Surgical Lighting Devices

Abstract

The present disclosure relates to a surgical lighting device including a shell (12), multiple light sources (24) coupled to the shell, and a cover plate (18) for shielding the lighting device by allowing light to pass through. The cover plate includes multiple lens elements, each configured to collect and focus light from a corresponding light source to generate a light spot of a predetermined diameter located a predetermined distance from the lighting device. To simplify the construction of the lighting device, the light sources and cover plate are positioned such that light rays coming from the light sources and received by the associated lens elements reach the lens elements substantially without reflection or deflection. Thus, the cover plate includes all of the optics necessary to collect and focus light from the light sources.

Description

[Technical Field]

[0001] The present disclosure relates to surgical lighting devices for use in operating rooms. [Background technology]

[0002] Surgical lights are typically dome-shaped and can be suspended from the operating room ceiling by articulated supports or mounted on a mobile structure. Surgical lights can include one or more light sources, such as LEDs, halogen bulbs, or, more rarely, incandescent bulbs. According to the French standard for surgical lights, NF EN60601-2-41, surgical lights must produce a white light range at a distance of 1 m from the light-emitting zone, which is characterized by a central illumination, diameter, color rendering index, and a specific color temperature to enable optimal viewing conditions for the surgeon. This is typically achieved by using one or more optical devices to collect the light rays emitted by the light source and converge them toward the surgical field. The light is then shielded by an essentially transparent underside, which can collect the light rays or further refract them, but also seal the dome-shaped light in a manner appropriate for a sterile environment.

[0003] The illuminator may comprise a single optical device or a group of optical devices, including, for example, reflectors, counter-reflectors, lenses, collimators, etc. Figure 1 shows the structure of a conventional surgical light. Here, light source 1 is a halogen bulb. The upward-diverging light beams from the light source are collected and reflected downward by a convex reflector 2 positioned above bulb 1. These beams, as well as light beams emitted laterally by the light source, are collected by condenser 3 and formed into a parallel or converging beam. This beam then passes through a series of five prisms toward the surgical field. The surgical light may have a filter 4 that filters out ultraviolet and infrared light from the halogen source. Finally, the optical system is shielded by a transparent bottom surface 6. Each of these different optical devices must be properly positioned and maintained in place within the illuminator. Devices using LEDs as light sources suffer from similar problems, and the challenge is exacerbated by the need to provide an optical device for each LED. For this reason, it is not uncommon for surgical lights to include a light source, any possible printed circuitry, and internal structures for securing various optical devices such as collimators, lenses, or reflectors. Lights are therefore expensive and complex to assemble and maintain. Also, great precision is required during manufacturing to ensure the various elements can be properly aligned. Summary of the Invention [Means for solving the problem]

[0004] The present disclosure aims to ameliorate the problems associated with known devices, and more particularly to provide a surgical lighting device with a simplified design that makes the overall device lighter, more durable, easier to assemble, and less expensive.

[0005] This and other objects are achieved by a surgical lighting device including a shell and a plurality of light sources coupled to the shell, the device further comprising a shielding plate, the shielding plate being at least partially optically transmissive and coupled to the shell and capable of shielding the device by allowing light from the light sources to pass through. The shielding plate includes a plurality of lens elements, each configured to collect and focus light from a corresponding light source to generate an illumination spot of a predetermined diameter located at a predetermined distance from the lighting device. The light sources and the shielding plate are positioned such that light rays from the light sources and received by the associated lens elements reach the lens elements substantially without reflection or deflection. By preventing some deflection and reflection of light from the light sources before reaching the optical elements of the shielding plate, the device ensures that any optical devices necessary to collect and focus light from the light sources are contained within the shielding plate. In other words, the device does not have any optical elements between the light sources and the shielding plate. As such, the device is essentially hollow between the light sources and the shielding plate. Therefore, the overall structure of the lighting device is simplified, making both assembly and maintenance easier. All elements can be fixed to the shell, so no additional mechanical support needs to be provided, which reduces the overall weight and increases durability.

[0006] Each lens element is furthermore a Fresnel lens, comprising a central lens area surrounded by a series of convex prisms arranged concentrically on the light entrance surface of the shielding plate, this structure allowing optimal coupling of light coming from the light source with a light spot created by minimizing the thickness of the plate.

