Endoscope measuring device for readjusting maximum luminosity

Abstract

The present application discloses an endoscope device, comprising a measuring device mountable on an endoscope head of the endoscope device for determining a characteristic parameter of an endoscope illumination of the endoscope device, wherein the endoscope illumination comprises at least one optical element through which light passes, wherein the measuring device comprises a light detection unit adapted to determine the characteristic parameter, wherein the endoscope head comprises a light exit area through which the endoscope illumination outputs a light quantity of light emitted from a light source, a luminosity of the light emitted from the light source is up to a preset maximum luminosity, and the characteristic parameter is based on the light quantity incident on the light detection unit; and a processing unit adapted to readjust the preset maximum luminosity based on the determined characteristic parameter.

Description

Technical Field

[0001] This disclosure relates to an endoscope device with a measuring mechanism in which maximum light intensity can be readjusted. Background Technology

[0002] For example, due to degradation effects, the light output power or luminous intensity of light emitted from the distal end of an endoscope or endoscope device may decrease over time. Examples of degradation effects include fiber breakage within a single fiber and increased fiber optic connector loss when light couples into the fiber in the case of an endoscope device with optical fibers. Other examples of degradation effects on endoscope lenses include haze or contamination of existing extension optics (e.g., extension lenses) or existing light exit windows. Light exit windows may be provided, for example, in a cap that can be inserted into the endoscope lens to cover the light exit opening (of light emitted via, for example, extension optics), or the light exit window or light exit area and / or (e.g., a camera integrated into the endoscope lens) the light entrance opening, or the light entrance window or light entrance area.

[0003] Therefore, the light output power required for using the endoscope lens at the distal end of the endoscope device, such as in a subject's body cavity, may not always be available. Replacing degraded components is typically time-consuming, material-intensive, and costly.

[0004] Therefore, the purpose of this disclosure is to provide an endoscope device that can eliminate this drawback. Summary of the Invention

[0005] This disclosure solves the above-mentioned problems by means of an endoscopic device having the measuring apparatus according to claim 1. Embodiments thereof are described in detail in the dependent claims.

[0006] Specifically, an endoscope device with a measuring apparatus is disclosed, which can be mounted on an endoscope lens for determining characteristic parameters (e.g., characteristic values, characteristic quantities, or attributes) of the endoscope illumination (e.g., illumination components or illumination units) of the endoscope device. The endoscope device has a light detection unit and a processing unit. The endoscope illumination has at least one optical element through which light passes.

[0007] The installation of the measuring device can be achieved in various ways, such as (but not limited to) by placing it on or inserting it into the measuring device, by means of an external holding device such as a clamp or bracket, by means of a plug-and-play lock such as a bayonet lock, and / or by means of a magnetic holding device.

[0008] To communicate with the endoscope, the measuring device can be connected wirelessly or directly or indirectly via a communication interface, either through a wire / cable. The processing unit can be located in the endoscope, the measuring device, or an external device that is wirelessly or via a wire / cable connected to at least the endoscope, the measuring device, or the communication interface.

[0009] A light detection unit is adapted or configured to determine characteristic parameters, wherein the endoscope has or includes a light emission region or a light output region (e.g., a light emission surface or light emission plane), through which the endoscope illumination outputs the amount of light emitted from a light source, the light emitted from the light source having a luminous intensity or light output power up to a preset maximum luminous intensity. In other words, the light emitted by the endoscope illumination can be understood as output light. Due to losses, the luminous intensity of this output light is typically less than the preset maximum luminous intensity of the light source. This means that the output light can be understood as a portion, a small portion, or a fraction of the light emitted by the light source, i.e., the amount of light (e.g., a portion of light or a small portion of light). This relationship applies to changes in the luminous intensity of the output light that can be caused by changes in the luminous intensity of the light source. For example, if the luminous intensity of the light source increases / decreases, the luminous intensity, i.e., the amount of light, of the output light increases / decreases.

[0010] The light leaving the endoscope, that is, the light that has passed through the light exit area of ​​the endoscope, is called the light quantity. The light exit area is formed by optical elements through which the light quantity leaves the endoscope. For example, the light exit area can be formed by an expanding (or extender) optics (such as an expanding lens), a light exit window (light output window) located in the cap or cover of the endoscope, a light guide that directs light from a light source to the endoscope, or a light-emitting element such as an LED arranged in the endoscope.

[0011] The characteristic parameters are based on the amount of light incident on the light detection unit. The processing unit is adapted to readjust the preset maximum luminous intensity based on the determined characteristic parameters.

[0012] By means of the endoscope apparatus with measuring devices according to this disclosure, the maximum luminous intensity or maximum light output power of the light source associated with the endoscope can be readjusted such that the associated luminous intensity of the light emitted at the distal end of the endoscope apparatus is not lower than a predetermined minimum luminous intensity or minimum light output power. Therefore, for example, replacement of degraded components in the endoscope apparatus can be avoided. Such deterioration may include, for example, reduced luminous intensity of the light source, increased loss when coupling light to the light guide element, damage or blurring of the light guide element, scratches or blurring of the extended optics, or scratches or blurring of the light exit window of the cap. Therefore, this disclosure allows for savings in time, materials, and costs.

[0013] In addition, the light source can be integrated into the endoscope device. Alternatively, the light source can be adapted to be connected to the endoscope device.

