A liquid bag that is easy to heat-apply

Abstract

This invention provides a conveniently heat-adhesive liquid bag, belonging to the field of liquid bag technology. The conveniently heat-adhesive liquid bag includes a bag body, a heating element fixing groove, a sealing strip, and an interface tube. The bag body has a first wall and a second wall arranged opposite to each other. The peripheries of the first and second walls are connected by heat sealing to form a closed receiving cavity. The heating element fixing groove is located on the outer surface of the first wall and has a rectangular groove structure. The bottom of the heating element fixing groove is fitted to the first wall, and the four side walls of the heating element fixing groove extend outward to form limiting edges. The sealing strip is located at the top opening of the receiving cavity. One end of the interface tube passes through the sealing strip and communicates with the receiving cavity, while the other end of the interface tube extends outward to form an infusion port. This invention can solve the problem that unstable adhesion of the heating element to the liquid bag can cause uneven liquid temperature distribution, affecting the treatment effect and potentially harming the patient.

Description

Technical Field

[0001] This utility model belongs to the field of liquid bag technology, specifically, it relates to a liquid bag that is easy to heat and attach. Background Technology

[0002] In numerous applications such as medical infusion, laboratory reagent insulation, and industrial liquid heating, it is often necessary to heat or insulate bagged liquids. Traditional methods for heating liquid bags mainly fall into two categories. The first category uses external heating equipment, such as heating chambers or water baths, to indirectly heat the entire liquid bag by placing it in the heating environment. The disadvantages of this method are that the heating equipment is bulky, energy-intensive, and slow in heating speed, making it particularly difficult to implement in scenarios such as mobile medical care or on-site operations. The second category uses portable heating pads directly attached to the surface of the liquid bag for heating. This method has the advantages of portability and flexibility, but in practical applications, it faces the prominent problem of unstable adhesion of the heating pads. The surface of a conventional liquid bag... The heating element is usually a smooth thin film material, and when filled, it has an expanded arc surface structure on both sides. Therefore, the heating element is attached to the bag surface by its own adhesive force or simple binding and fixing method. During the process of suspending the infusion bag or moving it, the heating element is prone to curling and falling off due to gravity and the inflexible nature of its own heating filler. The attachment position of the heating element also indirectly leads to reduced heating efficiency and uneven temperature distribution. In medical infusion scenarios, this uneven temperature may cause discomfort to patients. Although some existing technologies have tried to improve the attachment effect by strengthening the adhesive material on the back of the heating element or using auxiliary fixing methods such as Velcro, it is easy to increase the thickness of the heat-conducting layer, which in turn affects the temperature rise of the inner bag liquid. Utility Model Content

[0003] In view of this, the present invention provides a liquid bag that is easy to heat and attach, which can solve the problem that the heating element is unstable and affects uniform heating due to the expansion arc surface of the liquid bag body.

[0004] This utility model is implemented as follows:

[0005] This utility model provides a convenient heat-attached liquid bag, including a bag body, a heating element fixing groove, a sealing strip, and an interface tube. The bag body is made of a flexible film material. The bag body has a first wall and a second wall that are arranged opposite to each other. The peripheries of the first wall and the second wall are connected by heat sealing to form a closed receiving cavity. The heating element fixing groove is disposed on the outer surface of the first wall. The heating element fixing groove has a rectangular groove structure. The bottom of the heating element fixing groove is attached to the first wall. The four side walls of the heating element fixing groove extend outward to form a limiting edge. The sealing strip is disposed at the opening of the receiving cavity. The sealing strip is connected to the top edge of the first wall and the second wall by pressing. One end of the interface tube passes through the sealing strip and communicates with the receiving cavity. The other end of the interface tube extends outward to form an infusion port.

[0006] The technical advantages of this utility model for a conveniently heat-attached liquid bag are as follows: By setting a heating element fixing groove on the outer surface of the first wall of the bag, the heating element can be stably attached to the surface of the liquid bag. The limiting edge formed by the outward extension of the four side walls of the heating element fixing groove can effectively prevent the heating element from shifting or falling off during use. At the same time, the structural design of the bottom of the heating element fixing groove fitting with the first wall ensures the heat conduction efficiency between the heating element and the liquid bag, so that the heat generated by the heating element can be quickly and evenly transferred to the liquid in the containing cavity, improving the effect and speed of liquid heating. The combination of the sealing strip and the interface tube ensures the sealing of the liquid bag and facilitates the input and output of liquid.

