The endoscopy is the most direct and effective means for digestive tract diseases.Medical workers can conduct a series of manipulations with the help of endoscope,including checking,removing,stripping the diseased tis...The endoscopy is the most direct and effective means for digestive tract diseases.Medical workers can conduct a series of manipulations with the help of endoscope,including checking,removing,stripping the diseased tissue or placing the stent.In order to understand the frictional behaviour at the endoscope-oesophagus interface,the finite-element model was analysed by Abaqus in this study.Considering the different modelling conditions,the total force due to frictional stress,frictional dissipation and the maximum Mises stress for the whole model were studied.Results showed that with the increasing amplitude,coefficient of friction and decreasing diameter,the total forces due to the frictional stress and the FD increased obviously.It did not present a clear difference with the variable distance for overlapping parts(region L).The positions of maximum Mises stress for the whole model under different conditions mainly focused on the initial part of the region R.The maximum Mises stress between different diameters showed a big difference.The results can provide the basic data for the finite-element modelling of frictional behaviour of human tissue.展开更多
The micromechanical properties of soft tissue can be used as markers for the physiological state and function of the tissue.Deep understanding of the micromechanics of soft tissue,such as the oesophagus,is of great si...The micromechanical properties of soft tissue can be used as markers for the physiological state and function of the tissue.Deep understanding of the micromechanics of soft tissue,such as the oesophagus,is of great significance to the design of artificial oesophagi,endoscope materials and coatings for medical devices.Here,the micromechanical properties of oesophageal mucosa were studied under different loading rates,deflections,and dwell time by using atomic force microscopy.The micromechanical properties of soft tissue included elastic modulus,plasticity and adhesion force.Results showed that the micromechanical properties changed with increasing loading rate,deflection and dwell time.The micromechanical properties of oesophageal mucosa were related to time-dependent behaviours,such as contact stress,energy transformation,and strain gradient plasticity.Furthermore,the heterogeneity of oesophageal mucosa affected the micromechanical properties.The force mapping mode was a reliable and effective means to study the micromechanical properties of soft tissue.The results can provide a basis and technical support for the diagnosis of oesophageal diseases from a microscale as well as a material design perspective.展开更多
基金supported by the National Natural Science Foundation of China(nos.51675447).
文摘The endoscopy is the most direct and effective means for digestive tract diseases.Medical workers can conduct a series of manipulations with the help of endoscope,including checking,removing,stripping the diseased tissue or placing the stent.In order to understand the frictional behaviour at the endoscope-oesophagus interface,the finite-element model was analysed by Abaqus in this study.Considering the different modelling conditions,the total force due to frictional stress,frictional dissipation and the maximum Mises stress for the whole model were studied.Results showed that with the increasing amplitude,coefficient of friction and decreasing diameter,the total forces due to the frictional stress and the FD increased obviously.It did not present a clear difference with the variable distance for overlapping parts(region L).The positions of maximum Mises stress for the whole model under different conditions mainly focused on the initial part of the region R.The maximum Mises stress between different diameters showed a big difference.The results can provide the basic data for the finite-element modelling of frictional behaviour of human tissue.
基金supported by the National Natural Science Foundation of China(no.51675447).
文摘The micromechanical properties of soft tissue can be used as markers for the physiological state and function of the tissue.Deep understanding of the micromechanics of soft tissue,such as the oesophagus,is of great significance to the design of artificial oesophagi,endoscope materials and coatings for medical devices.Here,the micromechanical properties of oesophageal mucosa were studied under different loading rates,deflections,and dwell time by using atomic force microscopy.The micromechanical properties of soft tissue included elastic modulus,plasticity and adhesion force.Results showed that the micromechanical properties changed with increasing loading rate,deflection and dwell time.The micromechanical properties of oesophageal mucosa were related to time-dependent behaviours,such as contact stress,energy transformation,and strain gradient plasticity.Furthermore,the heterogeneity of oesophageal mucosa affected the micromechanical properties.The force mapping mode was a reliable and effective means to study the micromechanical properties of soft tissue.The results can provide a basis and technical support for the diagnosis of oesophageal diseases from a microscale as well as a material design perspective.
