Portable pressurizing infusion device

Abstract

The invention discloses a portable pressurized infusion device which comprises an elastic plate curled in an Archimedes spiral shape, a long-strip-shaped elastic liquid bag adheres to the interior of a spiral gap of the elastic plate in the length direction, and the liquid bag is communicated with an infusion tube. After liquid medicine is injected, the liquid bag expands to enable the elastic plate to be unfolded to be in a logarithmic spiral shape, and constant-pressure infusion is achieved by continuously extruding the liquid bag through elastic restoring force. A sealing mechanism and a self-sealing liquid injection head are arranged on the infusion tube, so that rapid liquid injection and safe liquid stopping are facilitated. The device is compact in structure, does not need a power supply or an inflating device, is simple and convenient to operate, and is suitable for rapid infusion treatment in environments with limited electric power and human resources, such as disaster rescue and mobile medical treatment.

Description

Technical Field

[0001] The present invention belongs to the field of medical devices, and specifically relates to a portable pressure infusion device. Background Art

[0002] In modern disaster rescue and field emergency medical environments, rapid, safe, and continuous intravenous infusion is a fundamental measure for rescuing the wounded and maintaining vital signs. However, limited by environmental conditions, power supply, and human support, the currently common pressure infusion methods all have significant limitations in the above scenarios and are difficult to meet the practical needs of the battlefield.

[0003] The current portable infusion methods mainly include the following types: Gravity infusion method: The infusion bag is suspended above the wounded, and infusion is completed through the gravity difference. This method relies on the height difference and is not suitable for prone, sitting, stretcher-carrying, or narrow battlefield environments, and is prone to interruption during vehicle-mounted or air transportation.

[0004] Cuff mechanical pressure method: A traditional sphygmomanometer cuff is wound around the liquid bag, and pressure is generated by inflating. Although the structure is simple, the pressure cannot be accurately controlled, there is a risk of excessive or insufficient pressure, which may cause the liquid bag to rupture or the infusion flow rate to be insufficient, and continuous adjustment by personnel is required, making the operation cumbersome and not conducive to rapid individual soldier disposal.

[0005] Electric pressure pump method: Controlled by a motor to drive constant pressure or constant flow output. This type of device has a high degree of automation, but it relies on batteries or external power supply, has a high equipment cost, a complex structure, and high maintenance requirements, and is not suitable for deployment in disaster-stricken environments with power outages or weak logistics conditions.

[0006] Air pressure method (balloon / manual pump inflation): This type of structure is widely used in some battlefield infusion kits. A balloon or a compressible air chamber is provided outside the liquid bag, and pressure is provided by manual inflation. Although it has a certain degree of portability, there are still the following technical problems: The pressure is uncontrollable, and it is easy to have excessive pressure causing leakage or backflow, or insufficient pressure resulting in infusion stagnation; After inflation, it is necessary to observe the liquid level and manually adjust it, and automatic pressure adjustment cannot be achieved; Both hands are required for operation or the assistance of a third person during use, which affects the rescue efficiency and is not user-friendly for individual soldier operation; In special environments such as high altitudes and low temperatures, the expansion performance of the airbag is limited, affecting the pressurization ability and response speed.

[0007] It can be seen from the above prior art that there is currently no technical solution that can truly achieve: A completely passive (no need to inflate / supply power), structurally adaptive (automatically compresses with the volume of the liquid medicine), portable (foldable, compact), adaptable to multiple body positions, vibration-resistant, and quickly deployable pressurized infusion method.

[0008] Therefore, the existing technologies generally have deficiencies such as complex operation, dependence on external forces, poor environmental adaptability, and high usage thresholds, which seriously restrict their practical applications in high-intensity and fast-response scenarios such as disaster rescue, disaster medicine, self-help and mutual rescue of individual combat injuries, and mobile platform medicine. Summary of the Invention

[0009] The purpose of the present invention is: The present invention aims to provide a portable pressurized infusion device. The present invention provides a portable pressurized infusion device that utilizes the expansion of the liquid bag to trigger the unfolding of the spiral elastic plate, and realizes continuous and balanced pressurized infusion through the elastic restoring force of the structure itself, without external energy supply, without inflating or electric equipment, and at the same time has functions such as foldable, small volume, quick deployment, and automatic sealing, and is particularly suitable for emergency infusion use in environments such as the wild, after disasters, and special operations.

