Medical negative pressure suction device with backflow prevention structure

Abstract

The utility model relates to the technical field of medical instruments, in particular to a medical negative pressure suction device with an anti-backflow structure, which comprises a liquid collecting bin, a control bin, a liquid collecting bin cover and a connecting pipe, the liquid collecting bin cover is connected to the upper end of the liquid collecting bin, the control bin is connected to the upper end of the liquid collecting bin cover, and the connecting pipe is connected to the upper end of the control bin; a fine liquid collecting bin is arranged in the liquid collecting bin, and the fine liquid collecting bin is communicated with the liquid collecting bin; a detachable connecting structure is arranged between the control bin and the liquid collecting bin cover, a display screen fixing opening and a plurality of key holes are formed in the control bin, a display screen is mounted at the display screen fixing opening, and control keys are mounted in the key holes. According to the medical negative pressure suction device, the one-way liquid guide film A is installed in the liquid inlet hole, one-way flowing of liquid can be achieved through the one-way liquid guide film A, the liquid is prevented from flowing back into the body of a patient, safety and effectiveness of the medical negative pressure suction device are guaranteed, and wound healing and normal liquid discharging are promoted.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a medical negative pressure suction device with an anti-backflow structure. Background Art

[0002] At present, with the continuous development of medicine, drainage technology is widely used in surgical operations, mainly to drain the accumulated blood, gas, pus, postoperative exudate, etc. in the chest and abdominal cavities to the outside of the body, so as to change the biological environment of the infected site, inhibit the reproduction of local bacteria, and prevent the spread of infection. In surgical operations, negative pressure drainage devices are often used to drain the accumulated fluid in the chest and abdominal cavities to the outside of the body.

[0003] However, during actual operation, if the existing medical negative pressure suction device is improperly operated or fails (for example, an abnormality in the negative pressure suction device prevents the liquid from being effectively drawn into the liquid collection chamber, resulting in reflux), it may cause the liquid to reflux into the patient's body and cause secondary infection to the patient.

[0004] Therefore, there is a need for a medical negative pressure suction device with an anti-backflow structure that can solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to provide a medical negative pressure suction device with an anti-backflow structure. The utility model is provided with a one-way liquid guide membrane A inside the liquid inlet port, through which the one-way liquid guide membrane A can realize one-way flow of liquid, prevent the liquid from flowing back into the patient's body, so as to ensure the safety and effectiveness of the medical negative pressure suction device, and promote wound healing and normal discharge of liquid.

[0006] The technical solution adopted by the utility model to solve the above technical problems is: a medical negative pressure suction device with an anti-backflow structure, comprising a liquid collecting bin, a control bin, a liquid collecting bin cover and a connecting pipe, wherein the liquid collecting bin cover is connected to the upper end of the liquid collecting bin, the control bin is connected to the upper end of the liquid collecting bin cover, and the connecting pipe is connected to the upper end of the control bin;

[0007] A precision liquid collecting bin is arranged inside the liquid collecting bin, and the precision liquid collecting bin and the liquid collecting bin are connected to each other;

[0008] The control compartment and the liquid collecting compartment cover are connected in a detachable manner. A display screen fixing opening and a plurality of button holes are provided on the control compartment. A display screen is installed at the display screen fixing opening, and control buttons are installed in the button holes.

[0009] A negative pressure pump and electronic components are installed inside the control chamber, and the negative pressure pump, control buttons, display screen and electronic components are electrically connected. A joint is fixedly connected to the upper end of the control chamber, and one end of the connecting pipe is plugged into the joint.

[0010] The joint is provided with an annular hole, a liquid inlet opening and a central cavity, the liquid inlet opening and the connecting pipe are connected to each other, the central cavity is arranged between the liquid inlet opening and the annular hole, the liquid inlet opening and the annular hole are connected to each other through the central cavity, and a unidirectional liquid guide membrane A is installed inside the liquid inlet opening;

[0011] A liquid suction head is fixedly connected to the upper end of the liquid collecting bin cover, one end of the liquid suction head is connected to the negative pressure pump, an anti-backflow mechanism is installed between the connecting pipe and the liquid suction head, the anti-backflow mechanism includes a connecting ring and a connecting plug, the connecting ring is screwed to the annular hole and the liquid suction head through threads, an elastic part is fixedly connected to the inner side wall of the connecting ring, a sealing protrusion is integrally connected to the upper end of the elastic part, and the position of the sealing protrusion corresponds to the position of the annular hole.

