Surgical lighting devices

Abstract

The present disclosure relates to a surgical lighting device for generating a spot of light at a surgical site for use in combination with a fluorescence imaging device. The lighting device (1) includes a support structure (2), a lower surface (7) coupled to the support structure (2) and capable of sealing the lower surface of the device while allowing light to pass through, and a plurality of light sources (10) emitting white light and positioned between the support structure (2) and the lower surface (7). The device further includes a plurality of NIR (near-infrared) filters (18), each associated with a light source (10) and configured to substantially prevent transmission of wavelengths within a wavelength band of 680 nm to 900 nm while minimizing a change in the color temperature of the light spot.

Description

[Technical field]

[0001] The present disclosure relates to a surgical illumination device for use with a fluorescence medical imaging system.

[0002] Prior Art Fluorescence medical imaging is a technique used during surgery to help the surgeon locate the target organ or tissue of the patient. The technique consists of illuminating the area of ​​interest with an excitation wavelength designed to make certain molecules fluoresce. In general, the light emitted by the molecules has a slightly longer wavelength than the excitation light. The molecules can be injected into the patient beforehand as fluorescent markers. With an excitation light of the appropriate wavelength, endogenous molecules, i.e. molecules naturally present in the organism, can also be made to fluoresce depending on the metabolic state of the tissue. This last technique is called autofluorescence.

[0003] Nowadays, fluorescence medical imaging is widespread and many devices are available on the market. Generally, these devices work in the near-infrared wavelength range, i.e. both the excitation light and the detection light are in the wavelength range of 700nm-900nm. The fluorescence intensity is relatively weak. Therefore, it is important to minimize stray light at the detected wavelength.

[0004] Operating rooms are usually equipped with surgical lighting that comply with recognized standards that define the characteristics of the emitted light. For example, the NF EN60601-2-41 standard specifically requires that surgical lighting emits white light with a color temperature (Tk) between 3000K and 6700K and a typical color rendering index (CRI) (or Ra) of at least 85. In addition, a suitable R9 must be available. The color temperature and CRI of the emitted light are important to allow the surgeon to see the shades correctly while reducing eye strain. Partly because of these constraints, most light sources used in surgical lighting partially emit light in the wavelength range detected by fluorescence medical imaging devices. For this reason, it is common to switch off the surgical lighting when using fluorescence medical imaging devices in order not to interfere with the detection of the fluorescence signal or to operate in a way that does not further illuminate the area of ​​interest.

[0005] FR2989876 describes a fluorescent medical imaging system for use in an operating room in which both the surgical lighting and the imaging detector are equipped with filters, allowing the surgical lighting to remain directed at the area of ​​interest during the fluorescent imaging operation without interfering with the fluorescence detection. The surgical lighting filter is attached to the outside of the lamp and covers its entire surface, i.e., approximately 0.5 m. 2 The filter covers the area of ​​​​the fluorescent light. The authors realized that it would be prohibitively expensive to manufacture a filter of this size with the necessary precision. Therefore, the filter does not exclude all light in the area of ​​​​the fluorescent image. For this reason, it was necessary to pair this filter with an additional filter of the fluorescent imaging detector to avoid interference. Therefore, such an arrangement is only possible with the use of a suitable detector. Moreover, the detector filter necessarily attenuates the detectable signal. Moreover, the attachment of such a filter to the surgical lighting device is bound to be complicated, since the surgical light must have a surface that can be efficiently and easily cleaned. Summary of the Invention

[0006] The objective of the present disclosure is to alleviate the problems associated with the prior art, and more specifically to propose a surgical illumination device that can continue to operate to provide visible white light when a fluorescent medical imaging device is used, without interfering with the detected fluorescent signal. The present disclosure also aims to provide a surgical illumination device that can be operable during fluorescent medical imaging, regardless of the imaging device used.

