Multifunctional carrying equipment for medical treatment after air transportation

Abstract

The multifunctional carrying equipment comprises a stretcher main frame, MEMS acceleration sensors are arranged at the four corners of the bottom of the stretcher main frame respectively, and acceleration and angular velocity data of all the corners are collected in real time; the buffering devices comprise air bags and damping spring assemblies, and the air bags and the damping spring assemblies are arranged at the four corners and the two side edges of the stretcher main frame respectively; the stretcher bearing plate is arranged above the stretcher main frame; the aviation docking module comprises an oxygen supply interface, a negative pressure suction interface and a data port, and is longitudinally distributed on the upper surface of the stretcher main frame; the control module generates an air bag pressure adjusting instruction according to data of the MEMS acceleration sensor, the air bag pressure of the four air bags is adjusted, and the stretcher bearing plate is made to be in the horizontal position. According to the equipment, it can be guaranteed that the stretcher bearing plate is located at the horizontal position, bumping in the flying process is effectively dealt with, vibration damage to the body of a patient caused by flying bumping can be effectively relieved, and good protection is provided for the body of the patient.

Description

Technical Field

[0001] The present invention relates to the field of medical equipment, and more particularly to a multifunctional transport device for air transport of medical equipment. Background Art

[0002] In today's complex and challenging modern medical rescue system, air transport plays an irreplaceable key role, especially when dealing with critical situations where medical resources are scarce in remote areas or emergency disasters suddenly strike, causing a large number of critically ill patients to urgently need treatment. Air transport can transfer patients to advanced medical centers with sophisticated equipment and advanced technology as quickly as possible, thereby gaining extremely precious treatment time for patients and becoming an important guarantee for prolonging the hope of life.

[0003] However, the existing means of transportation for patients or disabled people have exposed many serious deficiencies in the special environment of air transportation. Take ordinary stretchers as an example. The aircraft cabin has a unique and complex space layout, narrow aisles, and irregular cabin structures, which make it difficult to carry and place ordinary stretchers. In addition, during the flight, the aircraft will inevitably be affected by airflow, causing turbulence and shaking. Due to the lack of targeted shock absorption and fixing design, ordinary stretchers are difficult to provide stable support for patients in such a bumpy state. Not only is it difficult for patients to have a comfortable experience, but their safety is also threatened at all times. Secondary injuries may occur at any time due to the instability of the stretcher, and it is impossible to create a stable, comfortable and safe air transportation environment for patients.

[0004] Looking at some of the existing so-called dedicated transportation tools, although they take into account the transportation needs of patients to a certain extent, they are seriously lacking in careful design for the special needs of air transportation. The interior of the aircraft is equipped with a series of advanced medical equipment, designed to provide necessary life support and monitoring for patients during the flight. However, these dedicated transportation tools have extremely poor compatibility with the medical equipment inside the aircraft, and problems such as interface mismatch and poor data transmission frequently occur. This directly leads to the difficulty of medical staff to conduct continuous and effective vital sign monitoring of patients with the help of equipment on the aircraft during the flight. Once the patient's condition suddenly changes, emergency medical intervention cannot be carried out in time, which greatly limits the treatment effect on the patient. Summary of the invention

[0005] The present invention provides a multifunctional transport device for air transport of medical evacuations, which can not only ensure that a stretcher support plate is always in a horizontal position, effectively coping with turbulence during flight, but also effectively reduce vibration damage to the patient's body caused by flight turbulence, thereby providing good protection for the patient's body, but also can monitor important vital signs, thereby comprehensively improving the transportation safety, comfort and convenience of treatment of patients during air transport medical rescue.

[0006] In order to achieve these purposes and other advantages of the present invention, a multifunctional transport device for air transport medical evacuation is provided, comprising: The stretcher main frame has a MEMS acceleration sensor installed at each of the four corners at the bottom to collect the acceleration and angular velocity data of each corner in real time and transmit the collected data to the control module; A buffer device, comprising an air bag and a shock absorbing spring assembly, wherein an air bag is respectively arranged at four corner positions of the upper surface of the stretcher main frame, and a plurality of shock absorbing spring assemblies are respectively arranged at two side positions of the stretcher main frame; wherein each air bag is connected to the control module; A stretcher supporting plate, which is arranged above the stretcher main frame and fixedly connected to the buffer device; An aviation docking module, which includes an oxygen supply interface, a negative pressure suction interface and a data port, and is longitudinally distributed on the upper surface of the stretcher main frame; The control module generates an airbag pressure adjustment instruction according to the data collected by the four MEMS acceleration sensors, and adjusts the airbag pressures of the four airbags respectively, so that the stretcher support plate is in a horizontal position.

[0007] Preferably, it also includes a life support module, which is integrated on the side wall of the end of the stretcher main frame close to the head. The life support module includes a monitoring device, a defibrillator and a simple respirator. The monitoring device is used to monitor the electrocardiogram, blood pressure, blood oxygen saturation and respiratory rate. The monitoring device has a built-in power management system, which displays the power level in real time and triggers an alarm when it is lower than a threshold. The monitoring device and the airborne medical main control terminal adopt both wired and wireless dual-channel modes.

[0008] Preferably, an airbag is respectively arranged at the four corner positions of the upper surface of the stretcher main frame, specifically: an airbag groove is dug downward at the four corner positions of the upper surface of the stretcher main frame, and each airbag is arranged in one of the airbag grooves; a high-pressure gas cylinder is integrated inside the stretcher main frame, and each airbag is connected to the high-pressure gas cylinder through an air path; a solenoid valve is arranged on each air path, wherein a pressure sensor is arranged inside each airbag, and the pressure sensor and the solenoid valve are both communicatively connected with the control module, and the side wall of the airbag groove is inclined at 5-10 degrees, wherein the gas in the airbag and the high-pressure gas cylinder is nitrogen.

