A lavage device for pediatric treatment of the digestive tract

Abstract

This invention belongs to the field of medical device technology, specifically relating to a pediatric gastrointestinal lavage device. The device includes a gastric lavage machine body with a placement groove inside. A flushing connector is located at the upper end of the placement groove. It also includes a gastric tube comprising an inner tube and an outer tube. The inner tube is sleeved on the outside of the flushing connector, and the outer tube is coaxially disposed on the outside of the inner tube. The sidewall of the inner tube has multiple flow-blocking holes spaced evenly along the axial direction. These flow-blocking holes are composed of multiple clearance holes located in the same radial cross-section. This invention, by setting an elastic flow-blocking membrane adapted to the flow-blocking hole array on the inner tube, allows the device to automatically reduce the effective flow diameter of the tube when the negative pressure exceeds a threshold, achieving precise flow restriction and pressure reduction, and preventing damage to the delicate gastric mucosa of children due to high negative pressure.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, specifically relating to an irrigation device for pediatric digestive tract treatment. Background Technology

[0002] In pediatric clinical treatment, gastrointestinal diseases are common in children. When children experience food poisoning, foreign body residue in the stomach, severe vomiting, or gastritis, gastric lavage is an important clinical intervention. Its core purpose is to quickly relieve the child's symptoms and remove pathogenic factors by precisely injecting lavage fluid and expelling residual substances from the stomach, thus laying the foundation for subsequent treatment. Pediatric gastrointestinal lavage devices, as the core medical equipment for achieving this operation, have been widely used in pediatric clinical diagnosis and treatment due to their convenience and practicality, becoming one of the key tools for protecting children's digestive health and reducing disease risks.

[0003] However, existing pediatric gastric lavage devices on the market still have many shortcomings. The most prominent problem is that excessive negative pressure can easily occur during the lavage process, leading to damage to the child's gastric mucosa. The reason for excessive negative pressure is mainly because the negative pressure adjustment mechanism of existing devices is not precise enough. Most of them adopt a fixed negative pressure mode and do not fully adapt to the child's age, weight differences, and gastric physiological state. They also lack effective negative pressure buffering and real-time monitoring functions. At the same time, the suction tube design of some devices is unreasonable, which can easily lead to problems such as tube blockage and air leakage at the interface. This causes the negative pressure system to passively increase the negative pressure to maintain the preset suction. Since the child's gastric mucosa is more delicate than that of an adult, and the mucosal barrier function is not yet fully developed, excessive negative pressure can damage the mucosal tissue like a strong pull, causing complications such as mucosal congestion and bleeding, increasing the child's treatment pain and the difficulty of clinical care.

[0004] In summary, pediatric gastric lavage procedures place extremely high demands on the safety, precision, and adaptability of the equipment. Existing lavage devices suffer from problems such as inaccurate negative pressure regulation, lack of effective buffering and monitoring mechanisms, and unreasonable tubing design, leading to excessive negative pressure that can easily damage the gastric mucosa in children, thus failing to fully meet the safe diagnostic and treatment needs of pediatric clinical practice. Therefore, developing a pediatric gastrointestinal lavage device that is adapted to the physiological characteristics of children and addresses the shortcomings of existing technologies has significant clinical application value and practical significance. Summary of the Invention

[0005] The purpose of this invention is to provide a pediatric gastrointestinal irrigation device. By setting an elastic flow-blocking membrane (31) adapted to the flow-blocking array on the inner catheter (21), the device automatically reduces the effective flow diameter of the catheter when the negative pressure exceeds the threshold, thereby achieving precise flow restriction and pressure reduction, and avoiding damage to the delicate gastric mucosa of children due to high negative pressure.

