LED Surgical Shadowless Light Operating Room Lamp

Time:2020-12-22

What is an operating shadowless lamp?
Surgical shadowless lamp is special equipment that adjusts the angle of the lamp or the angle of the polished reflective surface to a circular light, so as to achieve the dark shadow or dead angle formed by the structure of the irradiated part, which becomes a picture with uniform brightness and provides lighting for the operation area.

Working principle
The surgical shadowless lamp is designed by using the principle of multi-point light source effect, that is, when there are multiple light sources illuminating an object, some of the light sources are blocked by the object and cannot reach the receiving surface to produce shadows, and the light from other light sources will pass from another The angle illuminates this shadow area, thereby weakening and eliminating the shadow of this area, and finally forming a shadowless area.

Operating shadowless lamp type:
1. Hole type shadowless lamp.
The typical hole-type shadowless lamps include four-hole lamps, five-hole lamps, nine-hole lamps, and twelve-hole lamps. The four types of lamps are 4, 5, 9 and 12 incandescent bulb light sources. The hole lamps can Combine into the structural form of the son-mother lamp, for example, the 12-hole/five-hole son-mother lamp and the nine-hole/five-hole son-mother lamp can also be used alone. Four-hole and five-hole shadowless lamps have low shadowless effects and low illuminance and are mainly used for small-scale surgical lighting.

The cantilever system of the hole-type shadowless lamp has 2 rotating arms, which can rotate 360° around the base. The lamp holder can swing up and down, and the swing range is 15° above the horizontal line to 45° below the horizontal line. After all, the hole-type shadowless lamp is a product in the 1970s, and within its working range, the shadowless lamp cannot be positioned wherever it needs to be.

The hole-type shadowless lamp converges the light of each group of light sources to one point by simultaneously pulling the rods connected to each light source, thereby achieving the effect of reducing the shadow. Each hole of the hole-type lamp has a set of light sources, which are mainly composed of incandescent bulbs, reflective bowls, heat-insulating glass, and white glass to protect the heat-insulating glass.

Hole shadowless light source
The incandescent bulb is fixed on the reflective bowl, and the pull rod pulls the clamp ring clamped on the incandescent bulb, which can drive the reflective bowl to swing in the fixed ring of the reflective bowl to adjust the emission angle of the reflected light. The reflective bowl is fixed on the lamp shell, and the heat insulating glass and the white glass are fixed on the lamp shell by the glass fixing ring. Most of the infrared and ultraviolet rays of the reflected light are filtered through heat-insulating glass and white glass, and the reflected light emitted by each light source is concentrated to form an illumination spot.

2. Overall reflection shadowless lamp
The light source of the integral reflection shadowless lamp is a halogen bulb, and the integral reflection shadowless lamp is composed of a lamp cap, a mechanical cantilever system and a corresponding control circuit.
(1) Lamp holder
There are two specifications for the lamp cap of the overall reflection shadowless lamp, the diameter of the 70 lamp cap is 700mm, and the diameter of the 50 lamp cap is 500mm. The overall reflection shadowless lamp system can have different combinations according to needs, generally according to the diameter of the lamp holder: 700/700, 700/500, 500/500. Different from the hole-type surgical shadowless lamp, the large (700) and small (500) lamps of the overall reflection shadowless lamp can meet the needs of surgical lighting.
The head of the overall reflection shadowless lamp has three main components.
1) Light source assembly: There are 2 halogen bulbs in the lamp holder, one of which is a spare bulb, that is, when the main bulb is damaged, the spare bulb can be automatically activated immediately. By rotating the disinfection handle, the relative position of the halogen bulb to the reflector can be changed, thereby adjusting the spot size and the illumination depth.
2) Reflector: The reflector of the overall reflection shadowless lamp is a composite surface composed of thousands of small planes. The light emitted by the halogen light source is projected onto these thousands of small planes, and the small planes reflect the light to the surgical area. Thousands of small planes with different angles can form thousands of different directions of light into a spot with ideal illumination depth.
3) Heat insulation component: The heat insulation component is a cylindrical hexagonal structure composed of 6 pieces of heat insulation glass. The halogen bulb is installed in the heat insulation tube. The heat insulation glass of the heat insulation tube can isolate the infrared radiation in the lamp. Only cold light with a very small amount of infrared light passes through the heat-insulating tube. The components in the thermal insulation components and the thermal insulation cylinder must be made of high temperature resistant materials.
(2) Mechanical cantilever system
The mechanical cantilever system of the overall reflection shadowless lamp, the mechanical cantilever system of the shadowless lamp is a mechanical device that adjusts the direction of the shadowless light. To meet the optimal angle of surgical lighting, the mechanical cantilever system of the shadowless lamp can accurately position the lamp head in all directions. The mechanical cantilever system uses the bearing to rotate so that the operating lamp can be rotated 360° and positioned in the required position. The mechanical cantilever system has a rotating arm, a balance arm, a hanging arm and a connecting arm, and the joints (joints) connected between them can be moved. The purpose is to allow the user to adjust the light position of the shadowless lamp easily and freely.

