Surgical lighting device

Abstract

This disclosure relates to a surgical illumination device for generating a spot of light at a surgical site, used in conjunction with a fluorescence imaging device. The illumination device (1) includes: a support structure (2); a bottom surface (7) connectable to the support structure (2) to seal 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 bottom surface (7). The device also includes a plurality of NIR (near-infrared) filters (18), each NIR filter associated with a light source (10) and configured to substantially block transmission of wavelengths in the 680 nm to 900 nm band while minimizing variations in the color temperature of the spot of light.

Description

Technical Field

[0001] This disclosure relates to a surgical illumination device for use with a fluorescence medical imaging system. Background Technology

[0002] Fluorescence medical imaging is a technique used during surgery to help surgeons locate target organs or tissues in a patient. This technique consists of illuminating a region of interest with an excitation wavelength designed to cause specific molecules to fluoresce. Typically, the light emitted by the molecules has a wavelength slightly longer than the excitation light. These molecules can be injected into the patient beforehand as fluorescent markers. Endogenous molecules (i.e., molecules naturally present in the organism) can also fluoresce based on the metabolic state of the tissue, provided the excitation light has an appropriate wavelength. This latest technique is called autofluorescence.

[0003] Today, fluorescence medical imaging has become commonplace, and a variety of devices are available on the market. Typically, these devices operate in the near-infrared wavelength range, meaning both the excitation and detection light are in the 700 nm to 900 nm wavelength range. The intensity of fluorescence is relatively weak. Therefore, minimizing stray light in the detected wavelength is crucial.

[0004] Operating rooms are typically equipped with surgical lighting equipment that conforms to recognized standards that define the characteristics of the emitted light. For example, the NF EN 60601-2-41 standard explicitly requires surgical lights to emit white light with a color temperature (Tk) between 3000K and 6700K and a general color rendering index (CRI) (or Ra) greater than or equal to 85. Additionally, a suitable R9 should be available. The color temperature and CRI of the emitted light are crucial for allowing surgeons to correctly see colors and shades while minimizing eye strain. Partly due to these limitations, most light sources used for surgical illumination emit light that falls partially within the wavelength range detected by fluorescence medical imaging devices. Therefore, surgical lights are typically switched off when using fluorescence medical imaging devices to avoid interfering with the detection of fluorescence signals or manipulating the lights so that they do not further illuminate the region of interest.

[0005] FR 2989876 describes a fluorescence medical imaging system for an operating room, wherein both the surgical lamp and the imaging detector are equipped with filters, allowing the surgical lamp to remain on and pointed towards the region of interest during fluorescence imaging operations without interfering with fluorescence detection. The filters for the surgical illumination equipment are attached to the outside of the luminaire and cover its entire surface, approximately 0.5 μm. 2The authors recognized that manufacturing a filter of this size with the required accuracy would be extremely expensive. Therefore, the filter could not exclude all light within the fluorescence imaging field. Consequently, this filter must be paired with an additional filter on the fluorescence imaging detector to avoid interference. Thus, such an arrangement is only possible with a suitable detector. Furthermore, detector filters inevitably attenuate the detectable signal. Moreover, attaching such a filter to an operating light becomes complicated because the operating light must have a surface that can be cleaned efficiently and easily. Summary of the Invention

[0006] The purpose of this disclosure is to mitigate the problems associated with the prior art, and more specifically, to provide a surgical illumination device operable to provide visible white light without disturbing the detected fluorescence signal when using a fluorescence medical imaging apparatus. This disclosure also aims to provide a surgical illumination device operable during fluorescence medical imaging regardless of the use of an imaging apparatus.