[0010] The technical solution adopted by the present invention is as follows: A portable pressurized infusion device includes an elastic plate curled in an Archimedean spiral shape. A strip-shaped elastic liquid bag is adhered along the length direction in the spiral gap of the elastic plate, and the liquid bag is connected to an infusion tube. After injecting the liquid medicine, the liquid bag expands to make the elastic plate unfold into a logarithmic spiral shape, and continuous extrusion of the liquid bag is realized through the elastic restoring force to achieve pressurized infusion.

[0011] Among them, a closing mechanism is provided on the infusion tube to close the infusion tube; a liquid injection head is bypassed and inclined beside the pipe section between the closing mechanism and the liquid bag; a self-sealing structure is provided at the end of the liquid injection head, which automatically seals after injecting the liquid medicine.

[0012] Among them, the axis of the liquid injection head forms an angle of 30° - 60° with the axial direction of the infusion tube and faces the direction of the liquid bag.

[0013] Among them, the closing mechanism is a pulley clip, a sliding clip, a butterfly clip or a pliers clip.

[0014] Among them, the self-sealing structure is a positive pressure needleless connector, a pre-filled leak-proof heparin cap or a high-pressure self-sealing injection valve.

[0015] Among them, the elastic plate is a three-layer composite structure, including an outer polyurethane wear-resistant layer, an intermediate spring steel sheet support layer and an inner silicone elastic layer, and its elastic modulus ranges from 5 - 15 MPa.

[0016] Among them, the liquid bag is made of medical-grade silica gel with a wall thickness of 0.8 ± 0.1 mm, and is pre-evacuated to -80 kPa to -95 kPa and then sealed for storage; the liquid bag and the elastic plate are bonded by a biocompatible hot melt adhesive, and the bonding area is continuously distributed in a wavy shape, with a bonding width of 2-3 mm and an adjacent wave spacing of 5-8 mm.

[0017] Among them, the spiral diameter of the elastic plate in the unexpanded state is ≤ 8 cm, and after expansion, it forms a planar spiral structure with a logarithmic spiral angle of 10° - 25°, and the expansion length is ≥ 60 cm.

[0018] Among them, the polyurethane wear-resistant layer is embedded with an electrically heated wire arranged continuously in a snake shape, and both ends of the electrically heated wire are connected to a USB power supply interface to maintain the temperature of the liquid medicine in the liquid bag within the range of 30 - 37 °C.

[0019] Among them, the infusion device is equipped with an outer packaging sleeve bag that can be evacuated. When leaving the factory, the outer packaging sleeve bag is pre-evacuated to further compress and reduce the volume of the elastic plate in the initial state; a permanent magnet is installed on the elastic plate for adsorption and fixation on the surface of the wounded transfer device.

[0020] The beneficial effects of the present invention include: 1. Utilize the expansion of the liquid bag to trigger the expansion of the elastic plate, and then rely on the elastic restoring force to achieve liquid pressing, without the need for a pump or a cuff; the elastic plate always automatically adjusts its deformation to provide an equalized pressure, and can achieve stable, continuous, and safe pressurized infusion; it is particularly suitable for environments with limited power and human resources such as field rescue and disaster sites.

[0021] 2. The liquid bag can be pre-evacuated to -80 kPa to -95 kPa for sealing, improving transportation safety and the stability of the liquid medicine; when in use, the liquid can be quickly injected through the injection head, and the liquid bag immediately expands to activate the pressurization mechanism, and it only takes a few seconds to complete the preparation for automatic infusion; the structure is simple and does not require special training, and it can be quickly used by individual soldiers or without professional medical care.

[0022] 3. In the initial curled state, it only occupies the size of the palm and can be carried around by folding and packing; the spiral structure of the elastic plate makes it naturally curl tightly and will not fail or damage the liquid bag due to folding; it is suitable for carrying a spare first aid kit to improve the efficiency of self-help and mutual rescue.

[0023] 4. Traditional infusion methods rely on the patient's supine and stationary state; the device of the present invention does not rely on external suspension, gravity, or position placement, and the infusion effect is not affected by the patient's body position, and it is particularly suitable for: the wounded lying prone / on the side / semi-sitting on a stretcher; the infusion process in the environment of helicopter airlift and vehicle movement; the infusion of patients in unstable places such as water search and rescue and post-earthquake ruins. Description of the Drawings

[0024] Figure 1Schematic cross-sectional view of the infusion device in the normal state according to the first embodiment of the present invention; Figure 2 Schematic diagram of the infusion device injecting liquid according to the first embodiment of the present invention; Figure 3 Schematic diagram of the infusion device injecting liquid according to the fourth embodiment of the present invention.