[0012] Furthermore, the other end of the connecting tube is connected with a single straight-through joint, which is used to be connected to the suction tube, and a Robert clamp is arranged on the connecting tube.

[0013] Furthermore, the electronic components include a main board, a liquid level sensor, a battery and a solenoid valve, and the liquid level sensor, the battery and the solenoid valve are all electrically connected to the main board.

[0014] Furthermore, a negative pressure pump mounting seat is fixedly connected to the bottom of the liquid collecting bin cover, and a negative pressure pump limiting groove for fixing the negative pressure pump is provided on the negative pressure pump mounting seat.

[0015] Furthermore, two battery fixing plates are fixedly connected to the upper end of the liquid collecting bin cover, and the battery fixing plates are used to fix the batteries.

[0016] Furthermore, the bottom of the connecting plug is plugged into the liquid pipetting head, and a one-way liquid guide membrane B is installed inside the connecting plug.

[0017] Furthermore, a limiting frame is arranged between the liquid collecting bin cover and the liquid collecting bin, the limiting frame is used to limit the electronic components, a mainboard fixing slot is opened on the limiting frame, a plurality of plug posts are fixedly connected to the bottom of the limiting frame, a plurality of positioning cylinders are fixedly connected to the upper end of the liquid collecting bin cover, the positions of the positioning cylinders correspond to the positions of the plug posts, and the plug posts and the positioning cylinders are plugged into each other.

[0018] Furthermore, a handle is fixedly connected to the control compartment, a plurality of screw holes are opened on the control compartment, fixing screws are installed in the screw holes, and the fixing screws and the limit frame are screwed and fixed to each other.

[0019] The advantages of the utility model are: the utility model provides a medical negative pressure suction device with an anti-backflow structure, which has the following technical effects:

[0020] 1. The utility model has an elastic member fixedly connected to the inner side wall of the connecting ring, and a blocking protrusion is integrally connected to the upper end of the elastic member. The position of the blocking protrusion corresponds to the position of the annular hole. The elastic member in the utility model is made of rubber. When the negative pressure pump is turned on, the attraction acts on the elastic member and sucks the blocking protrusion out of the annular hole. The sucked liquid enters the liquid suction head through the connecting plug. After the liquid suction is completed, due to the resilience of the elastic member, the blocking protrusion rebounds to the annular hole for blocking, thereby preventing the sucked liquid from flowing back.

[0021] 2. The utility model is provided with a one-way liquid guide membrane A inside the liquid inlet port, through which one-way liquid flow can be achieved to prevent liquid from flowing back into the patient's body, thereby ensuring the safety and effectiveness of the medical negative pressure suction device, promoting wound healing and normal liquid discharge. The bottom of the connecting plug in the utility model is plugged into the liquid suction head, and a one-way liquid guide membrane B is installed inside the connecting plug, which plays a role in further preventing liquid backflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0024] Figure 2 This is a schematic diagram of the explosion mechanism of the utility model;

[0025] Figure 3 It is a schematic diagram of the connection structure of the anti-backflow mechanism in the utility model;

[0026] Figure 4 It is a schematic diagram of the explosion structure of the anti-backflow mechanism in the utility model;

[0027] Figure 5 It is a cross-sectional structural schematic diagram of the backflow prevention mechanism in the utility model;

[0028] Figure 6 It is a connection block diagram of the electronic components in the utility model;

[0029] in:

[0030] 1. Liquid collection tank; 101. Precision liquid collection tank; 2. Control tank;

[0031] 201. Display screen; 202. Handle; 203. Child lock button;

[0032] 204, pressure relief key; 205, adjustment key; 206, power key;

[0033] 207, screw hole; 208, button hole; 209, connector;

[0034] 2091, annular hole; 2092, liquid inlet opening; 2093, central cavity;

[0035] 2094, unidirectional liquid guide membrane A; 210, display screen fixing port; 3, liquid collecting chamber cover;

[0036] 301, positioning cylinder; 302, liquid suction head; 303, battery fixing plate;

