Life support stretcher

Abstract

The invention provides a life support stretcher. The life support stretcher is internally provided with a controller and an air bag pressurization binding belt used for binding the wounded, wherein a vital sign data detection unit is arranged in the air bag pressurization binding belt; the life promotion data specifically comprises heart rate, breathing parameters, blood pressure, body temperature and oxyhemoglobin saturation; the controller is used for controlling the air pressure in the air bag pressurization binding belt according to the vital sign data, detected by the vital sign data detection unit, of the wounded, and dynamically adjusting the binding tightness degree through a multi-modal data fusion algorithm and wound part recognition. Thus, when the life support stretcher is used for transferring a wounded person, the air bag pressurization binding belt can be used for binding the wounded person, the vital sign data of the wounded person can be detected through the vital sign data detection unit in the air bag pressurization binding belt, and then the controller can control the wounded person according to the detected vital sign data. And the air pressure in the air bag pressurizing binding belt is controlled, so that the trauma to the wounded caused by bumping is reduced.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and more specifically, to a life support stretcher. Background Technology

[0002] Life support stretchers can be used to transport wounded soldiers, but during the transport process, the jolting motion often causes secondary trauma to the patients. Therefore, how to prevent injury to the patients on the life support stretcher due to jolting motion is the technical problem that this application aims to solve. Summary of the Invention

[0003] The purpose of this application is to provide a life support stretcher to solve the problems in the prior art.

[0004] This application provides a life support stretcher, which includes a controller and an airbag pressure strap for binding the injured person. The airbag pressure strap includes a vital sign data detection unit for detecting the injured person's vital signs. The vital signs data specifically include any one or more of the following: heart rate, respiratory parameters, blood pressure, body temperature, and blood oxygen saturation. The controller controls the air pressure in the airbag pressure strap based on the vital sign data detected by the vital sign data detection unit. The air pressure in the airbag pressure strap reflects the tightness of the airbag pressure strap binding the injured person.

[0005] Furthermore, based on the vital signs data of the injured person detected by the vital signs data detection unit, the air pressure in the airbag pressurization strap is controlled, specifically including: determining the target air pressure of the airbag pressurization strap based on the vital signs data of the injured person detected by the vital signs data detection unit; and adjusting the airbag pressurization strap from the current air pressure to the target air pressure according to the preset pressure increase and decrease rules.

[0006] Furthermore, based on the vital signs data of the injured person detected by the vital signs data detection unit, the target air pressure of the airbag compression strap is determined. Specifically, this involves substituting the injured person's vital signs data into the target air pressure calculation formula shown below to calculate the target air pressure: in, This is a correction factor for the location of the injury.

[0007] Furthermore, according to the preset pressure increase and decrease rules, the airbag pressurization strap is adjusted from the current air pressure to the target air pressure. Specifically, this includes: determining the air pressure adjustment amount based on the target air pressure and the current air pressure; dividing the air pressure adjustment amount into multiple intervals, and for each interval, using the corresponding pressure increase and decrease rate to adjust the airbag pressurization strap from the current air pressure to the target air pressure.

[0008] Furthermore, the pressure adjustment amount is divided into multiple intervals, and for each interval, a corresponding rate of pressure increase or decrease is applied. Specifically, the pressure adjustment amount is divided into three intervals: the first interval is the first 30% of the pressure adjustment amount, the third interval is the last 30% of the pressure adjustment amount, and the second interval is the middle 40% of the pressure adjustment amount. In the first interval, a first rate of pressure increase or decrease is applied; in the second interval, a second rate of pressure increase or decrease is applied; and in the third interval, a third rate of pressure increase or decrease is applied. The second rate of pressure increase or decrease is greater than the third rate of pressure increase or decrease, and the third rate of pressure increase or decrease is greater than or equal to the first rate of pressure increase or decrease. The first, second, and third rates of pressure increase or decrease are all adjusted according to the type of injury.

[0009] Furthermore, the life support stretcher includes a stretcher body; and the stretcher body is provided with multiple airbag pressure straps.

[0010] Furthermore, the stretcher body is equipped with three airbag pressure binding straps, which are used to bind the upper torso, waist and legs of the wounded, respectively; and each airbag pressure binding strap has a pressure distribution sensor array on its inner side.

[0011] Furthermore, the life support stretcher is also equipped with an airbag tourniquet and multiple ultrasonic ranging sensors. The airbag tourniquet includes an upper limb airbag tourniquet and a lower limb airbag tourniquet. The upper limb airbag tourniquet has a first air passage, and the lower limb airbag tourniquet has a second air passage. The controller is connected to the first air passage, the second air passage, and the ultrasonic ranging sensors. The ultrasonic ranging sensors are used to measure the circumference of the upper limb and the lower limb and transmit the data to the controller. The controller is also used to receive the upper limb circumference value and adjust the inflation volume in the first air passage, and to receive the lower limb circumference value and adjust the inflation volume in the second air passage.