[0007] According to a preferred embodiment, the shielding plate includes at least one filter, which can be realized by surface treatment of the plate to produce a change in the color temperature of the light for medical applications, or to block or transmit specific wavelengths.

[0008] In an advantageous embodiment, the shielding plate has a substantially smooth light exit surface, thus making it easier to clean the shielding plate of the lighting device and reducing the risk of contamination.

[0009] Preferably, the light exit surface of the obscuration plate is substantially concave in shape, which facilitates the alignment of diverging light rays from different light sources and diverging light rays from the optical element onto the same light spot.

[0010] Manufacturing of the shielding plate is facilitated by the preferred embodiment, as the shielding plate consists of several parts that are joined together.

[0011] Preferably, the shielding plate includes a substrate having an outer surface that coincides with the light exit surface of the shielding plate and an inner surface, and at least one lens element is attached to the inner surface of the substrate. Such a structure allows the lens elements to be manufactured individually, further minimizing their cost. This significantly simplifies their manufacture and improves the precision that can be achieved, especially when the lens elements are formed by injection molding.

[0012] When the substrate has a plurality of notches for fixing the lens elements, the assembly of the shielding plate becomes easier.

[0013] In a particularly advantageous embodiment, the shading plate further comprises at least one optical plate disposed between the lens element and the substrate for diffusing or filtering the light. In this way, the lighting device can provide variations in spot size or color temperature without the need for additional optical devices.

[0014] According to a preferred embodiment, the thickness of the shielding plate in the area containing the lens elements is at most 50 mm, preferably at most 25 mm. Furthermore, the distance between the light source and the shielding plate is preferably between 60 mm and 20 mm, more preferably between 50 mm and 20 mm.

[0015] At least one of the lens elements and the occlusion plate is preferably made from PMMA, PC or a combination of these two materials.

[0016] In a particularly advantageous variant, the lighting device comprises an LED light source.

[0017] According to another aspect of the present disclosure, a shielding plate for shielding the above-described surgical lighting device is proposed, the shielding plate including a smooth outer surface adapted to function as a light exit surface and an inner surface, a plurality of lens elements disposed on the inner surface of the plate, each of the lens elements (20) being a Fresnel lens, including a central lens area (201) surrounded by a series of convex prisms (202, 203) arranged concentrically on the inner surface of the shielding plate (18), each lens element configured to collect and focus light from a light source.

[0018] Preferably, the shielding plate further comprises at least one substrate having at least one lens element attached to an inner surface of the substrate.

[0019] According to yet another aspect of the present disclosure, a method for manufacturing a light emitting surface for a surgical lighting device is proposed, the method comprising the steps of providing a substrate having a smooth outer surface adapted to function as a light exit surface and an inner surface; providing a plurality of lens elements adapted to collect and focus light from a light source without substantially reflecting or deflecting it; and fixing the lens elements to the top surface of the substrate.

[0020] Preferably, the method further comprises inserting a light diffusing and / or filtering optical plate between the lens element and the substrate before bonding the lens element to the substrate. Alternatively, the method may comprise the step of texturing the blocking plate to block transmission of certain wavelengths.

[0021] Preferably, the shielding plate so produced is intended for use in the surgical lighting device described above.

