A gastric drainage tube and gastric content negative pressure suction assembly

Abstract

This invention discloses a negative pressure suction assembly for gastric contents, comprising a pulsed negative pressure suction device and a gastric drainage tube. The gastric drainage tube includes a tube body with an inlet at the front end and an outlet at the rear end for connecting to the pulsed negative pressure suction device. A self-driven rotary cutter is located within the tube body, comprising a main body that rotatably engages with the tube body. The main body has a central channel, and the inner wall of the central channel has a guide for converting part of the kinetic energy of the fluid within the central channel into the kinetic energy required for the rotation of the main body. A blade holder is mounted on the main body, and a blade is fixed on the blade holder. The main body drives the blade to periodically move to the inlet to cut off gastric contents retained at the inlet. This invention provides a gastric drainage tube and a negative pressure suction assembly for gastric contents, which can reduce or even avoid gastric contents clogging the tube opening during negative pressure suction, resulting in high efficiency in negative pressure suction of gastric contents.

Description

Technical Field

[0001] This invention relates to the technical field of instruments related to drainage in clinical surgery, specifically a gastric drainage tube and a negative pressure suction assembly for gastric contents. Background Technology

[0002] In gastric surgeries, it is often necessary to aspirate the stomach contents to obtain a better surgical view. Current gastric aspiration methods utilize conventional gastric drainage tubes. However, during negative pressure aspiration, the tube opening frequently becomes blocked by stomach contents, often consisting of indigestible coarse fibers from food residue. In such cases, the gastric drainage tube must be removed, the opening cleaned externally, and then reinserted into the stomach. This process is repeated several times until the stomach contents are reduced to the minimum required for surgery.

[0003] Clearly, in the current technology, blockage of the gastric drainage tube will greatly reduce the efficiency of gastric contents aspiration and increase the operation time. Within the limited operation time, the surgeon can only complete the operation under poor surgical field conditions, which affects the operation results. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the technical problems in the related art: to provide a gastric drainage tube and a negative pressure suction component for gastric contents, which can reduce or even avoid gastric contents blocking the tube opening during negative pressure suction, thereby making the negative pressure suction efficiency of gastric contents high.

[0005] Therefore, one object of the present invention is to provide a gastric drainage tube, which includes a tube body, a fluid inlet at the front end of the tube body, and a fluid outlet at the rear end of the tube body for connecting to a pulsed negative pressure suction device. The tube body is provided with a self-driven rotary cutter, which includes a cylindrical body that is rotatably fitted with the tube body and axially confined within the tube body. The body has a central channel for fluid to pass through the tube body. The inner wall of the central channel is provided with a guide for converting part of the kinetic energy of the fluid in the central channel into the kinetic energy required for the rotation of the body. The body is provided with a blade holder, on which a blade is fixed. The body drives the blade to rotate around the axis of the tube body, so that the blade can periodically move into the fluid inlet to cut off the gastric contents retained in the fluid inlet. First, the self-driven rotary cutter can cut off the gastric contents stuck at the inlet, thereby reducing the retention of gastric contents at the inlet and avoiding blockage. Second, the self-driven rotary cutter is powered by the fluid flow generated by negative pressure suction, eliminating the need for external drive equipment or cables to drive the main body to rotate inside the tube, thus simplifying the overall structure. Third, the pulsed negative pressure suction allows the blade on the cutter holder to have a momentarily increased shearing force when it cuts into the gastric contents, even if it does not cut instantly, the repeated pulses will eventually gradually cut off the gastric contents.

[0006] Optionally, the liquid inlet is located on the side of the front end of the pipe body, and there are multiple liquid inlets, which are evenly distributed along the circumference of the pipe body.

[0007] Optionally, there are two inlets. Two inlets not only increase the area of ​​the inlets, but also maintain the flow of fluid in the tube when there is too much gastric contents on one inlet and it becomes blocked in a short time. This allows the main body to maintain a pulsed driving force for rotation, which eventually causes the blade to gradually cut off the gastric contents on the inlet.