[0012] Furthermore, the controller determines the target air pressure in the airbag tourniquet in the following manner: Where A is the target air pressure in the airbag tourniquet; K is a preset constant; B is the influence of the patient's blood pressure on the target air pressure; C is the influence of the patient's age on the target air pressure; and D is the influence of the patient's gender on the target air pressure.

[0013] Furthermore, the airbag tourniquet has a built-in memory metal support frame that automatically expands when the air pressure drops suddenly.

[0014] The life support stretcher provided in this application embodiment includes a controller and an airbag pressure bandage for binding the wounded. The airbag pressure bandage includes a vital sign data detection unit for detecting the wounded's vital signs. The controller controls the air pressure in the airbag pressure bandage based on the vital sign data detected by the vital sign data detection unit. The magnitude of the air pressure in the airbag pressure bandage reflects the tightness of the airbag pressure bandage binding the wounded. In this way, when using this life support stretcher to transport the wounded, the wounded can be bound with an airbag-inflated strap, and the vital signs data detection unit in the airbag-inflated strap can detect the wounded's vital signs data. The controller can then control the air pressure in the airbag-inflated strap based on the detected vital signs data, thereby adjusting the tightness of the airbag-inflated strap on the wounded. This airbag-inflated strap binding of the wounded reduces the trauma caused by bumps and solves the problems in the prior art. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A schematic diagram of the specific structure of a life support stretcher provided in one embodiment of this application; Figure 2 A schematic diagram of the specific structure of a vital signs data detection unit provided in an embodiment of this application; Figure 3 This is a cross-sectional view of an airbag compression strap provided in an embodiment of this application; Figure 4 A schematic diagram of the structure of a life support stretcher provided in another embodiment of this application; Figure 5 A schematic diagram of the structure of a depth camera for a life support stretcher provided in an embodiment of this application; Figure 6 This is a top view of an airbag compression strap provided in an embodiment of this application; Figure 7 This is a schematic diagram of the structure of an airbag pressure strap provided in an embodiment of this application; Figure 8 A top view of a life support stretcher provided in an embodiment of this application; Figure 9 A flowchart illustrating the operation of a life support stretcher provided in one embodiment of this application.

[0017] Figure label: Controller 1; Camera 11; Touch screen 12; Card reader 13; Depth camera 14; Airbag pressure strap 2; Skin-friendly layer 21; Stress-bearing layer 22; Memory metal support frame 24; Airbag 23; Stretcher body 3; Vital signs data detection unit 25; Ultrasonic ranging sensor 4; Weighing sensor 5; Air pressure locking valve 6; Mechanical locking buckle 7; Pulley 8; Air pump 9. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will now be described with reference to the accompanying drawings. In the description of this application, terms such as "first," "second," and "third" are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance or order.

[0019] As mentioned earlier, during the transfer of wounded patients using life support stretchers, secondary trauma is often caused by the jolting motion. Therefore, how to prevent injury to wounded patients on life support stretchers due to jolting is the technical problem that this application aims to solve.

[0020] In view of this, embodiments of this application provide a life support stretcher. For example... Figure 1 The diagram shows the specific structure of the life support stretcher. The stretcher includes a controller 1 and an airbag pressure restraint strap 2, which can be used to restrain the injured person. For example, before using the life support stretcher to transport the injured person, the airbag pressure restraint strap 2 can be used to restrain the injured person, thereby reducing trauma caused by bumps and jolting.

[0021] It should be further explained that the airbag pressure strap 2 is equipped with a vital sign data detection unit 25 for detecting the vital signs data of the injured person. The vital sign data specifically includes any one or more of the following: heart rate, respiratory parameters, blood pressure, body temperature, and blood oxygen saturation. In this way, the controller 1 can control the air pressure in the airbag pressure strap according to the vital sign data of the injured person detected by the vital sign data detection unit 25.

[0022] The air pressure in the airbag compression strap reflects the tightness of the strap on the injured person. For example, the higher the air pressure in the airbag compression strap, the tighter the strap is on the injured person; conversely, the lower the air pressure, the looser the strap is on the injured person.

[0023] Therefore, the life support stretcher provided in this application embodiment is adopted. The life support stretcher is equipped with a controller 1 and an airbag pressure binding strap 2 for binding the wounded. The airbag pressure binding strap 2 is equipped with a vital sign data detection unit 25 for detecting the vital sign data of the wounded. The controller 1 is used to control the air pressure in the airbag pressure binding strap 2 according to the vital sign data of the wounded detected by the vital sign data detection unit 25. The magnitude of the air pressure in the airbag pressure binding strap 2 reflects the tightness of the airbag pressure binding strap on the wounded. In this way, when using this life support stretcher to transport the wounded, the wounded can be bound with the airbag pressure binding strap 2, and the vital signs data detection unit 25 in the airbag pressure binding strap 2 can detect the wounded's vital signs data. Then, the controller 1 can control the air pressure in the airbag pressure binding strap 2 according to the detected vital signs data, thereby adjusting the tightness of the airbag pressure binding strap 2 on the wounded. In this way, the binding of the wounded with the airbag pressure binding strap 2 reduces the trauma caused to the wounded by bumps, thus solving the problems in the prior art.