[0009] Preferably, the control module generates an airbag pressure adjustment instruction to adjust the airbag pressures of the four airbags, specifically: A data processing module, which is used to receive the attitude data, environmental data and pressure feedback data collected by four MEMS acceleration sensors in real time and perform pre-processing; A flight phase identification module, which is connected to the data processing module and determines the current flight phase according to the data preprocessed by the data processing module, wherein the flight phase includes: take-off / landing phase, turbulence phase and cruise phase, wherein each phase corresponds to a different PID parameter preset; Decoupling control calculation module, which converts the attitude angle into the target pressure through a 4×4 coupling matrix and performs dynamic coupling update. When the pressure change rate of one of the airbags is greater than 20kPa / s, the self-coupling coefficient is reduced by 2% and the cross-coupling coefficient is increased by 2%; Adaptive PID control module, which performs error calculation, PID term calculation and output pressure command for each airbag independently; The pressure-PWM conversion module is used to convert the output pressure command into a solenoid valve control signal.

[0010] Preferably, the groove wall of the airbag groove is composed of a carbon fiber matrix and a PTFE lining, an annular groove is prefabricated on the periphery of the airbag, and a pneumatic lip sealing ring is arranged in the annular groove, with the lip facing the inner wall of the airbag groove.

[0011] Preferably, a plurality of shock-absorbing spring assemblies are respectively arranged on both sides of the stretcher main frame, specifically: Two or three spring compartments are respectively arranged on both sides of the stretcher main frame, and an annular groove is arranged on the inner wall of each spring compartment. A spring is placed in the spring compartment and compressed, and an elastic retaining ring is expanded and embedded in the annular groove. The spring is released to make it rebound to a pre-compressed state and is limited by the elastic retaining ring.

[0012] Preferably, an extension wing is respectively provided on both side edges of the stretcher main frame, and the extension wing is made of carbon fiber honeycomb sandwich panels; the extension wing is connected to the side of the stretcher main frame through a titanium alloy hinge, and a self-locking gas rod is provided under the extension wing, one end of the self-locking gas rod is rotatably connected to the lower surface of the extension wing, and the other end is rotatably connected to the side wall of the stretcher main frame, wherein an environmentally adaptive shadowless lamp is provided on the side of the upper surface of the stretcher main frame, and an elastic card slot is provided on the edge of the extension wing, which can be compatible with a standard surgical instrument tray; a surgical chair is also provided on the side of the stretcher main frame, wherein the surface of the extension wing and the surface of the titanium alloy hinge are covered with an antibacterial coating.

[0013] Preferably, the stretcher main frame is fixedly connected to the cabin floor through a rotary quick-release lock, the bottom of the rotary quick-release lock protrudes downward from the stretcher main frame by 50 mm and is directly engaged with the cabin floor anchor point, a 5-10 mm gap is retained between the bottom of the stretcher main frame and the cabin floor, and polyurethane foot pads are arranged at the four corners of the bottom of the stretcher main frame to provide temporary support when the rotary quick-release lock is not engaged with the cabin floor anchor point.

[0014] Preferably, the stretcher main frame includes: a main frame and a U-shaped frame arranged at both ends of the main frame, and the U-shaped frame is slidably connected to the main frame via guide rails. Specifically, guide rails are arranged inside the two side edges of the stretcher main frame, and sliders corresponding to the guide rails are arranged on the U-shaped frame. Magnetic stainless steel strips are pre-embedded on the inner side of the guide rails, and an electromagnet is integrated on the slider of the U-shaped frame to facilitate locking of the guide rails and the slider.

[0015] Preferably, the stretcher main frame is made of carbon fiber composite material, a detachable cushion is provided at the end of the stretcher support plate, and the airbag is a medical silicone airbag.

[0016] The present invention has at least the following beneficial effects: First, by setting MEMS acceleration sensors at the four corners of the bottom of the stretcher main frame, the acceleration and angular velocity data of each corner can be collected in real time and accurately. The control module generates airbag pressure adjustment instructions based on these data, dynamically adjusts the pressure of the four airbags, ensures that the stretcher support plate is always in a horizontal position, can effectively cope with the turbulence during the flight of the aircraft, provides stable support for the patient, and greatly reduces the risk of patient injury due to turbulence. The data processing module, flight stage identification module, decoupling control calculation module, adaptive PID control module and pressure-PWM conversion module in the control module work together to achieve intelligent and precise control of airbag pressure. According to different PID parameter presets corresponding to different flight stages (take-off / landing stage, turbulence stage and cruise stage), it can more efficiently cope with various complex situations during the flight; when the airbag pressure change rate is greater than a certain value, the dynamic adjustment of the self-coupling coefficient and the cross-coupling coefficient further improves the accuracy and stability of airbag pressure regulation.

[0017] Second, the airbags and shock-absorbing spring components in the buffer device work together. The airbags are distributed at the four corners of the upper surface of the stretcher main frame, which can provide flexible buffering in the vertical direction to absorb the impact of bumps; the multiple shock-absorbing spring components set on both sides further enhance the shock-absorbing effect in the horizontal direction. This all-round buffer design can effectively reduce the vibration damage caused by flight turbulence to the patient's body and provide good protection for the patient's body.

[0018] Third, the oxygen supply interface, negative pressure suction interface and data port equipped in the aviation docking module are vertically distributed on the upper surface of the stretcher main frame, which is convenient for quick and accurate docking with medical equipment inside the aircraft. This greatly improves the convenience and timeliness of medical treatment for patients during the flight, and ensures that medical staff can use the medical resources on the aircraft to continuously and effectively monitor the vital signs and conduct emergency medical intervention for patients.

[0019] Fourth, the life support module integrates key equipment such as monitoring equipment, defibrillator and simple respirator. The monitoring equipment can not only monitor important vital signs such as ECG, blood pressure, blood oxygen saturation and respiratory rate in real time, but also has a built-in power management system that can display the power in real time and trigger an alarm when it is below the threshold to ensure the normal operation of the equipment. At the same time, the monitoring equipment and the onboard medical main control terminal adopt wired and wireless dual-channel mode to ensure the stability and reliability of data transmission, providing comprehensive and powerful support for the patient's life safety.