[0006] The specific technical solution adopted by this invention is as follows: A pediatric gastrointestinal tract lavage device includes a gastric lavage machine body, the interior of which has a placement groove, and the upper end of the placement groove has a flushing connector. It also includes: A gastric tube for drainage, comprising an inner tube and an outer tube, wherein the inner tube is sleeved on the outside of the irrigation connector, and the outer tube is coaxially disposed on the outside of the inner tube; the sidewall of the inner tube is provided with a plurality of flow-blocking holes at equal intervals along the axial direction, the flow-blocking holes being composed of a plurality of clearance through holes located in the same radial cross section; the inner tube and the outer tube constitute a hollow sandwich tube structure. Multiple flow-blocking modules, each including a flow-blocking membrane, the flow-blocking membrane being fixed to the outside of the inner conduit and located inside the outer conduit, and the multiple flow-blocking modules and multiple flow-blocking aperture arrays being adapted to each other; During the irrigation of a child's digestive tract, when the negative pressure inside the inner catheter exceeds a threshold, the flow-blocking membrane bulges towards the central axis of the inner catheter and changes from its initial state to a flow-blocking state. This reduces the effective flow diameter inside the inner catheter, thereby achieving flow restriction and pressure reduction.

[0007] In a preferred embodiment, the clearance holes in two adjacent flow-blocking orifice arrays are offset along the axial direction of the inner guide tube.

[0008] In a preferred embodiment, the material of the flow-blocking membrane is any one of the following: medical liquid silicone, medical polyurethane film [TPU], and medical thermoplastic elastomer [TPE]. In this embodiment, the material of the flow-blocking membrane is preferably medical polyurethane film.

[0009] In a preferred embodiment, the thickness of the flow-blocking membrane ranges from 0.1 mm to 1 mm, the elongation at break is >300%, and the Shore A hardness ranges from 20 to 60.

[0010] In a preferred embodiment, the thickness and Shore hardness of the choke membranes in the plurality of choke modules increase progressively from the end furthest from the gastric lavage machine body to the end closest to the gastric lavage machine body.

[0011] In a preferred embodiment, the flow-blocking module further includes two retaining rings and two support blocks. The two retaining rings are respectively fixed to both ends of the flow-blocking membrane, and the retaining rings are fixedly connected to the inner conduit. The flow-blocking membrane and the inner conduit are fixedly connected by retaining rings. The two support blocks are respectively fixed to the ends of the two retaining rings that are far apart from each other, and the outer wall of the support block is in contact with the inner wall of the outer conduit. The support block is configured to provide support for the outer conduit.

[0012] In a preferred embodiment, the support block has multiple air holes inside, and the hollow interlayer between the inner and outer conduits is divided into multiple chambers by the support block, and the multiple chambers are interconnected.

[0013] In a preferred embodiment, the inner diameter of the inner conduit is denoted as R, and the normal height of the flow-blocking membrane and the inner wall of the inner conduit in the flow-blocking state is denoted as H, where H ≤ 1 / 3 * R.

[0014] The technical effects achieved by this invention are as follows: This invention provides an elastic flow-blocking membrane with an adapted flow-blocking orifice array on the inner catheter, which enables the device to automatically reduce the effective flow diameter of the catheter when the negative pressure exceeds the threshold, thereby achieving precise flow restriction and pressure reduction and preventing damage to the delicate gastric mucosa of children due to high negative pressure. This invention sets the thickness and Shore hardness of multiple flow-blocking membranes in a gradient increasing manner from the end away from the stomach to the end near the stomach, so that the device can achieve graded and precise response to negative pressure at different positions, forming a step-like pressure reduction mechanism, realizing refined and hierarchical control of negative pressure during irrigation, and improving the safety and stability of irrigation operation. This invention provides effective support for the outer conduit by setting a support block on the outside of the inner conduit that fits against the inner wall of the outer conduit and opening through holes and vents inside it, thus preventing the outer conduit from collapsing and deforming. It also ensures that the pressure in each chamber of the hollow interlayer is evenly distributed, enabling the flow-blocking membrane to respond sensitively and coordinately to changes in negative pressure, and ensuring the stable operation of the flow-limiting and pressure-reducing function. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a partial structural schematic diagram of the gastric tube of the present invention; Figure 3 This is a schematic diagram of the internal structure of the external catheter of the present invention; Figure 4 This is a partial structural cross-sectional view of the external catheter of the present invention; Figure 5 This is a schematic diagram of the flow-blocking module of the present invention; Figure 6 This is an exploded view of the flow-blocking module of the present invention; Figure 7 This is a schematic diagram of the flow-blocking membrane of the present invention in a flow-blocking state; Figure 8 This is a front view of the gastric tube when the flow-blocking membrane of the present invention is in a flow-blocking state.