[0024] Further integration Figure 1 and Figure 2 As shown, in practical applications, this life support stretcher may include a stretcher body 3, allowing the injured person to be placed on the stretcher body 3 and then secured using an airbag-inflated restraint strap 2. Typically, the airbag-inflated restraint strap 2 is located on the stretcher body 3, for example, on the side edge of the stretcher body 3. When securing the injured person, the airbag-inflated restraint strap 2 is wrapped around the injured person from the side edge and pulled to the other side edge for fixation.

[0025] In practical applications, there can be multiple airbag pressure binding straps 2, so that multiple airbag pressure binding straps 2 can be used to bind the wounded more securely. For example, there can be 2, 3, 4 or other numbers of airbag pressure binding straps 2. These airbag pressure binding straps 2 can all be set in the stretcher body 3, for example, they can all be set on the side edge of the stretcher body 3.

[0026] For example, the number of airbag pressure binding straps 2 can be three. These three airbag pressure binding straps 2 are respectively set at the upper, middle, and lower ends of the stretcher body 3, so as to bind the upper part of the patient's torso (such as the shoulder and chest areas), waist, and legs (usually the lower legs), thereby providing a more stable binding of the patient's body by binding the upper part of the torso, waist, and legs with these three airbag pressure binding straps 2. The vital signs detection unit includes a pressure distribution sensor array. Each airbag pressure binding strap has a pressure distribution sensor array on its inner side, and the resolution of the pressure distribution sensor array is 1. .

[0027] In one embodiment, a pressure distribution sensor array may be embedded inside the airbag compression strap to identify the site of injury in the wounded person.

[0028] In addition, a weighing sensor 5 can be installed in the stretcher body 3 to measure the weight of the injured person.

[0029] Of course, to facilitate the transfer of the injured person on the life support stretcher, pulleys 8 can be installed in the life support stretcher. For example, multiple pulleys 8 can be installed at the bottom of the stretcher body 3, so that the rotation of the pulleys 8 can be used to drive the life support stretcher during the process of pushing it. Of course, for easy steering, the pulleys 8 can be casters or Mecanum wheels.

[0030] It should be noted that when using this life support stretcher to transport the wounded, when determining the air pressure in the airbag compression straps, it is necessary to consider two aspects. First, the stability of the straps on the wounded needs to be considered. The higher the air pressure, the more stable the straps will be. Second, it is also necessary to consider the air pressure in the compression straps that the wounded person's physical condition can withstand. For example, if the wounded person's physical condition is poor, the straps need to be relatively loose.

[0031] Therefore, considering these two factors, the vital signs data detection unit 25 installed in the airbag pressure binding strap 2 is needed to detect the vital signs data of the bound casualty. Specifically, the vital signs data of the casualty—heart rate, respiratory parameters, blood pressure, body temperature, and blood oxygen saturation—can directly reflect the casualty's current physical condition. For example, if heart rate, respiratory parameters, and blood pressure are within the normal range, it indicates that the casualty's current physical condition is good; conversely, if they exceed the normal range, or even far exceed it, it indicates that the casualty's current physical condition is poor. Based on this, in this embodiment, the vital signs data detection unit 25 installed in the airbag pressure binding strap 2 is used to detect the vital signs data of the bound casualty, thereby enabling the controller 1 to control the air pressure in the pressure binding strap based on the vital signs data, thus controlling the tightness of the binding. The respiratory parameters can include respiratory rate and respiratory depth, etc.

[0032] As mentioned above, the controller 1 can control the air pressure in the airbag pressure strap 2 based on the vital signs data of the injured person detected by the vital signs data detection unit 25. Specifically, it can first determine the target air pressure of the airbag pressure strap 2 based on the vital signs data of the injured person detected by the vital signs data detection unit 25, and then adjust the airbag pressure strap 2 from the current air pressure to the target air pressure according to the preset pressure increase and decrease rules.

[0033] The controller 1 can first determine the target air pressure of the airbag pressure strap 2 based on the vital signs data of the injured person. Specifically, the controller 1 can substitute the vital signs data of the injured person into the target air pressure calculation formula shown in Formula 1 below to calculate the target air pressure.

[0034] Formula 1 in, This is a correction factor for the injury site. Specifically, it is automatically assigned a value after identifying the injury site of the casualty through the pressure distribution sensor array built into the airbag compression strap. For example, if the injury site is the chest... It can be 1.2 when the injury site is on the limbs. It can be 0.8, and the specific value should be determined based on the actual situation.

[0035] After calculating the target air pressure, the airbag inflator strap 2 needs to be adjusted from the current air pressure to the target air pressure. In practical applications, the airbag inflator strap 2 can be adjusted from the current air pressure to the target air pressure according to a preset pressure adjustment rule. This preset pressure adjustment rule specifies how to adjust the airbag inflator strap 2 from the current air pressure to the target air pressure. In practical applications, there are several methods, some of which are illustrated here.

