Design And Implementation Of Finger Rehabilitation Training System

Among stroke patients,30%-66% are left with hand dysfunction after treatment,mainly hand extension disorder.Rehabilitation training can help patients regain their loss functions.The finger rehabilitation training system integrates robotics,rehabilitation medicine,control technology,sensor technology,mechanical design,electronic information,computer technology,etc.It has important research and application value for finger rehabilitation of stroke patients.In the entire finger movement function,the disability indexes of the thumb,index finger,middle finger,ring finger,and little finger are respectively 40%,20%,20%,10%,10%.The functions of the thumb,index finger and middle finger totally account for 80%.Aiming at the core finger-to-finger training function rehabilitation training problem in the existing finger rehabilitation training system,this paper designs and implements a set of finger rehabilitation training system,the system including: The overall design of the system,the 3D modeling of the hand,the design of the mechanical structure for the rehabilitation training,the control system,the passive and active training modes,and the host computer monitoring system,etc.The main research work is as follows:(1)Analyze the physiological structure of the human hand,the mechanical structure of rehabilitation training is designed and realized,which meet the needs of the finger training system.First,for the safety of the device,a mechanical limit circlip,a photoelectric limit switch and an emergency stop button of the host computer are designed,and multiple measures are adopted to ensure the safety of finger training.Secondly,considering the reliability of the device transmission in the finger training process,the ball screw and the shock-absorbing circular belt are used to convert the motor rotation into a translational output stably and efficiently.(2)The control system for finger rehabilitation training is designed and implemented.Mainly include: overall design of control system,passive and active training mode and host computer monitoring system.According to the number of fingers participating in the training,the passive training mode of single finger,two finger and three finger was designed.In addition,in order to improve patient participation and training effects,two active training modes including gesture recognition and voice interaction were designed.In the gesture recognition system,a 7-and the classification results are transmitted to the host computer to guide the motor to drive the affected side hand movement.In the voice interaction system,text recognition is performed on the action instructions issued by the doctor or patient,and the training is guided according to the recognition result.(3)The finger rehabilitation training system is tested under the guidance of a rehabilitation medical therapist.Experiments show that the hardware limit of the mechanical structure,the photoelectric limit of the limit switch,and the emergency stop software limit of the host computer can ensure the safety and stability of the finger in different rehabilitation training modes.In the passive training mode,the rehabilitation training device assists the patient's fingers in rehabilitation training.In the humancomputer interaction mode,the patient sends out control commands through corresponding gestures or inputting specified voices.The controller drives the motor to rotate through the motor drive,and drives the patient's fingers through the rehabilitation training device for rehabilitation training,so as to achieve the purpose of the patient actively participating in rehabilitation training.The average recognition rate of gestures in the gesture recognition rehabilitation training mode was 90.1%;the speech recognition rates in the speech recognition rehabilitation training mode in the laboratory work area environment and laboratory activity area environment were: 95% and 88%,respectively.It shows that in the active training mode,the device can enable the user to actively participate in the finger rehabilitation training process.