[0014] Therefore, the measuring device according to this disclosure is not limited to a specific type of light source, but can be applied to different types of light sources. Thus, it is conceivable, for example, that the measuring device is used for a light source whose light is guided to the distal end of an endoscope via a light-guiding element (e.g., an optical fiber). The measuring device can also be used if the light source is formed or implemented as an internal light source within an endoscope (e.g., in the form of an LED).

[0015] The processing unit can also be adapted to readjust the preset maximum luminance so that the luminance of the light is equal to or less than the predefined luminance threshold.

[0016] One advantage of this approach is that insufficient light intensity exiting the endoscope, such as due to individual fiber breaks in the fiber bundle or scratches, contamination (e.g., stains or dirt), blurring, or shadows on the light exit window, can be compensated for by appropriate readjustment or adjustment of the light source. In these cases, replacement of the entire fiber bundle can be prevented. Generally, the measuring device according to this disclosure allows for compensation of losses in the optical guides of the endoscope system due to fiber breaks and / or fiber connector losses during fiber use.

[0017] Endoscopic illumination may have a light guide as at least one optical element, the light guide being adapted to guide light from a light source to the endoscope, where light is emitted from the light-emitting area at the endoscope.

[0018] For example, such a light guide can be represented or implemented by at least one optical fiber, at least one individual fiber bundle, or another light guide element or medium. Therefore, the measuring device according to this disclosure can be used in different types of endoscopic devices.

[0019] Additionally, endoscopic illumination may have or include expanding (or extender) optics (e.g., an extending lens) and / or a light exit window as additional optical elements, wherein the light exit area is formed by the expanding optics, or the light exit area is formed by the light exit window if (i.e., if or assuming) the endoscopic illumination includes a light exit window as another optical element. The light exit window may be formed in a cap or cover covering the distal end of the endoscope lens.

[0020] Additionally, the measuring device can be adapted such that the amount of light emitted by at least one optical element (e.g., a light guide) and incident on the light detection unit illuminates a cross section of the light detection unit, wherein the area of ​​the cross section is greater than or equal to the cross-sectional area of ​​the at least one optical element. The light detection unit can also be adapted to measure the emitting area (i.e., the area emitting light) of the at least one optical element and determine the ratio of the emitting area of ​​the at least one optical element to the non-emitting area (i.e., the area not emitting light) of the at least one optical element (i.e., the light detection unit can measure the illuminated area of ​​the light guide and express it as a ratio to the non-illuminated area of ​​the light guide). This can be accomplished, for example, by the light detection unit knowing a predefined reference area (e.g., the size of the emitting area at the end of the light guide, if not degraded), on which the at least one optical element (e.g., the light guide) emits light.

[0021] It should also be noted that, for example, if a light exit window exists, the above measurement procedure can, in principle, also be applied to the light exit window. This means that the luminescent (illuminating) area of ​​the light exit window can be expressed as the ratio of its non-luminescent (non-illuminating) area to the total area of ​​the light exit window, or the ratio of the area of ​​the light exit window with lower luminescent intensity (lower illumination intensity) to the total area of ​​the light exit window. A lower luminescent area should be understood as an area from which light emitted is below, for example, a predetermined brightness threshold and / or below, for example, a certain percentage (10%, 20%, 30%, or any other percentage not listed here) the average brightness of light emitted from the total area of ​​the light exit window.

[0022] For example, if the photodetector unit consists of an arrangement of multiple pixels, the amount of light incident on the multiple pixels in this manner allows for the avoidance of light collimation or focusing, resulting in a light-emitting area greater than or equal to the light-receiving area. This reduces the risk of individual pixels being overexposed. In other words, it reduces the risk that one or more of the multiple pixels will convert the light incident on them into charge and reach saturation or a certain level before a predetermined time period has elapsed.

[0023] At least one optical element (e.g., a light guide) may have a first optical element (first light guide) and a second optical element (second light guide), and the cross section of the light detection unit irradiated by the incident light may have a first cross section and a second cross section. In this case, the measuring device can be adapted such that a first portion of the light emitted via the first optical element irradiates the first cross section of the light detection unit, and a second portion of the light emitted via the second optical element irradiates the second cross section of the light detection unit, wherein the first and second cross sections of the light detection unit do not overlap. In this case, it is advantageous if the light detection unit is implemented in the form of an imaging sensor system.

[0024] This configuration, in principle, provides the possibility of distinguishing between the first and second optical elements (the first and second light guides) based on information detected by the first and second cross-sections of the light detection unit. This means, in principle, that it provides the possibility, for example, based on the obtained information, to replace only one of the two light guides and / or individually readjust the maximum preset luminous intensity of each of the two light guides.

[0025] Furthermore, the processing unit can be adapted to distinguish the first optical element (e.g., the first light guide) and the second optical element (e.g., the second light guide) based on the difference in characteristic parameters obtained from the first cross section and the second cross section, and to readjust the preset maximum luminous intensity of the first optical element (e.g., the first light guide) and the second optical element (e.g., the second light guide) respectively.

[0026] Based on the aforementioned distinguishability of the first and second optical elements, this, among other things, produces the advantages already shown, allowing for the independent detection, evaluation, and implementation of, for example, readjustment of the preset maximum luminosity of the first and second optical elements. If the degradation states of the two optical elements differ, the risk of one optical element being overloaded (e.g., excessive strain or stress) or improperly loaded (e.g., incorrect strain or stress) can be reduced.