[0036] For example, one approach is to set a fixed rate of pressure increase and decrease to adjust the airbag inflator strap 2 from the current air pressure to the target air pressure. In this way, after obtaining the target air pressure, the airbag inflator strap 2 can be adjusted from the current air pressure to the target air pressure according to the fixed rate of pressure increase and decrease.

[0037] The second method is to first determine the air pressure adjustment amount based on the target air pressure and the current air pressure. For example, the air pressure adjustment amount can be the difference between the target air pressure and the current air pressure. Then, the air pressure adjustment amount is divided into multiple intervals, and for each interval, the corresponding pressure increase and decrease rate is used to increase and decrease the pressure, so that the airbag pressurization strap 2 is finally adjusted from the current air pressure to the target air pressure.

[0038] For example, the pressure adjustment can be divided into three intervals. The first interval can be the first 30% of the pressure adjustment (0%-30%), the third interval can be the last 30% (80%-100%), and the second interval can be the middle 40% (30%-80%). In this way, a first pressure adjustment rate can be used in the first interval, a second rate in the second interval, and a third rate in the third interval. The second rate is greater than the third rate, and the third rate is greater than or equal to the first rate.

[0039] The first, second, and third pressure rise and fall rates are all dynamically adjusted by the controller according to the type of injury. For example, when the type of injury is detected as a fracture, the controller automatically reduces the first pressure rise and fall rate by 30% and reduces the second pressure fall rate in the second zone from 40% to 20%, thereby avoiding secondary injuries caused by sudden changes in air pressure.

[0040] In this way, a relatively fast rate of pressure increase and decrease is used in the middle 40% of the air pressure adjustment, while a relatively slow rate of pressure increase and decrease is used in the first and third intervals. Ultimately, the airbag pressurization strap 2 is adjusted from the current air pressure to the target air pressure. This method can further ensure the health of the injured.

[0041] It should be further explained that in practical applications, besides directly using the first or second method described above to adjust the airbag inflator strap 2 from the current air pressure to the target air pressure, other methods can also be used. For example, the first and second methods can be combined to adjust the airbag inflator strap 2 from the current air pressure to the target air pressure. For instance, the air pressure adjustment amount can be determined first based on the target air pressure and the current air pressure, and then it can be determined whether the air pressure adjustment amount is greater than a preset threshold. If it is greater, it means that the air pressure adjustment amount is large, and the second method described above is used for adjustment. That is, the air pressure adjustment amount is divided into multiple intervals, and different inflation and deflation rates are used for each different interval. If the air pressure adjustment amount is less than or equal to the preset threshold, it means that the air pressure adjustment amount is relatively small, and the first method described above can be used for adjustment. That is, a fixed inflation and deflation rate is set to adjust the airbag inflator strap 2 from the current air pressure to the target air pressure.

[0042] In addition, to adjust the air pressure in the airbag pressure strap 2, an air pump 9 can be installed in the life support stretcher. This air pump 9 can then be used to introduce or remove air from the airbag pressure strap 2 to adjust its pressure. In practical applications, the air pump 9 can be located at the bottom of the stretcher body 3 and connected to the airbag pressure strap 2 via a pipe.

[0043] The structure of the airbag pressure strap 2 can be explained here, such as... Figure 3 The diagram shows the specific structure of the airbag pressure strap 2, which has four layers. The airbag pressure strap 2 has a multi-layer structure, with a flexible skin-friendly layer 21 on the surface, a stress-bearing layer 22 in the middle, a memory metal support frame 24 next, and an airbag 23 as the innermost layer.

[0044] In one embodiment, the shape memory metal support frame 24 is made of nickel-titanium alloy and is used to automatically expand when the air pressure drops suddenly. Specifically, it can automatically spring open when the air pressure is below 20 kPa to form a mechanical support structure, preventing the casualty from shifting due to the loosening of the binding straps. Furthermore, the automatic expansion of the shape memory metal support frame 24 has a response time L, where L ≤ 0.1 s.

[0045] This allows the air pump 9 to inject air into the airbag 23 to increase the air pressure in the airbag pressure band 2, and the air pump 9 can also extract air from the airbag 23 to decrease the air pressure in the airbag pressure band 2. In addition, the vital signs data detection unit 25 also includes a photoelectric blood oxygen sensor array. The photoelectric blood oxygen sensor array (sampling rate 1Hz, accuracy ±2%) and a miniature body temperature sensor are embedded in the flexible skin-friendly layer 21 to facilitate real-time monitoring of the injured person's blood oxygen saturation and body temperature changes. Furthermore, the airbag pressure band 2 is also equipped with Velcro for easy binding of the injured person.

[0046] It should be further explained that injured persons often experience bleeding, so hemostasis is frequently necessary during transport using a life support stretcher. Therefore, the life support stretcher provided in this embodiment can also be equipped with an airbag tourniquet, which can be used to stop bleeding from the injured person's wounds. Specifically, hemostasis is achieved by pressurizing the airbag tourniquet. Generally, higher air pressure in the airbag tourniquet results in better hemostasis, but excessive pressure may also affect the injured person's health; therefore, the air pressure in the airbag tourniquet needs to be controlled. Specifically, in this embodiment, the controller 1 can also be used to control the air pressure in the airbag tourniquet.