[0007] Based on the above technical solution, the liquid bag of this utility model that is convenient for heat application can be further improved as follows:

[0008] The length of the heating element fixing groove is set along the vertical direction of the first wall, and the width of the heating element fixing groove is less than half the width of the first wall.

[0009] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by limiting the length direction of the heating element fixing groove to be set along the vertical direction of the first wall, the heating element can cover the main stress area of ​​the liquid bag. When the liquid bag is suspended for use, the position of the heating element coincides with the main distribution area of ​​the liquid, which improves the heating efficiency. At the same time, the design that the width of the heating element fixing groove is less than half the width of the first wall avoids the problem of the heating element occupying too large an area, which would reduce the overall flexibility of the liquid bag, thus maintaining the good flexibility and adaptability of the liquid bag during use.

[0010] Furthermore, the bottom surface of the heating element fixing groove is provided with multiple parallel raised lines, which extend along the width direction of the heating element fixing groove, and a groove is formed between two adjacent raised lines.

[0011] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: multiple parallel raised lines are set on the bottom surface of the heating element fixing groove. The alternating distribution of raised lines and grooves increases the contact area and friction of the bottom surface of the groove, so that the heating element forms a stable structure with multiple points of contact with the bottom of the groove after it is installed in the heating element fixing groove. This effectively prevents the heating element from loosening due to vibration or external force during use. At the same time, the micro air layer formed by the raised lines and grooves can also play a buffering role to a certain extent, reducing the local pressure concentration of the heating element on the liquid bag wall and extending the service life of the liquid bag.

[0012] Furthermore, the height of the limiting edge is greater than the height of the raised pattern, and the inner side of the limiting edge is smoothly connected to the side wall of the heating element fixing groove.

[0013] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by setting the height of the limiting edge to be greater than the height of the ridge, when the heating element is installed into the heating element fixing groove, the limiting edge can first contact the edge of the heating element and form the main limiting function, while the ridge provides an auxiliary fixing function. This hierarchical fixing structure design makes the installation of the heating element more stable and reliable. The design of the smooth transition between the inner side of the limiting edge and the side wall of the heating element fixing groove avoids sharp corner structures and improves the safety and durability of the product.

[0014] Furthermore, the sealing strip has an inverted trapezoidal cross-section, with the top width of the sealing strip being smaller than the bottom width, and the two sides of the sealing strip forming an interlocking connection with the first and second wall surfaces.

[0015] The beneficial effects of adopting the above-mentioned improved scheme are as follows: The sealing strip adopts an inverted trapezoidal cross-section structure, and the design of the top width being smaller than the bottom width allows the sealing strip to form a wedge-shaped locking effect when it is fitted and connected with the first and second wall surfaces. As the pressing force increases, the contact pressure between the sealing strip and the wall surface gradually increases, forming a reliable sealing connection. This structural design has a more significant sealing effect when the liquid inside the liquid bag generates pressure, effectively preventing liquid leakage from the sealing strip. At the same time, the inverted trapezoidal structure also facilitates the installation and disassembly of the sealing strip, improving production efficiency.

[0016] Furthermore, the interface tube is inserted into the sealing strip at the geometric center of the sealing strip, and the interface tube and the sealing strip are sealed together by heat fusion.

[0017] The beneficial effects of adopting the above-mentioned improved scheme are as follows: setting the position where the interface tube enters the sealing strip at the geometric center of the sealing strip makes the interface tube bear the force evenly, avoiding the stress concentration problem caused by eccentric installation. A sealing connection is established between the interface tube and the sealing strip through heat fusion, forming a molecular-level bonding interface. The sealing reliability of this connection method is far higher than that of mechanical pressing or bonding methods, and it can withstand greater internal pressure without leakage. At the same time, the design of the interface tube being located at the geometric center also makes it easier for the liquid bag to maintain a balanced state when suspended or placed, reducing the inconvenience caused by the tilting of the liquid bag.

