Optimization Design Of Magnetically Driven Capsule Endoscope

Capsule endoscope integrates modules such as image acquisition,illumination and data transmission,and is used for digestive tract inspection.It has the advantages of small size,light weight,wide inspection range and painless.Compared with traditional endoscopy,it can effectively relieve the pain of patients during inspection.However,the further development of capsule endoscopy is limited due to the problems of uncontrollable,long inspection time and high missed diagnosis rate.At present,the actively driven magnetron capsule endoscope is mainly used for gastric examination,and intestinal examination is still difficult to achieve.Mainly due to the lack of theoretical and model data on intestinal motility in capsule endoscopy.In order to solve the above problems,this paper mainly carried out three aspects of research:Firstly,the mechanical modeling was carried out,the relationship between the capsule endoscope’s movement in the intestine was analyzed,and the contact model when it was in the quasi-flat region was established.Through the experimental test,the data of the capsule endoscope moving at low speed is fitted,which is consistent with the Stribeck effect,and the theoretical calculation proposes an ellipsoid capsule endoscope,which proves its superiority in intestinal examination.Then,the internal image acquisition and transmission system of the capsule endoscope is optimized,and the various modules and their functions in the capsule endoscope are briefly analyzed.Image sensor,lighting module and data transmission model selection analysis,analysis of image sensor pins and their functions.The minimal system schematic diagram and PCB diagram of the image sensor are designed and drawn through Altium designer software,and the functions of each module are verified through manufacturing.Finally,the magnetron capsule endoscope formed by image acquisition module,illumination module and data transmission module is fabricated,integrated and tested.The characteristics of friction between ordinary cylindrical capsules and ellipsoid capsules were compared through experimental analysis,and the factors affecting the friction force of ellipsoid capsules were explored.In this study,the mechanical model of capsule endoscope in the intestine was established first,and the method of reducing the friction force of the capsule endoscope in the intestine was explored.The image acquisition and transmission system of the capsule endoscope is further optimized,and the image transmission is optimized to video transmission,which will greatly reduce the missed diagnosis rate of digestive tract examination.This research will provide theoretical and data support for the control and miniaturization of magnetron capsules,which is crucial for further improving inspection efficiency.