[0025] In the figure, 1 is an elastic plate; 2 is a liquid bag; 3 is an infusion tube; 31 is an injection head; 32 is a pulley clip; 4 is an airbag; 41 is an inflation port; 42 is a slow-release exhaust port. Detailed implementation manners

[0026] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] Embodiment 1: Refer to Figure 1 and 2 , this embodiment discloses a portable pressurized infusion device, including an elastic plate 1, a liquid bag 2, an infusion tube 3, a closing mechanism, an injection head 31 and its supporting structures, which is suitable for rapid and safe infusion in scenarios without electricity, limited space, and tight human resources.

[0028] Structure and material of the elastic plate 1: The elastic plate 1 is in a natural curly shape, and in the initial state, it is in an Archimedean spiral structure, gradually and tightly coiling inward from the tail end. After injection, the elastic plate unfolds into a logarithmic spiral structure, and its deformation trend is convenient for generating continuous and uniform rebound pressure.

[0029] The elastic plate 1 is a three-layer composite structure: The outer layer is a polyurethane wear-resistant layer with a thickness of about 0.2 - 0.4 mm, which is scratch-resistant and waterproof; The middle layer is a spring steel sheet support layer with a thickness of 0.4 - 0.6 mm and an elastic modulus of 5 - 15 MPa, providing the main deformation recovery ability; The inner layer is a silica gel elastic layer with a thickness of 0.3 - 0.5 mm, which is used to fit the liquid bag and increase flexibility.

[0030] When the elastic plate is in the coiled state, the overall volume is controlled within a diameter of 80 mm and a height of about 25 mm, which is convenient for carrying. After unfolding, the diameter range can reach 200 - 250 mm to adapt to the complete unfolding and liquid pressing process.

[0031] Structure and bonding method of the liquid bag 2: The liquid bag 2 is a flexible strip-shaped structure, longitudinally adhered from the outer circle to the center along the spiral gap of the elastic plate 1. The liquid bag is made of medical-grade transparent silicone material with a wall thickness of 0.8 ± 0.1 mm, having good biocompatibility, tear resistance, and negative pressure resistance.

[0032] For the convenience of transportation and rapid use, the liquid bag 2 is pre-evacuated during factory production, with the vacuum degree controlled within the range of -80 kPa to -95 kPa, and can be stored in a vacuum packaging bag for a long time after encapsulation.

[0033] The bonding between the liquid bag and the elastic plate uses a hot-melt type biocompatible adhesive. The adhesive layer is continuously distributed in a wavy shape. The width of each bonding wave is 2 - 3 mm, and the distance between adjacent waves is 5 - 8 mm. This bonding structure helps to buffer local stress during the deformation process, preventing glue detachment and uneven compression.

[0034] The infusion tube 3 and the closing mechanism and the injection head 31: One end of the liquid bag is connected to the infusion tube 3 through a medical connector. The infusion tube is made of polyvinyl chloride or TPU, with an outer diameter of 3 - 4 mm and a length of 600 - 800 mm, and can be directly connected to a conventional intravenous infusion needle.

[0035] A closing mechanism is provided on the infusion tube. In this embodiment, a pulley clip 32 is selected to clamp the infusion tube to prevent the medicine liquid from flowing out in advance. In an alternative embodiment, the closing structure can also be a commonly used medical mechanical closing part such as a butterfly clip, a pliers clip, or a sliding clip.

[0036] An injection head 31 is obliquely bypassed and arranged on the infusion tube section between the pulley clip and the liquid bag. An angle is formed between its axis and the main axis of the infusion tube, and the angle range is 30° to 60°, and it is arranged towards the liquid bag direction, so that the medicine liquid can flow smoothly into the liquid bag without blockage or backflow when injected from the injection head.

[0037] A self-sealing structure is provided at the end of the injection head 31 to achieve automatic sealing after the medicine liquid is injected, avoiding air entry or medicine liquid backflow. The self-sealing structure can be selected from one of the following medical standard parts: Positive pressure needleless connector (such as Luer lock interface structure); pre-filled leak-proof heparin cap; high-pressure self-sealing injection valve, etc. After the user injects the medicine through a standard syringe connected to the injection head, this structure can quickly close after the needle is withdrawn, preventing the risks of contamination and air embolism.