[0027] In particular, the measuring device may also include a telecentric lens (e.g., a telecentric objective lens) arranged such that light passes through the telecentric lens after passing through the light exiting region and is incident on a light detection unit arranged in the measuring device.

[0028] By using a telecentric lens, the beam path of light emitted from the endoscope lens of the endoscope device can be manipulated or altered. Therefore, vertical observation can be performed at / on the distal end of the endoscope device through the telecentric lens, for example, at / on the light-emitting end of at least one optical element (i.e., at least one optical fiber or at least one bundle of optical fibers).

[0029] The light detection unit can also be an imaging sensor system, which is further adapted to determine image data based on the amount of light incident on the imaging sensor system as a characteristic parameter. In other words, in this case, the imaging sensor system can be implemented as, for example, a camera integrated into a measuring device, or an image sensor that generates image data based on incident light and transmits it, for example, wirelessly or via wire / cable to an external device for further processing. The display unit can be used to display, for example, an image showing a planar view including a plane including the light emitting area (as image information obtained or derived from the image data). This means that if light guiding elements such as fiber bundles are used, the image can show the emitting distal ends of these fiber bundles. The image data can identify or represent, but is not limited to, (maximum, minimum) light intensity values ​​or light intensity distribution, (maximum, minimum) contrast values ​​or contrast distribution (e.g., the contrast between a cross section emitting light of different intensities and a cross section that does not emit light), and / or (maximum, minimum) luminance values ​​or luminance distribution.

[0030] This in principle provides the possibility of assessing the deterioration status of an endoscope based on at least one image of the distal end of the endoscope in a luminous and / or non-luminous state (provided that the measuring device provides a separate light source for illumination during image acquisition).

[0031] Regardless of the actual implementation of the measuring device, based on image data, image information (i.e., information obtained from images, such as images of the distal ends of the aforementioned fiber bundles and images of the luminescent regions determined therefrom, generated based on the obtained image data) may also include at least one image of the end of at least one optical element in a luminescent state. The processing unit may also be adapted to derive a small fraction of the luminescent area of ​​the end relative to the total area of ​​the end based on the image information, and / or, provided the endoscope device includes a light guide as at least one optical element and the light guide comprises multiple optical fibers, to derive the degree of degradation of the multiple optical fibers (e.g., a brightness loss of 5%, 10%, or 15% (or any other threshold not mentioned herein) compared to a reference brightness value due to haze / contamination at the end), and / or to derive the number of defective and / or defect-free optical fibers among the multiple optical fibers (the number of defective or broken optical fibers being greater than a preset threshold, such as 10%, 15%, or 20% (or any other threshold not mentioned herein)). Specifically, for example, the ratio between the luminescent area and the total area can be determined. For example, if the total area is determined by the distal ends of multiple optical fibers, a ratio of 1 indicates that all fibers emit light. Conversely, if the ratio is less than 1, there are fibers that do not emit light and are broken. The greater the deviation of the ratio from the ideal value of 1, the greater the number of fiber breaks that can be estimated. If a predefined threshold, such as 0.7, 0.6, or 0.5 (or any other threshold not mentioned herein), is reached, and if the preset maximum luminous intensity has been readjusted in such a way that further readjustment of the preset maximum luminous intensity cannot compensate for the condition or state of the fiber, or that further readjustment of the preset maximum luminous intensity is not permitted, the processing unit may issue or output a replacement (of the affected fiber bundle) as an alternative action or process.

[0032] Furthermore, the processing unit can be adapted to derive scratches and / or haze (e.g., turbidity) and / or contamination of the light exit window. This means that the processing unit can also be adapted to derive the degree of damage (deterioration) of the light exit window based on image information in the form of at least one of contamination (e.g., dirt or stains), scratches, or haze. In this case, the user can estimate the violation (exceedance) of a damage threshold (e.g., through visual inspection of the light exit window). Alternatively, an image of the light exit window (and / or, for example, the light entrance window or light inlet window of an endoscope's internal camera) in its current state can be compared with a reference image or multiple reference images representing, for example, different deterioration states of the light exit window, and the current deterioration state of the light exit window can be derived using, for example, image processing methods or the user's estimation ability.

[0033] Therefore, the measuring apparatus according to this disclosure enables the targeted study of individual potential degradation effects with multiple different potential degradation effects.

[0034] If the degree of degradation exceeds a preset degradation threshold (a preset threshold for the degree of degradation) and / or the number of defective optical fibers (if present) exceeds a preset number threshold (a preset threshold for the number of defective optical fibers), the processing unit may also be adapted to perform a preset maximum luminous intensity readjustment.

[0035] In this way, as exemplified in the case of fiber bundles using single optical fibers, the replacement of the entire fiber bundle made of single optical fibers can be avoided. Instead, for example, if a preset threshold for the degree of degradation and / or a preset threshold for the number of defective optical fibers is exceeded, processing or treatment of the fiber emitting end, such as cleaning or polishing, can be derived or inferred as an alternative action or process to reduce the determined degree of degradation. Alternatively or additionally, a preset maximum luminous intensity can be readjusted to compensate for the degradation conditions or state at the fiber emitting end and / or for individual defective or broken optical fibers. For example, if the fiber is degraded to such an extent (e.g., if a predetermined degree of damage is reached as described below) that processing / treatment and / or readjustment cannot / cannot compensate for the loss / luminous intensity loss caused by the degradation, replacement of the fiber may be necessary.