[0007] This and other objects are achieved in a surgical lighting device for generating a light spot at a surgical site for use in combination with a fluorescent image capture device, wherein the lighting device comprises a support structure, a lower surface coupled to the support structure and capable of sealing the lower surface of the device while allowing light to pass therethrough, a plurality of light sources disposed between the support structure and the lower surface capable of emitting white light, the device further comprising a plurality of NIR filters, each NIR filter associated with a light source and configured to substantially prevent transmission of wavelengths within a wavelength band of about 680 nm to 900 nm while minimizing a change in color temperature of the light spot. Each NIR filter is also configured to move between an operative position disposed in front of the light source to filter light emitted from the light source and an inoperative position in which light coming from the light source cannot be filtered. The device further comprises a control unit configured to control movement of the plurality of NIR filters between the operative and inoperative positions, and means for receiving a signal from the fluorescent image capture device, the control unit configured to control movement of the NIR filters between the operative and inoperative positions based on a signal indicating that the fluorescent image capture device has been activated or as a function of a signal received from the fluorescent image capture device.

[0008] By providing multiple NIR filters, i.e., filters each suppressing the transmission of wavelengths of near infrared light associated with the light source, the size of the filters can be maintained at a reduced level, thus improving the accuracy of the filters to effectively block stray light in the near infrared range at a reasonable cost. Thus, the device can be used with commercially available fluorescent imaging devices without the need for additional modifications. Encapsulating the filters in a sealed illumination device makes the device even easier to clean. Since any filtering of light will result in some change in the color temperature of the light spot, this controlled positioning of the filters allows the surgeon to select the light that best suits his needs. Furthermore, automatic control of the filter position using a signal indicating the status of the fluorescent imaging device makes the actuation of the filters much easier, while still ensuring optimal illumination, whether based on the operational characteristics of the fluorescent imaging or not.

[0009] Preferably, the device includes a plurality of optical elements configured to collect, focus and / or concentrate light from said light source, and the plurality of NIR filters are disposed at at least one of the following locations: between the light source and the optical elements, on a surface of the optical elements facing the light source, on a surface of the optical elements facing away from the light source, between the optical elements and the bottom surface, and on a surface of the bottom surface. Thus, the filters can be attached to any surgical lighting device, regardless of configuration.

[0010] In advantageous embodiments, the NIR filter is included on the underside or within the optical element. This can be achieved by adding one or more thin layers to the underlying element, by surface treatment of this element, or by bonding to the underlying element a separate optical component that has the required absorption characteristics in the near infrared wavelength range.

[0011] According to an advantageous embodiment, the control unit is configured to communicate with a control panel, the control unit being configured to control the movement of the NIR filter between the activated and deactivated positions according to signals from the control panel. The control panel can be attached to the lighting device, for example fixed to the outside of the support structure, i.e. to the housing of the device. Alternatively, the control unit can be configured for wired or wireless communication with the control panel to allow remote control of the filter position.

[0012] In a particularly advantageous configuration, multiple NIR filters are arranged on a rotating disk, the rotation of which is controlled by the control unit. For example, multiple NIR filters can be arranged on a rotating disk with empty spaces alternating with other optical elements or NIR filters. In some cases, the operative positions correspond to the alignment of multiple light sources with NIR filters on the rotating disk, and the non-operative positions correspond to the alignment of light sources with other optical elements or empty spaces on the optical disk. In this way, multiple filters can be activated or deactivated in one operation.

[0013] Preferably, the rotating disc is rotated automatically to place the illumination device in the operational configuration based on a signal indicating that the fluorescent imaging device is activated.

[0014] In a preferred embodiment, each NIR filter has a maximum transmittance of 0.5% or less, preferably 0.1%, more preferably 0.01%, in the substantially blocked wavelength band, and a transmittance of 85% or more from 400 nm to the substantially blocked wavelength.

[0015] In a particularly advantageous embodiment, when a NIR filter is in front of each light source, the illumination device provides a central illumination (Ec) of at least 40,000 lux at the center of the light spot 1 meter from the face of the surgical lighting output, while also providing a transmittance of no more than 0.5%, preferably no more than 0.1%, and more preferably no more than 0.01%, in a wavelength band of at least 50 nm between wavelengths of 680 nm and 900 nm.

