Medical anti-mucous membrane adsorption type pipette

Abstract

The invention discloses a medical anti-mucous membrane adsorption type pipette, belongs to the technical field of medical nursing instruments, and aims to solve the problems that an existing pipette easily adsorbs tissues, the liquid absorption range is limited, the material adaptability is poor, and the connection sealing is insufficient. The pipette comprises a pipette body, the pipette body is of a wave-shaped tubular structure, the wall of the pipette body is provided with alternate convex parts and concave parts, the concave parts are provided with long-strip-shaped suction holes, and protrusions towards the interior of the pipette body are arranged on the inner wall corresponding to the suction holes. Adjacent concave suction holes are staggered, axial projections are not overlapped, and the edges of the suction holes are provided with anti-attachment lips. A connecting part with a check valve is arranged at the end, away from the suction hole, of the body, an annular sealing groove is formed in the inner circumferential wall of the connecting part, and a liquid-swelling silica gel sealing ring is embedded in the groove. The liquid suction device can prevent tissue adsorption, enlarge the liquid suction range, adapt to the human body structure, prevent liquid backflow and leakage and improve the liquid suction safety and efficiency, and is suitable for nasal cavity, thoracic cavity and abdominal cavity operations, pediatric wound nursing and other scenes.

Description

Technical Field

[0001] This invention relates to the field of medical nursing device technology, specifically to a medical anti-adhesive membrane adsorption type suction tube. Background Technology

[0002] In clinical medicine, suction tubes are widely used in surgical procedures, intensive care, and other scenarios, requiring efficient and residue-free suction while avoiding tissue damage and cross-infection. However, existing suction tubes have several drawbacks: most are straight tubes with no anti-adhesion design at the suction holes, making them prone to adhering to surrounding mucous membranes during use, especially during transnasal surgery, leading to poor suction; the suction holes are concentrated and their projections overlap, limiting the suction range and creating blind spots, further increasing the risk of adhesion; the materials are either too hard to fit the human body structure or too soft and unsupported, making them prone to collapse, and the straight tubes lack flow guidance, affecting operational stability; the connections have poor sealing and backflow prevention, easily leading to air leakage and liquid backflow, causing infection.

[0003] These shortcomings make it difficult for existing aspiration tubes to meet the high precision and safety requirements of clinical practice. Therefore, a new type of medical aspiration tube with anti-adsorption, wide aspiration range, flexible material, and reliable connection has been developed, which solves the technical pain points and improves the safety and efficiency of aspiration operations. Summary of the Invention

[0004] To address the shortcomings of existing suction tubes, such as easy clogging of suction holes, limited suction range, and easy damage to the mucosa, this invention provides a medical anti-mucosal adsorption type suction tube. Through the design of elongated suction holes, staggered layout of adjacent suction holes, and optimization of the flow guiding structure, it achieves the synergistic effect of preventing clogging, expanding the suction range, and protecting the mucosa.

[0005] A medical anti-adhesion suction tube is disclosed. The main body of the suction tube is a corrugated tubular structure with alternating protrusions and concave portions on the tube wall. An elongated suction hole is provided on the concave portion, and a guide cone hole protruding into the tube is provided on the inner wall of the concave portion corresponding to the position of the elongated suction hole. The elongated suction hole is formed by stretching the corrugated structure of the suction tube to make it straight, and then machining the hole corresponding to the concave portion. This solves the problem of hole position deviation and insufficient hole shape accuracy caused by the undulation of the corrugated structure. It ensures that the elongated suction hole accurately corresponds to the preset area of ​​the concave portion and that the geometric parameters of the hole meet the design requirements. Ultimately, after the tube body returns to its corrugated state, the suction hole can work synergistically with the concave portion and the guide structure to achieve the core functions of efficient liquid suction, anti-clogging, and anti-adhesion of the tube.

[0006] The suction hole is designed as a through-hole structure that runs through the thickness direction, which allows the fluid to flow unimpeded at both ends of the suction hole and ensures the stable performance of the adsorption function. The waveform structure, through the alternating distribution of convex and concave parts, not only gives the tube a certain degree of elasticity, making it easy to insert into cavities with different curvatures, but also forms a relatively flat mounting surface through the concave parts, providing a stable mounting carrier for the suction holes. At the same time, the convex parts can reduce the contact area between the tube and the mucosa inside the body, reducing the risk of friction damage.