[0018] Furthermore, the outer surface of the second wall is a smooth planar structure, and the thickness of the second wall is less than the thickness of the first wall.

[0019] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by setting the outer surface of the second wall to be a smooth planar structure, the contact between the liquid bag and the support surface or suspension device is more stable and smooth when it is placed or suspended, reducing the frictional resistance and wear caused by uneven surface. The design that the thickness of the second wall is less than that of the first wall realizes the differentiated structure of the liquid bag. The first wall has a larger thickness to ensure strength because it needs to support the heating element fixing groove, while the second wall reduces the amount of material used and the overall weight by reducing the thickness. At the same time, the thinner second wall is also conducive to observing the state and level of the liquid in the containment cavity.

[0020] Furthermore, the bag body is made of medical-grade polyvinyl chloride or medical-grade polyethylene, and the sealing strip is made of thermoplastic elastomer.

[0021] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: The bag body is made of medical-grade polyvinyl chloride or medical-grade polyethylene. These materials have good biocompatibility and chemical stability, which can ensure that no harmful substances will leach out or migrate when in contact with liquids. At the same time, these materials also have excellent flexibility and heat resistance, which can meet the needs of heating. The sealing strip is made of thermoplastic elastomer material, which combines the elasticity of rubber and the processing performance of plastic. It maintains good elastic sealing effect at room temperature and can achieve reliable heat fusion connection during heat sealing. The rational selection of materials ensures the safety and practicality of the product.

[0022] Furthermore, the four corners of the heating element fixing groove have a rounded transition structure, and the radius of curvature of the rounded transition structure is the same.

[0023] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the four corners of the heating element fixing groove adopt a rounded transition structure, which avoids the stress concentration phenomenon that may be caused by the right angle structure, effectively disperses the stress, and prevents the bag from tearing or breaking at the corner position. At the same time, the uniform curvature radius design also simplifies the production process, facilitates mass production by mold forming, and reduces manufacturing costs.

[0024] Furthermore, the volume of the receiving cavity between the first wall and the second wall is 200ml~1000ml, the inner diameter of the interface tube is 3mm~8mm, and the depth of the heating element fixing groove is 2mm~5mm.

[0025] The beneficial effects of adopting the above-mentioned improved scheme are as follows: By clarifying the specific numerical ranges of the cavity volume, the inner diameter of the interface tube, and the depth of the heating element fixing groove, quantitative technical indicators are provided for the practical application of the product. The cavity volume range of 200ml~1000ml can meet the liquid volume requirements in different clinical scenarios. The design of the interface tube inner diameter of 3mm~8mm ensures the flow rate of liquid delivery while avoiding the inconvenience of connection caused by excessively large tube diameters. The setting of the heating element fixing groove depth of 2mm~5mm can accommodate heating elements of conventional thickness without affecting the heat conduction efficiency due to excessive groove depth. The reasonable configuration of these parameters enables the liquid bag to achieve the best heating effect and operational convenience in actual use.

[0026] Compared with existing technologies, the beneficial effects of this utility model's convenient heat-attached liquid bag are as follows: By setting a special heating element fixing groove structure on the outer surface of the first wall of the bag body, combined with the design of limiting edges and groove bottom ridges, the problem of the heating element being difficult to attach continuously and stably is fundamentally solved. The rectangular groove structure of the heating element fixing groove provides a stable attachment space for the heating element, and the setting of the limiting edge forms an effective physical constraint, preventing the heating element from detaching or falling off in any direction during use. The multiple parallel ridges at the bottom of the groove further strengthen the connection stability between the heating element and the liquid bag by increasing the contact area and friction. At the same time, the structure formed by the ridges and grooves also optimizes the heat conduction path, enabling the heat generated by the heating element to be quickly and evenly transferred to the liquid bag. The liquid within the containment chamber significantly improves heating efficiency and temperature control accuracy. The inverted trapezoidal cross-section design of the sealing strip, combined with the heat-fusion connection method, ensures the sealing reliability of the liquid bag. The placement of the interface tube at the geometric center of the sealing strip achieves balanced force distribution and convenient operation. The differentiated design of the second wall surface, featuring a smooth plane and a thinner profile, reduces material usage and overall weight while ensuring structural strength. The rounded transition structure at the four corners of the heating element fixing groove effectively avoids stress concentration and extends the product's service life. Through the combined effect of material selection and structural optimization, this utility model achieves stable and reliable heating attachment, high heating efficiency, and safe and convenient use. Compared with existing technologies, it represents a significant improvement in heating element fixation, heat conduction efficiency, and overall reliability. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 A side view of a liquid bag that is convenient for heat application;

