Spinal cord injury teaching model with sensory-motion plane visualization and voice guidance functions

Abstract

The invention relates to the technical field of medical education equipment, and discloses a spinal cord injury teaching model with sensory-motion plane visualization and voice guidance functions. Comprising a human body model body, a plurality of red light emitting diodes, a plurality of blue light emitting diodes, a plurality of micro steering engines, a key input module, a main controller, a voice synthesis module and a rechargeable power supply, when a spinal nerve segment, a body side and a muscle strength level are selected through the key input module, the main controller controls all red light-emitting diodes or blue light-emitting diodes, located on the spinal nerve segment and above the spinal nerve segment, in the selected body side to be turned on. And the control module is used for controlling the voice synthesis module to play voice contents corresponding to the selected spinal nerve segment, the selected body side and the selected muscle strength level, and driving the micro steering engine corresponding to the key movement muscle in the selected body side to rotate to a preset angle corresponding to the selected muscle strength level. The control module is used for controlling the voice synthesis module to play the voice contents corresponding to the selected spinal nerve segment, the body side and the muscle strength level.

Description

A spinal cord injury teaching model with sensory-motor plane visualization and voice guidance. Technical Field

[0001] This invention relates to the field of medical education equipment technology, specifically a spinal cord injury teaching model with sensory-motor plane visualization and voice guidance functions. Background Technology

[0002] Spinal cord injury is a severe injury to the central nervous system, and the assessment of the level of injury and the degree of preservation of neurological function is crucial for clinical diagnosis, treatment decisions, and prognosis. Currently, medical education on spinal cord injury primarily relies on static anatomical models, two-dimensional atlases, and limited clinical case explanations.

[0003] Existing spinal cord anatomical models typically only demonstrate the anatomical correspondence between spinal cord segments, spinal nerve roots, and body surface regions, lacking the ability to simulate dynamic functions and failing to present the correlation between the extent of sensory loss and motor dysfunction after injury to a specific segment. While two-dimensional atlases can mark the locations of key sensory and motor muscles, they lack three-dimensional spatial perception and interactive operation experiences. Clinical case teaching is limited by the number of cases, ethical requirements, and the uncontrollable nature of the condition, making it difficult to systematically and repeatedly demonstrate standardized neurological manifestations at different injury segments (such as C5, T6, L3, etc.) and different muscle strength grades (0-5).

[0004] Furthermore, the international standards developed by the American Spinal Cord Injury Association (ASIA) require pinprick and light touch scoring for 28 pairs of sensory key points and a 0-5 graded muscle strength assessment for 10 pairs of motor key muscles. However, existing teaching tools have not yet integrated sensory plane labeling, motor function simulation, and muscle strength grade reproduction into a unified function, nor are they equipped with a guidance mechanism synchronized with the assessment process, which makes it difficult for learners to master the ASIA standard operating logic.

[0005] Therefore, to solve the above problems, it is urgent to develop a special model that can dynamically simulate the changes in sensory-motor function after spinal cord injury, intuitively present muscle strength grading, and combine voice guidance to assist teaching. This model can help learners quickly establish the relationship between the injured segment, sensory plane, motor function, and muscle strength grade, thereby improving the intuitiveness, interactivity, and practicality of teaching. Summary of the Invention

[0006] (I) Technical Problems Solved In response to the shortcomings of existing technologies, this invention provides a spinal cord injury teaching model with sensory-motor plane visualization and voice guidance functions. It has the advantages of visualizing the linkage between sensory and motor functions, accurately simulating muscle strength grading, multimodal interactive guidance, simple and intuitive operation, and highly realistic appearance. It solves the problems of existing teaching tools, such as static display, inability to dynamically demonstrate joint movements under different muscle strength levels, lack of sensory-motor plane association presentation, lack of standardized voice guidance, and distortion of movement or lack of damping simulation.

