Gastric retention suction device for enteral nutrition patients

Abstract

The invention relates to the technical field of medical instruments, in particular to a gastric retention suction device for enteral nutrition patients, which comprises a stomach tube connecting assembly, a negative pressure suction assembly, a volume metering assembly, a pressure adjusting assembly and a one-way conduction assembly, one end of the stomach tube connecting assembly is provided with a Luer locking interface, and the other end of the stomach tube connecting assembly is communicated with a three-way valve; the other two ends of the three-way valve are communicated with the negative pressure suction assembly and the capacity metering assembly respectively. The negative pressure suction assembly comprises a piston cylinder, the piston cylinder communicates with the three-way valve, and scale marks are arranged on the side wall of the piston cylinder; the pressure adjusting assembly is embedded into the top of the piston cylinder and electrically connected with a negative pressure sensor and a pressure display screen. The one-way conduction assembly comprises a first one-way valve arranged between the three-way valve and the capacity metering assembly and a second one-way valve arranged between the piston cylinder and the three-way valve. Efficient extraction, accurate metering and safety protection of gastric retention fluid of enteral nutrition patients are achieved.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a gastric retention aspiration device for patients receiving enteral nutrition. Background Technology

[0002] Enteral nutrition support is an important means of providing nutritional support to patients who cannot eat orally (such as those in a coma, with severe pancreatitis, or in the postoperative recovery period). Nutritional preparations are delivered to the gastrointestinal tract through a gastric tube to maintain the patient's basal metabolism and organ function. However, these patients often experience gastric retention due to weakened gastrointestinal motility and delayed gastric emptying—the nutritional preparations or secretions in the stomach cannot be emptied in time. If not treated promptly, this can easily lead to serious complications such as aspiration, reflux esophagitis, and aspiration pneumonia, and even endanger life. Therefore, it is necessary to regularly remove the gastric retention fluid using a gastric retention aspiration device to monitor gastric emptying and reduce the risk of complications.

[0003] Current clinically used traditional gastric retention aspiration devices have several technical drawbacks: First, the interface sealing performance is poor, often using a simple plug-in connection, which easily leads to leakage of gastric retention fluid when connected to the gastric tube due to incomplete sealing. This not only contaminates the operating environment but may also cause cross-infection due to residual liquid. Second, the negative pressure control accuracy is low, with the amount of negative pressure entirely based on experience. Sudden pressure increases can easily damage the gastric mucosa, while insufficient pressure leads to incomplete aspiration. Third, there is no backflow prevention design. If the operation is paused or the patient's position is changed during aspiration, gastric fluid can easily flow back into the gastric tube through the device's pathway, increasing the risk of infection and patient discomfort. Fourth, the measurement and operation are inconvenient. The aspirated gastric retention fluid needs to be transferred to a separate measuring cup for measurement, which is cumbersome. Liquid leakage during the transfer process can easily lead to measurement errors, affecting the accurate assessment of the patient's gastric emptying function.

[0004] The aforementioned defects not only increase the workload of medical staff, but also make it difficult to meet the needs of precise clinical nursing. Therefore, developing a gastric retention aspiration device that is reliably sealed, has controllable negative pressure, prevents backflow, and is convenient for measurement has become the key to solving the current clinical pain points. Summary of the Invention

[0005] To address the aforementioned issues, this invention provides a gastric retention aspiration device for enteral nutrition patients. This device enables efficient extraction, precise measurement, and safe protection of gastric retention fluid in enteral nutrition patients. By optimizing the interface sealing structure and anti-backflow design, it reduces leakage rates and infection risks during operation. Simultaneously, it simplifies the measurement process, reduces the workload of medical staff, and provides reliable equipment support for clinical gastric retention monitoring and complication prevention.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: a gastric retention aspiration device for enteral nutrition patients, comprising a gastric tube connection assembly for detachable connection with the patient's gastric tube, a negative pressure aspiration assembly for generating negative pressure to aspirate gastric retention fluid, a volumetric metering assembly for accurately measuring the volume of gastric retention fluid, a pressure regulating assembly for adjusting and monitoring the aspiration negative pressure, and a one-way conduction assembly for preventing backflow contamination of gastric retention fluid. One end of the gastric tube connection assembly is provided with a Luer locking interface, and the other end of the gastric tube connection assembly is connected to a three-way valve. The other two ends of the three-way valve are respectively connected to the negative pressure aspiration assembly and the volumetric metering assembly.

[0007] The negative pressure aspiration assembly includes a piston cylinder for storing the aspirated gastric retention fluid and assisting in observing its volume. The piston cylinder is connected to a three-way valve, and the side wall of the piston cylinder is provided with scale lines. The pressure regulating assembly is embedded in the top of the piston cylinder and is electrically connected to a negative pressure sensor for real-time acquisition of aspiration pressure and a pressure display screen for displaying pressure values.

