Intelligent pressure sore prevention turning bed based on multi-source physiological signal fusion and early warning method

Abstract

The invention relates to the technical field of medical apparatus and instruments, in particular to an intelligent pressure sore prevention turning bed based on multi-source physiological signal fusion and an early warning method.The intelligent pressure sore prevention turning bed comprises a turning bed upper assembly and a turning bed lower assembly and further comprises a leg moving plate, a back moving plate and a disinfection lamp strip, and the leg moving plate and the back moving plate are arranged on the turning bed upper assembly; the disinfection lamp strip is arranged on a bedside supporting plate of the turning-over bed upper assembly, the turning-over bed upper assembly is fixedly connected with the turning-over bed lower assembly through a first connecting rod, a driving assembly is arranged on the turning-over bed lower assembly, and by starting the driving assembly, the leg moving plate is turned over and rotated up and down, and the back moving plate is turned over and rotated left and right. According to the intelligent pressure sore prevention turning bed based on multi-source physiological signal fusion and the early warning method, data such as a pressure thermodynamic diagram are generated in real time by fusing multi-source physiological signals, and the accuracy and the real-time performance of pressure sore risk identification are remarkably improved; a turning-over path is generated through the driving assembly, so that the leg and back movable plates are turned over.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to an intelligent pressure ulcer prevention turning bed and early warning method based on multi-source physiological signal fusion. Background Technology

[0002] Traditional pressure ulcer prevention relies primarily on manual, timed turning. However, its efficiency and effectiveness are limited by the experience and standardization of caregivers, and it cannot monitor the distribution of pressure on the patient's skin and changes in subcutaneous tissue in real time. Conventional turning devices often use mechanical angle adjustments, lacking dynamic feedback of physiological signals. The turning motion can easily generate shear forces or localized pressure, increasing the risk of epidermal damage. Furthermore, areas prone to prolonged bed rest are susceptible to bacterial growth, but existing equipment generally lacks integrated environmental disinfection functions, potentially exacerbating the risk of skin infections.

[0003] Current pressure ulcer early warning technologies are mostly based on single sensing methods (such as pressure or temperature and humidity monitoring), making it difficult to comprehensively assess the risk of tissue damage. For example, pressure sensors can only reflect the pressure on the epidermis and cannot capture early pathological changes such as subcutaneous tissue edema and insufficient blood perfusion; impedance detection devices, if used independently, may ignore the synergistic effect of accumulated epidermal pressure and body position time. This single-dimensional data collection and analysis method is prone to delays or misjudgments in risk warnings, making it difficult to provide accurate decision-making basis for personalized care.

[0004] Therefore, we propose an intelligent pressure ulcer prevention turning bed and early warning method based on multi-source physiological signal fusion. Summary of the Invention

[0005] One of the technical problems this application aims to solve is that bacteria can easily grow in areas where patients are bedridden for extended periods, but existing equipment generally does not integrate environmental disinfection functions, which may exacerbate the risk of skin infections; and the single-dimensional data collection and analysis method is prone to delays or misjudgments in risk warnings, making it difficult to provide accurate decision-making basis for personalized care.

[0006] To address the aforementioned technical issues, this application provides an intelligent anti-pressure ulcer turning bed and early warning method based on multi-source physiological signal fusion, including an upper turning bed component, a lower turning bed component, a leg movement board, a back movement board, and a disinfection light strip; The upper component of the turning bed is equipped with a leg movable board and a back movable board. The disinfection light strip is set on the bedside support board of the upper component of the turning bed. The upper component of the turning bed and the lower component of the turning bed are fixedly connected by a connecting rod. The lower part of the turning bed is equipped with a drive component. By activating the drive component, the leg movable board can be turned up and down, and the back movable board can be turned left and right.

[0007] In some embodiments, a bedside support plate is provided in the front-to-back direction of the upper component of the turning bed, and bedside support rods are provided in the left and right directions of the upper component of the turning bed. The disinfection light strip on the bedside support plate is used to irradiate and disinfect the area after the patient turns over.

[0008] In some embodiments, the leg movable plate is rotatably connected to the upper assembly of the turning bed via a shaft. The bottom surface of the leg movable plate is provided with a folding rod two that is rotatably connected thereto. The folding rod two is rotatably connected to the folding rod one, and the folding rod one is rotatably connected to the connecting seat one. The connecting seat one is provided on the lower assembly of the turning bed.