[0037] 4. Connecting pipe; 5. Single straight connector; 6. Robert clamp;

[0038] 7. Fixing screws; 8. Limiting bracket; 801. Inserting column;

[0039] 802, mainboard fixing slot; 9, negative pressure pump mounting seat; 901, negative pressure pump limiting slot;

[0040] 10. Backflow prevention mechanism; 1001. Connecting ring; 10011. Elastic member;

[0041] 10012, blocking protrusion; 1002, connecting plug; 10021, one-way liquid guide membrane B;

[0042] 11. Negative pressure pump; 12. Main board; 13. Liquid level sensor;

[0043] 14. Battery; 15. Solenoid valve. DETAILED DESCRIPTION

[0044] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0045] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply 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 utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. 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 an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0046] Embodiment 1:

[0047] Figure 1 It is a three-dimensional structural schematic diagram of the utility model. Figure 2 This is a schematic diagram of the explosion mechanism of the utility model. Figure 3 This is a schematic diagram of the connection structure of the anti-backflow mechanism in the utility model. Figure 4 This is a schematic diagram of the explosion structure of the anti-backflow mechanism in the utility model. Figure 5 It is a cross-sectional structural diagram of the backflow prevention mechanism in the utility model. Figure 6 It is a connection block diagram of the electronic components in the utility model, such as Figure 1 , Figure 2 , Figure 3 ,

[0048] Figure 4 , Figure 5 and Figure 6A medical negative pressure suction device with an anti-backflow structure is shown, comprising a liquid collecting bin 1, a control bin 2, a liquid collecting bin cover 3 and a connecting tube 4, wherein the liquid collecting bin cover 3 is connected to the upper end of the liquid collecting bin 1, the control bin 2 is connected to the upper end of the liquid collecting bin cover 3, and the connecting tube 4 is connected to the upper end of the control bin 2; the utility model is provided with a precision liquid collecting bin 101 inside the liquid collecting bin 1, a scale is provided on the precision liquid collecting bin 101, and the precision liquid collecting bin 101 is connected to the liquid collecting bin 1; medical personnel can observe and measure the amount of liquid sucked more accurately. The scale provides a clear liquid measurement, which helps medical staff understand the patient's fluid outflow so as to better carry out follow-up treatment. The utility model installs a negative pressure pump 11 and electronic components inside the control chamber 2. The negative pressure pump 11, control buttons, display screen 201 and electronic components are electrically connected. A joint 209 is fixedly connected to the upper end of the control chamber 2, and one end of the connecting pipe 4 and the joint 209 are plugged into each other; the joint 209 is provided with an annular hole 2091, a liquid inlet port 2092 and a central cavity. 2093, the liquid inlet port 2092 and the connecting tube 4 are interconnected, the central cavity 2093 is arranged between the liquid inlet port 2092 and the annular hole 2091, the liquid inlet port 2092 and the annular hole 2091 are interconnected through the central cavity 2093, a one-way liquid guide membrane A2094 is installed inside the liquid inlet port 2092, and the one-way liquid guide membrane A can realize one-way flow of liquid to prevent liquid from flowing back into the patient's body, so as to ensure the safety and effectiveness of the medical negative pressure suction device, promote wound healing and normal discharge of liquid;