[0008] The one-way flow assembly includes a first check valve located between the three-way valve and the volumetric metering assembly, and a second check valve located between the piston cylinder and the three-way valve. The first check valve is used to allow gastric retention fluid to flow only from the three-way valve to the volumetric metering assembly, and the second check valve is used to allow gastric retention fluid to flow only from the three-way valve to the piston cylinder.

[0009] Furthermore, the inner wall of the Luer locking interface is provided with a sealing ring to enhance the sealing performance. The sealing ring has a "V" shaped cross-section with the "V" opening facing the inside of the Luer locking interface. The outer periphery of the Luer locking interface is provided with anti-slip textures to improve grip friction.

[0010] Furthermore, the three-way valve has a rotary switching handle on its side wall for switching the passage status. The end of the rotary switching handle has a positioning protrusion for positioning the passage status. The three-way valve housing has three positioning grooves that are adapted to the positioning protrusions. The three positioning grooves correspond to the three working states of "gastric tube - suction", "gastric tube - metering" and "closed" respectively. When the positioning protrusions are engaged with the positioning grooves, the three-way valve enters the corresponding working state.

[0011] Furthermore, the volume measurement component includes a measuring cylinder for visually observing gastric retention fluid and a liquid level sensor for monitoring the liquid level height. The liquid level sensor is connected to an audible and visual alarm. When the liquid level sensor detects that the liquid level in the measuring cylinder has reached a preset liquid level height threshold, the audible and visual alarm will automatically issue an audible and visual alert.

[0012] Furthermore, the piston cylinder is equipped with a stopper plate for buffering suction pressure fluctuations. A double-layer rubber ring is provided between the stopper plate and the cylinder wall of the piston cylinder. The stopper plate is fixedly connected to the piston rod. The end of the piston rod is equipped with an arc-shaped pressing plate for reducing hand fatigue. The surface of the arc-shaped pressing plate is provided with vent holes.

[0013] Furthermore, the pressure regulating assembly includes a pressure regulating spring, a pressure relief valve, and a negative pressure regulating knob. The top of the pressure regulating spring is fixedly connected to the bottom of the negative pressure regulating knob, and the bottom of the pressure regulating spring contacts the top of the valve core of the pressure relief valve. The pressure relief valve is embedded in the top side wall of the piston cylinder, with its inlet end communicating with the inside of the piston cylinder and its outlet end communicating with the atmosphere. The negative pressure regulating knob is screwed onto the top of the pressure relief valve via a thread. The negative pressure regulating knob is used to change the compression of the pressure regulating spring, thereby adjusting the opening pressure of the pressure relief valve.

[0014] Furthermore, the first check valve is a duckbill type flexible check valve; the second check valve is a ball-core type check valve.

[0015] Furthermore, the bottom of the piston cylinder is provided with a drain valve for draining gastric retention fluid. A pull rod is installed between the drain valve and the bottom of the plug plate. One end of the pull rod is hinged to the valve core of the drain valve, and the other end of the pull rod is provided with a slide groove. The side wall of the piston rod is provided with a protrusion that matches the slide groove. The protrusion is embedded in the slide groove and can slide along the slide groove.

[0016] When the piston rod is pulled upward to its maximum stroke, the protrusion slides along the groove to the top, and drives the valve core of the drain valve to move upward through the pull rod, so that the drain valve opens automatically and the gastric retention fluid in the measuring cylinder is discharged.

[0017] Furthermore, a pressure buffer chamber is provided between the negative pressure sensor and the three-way valve, and the inner wall of the pressure buffer chamber is provided with a honeycomb pressure reduction structure.

[0018] Furthermore, an annular hook is provided on the outer side of the piston cylinder away from the three-way valve.

[0019] The above approach has the following beneficial effects:

[0020] 1. This solution features targeted structural optimization of the Luer locking interface. When the inner wall V-shaped sealing ring is connected to the gastric tube, it undergoes adaptive compression deformation as the interface is screwed together, forming an annular sealing band. Combined with the outer anti-slip structure, this enhances operational stability. Compared to traditional technologies where the interface seal relies on a single contact surface and is prone to leakage due to differences in gastric tube specifications or operational shaking, the sealing adaptability is significantly improved. It is compatible with different specifications of gastric tubes, and the risk of leakage continues to decrease with long-term use. From a structural perspective, it eliminates cross-infection and environmental pollution caused by liquid leakage, providing a basic guarantee for clinical aseptic operation.

[0021] 2. This solution uses the positioning protrusion of the three-way valve switching handle and the positioning groove of the outer shell to form a hierarchical positioning mechanism. The feedback force when the valve is engaged can intuitively indicate that the passage status has been switched to the correct position. Compared with the shortcomings of traditional three-way valves that rely on manual judgment of the switching position and are prone to partial opening or incorrect switching due to operational negligence, the accuracy and stability of passage switching are greatly improved. This ensures that gastric retention fluid flows into the piston cylinder during aspiration, is accurately introduced into the metering cylinder during measurement, and completely isolates the passage when closed. This effectively avoids the problem of gastric retention fluid flowing back into the gastric tube or being accidentally discharged into the operating environment due to improper passage switching.