[0020] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a side structural schematic diagram of the multifunctional transport equipment for air transport medical evacuation of the present invention; Figure 2 It is a schematic diagram of the side structure of the extended wing of the multifunctional transport equipment for air transport medical evacuation of the present invention; Figure 3 It is a schematic diagram of the relationship between modules inside the control module of the present invention. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0023] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0024] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials can be obtained from commercial sources unless otherwise specified; in the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "set" should be understood in a broad sense, for example, they can be fixedly connected, set, or detachably connected, set, or connected and set in one piece. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in specific circumstances. The orientation or position relationship indicated by the terms "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0025] like Figure 1~Figure 3 As shown, an embodiment of the present invention provides a multifunctional transport device for air transport of medical evacuation, comprising: The stretcher main frame 1 has a MEMS acceleration sensor 3 disposed at each of the four corners at the bottom thereof, which collects acceleration and angular velocity data of each corner in real time and transmits the collected data to the control module; A buffer device, comprising an airbag 5 and a shock-absorbing spring assembly, wherein an airbag 5 is respectively arranged at the four corner positions of the upper surface of the stretcher main frame 1, and a plurality of shock-absorbing spring assemblies are respectively arranged at the two side positions of the stretcher main frame 1; wherein each airbag 5 is connected to the control module; A stretcher supporting plate 2, which is arranged above the stretcher main frame 1 and fixedly connected to the buffer device; An aviation docking module, which includes an oxygen supply interface, a negative pressure suction interface and a data port, and is longitudinally distributed on the upper surface of the stretcher main frame 1; The control module generates an airbag 5 pressure adjustment instruction according to the data collected by the four MEMS acceleration sensors 3 , and adjusts the airbag pressures of the four airbags 5 respectively, so that the stretcher supporting plate 2 is in a horizontal position.

[0026] Specifically, the stretcher main frame 1 is made of carbon fiber composite material, and the airbag 5 is made of medical silicone airbag.

[0027] In the above embodiment, the stretcher main frame 1 is made of carbon fiber composite material as a whole. This material has the characteristics of high strength and low density. Compared with traditional metal materials, it can effectively reduce the overall weight of the equipment, facilitate transportation and operation in the aircraft cabin, and ensure the structural stability of the frame in a turbulent flight environment. For example, the length of the stretcher main frame 1 is designed to be 2000mm, the width is 800mm, and the height is 300mm, so that the stretcher main frame 1 can adapt to most aircraft cabin spaces and provide a relatively spacious and comfortable support area for patients. A MEMS acceleration sensor 3 is installed at each of the four corners at the bottom of the main frame. The MEMS acceleration sensor 3 can collect the acceleration of each corner in the three coordinate axis directions and the angular velocity data around each axis in real time with extremely high accuracy. For example, during the acceleration stage of the aircraft takeoff, the MEMS sensor can quickly capture the posture change data of the stretcher main frame 1 caused by acceleration, and transmit these data to the control module at a frequency of 100 times per second through the built-in high-speed data transmission line. At the four corners of the upper surface of the stretcher main frame 1, a medical silicone airbag 5 is carefully designed and installed. For example, each airbag 5 is placed in an airbag groove 4 dug downward, the depth of the airbag groove 4 is 50mm, the diameter is 150mm, and the groove wall is composed of an outer carbon fiber matrix and an inner PTFE lining, which not only ensures the structural strength, but also effectively reduces the friction coefficient between the airbag 5 and the groove wall. The groove wall is inclined at 8 degrees, which helps to guide the airflow during the inflation and deflation of the airbag 5 and improve the response speed. The airbag 5 is connected to the high-pressure gas cylinder integrated in the stretcher main frame 1 through an air path, and a solenoid valve is provided on each air path to control the circulation of the gas. At the same time, a pressure sensor is also built into each airbag 5, and the pressure sensor and the solenoid valve are both connected to the control module to establish a communication connection, so that the control module can obtain the pressure data in the airbag 5 in real time, and accurately control the opening and closing of the solenoid valve according to the demand, so as to achieve accurate regulation of the pressure of the airbag 5. Exemplarily, three shock-absorbing spring assemblies are respectively arranged on both sides of the stretcher main frame 1, and each shock-absorbing spring assembly includes a spring compartment 7, a spring 8 and an elastic retaining ring. Three spring compartments 7 are arranged on each side, and the depth of the spring compartment 7 is 80 mm and the inner diameter is 50 mm. An annular groove is processed on the inner wall of each spring compartment 7, and the spring 8 is placed in the spring compartment 7 and pre-compressed by a compression tool, and then an elastic retaining ring is expanded and embedded in the annular groove, and the spring 8 is released to rebound to the pre-compressed state, and the elastic retaining ring is used to limit the spring 8, and the spring 8 is pre-compressed and installed. Such a design enables the shock-absorbing spring assembly to effectively absorb and disperse the impact force from all directions during the turbulence of the flight, and provide stable support for the patient. The stretcher support plate 2 is located above the stretcher main frame 1, and is fixedly connected to the airbag 5 and the shock-absorbing spring assembly of the buffer device through a high-strength connecting component.The support plate is made of lightweight aluminum alloy, and the surface is covered with a layer of soft medical-grade sponge pad with a thickness of 30mm. The surface of the sponge pad is covered with a layer of breathable, waterproof and antibacterial medical fabric. The support plate is 1900mm long and 750mm wide, which is slightly smaller than the main frame. It can not only ensure that the patient has enough space to move on it, but also ensure that the patient will not be injured due to the displacement of the support plate during the turbulence. The aviation docking module integrates the oxygen supply interface, the negative pressure suction interface and the data port, which are distributed longitudinally on the upper surface of the stretcher main frame 1. The oxygen supply interface adopts an international standard quick-plug interface, which can be quickly connected to the oxygen supply system on the aircraft to ensure that the patient can continue to obtain a stable oxygen supply during the flight. The negative pressure suction interface is also designed in accordance with medical industry standards and can be seamlessly connected to the negative pressure suction equipment on the aircraft to clear secretions in the patient's respiratory tract. The data port supports multiple data transmission protocols, such as RS-232, USB, etc., and can interact with medical monitoring equipment inside the aircraft and the onboard medical main control terminal to achieve real-time transmission and sharing of patient vital signs data.