[0047] For example, the controller 1 can first determine the target air pressure in the airbag tourniquet, and then adjust the airbag tourniquet from the current air pressure to the target air pressure. Specifically, the controller can determine the target air pressure in the airbag tourniquet using the following formula: Formula 2: A=K+B+C+D In Formula 2, A is the target air pressure of the airbag tourniquet; B is the influence of the patient's blood pressure on the target air pressure; C is the influence of the patient's age on the target air pressure; D is the influence of the patient's gender on the target air pressure; K is a preset constant, and in one embodiment, the value of K can be automatically set according to the limb location, for example: the K value in the upper limb airbag tourniquet is 4 kPa, the K value in the trunk airbag tourniquet is 8 kPa, and the K value in the lower limb airbag tourniquet is 6.7 kPa.

[0048] Therefore, the value of the preset constant K can be determined first based on the actual situation, and then the values ​​of B, C and D can be determined respectively. Then, they can be substituted into Formula 2 above to calculate the target air pressure A of the airbag tourniquet.

[0049] Considering the possibility of injuries to different parts of the injured person, the airbag tourniquets installed on the life support stretcher can include upper limb airbag tourniquets and lower limb airbag tourniquets. The upper limb airbag tourniquet is located at the upper end of the stretcher body 3 to stop bleeding in the upper limbs of the injured person, and the lower limb airbag tourniquet is located at the lower end of the stretcher body 3 to stop bleeding in the lower limbs of the injured person.

[0050] In one embodiment, the life support stretcher is also equipped with multiple ultrasonic ranging sensors 4.

[0051] The upper limb airbag tourniquet and the lower limb airbag tourniquet adopt an independent air circuit design. The upper limb airbag tourniquet has a built-in first air circuit, and the lower limb airbag tourniquet has a built-in second air circuit. The controller is connected to the first air circuit, the second air circuit and the ultrasonic ranging sensor 4. The ultrasonic ranging sensor 4 (accuracy ±1mm) is used to measure the circumference of the upper limb and the circumference of the lower limb and transmit the data to the controller.

[0052] The controller is used to receive the above-mentioned upper limb circumference value, determine the relationship between the upper limb circumference value and the first preset circumference value, and adjust the inflation volume in the first air path according to the determination result to adjust its internal air pressure.

[0053] The controller is also used to receive the lower limb circumference value mentioned above, and to determine the relationship between the lower limb circumference value and the second preset circumference value. Based on the determination result, the controller adjusts the inflation volume in the second air path to achieve the internal air pressure of the regulator.

[0054] For example, if the first preset circumference value is 30cm, when the upper limb circumference value detected by the ultrasonic ranging sensor 4 is >30cm, the controller sends a control signal to the air pump to control the amount of air pumped into the tourniquet of the airbag, so as to limit the maximum inflation pressure in the first air circuit to 35kPa and avoid overpressure injury.

[0055] Due to the differences between the upper and lower limbs of the human body, the upper limb airbag tourniquet and the lower limb airbag tourniquet can each correspond to different preset constants K. For example, the preset constant K (referred to as K1) of the upper limb airbag tourniquet can be 4 kPa, and the preset constant K (referred to as K2) of the lower limb airbag tourniquet can be 6.7 kPa.

[0056] The value of B can be determined in the following way: for example, the patient's blood pressure can be obtained first, and then this blood pressure can be substituted into the empirical formula for the effect of blood pressure on air pressure, as shown in Formula 3, to calculate the value of B. Based on the linear conversion formula of the patient's systolic blood pressure (SBP), combined with the medical standard for tourniquet pressure (usually 20-50 mmHg higher than systolic blood pressure), the calculation model of the effect of blood pressure on target air pressure is used.

[0057] Formula 3 Where SBP is systolic blood pressure, β is the blood pressure grading coefficient, and 0.133 is a unit conversion factor that converts the unit of the systolic blood pressure from mmHg to kPa (1 mmHg ≈ 0.133 kPa) to ensure consistency with the unit (kPa) of the target pressure A. For example, if the injured person's systolic blood pressure is 120 mmHg, then... This is converted to 120 × 0.133 ≈ 16 kPa.

[0058] 5 is a safety margin constant, and its unit is kPa. It is set according to the clinical tourniquet pressure standard. For example, when the pressure of the upper limb air-cushioned tourniquet needs to be 20-30 mmHg higher than the systolic blood pressure, or when the pressure of the upper limb air-cushioned tourniquet needs to be 40-50 mmHg higher than the systolic blood pressure, 5 kPa corresponds to approximately 37.6 mmHg, which can meet the routine safety redundancy requirements.

