Intelligent Self-powered Sensing Microsystem For Artificial Prosthesis

With the continuous development of the Internet of Things and medical technology,intelligent implantable medical devices have been applied more and more widely in the clinic.Microsystems for low-power applications are also applied more and more in intelligent electronic devices to monitor various health indicators of the human body in real time.Smart electronic devices depend on battery life,and for implantable electronic medical devices,surgery to replace batteries increases the cost of treatment.Therefore,human-oriented micro-nano energy harvesting technology has brought new possibilities for the development of implantable medical electronic devices.Micro-nano energy harvesting technology has been widely used in daily life according to its different working principle characteristics.Intelligent self-powered system mainly includes micro-nano energy harvesting technology,power management circuit and low-power application.In this thesis,a micro-energy harvesting device for artificial knee implants is designed.After being processed by the power management circuit,a stable DC voltage is output to power the low-power accelerometer.The sensor function is realized through the control chip,so as to monitor the implant.The research content of this thesis is mainly divided into the following three aspects:Firstly,for artificial knee implants,an electromagnetic micro-energy harvesting device is designed,which can convert mechanical energy into electrical energy output.The device model under magnetic field is established by using COMSOL multi-physical field simulation software.At the same time,a single variable is controlled to conduct multi-parametric simulation research of the device.The influence of the displacement and velocity of moving magnet on voltage and current of coil is analyzed,and the multiparameters of magnet and coil are simulated and analyzed,and the influence law of magnet and coil parameters on the electrical output of devices is explored.Secondly,based on the parameters optimized by simulation,SolidWorks 3D design software and 3D printing technology were used to prepare the device.Magnets and coils with different parameters were used to prepare the device and test the electrical output.The influence of magnet and coil parameters on the electrical output of the device was explored in the actual situation,and the output performance of the device was optimized.The correctness of the simulation results is verified,and the optimized device parameters are given.At the same time,the average power output,peak power output of matched load and durability were evaluated.The feasibility of the self-driven system is proved by optimizing the device for the scene and using the device to drive the low-power electronic device.Finally,in the construction and research of the artificial prosthetic-oriented intelligent self-driven sensing microsystem,a flexible power management circuit integrating rectification,energy storage and voltage regulation is designed,and the acceleration value of the sensor is read and the angle is calculated and dynamically tested,which verifies the feasibility of the artificial prosthetic-oriented intelligent self-driven sensing microsystem.It provides a solution to the battery energy consumption of implantable electronic medical equipment.