[0016] The attached diagram lists the components represented by each number as follows: 10. Main body of the gastric lavage machine; 20. Gastric tube; 21. Internal catheter; 22. External catheter; 23. Clearance port; 30. Flow choke module; 31. Flow-blocking membrane; 32. Snap ring; 33. Support block; 34. Air pore. Detailed Implementation

[0017] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0018] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0019] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in a preferred embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that mutually excludes other embodiments.

[0020] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0021] Please see the appendix Figures 1 to 4 As shown, this is the first embodiment of the present invention. This embodiment provides a pediatric gastrointestinal tract lavage device, including a gastric lavage machine body 10. The gastric lavage machine body 10 has a placement groove inside, and a flushing connector is provided at the upper end of the placement groove. It also includes: The gastric tube 20 includes an inner tube 21 and an outer tube 22. The inner tube 21 is sleeved on the outside of the flushing connector, and the outer tube 22 is coaxially arranged on the outside of the inner tube 21. The sidewall of the inner tube 21 is provided with multiple flow-blocking holes at equal intervals along the axial direction. The flow-blocking holes are composed of multiple clearance holes 23 located in the same radial section. The inner tube 21 and the outer tube 22 constitute a hollow sandwich tube structure. Multiple flow-blocking modules 30, each including a flow-blocking membrane 31, which is fixed to the outside of the inner conduit 21 and located inside the outer conduit 22, and the multiple flow-blocking modules 30 and multiple flow-blocking aperture arrays are adapted to each other. During the irrigation of the child's digestive tract, when the negative pressure inside the inner catheter 21 is greater than the threshold, the flow-blocking membrane 31 bulges towards the central axis of the inner catheter 21 and changes from the initial state to the flow-blocking state, thereby reducing the effective flow diameter inside the inner catheter 21 and achieving flow restriction and pressure reduction.

[0022] It should be noted that the main body 10 of the gastric lavage machine is a mature existing technology. After the main body 10 of the gastric lavage machine is started, it can deliver or extract physiological saline flushing fluid into the patient through the gastric tube 20. Its specific working principle and working process can be referred to the existing technology, and will not be elaborated further here.

[0023] In this embodiment, when lavaging a child's stomach, a gastric tube 20 is delivered to the child's stomach, and the main body 10 of the gastric lavage machine is activated to lavage the stomach with saline. During the lavage process, when the negative pressure exceeds a set threshold, the negative pressure inside the inner catheter 21 increases. The flow-blocking membrane 31 bulges towards the central axis of the inner catheter 21 through the interior of the bypass hole 23, changing from the initial state to a flow-blocking state. The flow-blocking membrane 31 in the flow-blocking state compresses the space inside the inner catheter 21, reducing the effective flow diameter inside the inner catheter 21, thereby reducing the liquid flow rate per unit time and achieving the effect of flow restriction and pressure reduction. Specifically, in the initial state, the surface of the flow-blocking membrane 31 is flush with the inner catheter. The outer wall of the inner catheter 21 is basically fitted, and the passage hole 23 is kept unobstructed. At this time, the inner diameter of the inner catheter 21 is R, which ensures the normal progress of the irrigation operation. When the negative pressure inside the inner catheter 21 exceeds the set threshold due to other factors, since the inner catheter 21 and the outer catheter 22 form a hollow sandwich catheter, the pressure inside the outer catheter 22 is relatively stable. Under the action of pressure difference, the flow-blocking membrane 31 undergoes elastic deformation and bulges into the inner catheter 21 through the passage hole 23. This ensures that while limiting the flow and reducing the pressure, the inner catheter 21 still has a sufficient flow cross-sectional area to avoid poor drainage due to complete blockage. It can also effectively control the negative pressure within a safe range to prevent damage to the delicate gastric mucosa of children.