[0029] Figure 2 A front view of a liquid bag that is convenient for heat application;

[0030] Figure 3 A partial schematic diagram of a heating element fixing groove for a liquid bag that is convenient for heating and attaching;

[0031] The attached diagram lists the components represented by each number as follows:

[0032] 10. Bag body; 11. Heating element fixing groove; 12. Sealing strip; 13. Interface tube; 14. First wall surface; 15. Second wall surface; 16. Limiting edge; 17. Infusion port; 18. Raised lines; 19. Groove. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0034] like Figure 1-3 The illustration shows an embodiment of a convenient heat-adhesive liquid bag provided by this utility model. In this embodiment, it includes a bag body 10, a heating element fixing groove 11, a sealing strip 12, and an interface tube 13. The bag body is made of a flexible film material. The bag body has a first wall surface 14 and a second wall surface 15 arranged opposite to each other. The peripheries of the first wall surface and the second wall surface are connected by heat sealing to form a closed receiving cavity. The heating element fixing groove is disposed on the outer surface of the first wall surface. The heating element fixing groove has a rectangular groove structure. The bottom of the heating element fixing groove is attached to the first wall surface. The four side walls of the heating element fixing groove extend outward to form a limiting edge 16. The sealing strip is disposed at the opening of the receiving cavity. The sealing strip is connected to the top edge of the first wall surface and the second wall surface by pressing. One end of the interface tube passes through the sealing strip and communicates with the receiving cavity. The other end of the interface tube extends outward to form an infusion port 17.

[0035] In the above technical solution, the length direction of the heating element fixing groove is set along the vertical direction of the first wall surface, and the width of the heating element fixing groove is less than half the width of the first wall surface.

[0036] Furthermore, in the above technical solution, the bottom surface of the heating element fixing groove is provided with multiple parallel raised lines 18, the raised lines extend along the width direction of the heating element fixing groove, and a groove 19 is formed between two adjacent raised lines.

[0037] Furthermore, in the above technical solution, the height of the limiting edge is greater than the height of the raised pattern, and the inner side of the limiting edge is smoothly connected to the side wall of the heating element fixing groove.

[0038] Furthermore, in the above technical solution, the cross-section of the sealing strip is an inverted trapezoidal structure, the top width of the sealing strip is smaller than the bottom width of the sealing strip, and the two sides of the sealing strip form an interlocking connection with the first wall surface and the second wall surface.

[0039] Furthermore, in the above technical solution, the interface tube is inserted into the sealing strip at the geometric center of the sealing strip, and the interface tube and the sealing strip are sealed together by heat fusion.

[0040] Furthermore, in the above technical solution, the outer surface of the second wall is a smooth planar structure, and the thickness of the second wall is less than the thickness of the first wall.

[0041] Furthermore, in the above technical solution, the bag body is made of medical-grade polyvinyl chloride or medical-grade polyethylene, and the sealing strip is made of thermoplastic elastomer.

[0042] Furthermore, in the above technical solution, the four corners of the heating element fixing groove have a rounded transition structure, and the radius of curvature of the rounded transition structure is the same.

[0043] Furthermore, in the above technical solution, the volume of the receiving cavity between the first wall and the second wall is 200ml~1000ml, the inner diameter of the interface tube is 3mm~8mm, and the depth of the heating element fixing groove is 2mm~5mm.