[0007] (II) Technical Solution To achieve the aforementioned objectives of "visualization of sensory and motor function linkage and precise simulation of muscle strength grading," this invention provides the following technical solution: A spinal cord injury teaching model with sensory-motor plane visualization and voice guidance functions, comprising: a human body model, the surface of which is marked with 28 pairs of sensory key points and 10 pairs of motor key muscle test locations as defined by the American Spinal Cord Injury Association (ASIA) standards; multiple red light-emitting diodes, respectively embedded in the 28 pairs of sensory key points; multiple blue light-emitting diodes, respectively embedded in the 10 pairs of motor key muscle test locations; multiple micro-servos, respectively located at the joints corresponding to the 10 pairs of motor key muscle test locations, the output shaft of each micro-servo connected to a joint linkage mechanism; and a button input module, including a segment selection key, a left / right switch key, and keys from 0 to 5. The system includes: a muscle strength level selection button; a main controller electrically connected to the red LED, blue LED, micro servo motor, and button input module; a voice synthesis module electrically connected to the main controller; and a rechargeable power supply for powering the main controller, red LED, blue LED, micro servo motor, button input module, and voice synthesis module. When a spinal nerve segment, a body side, and a muscle strength level are selected via the button input module, the main controller illuminates all red or blue LEDs located at or above the selected spinal nerve segment in the selected body side, drives the micro servo motor of the corresponding key muscle in the selected body side to rotate to a preset angle corresponding to the selected muscle strength level, and simultaneously controls the voice synthesis module to play voice content corresponding to the selected spinal nerve segment, body side, and muscle strength level.

[0008] Preferably, the 10 pairs of key muscles for movement testing include: elbow flexors at segment C5, wrist extensors at segment C6, elbow extensors at segment C7, middle finger flexors at segment C8, little finger abductors at segment T1, hip flexors at segment L2, knee extensors at segment L3, ankle dorsiflexors at segment L4, big toe extensors at segment L5, and ankle plantarflexors at segment S1.

[0009] Preferably, the preset angles of the micro servo motor are as follows: 0° for level 0 muscle force; 0° for level 1 muscle force, and the micro servo motor performs periodic reciprocating oscillations within ±5° at a frequency of 1Hz to 2Hz under the control of the main controller; 30° to 45° for level 2 muscle force, and the motion trajectory of the joint linkage mechanism is limited to the horizontal plane; 60° to 90° for level 3 muscle force, and the motion trajectory of the joint linkage mechanism includes a vertical anti-gravity component; 90° for level 4 muscle force, and the joint linkage mechanism is connected to an adjustable damper; 90° for level 5 muscle force, and the joint linkage mechanism is not connected to a resistance device.

[0010] Preferably, the main controller is a microcontroller, which has multiple digital input / output pins that are electrically connected to the control terminals of each button, each red LED, each blue LED, and each micro servo motor of the button input module; the microcontroller is an STM32 series microcontroller or a control unit built on an Arduino Mega 2560 development board.

[0011] Preferably, the speech synthesis module includes a speech synthesis chip and a non-volatile memory. The non-volatile memory stores Chinese speech data corresponding to the combinations of spinal nerve segments, body sides, and muscle strength levels in the ASIA standard. A speaker is embedded in the shoulder area of ​​the human body model. The surface of the human body model has sound-transmitting holes corresponding to the speaker. The input end of the speech synthesis chip is electrically connected to the serial communication interface of the main controller, and the output end is connected to the speaker.

[0012] Preferably, the rechargeable power supply is a lithium polymer battery. The rechargeable power supply is connected to the main controller, light-emitting diode, micro servo motor, key input module and voice synthesis module through a power management circuit. The power management circuit integrates a Micro-USB charging interface and a power status indicator circuit.

[0013] Preferably, the human body model body is injection molded from engineering plastic, its surface is covered with a removable silicone skin layer, and an optical fiber layer is provided at the bottom; the light-emitting ends of the red light-emitting diode and the blue light-emitting diode pass through the optical fiber layer and out of the silicone skin layer to form visible light spots.

[0014] Preferably, the joint linkage mechanism includes a first link, a second link, and a rotating shaft. The first link is fixedly connected to the output shaft of the micro servo motor. One end of the second link is hinged to the end of the first link, and the other end is connected to the simulated limb component. The rotating shaft supports the second link and restricts its degree of freedom of motion to rotational motion in a single plane.

[0015] Preferably, the key input module further includes a reset button, one end of which is grounded and the other end is electrically connected to the reset pin of the main controller. When the reset button is pressed, the main controller is reset, all LEDs are turned off, the micro servo motor returns to its initial angle, and the voice synthesis module enters standby mode.

