Spine health supporting mattress system based on displacement sensing and motion capture

Abstract

The invention discloses a spine health support mattress system based on displacement sensing and motion capture, comprising: a mattress body, the interior of which is provided with a support adjustment layer distributed along a corresponding area of a spine; the displacement sensing module comprises a plurality of linear displacement sensors which are arranged on the surface of the mattress body in the length direction of the mattress and correspond to the spine of the human body; the motion capture module comprises a plurality of inertial sensors and is used for collecting spine intervertebral angle data in real time; the data processing module is electrically connected with the displacement sensing module and the motion capturing module and is used for generating a support adjusting instruction; the support adjusting module is electrically connected with the data processing module, is arranged in the support adjusting layer and is used for adjusting the support hardness of the corresponding area of the mattress according to the support adjusting instruction. By monitoring the prone position spine form and the intervertebral angle in real time, the supporting performance of the mattress is dynamically optimized, personalized precise supporting is achieved, the natural physiological curvature of the spine is maintained, and spine diseases are prevented.

Description

Technical Field

[0001] This invention relates to the field of mattress design, and more specifically to a spinal health support mattress system based on displacement sensing and motion capture. Background Technology

[0002] As the core component of the sleep environment, the mattress comes into direct contact with the human spine, and its support performance is a key factor in determining whether the spine can maintain its natural physiological curvature while lying down. Proper support can evenly distribute body weight and reduce spinal pressure, while improper support may lead to abnormal spinal shape, and long-term use may even induce spinal diseases such as neck, shoulder, back and leg pain, and herniated discs.

[0003] In recent years, spinal diseases have shown a trend of high incidence and younger onset, becoming a significant health issue affecting the population. Studies have shown a close relationship between supine spinal morphology and mattress support performance: a normal spine has physiological curvatures of cervical lordosis, thoracic kyphosis, lumbar lordosis, and sacral kyphosis, a structure fundamental to maintaining body balance and cushioning impacts during movement. A mattress that is too soft can lead to excessive spinal curvature, while one that is too firm can cause localized pressure concentration, both potentially disrupting the natural curvature of the spine and causing biomechanical imbalance. Therefore, there is an urgent need to develop a spinal health support system integrating high-precision sensing and intelligent adjustment technologies. This system could dynamically optimize mattress support performance by monitoring real-time changes in supine spinal morphology and intervertebral angles, achieving precise maintenance of the natural curvature of the spine and providing technical support for the prevention of spinal diseases. Summary of the Invention

[0004] The purpose of this invention is to provide a spinal health support mattress system based on displacement sensing and motion capture. This invention can dynamically optimize mattress support performance by monitoring the spinal morphology and intervertebral angles in real time during lying posture, achieving personalized and precise support to maintain the natural physiological curvature of the spine and prevent spinal diseases.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a spinal health support mattress system based on displacement sensing and motion capture, comprising: The mattress body has an internal support and adjustment layer distributed along the corresponding area of ​​the spine; The displacement sensing module includes multiple linear displacement sensors, which are arranged along the length of the mattress on the surface of the mattress body at positions corresponding to the human spine, and are used to collect sagittal plane depth data of each measurement point of the spine in a lying position in real time. The motion capture module includes multiple inertial sensors, which are fixed at the vertebral body markers of the human spine to collect intervertebral angle data in real time. The data processing module is electrically connected to the displacement sensing module and the motion capture module, respectively, and is used to receive the sagittal plane depth data and intervertebral angle data, analyze the conformity between the spinal morphology and the reference standing posture, and generate support adjustment commands. The support adjustment module, electrically connected to the data processing module, is located within the support adjustment layer and is used to adjust the support firmness of the corresponding area of ​​the mattress according to the support adjustment command.