[0016] Preferably, the light source of the surgical lighting device comprises at least one LED.

[0017] In a particular embodiment, a lighting device with a maximum central illumination (Ec) of 160K lux can provide a maximum of 1000mW / m 2 The irradiance in the wavelength band from 700 nm to 750 nm is

[0018] In a particular embodiment, a lighting device with a maximum central illumination (Ec) of 160K lux can emit up to 100 mW / m 2 , and preferably up to 500 mW / m 2 The irradiance in the wavelength band from 750 nm to 850 nm is

[0019] According to another embodiment, a surgical lighting device for generating a spot of light at a surgical site for use in combination with a fluorescence imaging device is proposed, the lighting device comprising a support structure, a bottom surface coupled to the support structure and capable of sealing the bottom surface of the device while allowing the passage of the light sources, and a plurality of light sources emitting white light and disposed between the support structure and the bottom surface, the device further comprising a plurality of NIR filters, each NIR filter being associated with a light source and configured to substantially prevent transmission of wavelengths within a wavelength band of 680-900 nm while minimizing color temperature changes in the light spot, such that the lighting device having a maximum central illumination (Ec) of 160 K lux can achieve a maximum illumination of up to 1000 mW / m 2 It has irradiance in the wavelength band of 700 nm to 750 nm.

[0020] It is understood that the different embodiments described above can be combined with each other.

[0021] The present disclosure will be better understood and other advantages will become apparent on reading the detailed description of embodiments given by way of non-limiting example and illustrated by the accompanying drawings, in which: [Brief description of the drawings]

[0022] [Figure 1] 1 shows a lighting device according to the present disclosure. [Diagram 2] FIG. 1 is a diagram showing the emission spectrum of a white LED. [Diagram 3] 2A-2C are schematic diagrams illustrating possible positions of filters in the surgical lighting device of FIG. 1; [Figure 4] 2 shows a partial cross-sectional view of the lighting device through plane AA of FIG. 1. [Diagram 5] 1 illustrates a schematic representation of a filter disk according to one embodiment. [Figure 6] FIG. 4 is a functional diagram showing control of the lighting device. [Figure 7] 3 shows a schematic transmission curve of the NIR filter of the lighting device of FIGS. 1 and 2 according to a preferred embodiment; [Figure 8] 1 illustrates a schematic of power illumination of a surgical illumination device with and without a NIR filter. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] In the drawings, the same reference numbers are used for the same elements.

[0024] FIG. 1 shows a surgical lighting device 1 according to the present disclosure. The illustrated lighting device 1 is a lamp head, which may be used in a surgical lighting assembly together with other lamp heads or alone. The surgical lighting device 1 has a shell or housing 2 forming the rear of the lamp head. The housing, alone or together with other structural elements, serves as a support structure 2 for the various optical and electronic elements of the lighting device. The housing 2 may be coupled to an articulating arm 8 allowing for suspension from the ceiling of the operating room. It may also be coupled to a moving or fixed support. The housing 2 is substantially dome-shaped, with an invisible rear face and a rim 3 extending perpendicularly to this rear face, housing the various optical and electrical elements for generating light. A laterally extending handle 4 for operation and positioning of the lighting device 1 is connected to the rim. A control panel 5 in the form of a keyboard, touch screen, or the like is attached to the handle 4 for controlling the various functions of the lighting device, as will be described below. It should be noted that the handle 5 may take different forms or be omitted entirely. Also, the control panel 5, if present, may be located on the case or on a separate controller. The lighting device 1 further comprises an at least partially transparent cover or underside 7 for the passage of light, which fits into the underside of the housing 2 in watertight contact with the rim 3 and forms a surface for light emission from the lighting device. A sterile tubular handle 6 may also be provided on the underside of the lighting device, substantially in the middle or to the side of this light-emitting surface, to allow operation of the device with one hand.

[0025] Although the housing 2 and the lower surface 7 are shown to have an essentially circular cross section, it will be understood that this is merely exemplary. The lighting device 1 can be adapted for lamps of various shapes and configurations, including a cross shape or another branched shape.

