Research Of Freezing Gait Assistant System Based On Wearable Device

Parkinson’s disease(PD),also known as "tremor paralysis" clinically,is a common degenerative disease of the elderly nervous system.Its initial symptoms are usually tremor or clumsy movement of one limb,and then involving the opposite limb,mainly manifested as static tremor,slow movement,myotonia and postural gait disorder.Freezing of gait(FOG)is a special form of gait disorder in Parkinson’s disease.It is characterized by recurrent gait retardation,which often occurs in the middle and late stages of the disease.At the same time,the cause of the disease in the current medical research has not been determined.Data survey in recent years shows that there are 1,700 patients per 100,000 people over the age of 65 in China.The number of PD patients increases significantly with the increase of age,and the number of male patients is slightly higher than that of female patients.Freezing gait due to its sudden and severe impact on Parkinson’s disease patients’ ability to daily activities,reduces the quality of life.Therefore,how to deal with the sudden situation of freezing gait in time and reduce the degree of patients affected by it is of great significance for improving the quality of life of patients.At present,the improvement and remission of Parkinson’s disease are mainly through drug therapy and physical therapy.Therefore,this paper proposes a wearable device based freezing of gait auxiliary technology,which can relieve the freezing gait condition by means of physical therapy and help patients recover in time.The main research and work of this paper are as follows:1.The background and significance of freezing gait detection and improvement in Parkinson’s disease patients were analyzed.The research status of freezing gait detection and improvement methods at home and abroad was investigated,and the advantages and disadvantages of various methods at home and abroad were summarized.2.The functional indexes and design principles of freezing gait assist system were explored,and the implementation scheme of Parkinson’s freezing gait assist system based on embedded wearable device was constructed.3.The existing methods to improve freezing gait were studied.Wearable devices including visible light indicator,vibration system and audio response system were designed comprehensively.Various stimulation methods were used to prompt patients to recover in time.4.A new freezing gait detection method combined with freezing threshold and other criteria was proposed to distinguish normal walking posture and freezing gait of patients wearing the auxiliary system.By comparing the characteristics of clinical test data and experimental data,the validity of the freezing gait detection method was verified.The experimental results show that the effectiveness meets the evaluation criteria.5.According to reasonable system design,integrate ARM series microcontroller with inertial sensor to make wearable embedded device,transplant and test freezing gait detection algorithm,and control the device to promote patients to recover in time and return to normal walking state by various stimulation methods during the event.Finally,a wearable freezing gait auxiliary device with high comfort level was designed.In the experimental test,the freezing gait was accurately identified and assisted to recover,which reached the expected design index requirements,proving the practical value of the auxiliary system.6.At last,the work of this paper was summarized,a series of physiotherapy methods and system design for Parkinson’s patients,including improving freezing gait is expected.