[0024] It should be noted that the main body 10 of the gastric lavage machine is a constant negative pressure gastric lavage device. Under the condition of constant suction negative pressure of the main body 10 of the gastric lavage machine, the bulging of the flow-blocking membrane 31 reduces the cross-sectional area of ​​the inner tube 21 (i.e., the effective flow inner diameter is reduced). The throttling of the tube will reduce the suction flow rate as the resistance increases, which will reduce the liquid suction flow rate (the gastric lavage machine is a constant negative pressure output system, and the Bernoulli effect of a sharp increase in flow velocity due to the reduction of cross-sectional area will not occur, thus slowing down the rate of increase of negative pressure in the stomach, thereby reducing the actual adsorption force on the gastric mucosa and avoiding damage to the mucosa by high-intensity adsorption; at the same time, the membrane seals the inner opening, which can prevent the gastric mucosa from being sucked into the tube orifice and causing shear damage. Secondly, please refer to it again. Figure 2 and Figure 7The clearance holes 23 in two adjacent flow obstruction arrays are misaligned along the axial direction of the inner guide tube 21.

[0025] In this embodiment, the clearance holes 23 in two adjacent flow-blocking hole arrays are staggered in the axial direction of the inner conduit 21. This scheme allows the flow-blocking membranes 31 corresponding to different flow-blocking hole arrays to bulge in sequence, and their projections in the axial direction of the inner conduit 21 can form staggered blocking areas, avoiding the formation of large-area bulges superimposed at the same axial position, thereby more evenly dispersing the resistance to the fluid inside the inner conduit 21.

[0026] In a specific embodiment, if the clearance through-holes 23 of a certain flow-blocking orifice array are uniformly distributed at 0°, 90°, 180°, and 270° on the radial cross section, then the clearance through-holes 23 of the next adjacent flow-blocking orifice array can be distributed at 45°, 135°, 225°, and 315°. When the flow-blocking membranes 31 of two adjacent flow-blocking orifice arrays bulge respectively, the bulges they form on the inner wall of the inner conduit 21 will not overlap on the same radial line. This staggered distribution can also avoid the situation where multiple flow-blocking membranes 31 bulge excessively at the same axial position, causing a sharp reduction in the local inner diameter of the inner conduit 21, and ensure that the fluid in the pipeline can maintain a relatively stable flow state during the flow-limiting and pressure-reducing process.

[0027] In a preferred embodiment, the material of the flow-blocking membrane 31 is any one of the following materials: medical liquid silicone, medical polyurethane film (TPU), and medical thermoplastic elastomer (TPE). In this embodiment, the material of the flow-blocking membrane 31 is preferably medical polyurethane film.

[0028] It should be noted that in this embodiment, the medical polyurethane film is made of a medical polymer material with nonlinear elasticity. When the suction negative pressure does not reach the preset safety threshold, the flow-blocking membrane 31 can maintain its initial shape without significant bulging or slight bulging that does not affect the flow of fluid inside the inner catheter 21. When the suction negative pressure exceeds the preset safety threshold, the flow-blocking membrane 31 bulges towards the central axis of the inner catheter 21. After the flow-blocking membrane 31 bulges to its maximum height, it cannot continue to stretch and deform due to the sharp increase in the nonlinear elastic modulus of the material itself. This ensures that there is still sufficient flow cross-sectional area inside the pipeline to avoid poor drainage, and also prevents the flow-blocking membrane 31 from tearing or breaking under maximum deformation. Specifically, this nonlinear elastic characteristic makes the flow-blocking membrane 31 exhibit differentiated mechanical responses at different negative pressure stages. When the negative pressure is within the normal irrigation range and the preset safety threshold is not reached, the elastic modulus of the material is low, and the flow-blocking membrane 31 only produces slight elastic deformation, hardly changing the effective flow diameter of the inner catheter 21, ensuring that the irrigation fluid can smoothly enter and exit the stomach and meet the flow requirements for treatment. However, when the negative pressure rises abnormally and exceeds the preset safety threshold, the molecular chain structure inside the material begins to rearrange under continuous tension. At this time, the elastic modulus increases rapidly, and the bulging deformation rate of the flow-blocking membrane 31 slows down until it reaches the maximum bulging height determined by its material properties. This can significantly reduce the effective flow cross-sectional area inside the inner catheter 21, thereby reducing the negative pressure by reducing the flow rate, and also avoid drainage stagnation caused by an excessively small cross-sectional area. In addition, the medical polyurethane film also has good biocompatibility and fatigue resistance. During repeated negative pressure changes and deformation, it is not prone to aging or cracking, ensuring the stability and safety of the device during long-term use.