[0026] Fluorescence imaging is used during surgery to help surgeons identify specific structures and tissues. Fluorescence imaging devices may be handheld or mounted on a stand or similar in the operating room. The device works by emitting light to induce fluorescence in molecules in the body. Often, molecules are labeled by first injecting the label into the patient, but some natural or endogenous molecules may fluoresce under the appropriate excitation light. The wavelengths of light emitted and detected by fluorescence imaging devices are often in the near infrared range, with the excitation light typically emitted at wavelengths between about 700-800 nm and the fluorescence detected at higher wavelengths of about 20-80 nm.

[0027] The light source used in the surgical lighting device should preferably be capable of producing white light according to the applicable standards. For example, the NF EN60601-2-41 standard requires that the surgical lighting emits white light with a color temperature (Tk) between 3000K and 6700K and a typical color rendering index (CRI) of 85 or higher. Although halogen light sources have been used for surgical lighting, LEDs are more commonly used today due to their higher efficiency and lower heat dissipation. Figure 2 shows a typical emission spectrum of a white LED suitable for a surgical lamp, showing the relative intensity I emitted by the LED as a function of wavelength λ. From this emission spectrum, it is clear that the emitted light extends into the near infrared region, especially overlapping with the operating wavelength region of the fluorescence imaging device. The fluorescence intensity is relatively weak. This light is therefore sufficient to seriously interfere with the fluorescence detection when used in combination with the light of the fluorescence imaging device. It should be noted that the focusing and / or collection optics as well as the bottom surface are substantially transparent to radiation with wavelengths from visible to near infrared, so that the spectrum of the light spot at 1 meter of the lighting layout resembles the LED spectrum, but with reduced intensity. However, the intensity of the near infrared wavelengths is more than enough to prevent detection of fluorescent lamps.

[0028] To avoid this interference while still allowing the use of the surgical illumination device during the operation of the fluorescent medical imaging device, it is proposed to filter the light emitted by each light source using filters designed to block wavelengths at least in the near infrared range while ensuring that the transmitted white light meets standard color temperature and color rendering index (CRI) requirements. In particular, the filters can ensure a spectral irradiance in the field illuminated by the surgical illumination device that is less than near infrared, more specifically the wavelengths used by the fluorescent medical imaging device, i.e., about 0.1 W / m2 / nm. In this disclosure, these filters are referred to as NIR filters.

[0029] FIG. 3 shows a schematic diagram of a part of a surgical lighting device with a NIR filter. In FIG. 3, a light source 10 and an optical element 14 arranged and configured to collect and concentrate the light emitted by the light source 10 and the lower surface 7 are shown. The NIR filter can be arranged in different positions of the device. These positions are indicated by Roman numerals I to V in the figure. More precisely, the NIR filter can be arranged between the light source 10 and the optical element 14, designated by position I. The NIR filter can be arranged either at the input surface II or at the output surface III of the optical element 14. In this case, the NIR filter can be obtained by surface treatment of the optical element 14. The NIR filter can be arranged between the optical element 14 at position IV and the lower surface 7. Finally, the NIR filter can be formed on the surface of the lower surface, for example by surface treatment of the lower surface as indicated by position V. The arrangement of the NIR filtering means in the surgical lighting, adapted to filter the light from a single light source, allows each filter to be very small. This allows the use of more precise manufacturing methods and thus the production of more precise filters at significantly reduced costs.

