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Shadowless lamp
Key words: operating room equipment, operating room decoration, operating room equipment, LED shadowless lamp
Operative shadowless lamps are used to illuminate the surgical site to best observe small, low contrast objects in different depths of the incision and body cavity. Since the operator's head, hands and instruments may interfere with the surgical site, the shadowless lamp should be designed to eliminate the shadows as much as possible and to minimize the color distortion. In addition, the shadowless lamp must be able to work for a long time without emitting excessive heat, which can make the operator uncomfortable and dry the tissue in the surgical area.
principle
Shadowless lamp can't be "shadowless", it just weakens the shadow and makes it not obvious. Shadows are formed by illuminating objects. Shadows are different everywhere on earth. If you look closely at the shadows under the electric light, you will find that the middle of the shadows is very dark and the surrounding areas are slightly shallow. The particularly dark part in the middle of the shadow is called the umbra, and the dark part around it is called the penumbra. These phenomena are closely related to the linear propagation of light. If you put a cylindrical tea tube on the table and light a candle next to it, the tea tube will cast a clear shadow. If two candles are lit beside the tea tube, two overlapping shadows will be formed. The overlapping part of the two shadows is completely dark, which is the umbra; beside the umbra, there is only one candle that can shine, which is the penumbra of half-light and half-darkness. If three or even four candles are lit, the umbra part will gradually shrink and the penumbra part will have many layers. It is also true that objects can produce shadows composed of umbra and penumbra under electric light. Obviously, the larger the area of the luminous object, the smaller the umbra. If we light a circle of candles around the tea tube, the shadow will disappear completely and the penumbra will be invisible. Scientists have made shadow-less lamps for surgery based on these principles. It combines a large area of light source by arranging the lamp with high luminous intensity into a circle on the lamp disc. In this way, the light can be illuminated to the operating table from different angles, which ensures that the operative field of vision has sufficient brightness, and at the same time does not produce obvious umbra, so it is called shadow-less lamp.
Form
Surgical shadowless lamp is usually composed of single or multiple lamp heads, fixed on the cantilever, which can move vertically or circularly. The cantilever is usually connected to a fixed connector and can rotate around it. Shadowless lamp uses sterile handle or sterile hoop (crankshaft) for flexible positioning, and has automatic braking and stopping function to control its positioning, so as to maintain appropriate space on and around the operation site. Shadowless lamp fixtures can be placed at fixed points on the ceiling or wall, or on the track of the ceiling.
Types and Evolution
The development of surgical shadowless lamp has experienced from porous lamp, single reflection shadowless lamp, multi-focus shadowless lamp, L.
Shadowless lamp for ED operation, etc.
The right picture is a traditional multi-hole shadowless lamp, mainly through multiple light sources to achieve shadowless effect, while the left one is a more popular Single-Reflection shadowless lamp in China, which is characterized by high illumination and focusing.
At present, porous multi-focus surgical shadowless lamp is more popular in foreign countries, which is the high-end surgical shadowless lamp at present. In addition, the increasingly mature LED surgical shadowless lamp with its gorgeous shape, long service life and natural cooling effect, as well as the concept of energy saving, has gradually come into people's vision.
Use
Shadowless lamps mounted on the ceiling shall be on the ceiling or
The remote control box on the wall is equipped with one or more transformers to convert the input power supply voltage into the low voltage required by most bulbs. Most shadowless lamps have dimming controllers, and some products can also adjust the light field to reduce the light around the surgical site (reflections and flashes from sheets, gauze or instruments can make the eyes uncomfortable).
Daily maintenance
1. Daily inspection
- The working state of the bulb (PRX6000 and 8000). Method: Place a piece of white paper in the working area and change the corresponding light bulb if the arc shadow appears. - Disinfection handle in place. Method: Two clicks were made during installation. - Cleaning: Use weak alkaline solvent (soapy water) to rinse the appearance; avoid using chlorine-containing lotion (injuring metal) and alcohol lotion (injuring plastics and paint).
2. Monthly inspection
Mainly check the standby power supply system (battery) is normal. Method: Cut off 220V power supply to see whether to start standby power supply.
3. Lamp life
Life expectancy is 1000 hours on average; for lamp holders, they are basically replaced once a year.
4. Annual Inspection
Four steps of maintenance (performed by licensed engineer) - tightening power line connector (control box input and output). Screw brush at each joint - adjusting the working voltage of the bulb (23V AC+DC) around the lamp arm of the 4000 type lamp head - checking the verticality of the suspension tube and the balance of the suspension system - checking whether the screw at each joint is tightened properly and whether the brake is properly rotated when the joint moves Installation light spot diameter of sterilization handle for fruit lamp holder bulb.
Five Guarantees
Brightness assurance
Operating room surgeons must be able to accurately distinguish outlines, colors and movements. Therefore, as a surgeon, the intensity of light close to the quality of sunlight is needed. The light of 100,000 lux is determined to be equivalent to the brightness of the sun at noon. In addition, in the surgical environment, most of the light is absorbed rather than reflected, which means that the surgical shadowless lamp must provide greater brightness.