[0036] Alternatively or additionally, if the damage degree of the light exit window exceeds a preset damage degree threshold (preset damage degree threshold), the processing unit may also be adapted to prevent readjustment of the preset maximum luminance.

[0037] Based on the embodiments discussed above, the information provided by the measuring device offers the advantage of determining the degradation state of the endoscope device for different components and in different ways. Specifically, the collected information allows for image-based evaluation (the acquired image data used to generate an image for obtaining image information). Alternatively, the measuring device can be configured to reflect the amount of light emitted by the endoscope lens back to a camera integrated into the endoscope lens. In this case, the camera obtains image data via the endoscope lens and derives image information from the endoscope image generated by the endoscope device. Simultaneously, with appropriate aperture selection, the camera can also detect contamination (e.g., stains or dirt), scratches, and haze in the light-emitting area / affecting the light-emitting area (and / or, for example, the lens surface (extended optics / lens)). This requires a camera with sufficient depth of field to detect continuous fiber bundle layers (if present) and the lens surface.

[0038] The degradation or reduction in luminance over time can then be statistically detected, for example, based on the sum of all pixel intensities (i.e., individual pixel values) associated with various values ​​of brightness control (exposure time, gain). Furthermore, image dynamics (e.g., contrast) assessment based on the image allows for conclusions regarding contamination and / or haze of the camera window / affecting the camera window and / or the light exit window.

[0039] For various reasons, further readjustment of the preset maximum illumination may be prevented or interrupted. In short, the existing state / degree of degradation of the endoscopic apparatus and / or endoscopic illumination (e.g., at least one optical element) may have progressed to the point where (further) readjustment of the preset maximum illumination would not compensate for this advanced degradation or the resulting loss / luminosity.

[0040] Furthermore, the measuring device can be mounted on the endoscope lens of an endoscope device and also includes a Ulbricht sphere (integrating sphere) with a diffuse reflective inner surface, which is adapted to diffusely reflect light before it illuminates or reaches the light detection unit. In this case, the light detection unit is a photoelectric sensor.

[0041] The combination of the measuring device and the Ulbricht sphere provides a technically easy-to-implement option. Furthermore, it should be noted that the implementation combining the Ulbricht sphere can also be used as at least one optical element having, for example, a first and a second optical guide, in the case of an optical guide.

[0042] The measuring device can also be mounted on the endoscope lens of the endoscope device and include a diffuser adapted to opaquely diffuse the amount of light before it illuminates or reaches the light detection unit. In this case, the light detection unit is a photoelectric sensor.

[0043] The combination of the measuring device and the diffuser provides a technically easy-to-implement option. Furthermore, it should be noted that the implementation combining the diffuser can also be used with a light guide as at least one optical element, having, for example, a first light guide and a second light guide.

[0044] Additionally, the measuring device may include a dark-field light detection unit adapted to determine dark-field characteristic parameters (e.g., dark-field characteristic values, dark-field characteristic quantities, or characteristics) corresponding to the dark-field light intensity. In this case, light is emitted at the distal end of a light guide element or LED in, for example, an endoscope, and passes through a light exit window (which defines a light exit area), preferably formed in the cap of the endoscope. As described above, the light behind the light exit window (behind the light exit area), i.e., the light that has passed through the light exit window, is called the light intensity. For example, due to haze, scratches, or contamination, some light is scattered as it passes through the light exit window, i.e., the original beam path is altered. Therefore, simply put, the light intensity can be understood as having two components: light with a (almost) unchanged beam path (no scattering at the light exit window) and light scattered at the light exit window. The dark-field light detection unit is arranged in the measuring device such that light with a (almost) unchanged beam path does not illuminate or incident on the dark-field light detection unit. However, the dark field light detection unit is arranged in the measuring device such that scattered light or a portion of the scattered light illuminates or is incident on the dark field light detection unit. This light illuminating the dark field light detection unit is called the dark field light intensity.

[0045] In this way, the dark field light is scattered in the light-emitting area of ​​the light-emitting window and illuminates the dark field light detection unit. As described above, the dark field light detection unit is arranged in the dark field of the light-emitting window. Furthermore, in this case, the processing unit is adapted to at least readjust the preset maximum luminous intensity and / or output information about the reflectivity of the light-emitting window based at least on the determined characteristic parameters or the determined dark field characteristic parameters.

[0046] The use of a dark-field light detection unit allows for the acquisition of additional information regarding the potential deterioration status of the endoscopic apparatus. Specifically, the condition and impact of the light exit window can be assessed. Therefore, the assessment and treatment of potential deterioration can be additionally specified.

[0047] Furthermore, if the reflectance exceeds a predetermined threshold (predetermined reflectance threshold), the processing unit can also be adapted to prevent readjustment of the preset maximum luminance.

[0048] As stated above, this means that the existing degradation of the endoscopic device and / or endoscopic illumination may have progressed to such an extent that readjustment of the preset maximum luminous intensity cannot compensate for the loss / luminous intensity caused by this advanced degradation.