[0022] 3. This solution constructs an intelligent linkage system between a liquid level sensor and an audible and visual alarm, which monitors changes in the liquid level in the measuring cylinder in real time and automatically triggers an alarm. Compared with the shortcomings of traditional technology, which requires continuous manual observation of the scale and is prone to measurement omissions or reading errors due to busy nursing work, this solution automates and automates the measurement process. It not only makes the gastric retention fluid volume data more accurate, but also allows medical staff to perform other nursing operations simultaneously without having to pay attention to the liquid level, significantly improving the overall efficiency and accuracy of clinical nursing work.

[0023] 4. This solution optimizes the sealing structure of the plug plate and the pressing operation structure in a coordinated manner. The double-layer rubber ring forms a double sealing barrier. Combined with the precise fit between the plug plate and the piston cylinder wall, the sealing reliability is greatly improved. At the same time, the arc-shaped pressing plate conforms to the physiological curve of the hand, and the vent design improves the grip comfort. Compared with the problems of easy aging and failure of the plug plate seal and air leakage and operation fatigue caused by poor fit of the pressing plate in traditional technology, the durability of the sealing structure and the humanized operation experience are significantly improved. Even when operating on multiple patients for a long time, it can effectively reduce the burden on the hands of medical staff and ensure the consistency of operation.

[0024] 5. This solution creates a dual negative pressure control system of "active adjustment + passive buffering". The mechanical cooperation between the pressure regulating spring and the pressure relief valve achieves precise preset of negative pressure. The honeycomb pressure relief structure of the pressure buffer chamber can absorb pressure fluctuations during the suction process. Compared with the shortcomings of traditional technology, which has no quantitative standard for negative pressure adjustment and is prone to irritating the gastric mucosa by sudden pressure changes, this solution can accurately match the negative pressure intensity according to the individual differences in gastric motility of patients. At the same time, when patients experience coughing, nausea, or other symptoms that cause a sudden increase in gastric pressure, the buffer structure can quickly release pressure to avoid negative pressure backflow damaging the gastric mucosa. This makes the suction operation more personalized and safer, and adapts to the nursing needs of patients with different conditions.

[0025] 6. This design utilizes a mechanical linkage drainage structure based on the piston rod stroke. The piston rod movement directly drives the pull rod to control the opening and closing of the drainage valve. Compared with traditional technologies that require additional manual valve operation and are prone to hand contact contamination, this design achieves continuity and automation of aspiration and drainage operations without adding extra steps. This shortens the total operation time per case and eliminates the contact path between the hand and the drainage valve, reducing the risk of cross-infection and better meeting the strict requirements of clinical aseptic operation.

[0026] 7. This solution utilizes the synergistic effect of a negative pressure sensor, a pressure buffer chamber, and a pressure relief valve to construct a dynamic negative pressure monitoring and control mechanism. It captures changes in intragastric pressure in real time during aspiration. When abnormal pressure fluctuations occur, the pressure relief valve quickly adjusts the pressure. Compared with traditional technologies that rely on manual experience for negative pressure adjustment and cannot cope with sudden pressure changes, this solution can dynamically optimize negative pressure parameters based on the patient's real-time physiological state. For example, it maintains a stable negative pressure to ensure aspiration effect when the patient has strong gastric motility, and automatically releases pressure when there is a sudden increase in intragastric pressure, such as nausea or sneezing. This achieves intelligent dynamic adaptation of negative pressure, minimizes the risk of gastric mucosal damage, and improves treatment safety and patient tolerance.

[0027] 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

[0028] Figure 1 This is an isometric view of an embodiment of the gastric retention aspiration device for enteral nutrition patients according to the present invention;

[0029] Figure 2 This is a cross-sectional view of the piston cylinder in an embodiment of the gastric retention aspiration device for enteral nutrition patients according to the present invention.

[0030] The reference numerals in the accompanying drawings include: 1. Gastric tube connection assembly; 2. Luer locking interface; 3. Three-way valve; 301. Rotary switching handle; 302. Positioning protrusion; 303. Positioning groove; 4. Piston cylinder; 401. Plug plate; 402. Piston rod; 403. Arc-shaped pressing plate; 5. Measuring cylinder; 6. Drain valve; 7. Pull rod; 701. Slide groove; 8. Protrusion. Detailed Implementation

[0031] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., 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 the invention and for 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 the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] The following detailed description illustrates the specific implementation method:

[0035] Example 1:

[0036] As attached Figure 1 and Figure 2 As shown: A gastric retention aspiration device for enteral nutrition patients includes a gastric tube connection assembly 1 for detachable connection with the patient's gastric tube, a negative pressure aspiration assembly for generating negative pressure to aspirate gastric retention fluid, a volumetric metering assembly for accurately measuring the volume of gastric retention fluid, a pressure regulating assembly for adjusting and monitoring the aspiration negative pressure, and a one-way conduction assembly for preventing backflow contamination of gastric retention fluid. One end of the gastric tube connection assembly 1 is provided with a Luer locking interface 2, and the other end of the gastric tube connection assembly 1 is connected to a three-way valve 3. The other two ends of the three-way valve 3 are respectively connected to the negative pressure aspiration assembly and the volumetric metering assembly. The inner wall of the Luer locking interface 2 is provided with a sealing ring for enhancing sealing performance. The sealing ring has a "V" shaped cross-section, with the "V" shaped opening facing the inner side of the Luer locking interface 2. The outer periphery of the Luer locking interface 2 is provided with anti-slip textures to improve grip friction.

[0037] The three-way valve 3 has a rotary switching handle 301 on its side wall for switching the passage state. The end of the rotary switching handle 301 has a positioning protrusion 302 for positioning the passage state. The outer shell of the three-way valve 3 has three positioning grooves 303 that are adapted to the positioning protrusions 302. The three positioning grooves 303 correspond to the three working states of "gastric tube - suction", "gastric tube - metering" and "closed" respectively. When the positioning protrusions 302 and the positioning grooves 303 are engaged, the three-way valve 3 enters the corresponding working state.

[0038] The negative pressure aspiration assembly includes a piston cylinder 4 for storing the extracted gastric retention fluid and assisting in observing its volume. The piston cylinder 4 is connected to a three-way valve 3, and the side wall of the piston cylinder 4 is provided with scale lines. The pressure regulating assembly is embedded in the top of the piston cylinder 4 and is electrically connected to a negative pressure sensor for real-time acquisition of aspiration pressure and a pressure display screen for displaying pressure values.

[0039] The one-way flow assembly includes a first check valve located between the three-way valve 3 and the volumetric metering assembly, and a second check valve located between the piston cylinder 4 and the three-way valve 3. The first check valve allows only gastric retention fluid to flow from the three-way valve 3 to the volumetric metering assembly, and the second check valve allows only gastric retention fluid to flow from the three-way valve 3 to the piston cylinder 4. The first and second check valves have opposite flow directions. The first check valve is a duckbill-type resilient check valve; the second check valve is a ball-core type check valve.

[0040] The volume measurement component includes a measuring cylinder 5 for visual observation of gastric retention fluid and a liquid level sensor for monitoring the liquid level height. The liquid level sensor is connected to an audible and visual alarm. When the liquid level sensor detects that the liquid level in the measuring cylinder 5 has reached a preset liquid level height threshold, the audible and visual alarm will automatically issue an audible and visual alert.

[0041] The pressure regulating assembly includes a pressure regulating spring, a pressure relief valve, and a negative pressure regulating knob. The top of the pressure regulating spring is fixedly connected to the bottom of the negative pressure regulating knob, and the bottom of the pressure regulating spring contacts the top of the valve core of the pressure relief valve. The pressure relief valve is embedded in the top side wall of the piston cylinder 4, with its inlet end communicating with the inside of the piston cylinder 4 and its outlet end communicating with the atmosphere. The negative pressure regulating knob is screwed onto the top of the pressure relief valve via a thread. The negative pressure regulating knob is used to change the compression of the pressure regulating spring, thereby adjusting the opening pressure of the pressure relief valve.

[0042] The specific implementation process is as follows: Before use, check the status of each component of the device, confirm that there is no residual liquid in the piston cylinder 4, the scale lines are clear, the negative pressure sensor and the pressure display screen are connected normally and display the initial atmospheric pressure (0 kPa), and the audible and visual alarm is in standby mode. Connect the end of the patient's gastric tube to the Luer locking interface 2 of the gastric tube connection component 1, and rotate the outer circumference of the interface until a "click" sound is heard. At this time, the "V"-shaped sealing ring is squeezed tightly against the outer wall of the gastric tube, achieving a seal; at the same time, the anti-slip texture increases the friction of the hand grip, preventing the interface from slipping during the connection process.

[0043] According to the aspiration requirements, rotate the rotary switching handle 301 on the side wall of the three-way valve 3 so that the positioning protrusion 302 at the end of the handle engages with the positioning groove 303 corresponding to "gastric tube-aspiration". At this time, the internal passage of the three-way valve 3 is connected to "gastric tube-piston cylinder 4" and disconnected from "gastric tube-measuring cylinder 5". Subsequently, rotate the negative pressure adjustment knob on the top of the piston cylinder 4 to change the compression of the pressure regulating spring through the threaded transmission: if gentle aspiration is required (suitable for patients with fragile gastric mucosa), rotate the knob clockwise to compress the spring (compression amount 2mm) to adjust the pressure relief valve opening pressure to -3kPa; if deep aspiration is required (suitable for patients with severe gastric retention), rotate the knob counterclockwise to reduce the spring compression (compression amount 1mm) to adjust the pressure relief valve opening pressure to -6kPa. The pressure display screen displays the preset negative pressure value in real time.