[0009] In some embodiments, a connecting rod 2 is provided between the connecting seats 1, and an auxiliary component with a semi-circular hole is provided above the connecting rod 2. The size of the semi-circular hole is larger than the diameter of the connecting rod 2. An arc groove is provided on the auxiliary component, and a connecting rod 3 is provided in the arc groove. One end of the connecting rod 3 is fixedly connected to the connecting rod 3 fixedly provided on the connecting rod 2, and the other end of the connecting rod 3 passes through the arc groove and is fixedly connected to the connecting component. The other side of the connecting component is connected to the motor.

[0010] In some embodiments, the back movable plate includes a left plate and a right plate, both of which are rotatably connected to a shaft two. The bottom surfaces of the left and right plates are provided with connecting seats two, which are rotatably connected to an electric telescopic rod. The setting direction of connecting seats two is perpendicular to that of connecting seats one.

[0011] In some embodiments, the upper component of the turning bed and the lower component of the turning bed further integrate the following modules: The signal acquisition module includes a partitioned mattress set on the leg movement board and the back movement board, and a flexible pressure sensor matrix and electrode bioelectrical impedance array embedded in the mattress for synchronously acquiring epidermal pressure distribution and subcutaneous tissue electrical impedance data. The data processing module is configured with a timestamp compensation algorithm to align pressure data and impedance data and output real-time pressure thermograms, tissue electrical impedance change rates, and historical body position timelines. The decision engine dynamically generates a shear-resistant turning path based on edema risk indices such as pressure heatmaps, impedance change rates, and body position time axes.

[0012] In some embodiments, the intelligent pressure ulcer prevention early warning method based on multi-source physiological signal fusion includes the following steps: S1: Simultaneously acquire epidermal pressure distribution data and subcutaneous tissue electrical impedance data; S2: Integrates real-time pressure heatmaps, tissue electrical impedance change rates, and historical body position timelines to predict pressure ulcer risk areas; S3: Dynamically generates anti-shear force turning paths based on the edema risk index, and controls the back and leg drive components to perform zoned turning; S4: Activate the disinfection light strip during the turning process to instantly sterilize the air-empty area.

[0013] In some embodiments, a pressure ulcer risk area is predicted when the local sustained pressure is >45 mmHg and the rate of decrease in electrical impedance is >15%, and the area is identified as a high-risk area.

[0014] In some embodiments, the execution of the shear force-resistant turning path satisfies a shear force < 15N.

[0015] In some embodiments, after the turning-over command is triggered, the disinfection light strip is activated simultaneously for 60 seconds.

[0016] This invention has at least the following beneficial effects: 1. By integrating multi-source physiological signals, such as epidermal pressure distribution and subcutaneous tissue impedance data collected by flexible pressure sensors and bioelectrical impedance sensors, the system generates real-time pressure heatmaps, impedance change rates, and positional timeline data, significantly improving the accuracy and real-time performance of pressure ulcer risk identification. Utilizing a timestamp compensation algorithm for efficient data alignment, the system can accurately predict high-risk areas. For example, when local sustained pressure exceeds the threshold of 45 mmHg and the impedance decrease rate exceeds 15%, an orange alert is triggered to prompt early intervention. This data-driven decision-making mechanism not only reduces the risk of misjudgment but also enables precise localization of potential pressure ulcer areas, thereby helping healthcare professionals respond promptly and prevent the condition from worsening.

[0017] 2. The system dynamically generates a shear-resistant turning path through a drive component, controlling the shear force to within 15N. It intelligently controls the leg and back movement boards to perform zoned turning, such as raising the legs by 15° and tilting the back to the right by 28°, effectively avoiding skin damage caused by friction during turning. Simultaneously, a disinfection light strip is activated in the vacated area for 60 seconds to sterilize and inhibit bacterial growth. This automated process reduces the burden of manual care and ensures gentle and precise turning movements, helping patients maintain a comfortable position and fundamentally reducing the risk of pressure ulcers and infection. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a side view of the overall structure of the present invention; Figure 3 for Figure 2 Enlarged view of point A; Figure 4 A schematic diagram of the overall structure of the invention from another perspective; Figure 5 for Figure 4 Enlarged view at point B in the middle; Figure 6 This is a flowchart illustrating the method.