[0007] This and other objectives are achieved in a surgical illumination device used in conjunction with a fluorescence imaging apparatus for generating a spot of light at a surgical site, wherein the illumination device includes: a support structure; a bottom surface that can be coupled to the support structure to seal the lower surface of the device while allowing light to pass through; and a plurality of light sources positioned between the support structure and the bottom surface capable of emitting white light. The device also includes a plurality of NIR filters, each associated with a light source and configured to substantially block transmission of wavelengths in the approximately 680 nm to 900 nm band while minimizing variations in the color temperature of the spot of light. Each of the NIR filters is also arranged to move between an active position and a non-active position, in which each NIR filter is positioned in front of the light source to filter light emitted by the light source, and in the non-active position, each NIR filter is unable to filter light from the light source. The apparatus further includes a control unit configured to control the movement of the plurality of NIR filters between an active position and an inactive position, and a component for receiving signals from a fluorescence imaging device, the control unit being configured to control the movement of the NIR filters between the active and inactive positions based on a signal indicating that the fluorescence imaging device has been activated or based on a signal received from the fluorescence imaging device.

[0008] Installing multiple NIR filters (i.e., filters that suppress the transmission of wavelengths in the near-infrared range), each associated with a light source, allows the filter size to be kept small and thus improves the accuracy of the filters in effectively blocking any stray light in the near-infrared range at a reasonable cost. Therefore, the device can be used with commercially available fluorescence imaging devices without additional modifications. Enclosing the filters within a sealed illumination unit further facilitates cleaning of the device. Since any filtering of light will cause some change in the color temperature of the light spot, controlling the deployment of the filters in this way allows surgeons to select the optimal light according to their needs. Furthermore, automatically controlling the position of the filters using signals indicating the status of the fluorescence imaging device, regardless of whether it is based on the operating characteristics of fluorescence imaging, is very helpful in activating the filters while ensuring optimal illumination.

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

[0010] In an advantageous embodiment, the NIR filter is included in the bottom surface or in the optical element. This can be achieved by applying one or more thin layers to the underlying element, by surface treating the underlying element, or by bonding a separate optical component having the desired absorption properties in the near-infrared wavelength range to the underlying element.

[0011] According to an advantageous embodiment, the control unit is configured to communicate with a control panel; the control unit is configured to control the movement of the NIR filter between an active position and a non-active position based on signals from the control panel. The control panel can be mounted on the lighting device, for example, fixed to the outside of a support structure, i.e., fixed to the housing of the device. Alternatively, the control unit can be configured to communicate wirelessly with the control panel to allow remote control of the filter position.

[0012] In a particularly advantageous arrangement, multiple NIR filters are positioned on a rotating disk, the rotation of which is controlled by the control unit. For example, the multiple NIR filters can be positioned on the rotating disk such that other optical elements or empty spaces are alternated with the NIR filters. In some cases, the active position corresponds to the NIR filters on the rotating disk being aligned with multiple light sources, and the inactive position corresponds to other optical elements or empty spaces on the optical disk being aligned with light sources. In this way, several filters can be activated or deactivated in a single movement.

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

[0014] In a preferred embodiment, each NIR filter has a transmittance of at most ≤0.5%, preferably 0.1%, and more preferably 0.01% in the substantially blocking band, and has a transmittance of ≥85% from 400 nm to the substantially blocking wavelength.

[0015] In a particularly advantageous embodiment, when the NIR filter is in front of the corresponding light source, the illumination device provides a central illumination (Ec) of at least 40,000 lux at the center of the light spot one meter away from the surface from which the surgical lamp outputs, while also providing a transmittance of at least 0.5%, preferably at most 0.1%, and more preferably at most 0.01% in a wavelength band of at least 50 nm between 680 nm and 900 nm.

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

[0017] In a specific implementation, a lighting device with a maximum center illumination (Ec) of 160 Klux has a maximum of 1000 mW / m in the 700 nm to 750 nm wavelength band. 2 Irradiance.

[0018] In a specific implementation, a lighting device with a maximum center illumination (Ec) of 160 Klux has a maximum of 100 mW / m² in the 750 nm to 850 nm wavelength band. 2 And preferably a maximum of 50mW / m 2 Irradiance.