[0008] Optionally, the blade holder is configured to fit against the inner wall of the tube's front end. The blade holder has a toothed groove at the position corresponding to the inlet, and the blade is located within the toothed groove. The cutting edge of the blade is positioned within the toothed groove along its depth direction. Therefore, when the inlet touches the stomach wall, the blade holder rotates and touches the stomach wall without scratching it. Since the stomach contents are mostly strip-shaped, they can be cut by the blade when inserted into the toothed groove.

[0009] Optionally, the inner wall of the tube body is provided with an annular groove around the liquid inlet, and a sharp scraping edge is formed between the groove and the inner wall of the tube body. On the one hand, the scraping edge can remove the attached substances on the outer surface of the knife holder, preventing the attached substances from getting stuck between the knife holder and the inner wall of the tube body and affecting the rotation of the knife holder; on the other hand, the scraping edge is located on the inner wall of the tube body and will not scratch the stomach wall.

[0010] Optionally, the main body is tubular, and the flow guide is a plurality of flow guide blades fixed on the inner sidewall of the main body.

[0011] Optionally, the main body is tubular, and the flow guide is a flow guide strip that extends spirally along the axial direction of the main body. The flow guide strip and the main body are an integral structure, and the flow guide strip has a front force-bearing surface for bearing the force generated by the fluid flow.

[0012] Optionally, the main body is provided with a hanger rod, the lower end of which is fixed to the main body, and the upper end of which extends axially and is fixed to the front end of the tube. The tool holder has a clearance hole for the hanger rod to pass through. The hanger rod allows the main body to be axially limited and circumferentially rotated within the tube.

[0013] Optionally, the boom sleeve is provided with a movable body, which is a spindle-shaped structure with the diameters at both ends smaller than the diameter in the middle. A spring is provided below the movable body and sleeved on the boom. The two ends of the spring are fixed to the movable body and the shoulder at the lower end of the boom, respectively.

[0014] Therefore, another object of the present invention is to provide a negative pressure suction assembly for gastric contents, which includes a pulsed negative pressure suction device and the above-mentioned gastric drainage tube. The pulsed negative pressure suction device includes a vacuum pump and a proportional valve. The vacuum pump is connected to the outlet of the tube through the proportional valve. The proportional valve is configured to periodically change the negative pressure suction applied by the vacuum pump to the fluid in the tube in a pulsed manner.

[0015] The above technical solution has the following advantages or beneficial effects: First, the self-driven rotary cutter inside the tube can rotate under the drive of the fluid, thereby cutting off the gastric contents retained at the inlet and reducing the blockage caused by the continuous accumulation of gastric contents at the inlet; Second, the self-driven rotary cutter converts part of the kinetic energy of the fluid into the kinetic energy of the main body rotation by means of a guide, so there is no need to set up an external drive device or add a cable inside the tube to connect to the external drive device, simplifying the structure of the gastric drainage tube; Third, the use of a pulsed negative pressure suction device to provide periodic pulsed negative pressure suction allows the blade on the cutter holder to gradually cut the gastric contents even if it cannot cut them off in one cut, thanks to the large instantaneous rotational force provided by the periodic pulses; Fourth, the inlet of the tube... There are two inlets. Even if one inlet is blocked by too much gastric contents, the other inlet can still keep the fluid continuously drawn into the tube. This allows the self-driven rotary cutter to have continuous pulsed rotational power, ultimately cutting off the gastric contents blocking the inlet. Finally, the central channel is equipped with a shuttle-shaped movable body. This movable body can form a narrow area between the middle position and the adjacent guide strip, so that the pressure increases when the fluid passes through the narrow area, increasing the force of the fluid on the front force surface of the guide strip. On the other hand, the movable body can move up and down with the pulse, so that the narrow area is constantly changing, preventing the gastric contents in the tube from accumulating in the narrow area. In addition, when the movable body moves upward, it can scrape off a small amount of gastric contents wrapped around the hanger, preventing the gastric contents from continuously wrapping around the hanger.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the negative pressure suction component for gastric contents of the present invention.

[0018] Figure 2 for Figure 1 A schematic diagram of the structure of the gastric drainage tube at the front end of the tube body.

[0019] Figure 3 for Figure 2 Side view of the gastric drainage tube.

[0020] Figure 4 for Figure 3 A cross-sectional view along the "AA" direction.

