Design Of Small-caliber High-resolution Oto-endosocpe With 30° Viewing Angle

Minimally invasive surgery has become an important trend in surgery.As the main equipment for minimally invasive surgery in ear surgery,the oto-endoscope plays a key role in the success of oto-endoscopic surgery.Compared with other endoscopes in other medical fields,oto-endoscope appeared nearly a century later.Neither domestic oto-endoscopes technology nor foreign oto-endoscopes technology has reached the highest level.Chinese endoscope industry started late and the technology is still immature.The quality of domestic oto-endoscopes is not as good as foreign brands.Most of the oto-endoscopes in Chinese hospitals are imported,which greatly increases the cost of medical treatment.Therefore,it is necessary to accelerate the independent research and development of domestic oto-endoscopes and produce high-end,low-cost oto-endoscopes.In view of the existing image quality and durability of domestic oto-endoscopes,this paper studies the small-caliber high-resolution oto-endoscope system with 30° viewing angle from the perspective of reducing cost and improving resolution.The main research content includes the following parts:Firstly,the composition of oto-endoscope system is studied.The composition and working principle of imaging optical system and lighting optical system are studied respectively,and the evaluation standard of image quality of optical system is determined,which provides theoretical basis for subsequent optical system design.Then,through the previous summary of the existing oto-endoscope products and the analysis of the size of the human ear structure,the design parameters of the 30° optic angle oto-endoscope optical system was determined.The 30° viewing angle oto-endoscope optical system designing was performed using Zemax.In the process of design,in order to obtain better image quality,the objective lens system with relay prism and relay system are optimized in a way of modular design.After obtaining the objective lens system and relay system with good imaging quality,the objective lens system and the relay system are combined to optimize the design according to the pupil matching principle.Finally,a 30° viewing angle oto-endoscope optical system with small aperture,small distortion and high resolution is obtained.In order to ensure that the designed optical system of oto-endoscope can be processed in practice,the tolerance analysis of the optical system is carried out,and the tolerance of the optical system is determined.Finally,TracePro is used to simulate and analyze the ear endoscope lighting system.According to the requirements of ear endoscope,the corresponding cold light source is selected.The usual optical fiber arrangement mode of oto-endoscope with 30°viewing angle is analyzed,and the optimal arrangement mode is selected.TracePro is used to arrange the optical fiber.By inputting the parameters of the actual optical fiber and the relative position between the optical fiber bundle and the object surface,the illumination diagram of the object surface after the optical fiber illumination is simulated.In order to ensure that the designed oto-endoscope system with 30° viewing angle is of engineering significance,SolidWorks is used to carry out the simulation design of the imaging system and lighting system.