[0028] Therefore, by collecting data in real time through the MEMS acceleration sensor 3 and accurately adjusting the pressure of the airbag 5 by the control module, it can ensure that the stretcher support plate 2 always remains horizontal during the flight, effectively preventing the patient from feeling uncomfortable or injured due to the tilt of the stretcher, and greatly improving the safety of the patient during transportation. The airbag 5 and the shock-absorbing spring assembly in the buffer device cooperate with each other, and both vertical bumps and horizontal shakes can be effectively buffered, providing a comfortable transportation environment for the patient and reducing the risk of secondary injury to the patient's body caused by bumps.

[0029] In one specific embodiment, it also includes a life support module, which is integrated on the side wall of the end of the stretcher main frame close to the head. The life support module includes a monitoring device, a defibrillator and a simple respirator. The monitoring device is used to monitor the electrocardiogram, blood pressure, blood oxygen saturation and respiratory rate. The monitoring device has a built-in power management system, which displays the power in real time and triggers an alarm when it is lower than a threshold (such as 10%): wherein the monitoring device and the airborne medical main control terminal simultaneously adopt wired and wireless dual-channel modes.

[0030] In the above implementation, the monitoring equipment can simultaneously monitor the key vital signs such as ECG, blood pressure, blood oxygen saturation and respiratory rate in real time. This enables medical staff to keep track of the dynamic changes in the patient's body functions during air transportation. For example, if the patient's ECG fluctuates abnormally, medical staff can quickly judge the condition based on the monitoring data and take corresponding treatment measures in time, which greatly improves the response speed to the patient's condition changes and saves precious time for saving the patient's life. The use of wired and wireless dual-channel modes to transmit data with the onboard medical main control terminal significantly enhances the reliability of data transmission. In a complex flight environment, there may be problems such as signal interference that affect wireless transmission. At this time, the wired transmission channel can be used as a backup to ensure that the patient's vital signs data can be transmitted to the main control terminal uninterruptedly. On the contrary, if the wired connection fails, such as accidental damage to the cable, the wireless channel can continue to ensure data transmission, so that the onboard medical team and the ground medical command center can always obtain accurate and timely patient information, which is convenient for accurate remote medical guidance and decision-making. The built-in power management system uses a high-capacity lithium battery with a capacity of 500Wh and a battery life of 4-6 hours. On the one hand, the high-capacity lithium battery can provide a long-lasting and stable power supply for the monitoring equipment to meet the power supply needs of the equipment during long-term air transportation. On the other hand, the power management system displays the power in real time and triggers an alarm when the power is lower than the threshold (10%). This function allows medical staff to know the power status of the equipment in advance. If the power is insufficient, the backup power supply can be switched in time to avoid monitoring interruption due to power failure of the equipment, ensuring uninterrupted monitoring of the patient's vital signs throughout the process, and providing power protection for the patient's life safety. As important components of the life support module, the defibrillator and the simple respirator play a key role in emergency situations. When the patient has a life-threatening emergency such as cardiac arrest, the defibrillator can quickly implement electric shock defibrillation to help the patient restore normal heart rhythm. The simple respirator can provide the patient with necessary respiratory support and maintain the patient's vital signs when the patient's respiratory function is impaired.

[0031] In one specific embodiment, an airbag 5 is respectively arranged at the four corner positions of the upper surface of the stretcher main frame 1, specifically: an airbag groove 4 is dug downward at the four corner positions of the upper surface of the stretcher main frame 1, and each of the airbags 5 is arranged in an airbag groove 4; a high-pressure gas cylinder is integrated inside the stretcher main frame 1, and each of the airbags 5 is connected to the high-pressure gas cylinder through an air path; a solenoid valve is arranged on each air path, wherein a pressure sensor is arranged inside each airbag 5, and the pressure sensor and the solenoid valve are both communicated with the control module, and the side wall of the airbag groove 4 is inclined at 5-10 degrees, wherein the gas in the airbag and the high-pressure gas cylinder is nitrogen.

[0032] Specifically, the control module generates an airbag pressure adjustment instruction to adjust the airbag pressure of the four airbags 5, specifically: A data processing module, which is used to receive in real time the posture data, environmental data and pressure feedback data collected by the four MEMS acceleration sensors 3 and perform pre-processing; A flight phase identification module, which is connected to the data processing module and determines the current flight phase according to the data preprocessed by the data processing module, wherein the flight phase includes: take-off / landing phase, turbulence phase and cruise phase, wherein each phase corresponds to a different PID parameter preset; Decoupling control calculation module, which converts the attitude angle into the target pressure through a 4×4 coupling matrix and performs dynamic coupling update. When the pressure change rate of one of the airbags 5 is greater than 20kPa / s, the self-coupling coefficient is reduced by 2% and the cross-coupling coefficient is increased by 2%; An adaptive PID control module, which independently performs error calculation, PID term calculation and output pressure command for each airbag 5; The pressure-PWM conversion module is used to convert the output pressure command into a solenoid valve control signal.