[0006] The aforementioned spinal health support mattress system based on displacement sensing and motion capture has 13 linear displacement sensors in the displacement sensing module. The linear displacement sensors are arranged at equal intervals along the length of the mattress, with a spacing of 60mm between adjacent sensors. The first sensor corresponds to the position of the C1 vertebra in the human body, and the last sensor covers the sacral region.

[0007] The aforementioned spinal health support mattress system based on displacement sensing and motion capture includes at least six marker point sensors corresponding to the C1, C7, T4, T7, L4 and S vertebrae in the motion capture module. The inertial sensor is a nine-axis inertial measurement unit used to synchronously collect three-dimensional angle changes between vertebrae.

[0008] In the aforementioned spinal health support mattress system based on displacement sensing and motion capture, the data processing module uses the Z-Score normalization method to normalize the sagittal plane depth data and the baseline data, and then calculates the Z-mean value of the thoracic spine region and the Z-mean value of the lumbosacral spine region. When the Z-mean value of the thoracic spine region deviates from the baseline value by ±0.3 or the Z-mean value of the lumbosacral spine region deviates from the baseline value by ±0.47, the support adjustment command is triggered.

[0009] The aforementioned spinal health support mattress system based on displacement sensing and motion capture includes a support adjustment layer comprising at least three zones, corresponding to the cervical spine zone, thoracolumbar transition zone, and lumbosacral spine zone, respectively. Each zone is equipped with an independent airbag assembly or a variable firmness filling unit. The support adjustment module adjusts the firmness by controlling the air pressure or filling density of each zone.

[0010] The aforementioned spinal health support mattress system based on displacement sensing and motion capture has a support adjustment range for the thoracolumbar transition zone that is designed to accommodate gender differences. The length of the male zone is 38.63±11.26mm longer than that of the female zone, and the initial firmness of this zone is set higher than that of the cervical and lumbosacral zones.

[0011] The aforementioned spinal health support mattress system based on displacement sensing and motion capture also includes a detachable lumbar and hip padding layer in the support adjustment module. The lumbar and hip padding layer adopts a composite structure of latex and dynamic foam, and its thickness is controlled and adjusted within the range of 40-60mm by the data processing module. The lumbar and hip padding layer is detachably connected to the mattress body by Velcro or magnetic structure.

[0012] The aforementioned spinal health support mattress system based on displacement sensing and motion capture also includes a data processing module that stores a body parameter correlation model. This model is established based on the correlation data between height, shoulder width, weight, and spinal length. The correlation coefficient between the length of the spine (C1-S5) and height is 0.81, and the correlation coefficient with shoulder width is 0.63.

[0013] In the aforementioned spinal health support mattress system based on displacement sensing and motion capture, the motion capture module and the data processing module are connected wirelessly, the displacement sensing module is connected to the data processing module through a wired interface, and the data processing module displays the spinal morphology curve and the trend of intervertebral angle changes in real time.

[0014] Compared with existing technologies, this invention achieves real-time quantitative monitoring of spinal sagittal plane depth and intervertebral angles (coronal curvature and sagittal flexion-extension) through a combination of displacement sensing and multi-vertebral motion capture. This overcomes the shortcomings of traditional measurement methods, such as insufficient accuracy or radiation risks, and provides objective data for support optimization. Combining gender-specific parameters (such as the difference in T4-L4 segment length in men) and a body parameter correlation model (correlation between height, shoulder width, and spinal length), this invention achieves precise support for each individual through zoned adjustment and dynamic command generation, adapting to the spinal anatomy of different individuals. Based on Z-means (TZ, LZ) indicators, this invention judges the degree of spinal morphological deviation in real time and dynamically adjusts the hardness through a support adjustment module, ensuring that the Z-means of the thoracic and lumbar regions are closer to the natural standing posture benchmark under medium hardness, effectively maintaining the physiological curvature of the spine. This invention optimizes adjustment strategies for different needs in supine and lateral sleeping positions, reducing sagittal flexion-extension angles in supine positions and reducing coronal curvature angles in lateral sleeping positions, achieving spinal health protection in all sleeping positions. This invention employs a flexible adjustment unit (airbag, variable hardness filling) for gentle adjustment, balancing safety and comfort, and facilitating practical application. Attached Figure Description

