The working principle of medical fiber endoscope is that the image is transmitted by high quality image transmitting fiber, which is directly investigated by eyepiece. The fiberscope consists of an insertion part (front end part, zigzag part and soft part), an operation part and an eyepiece part. The image fiber bundle, optical fiber and steel wire for adjusting the front end swing angle are all built-in, and are equipped with a special cold light source. Next, I'll share it with you from the small edition of endoscope equipment maintenance.

　　1.纤维内窥镜头部

　　1. fiber endoscope lens

　　头部是软性内窥镜靠前端呈硬性的一小段，它有侧视式、前视式二种。

　　The head is a small hard segment of the soft endoscope near the front end. It has two types: side view type and front view type.

　　侧视式：它是指调查和效果部位坐落旁边面，常用来调查内壁有无缺陷；

　　Side view type: it refers to the investigation and effect of the part located on the side surface, commonly used to investigate whether the inner wall is defective;

　　前视式：它的调查窗在前方，常用来调查前方有无异物。

　　Forward looking type: its investigation window is in front, which is often used to investigate whether there is foreign body in front.

　　不论哪种形式，头部都包含：

　　Either way, the head contains:

　　a)纤维内窥镜 光孔：光导纤维将外部照明光导入，由此孔射出，照亮调查部位；

　　a) Fiber endoscope light hole: the optical fiber leads in the external illumination light, from which the light is emitted to illuminate the investigated part;

　　b)物镜孔：此处装有保护玻璃及物镜、导像纤维束的端部，棱镜等。物镜常用固定焦点式，使用中不再调焦，结构可简单些。为加大景深，选用短焦距，如f′可为3～6mm，视场角为40°～60°，调查距为3～100mm。调查距小时，放大倍率较大而视场较小。也有选用调焦式的，调查效果好些，但结构和操作要杂乱些。

　　b) Objective hole: there are protective glass, ends of objective lens and image fiber bundle, prism, etc. The objective lens is usually fixed focus type, no longer focusing in use, and the structure can be simpler. In order to increase the depth of field, short focal length is selected. For example, f ′ can be 3-6mm, field angle is 40 ° - 60 °, and survey distance is 3-100mm. When the survey distance is small, the magnification is large and the field of view is small. There are also focussed ones, which have better investigation results, but the structure and operation should be disordered.

　　2.纤维内窥镜曲折部

　　2. Zigzag part of fiberscope

　　其效果为使头部能上下、左右活动，以增加调查区域、盲区。要求曲折的角度尽量大、曲折的半径尽量小，曲折段的长度也尽量小。对前视式，要求曲折的角度达180°；而对侧视式，则要求90°即可；

　　Its effect is to enable the head to move up and down, left and right, so as to increase the investigation area and eliminate the blind area. It is required that the angle of twists and turns should be as large as possible, the radius of twists and turns should be as small as possible, and the length of twists and turns should be as small as possible. For the forward-looking type, the zigzag angle is required to be 180 °; for the side-looking type, 90 ° is required;

　　曲折部内有导光纤维、导像纤维、各种通道以及牵引设备。

　　There are optical fiber, image fiber, various channels and traction equipment in the zigzag part.

　　曲折选用钢丝牵引的方式，头部有四根钢丝连向操控部。扭动操控部的手轮，即可别离拉动不同的钢丝绳，使头部向相应的方向摇摆。

　　Zigzag selection of steel wire traction mode, the head has four steel wires connected to the control part. Twist the hand wheel of the control part to separate and pull different wire ropes, so that the head swings in the corresponding direction.

　　曲折部的外层为蛇皮形套管。要求柔软、挠性好，头部及软管部结合结实，密封好。

　　The outer layer of the zigzag part is serpentine casing. It is required to be soft and flexible, and the head and hose part shall be combined firmly and sealed well.

　　3. 纤维内窥镜软管部

　　3. Fiberscope hose

　　软管部是表现整个内窥镜长度的部分。装有导光束、导像束、牵引钢丝等，外包不锈钢带软管及金属网管。

　　The hose part is the part representing the whole length of the endoscope. Equipped with beam guide, image guide, traction wire, etc., wrapped with stainless steel hose and metal network management.

　　4.纤维内窥镜操控部

　　4. Fiber endoscope control department

　　操控部是进行操作操控和调查的部位。包含目镜、导光束连接口、头部曲折操控钮等。要求重量轻、操作灵敏、可靠。

　　The control department is the place for operation control and investigation. Including eyepiece, guide beam connector, head zigzag control button, etc. Light weight, sensitive and reliable operation are required.

　　对目镜，要求有足够的视界、明晰并有屈光调节。通常光导纤维传像为1:1，因此内窥镜的总放大率取决于物镜和目镜。

　　For eyepiece, it is required to have enough visual field, clarity and refractive adjustment. Generally, the image transmission of optical fiber is 1:1, so the total magnification of endoscope depends on the objective and eyepiece.

　　5.导光缆

　　5. Optical cable

　　纤维内窥镜的导光缆用以连接光源和内窥镜。

　　The fiber endoscope's guide cable is used to connect the light source and the endoscope.

　　以上是对医用纤维式内窥镜工作原理的详细介绍，由内窥镜设备维修友情分享，想要了解更多欢迎咨询网站http://www.jiangrenyiliao.cn。

　　The above is a detailed introduction to the working principle of medical fiber endoscope, which is shared by endoscope equipment maintenance. If you want to know more, please consult the website http://www.jiangrenyiliao.cn 。