[0007] The liquid suction tube has two structural forms: a spiral alternating concave-convex structure and an independent concave-convex structure. The former optimizes the tube's flexibility and liquid flow path through the alternating spiral concave-convex shape, while the latter enhances the tube's surface adsorption with independently set convex and concave parts. The two types of structures work together to ensure liquid suction performance.

[0008] The elongated suction orifice is the core component for the suction function. Unlike the traditional circular suction orifice, the elongated suction orifice design has two major advantages: First, with the same opening area, its length-to-width ratio can reduce the probability of secretion retention, and the liquid is more likely to flow along the long side; second, the linearly distributed orifices can disperse the suction force, avoid the single-point pressure concentration of the circular orifice, and reduce the risk of the mucosa being adsorbed and blocked.

[0009] The flow-guiding cone is a key flow-guiding structure. When the suction port draws in liquid, the liquid enters the pipe through the suction port and first comes into contact with the inclined surface of the flow-guiding cone. Since the cone apex points towards the central axis of the pipe, the inclined surface acts as a guide for the liquid, quickly directing it towards the central channel of the pipe instead of it lingering on the pipe wall near the suction port, thus reducing the blockage caused by liquid accumulation inside the suction port.

[0010] Meanwhile, the protruding structure of the conical orifice creates a tiny "diversion space" inside the tube. Even if a small amount of mucosa is drawn towards the suction orifice, it will be "pushed away" or "guided to the edge" by the inclined surface of the conical orifice, preventing the mucosa from directly adhering to the inner opening of the suction orifice and further reducing the probability of blockage.

[0011] In addition, the bevel of the conical orifice can optimize the distribution of negative pressure inside the tube, making the suction force at the suction orifice more concentrated on the liquid rather than the mucous membrane tissue, thus balancing suction efficiency and safety.

[0012] Furthermore, the elongated suction holes on two adjacent recesses are staggered, and when projected along the axial direction of the suction tube body, the elongated suction holes in the first recess and the second recess have no overlapping area.

[0013] The elongated suction holes on adjacent recesses are staggered and their axial projections do not overlap. The core principle is to avoid stress concentration by dispersing the axial distribution of the suction holes, thus preventing damage to the suction tube caused by holes concentrating on the same axis. If the elongated suction holes are aligned axially, multiple openings will be densely distributed along the same axis of the suction tube body, disrupting the continuity of the tube wall structure in that area and significantly reducing its mechanical strength. Under slight bending forces during insertion or the internal pressure during negative pressure suction, the area with concentrated openings is prone to cracking due to stress superposition, and even tube breakage. The staggered design, by distributing the suction holes circumferentially, ensures that the stress influence range of each suction hole is independent, preserving the integrity of the overall tube structure. The stress distribution is more uniform, allowing it to withstand larger bending angles and negative pressure, significantly improving the structural stability and service life of the suction tube. This layout also indirectly expands the suction range and optimizes the anti-clogging effect. However, the core principle is to avoid structural weak points by dispersing the openings and prevent damage caused by coaxial distribution of suction holes. Furthermore, the length of the elongated suction hole is not less than 1 mm, the width is not less than 0.5 mm, and the edge of the hole is provided with an outwardly folded anti-adhesion lip, the width of which is not greater than 0.1 mm.

[0014] The outward-folding anti-adhesion lip creates a tiny physical gap when the suction orifice comes into contact with the mucous membrane inside the body. This is especially suitable for delicate mucous membranes such as those of infants and young children. It reduces damage caused by direct adsorption of mucous membranes by the suction orifice and also reduces the probability of secretions adhering to the edge of the orifice. In conjunction with the linear flow characteristics of the elongated orifice, it further enhances the anti-clogging effect. At the same time, this size design takes into account manufacturing feasibility. If the lip is too wide, it will be easily deformed; if it is too narrow, it will not be able to form an effective gap, ensuring the compatibility of function and process.

