Research and Design No Light Spot in Front Located Hysteroscopy

This paper first introduces the recent development of the popular hysteroscopy, the international minimally invasive diagnosis instrument, and then analyzes the lighting and video of hysteroscopy. According to high energy consumption of common hysteroscopy, front located hysteroscopy system is put forward. The no light spot principles, the lens structure, the manufacture process of lens prototype, the trial manufacturing process of power box are all discussed in this paper. It is the first time that prototype has been design and tested in domestic. In the normal conditions, the energy consumption decreased by 298/300. And the volume, the weight, and the price of the designed front located hysteroscopy are greatly reduced. Moreover, tests show that it can apply to special conditions such as the disaster relief field and field operation.


Introduction
Hysteroscopy is the advanced minimally invasive medical instrument [1], used for examination and treatment of gynecology uterine cavity.In October, 2010, the 64th session of China international medical equipment exposition, numerous hysteroscopy produced by Chinese and foreign manufacturers are exhibited.In spite of the different in manufacturer and brands, the working principle and composition are the same.The working principle and composition of hysteroscopy are shown in figure 1, the front of the lens body is inserted to the uterine and enlarge the to-be-observed parts.Because of its intuitive and preciseness, it becomes the first choice in examining the gynecological hemorrhagic diseases and intrauterine lesions.It is a kind of fiber illuminant endoscope, mainly including chamber lens, energy system, illuminant systems and imaging system.
A 300W xenon lamp is used as the power source.Light is transmitted by optical fiber and the lighting is realized by the light of the conduction body.Image can be gained through imaging system by light transmitting to cavity via video conversion on the monitor.Energy systems provide energy for the light source system and the imaging system.The combination device has a characteristic of high power consumption, big volume, high price and rigid using environment.Researches show: light shall finally focused on local lighting of the irradiated content, light loss in optical cable and optical transmission conduction; the long transmission distance by light transmission to cavity lens imaging also brings certain loss.Therefore, the front located hysteroscopy is first developed and tested, and the effect is satisfactory.  .The total power of luminous is less than 0.5W.The cavity lens adopt a φ2mm high-definition camera and a φ3.5mm decoding video circuit.A 0.2 mm crystal abrasive disc is used to protect the video circuitry.All of the devices are installed in a space with φ5mm and 15mm-long, The silver line which can be resistant to high temperature is used to draw the control video out with 2 piece of wires.one is for videoing, and the other one is for lighting.Test the parameter of the voltage current of LED [2], [4], and measure the working properties, determine the control parameters, control scheme and connection schemes based on the special requirements of surgical instruments.2. parameters, control scheme and connection schemes based on the special requirements of surgical instruments.Determine cameras and decoding working circuit voltage range, also combined with surgical instruments special requirements to determine control parameters, control scheme.3. Manufacture the camera shell in machining method, welding method as shown in Figure 5 4. Weld clear cameras and decoding circuit with the power line, video line.Weld six miniature HLEDs and draw the lighting line, the length of the wire should be exceeded the connection plug tail 10mm. 5. Make the camera and LED lead on the left and thread through the steel body on the right.
The wire should be through the right and until to the tail part.6. Detect the working situation of the cameras and the LED.If it is normal, go to the next step.7. Fix the cameras, the LEDs and the decoder circuit.8. Test circuit.9. Fix crystal chips.10.Install and fix the connecting plugs

B . Trial Production of Power Box
The constitute of the power box as shown in Figure6. 1. Design and install the camera circuit and the LED control circuit using the multi-function PCB with 30mm-wide and 50mm-long [5] [6].By measuring parameters through the instrument, their parameters should be adjusted to correspondent with the need of lens prototype.

Figure 2 .
Figure 2. New hysteroscopy system C.The Constitute of the Front Located Hysteroscopy LensThe constitute of the front located hysteroscopy lens is shown in figure3.On the left, it is the face Schematic.And on the right of Figure3, it is the side schematic diagram.The light source systems adopt the six HLEDs to realize the lighting[2] [3][4].The total power of luminous is less than 0.5W.The cavity lens adopt a φ2mm high-definition camera and a φ3.5mm decoding video circuit.A 0.2 mm crystal abrasive disc is used to protect the video circuitry.All of the devices are installed in a space with φ5mm and 15mm-long, The silver line which can be resistant to high temperature is used to draw the control video out with 2 piece of wires.one is for videoing, and the other one is for lighting.

Figure 4 .
Figure 4.No light spot the Front Located Hysteroscopy Lens After the test, Keystone ring Angle is 5 degrees.