[0030] FIG. 4 shows a partial cross-sectional view of the interior of the lighting device 1 through the plane AA of FIG. 1. FIG. 4 shows two light sources 10, which are mounted inside the housing 2 by connectors 12, which are in turn fixed to the housing 2. The connectors 12 can be part of one or more larger structural elements adapted to hold the various optical and / or electronic elements in place. It is also possible for the light sources and the associated optical components and circuitry to be mounted directly on the housing. To accommodate all possible modalities, the housing and any structural members considered to be part of the support structure in this disclosure are collectively referred to in this disclosure as the support structure 2. The light sources 10 can be of any type, but are preferably LED light sources. Above each light source there is an optical element 14 in the form of a collimator, known per se to direct the light beam of the light source into the illumination field. The optical element 14 is also fixed to the housing by suitable means, either directly or via a connector. Other structures such as a radiator (heat sink) or light source control circuitry may also be present, but are not shown here. An intervening filtering means, arranged between the optical element 14 and the lower surface 7, is in the form of a disk 16 rotatably mounted on the shaft 20 of the motor 22. Filter disk 16 may be made of a substantially transparent material, and filter element 18 is positioned to coincide with the location of light source 10. Motor 22 is controlled by control unit 24 to rotate, thus bringing filter element 18 into an operative position above light source 10, or moving filter element 18 into a non-operative position away from light source 10.

[0031] The filter disk 16 may optionally include open spaces or alternative optical elements other than the NIR filter elements (not shown) aligned with the light source 10 in the non-operated position. The open spaces or alternative optical elements may be arranged alternately with the NIR filter elements 18 on the filter disk 16. In such an arrangement, the disk 16 may be partially or substantially opaque in areas located outside the light transmitting areas.

[0032] It will be appreciated that one or more filter disks 16 may be positioned between the light source 10 and the optical element 14, i.e., position I in FIG. 3. The NIR filter 18 ensures that the spot of light produced complies with applicable standards for surgical lighting, but may still change the color temperature of the light. The surgeon can selectively activate or deactivate the filtering element 18, thus selecting the lighting most appropriate for the surgeon's needs.

[0033] FIG. 5 shows a plan view of a filter disk 16 with four filter elements 18, each arranged to filter light from one of the four light sources 10 that can be perceived through the filter element 18. The filter disk 16 is essentially circular, although other shapes are possible. It will be understood that the filter disk may further include more or fewer filter elements 18 and thus be arranged over more or fewer light sources 10, depending on the particular construction of the lighting device. To allow filtering of several light sources, several filter disks 16 can be arranged in the same lighting device 1. For example, in the lamp head shown in FIG. 1 with a total of 16 light sources, four filter disks 16 can be arranged and controlled collectively.

[0034] FIG. 6 is a block diagram showing the control of the NIR filter 18. The control unit 24 is connected to a motor 22 that drives the shaft 20 to rotate the filter disk 16 between the operative and inoperative positions. The control unit 24 is connected to a control panel 5 (FIG. 1) and receives manual commands via the control panel 5, but can also transmit information for display. The control panel 5 can also be configured for contactless operation, for example by voice commands. The control unit 24 can control other functions of the lighting installation, including switching on and off. The functions of the lighting device can additionally or alternatively be controlled by a remote control device that communicates wirelessly with the lighting device 1. The control unit 24 is further connected to a control module input / output (I / O) 26 that can receive signals from an external device. These signals can be received, for example, via an antenna 28, infrared or another suitable interface, via a wired or wireless connection. In this way, a fluorescent medical imaging device can be coupled to the lighting device 1 to enable automatic deployment of the filter element 18 by the control unit 24 when the imaging device is activated. To ensure that the surgical field is free of stray light when using the fluorescent medical imaging device, the illumination device can also generate signals for controlling all other light sources in the operating room via the control unit 24 or by a remote control device. Such signals can also be generated in response to a signal from the fluorescent imaging device, so that activation of the imaging device automatically triggers both the deployment of filters in the operating position of the device and the surgical light 1 and the simultaneous switching off of all other lights in the operating room.