[0015] The design of the elongated suction hole with a length of not less than 1 mm and a width of not less than 0.5 mm is based on the clinical need for fluid aspiration and the characteristics of the fluid. This size can ensure that fluids of different viscosities, such as wound exudate and body fluids, can pass through smoothly, and avoid blockage by tissue debris and mucus clots due to the small hole size.

[0016] Furthermore, the protrusion of the waveform tubular structure adopts an arc-shaped profile, and its cross-sectional curve adopts a continuous and smooth arc transition design without sharp corners or abrupt inflection points.

[0017] The convex arc profile and continuous smooth arc transition can eliminate the "fluid stagnation zone" and "local turbulence" caused by the sharp corners and abrupt inflection points of the cross section. The smooth arc transition can reduce the mechanical stimulation of the contact interface by increasing the contact area and reducing local pressure, which meets the biocompatibility requirements of medical devices. When the liquid flows through the corrugated tubular structure, the smooth arc surface can guide the fluid to flow continuously along the preset path, avoiding the sudden increase in local pressure or sudden change in flow velocity caused by the obstruction of sharp corners. This not only improves the liquid delivery efficiency, but also reduces the impact and wear of the fluid on the pipe wall and extends the service life of the structure.

[0018] The suction tube can be divided into three types: flexible material, rigid material, and semi-rigid material. The flexible material is suitable for situations where the suction tube is short and the patient's mucosa is fragile. Its flexibility can buffer the contact force with the mucosa during operation, reducing the risk of mechanical stimulation and damage to the fragile mucosa. The rigid material is suitable for scenarios where the suction tube is large or needs to be inserted deep into the patient's body for suction. Its structural rigidity ensures that the tube is not easy to bend or collapse during insertion, maintaining the unobstructed suction channel to ensure suction stability. The semi-rigid material is suitable for situations where the suction tube needs to bend and penetrate deep into the patient's body. It has a certain degree of deformation capability and structural support. It can adapt to bending paths to meet complex operation requirements, and can maintain the integrity of the tube shape to ensure the continuous conduction of the suction channel during insertion.

[0019] Meanwhile, the design of this invention is well-suited to the properties of the materials. That is, whether flexible or rigid materials are used, the arc-shaped contour can better utilize the mechanical properties of the materials. The flexible materials are suitable for smooth transitions and can avoid permanent deformation caused by uneven deformation at the corners. For rigid materials, it can reduce burrs and defects at the corners during processing, reduce the cost of subsequent grinding and other processes, and balance performance and production feasibility.

[0020] Furthermore, the end of the liquid suction tube body away from the elongated suction hole is provided with a connection part with a check valve.

[0021] The connection part with a check valve at the end of the suction tube away from the suction hole is used to connect with a negative pressure device (such as a manual suction bulb or an electric motor). The check valve has a one-way structure. When the negative pressure device is working, it allows the liquid or gas in the suction tube to flow towards the negative pressure device. When the negative pressure device stops working, it can automatically close to prevent the sucked liquid from flowing back into the suction tube or body. This avoids secondary contamination, ensures hygiene, maintains residual negative pressure in the suction tube, reduces suction loss, and ensures the efficiency and safety of the suction process.

[0022] Furthermore, the inner peripheral wall of the connecting part is provided with an annular sealing groove, and a silicone sealing ring that expands when exposed to liquid is embedded in the sealing groove.

[0023] The annular sealing groove on the inner wall of the connector is a groove structure surrounding the inner wall of the connector. Its function is to precisely fix the silicone sealing ring, preventing displacement of the sealing ring during docking with the negative pressure device or during use, and ensuring a stable sealing position. The liquid-swellable silicone sealing ring embedded in the sealing groove is made of medical-grade silicone with liquid-swellable properties. Even when not in contact with liquid, it can form a basic seal with the outer wall of the connector and docking device through its own elasticity. When liquid or moisture generated during the suction process comes into contact with the sealing ring, it will expand moderately due to the material properties, typically by 10%-20%, further filling the tiny gaps between the sealing groove and the docking components. Even if there are machining tolerances or slight wear in the connector or docking device, the expanded sealing ring can still fit tightly against the gaps, completely blocking the path of air or liquid leakage. This design ensures the installation stability of the sealing ring through the sealing groove, and dynamically adapts to sealing requirements by utilizing the liquid-swellable property, ensuring that the suction force generated by the negative pressure device is efficiently transmitted to the suction tube, while preventing contamination caused by liquid leakage, thus improving the sealing reliability and safety of the connection.