[0019] In the diagram, 100-Upper part of the turning bed; 101-Bedside support plate; 102-Bedside support rod; 103-Connecting rod one; 200-Lower part of the turning bed; 201-Electric telescopic rod; 202-Folding rod one; 203-Folding rod two; 204-Connecting seat one; 205-Connecting rod two; 206-Auxiliary parts; 207-Circular groove; 208-Motor; 209-Connector; 210-Connecting rod three; 211-Connecting seat two; 212-Connecting rod four; 213-Semi-circular hole; 300-Leg movable plate; 301-Shaft one; 400-Back movable plate; 401-Shaft two; 403-Left side plate; 404-Right side plate; 500-Disinfection light strip. Detailed Implementation

[0020] Example 1, please refer to Figures 1-5 The present invention provides a technical solution: a smart anti-pressure ulcer turning bed with multi-source physiological signal fusion, including an upper turning bed component 100, a lower turning bed component 200, and also a leg movement board 300, a back movement board 400, and a disinfection light strip 500. The upper component 100 of the turning bed is equipped with a leg movable plate 300 and a back movable plate 400. The disinfection light strip 500 is installed on the bedside support plate 101 of the upper component 100 of the turning bed. The upper component 100 of the turning bed and the lower component 200 of the turning bed are fixedly connected by a connecting rod 103. The lower component 200 of the turning bed is equipped with a drive component. By activating the drive component, the leg movable plate 300 is turned up and down, and the back movable plate 400 is turned left and right.

[0021] Specifically, the drive mechanism of the lower component 200 of the turning bed independently controls the vertical rotation of the leg movement board 300 and the horizontal rotation of the back movement board 400, enabling zoned adjustment of the body's back and legs. Its core advantage lies in the fact that, through the linkage of the drive component with folding rod mechanisms such as folding rod one 202 and folding rod two 203, and connecting seat one 204, it can precisely control the leg elevation angle, such as 15°, and independently adjust the back tilt angle, such as tilting to the right at 28°. This zoned drive mechanism can strictly limit the shear force generated during the turning motion to within 15N, avoiding skin friction damage caused by overall body twisting in traditional turning operations, while meeting the differentiated pressure distribution needs of different body positions, ensuring the safety and adaptability of the movement from a physical structure perspective.

[0022] The separate, independent movement design of the leg movement board 300 and the back movement board 400 allows for precise adjustment of the rolling motion. The vertical rotation of the leg movement board 300 (via the linkage between the folding rod 203 and the connecting seat 204) specifically promotes blood circulation in the lower limbs, reducing the risk of pressure sores on the legs; while the horizontal rotation of the back movement board 400 (achieved by the electric telescopic rod 201 pushing the connecting seat 211) focuses on relieving pressure on the sacrum and coccyx. The separate movement trajectories of the two ensure that different areas of the body receive customized pressure relief support.

[0023] The disinfection light strip 500 is integrated into the bedside support plate 101 of the upper component 100 of the turning bed, enabling the disinfection function and body position adjustment to form a coordinated response mechanism. Specifically, when the drive component triggers a turning action, such as the leg movement plate 300 being raised and the back movement plate 400 being tilted to the side, the empty bed surface area is automatically exposed to the irradiation range of the disinfection light strip 500, achieving immediate sterilization for 60 seconds.

[0024] The disinfection light strip 500 is integrated into the bedside support plate 101 of the upper component 100 of the turning bed, achieving functional synergy through structural coupling: when the drive component triggers the backrest movable plate 400 to flip, the empty area is automatically exposed to the direct irradiation range of the disinfection light strip 500, and the sterilization action is completed synchronously with the turning operation. Simultaneously, the lower component 200 of the turning bed serves as the power hub, with its built-in motor 208 converting rotational motion into lifting force for the leg movable plate 300 through a transmission chain formed by connecting rod four 212, auxiliary component 206, and connecting rod two 205. This mechatronic design ensures structural stability, such as the rigid fixation of connecting rod one 103, and precise movement, such as the constraint of the arc groove 207 on the movement trajectory of connecting rod four 212, significantly reducing the risk of execution deviation.