[0059] For example: In one embodiment, when SBP=100mmHg, B=(100×0.133)+5=18.3kPa, at which point 5kPa corresponds to approximately 137mmHg, which is higher than the systolic blood pressure of 37mmHg; When SBP=80mmHg, B=(80×0.133)+5=15.64kPa. At this time, 5kPa corresponds to approximately 117mmHg, which is higher than the systolic blood pressure of 37mmHg.

[0060] Medical logic support: Because tourniquet pressure must exceed arterial systolic pressure to effectively block blood flow, Formula 3 uses a unit conversion factor for linear conversion and adds a safety margin constant to ensure that the B value is dynamically adjusted with blood pressure while meeting the basic hemostatic pressure requirements (e.g., upper limb blood pressure ≥40kPa, lower limb blood pressure ≥60kPa).

[0061] Furthermore, in the above embodiments, β is the blood pressure grading coefficient, which can be automatically assigned a value through the blood pressure grading algorithm built into the controller. This application introduces a blood pressure grading coefficient. When SBP < 90 mmHg, i.e., in a hypotensive state, the blood pressure grading coefficient can be increased to raise the hemostatic pressure and compensate for the hypotensive state. When 90 mmHg ≤ SBP ≤ 140 mmHg, the blood pressure grading coefficient can be within the normal range and used as a standard coefficient. When SBP > 140 mmHg (hypertension), i.e., in a hypertensive state, the blood pressure grading coefficient can be decreased to reduce the hemostatic pressure and avoid overpressure injury. This application's embodiment, by setting a blood pressure grading coefficient, can further improve hemostasis safety and personalization.

[0062] For the value of D in Formula 2 above, based on industry experience, the influence values ​​of male and female on the target air pressure can be generated in advance. For example, the influence value of male on the target air pressure is D1, and the influence value of female on the target air pressure is D2. The value of D is automatically determined by obtaining the gender of the injured person. If it is male, the value of D is D1, and if it is female, the value of D is D2.

[0063] In one embodiment, the gender of the injured person can be obtained by manual input by medical staff.

[0064] In another embodiment, the gender of the injured person can be identified by further installing a depth camera 14 in the support stretcher.

[0065] Because men have larger average limb circumference and muscle thickness than women, and clinical data shows that the average upper limb circumference of adult men is 3-5 cm larger than that of women, men need to increase the pressure by 2 kPa compared to the target pressure to ensure hemostasis, while women need to decrease the pressure by 1 kPa compared to the target pressure to avoid overpressure injury.

[0066] Similarly, for the value of C in Formula 2 above, the influence value of the target air pressure corresponding to different age groups can be predetermined based on industry experience. This allows us to obtain the actual age of the injured person, and then, based on the age group to which the actual age belongs, the influence value of the target air pressure corresponding to that age group can be obtained as the value of C. The actual age of the injured person can also be input by medical staff, or the injured person's facial image can be captured by camera 11, and the actual age can be estimated based on the facial image. Alternatively, the patient's medical record information can be obtained through the communication module installed in the life support stretcher, and the patient's actual age can be determined based on the medical record information.

[0067] For example, it can be divided into two age groups: (1) Youth to middle age (age≤60): Since the elasticity of blood vessels decreases with age, the C value needs to decrease by 0.05 kPa for each year of age increase in this age group. For example, at age 60, C=5-0.05 60 = 2 kPa.

[0068] (2) Old age stage (age>60): Fix the C value at 2kPa to avoid excessive pressure reduction leading to insufficient hemostasis. Although the blood vessels of the human body are less elastic in the old age stage, the hemostasis needs still require the guarantee of basic pressure. Therefore, the C value can be fixed at the basic value.

[0069] Of course, in order to facilitate the input of information by medical staff, the controller 1 can be equipped with a touch screen 12, so that medical staff can input relevant information through the touch screen 12.

[0070] In one embodiment, such as Figure 4-5 As shown, the controller 1 is also equipped with a card reader 13. If the injured person carries identification (such as an ID card, social security card, etc.), the identification information can be read directly through the card reader 13. If there is no other information, a depth camera 14 is also set on the back of the controller. The depth camera 14 can capture the information of the injured person and share it to the controller in real time, so as to realize the recording of the whole process when the injured person is placed on the stretcher.

[0071] Therefore, using the life support stretcher provided in this application embodiment, after placing the injured person on the stretcher body 3, the injured person is further bound by the airbag pressure binding strap 2. In this way, the vital sign data detection unit 25 in the airbag pressure binding strap 2 can detect the vital sign data of the injured person, thereby enabling the controller 1 to use the vital sign data of the injured person, for example, by substituting the vital sign data of the injured person into the above formula 1, to calculate the target air pressure of the airbag pressure binding strap 2, and then adjust the airbag pressure binding strap 2 from the current air pressure to the target air pressure according to the preset pressure rise and fall rules.

[0072] Of course, if the injured person needs to stop the bleeding, the airbag pressure tourniquet in the life support stretcher can be used to stop the bleeding. Specifically, the controller 1 can determine the target air pressure in the airbag pressure tourniquet through the above formula 2, and then adjust the airbag pressure tourniquet from the current air pressure to the target air pressure, thereby stopping the bleeding of the injured person.

