Study On The Medical Electronic Hysteroscopic Optical Imaging System

In recent years, the medical endoscope in clinical medicine is widely used; the home also aroused great attention and research on it. This paper analyzes the development history of the endoscope lens, from hard tube endoscope to optical fiber endoscope to ultrasonic endoscope and the development process of electronic endoscope mirror. Hysteroscopy is a kind of medical electronic endoscope, clear the important status of medical electronic hysteroscopy occupied in clinical medical diagnosis, especially the medical electronic hysteroscopy for both doctors and patients to bring great convenience in uterine disease diagnosis free anesthesia. Through the hysteroscopy professional doctor can be observed directly inside the uterus tissue morphology and lesions, but also the image can be observed by CCD detector is composed of cable transmission image eventually reach the video processing center is displayed on the screen, it is convenient for doctors to diagnosis analysis.According to the medical electronic endoscope in uterine cavity development and application in China, describes the current situation of the development of medical electronic endoscope mirror. For the current design and processing level of domestic electronic hysteroscopy to be introduced, and puts forward the limitations of the current domestic products to improve its level. The design of electronic hysteroscopy optical imaging system, describes in detail the design process.This paper mainly studies the imaging lens electronic hysteroscopy, optimization design by using the optical design software ZEMAX to complete the imaging lens. The realization of image electronic hysteroscopy large depth of field, low distortion, no blind area, high clear, increase doctor on the accuracy of patients in vivo diagnosis instrument operation, promoting the application of electronic hysteroscopy development forward.The main research content of this paper includes three parts:1) The design of an electronic hysteroscopy, the maximum field of vision system is 65 degrees, the maximum spatial resolution higher than 75lp/mm, with a larger depth of field, the image illumination uniformity, vertical axis aberration, field curvature and astigmatism are good correction, imaging quality is better.2) Design of a large FOV optical system, can be used for imaging 1/4 inch CCDhysteroscopy. The system has 80 degrees wide viewing angle, maximum spatial resolution, higher than the 75lp/mm of the large depth of field, the image illumination uniformity. Vertical axis aberration, chromatic aberration correction field curvature, has been very good, good imaging quality. System diameter is less than 4.5 mm.3) Optical system design of an spherical based imaging can be matched 1/6 inch CCD hysteroscopy. The maximum field of view system angle of 90 degrees, can be realize the non-blind diagnosis, maximum spatial resolution higher than 100lp/mm, with a larger depth of field, the image illumination uniformity. The introduction of non-spherical, vertical axis aberration, chromatic aberration, field curvature have been corrected well, has good imaging quality. System of diameter less than 3.2mm, because of its small size and optical system to the outer diameter of the uterine disease diagnosis technology, can realize the free anesthesia.