[0033] In the above embodiment, airbag grooves 4 are dug at the four corners of the upper surface of the stretcher main frame 1 to place the airbag 5, and the side walls of the airbag grooves 4 are inclined at 5-10 degrees. This design not only ensures the stability of the installation of the airbag 5, but also saves space to a certain extent, making the overall structure of the stretcher more compact and reasonable. At the same time, the inclined side walls help to guide the airbag 5 to deform better during the inflation and deflation process of the airbag 5, thereby improving the reliability of the airbag 5. The high-pressure gas cylinder is integrated inside the stretcher main frame 1, reducing the mounting of external equipment, making the stretcher simple in appearance, reducing the risk of collision damage caused by external protruding equipment during transportation, and improving the overall safety and portability of the stretcher. The gas in the airbag and the high-pressure gas cylinder is nitrogen. Nitrogen is not easy to react chemically with other substances (such as medical silicone airbag materials and the inner wall of metal gas cylinders), avoiding problems such as airbag aging and gas cylinder leakage caused by oxidation or corrosion, and extending the service life of the equipment. There may be a high-concentration oxygen environment in the cabin (such as in emergency treatment). The non-flammable nature of nitrogen can eliminate the risk of accidental ignition of the airbag or gas path due to static electricity, friction, etc., which meets aviation safety standards. Nitrogen has a low thermal expansion coefficient. When experiencing changes in air pressure and temperature during flight (such as low temperature at high altitude and temperature difference during takeoff / landing), the airbag pressure fluctuates less, reducing the adjustment frequency of the control module and improving system stability. High-pressure gas cylinders can use 20MPa (200 bar) medical high-pressure gas cylinders (in compliance with aviation safety standards). 1L (1000cm³) high-pressure gas cylinders can be used. If the flight time is expected to be longer or the turbulence is more severe, a dual gas cylinder design or a higher pressure (300bar) gas cylinder can be used. When implementing it, flight simulation tests are required to verify the actual gas consumption under different turbulence intensities and optimize the selection of gas cylinders. It should be noted that the airbag pressure adjustment limit values ​​are: minimum pressure ≥30kPa, to ensure that the airbag can still maintain basic support when not loaded, to avoid complete pressure relief and stretcher collapse; maximum pressure ≤150kPa, to prevent overpressure of the airbag from causing material fatigue, air leakage or affecting the shock absorption effect; safety thresholds in extreme cases: instantaneous impact pressure ≤200kPa, the aircraft encounters strong turbulence (such as 2G acceleration), the system allows overpressure for a short time, but it must return to the normal range within 0.5 seconds; emergency pressure relief threshold ≥250kPa, if the pressure sensor detects abnormally high pressure (such as air path blockage or control failure), the pressure relief valve is automatically triggered to prevent the airbag from rupturing.

[0034] The control module generates airbag pressure adjustment instructions to adjust the airbag pressure of the four airbags 5. The specific implementation process is as follows: attitude data includes: roll angle (roll), pitch angle (pitch), accuracy ±0.1°; environmental data includes: altitude (altitude), vibration intensity (vibration); pressure feedback: current pressure value (kPa) of the four airbags 5 (obtained through pressure sensors). Preprocess the collected data: low-pass filter (cut-off frequency 5Hz) for the angle data to eliminate high-frequency noise; calculate the RMS value (root mean square value) of the vibration signal for subsequent working condition judgment in order to identify the dynamic environmental state of the aircraft. The mechanical disturbance intensity of different flight stages is distinguished by RMS value, and two types of flight stages are mainly identified: a. Turbulence stage (high vibration), the judgment condition is that the vibration RMS value>0.5g (g refers to the standard gravity acceleration, an exemplary threshold value, which can be calibrated according to actual conditions), and the control response is: increase the PID proportional coefficient (Kp increases by 30%-50%); appropriately reduce the integral time (Ti) to avoid over-adjustment; increase the differential weight (Td) to improve the damping effect. b. Stable stage (low vibration), judgment condition: vibration RMS value ≤0.5g, control response: use standard PID parameters to maintain stable regulation; reduce control energy consumption and extend the life of pneumatic components. Therefore, according to the data pre-processed by the data processing module, the flight stages are divided into: take-off / landing stage: altitude <100 meters; turbulence stage: vibration RMS value>0.5g, and altitude>100 meters; cruise stage: other situations. Each stage corresponds to a different PID parameter preset. For example, in the cruise stage: the proportional coefficient Kp is 1.0; the integral time Ti (s) is 0.5; the differential time Td (s) is 0.1; take-off / landing: the proportional coefficient Kp is 1.2; the integral time Ti (s) is 0.3; the differential time Td (s) is 0.2; turbulence: the proportional coefficient Kp is 1.4; the integral time Ti (s) is 0.4; the differential time Td (s) is 0.15. The decoupling control calculation module is specifically as follows: Step 1, target pressure generation: The attitude angle is converted into the target pressure F through the 4×4 coupling matrix, and the calculation formula is: , where M is the coupling matrix. Step 2, dynamic coupling update: When the pressure change rate of a certain airbag 5 is >20kPa / s: the self-coupling coefficient (diagonal elements) is reduced by 2%, and the cross-coupling coefficient (non-diagonal) is increased by 2%. The adaptive PID control module is specifically: the following calculations are performed independently for each airbag 5: a. The error w is calculated as: w=F-current pressure; b. PID term calculation, proportional term P: directly amplify the error P=Kp×w; integral term I: accumulated error ; Differential term D: Differential after filtering D = Kp × Td × (error change rate after filtering); c. Output pressure command = P + I + D. Convert PID output to solenoid valve control signal: PWM duty cycle = 10% + (pressure command - 80kPa) × (90% - 10%) / (150kPa - 80kPa), output limit: 10% - 90% duty cycle; corresponding pressure range: 80-150kPa. This design achieves fast and accurate independent regulation of the four airbags 5 through dynamic parameter adjustment and decoupling control. For a specific example, when the aircraft encounters turbulence and causes the left side to lift, the left MEMS sensor detects an increase in pitch angle (such as + 2°); after the control module solves, it instructs the left airbag 5 to release pressure and the right airbag 5 to increase pressure; after the pressure is adjusted, the MEMS acceleration sensor 3 feedback attitude angle returns to 0° ± threshold (the threshold can be specifically limited according to needs), and it is determined to be horizontal. Specifically, the solenoid valve can be a two-position three-way solenoid valve. When powered on, the high-pressure gas cylinder is connected to the airbag 5 to inflate and pressurize. When powered off, the gas source is cut off and the gas is exhausted (through the exhaust port of the three-way valve) to achieve pressure reduction. The solenoid valve can be Festo MHJ9, with a response time (power on-fully open): ≤ 5 ms (milliseconds; closing time (power off→fully closed): ≤ 10 ms; life: ≥ 10 million switching cycles.