[0015] Figure 1 This is an overall structural block diagram of the system of the present invention; Figure 2 This is a schematic diagram of vertebral body marking and positioning; Figure 3 This is a schematic diagram of the data collected by the displacement sensing module; Figure 4 This is a schematic diagram of the coronal plane curvature angle of the spine; Figure 5 This is a schematic diagram of the sagittal plane flexion-extension angle of the spine. Detailed Implementation

[0016] The present invention will be further described below with reference to the embodiments and accompanying drawings, but this should not be construed as limiting the present invention.

[0017] Example 1: A spinal health support mattress system based on displacement sensing and motion capture, comprising five core components: the mattress body, a displacement sensing module, a motion capture module, a data processing module, and a support adjustment module. These modules work collaboratively to achieve real-time monitoring of the supine spinal morphology and dynamic optimization of support performance. The overall system structure is as follows: Figure 1 As shown (a system structure diagram can be added here), the connection relationship between each part is as follows: the displacement sensing module and the motion capture module respectively collect spinal morphology data and transmit them to the data processing module for analysis; the data processing module generates support adjustment commands, controlling the support adjustment module to adjust the support firmness of the mattress body; the mattress body serves as the load-bearing foundation, and its internal support adjustment layer responds to the adjustment commands to achieve precise support. The specific structure and function of each module are described below: The mattress body has a multi-layered composite structure, including a surface fabric, a support and adjustment layer, and a bottom substrate. The surface fabric uses breathable and skin-friendly materials (such as bamboo fiber blend fabric) with a thickness of 5-10mm to ensure comfortable contact. The support and adjustment layer is the core functional layer, divided into three independent zones along the length of the mattress, corresponding to the cervical spine region (C1-C7), the thoracolumbar transition zone (T1-L4), and the lumbosacral region (L5-S5). Figure 2 As shown, Figure 2 Vertebral body markers were used for localization, with image a representing C1 (first cervical vertebra), image b representing C7 (seventh cervical vertebra), image c representing T4 (fourth thoracic vertebra), image d representing T7 (seventh thoracic vertebra), image e representing L4 (fourth lumbar vertebra), image f representing S (sacrum), and image g representing the human back. Each zone was separated by partitions, with dimensions designed according to human spinal anatomy (total length adapted to an adult height of 150-190cm). The bottom substrate used high-density sponge (density ≥40kg / m³) with a thickness of 20-30mm for stable support. Specifically, the length of the thoracolumbar transition zone was designed to account for gender differences: the male zone was 38.63±11.26mm longer than the female zone (based on measured data from 42 subjects, the average length of the T4-L4 segment in males was significantly greater than that in females), to accommodate the different spinal anatomy characteristics of the sexes.

[0018] The displacement sensing module is used to collect sagittal depth data of various measurement points of the spine in a supine position in real time, such as... Figure 3As shown, its structure and arrangement are as follows: Thirteen linear displacement sensors (model: Uni Measure PA-40-N20-D1S-10T) are selected, with a range of 0-40mm and an accuracy of ±0.1mm, meeting the measurement requirements for spinal depth changes. Arrangement: The sensors are equidistantly placed along the length of the mattress on the upper surface of the support adjustment layer, corresponding to the midline of the human spine. The spacing between adjacent sensors is 60mm (referencing the distribution pattern of spinal measurement points). The first sensor (Disp1) corresponds to the C1 vertebra, and the last sensor (Disp13) covers the sacral region (S point), ensuring complete acquisition of the spinal morphology from C1 to S5. The sensors are connected to the data processing module via a wired interface (USB 3.0), with a sampling rate of 500Hz to ensure the continuity of dynamic data. The core function of this module is to construct the sagittal plane curve of the spine through multi-point measurements, providing raw data for subsequent morphological analysis.