[0024] The advantages and beneficial effects of this invention are as follows: This suction tube achieves comprehensive performance enhancement through multiple structural optimizations: the elongated suction orifice has a larger flow area than the circular suction orifice, and its length-to-width ratio is rationally designed. Combined with the anti-adhesion lip to reduce mucosal blockage and the guiding effect of the guide cone orifice, secretions flow linearly and are less prone to stagnation, effectively reducing the blockage rate and significantly improving anti-clogging performance; the adjacent concave suction orifices are staggered (with no overlap in axial projection), forming a 360° spiral suction area along the tube body, eliminating blind spots in cleaning, significantly improving cleaning efficiency, and achieving full coverage of the suction range; made of medical-grade silicone material, it has suitable hardness, is soft and easily deformable, and the elongated suction orifice has a uniform suction distribution, avoiding local pressure concentration, greatly reducing the risk of mucosal damage, and ensuring the reliability of mucosal protection; at the same time, the check valve prevents liquid backflow and contamination, the liquid-expanding sealing ring reduces negative pressure loss, and it is compatible with various negative pressure devices, taking into account both structural stability and hygiene. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the medical anti-adhesive membrane adsorption type suction tube of the present invention; Figure 2 This is a partially enlarged schematic diagram of part A of the present invention; Figure 3 This is an enlarged schematic diagram of the interior of the recess in this invention; Figure 4 This is a schematic diagram of the connecting part structure of the present invention.

[0026] In the diagram: 1. Protrusion; 2. Recess; 3. Suction hole; 4. Anti-sticking lip; 5. Connecting part; 6. Guide cone hole. Detailed Implementation

[0027] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0028] Example 1: This embodiment is designed for scenarios where the nasal cavity is confined and the mucosa is fragile. The suction tube is a disposable product, made of medical-grade silicone material with a Shore A hardness of 20-25A, ensuring its softness to fit the curved nasal passages. The main body of the suction tube has an outer diameter of 3±0.1mm and a length of 100±5mm, facilitating precise manipulation by medical personnel to reach deep into the nasal cavity. The tube body adopts a corrugated tubular structure, with a convex portion 1 having an outer diameter of 3mm and a concave portion 2 having an outer diameter of 2.5mm. The radius of curvature of the transition section between the convex portion 1 and the concave portion 2 is 1mm, which reduces the contact area between the tube body and the nasal mucosa and prevents the tube body from collapsing due to bending.

[0029] The forming process of the elongated suction hole 3 is as follows: First, the waveform structure of the suction tube is stretched to make it straight; then, a fixing device is used to position and fix both ends of the suction tube. A pair of snap-fit ​​punching components with pins are arranged on the front and rear sides of the fixing device. After the straight suction tube is fixed to the fixing device, the punching operation is performed by the snap-fit ​​punching components. The fixing device has a suction tube rotation control function, which can drive the suction tube to rotate, thereby enabling the snap-fit ​​punching components to punch holes in the suction tube at multiple angles.

[0030] Multiple elongated suction holes 3 are formed around the perimeter of the recess 2. The suction holes 3 of adjacent recesses 2 are staggered and have no overlapping area along the axial projection. The suction holes 3 are 1.5 mm long and 0.8 mm wide, which meets the requirement of smooth passage of nasal secretions and avoids blockage caused by excessively small hole diameters. The anti-adhesion lip 4 with an outward fold at the edge of the hole is 0.2 mm wide, which can form a tiny gap when the suction hole 3 comes into contact with the nasal mucosa to prevent mucosal adsorption and damage. Corresponding to the inner wall of the recess 2 of each elongated suction hole 3, there is a guide cone hole 6 protruding into the tube. The long diameter of the cone bottom is 0.8 mm, the cone height is 0.2 mm, and the cone apex points to the axis of the tube body. It can quickly guide the inhaled nasal secretions to the central channel of the tube body and reduce the accumulation of secretions at the hole opening.