3. LED shadowless light
There are two main types of the optical structure of LED shadowless lamps, one is the combination of LED and lens, and the other uses reflective bowl and LED components.
(1) Shadowless lamp with LED and lens as the light source
The single-group optical component of the LED and lens combination shadowless lamp. Its single-group optical component is composed of an LED fixing plate, LED, the convex lens, lens fixing frame, etc. Although LED is a cold light source, its luminous efficiency is very high. It will inevitably generate a certain amount of heat while emitting light. If the heat is not released in time, the temperature of the LED will increase, which will reduce the luminous efficiency of the LED and affect its service life. Therefore, the fixed liner is not only used to fix the LED but also plays a role in dissipating heat for the LED.
The bracket with the lens installed is fixed on the backing plate, and the relative position of the LED light source and the lens is controlled by the bracket. The LED light source is refracted by the lens, and the light emitted by the LEDs at different positions is gathered together to produce a spot with illumination depth.
(2) Shadowless lamp with reflector and LED components as light source
The single-group light source assembly of the reflecting bowl and the LED assembly is composed of an LED fixing block, an LED, a reflecting cup, and a light shield. Since the emitting angle of the LED is generally 120° or 90°, the reflector in the assembly is a combination of 3 hemispheres, so that each reflector has 3 focal points, corresponding to 3 LEDs. The advantage of using the reflective bowl is that the light effect of the LED is utilized to the maximum, and the light loss is small. If a lens is used for refraction, not only the transmittance of the lens (the lens generally uses optical grade acrylic, and the visible light transmittance of acrylic is 92%) will cause the loss of light efficiency, and the utilization rate of the lens refracted light is only about 60° cone The shape angle, even if the lens of the reflective bowl is added, the light loss at the junction of the lens and the reflective bowl is very large.
(3) The structure of the LED shadowless lamp
1) Rotating body: The rotating body assembly of the LED shadowless lamp has two parts: a base and a rotating arm. The base is used to fix the shadowless lamp and place the components such as switching power supply, fuse and terminal block. The rotating arm is connected with the base and the balance arm and can be rotated 360°, which can increase the horizontal working area of ​​the lamp head.
2) Balance arm: used to balance the lamp holder, so that the lamp holder can be accurately positioned at any desired position, and increase the level of the lamp holder, up and down working area. Pull the joint of the balance arm and the lamp holder elbow, you can move up and down and rotate the lamp holder axially. Push the disinfection handle to turn the lamp head back and forth and left and right, and finally adjust the lamp head body to the desired position.
3) Control panel: It is the control device of the shadowless lamp. Using touch buttons, the on-off and brightness adjustment of the surgical shadowless lamp can be controlled through the built-in microprocessor.
4) Circuit control: The electrical block diagram of the LED shadowless lamp is shown in Figure 7.
The network power supply (220V AC) enters the input end of the switching power supply through the power supply noise filter, the switching power supply outputs 24V DC, and the main control circuit board is powered by the transmitter of the rotating arm and the balance arm. The main control system accepts the instruction information from the control panel, and drives the LED light source assembly and the backlight respectively by controlling two LED drive boards. At the same time, the main control system detects the working status of the LED light source assembly (whether the brightness is damaged) in real time, and adjusts the display information on the control panel. The size of the shadowless light spot is mainly adjusted by adjusting the distance between the lamp head and the operation area. The main control board also has the function of judging whether the main light is damaged. When the main lamp is damaged, the main control board can make a judgment and trigger the replacement of the bulb indicator light, requiring immediate replacement of the main lamp.