[0025] Example 2, please refer to Figure 1-5 The upper component of the turning bed 100 is provided with a bedside support plate 101 in the front and back direction, and the upper component of the turning bed 100 is provided with a bedside support rod 102 in the left and right directions. The disinfection light strip 500 on the bedside support plate 101 is used to irradiate and disinfect the area after the patient turns over.

[0026] Specifically, the disinfection light strip 500 is mounted on the bedside support plate 101 of the upper component 100 of the turning bed, so that its light path covers the exposed areas (such as the sacrum, coccyx, and hips) after the patient's body is moved away when turning over. This position is designed based on the spatial distribution characteristics of high-risk pressure areas of the human body (areas that can directly contact the bed board when lying down), ensuring that the sterilization light irradiation and the vacated area are precisely overlapped, avoiding blind spots in local disinfection caused by deviations in the irradiation angle.

[0027] The bedside support rods 102 of the upper component 100 of the turning bed provide rigid support on both the left and right sides, forming a stable frame together with the front and rear bedside support plates 101 to resist the torque load when the backrest movable plate 400 tilts. At the same time, the structural characteristics (continuous plane) of the bedside support plate 101 provide a high-strength mounting base for the disinfection light strip 500, enabling the sterilization component to achieve full coverage without additional supports.

[0028] Example 3, see Figure 1-5 The leg movable plate 300 is rotatably connected to the upper assembly 100 of the turning bed via shaft 301. The bottom surface of the leg movable plate 300 is provided with a folding rod 203 rotatably connected thereto. The folding rod 203 is rotatably connected to the folding rod 202. The folding rod 202 is rotatably connected to the connecting seat 204. The connecting seat 204 is provided on the lower assembly 200 of the turning bed.

[0029] Specifically, the leg movable plate 300 is rotatably connected to the upper assembly 100 of the turning bed via shaft 301, forming a basic rotation fulcrum. A folding rod 203 is provided at the bottom and is hinged to the movable plate. The transmission chain of the linkage folding rod 202 is hinged at the end of the folding rod 202 to the connecting seat 204 of the lower assembly 200 of the turning bed, which converts the horizontal driving force output by the lower assembly 200 of the turning bed into a multi-stage lifting force.

[0030] The rotating connection design between the second folding rod 203 and the bottom surface of the leg movable plate 300 ensures that the direction of the thrust is always tangent to the movement trajectory of the plate during the lifting process, avoiding structural deformation caused by lateral forces. Simultaneously, the rotating joint between the first folding rod 202 and the first connecting seat 204 directly transmits the driving load to the rigid frame of the lower assembly 200 of the turning bed. Stress is dispersed through components such as the second connecting rod 205, significantly reducing the local torque load on the shaft 301.

[0031] All transmission components, such as folding rod 203, folding rod 202, and connecting seat 204, can be folded and stored in the narrow space between the lower part of the turning bed assembly 200 and the upper part of the turning bed assembly 100 when not in use. Compared to traditional hydraulic or rack and pinion drive mechanisms, this folding rod system design saves longitudinal installation space, allowing the lower part of the turning bed assembly 200 to accommodate a more powerful drive module, such as the motor 208, while ensuring that the patient's height from the ground meets medical safety standards.

[0032] Example 4, see Figure 1-5A connecting rod 205 is provided between the connecting seats 204. An auxiliary component 206 with a semi-circular hole 213 is provided above the connecting rod 205. The size of the semi-circular hole 213 is larger than the diameter of the connecting rod 205. An arc groove 207 is provided on the auxiliary component 206. A connecting rod 212 is provided in the arc groove 207. One end of the connecting rod 212 is fixedly connected to the connecting rod 210 fixedly provided on the connecting rod 205. The other end of the connecting rod 212 passes through the arc groove 207 and is fixedly connected to the connecting component 209. The other side of the connecting component 209 is connected to the motor 208.

[0033] Specifically, the auxiliary component 206 forms a clearance fit with the connecting rod 205 through the semi-circular hole 213, allowing the connecting rod 205 to undergo a slight adaptive wobble during rotation. Simultaneously, the arc groove 207 precisely defines the swing path of the connecting rod 212, forcibly constraining the circular motion output by the motor 208 into a fixed-axis arc motion. This design ensures that the direction of the driving force remains tangential to the axis of the connecting rod 205, continuously providing a lifting torque during counter-clockwise rotation, avoiding the dead-point problem of traditional linkage mechanisms, and ensuring that the lifting action of the leg movable plate 300 is completed without jamming.