[0044] The method of using this utility model is as follows: Before use, first check whether the sealing strip and interface tube of the liquid bag are intact and undamaged, and confirm that there is no damage or leakage in the receiving cavity. Inject the liquid to be heated into the receiving cavity through the interface tube. During the injection process, the injection speed should be controlled to avoid generating excessive air bubbles. After the liquid is injected, seal the infusion port of the interface tube through the sealing strip or the matching sealing device of the interface tube. Take the heating element and check whether its size matches the heating element fixing groove. Align the heating element with the opening of the heating element fixing groove, keep the heating element parallel to the groove opening, and push the heating element smoothly into the fixing groove with moderate force. During the pushing process, pay attention to ensuring that each edge of the heating element enters the constraint range of the limiting edge evenly. When you feel that the bottom surface of the heating element is in full contact with the convex pattern of the bottom of the groove and that the surrounding area is completely limited by the limiting edge, it means that the installation is in place. Turn on the power supply of the heating element. Start heating the liquid. During the heating process, set an appropriate heating temperature and time according to the properties of the liquid and the usage requirements. For medical infusion applications, the liquid is usually heated to a temperature close to body temperature. During the heating process, the user can observe the state of the liquid in the containment cavity through the transparent or semi-transparent structure of the second wall. Pay attention to whether the liquid has reached the expected temperature and whether any abnormalities occur, such as local overheating or the formation of bubbles. After heating is completed, turn off the power of the heating element. After the heating element temperature drops naturally to a safe temperature, remove the heating element from the fixing groove. When removing it, press the outer side of the limiting edge with your fingers and gently pull the heating element upward. Use the elastic deformation of the groove to allow the heating element to smoothly detach from the constraint of the limiting edge. After the heating element is removed, the liquid bag can be hung for use or other subsequent operations can be performed. If reheating is required after use, the above operation procedure can be repeated.

[0045] The heating element fixing groove design of this utility model makes the installation and removal of the heating element simple and quick, without the need for additional tools or auxiliary devices. A single person can complete the fixing or disassembly of the heating element in a few seconds. At the same time, the fixing groove structure ensures the stability of the heating element throughout the entire process of use. No matter whether the liquid bag is suspended, laid flat or transported, the heating element is always firmly attached to the predetermined position, ensuring stable and reliable heating effect.