[0073] Referring to 6-9, in one embodiment, the life support stretcher has a pneumatic-mechanical double-locking structure.

[0074] Specifically, the air pressure locking structure: In one embodiment, a pressure locking valve 6 is connected in series in the air path of the airbag 23 of the airbag pressure strap 2. The pressure locking valve 6 is connected to the controller and has pressure sensing and automatic locking functions. The pressure locking valve 6 is equipped with a pressure sensor and an electromagnetic locking mechanism. When the pressure inside the airbag 23 reaches the target air pressure value calculated by the controller 1 based on the vital signs data of the injured person, a pressure signal is sent to the pressure sensor. When the pressure sensor inside the pressure locking valve 6 receives the pressure signal during the inflation process and detects that the pressure value inside the airbag 23 is equal to the target pressure value, the electromagnetic locking mechanism is triggered to lock and close the air path.

[0075] For example, if the target air pressure of the airbag pressure strap 2 is calculated to be 15 kPa, a pressure signal is sent to the pressure sensor. When the pressure sensor detects that the air pump 9 is inflating the airbag 23 to 15 kPa, the air pressure locking valve 6 is quickly triggered to lock the air passage and prevent the air pressure from decreasing due to leakage caused by the air passage not being closed in time, so as to maintain the stability of the binding pressure of the airbag pressure strap 2 on the injured person.

[0076] Mechanical locking structure: In one embodiment, the airbag pressurization strap 2 is further provided with a plurality of mechanical locking buckles 7, which are located on the outside of the force-bearing layer 22 and are evenly spaced along the length of the airbag pressurization strap 2, for example, the interval between the mechanical locking buckles 7 is 10cm.

[0077] The mechanical locking catch 7 includes a locking hook, a locking groove, and a spring return device.

[0078] When the airbag pressure restraint strap 2 is wrapped around the injured person and tightened, the locking hook will automatically engage in the corresponding locking groove. The spring return device is connected to the locking hook and the locking groove, providing additional locking force to the mechanical locking buckle 7 to further stabilize the locking state of the airbag pressure restraint strap 2. For example, during the transfer of the injured person on a life support stretcher, if the airbag 23 ruptures unexpectedly, causing a sudden drop in air pressure, the mechanical locking buckle 7, due to the connection between the locking hook and the locking groove, ensures that the airbag pressure restraint strap 2 will not completely loosen, and can still provide basic fixation for the injured person.

[0079] This embodiment of the application, by setting a structure of dual air pressure and mechanical locking, enables the mechanical locking buckle 7 to maintain the binding of the injured person even if the air pressure of the airbag 23 is unexpectedly reduced, thus preventing the injured person from shifting due to loose binding.

[0080] Similarly, the air-pressure tourniquet is also equipped with the aforementioned air pressure-mechanical dual locking structure.

[0081] In one embodiment, a pressure locking valve 6 is provided inside the airbag pressure tourniquet. When the controller 1 calculates the target air pressure of the airbag pressure tourniquet using Formula 2 and controls the air pump 9 to adjust the air pressure inside the airbag pressure tourniquet to the target value, the pressure locking valve 6 is triggered to immediately lock the air path.

[0082] For example, for a lower limb airbag tourniquet, if the target air pressure calculated by the controller 1 according to Formula 2 is 60 kPa, when the air pump 9 inflates the airbag tourniquet to 60 kPa, the air pressure locking valve 6 quickly rotates to the locking position to close the air path and ensure that the airbag tourniquet can provide stable hemostatic pressure for the injured person.

[0083] The life support stretcher provided in this application embodiment has a pneumatic-mechanical dual-locking safety redundancy mechanism, which can reduce the risk of secondary trauma during the transfer process.

[0084] The following is a detailed description of the workflow of a life support stretcher provided in one embodiment of this application: After the injured person is placed on the stretcher, the airbag pressure bandage is used to secure them. Once secured, the vital signs data detection unit monitors the injured person's vital signs and transmits the data to the controller. The controller calculates the target air pressure of the airbag pressure bandage based on the vital signs data and adjusts the airbag pressure bandage from the current pressure to the target pressure to immobilize the injured person. If bleeding occurs, the controller determines the target inflation volume of the airbag pressure tourniquet. Simultaneously, based on the identification of the injury site, the inflation volume of the airbag pressure tourniquet at the corresponding location is adjusted according to the target inflation volume. For example, the circumference values ​​of the upper and lower limbs are detected by an ultrasonic ranging sensor, and their relationship with preset values ​​is determined to adjust the corresponding inflation volume.

[0085] In one embodiment, an adjustable mechanical locking strap is provided on the outer layer of the air-cushioned tourniquet. The mechanical locking strap is made of nylon, which has high strength and a serrated anti-slip texture on its surface. It is connected to the tourniquet body by a metal buckle. When the air-cushioned tourniquet is inflated and reaches the target air pressure, the mechanical locking strap is wrapped around the limb and tightened. The tightness is adjusted by the metal buckle and then locked.