[0044] Medical staff hold the arc-shaped pressing plate 403 at the end of the piston rod 402 and slowly pull the piston rod 402 upwards, increasing the volume inside the piston cylinder 4 and creating negative pressure. When the negative pressure reaches a preset value, the pressure inside the piston cylinder 4 triggers the pressure relief valve. The valve core is balanced by the elastic force of the pressure regulating spring and the negative pressure, maintaining a stable negative pressure. At the same time, the second one-way valve (ball-core type) opens under the action of negative pressure, and the gastric retention fluid enters the piston cylinder 4 through the gastric tube, Luer locking interface 2, and three-way valve 3. The scale lines on the side wall of the piston cylinder 4 can help observe the aspiration volume. During the aspiration process, if abnormal fluctuations in negative pressure occur, the negative pressure sensor captures the signal in real time and highlights it on the pressure display screen. Medical staff can correct the pressure by fine-tuning the negative pressure adjustment knob.

[0045] When the gastric retention fluid in piston cylinder 4 reaches the warning mark (e.g., 150ml), stop pulling piston rod 402, rotate the three-way valve 3 switch handle to make the positioning protrusion 302 engage with the "gastric tube-measuring" positioning groove 303, opening the "gastric tube-measuring cylinder 5" passage. Slowly press piston rod 402 downwards, increasing the pressure inside piston cylinder 4, closing the second one-way valve, and allowing the gastric retention fluid to flow into measuring cylinder 5 via the three-way valve 3, which pushes the first one-way valve (duckbill type). At this time, the liquid level sensor in measuring cylinder 5 monitors the liquid level in real time. When the liquid level reaches the preset threshold (e.g., 250ml), the liquid level sensor sends a signal to the audible and visual alarm, which emits a 2200Hz buzzer and illuminates a red LED light, reminding medical staff to stop drainage and record the measurement data.

[0046] After measurement, rotate the three-way valve 3 to the "closed" position to disconnect the gastric tube from the Luer locking interface 2. Pour out the gastric retention fluid in the measuring cylinder 5, and flush the piston cylinder 4, measuring cylinder 5, and one-way valve passage with saline to ensure no residue remains. Then reset the piston rod 402, check the sealing of each component, and place the device in a clean area for future use, to be pre-treated before the next use.

[0047] Example 2:

[0048] As attached Figure 2 As shown, the difference from Embodiment 1 is that the piston cylinder 4 is provided with a stopper plate 401 for buffering suction pressure fluctuations. A double-layer rubber ring is provided between the stopper plate 401 and the cylinder wall of the piston cylinder 4. The stopper plate 401 is fixedly connected to the piston rod 402. The end of the piston rod 402 is provided with an arc-shaped pressing plate 403 for reducing hand pressing fatigue. The surface of the arc-shaped pressing plate 403 is provided with vent holes.

[0049] The specific implementation process is as follows: Based on the pretreatment in Example 1, check the status of the plug plate 401 assembly: confirm that the double-layer rubber ring between the plug plate 401 and the piston cylinder 4 wall is undamaged and misaligned (the distance between the two rubber rings is maintained at 2mm), and that the ventilation holes (1mm diameter) on the surface of the arc-shaped pressing plate 403 are not blocked. When holding the arc-shaped pressing plate 403, the hand naturally conforms to its 120° arc surface, and the ventilation holes can quickly drain sweat from the palm, avoiding slippage caused by prolonged holding.

[0050] After the negative pressure preset in Example 1 is completed, the buffering effect of the stopper plate 401 is significantly demonstrated during the suction operation: when the piston rod 402 is pulled upward, the stopper plate 401 forms a gradual negative pressure due to the friction between the double-layer rubber ring and the cylinder wall (the pressure rise rate is reduced by 40% compared to the traditional stopper plate 401), avoiding gastric mucosal irritation caused by the sudden pressure rise in the traditional device; if hand tremors occur during operation, the double-layer rubber ring can absorb part of the impact force through elastic deformation, so that the fluctuation amplitude on the pressure display screen is controlled within ±0.5kPa (the fluctuation of the traditional device reaches ±2kPa).

[0051] When the gastric retention fluid in the piston cylinder 4 needs to be drained into the measuring cylinder 5, the ergonomic design of the arc-shaped pressing plate 403 comes into play: the palm of the medical staff fits against the pressing plate, and the 18cm² contact area disperses the pressure of the hand (the pressure per unit area is reduced to 0.3N / cm²), which is 60% less effort than the traditional flat pressing structure. During the pressing process, the double-layer rubber ring fits tightly against the cylinder wall, with the inner rubber ring providing the main seal and the outer rubber ring providing auxiliary leak prevention. Even if the tilt angle of the stopper plate 401 is ≤5°, zero leakage can still be maintained, ensuring that all the gastric retention fluid enters the measuring cylinder 5 through the three-way valve 3.

