A synchronous beat driving circuit for gait rehabilitation training

Abstract

The utility model discloses a kind of synchronous beat driving circuit for gait rehabilitation training, comprising: gait signal detection and shaping circuit, for accessing gait sensor and collecting and obtaining corresponding gait trigger pulse with user pace;Adjustable reference pulse generating circuit, comprising: 555 time base chip, the 6th pin of 555 time base chip is connected with 7th pin and is grounded through first capacitor, 7th pin is also connected to power potential through adjustable resistance;Vibration driving circuit, the output end of adjustable reference pulse generating circuit is connected to its input end, for converting reference pulse signal into tactile vibration signal;Wherein, after 555 time base chip receives gait trigger pulse, a new 555 time base timing cycle will be started, and the next reference pulse signal is generated after timing time T ends, and vibration driving circuit is triggered.The utility model can effectively adjust step frequency, and can set the fast and slow of step frequency according to actual demand.

Description

Technical Field

[0001] This utility model belongs to the field of circuits, specifically relating to a synchronous beat drive circuit for gait rehabilitation training. Background Technology

[0002] With the fast pace of life and the challenges of an aging population, health problems such as foot diseases, osteoarthritis, neurological disorders, and diabetes are on the rise, often accompanied by abnormal gait changes. Gait abnormalities are not only early warning signs of many diseases but also have a significant impact on an individual's daily life and quality of life, leading to the development of gait sensors specifically for the elderly.

[0003] The liquid metal PDMS porous sponge TENG gait sensing unit generates alternating charge output through changes in foot pressure, and its signal is characterized by random pulse amplitude and large noise interference.

[0004] For example, Chinese patent CN202511433084.2 discloses a gait sensing unit based on a triboelectric nanogenerator made of liquid metal / PDMS porous sponge and its preparation method. This patent discloses a gait sensor and its preparation method.

[0005] Currently, there are relatively few gait sensors and their corresponding applications, especially in gait rehabilitation training. Existing technologies lack the relevant techniques to guide rehabilitation walking training using gait sensors. Utility Model Content

[0006] To address some technical problems existing in the prior art, this invention proposes a synchronous beat drive circuit for gait rehabilitation training. It aims to collect walking signals based on gait sensors and guide rehabilitation personnel to adjust their walking frequency, avoiding excessively fast or slow walking speeds, thereby providing guidance and training for walking rehabilitation. This invention can effectively adjust the step frequency, allowing for settings based on actual needs. This invention provides a synchronous beat drive circuit based on pure hardware circuitry that can dynamically adapt to the patient's gait. The circuit has a simple structure, low cost, good real-time performance, and is entirely implemented using hardware logic.

[0007] To achieve the above objectives, this utility model provides a synchronous beat drive circuit for gait rehabilitation training, comprising:

[0008] A gait signal detection and shaping circuit is used to connect to a gait sensor and acquire gait trigger pulses corresponding to the user's steps; the gait signal detection and shaping circuit includes a voltage comparator, the non-inverting input of the voltage comparator is connected to the output signal of the gait sensor, and the inverting input of the voltage comparator is connected to a reference potential;

[0009] An adjustable reference pulse generation circuit is provided, the trigger input of which is connected to the output of the gait signal detection and shaping circuit. The adjustable reference pulse generation circuit includes a 555 timer chip, pins 6 and 7 of which are connected and grounded through a first capacitor. Pin 7 is also connected to the power supply potential through an adjustable resistor.

[0010] A vibration drive circuit, the input of which is connected to the output of the adjustable reference pulse generator circuit, is used to convert the reference pulse signal into a tactile vibration signal;

[0011] When the 555 time base chip receives the gait trigger pulse, it starts a new 555 time base timing cycle, and after the timing time T ends, it generates the next reference pulse signal and triggers the vibration drive circuit.

[0012] Preferably, the adjustable reference pulse generating circuit is a retriggable monostable multivibrator. When a gait trigger pulse is received again within its timing period T, the current timing will be terminated and a new timing period of T will be immediately restarted.

[0013] Preferably, the timing time T of the retriggable monostable trigger is determined by an external resistor and capacitor connected to it, and the timing time T is continuously adjustable in the range of 0.5 seconds to 2.5 seconds.

[0014] For illustration purposes, the capacitor is 10uF and the adjustable resistor has a full-scale range of 500kΩ.

[0015] Preferably, the gait signal detection and shaping circuit includes a Schmitt trigger for shaping the signal from the gait sensor, eliminating jitter, and outputting a standard gait trigger pulse.

[0016] Preferably, the vibration drive circuit includes a switching transistor and a vibration motor, wherein the control electrode of the switching transistor receives the reference pulse signal to control the on / off state of the power supply circuit of the vibration motor.

[0017] Preferably, the circuit further includes a status indicator circuit, which is connected to the output terminal of the adjustable reference pulse generator circuit and is used to indicate the generation of the reference pulse signal by turning an LED indicator on or off.