[0035] FIG. 7 shows the transmission curve of an example of a NIR filter mounted on a surgical lighting device of the present disclosure. The filter is characterized by a transmittance of 85% or more at wavelengths between 400 nm and 710 nm, a transmittance of 50% at 730 nm, and a transmittance of 0.01% or less at 740 nm to 900 nm at an incidence angle of 30°. Experiments using the filter in various surgical lighting configurations have yielded light spots with correlated color temperatures of about 5100 K and color rendering indexes of 93 to 95. More generally, the NIR filter preferably blocks light having wavelengths equal to or greater than a cutoff wavelength, which cutoff wavelength is preferably in the range of 680 nm to 740 nm. Preferably, light blocking is understood to mean a transmittance of 0.5% or less, more preferably 0.1% or less, and even more preferably 0.01% or less. Furthermore, the filter can block light having a wavelength range extending from the cutoff wavelength to at least 50 nm, preferably at least 100 nm, and more preferably at least 200 nm. The filter further has a transmission of 85% or more for visible light, i.e., wavelengths ranging from 400 nm to the cutoff wavelength. In a preferred embodiment, at 1 meter from the exit surface of the surgical light, the maximum central illumination (Ec) is at least 40,000 lux or at least 60,000 lux at the center of the light spot while providing a transmission of 0.5% or less, or 0.1% or less, or 0.01% or less than the cutoff wavelengths mentioned above.

[0036] Figure 8 represents a graph showing the spectral irradiance of a luminaire with an improved NIR filter (curve A) and a luminaire without a filter (curve B). In both cases, the spectral irradiance of the luminaire was measured using a JETI Specbos1211 type spectrometer (calibrated and COFRAC certified) configured to measure the spectral irradiance at the center of the light spot at a distance of 1 m from the device for the wavelengths of interest. Values ​​are normalized to the maximum central illumination of the device of 160 K lux. The device without a filter shows significant irradiance at wavelengths above 720 nm, with a spectral irradiance of about 60 mW / m at 800 nm. 2On the other hand, the device with the NIR filter shows almost complete suppression of the emission power at wavelengths above 720 nm, and approximately 120 mW / m at 700 nm. 2 Achieve a spectral irradiance of

[0037] However, when considering the effect of irradiance on fluorescence detection, it is more useful to refer to spectral irradiance, i.e., the total irradiance emitted in the wavelength band of interest, rather than the irradiance at individual wavelengths. The following table shows the sum of the spectral irradiance values ​​measured in various wavelength bands.

[0038] [Table 1]

[0039] More generally, a luminaire with a maximum central illumination (Ec) of 160K lux will have a maximum of 1000mW / m2 for the wavelength band from 700nm to 750nm. 2 , preferably up to 800mW / m 2 Preferably, the lighting device has a maximum irradiance of 100 mW / m2 for the wavelength band of 710 nm to 750 nm, and a maximum irradiance of 100 mW / m2 for the wavelength band of 750 nm to 850 nm. 2 , more preferably up to 50mW / m 2 , has.

[0040] The filter element 18 may be of any suitable material, including but not limited to plastic, silicone, glass, or combinations thereof, and may be of the dichroic or absorptive type. The filter element may be manufactured by surface treatment of the material, including but not limited to sol-gel processes, application of an absorptive powder during material infusion, and deposition of a thin layer under vacuum. The filter element 18 may also be formed as a separate optical element in the form of a plate or disk that is glued or otherwise secured to the lower surface 7 or optical element 14.

[0041] The specific features described above are merely variations of a non-limiting nature, and all features referred to herein are contemplated and disclosed in their various possible combinations and subcombinations, as would be understood by one of ordinary skill in the art. [Explanation of symbols]

[0042] 1 Surgical lighting device 2 Housing / support structure 3 Rims 4 Handle 5. Control Panel 6 Sterile Handles 7 Cover / bottom surface 8 Articulated Arm 10 light source 12 Connectors 14 Optical elements 16 Filter Discs 18 Filters 20 Shaft 22 Motor 24 Control Unit 26 I / O Modules 28 Antenna

Claims

1. A surgical illumination device (1) for generating a light spot at a surgical site for use in combination with a fluorescence image capture device, the illumination device (1) comprising: a support structure (2); a lower surface (7) that can be coupled to the support structure (2) to seal the lower surface of the illumination device while allowing light to pass therethrough; and a plurality of light sources (10) that emit white light and are disposed between the support structure (2) and the lower surface (7), the illumination device further comprising a plurality of NIR filters (18), each NIR filter associated with a light source (10) and configured to minimize a change in color temperature of the light spot while substantially preventing the transmission of wavelengths within a wavelength band of 680 nm to 900 nm, the NIR filters (18) being configured to substantially prevent the transmission of wavelengths within a wavelength band of 680 nm to 900 nm, the NIR filters (18) being configured to substantially prevent the transmission of wavelengths within a wavelength band of 680 nm to 900 nm while minimizing a change in color temperature of the light spot.