[0034] The two ends of connecting rod four 212 are rigidly connected to connecting rod three 210 and connecting member 209, respectively, forming a portal force transmission structure spanning auxiliary member 206. When motor 208 drives connecting member 209 to rotate, the force is directly transmitted to connecting rod two 205 through connecting rod four 212 and arc groove 207, rather than relying on the friction of auxiliary member 206, significantly reducing transmission loss. With the radial limiting function of semi-circular hole 213 for connecting rod two 205, this structure maintains the rigidity of the transmission chain even when subjected to reverse loads on folding rod one 202, such as patient weight pressure, preventing axial movement of connecting rod two 205 that could lead to inaccurate movements.

[0035] The connector 209 is detachably connected to the output shaft of the motor 208, thus physically isolating the power modules such as the motor 208, connector 209, and connecting rod four 212 from the actuator module connecting rod two 205 and folding rod one 202. When maintenance is required, the two modules can be separated simply by removing the fixing bolts of connector 209, without disassembling auxiliary parts 206 or connecting seat one 204 and other structural components.

[0036] Example 5, see Figure 1-5 The back movable plate 400 includes a left plate 403 and a right plate 404. Both the left plate 403 and the right plate 404 are rotatably connected to the shaft 401. The bottom surface of the left plate 403 and the right plate 404 is provided with a connecting seat 211. The connecting seat 211 is rotatably connected to the electric telescopic rod 201. The setting direction of the connecting seat 211 is perpendicular to that of the connecting seat 204.

[0037] Specifically, the left side panel 403 and the right side panel 404 are connected by a second shaft 401 for bidirectional rotation, allowing the two back panels to move independently, such as raising only the left side or tilting alternately on both sides. The connecting seat 211, hinged to the electric telescopic rod 201 at its bottom, is oriented perpendicular to the connecting seat 204, ensuring that the direction of the driving force is orthogonal to the rotation plane of the back panel 400. This design, by separating the driving force transmission paths on the left and right sides, avoids interference between bilateral movements, providing patients with multiple positional switching modes such as side tilting and supine lying, and specifically alleviating the problem of concentrated pressure on one side of the trunk.

[0038] The rotating connection design between the electric telescopic rod 201 and the connecting seat 211 ensures that when the left side panel 403 or the right side panel 404 is flipped, the linear thrust of the telescopic rod is always decomposed along the normal direction of the panel surface. For example, when tilted to the right at 28°, it forms a normal lifting component and a tangential anti-slip component. Combined with the vertical layout of the connecting seat 211 and the lower assembly 200 of the turning bed, this structure effectively suppresses the lateral shear force generated by the backrest movable plate 400 during rotation, keeping it within a 15N threshold and preventing sliding friction damage between the patient's skin and the mattress.

[0039] The space between Connector 211 and Connector 1 204 is orthogonally arranged, allowing the electric telescopic rod 201 of the back drive unit and the folding rod 202 of the leg drive unit to be arranged in layers within the lower assembly 200 of the turning bed, avoiding pipeline intersections. When it is necessary to upgrade the drive power or add sensors, the single-side connector module can be disassembled and installed independently, such as replacing only the left connector 211, without adjusting the overall frame structure.

[0040] Example 6, see Figure 1-5 The upper component 100 and lower component 200 of the turning bed also integrate the following modules: The signal acquisition module includes a partitioned mattress set on the leg movement plate 300 and the back movement plate 400, and a flexible pressure sensor matrix and a 16-electrode bioelectrical impedance array embedded in the mattress for synchronously acquiring epidermal pressure distribution and subcutaneous tissue electrical impedance data. The data processing module is configured with a timestamp compensation algorithm to align pressure data and impedance data and output real-time pressure thermograms, tissue electrical impedance change rates, and historical body position timelines. The decision engine dynamically generates a shear-resistant turning path based on edema risk indices such as pressure heatmaps, impedance change rates, and body position time axes.