[0016] (III) Beneficial Effects Compared with the prior art, the present invention provides a spinal cord injury teaching model with sensory-motor plane visualization and voice guidance function, which has the following beneficial effects: 1. The present invention automatically lights up all sensory and motor key points LEDs of the selected spinal nerve segment and below through the main controller, intuitively presenting the clinical characteristics of "functional impairment below the injury plane", solving the problem that traditional static models cannot reflect the continuity of nerve function.

[0017] 2. This invention utilizes the coordinated control of a micro servo motor, a joint linkage mechanism, and an adjustable damper to realistically reproduce the range of motion, antigravity ability, and resistance response of muscle strength at various levels. In particular, it clearly distinguishes between level 3 (antigravity), level 4 (partial resistance), and level 5 (normal muscle strength), significantly improving the accuracy of muscle strength assessment teaching.

[0018] 3. This invention combines LED light (red LED / blue LED) indication, mechanical action demonstration and synchronous voice narration to achieve a three-in-one feedback of "visual-action-auditory", which helps learners quickly establish the connection between segments, key points and functions, lowers the learning threshold and enhances the immersive learning experience.

[0019] 4. This invention integrates all electronic components (main controller, power supply, voice module) and mechanical parts (servo motor, linkage, damper) under an engineering plastic shell and a silicone skin layer, with only the standard human body outline and key light-emitting points on the outside. This ensures both functional integrity and high simulation. The optical fiber layer ensures that the LED light points are evenly transmitted, avoiding glare or light leakage, which meets the professional aesthetic and usage requirements of medical teaching aids. Attached Figure Description

[0020] Figure 1 is a three-dimensional structural diagram of the spinal cord injury teaching model with sensory-motor plane visualization and voice guidance functions of the present invention; Figure 2 is a distribution diagram of sensory key points and motor key muscles drawn according to the American Spinal Cord Injury Association (ASIA) standard, where a is a schematic diagram of the back of the human body model, b is a schematic diagram of the front of the human body model, and c is a side view of the human body model; Figure 3 is a block diagram of the electronic system connection of the present invention; Figure 4 is a partial schematic diagram of the joint linkage mechanism of the present invention; Figure 5 is a sectional view of the human body model of the present invention; Figure 6 is an enlarged view of the structure at point A in Figure 1 of the present invention; Figure 7 is a schematic diagram of the muscle strength grading and movement comparison of the present invention; Figure 8 is a comparison table of ASIA standard segments and functions of the present invention; Figure 9 is a comparison table of ASIA standard segments and functions of the present invention.

[0021] In the diagram: 1. Human body model body; 11. Silicone skin layer; 12. Optical fiber layer; 2. Red light-emitting diode; 3. Blue light-emitting diode; 4. Miniature servo motor; 5. Joint linkage mechanism; 51. First link; 52. Second link; 53. Rotating shaft; 6. Button input module; 7. Main controller; 8. Speech synthesis module; 81. Speech synthesis chip; 82. Non-volatile memory; 83. Speaker; 84. Sound transmission hole; 9. Rechargeable power supply. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] As shown in Figures 1-7, a spinal cord injury teaching model with sensory-motor plane visualization and voice guidance functions includes: a human body model 1, the surface of which is marked with 28 pairs of sensory key points and 10 pairs of motor key muscle test positions as defined by the American Spinal Cord Injury Association (ASIA) standards; multiple red LEDs 2, which are embedded in the 28 pairs of sensory key points; multiple blue LEDs 3, which are embedded in the 10 pairs of motor key muscle test positions; multiple micro servos 4, which are respectively set at the joints corresponding to the 10 pairs of motor key muscle test positions, and the output shaft of each micro servo 4 is connected to a joint linkage mechanism 5; a button input module 6, including a segment selection key, a left / right switching key, and a muscle strength level selection key from 0 to 5; and a main controller 7, which is connected to the red LEDs. 2. Blue LED 3, micro servo motor 4, and key input module 6 are electrically connected; voice synthesis module 8 is electrically connected to main controller 7; rechargeable power supply 9 supplies power to main controller 7, red LED 2, blue LED 3, micro servo motor 4, key input module 6, and voice synthesis module 8; wherein, when a spinal nerve segment, a body side, and a muscle strength level are selected through key input module 6, main controller 7 controls all red LEDs 2 or blue LEDs 3 located at or above the selected spinal nerve segment in the selected body side to light up, and drives the micro servo motor 4 of the corresponding key muscle in the selected body side to rotate to a preset angle corresponding to the selected muscle strength level, while controlling voice synthesis module 8 to play the voice content corresponding to the selected spinal nerve segment, body side, and muscle strength level.

