Body surface gradient pressurizing device and method based on electrochromic composite material

Abstract

The invention discloses a body surface gradient pressurizing device and method based on an electrochromic composite material. The device comprises a flexible pressurizing pad and a dynamic feedback control module, the flexible light-weight pressurizing pad is used for covering all areas, needing to be pressurized, of the body surface and pressurizing and comprises electrochromic composite fibers, and when the electrochromic composite fibers are connected with the voltage, the higher the voltage is, the higher the temperature is, and the higher the shrinkage rate is; the dynamic feedback control module comprises pressure sensors and a controller, and the pressure sensors are embedded in the flexible light-weight pressurizing pads and used for monitoring pressure applied by the flexible light-weight pressurizing pads. And the controller can control the voltage of each flexible light-weight pressurizing pad according to the feedback of each pressure sensor so as to enable each flexible light-weight pressurizing pad to apply the required pressure and realize gradient pressurization. The device can perform gradient pressurization, and is convenient to adjust, quick in response and light in system weight.

Description

Technical Field

[0001] This invention belongs to the field of anti-G equipment, specifically relating to a body surface gradient pressure device and method based on electrochromic composite materials. Background Technology

[0002] As the maneuverability of fighter jets continues to improve, the risk of pilots losing consciousness due to G-forces becomes increasingly apparent. Applying pressure to the pilot's body surface, especially the lower limbs, using anti-G equipment can counteract the upward shift of blood to the upper body, ensuring blood and oxygen supply to the eyes and brain, and is an effective way to address loss of consciousness due to high G-forces.

[0003] Traditional anti-G equipment uses an airbag structure to achieve uniform pressure distribution, but it cannot dynamically adjust the pressure gradient according to human physiological characteristics. In addition, it also has drawbacks such as slow response speed and heavy system weight. Summary of the Invention

[0004] The purpose of this invention is to provide a body surface gradient pressure device based on electrochromic composite materials and a body surface gradient pressure method based on electrochromic composite materials. The device can perform gradient pressure, is easy to adjust, has a fast response, and is lightweight.

[0005] The technical solution adopted in this invention is: A body surface gradient pressurization device based on electrochromic composite materials includes flexible pressurizing pads and a dynamic feedback control module. The flexible lightweight pressurizing pads are used to cover and pressurize the required areas of the body surface. They contain electrochromic composite fibers. When the electrochromic composite fibers are energized, the higher the voltage, the higher the temperature, and the higher the temperature, the greater the shrinkage rate. The dynamic feedback control module includes pressure sensors and a controller. The pressure sensors are embedded in each flexible lightweight pressurizing pad and are used to monitor the pressure applied by each flexible lightweight pressurizing pad. The controller can control the voltage of each flexible lightweight pressurizing pad according to the feedback of each pressure sensor so that each flexible lightweight pressurizing pad can apply the required pressure and achieve gradient pressurization.

[0006] Preferably, the electrochromic composite fiber is a material composed of conductive polymer and shape memory material in a core-sheath structure, with a diameter of 150-450 μm, a sheath thickness of 18%-20%, an operating voltage of 5-50V, a corresponding temperature range of 35℃-55℃, and a corresponding shrinkage rate of 15%-40%.

[0007] Preferably, the electrochromic composite fibers are woven to form an electrochromic composite fiber cloth, and the electrochromic composite fiber cloth is blended with textile fabric to form a flexible lightweight pressure pad, the thickness of which is 0.5-1.2 mm.

[0008] Preferably, the electrochromic composite fiber cloth is arranged in a distributed network on the flexible lightweight pressure pad.

[0009] Preferably, each flexible lightweight pressure pad corresponds to three areas requiring pressure: the calf, the area above and below the knee, and the thigh; or, it corresponds to four areas requiring pressure: the calf, the area above and below the knee, the thigh, and the abdomen; the pressure applied by each flexible lightweight pressure pad decreases from bottom to top.

[0010] Preferably, when each flexible lightweight pressure pad corresponds to the three required pressure areas of the calf, above and below the knee, and thigh, the pressure applied by each flexible lightweight pressure pad from the calf to the root of the thigh is 40 mmHg, 35 mmHg, and 30 mmHg, respectively; when each flexible lightweight pressure pad corresponds to the four required pressure areas of the calf, above and below the knee, thigh, and abdomen, the pressure applied by each flexible lightweight pressure pad from the calf to the abdomen is 40 mmHg, 35 mmHg, 30 mmHg, and 25 mmHg, respectively.