[0046] The following is a specific embodiment 1 of this utility model: This embodiment provides a convenient heat-adhesive infusion bag for medical infusion. The bag body is made of medical-grade polyvinyl chloride material, which has good flexibility and biocompatibility and meets the safety standards for medical devices. The first wall of the bag body has a thickness of 0.4mm, and the second wall has a thickness of 0.25mm. Both walls are 300mm in length and 180mm in width. The periphery of the first and second walls is connected by a high-frequency heat-sealing process with a heat-sealing width of 8mm, forming a closed receiving cavity with an effective volume of 500ml, which can meet the volume requirements of conventional infusion. A heating element fixing groove is provided in the middle of the outer surface. The fixing groove has a rectangular groove structure, with a length of 240mm and a width of 75mm. The length direction is set along the vertical direction of the first wall surface, and the depth of the fixing groove is 3.5mm. The bottom of the groove is tightly attached to the inner layer material of the first wall surface. The four side walls of the fixing groove extend outward to form a limiting edge, with a width of 6mm and a height of 4mm. The inner surface of the limiting edge is smoothly connected to the side wall of the fixing groove through an arc surface with a curvature radius of 2mm. Twelve parallel raised lines are evenly distributed on the bottom surface of the fixing groove. The raised lines extend along the width direction of the fixing groove, and the cross-section of each raised line is semi-circular. The raised ridges are 1.2mm high and 3mm wide, with a spacing of 18mm between adjacent ridges. The grooves formed between the ridges are 1.2mm deep. This alternating structure of raised ridges and grooves creates up to 12 line contact areas with the bottom surface of the heating element after it is attached, significantly increasing the contact area and friction. A sealing strip is installed at the top opening of the cavity. The sealing strip is made of thermoplastic elastomer material, which maintains rubber-like elasticity at room temperature and can achieve plastic deformation and molecular chain fusion at heat sealing temperature. The sealing strip has an inverted trapezoidal cross-section, with a top width of 4mm, a bottom width of 9mm, and a height of 7mm. The two sides... The sealing strip is connected to the top edges of the first and second walls at a 65° angle to the horizontal plane via ultrasonic welding to a depth of 5mm, forming a strong seal. The interface tube is made of medical-grade polypropylene with an outer diameter of 7mm, an inner diameter of 5mm, and a wall thickness of 1mm. One end of the interface tube is inserted into the geometric center of the sealing strip to a depth of 6mm. The interface tube and the sealing strip are connected via a hot-melt process, with the hot-melt temperature controlled within the range of 180℃ to 200℃ and the connection time between 3s and 5s. The resulting weld interface is 2mm wide. This connection method ensures that the sealing reliability between the interface tube and the sealing strip can withstand 0.The system withstands internal pressures exceeding 3 MPa without leakage. The other end of the interface tube extends outwards by 120 mm to form an infusion port, equipped with a standard Luer tapered connector for easy connection to infusion devices. The four corners of the heating element fixing groove feature a rounded transition structure with a uniform radius of curvature of 5 mm. This rounded design effectively avoids stress concentration that might occur with right-angle structures. The outer surface of the second wall is a completely smooth planar structure with a surface roughness controlled below 0.8 μm, facilitating stable contact between the liquid bag and the support surface during placement and allowing for easy observation of the liquid color and level within the containment cavity from the back. In this embodiment, the heating element used with the liquid bag measures 230 mm in length, 70 mm in width, and 3 mm in thickness, employing flexible heating film technology with a rated power of 15 W to 25 W. After the heating element is inserted into the fixing groove, it is completely enclosed and constrained by the limiting edge. Twelve areas on the bottom surface form line contact with the raised texture of the groove bottom, with a total contact length of 840 mm. The resulting frictional resistance is sufficient to resist various external forces caused by the weight of the heating element and deformation of the liquid bag. The device is designed for use by injecting 500ml of physiological saline into the receiving cavity and activating the heating element to heat the liquid. At an ambient temperature of 20℃, the liquid is heated from room temperature to 37℃ in just 18-22 minutes. During heating, the surface temperature distribution of the first wall is measured using an infrared thermometer, showing good temperature uniformity, with the difference between the highest and lowest temperatures not exceeding 2.5℃. After heating, a vertical tensile test is performed on the heating element, requiring a force exceeding 8N to pull it out of the fixing groove, demonstrating the reliability of the fixing structure. This embodiment of the liquid bag exhibits excellent performance in infusion warming applications in medical institutions. The heating element is stably fixed without displacement, the heating efficiency is high, and the temperature distribution is uniform. Medical staff can easily operate it without additional training. Patients experience comfort during infusion without discomfort due to excessively high or low liquid temperatures. The bag material did not soften, deform, or experience performance degradation after being continuously kept warm at 40℃ for 6 hours. All performance indicators meet the actual requirements for medical infusion warming.

[0047] The following is another specific embodiment 2 of this utility model: This embodiment is based on embodiment 1, and the bottom textured structure of the heating element fixing groove is improved and optimized. The original 12 semi-circular cross-section textures are changed to 18 trapezoidal cross-section textures. The height of each texture remains unchanged at 1.2mm, but the cross-section is changed from semi-circular to isosceles trapezoid. The top edge width of the trapezoidal texture is 2mm, the bottom edge width is 4mm, and the angle between the two sides and the bottom surface is 70°. The spacing between adjacent textures is reduced to 12mm. The increase in the number of textures increases the number of contact points between the heating element and the bottom of the groove from 12 to 18, and the total contact length increases from 840mm to 1260mm, significantly improving the friction resistance and fixing stability. The trapezoidal cross-section design has a larger lateral area than the semi-circular design. When the heating element is subjected to horizontal shear force, the trapezoidal cross-section provides a larger lateral area. The textured sides provide additional mechanical interlocking, further enhancing the anti-slip effect. Simultaneously, the top edge of the trapezoidal texture is planar, resulting in a larger contact area with the bottom surface of the heating element compared to the semi-circular texture, which improves heat conduction efficiency. Testing showed that the heating element's fixing strength in this embodiment is approximately 35% higher than in Embodiment 1. Pulling the heating element out of the fixing groove requires a pulling force exceeding 10.8N. Under the same heating conditions, the time for the liquid to heat from room temperature to 37°C is reduced to 16-20 minutes, with a heating efficiency increase of approximately 10%. Temperature uniformity is also improved, with the difference between the highest and lowest temperatures controlled within 2°C. This embodiment is particularly suitable for emergency medical scenarios requiring frequent movement or transportation. Even during ambulance transport, the heating element remains firmly attached despite bumps and vibrations, ensuring the continuity and reliability of liquid heating.