[0031] The end of the suction tube away from the suction hole 3 is equipped with a connecting part 5 with a check valve. The check valve adopts a single-lobe silicone structure, which only allows secretions to flow towards the negative pressure device. The inner circumferential wall of the connecting part 5 has an annular sealing groove with a depth of 10 mm and a width of 3 mm. A liquid-swellable silicone sealing ring is embedded in the groove. When not in contact with liquid, it achieves basic sealing through elasticity. After contact with nasal secretions, the expansion rate is about 12%, which can tightly fill the 0.1-0.2 mm gap between the sealing groove and the docking device (such as a negative pressure suction tube), ensuring that the negative pressure conduction efficiency is ≥98% and there is no air or liquid leakage.

[0032] Example 2: This embodiment is suitable for thoracic surgeries requiring large volumes of fluid, high-efficiency aspiration, and tolerance to negative pressure. The aspiration tube is for single use, and the main body is made of medical-grade silicone with a Shore A hardness of 28-30A, balancing structural strength and flexibility. The main body of the aspiration tube has an outer diameter of 5±0.1mm and a length of 300±10mm, allowing it to reach different locations within the thoracic cavity. The axial distance between the convex part 1 and the concave part 2 of the corrugated tubular structure is set to 3mm; the outer diameter of convex part 1 is 5mm, the outer diameter of concave part 2 is 4mm, and the radius of curvature of the transition section is 2.0mm, enabling it to withstand the negative pressure environment of the thoracic cavity without collapsing, while also facilitating bending according to the surgical angle.

[0033] Multiple elongated suction holes 3 are symmetrically formed in the recess 2. The suction holes 3 of adjacent recesses 2 are offset by 60° circumferentially, and their axial projections do not overlap, forming a 360° suction area to eliminate blind spots in the cleaning process. The suction holes 3 are 3 mm long and 1 mm wide, which can efficiently extract pleural effusion and avoid clogging the channels with small amounts of tissue debris in the effusion. The anti-adhesion lip 4 of the hole opening is 0.5 mm wide, which reduces adsorption and friction damage to the pleural cavity mucosa. The guide cone hole 6 on the inner wall of the recess 2, corresponding to the position of the suction hole 3, has a cone base length diameter of 3 mm and a cone height of 0.3 mm, which can quickly guide the effusion to the center of the tube body and improve the suction efficiency.

[0034] Connector 5 is adapted to negative pressure equipment for thoracic surgery. The check valve adopts a double-disc design, which has stronger sealing performance and prevents effusion from flowing back into the thoracic cavity and causing infection. The annular sealing groove of connector 5 has a depth of 15mm and a width of 6mm. It has a built-in liquid-swellable silicone sealing ring. The expansion rate after contact with effusion is about 15%. Even if there are slight machining tolerances in connector 5, it can achieve a tight seal and ensure stable negative pressure.

[0035] Example 3: This embodiment addresses the scenario of ascites drainage during abdominal surgery where leakage prevention is crucial. The suction tube is for single use, and its main body is made of medical-grade silicone with a Shore hardness of 25-27A, adaptable to irregular abdominal spaces. The main body of the suction tube has an outer diameter of 4±0.08mm and a length of 250±8mm, facilitating flexible movement within the abdominal cavity. The axial distance between the convex part 1 and the concave part 2 of the corrugated tubular structure is set to 2mm, the outer diameter of the convex part 1 is 4mm, the outer diameter of the concave part 2 is 2.4mm, and the radius of curvature of the transition section is 1mm. This design prevents the tube from breaking during operation and reduces pressure on abdominal organs.

[0036] In this embodiment, each set of recesses 2 has four elongated suction holes 3. The suction holes 3 of adjacent recesses 2 are staggered along the axial direction, and their projections do not overlap. The suction holes 3 are 2 mm long and 0.8 mm wide, which can smoothly extract ascites fluid while preventing blockage by small tissues in the abdominal cavity. The anti-adhesion lip 4 of the orifice opening is 0.09 mm wide, protecting the abdominal mucosa from adsorption damage. The guide cone hole 6 is set corresponding to the suction hole 3, with a long diameter of 1.8 mm at the bottom and a cone height of 0.04 mm, guiding the ascites fluid to quickly enter the center of the tube body and reducing retention inside the orifice opening.