[0022] The present disclosure will be better understood and other advantages will appear on reading the detailed description of embodiments given as non-limiting examples illustrated by the attached drawings, in which: The present invention provides, for example, the following. (Item 1) A surgical lighting device including a shell (12) and a plurality of light sources (24) coupled to the shell, the device further comprising a shielding plate (18), the shielding plate (18) being at least partially light transmissive and coupled to the shell and capable of shielding the lighting device (10) by passing light from the light sources, the shielding plate (18) including a plurality of lens elements (20), each of the lens elements (20) being a Fresnel lens, the lens elements (20) being formed by a series of concentric convex prisms (202, 203) arranged on an inner surface of the shielding plate (18). ), each lens element configured to collect and focus light from a corresponding light source to generate an illumination spot of a predetermined diameter located at a predetermined distance from the illumination device, the light sources and the shielding plate are positioned such that light rays coming from the light sources and received by an associated lens element impinge on the lens element substantially without reflection or deflection, and the device is free of optical elements between the light sources and the shielding plate. (Item 2) Item 1, wherein the shielding plate (18) includes at least one filter. (Item 3) 10. The surgical lighting device according to any of the preceding items, wherein the shielding plate (18) has a substantially smooth light exit surface. (Item 4) 10. The surgical lighting device according to any of the preceding items, wherein the light exit surface of the shielding plate (18) is substantially concave in shape. (Item 5) 10. A surgical lighting device according to any of the preceding items, wherein the shielding plate (18) is made up of a plurality of sections (20, 180, 181, 182) joined together. (Item 6) A surgical lighting device as described in any of the preceding items, wherein the shielding plate (18) includes at least one substrate (181) having an outer surface corresponding to the light exit surface of the shielding plate and an inner surface, and at least one lens element (20) is attached to the inner surface of the substrate (181). (Item 7) 7. The surgical lighting device of claim 6, wherein the inner surface of the substrate (181) includes a plurality of notches (182) into which the lens elements (20) are attached. (Item 8) 8. The surgical lighting device of claim 6 or 7, wherein the shielding plate (18) further comprises at least one optical plate (30) disposed between the lens element (20) and the substrate (181) for diffusing and / or filtering the light. (Item 9) 10. A surgical lighting device according to any preceding item, wherein the thickness of the shielding plate in the area including the lens element (20) is at most 50 mm, preferably at most 25 mm. (Item 10) The surgical lighting device according to any of the preceding items, wherein the distance between the light source (24) and the shielding plate (18) is between 60 mm and 20 mm, preferably between 50 mm and 20 mm. (Item 11) 2. The surgical lighting device according to claim 1, wherein at least one of the lens element (20) and the shielding plate (18) is made of PMMA, PC, silicone, or a combination thereof. (Item 12) 1. A surgical lighting device according to the preceding item, comprising an LED light source (10). (Item 13) 10. The surgical lighting device according to claim 1, wherein the device is substantially empty between the light source (10) and the shielding plate (18). (Item 14) 10. The surgical lighting device according to claim 1, wherein all of the optical elements are included in the shielding plate (18). (Item 15) 1. A shielding plate for use in a surgical lighting device (10) according to any of the preceding items, the shielding plate comprising a smooth outer surface adapted to function as a light exit surface and an inner surface, a plurality of lens elements (20) disposed on the inner surface of the plate, each of the lens elements (20) being Fresnel lenses comprising a central lens area (201) surrounded by a series of convex prisms (202, 203) arranged concentrically on the inner surface of the shielding plate (18), each lens element configured to collect and focus light from a light source (24). (Item 16) Item 16. The shielding plate according to item 15, comprising at least one substrate (181) having at least one lens element (20) attached to the inner surface of the substrate (181). (Item 17) Item 17. The shielding plate according to item 16, further comprising at least one optical plate (30) disposed between the lens element (20) and the substrate (181) for diffusing and / or filtering the light. (Item 18) 18. A method for manufacturing a shielding plate for a surgical lighting device according to any one of items 15 to 17, comprising the steps of: providing a substrate having a smooth outer surface suitable for functioning as a light exit surface and an inner surface; providing a plurality of lens elements (20) adapted to collect and focus light from a light source without substantially reflecting or deflecting it; and attaching the lens elements (20) to the inner surface of the substrate. (Item 19) Item 19. The method for manufacturing a shielding plate according to item 18, further comprising the step of sandwiching an optical plate that diffuses and / or filters the light between the lens element and the substrate before bonding. (Item 20) A method for manufacturing a shielding plate according to item 18 or 19, which is used in the surgical lighting device according to any one of items 1 to 14. [Brief explanation of the drawings]