[0019] According to another embodiment, a surgical illumination device for generating a light spot at a surgical site, used in conjunction with a fluorescence imaging device, is proposed. The illumination device includes: a support structure; a bottom surface that can be coupled to the support structure to seal the lower surface of the device while allowing light to pass through; and a plurality of light sources emitting white light and positioned between the support structure and the bottom surface. The device further includes a plurality of NIR filters, each associated with a light source and configured to substantially block wavelength transmission in the 680 nm to 900 nm band, while minimizing color temperature variations of the light spot, such that the illumination device, with a center illumination maximum (Ec) of 160 Klux, has a maximum of 1000 mW / m² in the 700 nm to 750 nm band. 2 Irradiance.

[0020] It should be understood that the different implementation schemes described above can be combined with each other. Attached Figure Description

[0021] This disclosure will be better understood after reading the detailed description of the embodiments illustrated by non-limiting examples and by means of the accompanying drawings, and other advantages of this disclosure will become apparent, as shown in the drawings:

[0022] Figure 1 A lighting device according to this disclosure is shown;

[0023] Figure 2 This is a graph showing the emission spectrum of a white LED;

[0024] Figure 3 schematically shown Figure 1 Possible locations of filters in surgical lighting devices;

[0025] Figure 4 Showing through Figure 1 A partial sectional view of the lighting device in plane AA;

[0026] Figure 5 A filter disk according to an embodiment is schematically shown;

[0027] Figure 6 This is a functional diagram showing the control of the lighting device;

[0028] Figure 7 The schematic illustration shows the implementation scheme according to the preferred scheme. Figure 1 and Figure 2 The transmission curve of the NIR filter in the lighting device; and

[0029] Figure 8 The power supply illumination of a surgical lighting device with an NIR filter and a surgical lighting device without a filter are schematically shown. Detailed Implementation

[0030] In the accompanying drawings, the same reference numerals are used for the same elements.

[0031] Figure 1A surgical lighting device 1 according to this disclosure is shown. The lighting device 1 shown is a lamp head, which can be used together with other lamp heads or separately in a surgical lamp assembly. The surgical lighting device 1 has a housing or casing 2, which forms the rear of the lamp head. The casing, alone or together with other structural elements, serves as a support structure 2 for various optical and electronic components of the lighting device. The casing 2 can be coupled to a hinged arm 8, thereby allowing suspension from the ceiling of the operating room. The casing 2 can also be coupled to a movable or fixed support. The casing 2 is substantially dome-shaped, having an invisible rear surface and an edge 3 extending perpendicularly to this rear surface, and houses various optical and electrical components for generating light. A laterally extending handle 4 for manipulating and positioning the lighting device 1 is connected to the edge. A control panel 5, in the form of a keyboard, touch screen, etc., is mounted on the handle 4 to control various functions of the lighting device, as described later. It should be noted that the handle 5 can be in different forms or omitted entirely. Furthermore, the control panel 5 (if present) can be located on the casing or on a separate controller. The lighting device 1 also includes a cover or bottom surface 7, which is at least partially transparent to allow light to pass through, and fits onto the lower surface of the housing 2 in a form that is in watertight contact with the edge 3 and forms the luminous surface of the lighting device. A sterile tubular handle 6 may also be provided on the lower surface of the lighting device, substantially in the center of this luminous surface or on the side to allow the device to be operated with one hand.

[0032] Although the housing 2 and bottom surface 7 shown in the figure have a substantially circular cross-section, it should be understood that this is merely illustrative. The lighting device 1 can be adapted to lamps of various shapes and structures, including cross-shaped or other forked shapes.

[0033] Fluorescence imaging is used during surgery to help surgeons identify specific structures or tissues. Fluorescence imaging devices can be handheld or attached to a shelf in the operating room. These devices work by emitting light to induce fluorescence in molecules within the body. Typically, molecules are traced by first injecting a tracer into the patient, but some natural or endogenous molecules can fluoresce under appropriate excitation light. The wavelengths of light emitted and detected by fluorescence imaging devices are typically in the near-infrared range, with excitation light usually emitted at wavelengths between approximately 700 nm and 800 nm, and fluorescence detected at wavelengths approximately 20 nm to 80 nm higher.