[0041] Specifically, the signal acquisition module integrates a flexible pressure sensor matrix and a 16-electrode bioelectrical impedance array on the surfaces of the leg movement plate 300 and the back movement plate 400 to achieve synchronous monitoring of epidermal pressure distribution and subcutaneous tissue status. The pressure sensors capture local pressure peaks (e.g., ischial tuberosity region > 32 mmHg threshold), while the bioelectrical impedance array detects tissue fluid accumulation characteristics (e.g., impedance decrease rate > 15% due to edema) through multi-frequency excitation signals. The coupling of these two data can identify early risks that cannot be determined by traditional single parameters (e.g., epidermal pressure is not excessive but subcutaneous ischemic edema has occurred), providing three-dimensional data support for the dynamic assessment of pathological progress.

[0042] The data processing module employs a timestamp compensation algorithm to eliminate the time difference between the acquisition of pressure and impedance signals (sampling rate 10Hz), generating a spatiotemporally aligned fusion dataset. The real-time output pressure heatmap visually displays high-risk areas of pressure on the body surface (e.g., a red warning area covering the sacrum and coccyx), the tissue impedance change rate curve reflects the metabolic state of deep tissues, and the historical position timeline quantifies the duration of continuous pressure on each area (e.g., a warning is triggered if the patient lies on their left side for more than 2 hours). This multi-dimensional visualization analysis enables caregivers to quickly locate risk sources, avoiding subjective errors and information lag issues inherent in manual recording.

[0043] The decision engine, based on an edema risk index model, weights and fuses pressure gradient, impedance attenuation slope, and position holding time (with weighting coefficients of 0.5, 0.3, and 0.2, respectively), automatically generating a turning path that balances biomechanical safety and patient comfort. For example, when the impedance decrease rate of the left hip exceeds a threshold, the right side plate 404 is preferentially lifted by 28°, coordinated with the leg movement plate 300 lifted by 15°, forming a progressive side-turning movement that resists shear force. This strategy breaks through the traditional mechanical mode of timed turning, realizing a paradigm shift in pressure ulcer prevention from "experience-based judgment" to "data-driven."

[0044] Example 7, see Figure 6 The intelligent pressure ulcer prevention and early warning method based on multi-source physiological signal fusion includes the following steps: S1: Simultaneously acquire epidermal pressure distribution data and subcutaneous tissue electrical impedance data; S2: Integrates real-time pressure heatmaps, tissue electrical impedance change rates, and historical body position timelines to predict pressure ulcer risk areas; S3: Dynamically generates anti-shear force turning paths based on the edema risk index, and controls the back and leg drive components to perform zoned turning; S4: During the turning process, the disinfection light strip 500 is activated to instantly sterilize the vacated area.

[0045] Pressure ulcer risk areas are predicted when the local sustained pressure is >45 mmHg and the rate of decrease in electrical impedance is >15%, and the area is identified as a high-risk area. The execution of the shear force-resistant turning path must meet the requirement of shear force <15 N. Upon triggering the turning command, a 500nm disinfection lamp is simultaneously activated for 60 seconds.

[0046] Specifically, S1 establishes a correlation between biomechanical properties and tissue metabolic state by simultaneously collecting epidermal pressure distribution and subcutaneous tissue impedance. A high-risk assessment is triggered when localized sustained pressure >45 mmHg (the critical value for capillary closure) combined with an impedance decrease rate >15% (a marker of abnormal tissue fluid accumulation) occurs in the area covered by the leg exercise board 300 or the back exercise board 400. This quantitative standard overcomes the limitations of traditional single pressure monitoring in terms of misjudgment (such as the hysteresis effect of subcutaneous tissue pressure in obese patients), enabling precise localization of early tissue ischemia and edema.

[0047] S3 dynamically generates a turning path based on the edema risk index, and forcibly limits the tilt angle and speed of the electric telescopic rod 201 pushing the back movable plate 400 (e.g., unilateral lifting <5° / second), ensuring that the shear force during execution is <15N (the threshold for damage to the dermal layer of the skin). Simultaneously, the folding rod 202 drives the leg movable plate 300 to lift 15°, forming synchronous support between the trunk and lower limbs, avoiding secondary pressure injuries caused by local limb suspension. This control logic transforms biomechanical protection principles into electromechanical constraints, significantly reducing the risk of iatrogenic injury during nursing procedures.