[0037] The annular sealing groove of the connecting part 5 is 30mm deep and 8mm wide, and is embedded with a liquid-swellable silicone sealing ring. The expansion rate after contact with ascites is about 13%, which effectively blocks the leakage path of ascites. The check valve adopts a duckbill structure, which only allows ascites to flow unidirectionally to the negative pressure device, avoiding the backflow of ascites and contamination of the abdominal cavity when suctioning stops, which meets the aseptic requirements of abdominal surgery.

[0038] Example 4: This embodiment is designed for the extraction of exudate from pediatric patient wounds (such as small postoperative wounds). Considering the delicate nature of pediatric skin and the small wound area, the suction tube is for single use. The main body is made of medical-grade silicone with a Shore hardness of 22-24A, which is more flexible to avoid damaging children's skin and mucous membranes. The outer diameter of the suction tube is 2±0.05mm and the length is 50±5mm, making it compact and easy to accurately align with the wound.

[0039] The outer diameter of the convex part 1 of the wave-shaped tubular structure is 2mm, the outer diameter of the concave part 2 is 1.5mm, and the radius of the arc of the transition section is 0.7mm. It can bend slightly with the contour of the wound to reduce friction on the skin around the wound. The recess 2 has two elongated suction holes 3, each 2mm long and 0.5mm wide, which can efficiently extract exudate without causing wound tissue to be absorbed due to excessively large hole diameter; the anti-adhesion lip 4 of the hole opening is 0.05mm wide, thin and soft, and does not cause pressure when in contact with children's skin and mucous membranes.

[0040] The guide cone hole 6 has a long diameter of 2mm at the bottom and a cone height of 0.03mm, ensuring that exudate enters the tube quickly and avoids condensation at the orifice. The connecting part 5 is adapted to a small negative pressure suction device for pediatric use. The check valve adopts a micro silicone flap structure, which is small in size and has a reliable seal. The liquid-expanding sealing ring embedded in the annular sealing groove expands by about 10% after encountering exudate, preventing exudate leakage and contamination of the wound surface, and improving the safety of nursing care.

Claims

1. A medical liquid suction tube of the type which prevents adhesion to the mucous membrane, characterized by comprising: The pipette body is a wave-shaped tubular structure, the pipe wall has alternately arranged convex parts and concave parts, the concave parts are provided with long strip-shaped suction holes, and inner walls of the concave parts are provided with flow guide cone holes protruding into the pipe at positions corresponding to the long strip-shaped suction holes; the long strip-shaped suction holes are formed by stretching the wave-shaped structure of the pipette to be a straight pipe state and then processing the concave parts at positions corresponding to the long strip-shaped suction holes.

2. The medical anti-mucosal adsorption pipette according to claim 1, wherein The pipette is a disposable product, the long strip-shaped suction holes on two adjacent concave parts are arranged in a staggered manner, and along the axial projection of the pipette body, the long strip-shaped suction hole of the previous concave part has no overlapping area with the long strip-shaped suction hole of the next concave part.

3. The medical anti-mucosal adsorption pipette according to claim 2, wherein The length of the long strip-shaped suction hole is not less than 1 mm, the width is not less than 0.5 mm, and the edge of the hole is provided with an outwardly folded anti-adhesion lip, and the width of the anti-adhesion lip is not greater than 0.1 mm.

4. The medical anti-mucosal suction tube according to claim 1, characterized in that The convex parts of the wave-shaped tubular structure adopt an arc-shaped profile structure, and the cross-sectional curve adopts a continuously smooth circular arc transition design, without corners or abrupt inflection points.

5. The medical anti-mucosal adsorption pipette according to claim 1, wherein The end of the pipette body away from the long strip-shaped suction hole is provided with a connecting part with a non-return valve.

6. The medical anti-mucosal suction tube according to claim 5, characterized in that The inner peripheral wall of the connecting part is provided with an annular sealing groove, and a liquid-expanding silica gel sealing ring is embedded in the sealing groove.

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