[0038] Instructions for the usage process: Taking out the device: Take out this device from the vacuum packaging, and keep its Archimedes spiral coiled state; Drug injection start: Connect a syringe to the liquid injection head 31 and inject the required liquid medicine (such as normal saline, antibiotics, hemostatic agents, plasma, etc.). The liquid bag will quickly expand, and the elastic plate will be automatically unfolded into a logarithmic spiral. Before injecting the liquid medicine, the infusion tube needs to be sealed through a self-sealing structure to prevent the liquid medicine from flowing out of the intravenous infusion needle. Pressurized infusion: After the liquid medicine is filled, the elastic plate continues to rebound, applying a uniform external pressure to the liquid bag to form a stable and sustainable pressurized infusion process. Process regulation: If it is necessary to temporarily adjust the infusion volume or interrupt the infusion, the pulley clamp can be used to adjust or close the infusion tube. Infusion completion: When the liquid medicine infusion is completed, the device can be discarded as a whole. This device is specially designed to adapt to the following environments: casualties in non-supine positions such as prone / side-lying / sitting positions; platforms with large vibrations or limited space such as stretchers, helicopters, vehicles, etc.; no external power supply is required, no air injection or other manual pressure application operations are needed; the structure can be compactly folded, and a single soldier can carry 10 - 20 sets of spare parts with him; the drug injection start time does not exceed 10 seconds, and the average infusion speed can reach 200 - 300 mL / min (related to height, tube diameter, and liquid medicine viscosity).

[0039] Embodiment 2: To address the clinical problem that the liquid medicine may become thick or even freeze due to low temperature in special environments such as high cold and high altitude, an electric heating wire structure is embedded in the outer polyurethane wear-resistant layer of the elastic plate 1 in this embodiment.

[0040] The electric heating wires are arranged continuously in a snake shape, embedded in the middle thickness direction of the polyurethane layer (at a distance of 0.2 mm from the outer surface), and continuously arranged along the spiral structure of the elastic plate, spiraling from the outer circle to the inner circle of the elastic plate to ensure that the liquid medicine is always within the low-temperature protection heating zone during the infusion process.

[0041] The heating wires use PTC self-limiting temperature alloy heating wires or carbon fiber heating wires, with a rated voltage of 5V DC voltage, and both ends are connected to a standard USB Type-A interface plug. This USB interface can be connected to a mobile power supply, the medical auxiliary interface of field rescue equipment, or powered through the USB power supply module of the medical terminal.

[0042] To prevent local overheating, a PTC temperature-limiting resistor and a thermal fuse are installed in series in the electric heating circuit in this embodiment, and the power supply is automatically cut off when the temperature exceeds 42°C.

[0043] The heating module maintains the temperature of the liquid bag through conduction. In the case of an ambient temperature of 0 - 5°C, it can maintain the temperature of the liquid medicine within the range of 30 - 37°C (error ±2°C), ensuring the drug effect and reducing the risk of vasospasm caused by cold, and is especially suitable for infusion requirements in high-altitude, cold-region training or extreme disaster areas.

[0044] In this embodiment, the electric heating wire is not attached to the outside of the infusion device as an independent module, but is integrally embedded within the polyurethane wear-resistant layer on the outer layer of the elastic plate 1. This integrated design not only reduces the structural complexity and improves the compactness, but more importantly, it realizes the functions of efficient heat contact conduction and heat preservation control by means of the unique "spiral elastic plate fitting liquid bag structure" of the present invention, bringing the following beneficial effects that cannot be achieved by the prior art: Form a heat wrapping surface by closely contacting the liquid bag throughout the process: The liquid bag 2 is arranged longitudinally along the inner side of the spiral elastic plate in a fitting manner. During the unfolding and rebounding processes of the elastic plate, it always forms a uniform wrapping and constant pressure attachment to the liquid bag, so that the electric heating wire forms an encircling heat transfer belt, ensuring a continuous and stable thermal coupling interface between the liquid medicine and the heat source.