[0049] The advantage of this adaptation of the processing unit is that if, for example, replacing or polishing / cleaning the light exit window (and / or alternatively, the camera's light entrance window) is deemed beneficial in reducing the detected reflectivity, thereby reducing the existing photometric loss, then there is no need to readjust the preset maximum photometric intensity. Therefore, the additional requirement or use of the light source and at least one optical element (e.g., optical fiber) due to readjusting the preset maximum photometric intensity can be avoided.

[0050] The light detection unit can also be adapted to determine multiple characteristic parameters at different time points. In this case, the processing unit is also adapted to derive degradation information based on multiple characteristic parameters and readjust the preset maximum luminance based on the degradation information.

[0051] In this way, statistical evaluation can be further specified, for example, taking into account the temporal variation of potential photometric loss.

[0052] Furthermore, the light detection unit can also be adapted to determine multiple dark field characteristic parameters at different time points. In this case, the processing unit is also adapted to derive dark field degradation information based on the multiple dark field characteristic parameters, and readjust the preset maximum luminance based on the dark field degradation information.

[0053] In this way, additional statistical evaluation can be specified.

[0054] In addition, the processing unit may also be adapted to terminate the readjustment and / or determine to replace at least one of the optical elements, light emission areas, or light sources when the readjustment of the preset maximum light intensity reaches the replacement indication state.

[0055] In this way, alternative actions or procedures can be identified, and their implementation can make it possible to eliminate the degradation that has already occurred, even if it cannot be achieved or compensated for by readjusting the preset maximum luminosity.

[0056] Furthermore, as mentioned above, the replacement indication state can be associated with preventing or interrupting the readjustment of the preset maximum illumination. This means that the degradation of the endoscopic device and / or the components of the endoscopic illumination (e.g., at least one optical element) may have reached the replacement indication state, for example, if the existing degradation has progressed to the point where (further) readjustment of the preset maximum illumination cannot / cannot compensate for the resulting loss / illuminance (see also the damage threshold and reflectance threshold given above). As shown below, reaching the replacement indication state can lead to the termination of readjustment and / or the determination of alternative actions or procedures, etc.

[0057] For example, this replacement indication state can be reached if the preset maximum light intensity has already been readjusted to a predetermined maximum readjustment light intensity (so that continued readjustment may damage the light source or the light emitter of the endoscope device). Alternatively or additionally, for example, when multiple degraded fibers of the fiber bundle, such as broken fibers, reach a predetermined (fiber bundle) damage threshold and / or when contamination, scratches, and / or haze affecting the light exit area (e.g., the light exit window or extension optics) and / or the lens surface (e.g., the extension optics) reach a predetermined damage threshold and / or reflectivity threshold, readjustment of the preset maximum light intensity can be prevented or interrupted from this predetermined threshold. Alternatively or additionally, the processing unit can determine a suggested / alternative action or procedure that may be improving the affected components of the endoscope device and / or the endoscope illumination (where possible). For each such component, such as the fibers of the fiber bundle, the light exit area, the lens surface, and / or the extension optics, the predetermined damage threshold can be used to determine whether to continue readjustment. For example, a predetermined damage threshold could be a non-luminous fiber, such as the number or quantity of broken fibers, such as at least 70%, 80%, or 90% (or any other threshold not mentioned herein). This means, for example, that if 70% or more of the fibers are broken, readjustment of the preset maximum luminous intensity is prevented or interrupted. In cases where contamination, scratches, and / or haze affect the light-emitting area, lens surface, and / or extended optics, a predetermined damage threshold can be defined, for example, based on a degraded and / or prepared reference element. Existing damage thresholds can be determined by comparison with such a reference element. Furthermore, existing damage thresholds can be understood as characteristic parameters determined by the measuring device.

[0058] Therefore, the processing unit can be configured to make a decision about whether to perform or continue readjustment to a preset maximum light intensity, or whether to prevent or interrupt readjustment. If the processing unit decides to prevent readjustment, the processing unit (as already mentioned) can also be adapted to determine an alternative action or procedure. For example, an alternative action or procedure could be replacing the fiber bundle, replacing the light emission area, the lens surface and / or expanding the optics, or replacing the endoscope's light source or the light emitter. As previously stated, an alternative action or procedure can be determined when a predetermined damage threshold is reached. Regarding the light source or the light emitter, reaching a predetermined deviation from a predetermined reference light intensity may lead to a recommendation to replace the light source or the light emitter. Attached Figure Description

[0059] Figure 1 An endoscope with an mountable measuring device is schematically shown according to a first embodiment of the present disclosure;

[0060] Figure 2An endoscope using an Ulbricht sphere as an mountable measuring device is schematically shown according to a second embodiment of the present disclosure;

[0061] Figure 3 An endoscope having an mountable measuring device is schematically shown according to a third embodiment of the present disclosure; and

[0062] Figure 4 An endoscope with an mountable measuring device is schematically shown according to a fourth embodiment of the present disclosure. Detailed Implementation

[0063] A measuring device at the distal end of an endoscope for detecting light output power or luminance can be used to maintain an initially set light output power when the light output power decreases, provided that the thermal limit at the distal end of the endoscope does not exceed the risk to the subject being examined (e.g., the body cavity of the patient being examined). This can be achieved by readjusting or correcting the light source associated with the endoscope (which may be formed or implemented as an internal or external light source) based on characteristic parameters (e.g., characteristic values ​​or characteristic quantities or properties) corresponding to the degree of degradation, which the endoscope generates light emitted at the distal end of the endoscope.