[0023] [Figure 1] 1 shows a schematic diagram of the structure of a surgical lighting device according to the prior art; [Figure 2] 1 is a schematic diagram of a surgical lighting device according to the present disclosure; [Figure 3] 3 shows a schematic cross section of the surgical lighting device of FIG. 2; [Figure 4] 1 shows a schematic representation of lens elements and their functions. [Figure 5] 1 illustrates a schematic representation of a shielding plate, according to one embodiment. [Figure 6] 10 shows a schematic illustration of a shielding plate according to another embodiment; [Figure 7a] 10 shows a partially exploded cross-sectional view of a shielding plate of a lighting device according to another embodiment. [Figure 7b] 7b shows a schematic cross-sectional view of the assembled shielding plate of FIG. [Figure 8] FIG. 10 is a partially exploded cross-sectional view of a shield plate according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0024] FIG. 2 illustrates a surgical lighting device 10 according to the present disclosure. The lighting device 10 may be a headlamp or dome, which may be used alone or in combination with other domes to illuminate a surgical site. The lighting device 10 includes a housing or shell 12, in the illustrated example, mounted on an arm 16. The arm 16 may be secured to an articulated support that fastens to the ceiling or wall of the operating room. The arm may also be mounted to a fixed or movable support that is grounded. The shell 12 has a rear surface (not shown) and continuous sidewalls that extend at an angle relative to the rear surface.

[0025] A handle 14 is secured to a side wall of the shell 12 and extends around part of its periphery. The underside or light-emitting surface of the lighting device 10 is covered by a shielding plate 18 or underside, which allows light to exit the lighting device 10 while protecting it from moisture, dust, etc., allowing for thorough cleaning. Another handle 22 extends from the shell 12 to the center of the light-emitting surface, allowing the device 10 to be operated with one hand.

[0026] As shown in the cross-sectional view of the lighting device 10 in FIG. 3 , the shell 12 defines an interior space between the rear wall and the side wall for housing light sources and any associated circuitry, heat sinks, or other components. The shielding plate 18 is provided with several lens elements 20. Preferably, each lens element 20 is positioned to collect and focus light from a corresponding single light source 24. For clarity, only two of the light sources 24 are shown in FIG. 3 , aligned with the lens elements 20 of the shielding plate 18. In practice, the lighting device 10 would include as many light sources 24 as there are lens elements 20, i.e., nine light sources and lens elements in the device shown in FIG. 1 . The light sources 24 shown in FIG. 3 are preferably “chip-on-board” (COB) type LEDs, although other types of LEDs and even other light sources may be used. In the example shown, each of the LED light sources 24 is held in place against the interior wall of the shell 12 using a connector, not shown. Other mounting means are also possible. As shown in the figures, the shell 12 may be provided with convex pads 26 that position and orient the light source 24 and provide a thermal connection to the shell body 12 to facilitate heat dissipation. The shielding plate 18 may be secured to the shell 12 by clips or screws, for example, using the central handle 22 or by fitting connecting posts. Once attached, the outer edge of the shielding plate 18 seals the edge of the shell 12 to protect against moisture and dust. An additional gasket may be used to improve this seal.

[0027] FIG. 4 is a cross-sectional view of a lens element 20 according to one embodiment of a lighting device. The lens element 20 is substantially circular in shape, with a central area 201 comprising a raised, substantially convex lens. Prismatic structures or teeth are concentrically arranged around this central zone 201, each having an entrance surface 202 and a reflection surface 203 that are angled relative to one another. In the illustrated embodiment, the entrance surface is planar, while the reflection surface 203 is a curved, complex surface. The entrance surface may also be curved. In the illustrated figure, four prisms or concentric teeth are provided, but more or fewer teeth can be used. The central zone 201 and teeth 202 are configured to collect different portions of the light beam emitted by the light source. This is shown schematically in the figure. Each portion of the emitted beam enters the lens element 20 at a different location. The central portion of the beam emitted by the light source 24 passes through the central zone of the lens 201 and converges toward a designated point at a predetermined distance from the lens. Gradually, more and more of the branching sections of the emitted light are coupled into one of the teeth's entrance surfaces 202, where the emitted light is refracted and then reflected off the reflecting surface 203 to the same designated point. All beams exit the lens element 20 through a common exit surface 204 and overlap at a focal point. The exit surface 204 is flat or slightly concave, which allows for better directing of the light to the designated light spot. This structure, combining a central lens surrounded by concentric teeth, allows the lens element 20 to collect the maximum amount of light from the light source 24 and converge the light at a predetermined focal area with a minimum footprint. Thus, the lens element 20 performs the same function as the combined lens, collimator, and reflector found in conventional surgical lighting devices. The lens element 20 can be or comprise a Fresnel lens.