[0021] Figure 5 for Figure 4 A cross-sectional view along the "BB" direction.

[0022] Figure 6 for Figure 5 A magnified view of a portion of the "C" region.

[0023] Figure 7 This is a schematic diagram of the explosion and disassembly of the gastric drainage tube of the present invention.

[0024] Figure 8 for Figure 2 A schematic diagram of the self-driven rotary cutter inside the central tube after rotating 90°.

[0025] Figure 9 for Figure 8 Side view of the gastric drainage tube.

[0026] Figure 10 for Figure 9 A magnified view of a portion of the "D" region.

[0027] Figure 11 for Figure 9 A cross-sectional view along the "EE" direction.

[0028] Figure 12 for Figure 11 A cross-sectional view along the "FF" direction.

[0029] The components include: 1. Pipe body; 1.1. Liquid inlet; 2. Main body; 2.1. Central channel; 3. Guide bar; 3.1. Front force-bearing surface; 4. Knife holder; 5. Blade; 6. Toothed groove; 7. Groove; 8. Scraper; 9. Hanging rod; 10. Moving body; 11. Spring; 12. Pulsed negative pressure suction device; 13. Fixed frame. Detailed Implementation

[0030] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0031] The following describes in detail, with reference to the accompanying drawings, an embodiment of the gastric drainage tube and a negative pressure suction assembly for gastric contents according to the present invention.

[0032] Food residue in the stomach can obscure the surgical field during endoscopic surgery. When using negative pressure drainage tubes to aspirate gastric contents, the problem of blockage arises. While small amounts of bezoars can be broken up endoscopically, there are no effective solutions for stringy, coarse fibers in the gastric contents. Current clinical procedures typically involve adjusting the position of the suction tube to avoid this blockage, thus reducing the likelihood of fiber clogging. However, this approach requires careful adjustment of the suction process and limits the suction force, increasing the procedure time. Furthermore, the inability to completely aspirate the contents inevitably affects the surgical field, complicating the procedure.

[0033] Example 1 This invention provides a gastric drainage tube, as shown in the figure. It includes a tube body 1, which is a hollow, elongated strip structure extending axially. The front end of the tube body 1 has a liquid inlet 1.1, and the rear end of the tube body 1 has a liquid outlet. The liquid outlet is configured to connect to the negative pressure suction interface of a pulsed negative pressure suction device 12 to generate negative pressure suction to aspirate fluid from the tube body 1. A self-driven rotary cutter is provided inside the tube body 1 near the liquid inlet 1.1. The self-driven rotary cutter is rotatably fitted inside the tube body 1 and has a blade extending to the location of the liquid inlet 1.1, so that the self-driven rotary cutter can rotate in response to the flow of fluid inside the tube body 1, and during the rotation, the blade can cut the gastric contents retained on the liquid inlet 1.1.

[0034] In this embodiment, the pulsed negative pressure suction device 12 refers to the general term for devices in the prior art that generate negative pressure suction and that the negative pressure suction can be changed periodically in a pulse manner. This pulsed negative pressure suction device 12 is a commercially available product commonly used in existing negative pressure suction devices, such as a medical pulsed suction device with announcement number CN 215386236U.

[0035] In this embodiment, gastric contents refer to food residue remaining in the patient's stomach, including but not limited to coarse fiber from food.

[0036] On the one hand, the pulsed suction force generated by the external pulsed negative pressure suction device 12 causes the fluid inside the tube 1 to flow in a pulsed manner. This not only drives the self-driven rotary cutter to rotate and cut the gastric contents at the inlet 1.1, but also allows the self-driven rotary cutter to have a large instantaneous rotational force when there is a large amount of gastric contents, making it easier to cut the difficult-to-cut parts of the gastric contents, such as tough coarse fibers. On the other hand, the self-driven rotary cutter at the front end of the entire gastric drainage tube is driven by the force generated by the fluid flow inside the tube 1, so there is no need to rely on an external driving force to rotate. Compared with various existing medical rotary cutters, the gastric drainage tube of this embodiment eliminates the need for an additional cable inside the tube 1 and the need to consider the connection between the cable and the external driving device. That is, the structure of the gastric drainage tube is simple, and it can simultaneously perform suction and rotary cutting functions.