[0029] In a preferred embodiment, the thickness of the flow-blocking membrane 31 ranges from 0.1 mm to 1 mm, the elongation at break is >300%, and the Shore A hardness ranges from 20 to 60.

[0030] In this embodiment, the thickness of the flow-restricting membrane 31 is set between 0.1 mm and 1 mm, taking into account the material's flexibility, structural strength, and sensitivity to negative pressure changes. Specifically, if the thickness is less than 0.1 mm, although the material has excellent flexibility and is sensitive to small negative pressure changes, its strength may be insufficient to support repeated rinsing, easily leading to damage or tearing, making it difficult to guarantee the durability and safety of the device. When the thickness is greater than 1 mm, the material's rigidity increases, its flexibility decreases, and its response speed to negative pressure changes slows down, potentially preventing effective bulging deformation when the negative pressure exceeds the threshold, thus affecting the timeliness and effectiveness of flow restriction and pressure reduction. The elongation at break >300% ensures that the flow-restricting membrane 31 can generate sufficiently large elastic deformation under negative pressure to bulge into the inner conduit 21 by avoiding the through-hole 23, thereby effectively adjusting the flow inner diameter. Even under large deformation amplitudes, it is not prone to plastic deformation or breakage, ensuring its structural integrity under various working conditions. The Shore hardness range is set to 20–60 Shore. A ensures that the flow-blocking membrane 31 maintains good adhesion to the outer wall of the inner conduit 21 in the initial state, while also being able to elastically bulge smoothly under negative pressure. When the Shore hardness is below 20 Shore A, the material is too soft and may undergo unnecessary deformation under normal flushing pressure, affecting normal flow. When it is above 60 Shore A, the material is too hard and requires a greater negative pressure to bulge, reducing its sensitivity to abnormal increases in negative pressure and failing to provide timely protection.

[0031] In a preferred embodiment, the thickness and Shore hardness of the choke membrane 31 in the plurality of choke modules 30 are progressively increased from the end away from the gastric lavage machine body 10 to the end closer to the gastric lavage machine body 10.

[0032] In this embodiment, the thickness and Shore hardness of the multiple flow-blocking membranes 31 are designed with gradients, enabling precise graded responses to negative pressure at different locations. Specifically, the flow-blocking membrane 31 at the end furthest from the main body 10 of the gastric lavage machine, i.e., the front end closest to the child's stomach, is thinner and has a lower Shore hardness. This makes the flow-blocking membrane 31 in this area more sensitive to changes in negative pressure. It responds quickly when the negative pressure slightly exceeds the safety threshold, promptly limiting the flow and reducing the pressure in the front-end tubing to prevent high negative pressure from directly acting on the gastric mucosa, thus acting as the first line of defense. The flow-blocking membrane 31 closer to the main body 10 of the gastric lavage machine responds more sensitively to changes in negative pressure. The thickness and Shore hardness of the rear flow-blocking membrane 31 gradually increase, requiring a greater negative pressure to transform it from its initial form to a flow-blocking form. The advantage of the gradient design is that when the overall negative pressure of the irrigation system exceeds the set threshold, the front flow-blocking membrane 31 will activate first to limit the flow. If the negative pressure continues to rise, the middle and even the rear flow-blocking membranes 31 will activate sequentially, forming a step-like pressure reduction mechanism. This avoids damage to a single flow-blocking membrane 31 due to excessive pressure. At the same time, it can also perform more precise flow regulation according to the degree of increase in negative pressure, ensuring the safety and stability of the irrigation process.

