Study On The Design,Fabrication And Sensing Characteristics Of Biomimetic Membrane Semicircular Canal

The semicircular canal is an important part of the human inner ear.From the outside to the inside,there are the bone semicircular canal and the membranous semicircular canal.The bone semicircular canal and the membranous semicircular canal are filled with perilymph,and the membranous semicircular canal is filled with endolymph.The structure of a single membranous semicircular canal is composed of nearly two-thirds of the circular tube,the utricle connected at one end,and the enlarged ampulla at the other end.There is crista ampullaris in the ampulla.The human body can sense the angular acceleration of the head through the concave and convex deformation of the cupula terminalis of crista ampullaris.Because the membranous semicircular canal is located in the vestibular system and has a complex structure and small size,the relationship between its structure and function is still unclear.This subject imitates the biological structure of the membrane semicircular canal,and uses a self-made surface symmetric electrode containing a metal core PVDF fiber(SMPF)to prepare a bionic cilia sensor,and the bionic membrane semicircular canal solid model was designed and prepared at a ratio of 1:10.Based on this model,the sensing theoretical model of angular acceleration perception of the bionic membrane semicircular canal was established,and the relationship between structure and function of the bionic membrane semicircular canal was studied and verified by experiments.The specific research content is as follows:1)Imitating the structure of hair cell cilia in the membranous semicircular canal,the SMPF bionic cilia sensor was designed and prepared.Using the first type of piezoelectric equation,a theoretical model of bending deformation sensing of the cantilever beam structure SMPF is established and verified by experiments.The results show that the SMPF sensor can sense the waveform,amplitude,frequency and other parameters of its ownbending deformation.2)The bionic crista ampullaris was designed and prepared by embedding the SMPF bionic cilia sensor into the silicone rubber,and the bionic crista ampullaris was installed in the straight tube to design and prepare the bionic membrane semicircular canal straight tube.The sensing theoretical model of the linear acceleration of the straight tube was established.The experimental verification shows that the SMPF bionic cilia sensor can sense the waveform,frequency,amplitude and other parameters of the concave and convex deformation of the cupula terminalis of the bionic crista ampullaris,and the amplitude of the output signal has a linear relationship with the displacement of the center point of the cupula terminalis.3)Imitating the structure of the human membrane semicircular canal,the bionic crista ampullaris was installed in the ampulla position,and the bionic rigid membrane semicircular canal was prepared by using 3D printing to prepare the membrane semicircular canal shell.The bionic elastic membrane semicircular canal was prepared by using AB glue to prepare the membrane semicircular canal shell and 3D printing to prepare the bone semicircular canal shell.When the two types of bionic membrane semicircular canals were tested in the horizontal plane,the mass-spring-damping system is used to establish the angular acceleration sensing theoretical models of the two types of bionic membrane semicircular canals,and the experimental system is set up for experimental verification.The experimental results show that the two types of bionic membrane semicircular canals can sense the waveform,frequency,amplitude and other parameters under the excitation of sinusoidal signal angular acceleration,and the amplitude of the output signal has a linear relationship with the angular acceleration value.Under the same excitation conditions,the amplitude of the output signal of the bionic rigid membrane semicircular canal is greater than the amplitude of the output signal of the bionic elastic membrane semicircular canal.In the vertical plane,the two types of bionic membrane semicircular canals can also sense angular acceleration,and the amplitude of the output signal is in a sinusoidal relationship with the angle of the bionic crista ampullaris.Both the theoretical sensing model and the experimental results show that the two types of bionic membrane semicircular canals designed and prepared in this project can sense angular acceleration,and the membrane semicircular canals can be simulated as spring elements in the sensing model,which plays the role of easing the impact and absorbing and storing energy during the movement of the membrane semicircular canals.