[0045] The elastic plate presses the liquid bag to evenly conduct heat: Different from the traditional surface heat application or air heat transfer structures, the present invention uses the rebounding pressing force of the elastic plate to tightly attach the liquid bag to the heating layer, significantly improving the heat transfer efficiency per unit area, avoiding problems such as heat loss and uneven heating and cooling, and is especially suitable for continuous use in winter or cold regions.

[0046] The elastic plate structure naturally has the function of a heat preservation "wrapping layer": The polyurethane wear-resistant layer and the silicone elastic layer itself have good heat insulation and heat buffering properties. When the power is not on or the power supply is disconnected, the temperature of the liquid medicine can still be maintained within a relatively constant range and slowly decrease, effectively extending the constant temperature time, and it is a natural structure for passive heat preservation.

[0047] The structural cooperation brings an efficient and low-energy-consuming temperature control mechanism: Because the heating wire always adheres to the surface of the liquid bag, the heat loss is small, and only 5V USB power supply is required to raise the temperature of the liquid medicine from 10°C to 35°C within 5 to 10 minutes, which is much lower than the power consumption and reaction time of traditional external heating modules.

[0048] Suitable for mobile high-interference environments such as disaster areas and the wild: There is no need to attach an electric heating box or a temporary heat preservation bag. The entire heating structure is integrally encapsulated in the elastic plate, without exposed heating devices, and has excellent earthquake resistance, impact resistance and portability. It is especially suitable for areas where it is difficult to infuse liquid medicine such as low-temperature fields, mountains, snow fields and plateaus.

[0049] Embodiment 3: This embodiment is further equipped with a vacuumable outer packaging sleeve bag, which is made of a multi-layer aluminum-plastic composite film and has high oxygen barrier, moisture-proof and puncture-proof properties. The sleeve bag is sealed by a standard heat-sealing process and is provided with a one-way check valve interface, which can be connected to a vacuum pump for vacuuming operation.

[0050] After assembly, the entire infusion device, together with the elastic plate, liquid bag, infusion tube, sealing mechanism, etc., is placed into this outer packaging bag, and a secondary vacuuming process is carried out before leaving the factory to form a low-pressure packaging state with an ambient pressure of 20 - 30 kPa. This operation can further force the elastic plate to shrink to the minimum volume state, significantly reducing the overall volume of the device (it can be compressed to within 40 mm in thickness and 60 mm in diameter), facilitating batch transportation and allowing paramedics to carry it easily.

[0051] In addition, to improve the fixing stability of the device in a mobile environment, a plurality of permanent magnets (such as neodymium iron boron magnets) are evenly installed along the annular edge on the outer side of the elastic plate 1. Each magnet has a size of 8 mm in diameter and 2 mm in thickness, and the magnetic strength is above N35 level.

[0052] These permanent magnets can be adsorbed on the surfaces of medical transportation equipment such as stretchers, ambulance floors, helicopter stretchers, and metal bed frames when in use, preventing the device from slipping, flipping, or falling off due to vibration, improving the reliability of use, and being particularly suitable for high-dynamic application scenarios such as airdrop rescue, rapid transportation, and on-vehicle first aid.

[0053] In this embodiment, the outer packaging bag is not a simple transportation shell independent of the structure, but combines with the unique Archimedean spiral elastic plate structure of this device to form a high degree of coordination in multiple dimensions such as packaging form control, space compression, anti-pollution, and vacuum maintenance, achieving multiple beneficial effects that cannot be achieved by the prior art: The Archimedean spiral structure is naturally easy to compress, and the vacuum packaging coordinates with the compression structure to minimize the volume: When the elastic plate is not unfolded, it is in the form of an Archimedean spiral curl. Its structural characteristics enable it to naturally curl inwards and stack evenly; during the vacuum packaging process, the negative pressure of air extraction can force the elastic plate to be further compressed tightly along the spiral direction, and the liquid bag is also bound in the narrow winding gap; this structure makes the vacuum compression efficiency extremely high, and the overall thickness of the device can be compressed to about 40% - 50% of the initial volume, significantly improving the carrying density and logistical transportation efficiency, and solving the problem of the bulky volume and unfavorable deployment of traditional devices.