[0011] Preferably, the controller performs PID control on the feedback pressure and the set pressure, and dynamically adjusts the voltage according to the deviation ΔP between the feedback pressure and the set pressure: when ΔP > 3 mmHg, ±2V step adjustment is used, and when ΔP ≤ 3 mmHg, PID closed-loop fine adjustment is enabled to ensure that the pressure fluctuation rate is < 5%.

[0012] Preferably, when the controller receives feedback that the instantaneous pressure fluctuation amplitude is greater than 15% of the set value, it controls the reduction of the voltage of the corresponding flexible lightweight pressure pad to reduce the pressure to a safe threshold.

[0013] Preferably, the dynamic feedback control module further includes a temperature sensor, which is embedded in each flexible lightweight pressure pad, or the temperature sensor and pressure sensor are integrated into a temperature-pressure sensor; the controller automatically cuts off the power supply when the temperature at any single point received from the feedback exceeds 58°C.

[0014] A method for gradient pressure application on the body surface based on electrochromic composite materials is proposed. This method utilizes flexible lightweight pressure pads containing electrochromic composite fibers to cover and pressurize the required areas of the body surface. When the electrochromic composite fibers are energized, the higher the voltage, the higher the temperature, and the greater the shrinkage rate. The pressure applied by each flexible lightweight pressure pad is monitored, and the voltage of each flexible lightweight pressure pad is controlled based on the feedback pressure to allow each flexible lightweight pressure pad to apply the required pressure and achieve gradient pressure application.

[0015] The beneficial effects of this invention are: This device fully utilizes the properties of electrochromic composite fibers, indirectly regulating the applied pressure by adjusting its voltage (voltage determines temperature, temperature determines shrinkage rate, and shrinkage rate determines applied pressure). It is convenient to adjust, has a fast response, and high feedback accuracy. Furthermore, by covering the required pressure areas on the body surface with flexible, lightweight pressure pads, gradient pressure can be applied to various areas of the pilot's body, improving the pilot's G-force resistance (based on relevant domestic and international physiological research, a gradient pressure mode with gradually increasing pressure from top to bottom in the lower limbs is more conducive to G-force resistance). Moreover, the flexible, lightweight pressure pads are small in size, easy to wear, and the system is lightweight. This device can be used not only for pilot G-force resistance but also in astronaut pressure suits and medical pressure therapy devices, and has wide applications in the field of human body surface pressure. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the connection of a flexible, lightweight pressure pad.

[0017] In the diagram: 1-Controller; 2-Data cable; 3-Wire; 4-Electrochromic composite fiber cloth; 5-Flexible lightweight pressure pad; 6-Pressure sensor. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0020] The features and performance of this application will be further described in detail below with reference to the embodiments.

[0021] Example 1 This application discloses a body surface gradient pressure device based on electrochromic composite materials, including a flexible pressure pad 5 and a dynamic feedback control module. The flexible lightweight pressure pad 5 is used to cover and pressurize each required pressure area on the body surface. It contains electrochromic composite fibers. When the electrochromic composite fibers are energized, the higher the voltage, the higher the temperature, and the higher the temperature, the greater the shrinkage rate. The dynamic feedback control module includes a pressure sensor 6 and a controller 1. The pressure sensor 6 is embedded in each flexible lightweight pressure pad 5 and is used to monitor the pressure applied by each flexible lightweight pressure pad 5. The controller 1 can control the voltage of each flexible lightweight pressure pad 5 according to the feedback of each pressure sensor 6 so that each flexible lightweight pressure pad 5 can apply the required pressure and achieve gradient pressure. This device fully utilizes the characteristics of electrochromic composite fibers, indirectly regulating the applied pressure by adjusting its voltage (voltage determines temperature, temperature determines shrinkage rate, and shrinkage rate determines the applied pressure). It is easy to adjust, has a fast response, and high feedback accuracy. Furthermore, by covering the required pressure areas on the body surface with the flexible lightweight pressure pad 5, gradient pressure can be applied to the pilot's body surface, improving the pilot's overload resistance (based on relevant physiological research data at home and abroad, a gradient pressure mode with gradually increasing pressure from top to bottom in the lower limbs is more conducive to overload resistance). In addition, the flexible lightweight pressure pad 5 is small in size, easy to wear, and the system is lightweight.