[0086] The mechanical locking band provides additional pressure maintenance, ensuring that even if the pneumatic locking valve 6 malfunctions or the air circuit of the air-cushioned tourniquet leaks, the mechanical locking band remains locked, maintaining a certain hemostatic pressure and preventing the hemostatic effect from being severely compromised. For example, in complex environments such as battlefields, if the air pressure system of the air-cushioned tourniquet is damaged, the mechanical locking band can still continue to assist the air-cushioned tourniquet in achieving hemostasis.

[0087] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A life support stretcher, characterized in that, The life support stretcher is equipped with a controller and an airbag-assisted restraint strap for securing the injured person, wherein: The airbag pressure strap is equipped with a vital sign data detection unit for detecting the vital signs data of the injured person. The vital sign data specifically includes any one or more of the following: heart rate, respiratory parameters, blood pressure, body temperature, and blood oxygen saturation. The controller is used to control the air pressure in the airbag pressure bandage according to the vital signs data of the injured person detected by the vital signs data detection unit. The air pressure in the airbag pressure bandage reflects the tightness of the airbag pressure bandage on the injured person.

2. The life support stretcher according to claim 1, characterized in that, Based on the vital signs data of the injured person detected by the vital signs data detection unit, the air pressure in the airbag pressure strap is controlled, specifically including: Based on the vital signs data of the injured person detected by the vital signs data detection unit, the target air pressure of the airbag pressurization strap is determined. According to the preset pressure increase and decrease rules, the airbag pressurization strap is adjusted from the current air pressure to the target air pressure.

3. The life support stretcher according to claim 2, characterized in that, Based on the vital signs data of the injured person detected by the vital signs data detection unit, the target air pressure of the airbag compression strap is determined. Specifically, this involves substituting the vital signs data of the injured person into the target air pressure calculation formula shown below to calculate the target air pressure: in, This is a correction factor for the location of the injury.

4. The life support stretcher according to claim 2, characterized in that, According to the preset pressure adjustment rules, the airbag pressurization straps are adjusted from the current air pressure to the target air pressure, specifically including: The pressure adjustment amount is determined based on the target pressure and the current pressure. The air pressure adjustment amount is divided into multiple intervals, and for each interval, the air pressure is adjusted using the corresponding rate of increase and decrease, so as to adjust the airbag pressurization strap from the current air pressure to the target air pressure.

5. The life support stretcher according to claim 4, characterized in that, The pressure adjustment is divided into multiple intervals, and for each interval, a corresponding pressure increase / decrease rate is used for pressure adjustment, specifically including: The air pressure adjustment amount is divided into three intervals: the first interval is the first 30% of the air pressure adjustment amount, the third interval is the last 30% of the air pressure adjustment amount, and the second interval is the middle 40% of the air pressure adjustment amount. In the first interval, a first boost / buck rate is used for boosting / bucking; in the second interval, a second boost / buck rate is used for boosting / bucking; and in the third interval, a third boost / buck rate is used for boosting / bucking. The second boost / buck rate is greater than the third boost / buck rate, and the third boost / buck rate is greater than or equal to the first boost / buck rate. The first, second, and third rates of blood pressure elevation and depression are all adjusted according to the type of trauma.

6. The life support stretcher according to claim 1, characterized in that, The life support stretcher includes a stretcher body; and, The stretcher body is equipped with multiple airbag pressure binding straps.

7. The life support stretcher according to claim 6, characterized in that, The stretcher body is equipped with three airbag pressure binding straps, which are used to bind the upper torso, waist and legs of the wounded. Each of the airbag pressurization straps has an array of pressure distribution sensors on its inner side.

8. The life support stretcher according to claim 1, characterized in that, The life support stretcher is also equipped with an airbag tourniquet and multiple ultrasonic ranging sensors. The airbag tourniquet includes an upper limb airbag tourniquet and a lower limb airbag tourniquet. The upper limb airbag tourniquet has a first air passage, and the lower limb airbag tourniquet has a second air passage. The controller is connected to the first air passage, the second air passage, and the ultrasonic ranging sensors. The ultrasonic ranging sensors are used to measure the circumference of the upper limb and the circumference of the lower limb and transmit the data to the controller. The controller is also used to receive the upper limb circumference value and adjust the inflation volume in the first air passage, and to receive the lower limb circumference value and adjust the inflation volume in the second air passage.

9. The life support stretcher according to claim 8, characterized in that, The controller determines the target air pressure in the airbag tourniquet in the following manner: Wherein, A is the target air pressure in the airbag tourniquet; K is a preset constant; B is the influence of the patient's blood pressure on the target air pressure; C is the influence of the patient's age on the target air pressure; and D is the influence of the patient's gender on the target air pressure.

10. The life support stretcher according to claim 8, characterized in that, The airbag-type pressure tourniquet has a built-in memory metal support frame, which is used to automatically expand when the air pressure drops suddenly.

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