[0048] The following is another specific embodiment 3 of this utility model: This embodiment is based on embodiment 1, and the connection structure of the sealing strip and the interface tube is optimized and improved. A cylindrical through hole matching the outer diameter of the interface tube is pre-formed inside the sealing strip. The diameter of the through hole is 7.2 mm, which is 0.2 mm larger than the outer diameter of the interface tube to form a small fitting gap. The axis of the through hole coincides with the geometric center of the sealing strip. After the interface tube is inserted into the through hole, an annular boss is provided on the outer surface of the interface tube 15 mm away from the insertion end. The outer diameter of the annular boss is 9 mm and the thickness is 1.5 mm. When the interface tube is fully inserted into the sealing strip, the annular boss just reaches the top surface of the sealing strip. The annular boss and the top of the sealing strip are fused together by a hot melt process to form a dual connection structure combining mechanical snap-fit ​​and hot melt bonding. The mechanical snap-fit ​​effect of the annular boss makes it difficult for the interface tube to be pulled out when subjected to axial tensile force, while the hot melt bonding ensures that... To ensure a tight seal at the connection, the tensile strength of this dual-connection structure is approximately 60% higher than that of the simple heat-fusion connection in Example 1. It can withstand a tensile force exceeding 150N at the root of the interface tube without detachment or leakage. Simultaneously, three annular grooves are provided on the inner wall surface of the through-hole where the interface tube inserts into the sealing strip. Each groove is 0.8mm wide and 0.3mm deep, evenly distributed along the axial direction of the through-hole with a spacing of 2mm. When the interface tube is inserted into the through-hole, the material on the outer surface of the interface tube is partially melted by the heat-fusion process and flows into the annular grooves. After cooling and solidification, a mechanical interlocking structure similar to a threaded connection is formed, further enhancing the reliability of the connection. Testing showed that the interface tube connection in this embodiment can withstand an internal pressure impact of 0.5MPa while maintaining a good seal. Both the tensile strength and sealing reliability are significantly better than in Example 1. This embodiment is particularly suitable for applications involving infusion and resin heating, ensuring safety and reliability during use.

[0049] Specifically, the principle of this utility model is as follows: a heating element fixing groove is directly formed on the outer surface of the first wall of the liquid bag body, further integrating the auxiliary heating element from an external auxiliary structure into the structure of the liquid bag itself. The heating element fixing groove adopts a rectangular groove structure, with its bottom tightly fitting the first wall surface. When the heating element is attached to the inside of the fixing groove, the main body of the heating element is embedded in the groove, and the surrounding limiting edges form a physical constraint on the heating element from the horizontal direction. The outward extension of the limiting edges allows it to cover the edge of the heating element, effectively preventing the heating element from moving in any horizontal direction. Multiple parallel raised lines on the bottom surface of the groove form multi-point contact with the bottom surface of the heating element. The presence of the raised lines significantly increases the contact area and friction. When the heating element is subjected to vertical tension or the bag body is bent and deformed, the frictional resistance generated by the ridges effectively resists these external forces, preventing the heating element from falling out of the groove. The alternating structure of the ridges and grooves also forms a microscopic mechanical interlocking effect, further enhancing the reliability of the fixation. From the perspective of heat conduction, the height design of the ridges ensures the fixation effect while being controlled within a reasonable range, allowing the heating element to maintain good thermal contact with the bottom of the groove. The tiny air layer formed by the ridges and grooves is extremely thin and does not significantly hinder heat conduction. On the contrary, the increased number of contact points makes the heat transfer path more uniform, avoiding the local contact problems that may exist in planar contact. The design of the limiting edge height being greater than the ridge height... A graded fixing mechanism is implemented. The limiting edge first provides coarse positioning and main restriction for the heating element, while the raised texture provides precise fixing and anti-detachment. This structural combination ensures that the heating element is stable and secure in the fixing groove without being difficult to install or remove due to excessive constraint. The inverted trapezoidal cross-section design of the sealing strip utilizes the wedge self-locking principle. Under the action of compression force, the contact pressure between the sealing strip and the wall increases with depth, forming a tighter sealing effect. When the liquid in the cavity generates pressure, this self-locking effect is further enhanced, ensuring sealing reliability under various pressure conditions. The interface pipe is connected to the sealing strip by heat fusion. During the heat fusion process, the molecular chains of the two materials diffuse and cross-link at high temperature, forming a connection interface with high strength and sealing. This connection method offers superior performance, far exceeding the reliability of mechanical pressing or adhesive bonding. The thinner design of the second wall is based on differentiated strength requirements. The first wall needs to support the heating element fixing groove structure, hence its greater thickness to ensure strength. The second wall does not perform the fixing function, so it can be appropriately thinned to reduce weight and material costs. Furthermore, the thinner second wall facilitates observation of the liquid state from the back. The rounded transition design at the corners of the heating element fixing groove is based on stress analysis principles. The rounded structure effectively disperses stress and avoids stress concentration at sharp corners. Through the synergistic effect of these multiple structural elements, this invention fundamentally solves the technical problem of the heating element's unstable attachment, achieving an integrated fixing design between the heating element and the liquid bag.