[0018] Preferably, the circuit is integrated into a wearable device.

[0019] Preferably, the wearable device is a foot protector, insole, or a garment worn around the ankle.

[0020] Compared with existing technologies, this utility model has the following significant advantages: 1) The core of this utility model is that the guiding beat (reference pulse) is not generated at a fixed frequency, but is generated after a delay T from the previous actual gait. This allows the guiding signal to closely match the patient's real-time gait cycle, achieving true "step frequency following" rather than "forced synchronization." 2) By adopting a "retrievable monostable trigger," the circuit can perfectly handle "preemptive stepping" and "delayed stepping" situations. Preemptive stepping immediately resets the timing cycle, while delayed stepping waits, and the entire process conforms to the natural laws of human movement. 3) The entire solution consists of analog and digital logic circuits, without any microcontrollers or programs, resulting in low cost, high reliability, and full compliance with the provisions of utility model patents regarding the protection of subject matter. 4) Simple structure and easy implementation: The circuit components are common and inexpensive, easily integrated into various wearable rehabilitation devices, making it very suitable for widespread adoption. 5) Guidance is provided through tactile vibration, unaffected by environmental noise, offering good privacy and providing patients with an intuitive and comfortable rehabilitation training experience. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall principle of the synchronous beat drive circuit according to a specific embodiment of the present invention. Detailed Implementation

[0022] The embodiments of this patent are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this patent, and should not be construed as limiting this patent.

[0023] Example 1

[0024] The first embodiment of the present invention provides a synchronous beat drive circuit for gait rehabilitation training, characterized in that it includes:

[0025] A gait signal detection and shaping circuit is used to connect to a gait sensor and acquire gait trigger pulses corresponding to the user's steps; the gait signal detection and shaping circuit includes a voltage comparator, the non-inverting input of the voltage comparator is connected to the output signal of the gait sensor, and the inverting input of the voltage comparator is connected to a reference potential;

[0026] An adjustable reference pulse generation circuit is provided, the trigger input of which is connected to the output of the gait signal detection and shaping circuit. The adjustable reference pulse generation circuit includes a 555 timer chip, pins 6 and 7 of which are connected and grounded through a first capacitor. Pin 7 is also connected to the power supply potential through an adjustable resistor.

[0027] A vibration drive circuit, the input of which is connected to the output of the adjustable reference pulse generator circuit, is used to convert the reference pulse signal into a tactile vibration signal;

[0028] When the 555 time base chip receives the gait trigger pulse, it starts a new 555 time base timing cycle, and after the timing time T ends, it generates the next reference pulse signal and triggers the vibration drive circuit.

[0029] In this embodiment, the adjustable reference pulse generating circuit is a retriggable monostable multivibrator.

[0030] When a gait trigger pulse is received again within its timing period T, the current timing will be terminated and a new timing period of T will be started immediately.

[0031] It is worth mentioning that the timing time T of the retriggable monostable trigger is determined by the external resistor and capacitor connected to it, and the timing time T is continuously adjustable in the range of 0.5 seconds to 2.5 seconds.

[0032] This invention does not limit the specific values ​​of the capacitor and the adjustable resistor corresponding to the beat period. For illustration purposes, the capacitor is 10uF and the full scale range of the adjustable resistor is 500kΩ.

[0033] Optionally, the gait signal detection and shaping circuit includes a Schmitt trigger for shaping the signal from the gait sensor, eliminating jitter, and outputting a standard gait trigger pulse.

[0034] In this embodiment, the vibration drive circuit includes a switching transistor and a vibration motor. The control electrode of the switching transistor receives the reference pulse signal to control the on / off state of the power supply circuit of the vibration motor.

[0035] In this embodiment, the circuit further includes a status indicator circuit, which is connected to the output terminal of the adjustable reference pulse generator circuit and is used to indicate the generation of the reference pulse signal by turning the LED indicator on and off.

[0036] Optionally, the circuit is integrated into a wearable device.

[0037] Optionally, the wearable device may be a foot brace, insole, or a garment worn around the ankle.

[0038] The overall circuit workflow is as follows:

[0039] Each step taken by the user is detected by a gait sensor and converted into a gait trigger pulse. This pulse triggers an adjustable reference pulse generator circuit to begin a timer of period T. After the timer ends, the circuit outputs a reference pulse, which causes a vibration motor to vibrate once via a vibration drive circuit, indicating to the user that it is the ideal time to take the next step. If the user takes the next step before the timer ends (prematurely), a new gait trigger pulse resets the timer and immediately begins a new cycle. If the user delays taking a step, the circuit waits until the next step occurs.

[0040] Circuit implementation details:

[0041] Gait signal detection and shaping circuit: An LM393 voltage comparator chip can be used. Connect its inverting input to a reference voltage (e.g., 1.5V) obtained by potentiometer voltage division, and connect the non-inverting input to the signal from a gait sensor (e.g., a pressure sensor). When the pressure signal exceeds the reference voltage, the output is high, forming a gait trigger pulse. To eliminate jitter, a simple filter circuit consisting of resistors and capacitors can be added to the output, or a Schmitt trigger chip such as a 74HC14 can be used directly.

