set as a magnetic core. In this case, by controlling the current passing through the electromagnet, the electromagnet generates different magnetic fields. Under different magnetic fields, the valve core 162 can be subjected to different magnetic field forces to produce different movements, thereby realizing the control of the movement of the valve core 162. The electric valve 16 can also adopt other structures, such as using a shape memory alloy valve.

[0083] Furthermore, if Figure 3-Figure 5 As shown, the mounting body 21 includes: a mounting cover 211 and a waste liquid tank 15, the mounting cover 211 is connected to the waste liquid tank 15, and the electric valve 16 is mounted on the mounting cover 211. In such a structure, the electric valve 16 is connected to the waste liquid tank 15 through the mounting cover 211, so that the connection structure of the electric valve 16 is arranged on the mounting cover 211, which can reduce the connection structure on the waste liquid tank 15, make the structure of the waste liquid tank 15 more stable, and reduce the occurrence of water leakage in the waste liquid tank 15.

[0084] Among them, a groove 212 for accommodating the drainage tube 13 is defined between the waste liquid tank 15 and the mounting cover 211, and a part of the inner wall of the groove 212 constitutes a clamping surface 210, and one end of the drainage tube 13 is connected to the waste liquid tank 15. Therefore, the waste liquid tank 15 is accommodated in the groove 212 to prevent the waste liquid tank 15 from moving and deforming and affecting the circulation in the waste liquid tank 15, and the waste liquid tank 15 is located in the groove 212, which can protect the waste liquid tank 15 and prevent the waste liquid tank 15 from being damaged by external influences. At the same time, the clamping surface 210 is directly formed by a part of the inner wall of the groove 212, without the need to set up another structure, and the clamping surface 210 will not move to affect the coordination between the electric valve 16 and the clamping surface 210.

[0085] Specifically, Figure 6 , Figure 7 As shown, the groove 212 is arranged on the side of the waste liquid tank 15 facing the installation cover 211, the valve body 161 of the electric valve 16 is located on the side of the installation cover 211 away from the waste liquid tank 15, and the installation cover 211 is provided with a matching hole 213 for passing the valve core 162. Therefore, the groove 212 and the electric valve 16 are respectively located on both sides of the installation cover 211, and the groove 212 and the electric valve 16 are only separated by the installation cover 211, so that by correspondingly arranging the valve core 162, the matching hole 213 and the clamping surface 210, when the waste liquid tank 15 is arranged in the groove 212, the valve core 162 of the electric valve 16 can pass through the installation cover 211 through the matching hole 213 to directly match with the clamping surface 210, so as to clamp the waste liquid tank 15 to cut off the flow of the waste liquid tank 15.

[0086] Specifically, Figure 6 , Figure 7 As shown, the inner wall of the groove 212 facing the valve core 162 forms a protrusion 214, and the surface of the protrusion 214 constitutes the clamping surface 210. Therefore, the area of ​​the clamping surface 210 is small and protrudes from the inner wall of the groove 212. When the valve core 162 is in the extended position and cooperates with the clamping surface 210, the pressure surface of the clamping surface 210 on the drainage tube 13 is small, the pressure is more concentrated, and it has a better effect of cutting off the flow of the drainage tube 13. At the same time, due to the more concentrated pressure, the drainage tube 13 is not easy to slide on the clamping surface 210 during the process of the valve core 162 and the clamping surface 210 approaching, which can also improve the cooperation effect between the valve core 162 and the clamping surface 210.

[0087] In some embodiments, Figure 6 , Figure 7 As shown, the wall thickness of the waste liquid tank 15 at the clamping surface 210 is greater than the wall thickness at other locations. As a result, the structural strength of the clamping surface 210 can be increased, and the force bearing capacity of the clamping surface 210 can be increased, so that the clamping surface 210 is not easily deformed under the pressure of the valve core 162, thereby ensuring the matching effect between the valve core 162 and the clamping surface 210 during long-term use of the pinch valve 20, and improving the reliability of the pinch valve 20.

[0088] In some embodiments, Figure 3-Figure 7As shown, the pinch valve 20 further includes at least one guide body 23, which is connected to the mounting body 21, and the electric valve 16 cooperates with the guide body 23 and moves along the guide body 23. Under such a structure, the guide body 23 defines the moving direction of the electric valve 16, that is, the electric valve 16 moves along the guide body 23 in the direction away from and close to the mounting body 21. Therefore, when the electric valve 16 is pressed by the elastic body 22 or the electric valve 16 is lifted up by the valve core 162 away from the mounting body 21, it can ensure that the moving direction of the electric valve 16 is consistent with the moving direction of the valve core 162, reduce the deviation of the moving direction of the valve core 162, and thus improve the matching effect between the valve core 162 and the clamping surface 210.