[0024] In this embodiment, the spinal cord injury teaching model with sensory-motor plane visualization and voice guidance functions is composed of the above-mentioned components, forming a highly integrated, intuitive, and clinically compliant teaching system. The human body model 1 serves as the overall structural carrier, with an internal cavity to accommodate the main controller 7, rechargeable power supply 9, and voice synthesis module 8. All micro servos 4 and joint linkage mechanisms 5 are embedded in the corresponding limb joints, with only the natural human outline and key light points retained externally to ensure realistic appearance and immersive teaching. After the user completes parameter settings through the button input module 6, the main controller 7 executes a triple feedback of light indication, mechanical action, and voice broadcast according to the pre-stored ASIA standard logic. This realistically reproduces the dynamic performance of the range of sensory loss, motor function preservation status, and corresponding muscle strength level under a specific spinal cord injury segment, thereby effectively solving the technical defects of traditional teaching tools that are static, abstract, and lack interactivity. This significantly improves the understanding and practical ability of medical students, rehabilitation therapists, and related medical personnel in assessing the neurological function of spinal cord injury.

[0025] As shown in Figures 1 and 6, the human body model body 1 is injection molded from engineering plastic, and its surface is covered with a removable silicone skin layer 11. An optical fiber layer 12 is provided at the bottom. The light-emitting ends of the red light-emitting diode 2 and the blue light-emitting diode 3 pass through the optical fiber layer 12 and emerge from the silicone skin layer 11 to form visible light spots.

[0026] In this embodiment, the structural design allows the light emitted by the red LED 2 and the blue LED 3 to be uniformly conducted through the optical fiber layer 12 and softly transmitted through the surface of the silicone skin layer 11, which avoids direct glare and ensures that the light spots of the 28 pairs of sensory key points and 10 pairs of motor key muscle positions are clear and have distinct boundaries. At the same time, the silicone skin layer 11 is removable, which facilitates the maintenance of internal electronic components, while the engineering plastic body provides high-strength support, taking into account the model's simulation, durability and functionality.

[0027] As shown in Figure 4, the joint linkage mechanism 5 includes a first link 51, a second link 52, and a rotating shaft 53. The first link 51 is fixedly connected to the output shaft of the micro servo motor 4. One end of the second link 52 is hinged to the end of the first link 51 via a pin to form a rotating pair, and the other end is rigidly connected to a simulated limb component (such as a forearm or lower leg). The rotating shaft 53 is a fixed shaft that runs laterally through the elbow or knee joint area. Its two ends are firmly embedded in the left and right side shell support structures of the human body model 1 at the joint. The second link 52 has a through hole in the middle and is sleeved on the outer surface of the rotating shaft 53, forming a rotatable but not... The mechanism features axially movable coordination. During operation, the micro servo motor 4 outputs rotational motion, which is converted into a push-pull action via the first link 51. This drives the second link 52 to swing around the axis 53 in the sagittal plane, thereby causing the simulated limb to complete flexion and extension movements. Since the axis 53 is fixed and restricts the degree of freedom of the second link 52, the entire mechanism only allows physiological trajectory movement in a single plane, effectively avoiding non-anatomical swaying or deviation. This design is not only compact and precise in motion, but also accurately reproduces the movement direction and range of each key muscle in the ASIA standard, significantly improving the motion simulation and evaluation reliability of the teaching model.

[0028] As shown in Figure 7, the preset angles of the micro servo motor 4 are as follows: the preset angle corresponding to level 0 muscle force is 0°; the preset angle corresponding to level 1 muscle force is 0°, and the micro servo motor 4, under the control of the main controller 7, performs periodic reciprocating oscillations within a range of ±5° at a frequency of 1Hz to 2Hz; the preset angle corresponding to level 2 muscle force is 30° to 45°, and the motion trajectory of the joint linkage mechanism 5 is limited to the horizontal plane; the preset angle corresponding to level 3 muscle force is 60° to 90° (adapted according to the physiological range of motion of different key muscles), and the motion trajectory of the joint linkage mechanism 5 includes a vertical anti-gravity component; the preset angle corresponding to level 4 muscle force is 90°, and the joint linkage mechanism 5 is connected to an adjustable damper; the preset angle corresponding to level 5 muscle force is 90°, and the joint linkage mechanism 5 is not connected to a resistance device.