[0022] In this embodiment, the electrochromic composite fiber is a material composed of a conductive polymer and a shape memory material in a core-sheath structure. Its diameter is 150-450 μm, the sheath thickness accounts for 18%-20%, the working voltage of the electrochromic composite fiber is 5-50V, the corresponding temperature range is 35℃-55℃, and the corresponding shrinkage rate is 15%-40%.

[0023] In this embodiment, electrochromic composite fibers are woven to form electrochromic composite fiber cloth 4, and electrochromic composite fiber cloth 4 is blended with textile fabric to form flexible lightweight pressure pad 5. The thickness of flexible lightweight pressure pad 5 is 0.5-1.2mm. This setting can reduce the total weight of the system to 55%-65% of that of traditional airbag equipment (with the same protection level), while the dynamic energy consumption is ≤15w through pulse width modulation optimization.

[0024] In this embodiment, as Figure 1 As shown, the electrochromic composite fiber cloth 4 is arranged in a distributed network on the flexible lightweight pressure pad 5. The controller 1 receives feedback from each pressure sensor 6 through the data line 2 and transmits voltage to the electrochromic composite fiber cloth 4 through the wire 3.

[0025] In this embodiment, each flexible lightweight pressure pad 5 corresponds to three areas requiring pressure: the calf, the area above and below the knee, and the thigh. The pressures applied by each flexible lightweight pressure pad from the calf to the root of the thigh are 40 mmHg, 35 mmHg, and 30 mmHg, respectively. Alternatively, each flexible lightweight pressure pad 5 corresponds to four areas requiring pressure: the calf, the area above and below the knee, the thigh, and the abdomen. The pressures applied by each flexible lightweight pressure pad 5 from the calf to the abdomen are 40 mmHg, 35 mmHg, 30 mmHg, and 25 mmHg, respectively.

[0026] In this embodiment, the controller 1 performs PID control on the feedback pressure and the set pressure, and dynamically adjusts the voltage according to the deviation ΔP between the feedback pressure and the set pressure: when ΔP > 3 mmHg, ±2V step adjustment is used, and when ΔP ≤ 3 mmHg, PID closed-loop fine adjustment is enabled to ensure that the pressure fluctuation rate is < 5%.

[0027] In this embodiment, when the controller 1 receives feedback that the instantaneous pressure fluctuation amplitude is greater than 15% of the set value, it controls the reduction of the voltage of the corresponding flexible lightweight pressure pad 5 to reduce the pressure to a safe threshold. This can reduce the local pressure to a safe threshold (<20 mmHg) within 0.1s, thus avoiding tissue damage.

[0028] In this embodiment, the dynamic feedback control module also includes a temperature sensor, which is embedded in each flexible lightweight pressure pad 5, or the temperature sensor and pressure sensor 6 are integrated into a temperature-pressure sensor; the controller 1 automatically cuts off the power supply when it receives feedback that the temperature at any single point exceeds 58°C to prevent high-temperature burns.

[0029] Application example: Electrosensitive composite fibers with a diameter of 450µm are selected and woven to form an electrosensitive composite fiber cloth 4. The electrosensitive composite fiber cloth 4 is blended with ordinary aramid to form a flexible and lightweight pressure pad 5, which covers four pressure areas: the calf, above and below the knee, the thigh, and the abdomen, to apply gradient pressure. Table 1. Electrochromic composite fiber arrangement density and effective pressure area ratio in each region

[0030] Table 2 Target pressure and corresponding contraction rate and voltage for each region

[0031] This device can be used not only in anti-G situations for pilots, but also in astronaut pressure suits and medical pressure treatment devices, and can be widely used in fields related to pressure on the human body surface.

[0032] Example 2 This embodiment discloses a gradient pressure method for the body surface based on electrochromic composite materials. A flexible lightweight pressure pad 5 containing electrochromic composite fibers is used to cover each area of ​​the body surface that needs to be pressurized and apply pressure. When the electrochromic composite fibers are energized, the higher the voltage, the higher the temperature, and the higher the temperature, the greater the shrinkage rate. The pressure applied by each flexible lightweight pressure pad 5 is monitored, and the voltage of each flexible lightweight pressure pad 5 is controlled according to the feedback pressure so that each flexible lightweight pressure pad 5 can apply the required pressure and achieve gradient pressure.