[0019] The motion capture module is used to collect intervertebral angle data of the spine (including coronal plane curvature angle and sagittal plane flexion-extension angle) to achieve three-dimensional quantification of spinal motion. The significance of the coronal plane curvature and sagittal plane flexion-extension indices is the difference between the intervertebral angles under the experimental posture and the calibrated posture (i.e., standing posture), that is: Spinal coronal plane curvature angle = intervertebral coronal plane curvature angle under the experimental sleeping posture (α1 / β1) - calibrated intervertebral angle (γ1) Figure 4 ); Sagittal flexion-extension angle of the spine = Sagittal flexion-extension angle between vertebrae in the experimental sleeping position (α2 / β2) - Angle between vertebrae at the calibrated position (γ2) Figure 5 Its structure is as follows: Six nine-axis inertial sensors (model: Xsens MVN Awinda) are selected, integrating a three-axis gyroscope, accelerometer, and magnetometer, with a sampling rate of 60Hz and an angle measurement accuracy of ±0.5°. The sensors are fixed to the landmark vertebrae of the human spine using medical tape, corresponding to the C1, C7, T4, L4, and S vertebrae respectively (the positioning method refers to anatomical standards: C7 is the most prominent spinous process when the head is lowered, T4 is located at the level of the line connecting the inner sides of the scapula, L4 corresponds to the horizontal line of the highest point of the iliac crest, and S is the most prominent point of the sacrum). Wireless Bluetooth communication (Bluetooth 5.0) is used to connect with the data processing module, with a transmission latency ≤100ms to ensure real-time performance. The core function of this module is to reflect the motion state of the spine under different sleeping postures and support conditions through changes in the angle between the vertebrae, supplementing the two-dimensional data limitations of the displacement sensing module.

[0020] The data processing module is the "brain" of the system, responsible for receiving and analyzing data and generating control commands. Its hardware uses an industrial-grade embedded computer (such as the NVIDIA Jetson Nano), and its software integrates the following core algorithms: Data preprocessing: The sagittal depth data from the displacement sensing module and the intervertebral angle data from the motion capture module are filtered (using the Kalman filter algorithm) to remove noise interference.

[0021] Spinal morphology compatibility analysis: The Z-Score normalization method was used to normalize the supine sagittal depth data and the standing baseline data (standing spinal morphology measurements from 42 healthy adults). The calculation formula is as follows: ; in: This is the original data; The mean of the dataset. This represents the standard deviation of the dataset. Number the measurement points.

[0022] Standardization eliminates baseline differences in sagittal depth of the spine among individual subjects and under different experimental conditions, thereby enabling direct lateral comparison of spinal morphology under different conditions—that is, cross-condition comparison. The standardized sagittal depth Z-value, fluctuating around zero, represents the degree of deviation between the supine and standing postures. Z = 0 indicates that the spinal morphology is completely consistent with the standing posture when supine; Z > 0 indicates that the sagittal depth of the spine is higher when supine than when standing; and Z < 0 indicates that it is lower than when standing. An ideal mattress should make the spinal morphology as close as possible to the standing posture when supine (Z ≈ 0), avoiding excessive local support or collapse.

[0023] The Z-mean values ​​for the thoracic and lumbosacral regions were constructed. During data analysis, the mean Z-values ​​for the thoracic and lumbosacral regions were obtained by processing supine spinal morphology data. These two parameters are composite curvature evaluation indicators based on standardized sagittal depth data and dynamic spinal segmentation, reflecting the overall direction and intensity of the thoracic and lumbar curvature offset relative to a natural standing posture. The mean Z-values ​​for the thoracic and lumbosacral regions were calculated by segmenting the thoracic and lumbosacral vertebrae of each subject's spine separately, and then weighting the Z-values ​​of the thoracic and lumbosacral regions for each subject. This approach can, to some extent, mitigate errors caused by gender differences in spinal segment length. Simultaneously, it effectively reflects the impact of mattress conditions of different firmness on the thoracic and lumbosacral regions.