[0029] The above-mentioned muscle strength grading control strategy is strictly formulated in accordance with the international standards of the American Spinal Cord Injury Association (ASIA) and is highly consistent with actual clinical functional performance. In order to clarify the sensory and motor assessment content corresponding to each spinal nerve segment, this invention further refers to the ASIA standard and constructs the "ASIA Standard Segment-Function Comparison Table" as shown in Figures 8 and 9. The attached figures show that the system defines the location, function and normal performance of 5-level muscle strength of 28 pairs of sensory key points and 10 pairs of motor key muscles from C2 to S4–S5, providing accurate anatomical and functional basis for the LED indication, servo drive logic and voice prompt content in the model.

[0030] As shown in Figures 8 and 9, where: 1. C5, C6, C7, C8, T1, L2, L3, L4, L5, S1 indicate that the segment has both sensory key points and motor key muscles, totaling 10 motor segments; 2. "—" indicates that the segment has no designated motor key muscles (only used for sensory assessment).

[0031] 3. Although there are sensory points in segments such as L1 and S2–S5, they are not included in the motor score.

[0032] 4. All sensory points are bilaterally symmetrical and need to be evaluated separately for the left and right sides.

[0033] As shown in Figure 3, the main controller 7 uses a microcontroller with multi-channel digital input / output capabilities to coordinate the perception, driving, and interaction functions of the entire teaching model. The main controller 7 has a built-in program memory to store the ASIA standard segment-muscle force mapping table, LED control logic, and servo angle parameters. The microcontroller connects to the control signal terminals of each function button of the button input module 6, all red LEDs 2, blue LEDs 3, and each micro servo 4 through its multiple I / O pins, realizing real-time response to user operations, precise lighting of key point lights, accurate driving of joint movements, and synchronous control between multiple modules. A high-performance STM32 series microcontroller or a control unit built based on the Arduino Mega 2560 development board can be selected. Both have sufficient I / O resources, stable PWM output capabilities, and good program scalability, and can efficiently execute the segment-muscle force mapping logic under the ASIA standard, ensuring reliable model operation, rapid response, and complete functionality.

[0034] As shown in Figure 5, the speech synthesis module 8 consists of a speech synthesis chip 81, a non-volatile memory 82, a speaker 83, and a sound-transmitting structure, used to provide standardized speech guidance synchronized with the ASIA assessment content. The non-volatile memory 82 pre-stores complete Chinese speech data packages covering all spinal nerve segments (C2–S1), left and right body sides, and muscle strength levels 0–5, such as clinically standardized expressions like "left C6 segment, level 4 muscle strength, wrist extensor muscles can complete the full range of motion against partial resistance." The speech synthesis chip 81 receives instructions from the main controller 7 via a serial communication interface (such as UART), retrieves the corresponding speech segment from the memory based on the currently selected segment, side, and muscle strength level, performs digital-to-analog conversion and audio amplification, and drives the miniature speaker 83 embedded in the shoulder cavity of the human model body 1 to produce sound. To ensure clear sound transmission without affecting the model's appearance, the human model body 1 has a micro-pore array of sound-transmitting holes 84 in the skin layer directly in front of the speaker 83, ensuring effective sound wave radiation while maintaining the integrity of the surface simulation.

[0035] As shown in Figures 3 and 5, the rechargeable power supply 9 uses a high-energy-density lithium polymer battery as the sole power supply unit for the entire system. Through an integrated power management circuit, it provides stable and safe DC power to all electronic components, including the main controller 7, red LED 2, blue LED 3, micro servo motor 4, key input module 6, and voice synthesis module 8. This power management circuit not only has overcharge, over-discharge, short-circuit, and overcurrent protection functions, but also integrates a Micro-USB charging interface, supporting convenient charging via a 5V standard adapter or computer USB port. Simultaneously, the circuit includes a power status indicator circuit, which can read the remaining power through LEDs or the main controller 7 and trigger a prompt when the power is low (such as a voice announcement "Low power, please charge"), preventing accidental power outages during teaching.