[0049] The utility model has a liquid suction head 302 fixedly connected to the upper end of the liquid collecting bin cover 3, one end of the liquid suction head 302 is connected to the negative pressure pump 11, an anti-backflow mechanism 10 is installed between the connecting pipe 4 and the liquid suction head 302, the anti-backflow mechanism 10 includes a connecting ring 1001 and a connecting plug 1002, the connecting ring 1001 is screwed with the annular hole 2091 and the liquid suction head 302 through a thread, an elastic member 1001 is fixedly connected to the inner side wall of the connecting ring 1001, a blocking protrusion 10012 is integrally connected to the upper end of the elastic member 1001, the position of the blocking protrusion 10012 corresponds to the position of the annular hole 2091, the utility model has a liquid suction head 302 fixedly connected to the upper end of the liquid collecting bin cover 3, an end of the liquid suction head 302 is connected to the negative pressure pump 11, an anti-backflow mechanism 10 is installed between the connecting pipe 4 and the liquid suction head 302, the anti-backflow mechanism 10 includes a connecting ring 1001 and a connecting plug 1002, the connecting ring 1001 is screwed with the annular hole 2091 and the liquid suction head 302 through a thread, an elastic member 1001 is fixedly connected to the inner side wall of the connecting ring 1001, a blocking protrusion 10012 is integrally connected to the upper end of the elastic member 1001, the position of the blocking protrusion 10012 corresponds to the position of the annular hole 2091, The material of the elastic member 1001 in the new type is rubber. When the negative pressure pump 11 is turned on, the attraction acts on the elastic member 1001 and sucks the sealing protrusion 10012 out of the annular hole 2091. The sucked liquid enters the liquid suction head 302 through the connecting plug 1002. After the liquid suction is completed, due to the resilience of the elastic member 1001, the blocking protrusion 10012 rebounds to the annular hole 2091 for sealing to prevent the sucked liquid from flowing back. The bottom of the connecting plug 1002 in the utility model is plugged into the liquid suction head 302, and a unidirectional liquid guide membrane B10021 is installed inside the connecting plug 1002, which plays a role in further preventing the liquid from flowing back.

[0050] The utility model has a single straight joint 5 connected to the other end of the connecting tube 4, and the single straight joint 5 is used to be connected to the suction tube. A Robert clamp 6 is arranged on the connecting tube 4, and the suction flow rate can be controlled by the Robert clamp 6.

[0051] The control compartment 2 and the liquid collecting compartment cover 3 in the utility model are detachably connected. A display screen fixing port 210 and a plurality of button holes 208 are provided on the control compartment 2. A display screen 201 is installed at the display screen fixing port 210. Control buttons are installed in the plurality of button holes 208. The control buttons are sequentially provided with a child lock button 203, a pressure relief button 204, an adjustment button 205 and a switch button 206 from left to right. The battery 14, the negative pressure pump 11, the child lock button 203, the pressure relief button 204, the adjustment button 205, the switch button 206, the display screen 201 and the electronic components are electrically connected. The functions of the switch button 206 in the utility model include:

[0052] (1) When the device is powered off, press and hold for 2 seconds to power it on.

[0053] (2) When the device is on, press and hold for 2 seconds to shut it down.

[0054] (3) When the negative pressure pump 11 is turned off, lightly press it, and the electronic display will show "PAU". Press it again to turn on the negative pressure pump 11.

[0055] (4) When the negative pressure pump 11 is turned on, lightly touch and press to turn off the negative pressure pump 11.

[0056] The utility model sets a limiting frame 8 between the liquid bin cover and the liquid collecting bin 1, and a plurality of plug posts 801 are fixedly connected to the bottom of the limiting frame 8, and a plurality of positioning cylinders 301 are fixedly connected to the upper end of the liquid collecting bin cover 3, and the positions of the positioning cylinders 301 correspond to the positions of the plug posts 801, and the plug posts 801 and the positioning cylinders 301 are plugged into each other. The utility model opens a plurality of screw holes 207 on the control bin 2, and fixing screws 7 are installed in the screw holes 207, and the fixing screws 7 and the limiting frame 8 are screwed and fixed to each other. The utility model makes the connection between the various components stable through the above-mentioned connection structure, avoiding the risk of accidental loosening or falling off during the negative pressure suction process;

[0057] The functions of the pressure relief key 204 in the utility model include:

[0058] (1) When the child lock is unlocked, press and hold the pressure relief button 204 for 2 seconds to start pressure relief.

[0059] (2) Automatic pressure relief function: When the actual pressure value exceeds the upper limit of the set gear by 5 kpa, the automatic pressure relief function is activated. If the pressure cannot be released normally after the timeout, E3 is displayed on the display screen 201.

[0060] The functions of the child lock key 203 in the present invention include:

[0061] (1) Locking - When the device is unlocked, press the child lock button for 2 seconds to lock it (the child lock will automatically lock if there is no operation for 5 seconds).

[0062] (2) Unlock - When the device is locked, press and hold for 2 seconds to unlock the child lock.

[0063] (3) Displaying the set gear value - lightly touching and pressing the child lock button 203 displays the set negative pressure gear upper limit value (the original screen display will be restored after 5-10 seconds).