[0064] Possible types of degradation anticipated with endoscope devices include reduced light source power and haze (e.g., turbidity) or contamination (e.g., dirt or stains / stains) of optical elements, such as light-guiding elements of existing extended optics (e.g., extended lenses), such as optical fibers, and / or existing light exit windows (light output windows) (and / or light entrance windows (light entry windows) in the case of an internal camera within the endoscope lens). When using optical fibers, fiber breakage must also be considered.

[0065] In this document, embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0066] Figure 1 An endoscope 100 having a measuring device 101 according to a first embodiment of the present disclosure is schematically shown, for example, the measuring device 101 may be mounted, placed or powered.

[0067] Specifically, Figure 1 An installable measuring device 101 is shown, which includes telecentric lenses (telecentric objectives) 11a, 11b and a light detection unit 102.

[0068] In this embodiment, a telecentric lens comprising two lenses 11a and 11b is arranged such that, after the measuring device 101 has been mounted on the endoscope lens 100, the central axis M of the first lens 11a in the direction of light propagation (the amount of light generated by a light source (not shown), for example a portion or a small portion, which is transmitted via light guides 110a, 110b, which in this embodiment serve as at least one optical element and emit or output at their distal ends in the endoscope lens 100, and have passed through an extension (or extender) optics (e.g., an extension lens) 40 and a light exit window (light output window) 120, which in this embodiment also serve as optical elements and emit or output behind the light exit window defining the light exit region (light output region), the central axis M of the second lens 11b in the direction of light propagation, and the central axis M of the endoscope lens 100 in the direction of light propagation coincide (overlap with each other). Each of the two lenses 11a and 11b has a first side on which light is incident or irradiated and a second side on which light exits the respective lens. The first side and the second side are located on opposite sides of the relevant lenses. The first side faces the endoscope lens 100. Light is incident on the first side of the first lens 11a, exits through the second side of the first lens 11a (considering losses where applicable), illuminates the first side of the second lens 11b, exits through the second side of the second lens 11b (considering losses where applicable), and then illuminates the light detection unit 102.

[0069] The endoscope 100 in this embodiment includes two light guides composed of optical fibers (two fiber bundles of individual optical fibers) 110a and 110b. The endoscope 100 outputs light generated by a light source (not shown) and guided forward via light guides 110a and 110b from a light-emitting region at the distal end of the endoscope device, through an associated light-emitting window 120 defining the light-emitting region, via a corresponding expanding (or extender) optics (e.g., an expanding lens) 40 disposed in a recess of the endoscope 100. The light-emitting window 120 is part of a cap or cover (not shown) of the endoscope 100. However, the use of the measuring device 101 is not limited to the use of optical fibers or fiber bundles. According to modifications of this embodiment, for example, the optical fiber or fiber bundle can generally be represented or implemented as a light guide element or medium, or can be replaced by an internal endoscope light source such as an LED or by an arrangement of multiple internal endoscope light sources.

[0070] As described above, the light exit window 120 can be integrated into a cap that can be inserted into or fitted onto the endoscope lens 100. This cap should be understood as an accessory, top, or cover that can be inserted into or fitted onto the endoscope lens 100, and includes the light exit window 120 (or light entrance window) at the location where light is emitted from the endoscope lens 100 (light enters the endoscope lens 100, for example, for an internal camera). Each light exit window 120 forms a light exit region (light output region). The light emitted through the light exit region (the amount of emitted light) has a luminous intensity or light output power that is less than the maximum luminous intensity emitted by a light source (not shown) near the endoscope device at light guides 110a and 100b and transmitted through or coupled into light guides 110a and 100b due to losses occurring in the light guides. For the purpose of terminology distinction, the light emitted from the light-emitting area at the distal end of the endoscope device is referred to below as the light intensity (a small portion or a fraction of the light) emitted by the endoscope's light source, wherein the light intensity emitted by the endoscope's light source can typically be adjusted to a preset maximum intensity. In this case, the preset maximum intensity of the endoscope's light source should be readjusted to compensate for light intensity loss, for example, due to degradation, so that the light intensity is not lower than a predetermined minimum intensity.

[0071] A telecentric lens, comprising two lenses 11a and 11b, is arranged such that light passes through lenses 11a and 11b and illuminates or is incident on the light detection unit 102. In this embodiment, the light detection unit 102 is an imaging sensor system. However, the light detection unit 102 is not limited to an imaging sensor system; for example, in a variation of this embodiment, it may be a photoelectric sensor.

[0072] exist Figure 1 In this system, the imaging sensor system (light detection unit 102) is adapted to determine image data based on the amount of incident light as a characteristic parameter. The image data may indicate, but is not limited to, (maximum, minimum) light intensity values ​​or light intensity distribution, (maximum, minimum) contrast values ​​or contrast distribution (e.g., the contrast between a cross section emitting light of different intensities and a cross section that does not emit light), and / or (maximum, minimum) luminance values ​​or luminance distribution. Additionally, the imaging sensor system allows, for example, image information to be obtained as characteristic parameters from generated or acquired images (or multiple such images) from the distal end of the endoscope lens 100 and / or the light exit window 120, which includes an extended optics 40 located behind the latter and a light guide 110a (110b) behind it.