[0036] As shown in Figure 1, in addition to the segment selection key, left / right switch key, and 0 to 5 muscle strength level selection key, the key input module 6 also includes a reset key for quickly restoring the system to its initial standby state. One end of the reset key is grounded, and the other end is connected to the hardware reset pin (such as NRST or RESET) of the main controller 7, forming a low-level active reset circuit. When the user presses the reset key, the main controller 7 is immediately forced to restart and then executes the initialization program: all red LEDs 2 and blue LEDs 3 are turned off, each micro servo motor 4 drives the joint linkage mechanism 5 to rotate to the 0° initial position (i.e., the limb is fully extended), the voice synthesis module 8 stops the current broadcast and enters the silent standby mode, and the entire system returns to the default idle state after power-on.

[0037] In this embodiment, the working principle of the spinal cord injury teaching model with sensory-motor plane visualization and voice guidance functions includes the following:

[0038] After the user selects the target spinal nerve segment (e.g., C6), body side (left / right), and muscle strength level (0–5) via the button input module 6, the main controller 7 immediately calls the ASIA standard logic mapping table pre-stored in the program to perform a triple synchronous operation: First, it illuminates the red LEDs 2 of the corresponding sensory key points and / or the blue LEDs 3 of the motor key points of the selected side segment and above, thereby determining that the segment is the lowest plane of functional preservation, and the segments below it are unlit, indicating the area of ​​functional loss; Second, it drives the micro servo motor 4 of the joint where the corresponding motor key muscle is located to rotate to a preset angle matching the selected muscle strength level—for example, 0° (no movement), vibration. (Muscle contraction), 30°–45° (horizontal swing), 60°–90° (anti-gravity lifting), and at level 4, the adjustable damper is activated to simulate resistance, and at level 5, it remains unobstructed; at the same time, the main controller 7 sends instructions to the speech synthesis module (8) to play standardized Chinese voice prompts that are completely consistent with the current settings, such as "Right L3 segment, level 3 muscle strength, knee extensor muscle can complete the full range of activities against gravity"; the whole process is completed within 1–2 seconds, realizing an immersive teaching experience of "one-click trigger, light-motion-sound linkage"; the system is continuously powered by the rechargeable power supply 9 and runs stably; if a re-demonstration is required, the user can press the reset button at any time to make the model quickly return to the initial state. This workflow highly restores the real scene of clinical ASIA assessment, effectively solves the core pain points of abstract, static and lack of interaction in traditional teaching, and significantly improves learners' understanding of the depth of understanding and practical ability of spinal cord injury neurological function localization and grading.

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A spinal cord injury teaching model with sensory-motor plane visualization and voice guidance functions, characterized in that: include: The human body model (1) has 28 pairs of sensory key points and 10 pairs of motor key muscle test positions marked on its surface according to the American Spinal Cord Injury Association (ASIA) standards; multiple red light-emitting diodes (2) are embedded in the 28 pairs of sensory key points; multiple blue light-emitting diodes (3) are embedded in the 10 pairs of motor key muscle test positions; multiple micro servos (4) are respectively set at the joints corresponding to the 10 pairs of motor key muscle test positions, and the output shaft of each micro servo (4) is connected to a joint linkage mechanism (5); a key input module (6) includes a segment selection key, a left / right switching key, and a 0 to 5 level muscle strength selection key; a main controller (7) is connected to the red light-emitting diodes (2), blue light-emitting diodes (3), micro servos (4), and key input module (6). Electrical connection; speech synthesis module (8), electrically connected to the main controller (7); rechargeable power supply (9), powering the main controller (7), red light-emitting diode (2), blue light-emitting diode (3), micro servo motor (4), key input module (6) and speech synthesis module (8); wherein, when a spinal nerve segment, a body side and a muscle strength level are selected through the key input module (6), the main controller (7) controls all red light-emitting diodes (2) or blue light-emitting diodes (3) located in the selected body side at or above the spinal nerve segment to light up, and drives the micro servo motor (4) of the corresponding key muscle in the selected body side to rotate to a preset angle corresponding to the selected muscle strength level, and at the same time controls the speech synthesis module (8) to play the speech content corresponding to the selected spinal nerve segment, body side and muscle strength level.