[0035] In one specific embodiment, the groove wall of the airbag groove 4 is composed of a carbon fiber matrix and a PTFE lining, an annular groove is prefabricated on the periphery of the airbag 5, and a pneumatic lip sealing ring 6 is arranged in the annular groove, with the lip facing the inner wall of the airbag groove 4.

[0036] In the above embodiment, the groove wall of the airbag groove 4 is composed of a carbon fiber matrix and a PTFE liner. The carbon fiber matrix has the characteristics of high strength and low density, which can effectively enhance the structural strength of the airbag groove 4, making it not easy to be damaged when it is subjected to the pressure of the airbag 5 and possible external impact, greatly improving the durability of the airbag groove 4. The PTFE liner (polytetrafluoroethylene liner) has an extremely low friction coefficient. During the inflation and deflation of the airbag 5, it can reduce the friction between the airbag 5 and the wall of the airbag groove 4, reduce the wear of the airbag 5, and extend the service life of the airbag 5. At the same time, it also helps the airbag 5 to inflate and deflate more smoothly, further improving the reliability of the airbag 5. An annular groove is prefabricated on the periphery of the airbag 5 and a pneumatic lip seal ring 6 is set, with the lip facing the inner wall of the airbag groove 4. This design provides a good sealing effect. When the airbag 5 is inflated, the internal pressure increases, and the pneumatic lip seal 6 is tightly attached to the inner wall of the airbag groove 4 under the pressure, effectively preventing gas from leaking from the gap between the airbag 5 and the wall of the airbag groove 4, ensuring that the airbag 5 can maintain a stable pressure and provide continuous and stable support for the person on the stretcher. At the same time, this sealing structure can also prevent external dust, impurities, etc. from entering the gap between the airbag 5 and the wall of the airbag groove 4, avoiding the impurities from wearing the airbag 5 or affecting the normal operation of the airbag 5.

[0037] In one specific embodiment, a plurality of shock-absorbing spring assemblies are respectively arranged on both sides of the stretcher main frame 1, specifically: Two or three spring compartments 7 are respectively arranged on both sides of the stretcher main frame 1, and an annular groove is arranged on the inner wall of each spring compartment 7. A spring 8 is placed in the spring compartment 7 and the spring 8 is compressed, and an elastic retaining ring is expanded and embedded in the annular groove, and the spring 8 is released to make it rebound to the pre-compressed state, and the elastic retaining ring is used for limiting.

[0038] In the above embodiment, the elastic retaining ring can adopt DIN 471 retaining ring. Use a press tool to compress the spring 8 to 50mm, expand the retaining ring and insert it into the annular retaining groove of the spring compartment 7, release the press force, and the spring 8 rebounds to the pre-compressed state, which is limited by the annular retaining ring. A plurality of shock-absorbing spring assemblies are arranged on both sides of the stretcher main frame 1, which can play a significant buffering role against the vibration from the ground or the transportation tool during the transportation process. When the stretcher is bumped, the elastic deformation of the spring 8 can absorb the vibration energy, reduce the vibration transmitted to the body of the injured on the stretcher, and reduce the discomfort caused by the vibration of the injured, especially for patients with fragile bodies or injuries, which greatly improves the comfort and safety during the transportation process. Multiple springs 8 are distributed on both sides to cope with vibrations of different directions and intensities. In the air turbulence that may be encountered during the flight, these springs 8 can work together to buffer the vibration from all angles, ensuring that the stretcher can remain relatively stable in complex environments and provide more reliable protection for the injured. By providing an annular groove on the inner wall of the spring compartment 7 and using an elastic retaining ring to limit the pre-compressed spring 8, this design ensures the stability of the spring 8 during use. The spring 8 will not be displaced or fall off at will, and can always stay in the correct position to play a shock-absorbing role even under long-term and frequent vibration impacts, thereby enhancing the reliability of the connection between the entire shock-absorbing system and the stretcher main frame 1, thereby improving the stability of the overall structure of the stretcher.

[0039] In one specific embodiment, an expansion wing 10 is respectively provided on both sides of the stretcher main frame 1, and the expansion wing 10 is made of carbon fiber honeycomb sandwich panel; the expansion wing 10 is connected to the side of the stretcher main frame 1 through a titanium alloy hinge 13, and a self-locking gas pressure rod 12 is provided below the expansion wing 10, one end of the self-locking gas pressure rod 12 is rotatably connected to the lower surface of the expansion wing 10, and the other end is rotatably connected to the side wall of the stretcher main frame 1, wherein an environmentally adaptive shadowless lamp is provided on the side of the upper surface of the stretcher main frame 1, and an elastic card slot 11 is provided on the edge of the expansion wing, which can be compatible with a standard surgical instrument tray; a surgical chair is also provided on the side of the stretcher main frame 1, wherein the surface of the expansion wing 10 and the surface of the titanium alloy hinge 13 are covered with an antibacterial coating.