[0052] After use, disassemble the connection between the piston rod 402 and the stopper plate 401 (rotary snap-fit ​​design), and clean the double-layer rubber ring separately (wipe with a medical alcohol swab to avoid pulling and causing deformation). Ensure the vent is unobstructed (you can use a syringe to inject saline solution for rinsing). When resetting, ensure that the stopper plate 401 is concentric with the cylinder wall to prevent the rubber ring from failing to seal due to misalignment, and to provide a stable pressure buffer for the next use.

[0053] Example 3:

[0054] As attached Figure 2As shown, the difference from Embodiment 2 is that the bottom of the piston cylinder 4 is provided with a drain valve 6 for draining gastric retention fluid. A pull rod 7 is installed between the drain valve 6 and the bottom of the stopper plate 401. One end of the pull rod 7 is hinged to the valve core of the drain valve 6, and the other end of the pull rod 7 is provided with a slide groove 701. The side wall of the piston rod 402 is provided with a protrusion 8 that matches the slide groove 701. The protrusion 8 is embedded in the slide groove 701 and can slide along the slide groove 701. When the piston rod 402 is pulled upward to the maximum stroke, the protrusion 8 slides along the slide groove 701 to the top, and drives the valve core of the drain valve 6 to move upward through the pull rod 7, so that the drain valve 6 opens automatically and the gastric retention fluid in the metering cylinder 5 is discharged.

[0055] The specific implementation process is as follows: Based on the pretreatment in Example 2, check the drainage linkage structure: confirm that there is no looseness at the hinge of the pull rod 7 and the valve core of the drainage valve 6 (the pin rotates flexibly without jamming), the protrusion 8 on the side wall of the piston rod 402 is fully embedded in the slide groove 701 of the pull rod 7 (gap ≤ 0.5mm), and the drainage valve 6 is initially closed (the valve core and valve seat fit tightly). Push the piston rod 402 to the lowest position and observe the initial position of the protrusion 8 in the slide groove 701 (located at the bottom of the slide groove 701) to ensure that the linkage structure is not misaligned.

[0056] After the gastric retention fluid is aspirated according to the operating steps of Example 2, the gastric retention fluid to be discharged accumulates in the piston cylinder 4. At this time, the piston rod 402 is in the low position after being pressed down, the protrusion 8 is located at the bottom end of the slide groove 701, the pull rod 7 does not apply a pulling force to the valve core of the discharge valve 6, and the discharge valve 6 remains closed to avoid liquid leakage during the metering process.

[0057] When it is necessary to drain the gastric retention fluid in the measuring cylinder 5, continue to pull the piston rod 402 upward (exceeding the conventional suction stroke in Example 2) until the piston rod 402 reaches its maximum stroke (the distance between the top of the stopper plate 401 and the top of the piston cylinder 4 is ≤1cm). During this process, the protrusion 8 on the side wall of the piston rod 402 slides upward along the groove 701 of the pull rod 7. When the protrusion 8 reaches the top of the groove 701, the pull rod 7 applies an upward pulling force to the valve core of the drain valve 6 (the pulling force gradually increases with the rise of the liquid level, and the maximum pulling force is ≤2N). The valve core moves upward against its own gravity and liquid pressure (displacement amount 3-5mm), and the drain valve 6 opens automatically. The gastric retention fluid in the piston cylinder 4 is discharged through the drain port under the action of gravity (flow rate ≥8ml / s).

[0058] After drainage is complete, slowly press the piston rod 402 downwards. The protrusion 8 slides along the slide groove 701 from top to bottom. The pulling force of the pull rod 7 on the valve core gradually decreases until it disappears. Under the action of its own weight (0.3-0.5N) and the pressure of the residual liquid, the valve core falls back and re-fits the valve seat, and the drainage valve 6 automatically closes. Continue pressing the piston rod 402 to the initial low position. The protrusion 8 returns to the bottom of the slide groove 701, the linkage structure resets, and it is ready for the next suction-drainage cycle.

[0059] Example 4:

[0060] The difference from Embodiment 3 is that a pressure buffer chamber is provided between the negative pressure sensor and the three-way valve 3, and the inner wall of the pressure buffer chamber is provided with a honeycomb pressure reduction structure.

[0061] The specific implementation process is as follows: Based on the pretreatment in Example 3, check the status of the pressure buffer chamber and the honeycomb pressure-reducing structure: observe that there are no cracks or residual liquid on the inner wall of the pressure buffer chamber, and that the honeycomb pressure-reducing structure (3mm side length and 1mm depth of the honeycomb holes) is not blocked or deformed. Turn on the power of the device and check whether the initial value of the pressure display screen stably displays atmospheric pressure (0kPa±0.02kPa). If the value fluctuates by more than ±0.05kPa, the pressure buffer chamber needs to be disassembled, the honeycomb holes rinsed with physiological saline, and then reinstalled to ensure that the buffer structure functions normally.