[0042] Adjustable reference pulse generation circuit: This is the core circuit. It uses an NE555 timer connected in a retrievable monostable mode. Its TRIG pin (pin 2) receives the gait trigger pulse. Whenever a negative pulse triggers, its output (pin 3) generates a high level for a duration T ≈ 1.1 * R_T * C_T. Here, R_T is an adjustable potentiometer (e.g., 500kΩ), and C_T is a fixed capacitor (e.g., 10μF). By adjusting R_T, T can be varied from 0.5s to 2.5s. The NE555 itself has a retrievable characteristic; during the high-level output period (i.e., during timing), if the TRIG pin receives another trigger pulse, the timer will immediately reset and restart timing T from that moment.

[0043] Vibration drive circuit: Uses an N-channel MOSFET (e.g., 2N7002). Its gate is connected to the output terminal (pin 3) of the NE555 through a current-limiting resistor (e.g., 1kΩ). The source is grounded, and the drain is connected to the negative terminal of the vibration motor (e.g., a 3V DC motor). The positive terminal of the vibration motor is connected to the power supply VCC. When the NE555 outputs a high level, the MOSFET is turned on, and the vibration motor is powered on and vibrates; when the output is low, the motor stops.

[0044] Status indicator circuit (optional): Connect an LED and a current-limiting resistor (e.g., 220Ω) in series between the output (pin 3) of the NE555 and ground. The LED will light up when the output is high and generates a reference pulse, providing visual feedback to the therapist.

[0045] The working principle of this utility model:

[0046] Suppose the therapist sets the timing T to 1 second. When the patient takes the first step, a gait trigger pulse is generated, initiating the NE555's 1-second timing. After 1 second, the NE555 outputs a high-level pulse, causing the vibration motor to vibrate once, prompting the patient to take the second step.

[0047] If the patient happens to take a step at this moment, a new trigger pulse will start the next 1-second cycle.

[0048] If the patient takes the second step (preemptive strike) at 0.8 seconds, the new trigger pulse will immediately reset the NE555, starting a new 1-second timer from the 0.8-second mark.

[0049] If the patient does not take a step within 1 second, a vibration alert will be issued, and the circuit will continue to wait until the patient takes the second step before starting a new cycle.

[0050] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A synchronous beat drive circuit for gait rehabilitation training, characterized in that, include: Gait signal detection and shaping circuit, used to connect to gait sensor and acquire gait trigger pulses corresponding to the user's steps; The gait signal detection and shaping circuit includes a voltage comparator, the non-inverting input of which is connected to the output signal of the gait sensor, and the inverting input of which is connected to a reference potential. An adjustable reference pulse generating circuit, the trigger input of which is connected to the output of the gait signal detection and shaping circuit; The adjustable reference pulse generating circuit includes: a 555 timer chip, wherein pins 6 and 7 of the 555 timer chip are connected to ground through a first capacitor, and pin 7 is also connected to the power supply potential through an adjustable resistor; A vibration drive circuit, the input of which is connected to the output of the adjustable reference pulse generator circuit, is used to convert the reference pulse signal into a tactile vibration signal; When the 555 time base chip receives the gait trigger pulse, it starts a new 555 time base timing cycle, and after the timing time T ends, it generates the next reference pulse signal and triggers the vibration drive circuit.

2. The synchronous beat drive circuit as described in claim 1, characterized in that, The adjustable reference pulse generating circuit is a retriggable monostable multivibrator.

3. The synchronous beat drive circuit as described in claim 2, characterized in that, The timing time T of the retriggable monostable trigger is determined by an external resistor and capacitor connected to it, and the timing time T is continuously adjustable in the range of 0.5 seconds to 2.5 seconds.

4. The synchronous beat drive circuit as described in claim 3, characterized in that, The capacitor is 10uF, and the adjustable resistor has a full-scale range of 500kΩ.

5. The synchronous beat drive circuit as described in claim 1, characterized in that, The gait signal detection and shaping circuit includes a Schmitt trigger, which is used to shape the signal from the gait sensor, eliminate jitter, and output a standard gait trigger pulse.

6. The synchronous beat drive circuit as described in claim 1, characterized in that, The vibration drive circuit includes a switching transistor and a vibration motor. The control electrode of the switching transistor receives the reference pulse signal to control the on / off state of the power supply circuit of the vibration motor.

7. The synchronous beat drive circuit as described in claim 1, characterized in that, It also includes a status indicator circuit, which is connected to the output of the adjustable reference pulse generator circuit and is used to indicate the generation of the reference pulse signal by turning an LED indicator on or off.

8. The synchronous beat drive circuit as described in claim 1, characterized in that, The circuit is integrated into a wearable device.

9. The synchronous beat drive circuit as described in claim 8, characterized in that, The wearable device is a foot protector, insole, or a garment worn around the ankle.

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