[0024] The thoracic spine region Z-mean (TZ) reflects the standardized deviation of the curvature of the thoracic spine region (C7-T12) from the natural standing posture when the subject is supine. It is calculated by weighted averaging of the Z-scores from various measurement points in the thoracic spine region, using the following formula: ; in: For the first Z-score (standardized sagittal depth of the spine) at each measurement point; For indicator functions, when the first The value of point i is 1 when it is located in the thoracic spine region (C7-T12), and 0 otherwise.

[0025] The lumbosacral vertebral region Z-mean (LZ) characterizes the standardized change in curvature of the lumbosacral region (L1~S5) relative to the natural standing posture when the subject is supine. It is calculated by weighted averaging of Z-scores from measurement points in the lumbar region, using the following formula: ; in: For indicator functions, when the first The value is 1 when the point is located in the lumbar region (C7-T12), and 0 otherwise.

[0026] When the mean Z-score for the thoracic spine is positive, it indicates a decrease in thoracic kyphosis; a negative value indicates an increase in thoracic kyphosis and curvature. When the mean Z-score for the lumbosacral spine is positive, it indicates an increase in lumbar lordosis and curvature; a negative value indicates a straightening or reversal of the lumbar curvature and a decrease in lordosis. Therefore, when the mean Z-scores for both the thoracic and lumbosacral spine are close to 0, it means that the spinal curvature when lying supine is closer to the spinal state when standing naturally, and the mattress provides more ideal support for the spine.

[0027] Adjustment command generation: When TZ deviates from the reference value (0) ±0.3 or LZ deviates from the reference value ±0.47 (based on the experimentally verified threshold, at which point the spinal morphology significantly deviates from the natural curvature, leading to intervertebral disc pressure imbalance or causing lumbar suspension), a support adjustment command is triggered. The command includes the target zone, adjustment direction (increase / decrease stiffness), and adjustment range. Body parameter correlation model: Built-in correlation model of height, shoulder width, weight and spine length (correlation coefficient of C1-S5 spine length with height is 0.81, and correlation coefficient with shoulder width is 0.63), which can preset the initial support plan according to the user's body parameters.

[0028] The support adjustment module executes instructions from the data processing module to dynamically adjust the mattress support firmness. Its structure is as follows: Zoned adjustment unit: The cervical and lumbosacral regions use airbag components (made of TPU, 0.2mm thick), and the air pressure is adjusted by a micro air pump (flow rate 1L / min) (range 0.02-0.1MPa) to achieve continuous hardness adjustment; the thoracolumbar transition zone uses a variable hardness filling unit (a mesh structure woven from shape memory alloy wires, 0.5mm in diameter), and the stiffness of the alloy wires is changed by current control (0-5A) to achieve graded hardness adjustment (HS value 3-6, corresponding to the medium hardness range); Removable lumbar and hip padding layer: It adopts a composite structure of latex (70kg / m³) and dynamic sponge (70kg / m³), and the thickness can be controlled between 40-60mm through the data processing module (experiments have verified that the coronal plane curvature angle is reduced by 41.9%-55.4% when it is 60mm). It is connected to the mattress body through Velcro to enhance the local support of the soft mattress. Drive and control: Each zone adjustment unit is equipped with an independent drive module (air pump / current controller), which receives instructions from the data processing module via CAN bus, with a response time of ≤2s.