[0062] Following the operating steps of Example 3, rotate the negative pressure adjustment knob to preset the negative pressure (e.g., -4 kPa). At this time, the pressure inside the piston cylinder 4 changes slowly, and the pressure is transmitted to the pressure buffer chamber through the passage. The honeycomb pressure-reducing structure inside the chamber disperses the pressure into multiple honeycomb holes, slowing down the rate of pressure rise (from the traditional 0.8 kPa / s to 0.3 kPa / s). The pressure signal received by the pressure sensor is more stable, and the pressure display value gradually rises to the preset value in increments of 0.1 kPa, avoiding false triggering of the sensor or stimulation of the gastric mucosa due to a sudden increase in pressure.

[0063] When the piston rod 402 is pulled upwards to aspirate gastric retention fluid, if uneven manual force causes pressure fluctuations within the piston cylinder 4 (e.g., a sudden pressure rise to -5.5 kPa), the pressure first enters the pressure buffer chamber. The honeycomb pressure-reducing structure, through the throttling and diffusion effects of the honeycomb pores, transforms the fluctuating pressure into a smoother pressure (fluctuation amplitude reduced from ±1.2 kPa to ±0.3 kPa) before transmitting it to the negative pressure sensor. The pressure display shows only slight fluctuations, eliminating the need for frequent fine-tuning of the negative pressure adjustment knob by medical personnel. Simultaneously, the smooth pressure transmission avoids sudden changes in gastric pressure, reducing the risk of gastric mucosal damage.

[0064] When the piston rod 402 is pulled upward to its maximum stroke, and the protrusion 8 slides along the groove 701, causing the drain valve 6 to open, the pressure inside the piston cylinder 4 changes instantaneously (from negative pressure to slightly positive pressure). This pressure change is buffered by the pressure buffer chamber, and the negative pressure sensor only detects a pressure fluctuation of 0.2-0.3 kPa. The audible and visual alarm will not be falsely triggered due to the instantaneous pressure change. During the draining process, even if the liquid flow rate in the metering cylinder 5 changes, causing pressure fluctuations in the passage, the honeycomb pressure-reducing structure can still maintain pressure stability, ensuring accurate pressure monitoring data.

[0065] Example 5:

[0066] The difference from Embodiment 4 is that the piston cylinder 4 has an annular hook on the outer side of the end away from the three-way valve 3.

[0067] The specific implementation process is as follows: When performing gastric retention fluid aspiration, pressure adjustment, and level monitoring of the measuring cylinder 5 according to the steps of Example 4, the annular hook is idle. At this time, the idle device can be temporarily suspended on the hook of the infusion stand (diameter ≤2.5cm) next to the bed or on the hanging rod of the nursing cart: directly put the annular hook into the hook / hanging rod, and use the annular structure of the hook to achieve stable suspension of the device, avoiding liquid spillage caused by collision of the piston cylinder 4 and the measuring cylinder 5, or contamination of the passage interface when the device is placed directly on the bedside table or operating table.

[0068] When the piston rod 402 is pulled to its maximum stroke to trigger the opening of the drain valve 6, if it is necessary to free up the hands for other operations (such as recording the amount of fluid drained or assisting the patient in adjusting their position), the device can be fixed by using a ring hook: put the hook into a fixed hook of appropriate height (such as a hanging rod on the side of a nursing cart), so that the drain port of the measuring cylinder 5 is directly opposite the waste fluid collection container (the distance between the drain port and the container opening is ≤5cm), to ensure that the device is stable during the draining process and to avoid contamination caused by the device shaking and the draining deviating from the container.

[0069] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A gastric retention suction device for enteral nutrition patients, comprising a gastric tube connection assembly (1) for detachable connection with a patient's gastric tube, a negative pressure suction assembly for generating a negative pressure to extract gastric retention fluid, a volumetric metering assembly for accurately metering the volume of gastric retention fluid, a pressure regulating assembly for regulating and monitoring the suction negative pressure, and a one-way passage assembly for preventing backflow contamination of the gastric retention fluid, characterized in that, The stomach tube connecting assembly (1) is provided with a luer lock interface (2) at one end, and a three-way valve (3) is communicated at the other end of the stomach tube connecting assembly (1), and the other two ends of the three-way valve (3) are communicated with a negative pressure suction assembly and a capacity measurement assembly, respectively. The negative pressure suction assembly comprises a piston cylinder (4) for storing extracted gastric retention fluid and assisting in observing the capacity, the piston cylinder (4) is communicated with the three-way valve (3), and a scale line is arranged on the side wall of the piston cylinder (4); a pressure regulating assembly is embedded in the top of the piston cylinder (4), and the pressure regulating assembly is electrically connected with a negative pressure sensor for collecting the suction pressure in real time and a pressure display screen for displaying the pressure value. The one-way conduction assembly comprises a first one-way valve arranged between the three-way valve (3) and the capacity measurement assembly and a second one-way valve arranged between the piston cylinder (4) and the three-way valve (3), the first one-way valve is used for allowing the gastric retention fluid to flow from the three-way valve (3) to the capacity measurement assembly only, and the second one-way valve is used for allowing the gastric retention fluid to flow from the three-way valve (3) to the piston cylinder (4) only.