[0040] In the above embodiment, an expansion wing 10 is respectively provided on both sides of the stretcher main frame 1, and the material thereof is a carbon fiber honeycomb sandwich plate. This material has the remarkable characteristics of high strength and low density, which not only ensures that the expansion wing 10 has sufficient structural strength to carry items of a certain weight or withstand external pressure, but also does not bring too much burden to the stretcher as a whole due to its own excessive weight, affecting the convenience of carrying. The expansion wing is connected to the side of the stretcher main frame 1 through a titanium alloy hinge. The titanium alloy hinge has good corrosion resistance, high strength and excellent flexibility. The corrosion resistance can ensure long-term stable operation in various complex environments and is not easy to rust and damage. The width of the expansion wing 10 is set to 15~20cm. A self-locking gas pressure rod 12 is set below the expansion wing 10, and the self-locking gas pressure rod 12 can adopt the existing technology. One end of the self-locking gas pressure rod 12 is firmly connected to the lower surface of the expansion wing through a rotating connector, and the other end is also connected to the side wall of the stretcher main frame 1 in a rotating connection. The self-locking gas pressure rod 12 has an automatic locking function. When the expansion wing is unfolded to a suitable angle, the self-locking gas pressure rod 12 will automatically lock, providing reliable support for the expansion wing to prevent it from accidentally shaking or folding; when the expansion wing 10 needs to be folded, only the unlocking device needs to be operated, and the self-locking gas pressure rod 12 can be restored to a retractable state, which is convenient and quick. An environmental adaptive shadowless lamp is set on the side of the upper surface of the stretcher main frame 1, and the existing technology can be used. The shadowless lamp is equipped with an advanced light sensing and adjustment system, which can automatically adjust its own luminous brightness and color temperature according to the intensity and color of the surrounding light, ensuring that it can provide uniform, shadowless and sufficient lighting for the surgical or inspection area in various environments, avoiding the impact of light problems on medical operations. The elastic card slot 11 is carefully designed on the edge of the expansion wing 10, so that it can be perfectly compatible with the standard surgical instrument tray. The elastic card slot 11 has a certain elastic deformation ability, which can tightly clamp the surgical instrument tray to prevent the tray from shaking or falling during transportation or use, and at the same time facilitate medical staff to quickly load and unload the tray. It can be equipped with a special operating chair. The height, angle and other parameters of the operating chair can be flexibly adjusted according to actual needs, providing medical staff with a comfortable sitting posture during surgery, reducing fatigue caused by standing for long periods of time or uncomfortable postures, and improving the accuracy and efficiency of surgical operations.

[0041] In one specific embodiment, the stretcher main frame 1 is fixedly connected to the cabin floor through a rotary quick-release lock 9. The bottom of the rotary quick-release lock 9 protrudes downward from the stretcher main frame by 150 mm and is directly engaged with the cabin floor anchor point. A 5-10 mm gap is retained between the bottom of the stretcher main frame 1 and the cabin floor. Polyurethane foot pads are arranged at the four corners of the bottom of the stretcher main frame 1 to provide temporary support when the rotary quick-release lock 9 is not engaged with the cabin floor anchor point.

[0042] In the above embodiment, the rotary quick-release lock 9 greatly improves the efficiency of fixing and removing the stretcher from the cabin floor. After the medical staff carries the stretcher to the cabin, there is no need for a complicated installation process. They only need to align the bottom of the lock with the cabin floor anchor point and rotate the lock to complete a firm connection. Similarly, when the stretcher needs to be quickly transferred at the destination, it can be quickly unlocked through a simple rotation operation to achieve rapid disassembly of the stretcher, meeting the timeliness requirements of emergency medical tasks. The rotary quick-release lock can use existing technology.

[0043] In one specific embodiment, the stretcher main frame 1 includes: a main frame and a U-shaped frame arranged at both ends of the main frame, and the U-shaped frame is slidably connected to the main frame through a guide rail. Specifically, guide rails are arranged inside the two side edges of the stretcher main frame 1, and sliders corresponding to the guide rails are arranged on the U-shaped frame. Magnetic stainless steel strips are pre-embedded on the inner side of the guide rails, and an electromagnet is integrated on the slider of the U-shaped frame to facilitate locking the guide rails and the slider.

[0044] In the above embodiment, the U-shaped frame is slidably connected to the main frame by a guide rail, thereby realizing the adjustability of the stretcher main frame 1. In the actual medical transportation process, facing patients of different heights, medical staff can easily adjust the overall length of the stretcher according to the specific body size of the patient by sliding the U-shaped frame. Compared with the traditional stretcher with a fixed length, this adjustable design greatly improves the versatility of the stretcher, ensuring that no matter how tall or short the patient is, he or she can lie comfortably on the stretcher. The stretcher support plate 2 is also configured to be adjustable. A removable cushion is provided at the end of the stretcher support plate 2.

[0045] In summary, this multifunctional transport equipment can not only ensure that the stretcher supporting plate 2 is always in a horizontal position and effectively cope with the turbulence during flight, but also effectively reduce the vibration damage to the patient's body caused by flight turbulence, provide good protection for the patient's body, and monitor important vital signs, thereby comprehensively improving the safety, comfort and convenience of patient transportation during air medical rescue.

[0046] The number of devices and processing scales described here are used to simplify the description of the present invention. Applications, modifications and variations of the present invention will be obvious to those skilled in the art.

[0047] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. Multifunctional handling equipment for air transport of medical evacuations, characterized in that: include: The stretcher main frame has a MEMS acceleration sensor installed at each of the four corners at the bottom to collect the acceleration and angular velocity data of each corner in real time and transmit the collected data to the control module; A buffer device, comprising an air bag and a shock absorbing spring assembly, wherein an air bag is respectively arranged at four corner positions of the upper surface of the stretcher main frame, and a plurality of shock absorbing spring assemblies are respectively arranged at two side positions of the stretcher main frame; wherein each air bag is connected to the control module; A stretcher supporting plate, which is arranged above the stretcher main frame and fixedly connected to the buffer device; An aviation docking module, which includes an oxygen supply interface, a negative pressure suction interface and a data port, and is longitudinally distributed on the upper surface of the stretcher main frame; The control module generates an airbag pressure adjustment instruction according to the data collected by the four MEMS acceleration sensors, and adjusts the airbag pressures of the four airbags respectively, so that the stretcher support plate is in a horizontal position.