[0033] In one specific embodiment, assuming the thickness of the front choke membrane 31 is 0.1 mm and the Shore A hardness is 20, the thickness of the middle choke membrane 31 is 0.5 mm and the Shore A hardness is 40, and the thickness of the rear choke membrane 31 is 1 mm and the Shore A hardness is 60, when slight negative pressure fluctuations occur during irrigation, only the front choke membrane 31 deforms for fine adjustment; when a more severe abnormal increase in negative pressure occurs, the front and middle choke membranes 31 work together to significantly reduce the flow inner diameter; and in extreme cases, all choke membranes 31 participate in flow restriction, controlling the negative pressure within an absolutely safe range. This gradually increasing structural strength from front to back ensures both precise protection of the sensitive area at the front of the stomach and the reliability of the entire pipeline system in dealing with different degrees of negative pressure abnormalities. Of course, this is only an example of one solution and does not constitute a specific limitation.

[0034] Please refer to it again. Figures 5 to 6 The flow-blocking module 30 also includes two retaining rings 32 and two support blocks 33. The two retaining rings 32 are respectively fixed to both ends of the flow-blocking membrane 31, and the retaining rings 32 are fixedly connected to the inner conduit 21. The flow-blocking membrane 31 and the inner conduit 21 are fixedly connected by the retaining rings 32. The two support blocks 33 are respectively fixed to the ends of the two retaining rings 32 that are far apart from each other, and the outer wall of the support block 33 is in contact with the inner wall of the outer conduit 22. The support block 33 is configured to provide support for the outer conduit 22. The support block 33 has multiple air holes 34 inside. The hollow interlayer between the inner conduit 21 and the outer conduit 22 is divided into multiple chambers by the support block 33, and the multiple chambers are interconnected.

[0035] In this embodiment, the two support blocks 33 are arranged such that their outer walls are tightly fitted to the inner wall of the outer conduit 22. The support blocks 33 provide circumferential support to the inner wall of the outer conduit 22, effectively preventing collapse or excessive deformation of the outer conduit 22 during irrigation when changes in negative pressure inside the inner conduit 21 cause pressure differences between the inside and outside, thus ensuring the structural stability of the hollow-layer conduit. Simultaneously, the multiple air holes 34 inside the support blocks 33 allow the multiple chambers formed by the hollow layer between the inner and outer conduits 21 and 22, separated by the support blocks 33, to be opened through these air holes 34. The interconnected structure ensures that the pressure inside the hollow interlayer is evenly distributed, preventing the flow-limiting membrane 31 from being affected by excessively high or low local pressure. For example, when the negative pressure inside the inner conduit 21 increases, the pressure inside the hollow interlayer remains relatively stable. The pressure difference drives the flow-limiting membrane 31 to change from its initial form to a flow-limiting form. The presence of the pores 34 allows the pressure between the chambers to be quickly balanced, ensuring that all flow-limiting membranes 31 can make corresponding deformation responses according to their own thickness and hardness characteristics under the same pressure environment, thereby achieving the coordination and unity of the flow-limiting and pressure-reducing functions of the entire device.

[0036] In a preferred embodiment, please refer to Figure 8 As shown, the inner diameter of the inner conduit 21 is denoted as R, and the normal height of the flow-blocking membrane 31 in the flow-blocking state and the inner wall of the inner conduit 21 is denoted as H, where H≤1 / 3*R.

[0037] In this embodiment, H is set to ≤1 / 3*R in order to strictly control the minimum retention ratio of the effective flow cross-sectional area inside the inner catheter 21 while achieving the effect of flow restriction and pressure reduction. Specifically, when the choke membrane 31 protrudes to the maximum height H, the remaining flow inner diameter inside the inner catheter 21 is at least R-2H. This avoids the situation where the inner catheter 21 is almost blocked due to excessive protrusion of the choke membrane 31, ensuring that the irrigation fluid can still flow continuously at a certain flow rate, and preventing the risk of gastric bloating or reflux caused by the inability of gastric fluid to be discharged in time.