[0034] According to applicable standards, the light source used in surgical lighting devices should preferably be able to produce white light. For example, the NFEN 60601-2-41 standard requires surgical lamps to emit white light with a color temperature (Tk) between 3000K and 6700K and a general color rendering index (CRI) greater than or equal to 85. Halogen light sources have been used in surgical lamps, but today LEDs are more commonly used due to their high efficiency and low heat dissipation. Figure 2 A typical emission spectrum of a white LED suitable for use in surgical lighting is shown, illustrating the variation of the relative intensity I emitted by the LED with wavelength λ. This emission spectrum clearly shows that the emitted light extends into the near-infrared region and specifically coincides with the operating wavelength range of a fluorescence imaging device. The fluorescence intensity is relatively weak. Therefore, this light, when used in conjunction with the light from a fluorescence imaging device, is sufficient to severely interfere with fluorescence detection. It should be noted that the focusing optics and / or concentrating optics, as well as the bottom surface, are substantially transparent to radiation in the wavelength range from visible to near-infrared, such that the spectrum of a light spot located 1 meter from the illumination setup will be similar to the LED spectrum, but with reduced intensity. However, the intensity in the near-infrared wavelengths still extends far enough to interfere with fluorescence detection.

[0035] To avoid this disturbance during the operation of a fluorescence medical imaging device while allowing the use of a surgical illumination device, it is proposed to use filters to filter the light emitted by each light source. These filters are 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. Specifically, the filters ensure that the spectral irradiance in the near-infrared range (and more specifically, at the wavelengths used by the fluorescence medical imaging device) is less than approximately 0.1 W / m² / nm in the field illuminated by the surgical illumination device. In this disclosure, these filters will be referred to as NIR filters.

[0036] Figure 3 A schematic illustration shows a portion of a surgical illumination device with an NIR filter. Figure 3 The diagram shows a light source 10, an optical element 14, and a bottom surface 7. The optical element 14 is positioned and configured to focus and concentrate the light emitted by the light source 10. NIR filters can be placed in different locations within this device. In the diagram, these locations are indicated by Roman numerals I to V. More precisely, the NIR filter can be placed between the light source 10 and the optical element 14, indicated by location I. The NIR filter can be located on the input surface II or 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 placed between the optical element 14 and the bottom surface 7 at location IV. Finally, the NIR filter can be formed on the surface of the bottom surface, for example, by surface treatment of the bottom surface, as shown at location V. Placing NIR filter components within a surgical illumination device and adapting them to filter light from a single light source allows each filter to be very small. This enables the use of more precise manufacturing methods, which in turn allows for the production of more precise filters at a significantly reduced cost.

[0037] Figure 4 Showing through Figure 1A partial sectional view of the interior of the lighting device 1 in plane AA. Figure 4 Two light sources 10 are shown, which are mounted within a housing 2 via connectors 12, which are then secured to the housing 2. Connectors 12 may be part of one or more larger structural elements adapted to hold various optical and / or electronic components in place. Alternatively, the light sources and associated optics and circuitry may be mounted directly onto the housing. To cover all possible configurations, the housing and any structural components considered part of the support structure in this disclosure are collectively referred to as support structure 2. The light sources 10 may be of any type, but are preferably LED light sources. Above each light source is an optical element 14 in the form of a collimator, known to guide the luminous flux of the light source toward the illumination field. The optical elements 14 are also anchored to the housing directly or via connectors in a suitable manner. Other structures (e.g., heat sinks or light source control circuitry) may also be present, but are not shown herein. An insertable filter element, in the form of a disk 16, is placed between the optical element 14 and the bottom surface 7, and is rotatably mounted on the shaft 20 of a motor 22. The filter disk 16 may be made of a substantially transparent material, and the filter element 18 is positioned to match the position of the light source 10. The control unit 24 controls the motor 22 to rotate, and thus positions the filter element 18 in an active position above the light source 10, or moves the filter element 18 away from the light source 10 to a non-active position.

[0038] In addition to the NIR filter element (not shown), the filter disk 16 may optionally include an open space or alternative optical element aligned with the light source 10 in a non-operating position. The open space or alternative optical element may be alternately placed on the filter disk 16 with the NIR filter element 18. In such a placement, the disk 16 may be partially or substantially opaque in a region outside the light transmission region.