The main function
Operating shadowless lamp can minimize the shadow cast on the surgical area during surgical activities.

Advantage:
Hole shadowless lamp: It has a relatively large price advantage, and there is still market demand in some underdeveloped areas.
Overall reflection shadowless lamp: high luminous efficiency, can obtain ideal brightness, color temperature and luminous efficiency. Compared with hole-type shadowless lamp and LED shadowless lamp, its shadowless effect is the best.
LED shadowless lamp: LED is a cold light source, the illuminance of infrared and ultraviolet is extremely low, and it has the advantages of low voltage, low energy consumption, long life, strong applicability, high stability, and short response time.
Disadvantage:
Hole shadowless lamp: low luminous intensity, uneven luminescence.
Overall reflection shadowless lamp: higher temperature rise and energy consumption.

Daily maintenance
1. After use, the power must be cut off.
2. When replacing the bulb, you must first cut off the 220V power switch installed on the wall and wait for the bulb to cool down before replacing it.
3. Regularly check the connection status of each connection part of the shadowless lamp. Since the surgical shadowless lamp is a permanent suspension device, its safety is of paramount importance. The status of the connecting nuts and other connecting screws of the rotating body chassis must be checked regularly. If any looseness is found, they should be tightened immediately.
4. The power transformer is placed in the wall or on the ceiling. The heat generated by the control box transformer cannot be dissipated, which will easily cause the transformer to burn out. Therefore, leave enough space for heat dissipation around the transformer. At the same time, in summer, due to the cooling function of the air conditioner, It is easy to cause a large temperature difference, and there will be condensation on the ceiling or wall, which will cause the transformer to enter or get damp, and it is easy to short-circuit, so waterproof measures must be taken.

Common troubleshooting
1. The light is not on
Open the top cover and check whether the fuse is blown and the power supply voltage is normal. If there is no problem with both, please ask a professional to repair it.
2. Transformer damage
Generally, there are two reasons for transformer damage. Power supply voltage problems and circuit short circuits cause over-current to cause transformer damage. The latter should be repaired by professionals.
3. The fuse is often damaged
Check whether the bulb in use is configured according to the rated power specified in the manual. A bulb with too large power will cause the capacity of the fuse to exceed the rated current and cause the fuse to be damaged. Check whether the power supply voltage is normal.
4. Deformation of the disinfection handle
The handle of the shadowless lamp can be sterilized by high pressure (please refer to the instruction manual for details, but please note that the handle cannot be pressed against heavy objects during disinfection. The incense will cause the handle to deform.
5. When the shadowless lamp rotates, the lamp does not turn on
This is mainly because the sensors at both ends of the shadowless lamp boom will have poor contact after a period of use. In this case, you should ask a professional for maintenance.
6. Shadowless light shift
In larger surgical shadowless lamps, after a period of use, due to the heavier weight of the inner lamp cap, greater friction is required for positioning, which will cause movement. Tighten the upper positioning screw to increase the friction.
7. The brightness of the hole-type lamp dims
The reflective glass bowl of the cold light hole shadowless lamp adopts coating technology. Generally, domestic coating technology can only guarantee a two-year life. After two years, the coating layer will have problems, such as dark reflections and blistering. Therefore, it is necessary to replace the reflective bowl when encountering this situation.

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