[0064] The limiting frame in the present invention is used to limit the electronic components. A mainboard fixing groove 802 is provided on the limiting frame to fix the mainboard 12 .

[0065] The utility model has a negative pressure pump mounting seat 9 fixedly connected to the bottom of the liquid collecting bin cover 3, and a negative pressure pump limiting groove 901 for fixing the negative pressure pump 11 is provided on the negative pressure pump mounting seat 9, and a liquid suction head 302 is fixedly connected to the upper end of the liquid collecting bin cover 3, one end of the liquid suction head 302 is interconnected with the negative pressure pump 11, and the other end of the liquid suction head 302 is inserted into the interior of the joint 209, and two battery fixing plates 303 are fixedly connected to the upper end of the liquid collecting bin cover 3, and the battery fixing plates 303 are used to fix the battery 14.

[0066] Working principle: The working principle of the utility model includes the following steps:

[0067] Step S1: After inserting the suction tube to its suction position, press and hold the power key 206 for 2 seconds to turn on the device; after turning on, the display screen 201 on the control compartment 2 will display the current working status and corresponding operation options.

[0068] Step S2: According to actual needs, the negative pressure value range can be adjusted to the corresponding gear through the adjustment key 205. The negative pressure suction gear is divided into five gears, specifically including:

[0069] (1) The battery voltage is 6V

[0070]

[0071]

[0072] (2) Battery voltage is 12V

[0073]

[0074] After the negative pressure adjustment is completed, the switch key 206 is lightly touched, and the display screen 201 displays "PAU". The switch key 206 is lightly touched again to start the negative pressure pump 11. During the startup process, the switch key 206 is lightly touched, and the negative pressure pump 11 stops working. At this time, the display screen 201 displays "PAU".

[0075] (1) When the pressure value displayed on the display screen 201 is higher than the upper limit of the gear position, the negative pressure pump 11 is started after the switch key 206 is lightly touched;

[0076] (2) When the pressure value displayed on the display screen 201 is within the gear range, the negative pressure pump 11 will not start after the switch key 206" is lightly touched.

[0077] When the negative pressure pump 11 stops working, if the gear needs to be changed, the adjustment key 205 can be lightly touched again to adjust the gear. After the adjustment is completed, the switch key 206 is lightly touched, and the display screen 201 displays "PAU".

[0078] (1) When the reselected gear is lower than the gear before the change, lightly touch the switch key 206, the device will automatically release pressure, and after the pressure is released, the negative pressure pump 11 starts to work.

[0079] (2) When the reselected gear is higher than the gear before the change, the switch key 206 is lightly touched and the negative pressure pump 11 starts to work.

[0080] When the value displayed on the display screen 201 reaches the lower limit of the preset pressure value gear, the negative pressure pump 11 stops working; after a period of negative pressure extraction, when the pressure value in the liquid collecting tank 1 is greater than the upper limit of the gear, the negative pressure pump 11 starts automatically and stops working when the pressure value reaches the lower limit of the gear.

[0081] Step S3: After the negative pressure adjustment is completed, lightly press the switch key 206, and when the display screen 201 displays "PAU", lightly press the switch key 206 again to start the negative pressure pump 11;

[0082] Step S4: Open the Robert clamp 6 on the connecting tube 4 to start drainage. The suction tube transports the accumulated fluid to the interior of the precision liquid collecting bin 101 through the connecting tube 4. After the liquid in the precision liquid collecting bin 101 is full, it flows into the liquid collecting bin 1;

[0083] Step S5: When the drainage stops after the suction is completed, long press the power key 2062 seconds, the device is turned off, and the display screen 201 displays "OFF".