[0033] The embodiments described above are some, but not all, of the embodiments of this application. The detailed description of the embodiments of this application is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

Claims

1. A body surface gradient pressure device based on electrochromic composite materials, characterized in that: It includes flexible pressure pads and a dynamic feedback control module. The flexible lightweight pressure pads are used to cover and pressurize the required areas of the body surface. They contain electrochromic composite fibers. When the electrochromic composite fibers are energized, the higher the voltage, the higher the temperature, and the higher the temperature, the greater the shrinkage rate. The dynamic feedback control module includes pressure sensors and a controller. The pressure sensors are embedded in each flexible lightweight pressure pad and are used to monitor the pressure applied by each flexible lightweight pressure pad. The controller can control the voltage of each flexible lightweight pressure pad according to the feedback of each pressure sensor so that each flexible lightweight pressure pad can apply the required pressure and achieve gradient pressurization.

2. The body surface gradient pressure device based on electrochromic composite material as described in claim 1, characterized in that: Electrochromic composite fiber is a material composed of conductive polymer and shape memory material in a core-sheath structure. Its diameter is 150-450um, the sheath thickness accounts for 18%-20%, the working voltage of electrochromic composite fiber is 5-50V, the corresponding temperature range is 35℃-55℃, and the corresponding shrinkage rate is 15%-40%.

3. The body surface gradient pressure device based on electrochromic composite material as described in claim 1, characterized in that: Electrochromic composite fibers are woven to form an electrochromic composite fiber cloth, which is then blended with textile fabric to form a flexible lightweight pressure pad with a thickness of 0.5-1.2 mm.

4. The body surface gradient pressure device based on electrochromic composite material as described in claim 1, characterized in that: Electrochromic composite fiber cloth is arranged in a distributed network on a flexible, lightweight pressure pad.

5. The body surface gradient pressure device based on electrochromic composite material as described in claim 1, characterized in that: Each flexible lightweight pressure pad corresponds to one of the three areas requiring pressure: the calf, the area above and below the knee, and the thigh; or, it corresponds to one of the four areas requiring pressure: the calf, the area above and below the knee, the thigh, and the abdomen. The pressure applied by each flexible lightweight pressure pad decreases from bottom to top.

6. The body surface gradient pressure device based on electrochromic composite material as described in claim 5, characterized in that: When each flexible lightweight pressure pad corresponds to one of the three areas requiring pressure—the calf, the area above and below the knee, and the thigh—the pressure applied by each flexible lightweight pressure pad from the calf to the root of the thigh is 40 mmHg, 35 mmHg, and 30 mmHg, respectively. When each flexible lightweight pressure pad corresponds to one of the four areas requiring pressure—the calf, the area above and below the knee, the thigh, and the abdomen—the pressure applied by each flexible lightweight pressure pad from the calf to the abdomen is 40 mmHg, 35 mmHg, 30 mmHg, and 25 mmHg, respectively.

7. The body surface gradient pressure device based on electrochromic composite material as described in claim 1, characterized in that: The controller performs PID control based on the feedback pressure and the set pressure, and dynamically adjusts the voltage according to the deviation ΔP between the feedback pressure and the set pressure: when ΔP > 3 mmHg, ±2V step adjustment is used, and when ΔP ≤ 3 mmHg, PID closed-loop fine adjustment is enabled to ensure that the pressure fluctuation rate is < 5%.

8. The body surface gradient pressure device based on electrochromic composite material as described in claim 1, characterized in that: When the controller receives feedback that the instantaneous pressure fluctuation exceeds 15% of the set value, it will control the reduction of the voltage of the corresponding flexible lightweight pressure pad to reduce the pressure to a safe threshold.

9. The body surface gradient pressure device based on electrochromic composite material as described in claim 1, characterized in that: The dynamic feedback control module also includes a temperature sensor, which is embedded in each flexible lightweight pressure pad, or the temperature sensor and pressure sensor are integrated into a temperature-pressure sensor; the controller automatically cuts off the power supply when the temperature at any single point of feedback exceeds 58°C.

10. A method for applying gradient pressure to the body surface based on electrochromic composite materials, characterized in that: Flexible lightweight pressure pads containing electrochromic composite fibers are used to cover and pressurize the required areas of the body surface. When the electrochromic composite fibers are energized, the higher the voltage, the higher the temperature, and the higher the temperature, the greater the shrinkage rate. The pressure applied by each flexible lightweight pressure pad is monitored, and the voltage of each flexible lightweight pressure pad is controlled according to the feedback pressure so that each flexible lightweight pressure pad can apply the required pressure and achieve gradient pressurization.

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