[0029] The working process of this system includes the following steps: Initialization: After the user lies down, the displacement sensing module and motion capture module are automatically activated to collect initial spinal morphology data (lasting 30 seconds, with the average value taken as the baseline). Real-time monitoring: The displacement sensing module collects sagittal plane depth data at 13 points per second, and the motion capture module collects intervertebral angle data at 6 vertebrae per second, which are transmitted to the data processing module in real time. Data Analysis: The data processing module calculates TZ and LZ values ​​every 5 seconds, and analyzes the changes in intervertebral angles (such as the sagittal flexion-extension angles of the T8-T9, T12-L1, and L3-L4 segments when supine). Dynamic adjustment: When the spinal shape is detected to deviate from the baseline range, the support adjustment module adjusts the firmness of the corresponding zone (e.g., in a medium firmness state, the mean Z-value of the thoracic spine is reduced by 32.4% compared to a firm mattress, and the mean Z-value of the lumbar spine is reduced by 72% compared to a soft mattress). Sleep position adaptation: Automatically switches adjustment strategies to meet different needs of supine / side sleeping (prioritizes optimization of sagittal flexion-extension angle when supine, and prioritizes reduction of coronal flexion angle when side sleeping).

[0030] Example 2: To make the objectives, technical solutions and effects of the present invention clearer, the system of Example 1 of the present invention will be described in detail below in conjunction with specific application scenarios.

[0031] I. System Composition and Parameter Configuration: This embodiment is designed for a 25-year-old male user (175cm tall, 68kg, BMI 22.2kg / m²). The specific configuration of each module of the system is as follows: Mattress body: Dimensions: 180cm (length) × 90cm (width) × 20cm (thickness), the surface fabric is bamboo fiber blended fabric (thickness 8mm), and the bottom substrate is high-density sponge (density 45kg / m³, thickness 25mm). The support and adjustment layer is divided into three zones: cervical spine zone (corresponding to C1-C7): 15cm in length, with an internal airbag assembly (500mL volume, TPU material); thoracolumbar transition zone (corresponding to T1-L4): 48cm in length (male-specific design, 38mm longer than the female standard), with an internal shape memory alloy mesh (0.5mm wire diameter, 20 mesh density); lumbosacral spine zone (corresponding to L5-S5): 22cm in length, with an internal airbag assembly (600mL volume, TPU material).

[0032] Displacement sensing module: Employs 13 Uni Measure PA-40-N20-D1S-10T linear displacement sensors with a range of 0-40mm and an accuracy of ±0.1mm; equidistantly arranged along the center line of the mattress with an adjacent spacing of 60mm. The first sensor (Disp1) is aligned with the user's C1 vertebra (the first cervical vertebra below the skull), and the last sensor (Disp13) covers the most prominent point of the sacrum (S point); connected to the data processing module via a USB 3.0 interface with a sampling rate of 500Hz.

[0033] Motion capture module: It uses 6 Xsens MVN Awinda nine-axis inertial sensors, which are fixed to the user's C1, C7, T4, T7, L4 and S vertebrae respectively (fixation method: medical tape is attached to the skin, and the sensor is aligned with the spinous process of the vertebra); the sampling rate is 60Hz, data is transmitted via Bluetooth 5.0, the angle measurement range is ±180°, and the accuracy is ±0.5°.

[0034] Data processing module: The hardware uses an NVIDIA Jetson Nano embedded computer (4GB memory, supporting real-time data processing).

[0035] Built-in algorithms include a Z-Score standardization module (based on the mean spinal morphology of 42 healthy adults in standing posture), a TZ / LZ calculation module (thoracic C7-T12, lumbosacral L1-S5), and an adjustment command generation module (trigger thresholds: TZ±0.3, LZ±0.47); and a pre-stored body parameter association model: based on a user height of 175cm, automatically matching a predicted spinal C1-S5 length of 658mm (reference height and spinal length correlation coefficient 0.81).

[0036] Support adjustment module: Cervical / lumbosacral region drive: micro air pump (model: FML-03, flow rate 1L / min, air pressure adjustment range 0.02-0.1MPa); Thoracolumbar transition zone drive: current controller (output 0-5A, controls shape memory alloy rigidity); Removable lumbar and hip padding layer: latex (70kg / m³) + dynamic sponge (70kg / m³) composite structure, thickness 60mm (experimentally verified as the optimal value), connected to the mattress body via Velcro.