2. The multifunctional transport equipment for air transport of medical evacuation according to claim 1, characterized in that: It also includes a life support module, which is integrated on the side wall of the end of the stretcher main frame close to the head. The life support module includes monitoring equipment, a defibrillator and a simple respirator. The monitoring equipment is used to monitor electrocardiogram, blood pressure, blood oxygen saturation and respiratory rate. The monitoring equipment has a built-in power management system, which displays the power in real time and triggers an alarm when it is lower than the threshold: wherein the monitoring equipment and the airborne medical main control terminal adopt both wired and wireless dual-channel modes.

3. The multifunctional transport equipment for air transport of medical evacuation according to claim 1, characterized in that: An airbag is respectively arranged at the four corner positions of the upper surface of the stretcher main frame, specifically: an airbag groove is dug downward at the four corner positions of the upper surface of the stretcher main frame, and each airbag is arranged in one of the airbag grooves; a high-pressure gas cylinder is integrated inside the stretcher main frame, and each airbag is connected to the high-pressure gas cylinder through an air path; a solenoid valve is arranged on each air path, wherein a pressure sensor is arranged inside each airbag, and the pressure sensor and the solenoid valve are both communicated with the control module, and the side wall of the airbag groove is inclined at 5-10 degrees, wherein the gas in the airbag and the high-pressure gas cylinder is nitrogen.

4. The multifunctional transport equipment for air transport of medical evacuation according to claim 3, characterized in that: The control module generates an airbag pressure adjustment instruction to adjust the airbag pressure of the four airbags, specifically: A data processing module, which is used to receive the attitude data, environmental data and pressure feedback data collected by four MEMS acceleration sensors in real time and perform pre-processing; A flight phase identification module, which is connected to the data processing module and determines the current flight phase according to the data preprocessed by the data processing module, wherein the flight phase includes: take-off / landing phase, turbulence phase and cruise phase, wherein each phase corresponds to a different PID parameter preset; Decoupling control calculation module, which converts the attitude angle into the target pressure through a 4×4 coupling matrix and performs dynamic coupling update. When the pressure change rate of one of the airbags is greater than 20kPa / s, the self-coupling coefficient is reduced by 2% and the cross-coupling coefficient is increased by 2%; Adaptive PID control module, which performs error calculation, PID term calculation and output pressure command for each airbag independently; The pressure-PWM conversion module is used to convert the output pressure command into a solenoid valve control signal.

5. The multifunctional transport equipment for air transport of medical evacuation according to claim 3, characterized in that: The groove wall of the airbag groove is composed of a carbon fiber matrix and a PTFE lining. An annular embedding groove is prefabricated on the periphery of the airbag. A pneumatic lip sealing ring is arranged in the annular embedding groove, and the lip faces the inner wall of the airbag groove.

6. The multifunctional transport equipment for air transport of medical evacuation according to claim 3, characterized in that: A plurality of shock-absorbing spring assemblies are respectively arranged on both sides of the stretcher main frame, specifically: Two or three spring compartments are respectively arranged on both sides of the stretcher main frame, and an annular groove is arranged on the inner wall of each spring compartment. A spring is placed in the spring compartment and compressed, and an elastic retaining ring is expanded and embedded in the annular groove. The spring is released to make it rebound to a pre-compressed state and is limited by the elastic retaining ring.

7. The multifunctional transport equipment for air transport of medical evacuation according to claim 1, characterized in that: An expansion wing is respectively arranged on both side edges of the stretcher main frame, and the expansion wing is made of carbon fiber honeycomb sandwich panels; the expansion wing is connected to the side of the stretcher main frame through a titanium alloy hinge, and a self-locking gas pressure rod is arranged below the expansion wing, one end of the self-locking gas pressure rod is rotatably connected to the lower surface of the expansion wing, and the other end is rotatably connected to the side wall of the stretcher main frame, wherein an environmentally adaptive shadowless lamp is arranged on the side of the upper surface of the stretcher main frame, and an elastic card slot is arranged on the edge of the expansion wing, which can be compatible with a standard surgical instrument tray; a surgical chair is also provided on the side of the stretcher main frame, wherein the surface of the expansion wing and the surface of the titanium alloy hinge are covered with an antibacterial coating.

8. The multifunctional transport equipment for air transport medical evacuation according to claim 1, characterized in that: The stretcher main frame is fixedly connected to the cabin floor through a rotary quick-release lock. The bottom of the rotary quick-release lock protrudes downward from the stretcher main frame by 50 mm and is directly engaged with the cabin floor anchor point. A 5-10 mm gap is retained between the bottom of the stretcher main frame and the cabin floor. Polyurethane foot pads are arranged at the four corners of the bottom of the stretcher main frame to provide temporary support when the rotary quick-release lock is not engaged with the cabin floor anchor point.

9. The multifunctional transport device for air transport of medical evacuation according to claim 1, characterized in that: The stretcher main frame includes: a main frame and U-shaped frames arranged at both ends of the main frame, and the U-shaped frame is slidably connected to the main frame through guide rails. Specifically, guide rails are arranged inside the two sides of the stretcher main frame, and sliders corresponding to the guide rails are arranged on the U-shaped frame. Magnetic stainless steel strips are pre-embedded inside the guide rails, and an electromagnet is integrated on the slider of the U-shaped frame to facilitate locking of the guide rails and the slider.

10. The multifunctional transport device for air transport of medical evacuation according to claim 9, characterized in that: The stretcher main frame is made of carbon fiber composite material, a detachable soft pad is arranged at the end of the stretcher support plate, and the airbag is made of medical silica gel airbag.

Images