2. The spinal cord injury teaching model with sensory-motor plane visualization and voice guidance function according to claim 1, characterized in that: The 10 pairs of key muscles for movement testing include: elbow flexors in segment C5, wrist extensors in segment C6, elbow extensors in segment C7, middle finger flexors in segment C8, little finger abductors in segment T1, hip flexors in segment L2, knee extensors in segment L3, ankle dorsiflexors in segment L4, big toe extensors in segment L5, and ankle plantar flexors in segment S1.

3. The spinal cord injury teaching model with sensory-motor plane visualization and voice guidance function according to claim 1, characterized in that: The preset angles of the micro servo motor (4) are as follows: the preset angle corresponding to level 0 muscle strength is 0°; the preset angle corresponding to level 1 muscle strength is 0°, and the micro servo motor (4) performs periodic reciprocating oscillations within a range of ±5° at a frequency of 1Hz to 2Hz under the control of the main controller (7); the preset angle corresponding to level 2 muscle strength is 30° to 45°, and the motion trajectory of the joint linkage mechanism (5) is limited to the horizontal plane; the preset angle corresponding to level 3 muscle strength is 60° to 90°, and the motion trajectory of the joint linkage mechanism (5) includes a vertical anti-gravity component; the preset angle corresponding to level 4 muscle strength is 90°, and the joint linkage mechanism (5) is connected to an adjustable damper; the preset angle corresponding to level 5 muscle strength is 90°, and the joint linkage mechanism (5) is not connected to a resistance device.

4. A spinal cord injury teaching model with sensory-motor plane visualization and voice guidance function according to claim 1, characterized in that: The main controller (7) is a microcontroller with multiple digital input / output pins, which are electrically connected to the control terminals of each button, each red LED (2), each blue LED (3), and each micro servo motor (4) of the button input module (6); the microcontroller is an STM32 series microcontroller or a control unit built on the Arduino Mega 2560 development board.

5. A spinal cord injury teaching model with sensory-motor plane visualization and voice guidance function according to claim 1, characterized in that: The speech synthesis module (8) includes a speech synthesis chip (81) and a non-volatile memory (82). The non-volatile memory (82) stores Chinese speech data corresponding to the combination of spinal nerve segments, body sides and muscle strength levels in the ASIA standard. A speaker (83) is embedded in the shoulder area of ​​the human body model (1). The surface of the human body model (1) is provided with a sound-transmitting hole (84) corresponding to the speaker (83). The input end of the speech synthesis chip (81) is electrically connected to the serial communication interface of the main controller (7), and the output end is connected to the speaker (83).

6. A spinal cord injury teaching model with sensory-motor plane visualization and voice guidance function according to claim 1, characterized in that: The rechargeable power supply (9) is a lithium polymer battery. The rechargeable power supply (9) is connected to the main controller (7), light-emitting diode, micro servo motor (4), key input module (6) and voice synthesis module (8) respectively through the power management circuit. The power management circuit integrates a Micro-USB charging interface and a power status indicator circuit.

7. A spinal cord injury teaching model with sensory-motor plane visualization and voice guidance function according to claim 1, characterized in that: The human body model body (1) is injection molded from engineering plastic, and its surface is covered with a removable silicone skin layer (11), and an optical fiber layer (12) is provided at the bottom; the light-emitting ends of the red light-emitting diode (2) and the blue light-emitting diode (3) pass through the optical fiber layer (12) and out of the silicone skin layer (11) to form visible light spots.

8. A spinal cord injury teaching model with sensory-motor plane visualization and voice guidance function according to claim 1, characterized in that: The joint linkage mechanism (5) includes a first link (51), a second link (52) and a rotating shaft (53). The first link (51) is fixedly connected to the output shaft of the micro servo motor (4). One end of the second link (52) is hinged to the end of the first link (51), and the other end is connected to the simulated limb component. The rotating shaft (53) supports the second link (52) and restricts its degree of freedom of motion to rotational motion in a single plane.

9. A spinal cord injury teaching model with sensory-motor plane visualization and voice guidance function according to claim 1, characterized in that: The key input module (6) also includes a reset button. One end of the reset button is grounded and the other end is electrically connected to the reset pin of the main controller (7). When the reset button is pressed, the main controller (7) is reset, all LEDs are turned off, the micro servo motor (4) returns to the initial angle, and the voice synthesis module (8) enters the standby state.

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