[0037] II. Work Process (1) Initialization phase (when the user is lying supine); After the user lies down, the system automatically starts: the displacement sensing module collects the initial sagittal plane depth data (lasts for 30 seconds) and obtains the average depth of each point (e.g., C7 vertebral body corresponds to Disp2 depth of 28mm, L4 vertebral body corresponds to Disp9 depth of 32mm).

[0038] The motion capture module acquires the initial intervertebral angles (e.g., T8-T9 sagittal flexion-extension angle 1.2°, T12-L1 coronal flexion angle 0.3°); the data processing module compares the initial data with the standing posture reference and calculates TZ=0.2, LZ=0.1 (both within the normal range), and the system enters standby mode.

[0039] (2) Real-time monitoring and adjustment (when the user rolls over to lie on their right side); Data acquisition: The displacement sensing module detected an increase in the depth of the lumbosacral region (Disp10 depth increased from 32mm to 45mm), and the motion capture module measured that the coronal curvature angle of T12-L1 increased to -1.2° (negative value indicates bending to the right), and the angle of L3-L4 increased to -1.1°.

[0040] Data analysis: The data processing module calculated the mean Z-value of the thoracic spine region as TZ=-0.35 (lower than the baseline threshold of -0.3), indicating excessive kyphosis of the thoracic spine.

[0041] Adjustment command: Send a command to the chest and waist transition area, the current controller output current increases from 2A to 3A, the shape memory alloy rigidity is improved, and the waist and hip padding layer automatically fits (triggered by pressure sensor).

[0042] Adjustment effect: After 5 seconds, the motion capture module reported that the T12-L1 angle dropped to -0.4°, the L3-L4 angle dropped to -0.3°, and the TZ rose back to -0.28 (returning to the normal range).

[0043] (3) Optimization of sleeping position switching (when the user turns back to lying on their back).

[0044] The motion capture module detected changes in the sagittal flexion-extension angle (T8-T9 angle increased from 1.2° to 2.5°), exceeding the baseline value for a hard mattress (2.38°); the data processing module calculated the mean Z-value of the lumbar spine region LZ=0.5 (higher than the baseline threshold of 0.47), and determined that the lumbar spine was excessively lordotic.

[0045] Adjustment instructions: Reduce air pressure in the lumbosacral region (from 0.08MPa to 0.05MPa), soften the airbag.

[0046] Adjustment effect: After 3 seconds, the displacement sensing module showed that the depth of Disp9 corresponding to L4 vertebral body decreased from 32mm to 28mm, the T8-T9 angle decreased to 1.18° (optimal value for medium hardness), and LZ=0.07 (compliant with the benchmark).

[0047] III. Implementation Results: This embodiment achieves the following results through dynamic monitoring and adjustment: When lying supine, the sagittal flexion-extension angles of the T8-T9, T12-L1, and L3-L4 segments are reduced by 50.4% compared to a firm mattress, approaching the physiological values ​​of a natural standing posture; when lying on one's side, the coronal curvature angles of the T12-L1 and L3-L4 segments are reduced by 66.7% compared to a soft mattress, and the lumbar and hip padding layer reduces the L5-S1 angle by 55.4%; the gender-specific design of the thoracolumbar transition zone improves spinal fit for male users by 32%, eliminating any feeling of localized suspension. Therefore, this embodiment can accurately maintain the natural curvature of the spine under different sleeping positions, effectively reducing spinal pressure and achieving the goal of preventing spinal diseases.

[0048] In summary, this system, by integrating displacement sensing, motion capture, and intelligent adjustment technologies, solves the problem of the mismatch between the support performance of existing mattresses and the needs of spinal health, and provides a new technical solution for the prevention of spinal diseases.