[0038] The working principle of this invention is as follows: Please see Figure 7 and Figure 8 As shown, when lavaging a child's stomach, the gastric tube 20 is delivered to the child's stomach, and the main body 10 of the gastric lavage machine is started to lavage the stomach with saline. During the lavage process, when the negative pressure is greater than the set threshold, the negative pressure inside the inner tube 21 increases, and the flow-blocking membrane 31 bulges towards the central axis of the inner tube 21 through the interior of the bypass hole 23, and changes from the initial state to the flow-blocking state. The flow-blocking membrane 31 in the flow-blocking state squeezes the space inside the inner tube 21, reducing the effective flow diameter inside the inner tube 21, thereby reducing the liquid flow per unit time and achieving the effect of flow restriction and pressure reduction.

[0039] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this invention are implemented according to conventional methods in the art unless otherwise specified or limited.

Claims

1. A pediatric digestive tract irrigation device, characterized in that: The gastric lavage machine includes a main body (10), the interior of which is provided with a placement groove, and the upper end of the placement groove is provided with a flushing connector. It also includes: A gastric tube (20) is provided, comprising an inner tube (21) and an outer tube (22). The inner tube (21) is sleeved on the outside of the flushing connector, and the outer tube (22) is coaxially disposed on the outside of the inner tube (21). The sidewall of the inner tube (21) is provided with multiple flow-blocking holes at equal intervals along the axial direction. The flow-blocking holes are composed of multiple clearance holes (23) located in the same radial section. The inner tube (21) and the outer tube (22) constitute a hollow sandwich tube structure. Multiple flow-blocking modules (30), each flow-blocking module (30) includes a flow-blocking membrane (31), the flow-blocking membrane (31) is fixed to the outside of the inner conduit (21) and located inside the outer conduit (22), and the multiple flow-blocking modules (30) and multiple flow-blocking aperture arrays are adapted to each other; When the negative pressure inside the inner conduit (21) is greater than the threshold, the flow-blocking membrane (31) bulges towards the central axis of the inner conduit (21) and changes from the initial state to the flow-blocking state, and the effective flow diameter inside the inner conduit (21) decreases.

2. The pediatric digestive tract irrigation device according to claim 1, characterized in that: The clearance holes (23) in two adjacent flow-blocking holes are misaligned along the axial direction of the inner guide tube (21).

3. The pediatric digestive tract irrigation device according to claim 1, characterized in that: The material of the flow-blocking membrane (31) is any one of the following: liquid silicone, polyurethane film, thermoplastic elastomer.

4. The pediatric digestive tract irrigation device according to claim 1, characterized in that: The thickness of the flow-blocking membrane (31) ranges from 0.1 mm to 1 mm, the elongation at break is greater than 300%, and the Shore hardness ranges from 20 to 60 Shore A.

5. The pediatric digestive tract irrigation device according to claim 4, characterized in that: The choke membranes (31) in the plurality of choke modules (30) are arranged with increasing thickness and Shore hardness from the end away from the gastric lavage machine body (10) to the end close to the gastric lavage machine body (10).

6. The pediatric digestive tract irrigation device according to claim 1, characterized in that: The flow-blocking module (30) further includes two retaining rings (32) and two support blocks (33). The two retaining rings (32) are respectively fixed to both ends of the flow-blocking membrane (31), and the retaining rings (32) are fixedly connected to the inner conduit (21). The two support blocks (33) are respectively fixed to the ends of the two retaining rings (32) that are far apart from each other, and the outer wall of the support block (33) is in contact with the inner wall of the outer conduit (22). The support block (33) is configured to provide support for the outer conduit (22).

7. The pediatric digestive tract irrigation device according to claim 6, characterized in that: The support block (33) has multiple air holes (34) inside.

8. The pediatric digestive tract irrigation device according to claim 4, characterized in that: The inner diameter of the inner conduit (21) is denoted as R, and the normal height of the inner wall of the flow-blocking membrane (31) and the inner conduit (21) in the flow-blocking state is denoted as H, where H≤1 / 3*R.

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