[0037] Example 2 Based on the preferred embodiment described above, the self-driven rotary cutter includes a cylindrical body 2 that matches the inner cavity of the tube body 1. The body 2 is axially positioned within the tube body 1 near the inlet 1.1, and the body 2 is rotatably fitted with the tube body 1. The body 2 has a central channel 2.1 for the fluid in the tube body 1 to pass through, thereby allowing the fluid drawn in from the inlet 1.1 to enter the tube body 1 through the central channel 2.1 and then be drawn out from the outlet by an external pulse-type negative pressure suction device 12. The inner wall of the central channel 2.1 is provided with a flow guide that contacts the fluid. The flow guide is configured to convert part of the kinetic energy of the fluid in the central channel 2.1 into the kinetic energy required for the rotation of the body 2, thereby causing the body 2 to rotate when the fluid passes through the central channel 2.1. The main body 2 is provided with a knife holder 4 extending toward the location of the inlet 1.1. A blade 5 is fixed on the knife holder 4. The knife holder 2 and the blade 5 constitute the knife in Embodiment 1. The main body 2 drives the knife holder 4 and the blade 5 on the knife holder 4 to rotate together around the axis of the tube 1, so that the blade 5 can periodically move into the inlet 1.1 to cut off the gastric contents retained in the inlet 1.1.

[0038] Compared to existing negative pressure suction tubes, the gastric drainage tube in this embodiment only adds a self-driven rotary cutter inside the tube near the front end, and replaces the conventional external vacuum pump with a pulse-type negative pressure suction device 12 with pulse suction function. This effectively solves the problem of blockage at the inlet 1.1 when suctioning gastric contents from the patient's stomach. When a clump of gastric stones blocks the inlet 1.1, the rotating blade can use its own rotational inertia to push the stone away. After long strips of coarse fiber are sucked into the inlet 1.1, the rotating blade 4 can periodically cut the coarse fiber, effectively avoiding the problem of the coarse fiber being stuck in the inlet 1.1 with one part inside the tube 1 and the other part outside the tube 1, ensuring smooth suction of the inlet 1.1. In addition, since there is no cable extending along the tube 1 inside the tube in this embodiment, and the coarse fiber sucked into the tube 1 is cut into several small segments, there is no problem of coarse fiber getting tangled in the cable.

[0039] Example 3 Based on the preferred embodiments described above, such as Figure 4 As shown, the liquid inlet 1.1 is located on the side of the front end of the pipe body 1, and there are multiple liquid inlets 1.1, which are evenly distributed along the circumference of the pipe body 1.

[0040] Preferably, such as Figure 4 As shown, there are two inlets 1.1. The two inlets 1.1 are symmetrically arranged along the longitudinal section containing the center line of the front end of the tube body 1. In this embodiment, the two inlets 1.1 not only improve the suction efficiency, but more importantly, when one inlet 1.1 is blocked by a large amount of gastric contents, the other inlet 1.1 can ensure the flow of fluid within the tube body 1, allowing the self-driven rotary cutter to still rotate under the action of the fluid. Through the pulsed negative pressure suction provided by the pulsed negative pressure suction device 12, the self-driven rotary cutter can obtain a large driving force at the pulse peak to cut the coarse fibers retained on the inlet 1.1. In this embodiment, the pulse peak refers to the instantaneous maximum value of the negative pressure suction provided by the pulsed negative pressure suction device 12.

[0041] Example 3 In a preferred embodiment, the blade holder 4 is configured to fit against the inner wall of the front end of the tube body 1, and the blade holder 4 has a toothed groove 6 at the position corresponding to the liquid inlet 1.1, with the blade 5 located in the groove of the toothed groove 6.

