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The Structure And Principle Of Medical Endoscope

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Update time : 2023-08-19 16:58:00
Medical endoscope is an important diagnostic and therapeutic tool in modern medicine. Through its precise structure and advanced principles, doctors can observe and treat patients' internal tissues and organs at the microscopic level. The structure and working principle of medical endoscope will be introduced below, and the mystery of this technology will be unveiled.
Composition of medical endoscope system
Medical endoscope is a multidisciplinary system integrating optics, ergonomics, precision instruments, modern electronics, mathematics, software and other technologies. It is mainly used to observe lesions in the human body and provide vision for internal operations. Medical endoscopes usually consist of a flexible or hard tube that can enter the human body, a lens imaging system that captures and transmits images of internal tissues and organs of the patient, an image processing system that digitizes the captured images, and presents the digitized images to the operator or observer. It is composed of the display system of the operator, and the light source system that transmits light to improve the visibility of the inspected area.
Medical endoscope is composed of three major systems. The medical endoscope system includes an endoscope mirror body, an image processing module and a light source module, wherein the mirror body further includes an imaging lens, an image sensor, and an acquisition and processing circuit.
Lens System: The lens of an endoscope consists of a set of lenses responsible for transmitting the image of the area being observed to a camera or vision system. These lenses help adjust focus and field of view to ensure clear imaging.
Light source system: Medical endoscopes require a light source to illuminate the area being observed. The light source system usually includes parts such as fiber optic bundles, bulbs, and reflectors to ensure that enough light can enter the body cavity.
Curved Sections: Endoscopes often have flexible sections to allow exploration in the curved paths of internal organs. These bends consist of flexible wires or bladders that bend under the control of a joystick.
Conduit and Channel: The catheter of the endoscope is used to guide the endoscope into the body cavity, while the channel allows the passage of surgical instruments or sampling tools for treatment or sampling.
Vision system: The vision system of medical endoscope usually includes camera, display and image processing equipment. The camera captures the image transmitted by the lens and displays it on a monitor for the doctor to observe.
Endoscopic imaging lenses mostly use aspherical lenses, and image sensors include micro image (CCD) sensors and CMOS sensors. The core technologies of acquisition and processing circuits include field programmable logic gate array (FPGA) technology, digital signal processing (DSP) technology and ultra-small component packaging technology. The endoscope image processing module uses noise reduction algorithms, time noise reduction technology, time filtering technology and other noise reduction technologies, as well as false color imaging technology, digital filtering technology, i-Scan or intelligent spectroscopic colorimetry (FICE) technology, autofluorescence Edge enhancement techniques such as imaging (AFI) techniques. In the cold light source module, LED lamps gradually replace xenon lamp lighting due to their advantages in cost and energy consumption.
Medical endoscopes are mainly divided into the following two categories:
Rigid tube endoscope: non-bendable, enters human sterile tissues, organs, and sterile chambers through a surgical incision, mainly including laparoscopy, thoracoscopic, arthroscopy, etc. Rigid tube endoscopes can be divided into white light rigid mirrors and fluorescent hard mirrors.
Hose-type endoscope: can be bent freely, enter the body through the natural cavity of the human body, the mirror body is long and flexible, the optical signal transmission distance is long, the diameter of the insertion part of the mirror body is small, and the function integration is complicated, which has great influence on the design process. And manufacturing technology requirements are higher, with high technical barriers, mainly including gastroscopy, colonoscopy, bronchoscopy and so on.
Endoscopic Imaging Lens
With the miniaturization of medical wounds, the miniaturization requirements for endoscopic imaging lenses are becoming increasingly stringent, requiring low-length, small-diameter imaging lenses to minimize the volume of endoscopic lenses.
How to solve the technical problem of small size and high imaging quality of endoscopic lens is the direction and topic of endoscopic research. In the past, the imaging lens was designed with a spherical surface, which increased the aberration and deformation, resulting in obvious blurred images, distortion of the field of view, and narrow field of view. However, the current aspheric surface design is composed of a spherical surface and a curved surface other than a plane. Through Changing the curvature of the lens makes the light converge at a fixed focus, corrects the image, solves problems such as distortion of the field of vision, and makes the lens lighter, thinner, and flatter.
The medical endoscopic lens developed and produced by Wavelength Optoelectronics is small in size and easy to use. At the same time, it has good color reproduction, small distortion, high resolution, and good imaging quality. It has a large magnification and can also be used for some small lesion areas Clear observation is beneficial to improve the probability of successful surgery in the cavity.
Wavelength photoelectric endoscope product parameter selection
We have many years of experience in manufacturing medical lenses. The existing product models are small in size, large in depth of field, low in distortion, reliable in durability and waterproof. Customized production and development can also be carried out according to customer requirements.
In short, the structure and principle of medical endoscopes enable doctors to diagnose and treat at the microscopic level, thereby achieving more precise and non-invasive medical methods. This technology plays a vital role in modern medicine, providing patients with better medical experience and treatment outcomes.
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