1. The surgical lighting device (1), wherein each of the plurality of NIR filters (18) is also movably disposed between an activated position, in which they are disposed in front of the light source (10) to filter the light emitted by the light source (10), and a non-activated position, in which they are unable to filter the light coming from the light source (10), and the lighting device further comprises a control unit (24) configured to control the movement of the plurality of NIR filters (18) between the activated and non-activated positions, and the lighting device further comprises means (26, 28) for receiving a signal from a fluorescence image capture device, and the control unit (24) is configured to control the movement of the NIR filters (18) between the activated and non-activated positions according to a signal indicating that the fluorescence image capture device has been activated.

2. 2. The surgical lighting device of claim 1, further comprising a plurality of optical elements (14) configured to collect, focus and / or concentrate light from the light source (10), and wherein the plurality of NIR filters (18) are disposed at at least one of the following positions: between the light source and the optical elements (14), on a surface of the optical elements (14) facing the light source (10), on a surface of the optical elements facing away from the light source (10), between the optical elements and the lower surface (7), and on a surface of the lower surface (7).

3. The surgical lighting device according to claim 1 or 2, wherein the NIR filter (18) is included in the lower surface (7).

4. The surgical lighting device of claim 2 , wherein the NIR filter (18) is included in the optical element (14).

5. 2. The surgical lighting device of claim 1, wherein the control unit is configured to communicate with a control panel, the control unit being configured to control the movement of the NIR filter between the activated and non-activated positions according to signals from the control panel.

6. The surgical lighting device of claim 5, wherein the control panel (5) is attached to the lighting device.

7. The surgical lighting device of claim 5, wherein the control unit is configured to communicate wirelessly with the control panel (5).

8. The surgical lighting device of any of claims 1 to 7, wherein a plurality of NIR filters (18) are disposed on a rotating disc (16), the rotation of which is controlled by the control unit (24).

9. 9. The surgical lighting device of claim 1, wherein a plurality of NIR filters (18) are arranged on a rotating disk (16) in an alternating pattern with a plurality of open spaces or a plurality of optical elements other than the NIR filters, and rotation of the rotating disk changes the illumination device between an activated configuration, in which the plurality of NIR filters are positioned in front of each light source (10) to filter light emitted by the light sources (10) during a fluorescence imaging procedure, and a non-activated configuration, in which light from the light sources (10) does not pass through the NIR filters.

10. The surgical lighting device of claim 9, wherein the rotating disk is automatically rotated to place the lighting device in the activated configuration based on a signal indicating that the fluorescent image capture device is activated.

11. The surgical lighting device of any of the preceding claims, wherein the light source (10) comprises at least one LED.

12. 12. The surgical lighting device of claim 1, wherein each NIR filter has a maximum transmission of 0.5% or less in the band of wavelengths that are substantially blocked, and a transmission of 85% or more from 400 nm to the substantially blocked wavelength.

13. 13. The surgical lighting device of claim 1, further comprising a plurality of NIR filters (18) in front of each of the light sources (10), the lighting device providing a central illumination (Ec) of at least 40,000 lux at the center of the light spot 1 meter from the exit side of the surgical lighting and a transmittance of 0.5% or less in a wavelength band of at least 50 nm between wavelengths of 680 nm and 900 nm.

14. The lighting device has a maximum central illumination (Ec) of 160K lux and has a maximum illumination of 1000 mW / m ２ 14. The surgical lighting device of claim 1, having an irradiance in the wavelength band of 700 nm to 750 nm of

15. The lighting device has a maximum central illumination (Ec) of 160K lux and has a maximum illumination of 100 mW / m ２ 15. The surgical lighting device of claim 1, having an irradiance in the wavelength band of 750 nm to 850 nm of

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