[0039] It should be understood that one or more filter disks 16 can be placed between the light source 10 and the optical element 14, that is, in Figure 3 Position I in the diagram. Although the NIR filter 18 ensures that the produced light spot meets the standards suitable for surgical lights, the NIR filter 18 may modify the color temperature of the light. Surgeons can selectively enable or disable the filter element 18, and thus select the lighting best suited to their needs.

[0040] Figure 5A plan view of a filter disk 16 with four filter elements 18 is shown, each positioned to filter light from one of four light sources 10 that can be perceived by the filter elements 18. The filter disk 16 has a substantially circular shape, but other shapes are also possible. Furthermore, it will be understood that, depending on the specific structure of the lighting device, the filter disk may include more or fewer filter elements 18 and thus be arranged above more or fewer light sources 10. Several filter disks 16 may be arranged within the same lighting device 1 to allow filtering of several light sources. For example, in... Figure 1 The lamp head shown has a total of 16 light sources, in which four filter disks 16 can be positioned and jointly controlled.

[0041] Figure 6 This is a block diagram illustrating the control of NIR filter 18. Control unit 24 is connected to motor 22, which drives shaft 20 to rotate filter disk 16 between an active and inactive position. Control unit 24 is connected to control panel 5. Figure 1 The control unit 24 receives manual commands via control panel 5, but can also send information for display. Control panel 5 can also be configured for contactless operation, for example, via voice commands. Control unit 24 can control other functions of the lighting equipment, including switching it on and off. Alternatively, the functions of the lighting device can be controlled by a remote control device that is wirelessly connected to the lighting device 1. Control unit 24 is further connected to control module input / output (I / O) 26 capable of receiving signals from external devices. These signals can be received via wired or wireless connections (e.g., via antenna 28, an infrared interface, or another suitable interface). Thus, the fluorescence medical imaging device can be coupled to the lighting device 1 to allow automatic deployment of filter elements 18 via control unit 24 when the imaging device is activated. To ensure the absence of stray light in the surgical area when using the fluorescence medical imaging device, the lighting device can also generate signals via control unit 24 or via a remote control device for controlling all other light sources in the operating room. Such a signal can also be generated in response to a signal from a fluorescence imaging device, causing the activation of the imaging device to automatically trigger the deployment of the filter in the effective position of the device and surgical lamp 1, and simultaneously turn off all other lights in the operating room.

[0042] Figure 7Transmission curves of an example NIR filter fitted to the surgical lighting apparatus of this disclosure are shown. The filter is characterized by a transmittance ≥85% at wavelengths from 400 nm to 710 nm, a transmittance of 50% at 730 nm, and a transmittance ≤0.01% at wavelengths from 740 nm to 900 nm, when the incident angle is 30°. Experiments with this filter in different surgical lamp configurations have yielded light spots with a correlated color temperature of approximately 5100 K and a color rendering index of 93 to 95. More generally, the NIR filter preferably blocks light with a wavelength equal to or greater than the blocking wavelength, preferably in the range of 680 nm to 740 nm. Preferably, light blocking is understood to mean a transmittance ≤0.5%, more preferably ≤0.1%, and even more preferably ≤0.01%. Furthermore, the filter can block light having a wavelength range extending from the blocking wavelength by at least 50 nm, preferably at least 100 nm, and more preferably at least 200 nm. The filter also has a visible light transmittance of ≥85% (i.e., wavelengths in the range from 400 nm to the blocking wavelength). In a preferred embodiment, the maximum central illumination (Ec) at the center of the light spot one meter from the emitting surface of the surgical lamp is at least 40,000 lux or at least 60,000 lux, while providing ≤0.5%, ≤0.1%, or ≤0.01% transmittance above the blocking wavelengths described above.