[0028] The light collection efficiency of each lens element 20 depends in part on the thickness of the lens element 20, particularly the height of the teeth 202. The light collection efficiency also varies depending on the diameter of the lens element, the distance between the lens element 20 and the associated light source 24, and the size of the LED's emitting surface, when used. Regarding the thickness of the lens 20, it is observed that as the teeth 202 become taller, particularly toward the outer edge of the lens, more emitted light may be collected. However, this comes at the expense of a smaller light spot diameter. In many configurations of the lighting device 10, the light-transmitting area of ​​the shielding plate 18, i.e., the area including the optical elements 20, has a maximum thickness of 50 mm or less, and in some configurations, a maximum thickness of 25 mm or less. Regarding the distance between the light source 24 and the highest point of the shielding plate 18, some variations have a maximum distance of 60 mm, while other variations have a maximum distance of 20 mm. A preferred distance is between 20 mm and 50 mm.

[0029] From the illumination device shown in FIG. 3, it is clear that by incorporating all the optical elements necessary to collect and focus light onto the shielding plate, the overall structure of the illumination device is significantly simplified. All elements can be attached directly to the shell 12. Therefore, there is no need to provide intervening mechanical support for the various elements. Therefore, assembly of the device is also significantly simplified. The overall weight of the instrument can also be significantly reduced. Furthermore, a space is provided between the light sources 24 and the lens elements 20. In some embodiments, this space can remain empty or be substantially empty. In other embodiments, this space can be used to insert a diffuser plate to change the light spot diameter. For example, a diffuser plate can be inserted in front of a portion of the lens elements 20, and the light spot diameter can be changed by varying the current supplied to the LED light sources 24. Similarly, a light filter plate can be sandwiched between one or more of the light sources 24 and the corresponding lens elements 20 to vary the color temperature of the light spot or to cut off specific wavelength zones depending on the surgeon's needs.

[0030] FIG. 5 schematically illustrates a shielding plate 18 according to one embodiment of the lighting device 10. The shielding plate 18 includes several lens elements 20 arranged at predetermined locations on the surface of the shell 12 corresponding to the positions of the light sources 24. The shielding plate is made of a substantially transparent material, such as PMMA (polymethyl methacrylate), PC (polycarbonate), silicone, or other suitable material. Preferably, the shielding plate is manufactured by injection molding and formed integrally. The shielding plate may also be made of a different material. In some variations, the non-light-emitting areas of the shielding plate 18, i.e., areas without lens elements 20, may be less transparent or even substantially light-blocking. This may be achieved by applying a coating. The bottom surface of the shielding plate 18 shown in the figure forms the outer surface when mounted on the lighting device 1. This side is preferably smooth, allowing for non-transparent shielding for the lighting device. This surface may also be flat or curved, e.g., concave. Posts 28 are provided on the top surface of the shield plate 18 to enable the shield plate 18 to be secured to the shell 12 by screws or the like. Other attachment means, such as clips, may be provided to attach the shield plate to the edge of the shell or to the handle 22.

[0031] In the example shown, the shell 12 and the shielding plate 18 have an essentially circular shape. However, it is recognized that the apparatus according to the invention can be applied to lighting devices of various shapes and structures, including structures consisting of several shell or housing parts. Thus, the shielding plate 18 can take on different shapes or be provided in several parts depending on the shape of the lighting device.

[0032] 6 shows another variant of the shielding plate 18. In this arrangement, the shielding plate consists of several parts or sectors 180, three in the example shown, which can then be glued together to ensure water and dust proofing. Making the shielding plate 18 in several parts facilitates the injection molding process and thus reduces costs. At the same time, the precision of production can be improved, making it possible in particular to make the shielding plate in order to obtain a smaller clearance angle for the lens element 20.

[0033] 7a and 7b show a shielding plate 18 according to another embodiment. In this configuration, the shielding plate 18 consists of a substrate 181 with a smooth underside and notches or locations 182 for accommodating various lens elements 20. The lenses 20 are then attached to the substrate 181 by ultrasonic or other similar means. This arrangement offers the advantage that the injection molding of the substrate and the lens elements 20 can be performed separately. This improves the precision of the lenses, since it is possible to obtain smaller prism angles. As shown in FIG. 7b, the lens elements 20 can be provided with flat or slightly concave exit faces to avoid impacting the smooth underside of the shielding plate 18. The substrate 181 and the lens elements 20 can also be made of different materials. For example, the lenses 20 can be PMMA, while the substrate 181 is PC. Furthermore, it is conceivable that the substrate can consist of several parts that are then glued together to form the final structure.