Claims

1. A liquid bag for easy heating and attachment, comprising a bag body, a heating sheet fixing groove, a sealing strip, and a connector tube, characterized in that, The bag has a first wall and a second wall that are arranged opposite to each other. The periphery of the first wall and the second wall are connected by heat sealing to form a closed receiving cavity. The heating element fixing groove is set on the outer surface of the first wall. The heating element fixing groove has a rectangular groove structure. The bottom of the heating element fixing groove is in contact with the first wall. The four side walls of the heating element fixing groove extend outward to form a limiting edge. The sealing strip is set at the opening of the receiving cavity. The sealing strip is connected to the top edge of the first wall and the second wall by pressing. One end of the interface tube passes through the sealing strip and communicates with the receiving cavity. The other end of the interface tube extends outward to form an infusion port.

2. The liquid bag for convenient heat application according to claim 1, characterized in that, The length of the heating element fixing groove is set along the vertical direction of the first wall surface, and the width of the heating element fixing groove is less than half the width of the first wall surface.

3. The liquid bag for convenient heat application according to claim 2, characterized in that, The bottom surface of the heating element fixing groove is provided with multiple parallel raised lines. The raised lines extend along the width direction of the heating element fixing groove, and a groove is formed between two adjacent raised lines.

4. A liquid bag that is convenient for heat application according to claim 3, characterized in that, The height of the limiting edge is greater than the height of the raised pattern, and the inner side of the limiting edge is smoothly connected to the side wall of the heating element fixing groove.

5. A liquid bag for convenient heat application according to claim 4, characterized in that, The sealing strip has an inverted trapezoidal cross-section, with the top width being smaller than the bottom width. The two sides of the sealing strip are fitted into the first and second wall surfaces.

6. A liquid bag for convenient heat application according to claim 5, characterized in that, The interface tube enters the sealing strip at the geometric center of the sealing strip, and the interface tube and the sealing strip are sealed together by heat fusion.

7. A liquid bag that is convenient for heat application according to claim 6, characterized in that, The outer surface of the second wall is a smooth planar structure, and the thickness of the second wall is less than the thickness of the first wall.

8. A liquid bag that is convenient for heat application according to claim 7, characterized in that, The bag body is made of medical-grade polyvinyl chloride or medical-grade polyethylene, and the sealing strip is made of thermoplastic elastomer.

9. A liquid bag that is convenient for heat application according to claim 8, characterized in that, The four corners of the heating element fixing groove have a rounded transition structure, and the radius of curvature of the rounded transition structure is the same.

10. A liquid bag that is convenient for heat application according to claim 9, characterized in that, The volume of the receiving cavity between the first wall and the second wall is 200ml~1000ml, the inner diameter of the interface tube is 3mm~8mm, and the depth of the heating element fixing groove is 2mm~5mm.

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