[0054] The vacuum outer packaging forms a stable environment to ensure the long-term stability of the vacuum state of the liquid bag: The liquid bag is pre-vacuumed to -80 kPa to -95 kPa to avoid premature expansion of the device, but in the traditional structure, the liquid bag is extremely likely to lose the pre-vacuum state due to transportation shock, poor sealing, or aging of the sealing material; The present invention uses an outer packaging bag that can be vacuumed twice to form a low-pressure protection environment through the outer bag. The double-layer negative pressure is superimposed, effectively slowing down the rise of the internal pressure of the liquid bag; The vacuum packaging also reduces the external gas permeability, avoiding moisture absorption, deformation, or premature expansion of the liquid bag, and effectively improving the storage stability and disaster reliability at the time of leaving the factory.

[0055] Vacuum packaging provides triple protection against sterilization, contamination prevention, and moisture-proofing: In this embodiment, an aluminum-plastic composite high-barrier material (such as a PET / PE / aluminum / PET structure) is used, which has good oxygen barrier, waterproof, and antibacterial capabilities; the vacuum environment can effectively prevent the penetration of external air, water vapor, and harmful microorganisms, significantly reducing the risk of liquid medicine contamination; for common pollution sources such as sediment, rain, snow, and blood stains in the battlefield environment, vacuum packaging provides complete physical isolation, ensuring that the device is in a completely pollution-free, sealed, and controllable state before actual use.

[0056] Vacuum packaging is activated immediately upon opening and forms a "self-activating" usage mode in cooperation with the automatic expansion of the elastic plate: The user only needs to tear open the vacuum packaging bag, and the elastic plate immediately restores its elastic deformation at the moment of pressure loss, and the device automatically rebounds and unfolds; before adding medicine, the liquid bag remains in an unexpanded state, ensuring that there is no premature pressurization; this mode greatly improves the usability and reaction speed of single-person and non-professional rescue personnel, meeting the "open and use immediately" operation requirements for first aid in the wild.

[0057] Example 4: Refer to Figure 3 , although the elastic plate with an Archimedes spiral structure can provide a continuous squeezing force for the liquid bag to achieve automatic pressurized infusion, and compared with traditional inflatable pressurized infusion, the stability of its infusion pressure is significantly improved, there is still room for further improvement in the stability of the infusion pressure. Specifically, in the initial stage of infusion, since the elastic plate 1 is in a strongly deformed state, its resilience is relatively large; while in the later stage of liquid medicine use, the volume of the liquid bag decreases, and the rebound degree of the elastic plate 1 is limited, and the squeezing force on the liquid bag weakens accordingly, which may lead to a decrease in the flow rate. To solve the above problems, in this embodiment, on the basis of the structure of the elastic plate 1, a set of auxiliary structures for dynamically adjusting the pressure is added: that is, a flexible long strip-shaped airbag 4 is adhesively arranged on the side of the elastic plate 1 along its length direction, and the airbag can dynamically adjust its own rigidity at different stages of infusion to achieve a balanced output of the resilience of the elastic plate.

[0058] The airbag 4 is made of a medical TPU multi-layer film material, and its shape is a strip-shaped structure, with a width of about 10 - 15 mm and a thickness of about 8 - 12 mm (in the inflated state), and its length is the same as that of the elastic plate, and it is adhesively arranged on the outer edge along the spiral length direction of the elastic plate to ensure that it always fits and deforms synchronously during the deformation of the elastic plate.

[0059] Both ends of the airbag are respectively provided with: Inflation port 41: Located at one end of the airbag, connected to a manual inflation interface for inflation before use; Slow-release exhaust port 42: Located at the other end of the airbag, equipped with a micro single-way flow-limiting diaphragm valve, which can control the internal gas to be slowly released at a constant rate, and the exhaust rate is 0.1 - 0.3 mL / min, allowing the pressure to be slowly released to zero within 10 - 30 minutes.

[0060] The airbag is fixed on the surface of the elastic plate through a medical biological adhesive, and the bonding strength > 0.3 MPa, which is sufficient to withstand the stress brought during the spiral unfolding / rewinding process, without falling off or slipping.

[0061] Usage method and working process: Start liquid injection: After the liquid medicine injection is completed, the user uses a syringe or a small inflatable balloon to inflate the airbag through the air inlet 41 with a pressure of 10 - 30 kPa, so that it forms a certain rigidity in the initial state. The airbag produces a reverse supporting effect on the elastic plate, offsetting part of the pressure output with too strong initial resilience, making the extrusion force of the liquid bag more gentle and stable.