[0048] S4 activates the disinfection light strip 500 the instant the turning command is triggered, and uses the space freed up by the backrest movable plate 400 to perform 60 seconds of ultraviolet disinfection on the exposed area (such as the sacral and coccygeal bed surface). This design achieves the spatiotemporal coupling of the mechanical movement of the upper component 100 of the turning bed with the sterilization function: the extension process of the electric telescopic rod 201 automatically aligns the target area with the core light area of ​​the disinfection light strip 500 (irradiance > 90μW / cm²), maximizing sterilization efficiency without the need for additional lamp position adjustments.

[0049] All operating steps incorporate strict timing logic: the drive component is only allowed to perform the reset action after 60 seconds of disinfection irradiation; if the impedance decrease rate remains >10% during the turning process, the same area is prohibited from being subjected to pressure again for more than 30 minutes. This real-time feedback control based on the data processing module ensures the timeliness of sterilization while fundamentally avoiding cumulative tissue damage caused by improper operation frequency by using data-driven constraints on mechanical movements.

[0050] The following is combined with Figures 1-6 Explain the specific process: The process is as follows: A signal acquisition module is formed by embedding a flexible pressure sensor, a bioelectrical impedance sensor, and a body posture recognition strain gauge in the mattress. The signal acquisition module transmits the acquired epidermal pressure / subcutaneous edema data to the data processing module. The data processing module integrates three types of data: real-time pressure thermogram, tissue electrical impedance change rate, and historical body position timeline. Based on this data, the data processing module predicts pressure ulcer risk areas. The data module transmits this data to the decision engine. The decision engine dynamically generates an anti-shear force turning path based on the edema risk index, and simultaneously controls the drive components to raise and lower the back and legs to avoid shear force generated during turning. At the same time, the disinfection light strip 500 embedded in the bed frame automatically irradiates the airborne area during turning to sterilize the airborne area.

[0051] The specific usage process of the drive component is as follows: When the pressure sensing layer detects a continuous pressure >45mmHg (threshold 32mmHg) on ​​the sacrum and coccyx, and the impedance layer shows a 18% decrease in local tissue resistance (threshold 15%), the decision engine triggers an immediate orange alarm, generating a turning instruction. The left side plate 403 tilts 28° to the right while simultaneously raising the leg movement plate 300 by 15°. Then, the motor 208 is started, and the shaft of the motor 208 rotates counterclockwise, driving the connecting piece 209 to rotate counterclockwise. This, in turn, drives the connecting rod four 212 to rotate counterclockwise along the arc groove 207 of the auxiliary piece 206, which in turn drives the connecting rod three 210 to rotate counterclockwise. Since the connecting rod three 210 is fixedly connected to the connecting rod two 205, it drives the connecting rod two 205 to rotate counterclockwise. Furthermore, since the connecting rod two 205 is connected to the folding rod one 202... The fixed connection causes the folding rod 202 to rotate counterclockwise. This counterclockwise rotation of the folding rod 202 causes the folding rod 203 to rotate clockwise around the axis of the folding rod 202. This changes the folding rods 202 and 203 from a folded state to an extended state. The folding rod 203 then pushes the leg movement plate 300 upwards, causing the leg movement plate 300 to rotate around axis 301, thus raising the patient's leg. Simultaneously, the electric telescopic rod 201 is activated, pushing the left side plate 403 upwards. The left side plate 403 rotates around axis 401, thus rotating to the right by a certain angle, allowing the patient to turn to the right and improve their condition, reducing the risk of pressure sores.

Claims

1. An intelligent pressure ulcer prevention turning bed based on multi-source physiological signal fusion, comprising an upper turning bed component (100) and a lower turning bed component (200), characterized in that: It also includes a leg movement board (300), a back movement board (400), and a disinfection light strip (500); The upper component of the turning bed (100) is provided with the leg movable plate (300) and the back movable plate (400), and the disinfection light strip (500) is provided on the bedside support plate (101) of the upper component of the turning bed (100). The upper component of the turning bed (100) and the lower component of the turning bed (200) are fixedly connected by a connecting rod (103). The lower part of the turning bed (200) is equipped with a drive assembly. By activating the drive assembly, the leg movable plate (300) is rotated up and down, and the back movable plate (400) is rotated left and right.