Claims

1. A spinal health support mattress system based on displacement sensing and motion capture, characterized in that: include: The mattress body has an internal support and adjustment layer distributed along the corresponding area of ​​the spine; The displacement sensing module includes multiple linear displacement sensors, which are arranged along the length of the mattress on the surface of the mattress body at positions corresponding to the human spine, and are used to collect sagittal plane depth data of each measurement point of the spine in a lying position in real time. The motion capture module includes multiple inertial sensors, which are fixed at the vertebral body markers of the human spine to collect intervertebral angle data in real time. The data processing module is electrically connected to the displacement sensing module and the motion capture module, respectively, and is used to receive the sagittal plane depth data and intervertebral angle data, analyze the conformity between the spinal morphology and the reference standing posture, and generate support adjustment commands. The support adjustment module, electrically connected to the data processing module, is located within the support adjustment layer and is used to adjust the support firmness of the corresponding area of ​​the mattress according to the support adjustment command.

2. The spinal health support mattress system based on displacement sensing and motion capture according to claim 1, characterized in that: The displacement sensing module is equipped with 13 linear displacement sensors. The linear displacement sensors are arranged at equal intervals along the length of the mattress, with a spacing of 60mm between adjacent sensors. The first sensor corresponds to the position of the C1 vertebra in the human body, and the last sensor covers the sacral region.

3. The spinal health support mattress system based on displacement sensing and motion capture according to claim 1, characterized in that: The motion capture module's inertial sensors include at least six marker point sensors corresponding to the C1, C7, T4, T7, L4, and S vertebrae. The inertial sensors are nine-axis inertial measurement units used to synchronously acquire three-dimensional angle changes between the vertebrae.

4. The spinal health support mattress system based on displacement sensing and motion capture according to claim 1, characterized in that: The data processing module uses the Z-Score normalization method to normalize the sagittal depth data with the baseline data, and then calculates the Z-mean value of the thoracic spine region and the Z-mean value of the lumbosacral spine region. When the Z-mean value of the thoracic spine region deviates from the baseline value by ±0.3 or the Z-mean value of the lumbosacral spine region deviates from the baseline value by ±0.47, the support adjustment command is triggered.

5. The spinal health support mattress system based on displacement sensing and motion capture according to claim 1, characterized in that: The support adjustment layer includes at least three zones, corresponding to the cervical spine zone, thoracolumbar transition zone, and lumbosacral spine zone, respectively. Each zone is equipped with an independent airbag assembly or variable hardness filling unit. The support adjustment module adjusts the hardness by controlling the air pressure or filling density of each zone.

6. The spinal health support mattress system based on displacement sensing and motion capture according to claim 5, characterized in that: The support adjustment range of the thoracolumbar transition zone is set according to gender differences. The length of the male zone is 38.63±11.26mm longer than that of the female zone, and the initial hardness of this zone is set higher than that of the cervical and lumbosacral zones.

7. The spinal health support mattress system based on displacement sensing and motion capture according to claim 5, characterized in that: The support adjustment module also includes a detachable lumbar and hip padding layer. The lumbar and hip padding layer adopts a composite structure of latex and dynamic sponge. The thickness is controlled and adjusted within the range of 40-60mm by the data processing module. The lumbar and hip padding layer is detachably connected to the mattress body by Velcro or magnetic structure.

8. The spinal health support mattress system based on displacement sensing and motion capture according to claim 1, characterized in that: The data processing module also stores a body parameter correlation model, which is established based on the correlation data of height, shoulder width, weight and spine length. The correlation coefficient between the C1-S5 spine length and height is 0.81, and the correlation coefficient with shoulder width is 0.

63.

9. The spinal health support mattress system based on displacement sensing and motion capture according to claim 1, characterized in that, The motion capture module and the data processing module are connected wirelessly, and the displacement sensing module is connected to the data processing module via a wired interface. The data processing module displays the spinal morphology curve and the trend of intervertebral angle changes in real time.

Images