[0042] Optionally, there are multiple toothed grooves 6, arranged sequentially at intervals. The blade 5 is a strip-shaped structure, fixed to the blade holder 4 by mounting bolts and fitting against one side of the blade holder 4 in the thickness direction. The projection of the position of the blade 5 on its corresponding toothed groove 6 onto the blade holder 4 is located within the groove of the toothed groove 6. Thus, the cutting edge of the blade 5 is hidden within the toothed groove 6 along its depth direction. In this embodiment, even if the inlet 1.1 touches the stomach wall, the blade 5 will not damage the stomach wall during the rotation of the blade holder 4. Furthermore, the strip-shaped coarse fibers can be inserted into the toothed groove 6 as the blade holder 4 rotates and cut by the blade 5 located within the toothed groove 6.

[0043] Example 4 Based on the preferred embodiments described above, such as Figures 4-6 As shown, an annular groove 7 is provided on the inner wall of the tube body 1 around the inlet 1.1, and a sharp scraping edge 8 is formed between the groove 7 and the inner wall of the tube body 1. In this embodiment, the groove 7 and the scraping edge 8 are located on the inner side of the tube body 1 at the location of the inlet 1.1, so the sharp scraping edge 8 will not cause scratches to the stomach wall. As the blade holder 4 rotates, on the one hand, the scraping edge 8 can scrape away contaminants on the outer wall of the blade holder 4, preventing foreign objects in the stomach from entering between the blade holder 4 and the tube body 1, so that the blade holder 4 can rotate smoothly while adhering to the inner wall of the tube body 1; on the other hand, the shearing force formed between the scraping edge 8 and the blade holder 4 can also cut off some coarse fibers.

[0044] Example 5 Based on the preferred embodiments described above, such as Figure 7 As shown, the front end of the tube body 1 is sealed to form a semi-circular end, and the two sides of the tube body 1 are internally cut to form liquid inlets 1.1. The two ends of the knife holder 4 are fixed to the main body 2, and the middle part of the knife holder 4 is arched to form an arc-shaped structure that matches the inner wall of the tube body 1. In this embodiment, as the main body 2 rotates inside the tube body 1, the knife holder 4 remains in contact with the inner wall of the tube body 1.

[0045] Example 6 Based on the preferred embodiment of the above embodiments, the main body 2 is tubular, and a central channel 2.1 extending axially is provided at the center of the main body 2.

[0046] Optionally, the guide element is a plurality of guide vanes fixed on the inner wall of the main body 2. During the flow of fluid from the inlet 1.1 through the central channel 2.1 towards the outlet, the fluid exerts a thrust on the guide vanes, thereby causing the main body 2 to have a tendency to rotate circumferentially. Furthermore, the torque force of the rotation of the main body 2 is proportional to the fluid velocity and flow rate. In this embodiment, after the outlet at the rear end of the tube 1 is connected to the negative pressure suction interface of the pulsed negative pressure suction device 12, the pulsed negative pressure suction force provided by the pulsed negative pressure suction device 12 will give the inner cavity of the tube 1 a large instantaneous negative pressure suction force, which helps the main body 2 to have a large instantaneous rotational torque, facilitating the blade 5 to have a large instantaneous shearing force when cutting into coarse fibers.

[0047] Optionally, such as Figure 4 and Figure 11 As shown, the flow guide is a flow guide strip 3 that extends spirally along the axial direction of the main body 2. The flow guide strip 3 and the main body 2 are an integral structure. The flow guide strip 3 has a front force-bearing surface 3.1 for bearing the force generated by the fluid flow. When the fluid in the pipe body 1 flows from the inlet 1.1 to the outlet, the front force-bearing surface 3.1 is opposite to the flow direction of the fluid.

[0048] Example 7 Based on the preferred embodiment described above, the main body 2 is provided with a hanging rod 9, the lower end of the hanging rod 9 is fixed to the main body 2, the upper end of the hanging rod 9 extends axially and is fixed to the front end of the tube body 1, and the knife holder 4 has a clearance hole for the hanging rod 9 to pass through.

[0049] Optionally, the lower end of the main body 2 is provided with an annular fixing frame 13, which is fixed to the lower end of the main body 2. The lifting rod 9 is rotatably engaged with the middle position of the fixing frame 13. The fixing frame 13 has several through holes for fluid to pass through. It should be understood that in this embodiment, the fixing frame 13 rotates synchronously with the main body 2. Therefore, the connection between the lower end of the lifting rod 9 and the fixing frame 13 can be connected by a bearing, so that the fixing frame 13 and the lifting rod 9 are rotatably engaged.