[0034] The structure consisting of the shielding plate shown in Figures 7a and 7b can be further modified as shown in Figure 8. In this arrangement, another optical plate 30 is sandwiched between the lens elements 20 and the substrate 181. The optical plate 30 can be a diffuser plate that increases the diameter of the generated light spot. The optical plate 30 can also be a filter that allows modifying the color temperature of the light or absorbing wavelength bands for specific applications. By sandwiching a diffuser plate or filter 30 between specific individual lens elements 20 and the substrate 181 and then being able to control the power supply to individual light sources 24, the lighting device can be used to provide different light spot diameters or different light temperatures in an adjustable manner.

[0035] In another variation of the device, one or more filters may be incorporated into the shielding plate by means of the surface treatment of the plate 18 or one or more lens elements 20 . [Explanation of symbols]

[0036] 1 halogen bulb 2 Convex reflector 3. Condenser lens 4. Filters 5 Prismatic diffuser / deflector 6 Bottom side 10. Lighting Devices 12 shells 14 Handle 16 Arm 18 Shield plate 180 Shielding Sector 181 PCB 182 places / notches 20 Lens Elements 22 Sterile Handle 24 Light source 26 pads 201 central area of ​​lens element 202 Prism entrance surface 203 Prismatic Reflecting Surface 204 Lens element exit surface 28 Posts 30 Optical plate

Claims

1. A surgical lighting device, comprising: A shell (12); a plurality of light sources (24) coupled to the shell; a shielding plate (18) that is at least partially light-transmitting; Equipped with The shielding plate is coupled to the shell to shield the surgical lighting device by passing light from the plurality of light sources, the shielding plate including at least one substrate (181) and a plurality of lens elements (20), the plurality of lens elements being separate from and attached to the at least one substrate, each lens element (20) being a Fresnel lens, each Fresnel lens including a central lens area (201) surrounded by a series of convex teeth (202, 203) concentrically arranged on an inner surface of the shielding plate, each lens element collecting and projecting light from a corresponding light source (24). and a plurality of substrates, the plurality of substrates being configured to converge and converge to produce an illumination spot of a predetermined diameter located a predetermined distance from the surgical lighting device; the plurality of light sources and the shielding plate being positioned such that light rays from the plurality of light sources impinge on the plurality of lens elements substantially without reflection or deflection; the surgical lighting device lacking any optical elements between the plurality of light sources and the shielding plate; the at least one substrate having an outer surface corresponding to a light output surface of the shielding plate and an inner surface, the inner surface of the at least one substrate further including a plurality of notches (182) in which the plurality of lens elements are mounted.

2. A surgical lighting device, comprising: A shell (12); a plurality of light sources (24) coupled to the shell; a shielding plate (18) that is at least partially light-transmitting; Equipped with The shielding plate is coupled to the shell to shield the surgical lighting device by passing light from the plurality of light sources, the shielding plate including at least one substrate (181) and a plurality of lens elements (20), the plurality of lens elements being separate from the at least one substrate and attached to the at least one substrate, each lens element (20) being a Fresnel lens, each Fresnel lens including a central lens area (201) surrounded by a series of convex teeth (202, 203) concentrically arranged on an inner surface of the shielding plate, the central lens area (201) of each lens element (20) being raised and substantially convex to define the central lens area. a Fresnel lens configured to focus light passing through the Fresnel lens at a designated point a predetermined distance from the Fresnel lens, each tooth including an incident surface (202) and a reflective surface (203) that are curved such that all light rays reflected from the reflective surface overlap at the same designated point; each lens element (20) configured to collect and focus light from a corresponding light source (24) to generate a light spot of a predetermined diameter located a predetermined distance from the surgical lighting device; the light sources and the shielding plate are positioned such that light rays from the light sources impinge on the lens elements without being substantially reflected or deflected; and the surgical lighting device lacks any optical elements between the light sources and the shielding plate.