[0073] It should be noted here that the basis shown is... Figure 1In this embodiment, the light emitted by light guides 110a and 110b is collimated or focused onto several pixels of the imaging sensor system (light detection unit 102). As a result, only a portion / small portion of all pixels is illuminated, and data usable for evaluation can be obtained. The degradation or reduction in luminance of the amount of light emitted from the light-emitting region can then be statistically detected over time, for example, from the sum of all pixel intensities (i.e., individual pixel values) related to various values ​​of brightness control (exposure time, gain). Furthermore, image dynamics (e.g., contrast) evaluation based on the image allows conclusions to be drawn regarding contamination and / or haze / affecting the light-emitting window 120. Appropriate brightness control should be considered to avoid overexposure of these few pixels.

[0074] Specifically, Figure 1 The diagram illustrates the possibility that light guides 110a and 110b include a first light guide 110a and a second light guide 110b, and the cross-section of the imaging sensor system 102 illuminated by incident light includes a first cross-section and a second cross-section, wherein a first portion of the light emitted via the first light guide 110a (attributed to the first light guide 110a) illuminates the first cross-section of the imaging sensor system 102, and a second portion of the light emitted via the second light guide 110b (attributed to the second light guide 110b) illuminates the second cross-section of the imaging sensor system 102. The first and second cross-sections of the imaging sensor system 102 do not overlap. However, the imaging sensor system 102 is not limited to... Figure 1 The structure shown can be formed or implemented, for example, by two separate imaging sensors (one corresponding to the first cross section and one corresponding to the second cross section).

[0075] The processing unit (not shown) is adapted to readjust a preset maximum luminance based on the generated image data in this embodiment, based on the determined feature parameters. Figure 1 The illustrated structure allows for the acquisition of characteristic parameters or image data of the first light guide 110a and the second light guide 100b, enabling differentiation or individual readjustment. For example, an individual brightness value can be compared to a predetermined reference brightness value (e.g., the percentage deviation of an individual brightness value from a reference brightness value). The reference brightness value can be a brightness value that has been determined for the light guide (typically for optics used in endoscopes) and is free from any degradation effects.

[0076] Typically, for example, Figure 1The illustrated structure allows for the acquisition, for example, of at least one image of the ends of the light guides 110a and 100b in an emitting state, based on image data. If the image shows the ends of the light guides 110a and 100b in an emitting state, the ratio of the emitting area of ​​the ends to the total area of ​​the ends can be determined, for example, based on this image as image information (considered a characteristic parameter in this embodiment) for comparison with an image of the ends in a non-emitting state (e.g., a reference image). The greater the deviation of the thus determined ratio from the ideal value of 1, for example, the greater the probability that a single optical fiber will be degraded and therefore break.

[0077] Figure 2 An endoscope 100 having an Ulbricht sphere (integrating sphere) as an mountable measuring device 101 is schematically shown according to a second embodiment of the present disclosure.

[0078] Specifically, Figure 2 The structure shown is Figure 1 The difference in the structure shown is that, Figure 2 A Ulbricht sphere is shown as an mountable measuring device 101, wherein the Ulbricht sphere has a diffusely reflective inner surface 21 adapted to diffusely reflect light before it is incident on or onto a light detection unit 103, which is implemented as or formed of a photodetector. The photodetector can be adapted to determine the result of a luminous flux measurement as a characteristic parameter. For example, if a certain luminous flux is determined as a characteristic parameter, degradation information can be obtained based on time variations and / or comparison with one (or more) predetermined reference luminous flux values. The reference luminous flux values ​​can be determined such that they indicate the expected luminous flux of the light guide (an optical element typically used in endoscopes) without degradation effects.

[0079] Figure 3 An endoscope 100 having an mountable measuring device 101 is schematically shown according to a third embodiment of the present disclosure.

[0080] Specifically, Figure 3 The structure shown is Figure 1 The difference in the structure shown is that, Figure 3 Instead of a telecentric lens, it has a diffuser 31, and as a light detection unit 103, it does not have an imaging sensor system but instead has a photoelectric sensor, similar to... Figure 2 An example of a Ulbricht sphere. The luminous flux measured by the photoelectric sensor and... Figure 2 The embodiments shown are similar.

[0081] Figure 4 An endoscope 100 having an mountable measuring device 101 is schematically shown according to a fourth embodiment of the present disclosure. Specifically, Figure 4The structure shown is Figure 3 The difference in the structure shown is that, Figure 4 The structure shown also includes a dark-field light detection unit 41. In the embodiment shown here, the dark-field light detection unit 41 is a photoelectric sensor and can be adapted to determine the result of dark-field light flux measurement as a characteristic parameter.