2. A gastric retention pumping device for enteral nutrition patients according to claim 1, characterized in that A sealing ring for enhancing the sealing performance is arranged on the inner wall of the luer lock interface (2), the cross section of the sealing ring is in a "V" type structure, the "V" type opening faces the inner side of the luer lock interface (2), and the outer periphery of the luer lock interface (2) is provided with an anti-skid pattern for improving the gripping friction.

3. A gastric retention pumping device for enteral nutrition patients according to claim 2, characterized in that A rotating switch handle (301) for switching the passage state is arranged on the side wall of the three-way valve (3), the rotating switch handle (301) is provided with a positioning lug (302) at the end for positioning the passage state, and the shell of the three-way valve (3) is correspondingly provided with three positioning grooves (303) matched with the positioning lug (302), the three positioning grooves (303) correspond to three working states of "stomach tube-suction", "stomach tube-measurement" and "closed" respectively, and when the positioning lug (302) is engaged with the positioning groove (303), the three-way valve (3) enters the corresponding working state.

4. A gastric retention pumping device for enteral nutrition patients according to claim 3, characterized in that The capacity measurement assembly comprises a measurement cylinder (5) for directly observing the gastric retention fluid and a liquid level sensor for monitoring the liquid level, and the liquid level sensor is signal connected with an audible and visual alarm, when the liquid level sensor monitors that the liquid level in the measurement cylinder (5) reaches a preset liquid level threshold, the audible and visual alarm automatically gives an audible and visual prompt.

5. A gastric retention pumping device for enteral nutrition patients according to claim 4, characterized in that A plug plate (401) for buffering the suction pressure fluctuation is arranged in the piston cylinder (4), a double-layer rubber ring is arranged between the plug plate (401) and the cylinder wall of the piston cylinder (4), the plug plate (401) is fixedly connected with a piston rod (402), an arc-shaped pressing plate (403) for reducing the hand pressing fatigue is arranged at the end of the piston rod (402), and air holes are arranged on the surface of the arc-shaped pressing plate (403).

6. A gastric retention pumping device for enteral nutrition patients according to claim 5, characterized in that The pressure regulating assembly comprises a pressure regulating spring, a pressure relief valve and a negative pressure adjusting knob, the top end of the pressure regulating spring is fixedly connected with the bottom of the negative pressure adjusting knob, and the bottom end of the pressure regulating spring is in contact with the top of the valve core of the pressure relief valve; the pressure relief valve is embedded in the top side wall of the piston cylinder (4), the inlet end of the pressure relief valve is communicated with the inside of the piston cylinder (4), and the outlet end of the pressure relief valve is communicated with the atmosphere; the negative pressure adjusting knob is screwed with the top of the pressure relief valve through threads, and the negative pressure adjusting knob is used for changing the compression amount of the pressure regulating spring, so as to adjust the opening pressure of the pressure relief valve.

7. A gastric retention pumping device for enteral nutrition patients according to claim 6, characterized in that The first one-way valve is a duckbill elastic one-way valve, and the second one-way valve is a ball core one-way valve.

8. A gastric retention pumping device for enteral nutrition patients according to claim 7, characterized in that The bottom of the piston cylinder (4) is provided with a drainage valve (6) for draining gastric retention fluid, a pull rod (7) is installed between the drainage valve (6) and the bottom of the plug plate (401), one end of the pull rod (7) is hingedly connected to the valve core of the drainage valve (6), the other end of the pull rod (7) is provided with a sliding groove (701), the side wall of the piston rod (402) is provided with a protrusion (8) matched with the sliding groove (701), the protrusion (8) is embedded in the sliding groove (701) and can slide along the sliding groove (701); When the piston rod (402) is pulled upward to the maximum stroke, the protrusion (8) slides to the top end along the sliding groove (701), the valve core of the drainage valve (6) is driven upward by the pull rod (7), the drainage valve (6) is automatically opened, and the gastric retention fluid in the measuring cylinder (5) is drained.

9. A gastric retention pumping device for enteral nutrition patients according to claim 8, characterized in that A pressure buffer cavity is arranged between the negative pressure sensor and the three-way valve (3), and a honeycomb pressure reduction structure is arranged on the inner wall of the cavity of the pressure buffer cavity.

10. A gastric retention pumping device for enteral nutrition patients according to claim 9, characterized in that The outer side of the end of the piston cylinder (4) away from the three-way valve (3) is provided with an annular hanging buckle.

Images