3. The surgical lighting device of claim 1 or 2, wherein the shielding plate includes at least one filter.

4. The surgical lighting device according to any one of claims 1 to 3, wherein the shielding plate has a substantially smooth light exit surface.

5. The surgical lighting device according to any one of claims 1 to 4, wherein the light exit surface of the shielding plate is substantially concave in shape.

6. 6. The surgical lighting device of claim 1, wherein the shielding plate is made up of multiple parts joined together, the multiple parts including the multiple lens elements and the at least one substrate.

7. 10. The surgical lighting device of claim 1, wherein the shielding plate further comprises at least one optical plate (30) disposed between the plurality of lens elements and the at least one substrate for diffusing and / or filtering the light.

8. The surgical lighting device according to any one of claims 1 to 7, wherein the thickness of the shielding plate in the area including the plurality of lens elements is at most 50 mm.

9. A surgical lighting device as described in Claim 8, wherein the thickness of the shielding plate within the area including the plurality of lens elements is at most 25 mm.

10. The surgical lighting device of any one of claims 1 to 9, wherein the distance between the plurality of light sources and the shielding plate is between 60 mm and 20 mm.

11. A surgical lighting device as described in claim 10, wherein the distance between the multiple light sources and the shielding plate is between 50 mm and 20 mm.

12. The surgical lighting device of any one of claims 1 to 11, wherein at least one of the plurality of lens elements and the shielding plate is made of PMMA, PC, silicone, or a combination thereof.

13. A surgical lighting device as described in any one of claims 1 to 12, wherein the surgical lighting device includes an LED light source.

14. The surgical lighting device according to any one of claims 1 to 13, wherein the surgical lighting device has a substantial hollow space between the plurality of light sources and the shielding plate.

15. A surgical lighting device as described in any one of claims 1 to 14, wherein all optical elements are contained within the shielding plate, and all optical elements include the plurality of lens elements and at least one optical plate (30) installed between the plurality of lens elements and the at least one substrate of the shielding plate.

16. A surgical lighting device as described in any one of claims 1 to 15, further comprising a central handle extending from the shell to the center of the shielding plate, the central handle further extending outward from the center of the shielding plate.

17. A surgical lighting device as described in any one of claims 1 to 16, wherein the shielding plate consists of a plurality of shielding plate sectors (180), which are glued together to ensure water and dust resistance.

18. A shielding plate for use in a surgical lighting device according to any one of claims 1 to 17, said shielding plate being for shielding said surgical lighting device, said shielding plate comprising at least one substrate (181) and a plurality of lens elements (20), said plurality of lens elements being provided separately from and attached to said at least one substrate, said at least one substrate having a smooth outer surface adapted to function as a light exit surface and an inner surface, said plurality of lens elements is disposed on the inner surface of the at least one substrate, the inner surface of the at least one substrate further comprising a plurality of notches (182), the plurality of notches having the plurality of lens elements mounted therein, each lens element (20) being a Fresnel lens, each Fresnel lens including a central lens area (201) surrounded by a series of convex teeth (202, 203) concentrically arranged on the inner surface of the shielding plate, each lens element configured to collect and focus light from a light source (24).

19. A shielding plate as described in Claim 18, wherein the shielding plate includes at least one optical plate (30) positioned between the plurality of lens elements and the at least one substrate to diffuse and / or filter the light.

20. A method for manufacturing a shielding plate for a surgical lighting device according to claim 18 or claim 19, comprising: providing a substrate having a smooth outer surface suitable to function as a light exit surface and an inner surface; providing a plurality of lens elements (20) adapted to collect and focus light from a light source without substantially reflecting or deflecting it; attaching the plurality of lens elements to the inner surface of the substrate; A method for manufacturing a shielding plate, comprising:

21. A method for manufacturing a shielding plate as described in claim 20, further comprising a step of sandwiching an optical plate that diffuses and / or filters the light between the plurality of lens elements and the substrate before attaching the plurality of lens elements to the inner surface of the substrate.

22. A method for manufacturing the shielding plate according to claim 20 or claim 21, which is used in the surgical lighting device according to any one of claims 1 to 17.

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