[0050] Optionally, the lower end of the main body 2 is provided with an annular fixing frame 13, and the fixing frame 13 is rotatably engaged with the lower end of the main body 2 via a bearing. The hanging rod 9 is fixedly connected to the middle position of the fixing frame 13. The fixing frame 13 has several through holes for fluid to pass through. It should be understood that in this embodiment, both the fixing frame 13 and the hanging rod 9 are stationary relative to the pipe body 1, while the main body 2 rotates relative to the pipe body 1. Therefore, the connection between the lower end of the main body 2 and the fixing frame 13 can be connected by a bearing, so that the fixing frame 13 and the main body 2 are rotatably engaged.

[0051] Example 8 Based on the preferred embodiment 7 described above, the boom 9 is fitted with a movable body 10. The movable body 10 has a spindle-shaped structure with diameters at both ends smaller than its middle diameter. A spring 11 is fitted around the boom 9 below the movable body 10, and both ends of the spring 11 are fixed to the shoulders of the movable body 10 and the lower end of the boom 9, respectively. Specifically, the upper end of the spring 11 is fixed to the lower end of the movable body 10, and the lower end of the spring 11 is fixed to the shoulder of the boom 9. In this embodiment, the spindle shape refers to the spindle-shaped structure in the longitudinal section of the movable body 10. This spindle-shaped structure rotates around a central axis to form a three-dimensional movable body 10 with smaller ends and a larger middle.

[0052] like Figure 11 As shown, the middle position of the movable body 10 and the guide strip 3 are adjacent to a narrow region with a small gap. When the fluid passes through this narrow region, it can generate greater pressure, thereby applying a greater thrust to the front force-bearing surface 3.1 on the guide strip 3. Furthermore, in this embodiment, the tube 1 is connected to a pulsed negative pressure suction device 12. The negative pressure suction applied by the pulsed negative pressure suction device 12 to the tube 1 is pulsed, so the fluid flow also changes periodically in speed. At this time, the downward thrust applied by the fluid to the outer surface of the movable body 10 also changes periodically, causing the movable body 10 to move up and down against the elastic force of the spring 11. At this time, the axial position of the movable body 10 relative to the main body 2 changes back and forth. This makes the axial position of the middle position of the movable body 10 with a larger diameter fluctuate within the main body 2. Thus, the narrow region between the middle position of the movable body 10 and the guide strip 3 can change position as the movable body 10 moves, preventing clumps of gastric contents from getting stuck in this narrow region. Therefore, in this embodiment, the movable body 10 of the spindle structure not only allows the fluid to exert a greater force on the guide strip 3, but also facilitates the smooth passage of gastric contents through the intermediate channel 2.1 as the axial position of the movable body 10 oscillates back and forth.

[0053] In addition, such as Figure 11 As shown, when the gastric contents inhaled through the inlet 1.1 flow in a spiral motion with the fluid, a small portion of the gastric contents will become entangled on the hanger 9. The reciprocating motion of the movable body 10 can scrape off the small amount of gastric contents entangled on the hanger 9, thus preventing the gastric contents from entangled and accumulating on the hanger.

[0054] Example 9 A negative pressure suction assembly for gastric contents includes a pulsed negative pressure suction device 12 and a gastric drainage tube as described in the above embodiments. The pulsed negative pressure suction device 12 includes a vacuum pump and a proportional valve. The suction port of the vacuum pump is connected to the outlet of the tube 1 through the proportional valve. The proportional valve is configured to periodically change the negative pressure suction applied by the vacuum pump to the fluid in the tube 1 in a pulsed manner.

[0055] Optionally, the outlet of the gastric drainage tube is connected to both the pulse-type negative pressure suction device 12 and the water pump via a three-way solenoid reversing valve. The gastric drainage tube can be used for two purposes by controlling the reversing of the three-way solenoid reversing valve. When the gastric drainage tube is connected to the pulse-type negative pressure suction device 12, it can perform negative pressure suction; when connected to the water pump, it can be used as a water injection tube. Figure 4 As shown, during the upward flow of water supplied by the pump, the water flow will drive the moving body 10 to overcome the elastic force of the spring 11 and move upward. At this time, the middle position of the moving body 10 is located outside the central channel 2.1, increasing the cross-sectional area of ​​the central channel 2.1.