[0043] Figure 8 The graphs present the spectral irradiance of an illumination device equipped with an improved NIR filter (curve A) and an illumination device without a filter (curve B). In both cases, the spectral irradiance of the illumination device was measured using a JETI Specbos 1211 spectrometer (calibrated and COFRAC certified), which was configured to measure the spectral irradiance at the center of a light spot at a distance of 1 m from the device for the wavelength of interest. The value was normalized to the maximum center illumination of 160 Klux for the device. It can be seen that the device without a filter exhibits extremely high irradiance at wavelengths greater than 720 nm, with a spectral irradiance of approximately 60 mW / m at 800 nm. 2 On the other hand, devices with NIR filters achieve almost complete suppression of luminescence at wavelengths greater than or equal to 720 nm and have a spectral irradiance of approximately 120 mW / m² at 700 nm. 2 .

[0044] However, when considering the effect of irradiance on fluorescence detection, referencing the total irradiance emitted in the band of interest is more useful than referencing the spectral irradiance (i.e., the irradiance at a single wavelength). The table below shows the sum of spectral irradiance values ​​measured for different bands.

[0045]

[0046] More generally, preferably, a lighting device with a maximum center illumination (Ec) of 160 Klux has a maximum of 1000 mW / m in the wavelength range of 700 nm to 750 nm. 2 Irradiance and preferably a maximum of 800 mW / m 2 Preferably, the lighting device has a maximum irradiance of 100 mW / m² in the 710 nm to 750 nm wavelength band and a maximum irradiance of 100 mW / m² in the 750 nm to 850 nm wavelength band. 2 The irradiance, and more preferably a maximum of 50 mW / m 2 .

[0047] The filter element 18 can be any suitable material (including, but not limited to, plastics, silicone, and glass, or combinations thereof), and can be dichroic or absorptive. The filter element can be manufactured by surface treatment of the material (including, but not limited to, sol-gel processes, applying absorbent powder during material injection, and depositing a thin layer under vacuum). The filter element 18 can also be formed as a separate optical element in the form of a plate or disk, which is glued or otherwise fixed to the bottom surface 7 or the optical element 14.

[0048] The specific characteristics described above are merely variations of the non-limiting properties. Those skilled in the art will understand that the characteristics described herein have been conceived and disclosed in various possible combinations and sub-combinations.

[0049] Reference number list

[0050] 1. Surgical lighting device

[0051] 2. Shell / Support Structure

[0052] 3. Edge

[0053] 4. Handle

[0054] 5. Control Panel

[0055] 6. Sterile stem

[0056] 7. Lid / Bottom Surface

[0057] 8. Articulated Arm

[0058] 10 Light Source

[0059] 12 Connectors

[0060] 14 Optical Components

[0061] 16 Filter Disks

[0062] 18 Filters

[0063] 20-axis

[0064] 22 motors

[0065] 24 Control Unit

[0066] 26 I / O modules

[0067] 28 antennas

Claims

1. A surgical illumination device (1) for generating a light spot at a surgical site in conjunction with a fluorescence imaging device, the surgical illumination device (1) comprising: Support structure (2); The surgical illumination device includes a bottom surface (7) capable of being coupled to the support structure (2) to seal the lower surface of the surgical illumination device while allowing light to pass through; and a plurality of light sources (10) emitting white light and arranged between the support structure (2) and the bottom surface (7). The surgical illumination device also includes a plurality of NIR filters (18), each associated with a light source (10) and configured to substantially block transmission in the range of 680 nm to 900 nm. The wavelengths within the nm band are minimized, while minimizing the color temperature variation of the light spot. Each of the NIR filters (18) is also positioned in a movable manner between an active position and a non-active position, in which the NIR filter (18) is located in front of the light source (10) to filter the light emitted by the light source (10), and in the non-active position, the light from the light source (10) cannot be filtered. The surgical illumination device also includes a control unit (24) configured to control the movement of the plurality of NIR filters (18) between the active and non-active positions. The surgical illumination device also includes components (26; 28) for receiving signals from a fluorescence imaging device. The control unit (24) is configured to control the movement of the NIR filters (18) between the active and non-active positions according to a signal indicating that the fluorescence imaging device has been activated.