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A medical negative pressure suction device with an anti-backflow structure, comprising a liquid collecting chamber (1), a control chamber (2), a liquid collecting chamber cover (3) and a connecting pipe (4), wherein the liquid collecting chamber cover (3) is connected to the upper end of the liquid collecting chamber (1), the control chamber (2) is connected to the upper end of the liquid collecting chamber cover (3), and the connecting pipe (4) is connected to the upper end of the control chamber (2); It is characterized in that A precision liquid collecting bin (101) is arranged inside the liquid collecting bin (1), and the precision liquid collecting bin (101) and the liquid collecting bin (1) are in communication with each other; The control chamber (2) and the liquid collecting chamber cover (3) are connected in a detachable manner. A display screen fixing opening (210) and a plurality of button holes (208) are provided on the control chamber (2). A display screen (201) is installed at the display screen fixing opening (210), and control buttons are installed in the button holes (208); A negative pressure pump (11) and electronic components are installed inside the control chamber (2); the negative pressure pump (11), control buttons, display screen (201) and electronic components are electrically connected; a connector (209) is fixedly connected to the upper end of the control chamber (2); one end of the connecting pipe (4) and the connector (209) are plugged into each other; The joint (209) is provided with an annular hole (2091), a liquid inlet port (2092) and a central cavity (2093) inside, the liquid inlet port (2092) and the connecting pipe (4) are in communication with each other, the central cavity (2093) is arranged between the liquid inlet port (2092) and the annular hole (2091), the liquid inlet port (2092) and the annular hole (2091) are in communication with each other through the central cavity (2093), and a one-way liquid guide membrane A (2094) is installed inside the liquid inlet port (2092); The upper end of the liquid collecting bin cover (3) is fixedly connected to a liquid suction head (302), one end of the liquid suction head (302) is interconnected with the negative pressure pump (11), an anti-backflow mechanism (10) is installed between the connecting pipe (4) and the liquid suction head (302), the anti-backflow mechanism (10) comprises a connecting ring (1001) and a connecting plug (1002), the connecting ring (1001) is screwed to the annular hole (2091) and the liquid suction head (302) by means of threads, an elastic member (10011) is fixedly connected to the inner side wall of the connecting ring (1001), a sealing protrusion (10012) is integrally connected to the upper end of the elastic member (10011), and the position of the sealing protrusion (10012) corresponds to the position of the annular hole (2091).

2. A medical negative pressure suction device with an anti-backflow structure according to claim 1, characterized in that: The other end of the connecting tube (4) is connected to a single straight-through joint (5), which is used to be connected to the suction tube. A Robert clamp (6) is provided on the connecting tube (4).

3. The medical negative pressure suction device with anti-backflow structure according to claim 1, characterized in that: The electronic components include a main board (12), a liquid level sensor (13), a battery (14) and a solenoid valve (15); the liquid level sensor (13), the battery (14) and the solenoid valve (15) are all electrically connected to the main board (12).

4. The medical negative pressure suction device with anti-backflow structure according to claim 1, characterized in that: The bottom of the liquid collecting bin cover (3) is fixedly connected to a negative pressure pump mounting seat (9), and a negative pressure pump limiting groove (901) for fixing the negative pressure pump (11) is provided on the negative pressure pump mounting seat (9).

5. The medical negative pressure suction device with anti-backflow structure according to claim 4, characterized in that: Two battery fixing plates (303) are fixedly connected to the upper end of the liquid collecting bin cover (3), and the battery fixing plates (303) are used to fix the battery (14).

6. The medical negative pressure suction device with anti-backflow structure according to claim 1, characterized in that: The bottom of the connecting plug (1002) is plugged into the liquid pipetting head (302), and a one-way liquid guide membrane B (10021) is installed inside the connecting plug (1002).

7. The medical negative pressure suction device with anti-backflow structure according to claim 1, characterized in that: A limiting frame (8) is arranged between the liquid collecting bin cover (3) and the liquid collecting bin (1), the limiting frame (8) being used for limiting the position of the electronic components, a mainboard fixing slot (802) being provided on the limiting frame (8), a plurality of plugging posts (801) being fixedly connected to the bottom of the limiting frame (8), a plurality of positioning cylinders (301) being fixedly connected to the upper end of the liquid collecting bin cover (3), the positions of the positioning cylinders (301) corresponding to the positions of the plugging posts (801), and the plugging posts (801) and the positioning cylinders (301) being plugged into each other.

8. The medical negative pressure suction device with anti-backflow structure according to claim 7, characterized in that: A handle (202) is fixedly connected to the control compartment (2), a plurality of screw holes (207) are provided on the control compartment (2), fixing screws (7) are installed in the screw holes (207), and the fixing screws (7) and the limiting frame (8) are screwed and fixed to each other.

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