[0089] Furthermore, the guide body 23 is a guide column, and guide plates 163 with guide holes are provided on opposite sides of the valve body 161. A guide column is installed on the mounting body 21 corresponding to each guide hole, and the guide hole is sleeved on the guide body 23. The two ends of the elastic body 22 are respectively connected to the guide column and the guide plate 163. Thus, the guide plate 163 can move synchronously with the electric valve 16 along the guide column, and the guide plates 163 on both sides of the valve body 161 have a supporting effect on the electric valve 16, which can strengthen the limiting effect of the guide column on the active direction of the electric valve 16, thereby reducing the movement or shaking of the electric valve 16 in directions other than its active direction, and ensuring the matching effect of the valve core 162 and the clamping surface 210.

[0090] Specifically, the guide column is a screw, the elastic body 22 is a spring sleeved on the guide column, and a threaded column is provided on the mounting body 21 to match each screw. Thus, by passing the screw through the guide hole of the guide plate 163 and fitting on the threaded column of the mounting body 21, the screw and the threaded column together constitute the guide column, so that the electric valve 16 and the guide plate 163 can move along the screw and the screw column, and the spring sleeved on the guide column is located between the screw and the guide hole of the guide plate 163, so that the spring exerts pressure on the guide plate 163 and the electric valve 16 toward the mounting body 21, so that the electric valve 16 can be closely attached to the mounting body 21, and when the extension distance of the valve core 162 is too large, the electric valve 16 can be lifted by the valve core 162 and overcome the spring pressure to move in the direction of the compression spring.

[0091] Other structures and operations of the negative pressure therapy system 100 according to the embodiment of the present invention are known to ordinary technicians in the field and will not be described in detail here.

[0092] In the description of this specification, the description with reference to the terms "embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and purpose of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A negative pressure therapy system with automatic irrigation function, characterized in that: include: A peristaltic pump, the peristaltic pump having a pump inlet and a pump outlet, the pump inlet being used to connect to a liquid source, and the pump outlet being used to connect to a wound dressing assembly; A waste liquid tank, the waste liquid tank is used to connect the wound dressing assembly; An electric valve, the electric valve is used to be connected between the waste liquid tank and the wound dressing assembly, the electric valve has a switchable first state and a second state, the electric valve is used to connect the waste liquid tank and the wound dressing assembly in the first state, and the electric valve is used to disconnect the waste liquid tank and the wound dressing assembly in the second state; A vacuum pump, the vacuum pump being in communication with the waste liquid tank; A pressure sensor, used to detect the pressure in the waste liquid tank and / or the wound dressing assembly; A main control unit, the main control unit is communicatively connected with the peristaltic pump, the electric valve, and the vacuum pump; It also includes a pinch valve, wherein the electric valve and the waste liquid tank are components of the pinch valve; The pinch valve comprises: A mounting body, wherein the mounting body is provided with a clamping surface, the waste liquid tank is connected to the wound dressing assembly via a drainage tube, and a section of the drainage tube is located on the clamping surface; The electric valve comprises a valve body and a valve core, the valve body is movably mounted on the mounting body, the valve core is arranged opposite to the clamping surface, and a part of the drainage tube is located between the clamping surface and the valve core, the valve core is movable between an extended position and a retracted position, the valve core is located at the retracted position when the electric valve is in a first state, and the valve core is located at the extended position when the electric valve is in a second state, in the extended position, the valve core is close to the clamping surface to cut off the flow in the drainage tube, and in the retracted position, the distance between the valve core and the clamping surface is greater than the distance between the valve core and the clamping surface in the extended position; an elastic body, the elastic body being connected to the electric valve, and the elastic body being used to drive the electric valve to approach the clamping surface; The mounting body comprises: a mounting cover and the waste liquid tank, the mounting cover is connected to the waste liquid tank, and the electric valve is mounted on the mounting cover; Wherein, a groove for accommodating the drainage tube is defined between the waste liquid tank and the mounting cover, a part of the inner wall of the groove constitutes the clamping surface, and one end of the drainage tube is connected to the waste liquid tank; The pinch valve further comprises at least one guide body, the guide body being connected to the mounting body, the electric valve cooperating with the guide body and moving along the guide body; The guide body is a guide column, and guide plates with guide holes are provided on opposite sides of the valve body. The guide column is installed on the mounting body corresponding to each guide hole, and the guide hole is sleeved on the guide body. The two ends of the elastic body are respectively connected to the guide column and the guide plate.

2. The negative pressure therapy system with automatic irrigation function according to claim 1, characterized in that: The electric valve is a normally open solenoid valve.

3. The negative pressure therapy system with automatic irrigation function according to claim 1, characterized in that: The main control unit includes a calculation module, which calculates the rotation speed of the vacuum pump by obtaining the pressure value detected by the pressure sensor when the wound oxygenation negative pressure therapy system is initially operated. The vacuum pump operates according to the calculation result of the calculation module.

4. The negative pressure therapy system with automatic irrigation function according to claim 1, characterized in that: The groove is arranged on a side of the waste liquid tank facing the installation cover, the valve body of the electric valve is located on a side of the installation cover away from the waste liquid tank, and a matching hole for passing the valve core is arranged on the installation cover.

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