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

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

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

5. The surgical lighting device according to claim 1, wherein the control unit (24) is configured to communicate with the control panel (5), and the control unit (24) is configured to control the movement of the NIR filter (18) between the active position and the inactive position based on a signal from the control panel.

6. The surgical lighting device according to claim 5, wherein the control panel (5) is mounted on the surgical lighting device.

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

8. The surgical lighting device according to claim 1 or 2, wherein a plurality of NIR filters (18) are placed on a rotating disk (16), and wherein the rotation of the rotating disk (16) is controlled by the control unit (24).

9. The surgical illumination apparatus according to claim 1 or 2, wherein a plurality of NIR filters (18) are arranged on a rotating disk (16) in an alternating pattern with a plurality of optical elements or a plurality of open spaces other than the NIR filters; wherein the rotation of the rotating disk causes the surgical illumination apparatus to change between an active configuration and a non-active configuration, in which the plurality of NIR filters are positioned in front of a respective light source (10) to filter the light emitted by the light source (10) during a fluorescence imaging process, and in the non-active configuration, light from the light source (10) does not pass through the NIR filters.

10. The surgical illumination apparatus of claim 9, wherein the rotary disk rotates automatically to place the surgical illumination apparatus in the operational configuration based on a signal indicating that the fluorescence imaging apparatus has been activated.

11. The surgical lighting device according to claim 1 or 2, wherein the light source (10) comprises at least one LED.

12. The surgical illumination apparatus according to claim 1 or 2, wherein each NIR filter has a maximum transmittance of ≤0.5% in the band of substantially blocking wavelengths and a transmittance of ≥85% from 400 nm to substantially blocking wavelengths.

13. The surgical illumination apparatus according to claim 1 or 2, wherein each NIR filter has a maximum transmittance of ≤0.1% in the band of substantially blocking wavelengths and a transmittance of ≥85% from 400 nm to substantially blocking wavelengths.

14. The surgical illumination apparatus according to claim 1 or 2, wherein each NIR filter has a maximum transmittance of ≤0.01% in the band of substantially blocking wavelengths and a transmittance of ≥85% from 400 nm to substantially blocking wavelengths.

15. The surgical illumination apparatus according to claim 9, wherein, with the plurality of NIR filters (18) in front of the respective light source (10), the surgical illumination apparatus provides a center illumination (Ec) of at least 40,000 lux at the center of the light spot one meter from the emitting side of the surgical illumination, while also providing a maximum transmittance of ≤0.5% in a wavelength band of at least 50 nm between wavelengths of 680 nm and 900 nm.

16. The surgical illumination apparatus according to claim 9, wherein, with the plurality of NIR filters (18) in front of the respective light source (10), the surgical illumination apparatus provides a center illumination (Ec) of at least 40,000 lux at the center of the light spot one meter from the emitting side of the surgical illumination, while also providing a maximum transmittance of ≤0.1% in a wavelength band of at least 50 nm between wavelengths of 680 nm and 900 nm.

17. The surgical illumination apparatus according to claim 9, wherein, with the plurality of NIR filters (18) in front of the respective light source (10), the surgical illumination apparatus provides a center illumination (Ec) of at least 40,000 lux at the center of the light spot one meter from the emitting side of the surgical illumination, while also providing a maximum transmittance of ≤0.01% in a wavelength band of at least 50 nm between wavelengths of 680 nm and 900 nm.

18. The surgical lighting device according to claim 1 or 2, wherein the surgical lighting device with a maximum center illumination (Ec) of 160 Klux has a maximum irradiance of 1000 mW / m2 in the waveband of 700 nm to 750 nm. 2 of 1000 mW / m2 in the waveband of 700 nm to 750 nm.

19. The surgical illumination device according to claim 1 or 2, wherein the surgical illumination device with a maximum center illumination (Ec) of 160 Klux has a maximum of 100 mW / m² in the 750 nm to 850 nm wavelength band. 2 Irradiance.

20. The surgical illumination device according to claim 1 or 2, wherein the surgical illumination device with a maximum center illumination (Ec) of 160 Klux has a maximum of 50 mW / m² in the 750 nm to 850 nm wavelength band. 2 Irradiance.

Images