2. The intelligent pressure ulcer prevention turning bed based on multi-source physiological signal fusion according to claim 1, characterized in that: The upper component of the turning bed (100) is provided with a bedside support plate (101) in the front and back direction, and the upper component of the turning bed (100) is provided with bedside support rods (102) on the left and right sides. The disinfection light strip (500) on the bedside support plate (101) is used to irradiate and disinfect the area after the patient turns over.

3. The intelligent pressure ulcer prevention turning bed based on multi-source physiological signal fusion according to claim 1, characterized in that: The leg movable plate (300) is rotatably connected to the upper assembly (100) of the turning bed via a shaft (301). The bottom surface of the leg movable plate (300) is provided with a folding rod (203) rotatably connected thereto. The folding rod (203) is rotatably connected to the folding rod (202). The folding rod (202) is rotatably connected to the connecting seat (204). The connecting seat (204) is provided on the lower assembly (200) of the turning bed.

4. The intelligent pressure ulcer prevention turning bed based on multi-source physiological signal fusion according to claim 3, characterized in that: A connecting rod 2 (205) is provided between the connecting seats 1 (204). An auxiliary component (206) with a semi-circular hole (213) is provided above the connecting rod 2 (205). The size of the semi-circular hole (213) is larger than the diameter of the connecting rod 2 (205). An arc groove (207) is provided on the auxiliary component (206). A connecting rod 4 (212) is provided in the arc groove (207). One end of the connecting rod 4 (212) is fixedly connected to the connecting rod 3 (210) fixedly provided on the connecting rod 2 (205). The other end of the connecting rod 4 (212) passes through the arc groove (207) and is fixedly connected to the connecting component (209). The other side of the connecting component (209) is connected to the motor (208).

5. The intelligent pressure ulcer prevention turning bed based on multi-source physiological signal fusion according to claim 4, characterized in that, The back movable plate (400) includes a left side plate (403) and a right side plate (404). The left side plate (403) and the right side plate (404) are rotatably connected to the shaft two (401). The bottom surface of the left side plate (403) and the right side plate (404) is provided with a connecting seat two (211). The connecting seat two (211) is rotatably connected to the electric telescopic rod (201). The setting direction of the connecting seat two (211) is perpendicular to that of the connecting seat one (204).

6. The intelligent pressure ulcer prevention turning bed based on multi-source physiological signal fusion according to claim 1, characterized in that, The upper component (100) and lower component (200) of the turning bed also integrate the following modules: The signal acquisition module includes a partitioned mattress set on the leg movement board (300) and the back movement board (400), and a flexible pressure sensor matrix and a 16-electrode bioelectrical impedance array embedded in the mattress for synchronous acquisition of epidermal pressure distribution and subcutaneous tissue electrical impedance data. The data processing module is configured with a timestamp compensation algorithm to align pressure data and impedance data and output real-time pressure thermograms, tissue electrical impedance change rates, and historical body position timelines. The decision engine dynamically generates a shear-resistant turning path based on edema risk indices such as pressure heatmaps, impedance change rates, and body position time axes.

7. An intelligent pressure ulcer prevention and early warning method based on multi-source physiological signal fusion, wherein the intelligent pressure ulcer prevention and turning bed based on multi-source physiological signal fusion as described in claim 6 is characterized in that, Includes the following steps: S1: Simultaneously acquire epidermal pressure distribution data and subcutaneous tissue electrical impedance data; S2: Integrates real-time pressure heatmaps, tissue electrical impedance change rates, and historical body position timelines to predict pressure ulcer risk areas; S3: Dynamically generate anti-shear force turning path based on edema risk index, and control the drive components of the back and legs to perform zoned turning; S4: Activate the disinfection light strip (500) during the turning process to perform immediate sterilization on the vacated area.

8. The intelligent pressure ulcer prevention and early warning method based on multi-source physiological signal fusion according to claim 7, characterized in that: The pressure ulcer risk area is predicted when the local continuous pressure is >45 mmHg and the rate of decrease in electrical impedance is >15%, and the area is identified as a high-risk area.

9. The intelligent pressure ulcer prevention and early warning method based on multi-source physiological signal fusion according to claim 7, characterized in that: The execution of the shear force-resistant turning path must satisfy the shear force < 15N.

10. The intelligent pressure ulcer prevention and early warning method based on multi-source physiological signal fusion according to claim 7, characterized in that: After the turning command is triggered, the disinfection light strip (500) is activated simultaneously for 60 seconds.

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