[0062] Dynamic slow release: During the whole infusion process, the slow release exhaust port 42 automatically and slowly releases the air in the airbag, making the rigidity of the airbag gradually decrease, thereby gradually releasing the resilience of the elastic plate, realizing the pressure regulation migration from weak to strong, and effectively compensating for the insufficient resilience of the elastic plate in the later stage.

[0063] Infusion completion: After the airbag is exhausted, the elastic plate is in a natural fitting state, the liquid bag is basically emptied, and the infusion process ends stably.

[0064] This slow release airbag structure can dynamically adjust the resilience degree of the elastic plate, making the extrusion force more stable during the whole infusion process, effectively avoiding the flow rate problem of "too fast in the initial stage and too slow in the later stage".

[0065] It can keep the infusion flow rate stable, and is especially suitable for scenarios with high requirements for flow control accuracy, such as high - concentration liquid medicines (albumin, mannitol), slow - drip liquid medicines, and fluid replacement for critically ill patients.

[0066] Avoid catheter impact or patient discomfort caused by too high initial pressure, and also prevent infusion pipeline backflow or blockage caused by insufficient pressure at the end stage.

[0067] This structure does not require a power source or complex sensing devices, and realizes automatic adjustment only through material compliance and micro - valve control, and is especially suitable for battlefields, disaster areas, and power - off environments.

[0068] The above are only the preferred embodiments of the present invention, and are not used to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A portable pressurized infusion device, characterized in that: It includes an elastic plate (1) curled in an Archimedean spiral shape, with a strip-shaped elastic liquid bag (2) adhesively attached along the length direction within the spiral gap of the elastic plate. The liquid bag (2) is connected to an infusion tube (3); after injecting the medicinal liquid, the liquid bag (2) expands to make the elastic plate (1) unfold into a logarithmic spiral shape, and continuous extrusion of the liquid bag is achieved through the elastic restoring force to perform pressurized infusion.

2. The device according to claim 1, characterized in that: A closing mechanism is provided on the infusion tube (3) to close the infusion tube (3); a liquid injection head (31) is obliquely bypassed beside the pipe section between the closing mechanism and the liquid bag (2); a self-closing structure is provided at the end of the liquid injection head (31) to automatically close after injecting the medicinal liquid.

3. The device according to claim 2, characterized in that: The axis of the liquid injection head (31) forms an angle of 30° - 60° with the axial direction of the infusion tube and faces the direction of the liquid bag.

4. The device according to claim 2, characterized in that: The closing mechanism is a pulley clip (32), a sliding clip, a butterfly clip or a pliers clip.

5. The device according to claim 2, characterized in that: The self-closing structure is a positive pressure needleless connector, a pre-filled leak-proof heparin cap or a high-pressure self-sealing injection valve.

6. The device according to claim 1, characterized in that: The elastic plate (1) is a three-layer composite structure, including an outer polyurethane wear-resistant layer, an intermediate spring steel sheet support layer and an inner silicone elastic layer, and its elastic modulus ranges from 5 to 15 MPa.

7. The device according to claim 1, characterized in that: The liquid bag (2) is made of medical-grade silicone with a wall thickness of 0.8 ± 0.1 mm, pre-evacuated to -80 kPa to -95 kPa and then sealed for storage; the liquid bag (2) is bonded to the elastic plate (1) by a biocompatible hot melt adhesive, and the bonding area is continuously distributed in a wavy shape, with a bonding width of 2 - 3 mm and an adjacent wave spacing of 5 - 8 mm.

8. The device according to claim 1, characterized in that: The spiral diameter of the elastic plate (1) in the unexpanded state is ≤ 8 cm, and after unfolding, it forms a planar spiral structure with a logarithmic spiral angle of 10° - 25°, and the unfolding length is ≥ 60 cm.

9. The device according to claim 6, wherein: The polyurethane wear-resistant layer is embedded with an electrically heated wire arranged continuously in a snake shape, and both ends of the electrically heated wire are connected to a USB power supply interface to keep the temperature of the medicinal liquid in the liquid bag within the range of 30 - 37 °C.

10. The device according to claim 1, characterized in that: The infusion device is equipped with an outer packaging sleeve bag that can be evacuated. When leaving the factory, the outer packaging sleeve bag is pre-evacuated to further compress and reduce the volume of the elastic plate (1) in the initial state; a permanent magnet is installed on the elastic plate (1) for adsorption and fixation on the surface of the wounded transfer equipment.

Images