[0056] It should be noted that in the description of this invention, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0057] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0058] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0059] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0060] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0061] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

[0062] For those skilled in the art, various changes and modifications will undoubtedly be apparent after reading the above description. Therefore, the appended claims should be construed as covering all changes and modifications that encompass the true intent and scope of the invention. Any and all equivalent scope and content within the scope of the claims should be considered to remain within the intent and scope of the invention.

Claims

1. A gastric drainage tube, comprising a tube body (1), an inlet (1.1) at the front end of the tube body (1), and an outlet for connecting a pulsed negative pressure suction device (12) at the rear end of the tube body (1), characterized in that: a self-driven rotary cutter is provided inside the tube body (1), the self-driven rotary cutter comprising a cylindrical body (2), the body (2) being rotatably fitted with the tube body (1) and axially confined within the tube body (1), the body (2) having a central channel (2.1) for fluid to pass through the tube body (1), a guide for converting part of the kinetic energy of the fluid in the central channel (2.1) into the kinetic energy required for the rotation of the body (2) on the inner wall of the central channel (2.1), a blade holder (4) being provided on the body (2), a blade (5) being fixed on the blade holder (4), the body (2) driving the blade (5) to rotate around the axis of the tube body (1), so that the blade (5) can periodically move to the inlet (1.1). 1.1) inside, used to cut off the stomach contents that remain on the inlet (1.1).

2. The gastric drainage tube according to claim 1, characterized in that: The liquid inlet (1.1) is located on the side of the front end of the pipe body (1), and there are multiple liquid inlets (1.1), which are evenly distributed along the circumference of the pipe body (1).

3. The gastric drainage tube according to claim 2, characterized in that: There are two liquid inlets (1.1).

4. The gastric drainage tube according to claim 3, characterized in that: The blade holder (4) is configured to fit against the inner side wall of the front end of the tube body (1). The blade holder (4) has a toothed groove (6) at the position corresponding to the liquid inlet (1.1), and the blade (5) is located in the groove of the toothed groove (6).

5. The gastric drainage tube according to claim 4, characterized in that: The inner wall of the tube (1) is provided with an annular groove (7) around the liquid inlet (1.1), and a sharp scraping edge (8) is formed between the groove (7) and the inner wall of the tube (1).

6. The gastric drainage tube according to claim 3, characterized in that: The main body (2) is tubular, and the guide element is a number of guide blades fixed on the inner side wall of the main body (2).

7. The gastric drainage tube according to claim 3, characterized in that: The main body (2) is tubular, and the guide is a guide strip (3) that extends spirally along the axis of the main body (2). The guide strip (3) and the main body (2) are an integral structure. The guide strip (3) has a front force-bearing surface (3.1) for bearing the force generated by the fluid flow.

8. The gastric drainage tube according to claim 7, characterized in that: The main body (2) is provided with a hanging rod (9). The lower end of the hanging rod (9) is fixed to the main body (2), and the upper end of the hanging rod (9) extends axially and is fixed to the front end of the tube (1). The knife holder (4) has a clearance hole for the hanging rod (9) to pass through.

9. The gastric drainage tube according to claim 8, characterized in that: The boom (9) is fitted with a movable body (10), which is a spindle-shaped structure with diameters at both ends smaller than the diameter in the middle. A spring (11) is fitted around the boom (9) below the movable body (10), and the two ends of the spring (11) are fixed to the shoulders of the lower ends of the movable body (10) and the boom (9), respectively.

10. A negative pressure suction assembly for gastric contents, characterized in that: The device includes a pulsed negative pressure suction device (12) and a gastric drainage tube according to any one of claims 1-9. The pulsed negative pressure suction device (12) includes a vacuum pump and a proportional valve. The vacuum pump is connected to the outlet of the tube body (1) through the proportional valve. The proportional valve is configured to periodically change the negative pressure suction applied by the vacuum pump to the fluid in the tube body (1) in a pulsed manner.

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