[0082] Due to factors such as haze, scratches, or contamination, some of the light emitted by the light guides 110a and 110b in this embodiment is scattered after passing through the extended optics 40 and then through the light exit window 120; that is, the original beam path is altered. The dark-field light detection unit 41 is disposed in the measuring device 101 (located in the dark field of the light exit window 120) such that light with a (virtually) unchanged beam path does not illuminate the dark-field light detection unit 41, but light scattered at the light exit window 120 does indeed illuminate it. Furthermore, the dark-field light detection unit 41 is disposed in the measuring device 101 such that light also scattered or diffused by the diffuser 31 does not illuminate the dark-field light detection unit 41. Figure 4 As shown, the measuring device 101 may have two chambers K1 and K2. The first chamber K1 is bounded on one side by the endoscope 100 mounted to the measuring device 101, and includes a diffuser 31 and a photoelectric sensor (light detection unit 103). The second chamber K2 is connected to the first chamber K1 via a linear or straight channel and includes a dark-field light detection unit 41. The channel is oriented such that the first of the two openings of the channel faces the dark-field light detection unit 41, and the second of the two openings of the channel faces the light exit window 120, wherein the second opening of the channel is arranged between the light exit window 120 and the diffuser 31.

[0083] For example, the measured dark-field luminous flux can provide information about the degree of contamination, scratches, or haze on the light exit window 120. Similar to the reference comparison described above, comparisons with a predetermined reference dark-field luminous flux value (e.g., percentage deviation) are possible. The reference dark-field luminous flux value can be determined in such a way that it indicates the expected luminous flux of the light exit window 120 without any degrading effect.

[0084] Similarly, the dark field light detection unit 41 can also be used in principle to assess the degree of degradation of the extended optics 40.

[0085] Reference Symbol List

[0086] 11a, 11b: First and second lenses of the telecentric lens; 21: Diffuse inner surface; 31: Diffuser; 40: Extended optics (extended lens); 41: Dark field light detection device; 100: Endoscopic lens; 101: Measuring device; 102: Light detection device; Imaging sensor system; 103: Light detection device; Photoelectric sensor; 110a: First light guide; 110b: Second light guide; 120: Light exit window; K1: First chamber; K2: Second chamber; M: Central axis.

Claims

1. An endoscope device, comprising a measuring device (101) adapted to be mounted on the endoscope lens of the endoscope device for determining characteristic parameters of the endoscope illumination of the endoscope device. The endoscopic illumination includes at least one optical element through which light passes. The measuring device includes a light detection unit (102, 103) suitable for determining characteristic parameters, wherein The endoscope (100) includes a light-emitting area, through which the endoscope illumination outputs light emitted from a light source. The luminous intensity of the light emitted from the light source reaches a preset maximum luminous intensity. The characteristic parameters are based on the amount of light incident on the light detection units (102, 103); and The processing unit is adapted to readjust the preset maximum luminosity based on the determined characteristic parameters. The amount of light emitted from the at least one optical element and incident on the light detection unit (102, 103) illuminates the cross section of the light detection unit (102, 103), and The area of ​​the cross section is greater than or equal to the area of ​​the cross section of the at least one optical element. The light detection units (102, 103) are also adapted to measure the luminous area of ​​the at least one optical element and determine the ratio of the luminous area of ​​the at least one optical element to the non-luminous area of ​​the at least one optical element.

2. The endoscope device including the measuring device (101) according to claim 1, characterized in that, The light source Integrated into the endoscope device or Suitable for connection to the endoscope device.

3. The endoscopic device including the measuring device (101) according to claim 1 or 2, characterized in that, The processing unit is also adapted to readjust the preset maximum luminance so that the luminance of the light quantity is equal to or less than a predefined luminance threshold.

4. The endoscopic device including the measuring device (101) according to claim 1 or 2, characterized in that, The endoscope illumination includes a light guide (100a, 100b) as at least one optical element, the light guide being adapted to guide light from the light source to the endoscope lens, wherein the amount of light is emitted from the light emitting region.

5. The endoscopic device including the measuring device (101) according to claim 4, characterized in that, The endoscope illumination includes an extended optics (40) as another optical element and / or a light exit window (120), the light exit area being formed by the extended optics (40), or the light exit area being formed by the light exit window (120) as long as the endoscope illumination includes the light exit window (120) as the other optical element.

6. The endoscopic device including the measuring device (101) according to claim 1, characterized in that, The light detection unit (102) is an imaging sensor system, and The at least one optical element includes a first optical element and a second optical element, and the cross section of the light detection unit (102) irradiated by the incident light includes a first cross section and a second cross section, wherein a first portion of the light emitted via the first optical element irradiates the first cross section of the light detection unit (102), and a second portion of the light emitted via the second optical element irradiates the second cross section of the light detection unit (102), and the first cross section and the second cross section do not overlap each other.

7. The endoscopic device including the measuring device (101) according to claim 6, characterized in that, The processing unit is further adapted to distinguish the first optical element and the second optical element based on the difference in characteristic parameters obtained from the first cross-section and the second cross-section, and The preset maximum luminous intensity of the first optical element and the second optical element are readjusted respectively.

8. The endoscopic apparatus including the measuring device (101) according to any one of claims 1, 2, 6, and 7, characterized in that, The measuring device (101) further includes telecentric lenses (11a, 11b), which are arranged such that light passes through the telecentric lenses (11a, 11b) after passing through the light emission area and is incident on the light detection units (102, 103) arranged in the measuring device (101).

9. The endoscopic device including the measuring device (101) according to claim 8, characterized in that, The light detection unit (102) may be an imaging sensor system, and is also adapted to determine image data based on the amount of light incident on the imaging sensor system as a feature parameter.

10. The endoscopic apparatus including the measuring device (101) according to claim 9, characterized in that, The imaging sensor system captures at least one image of the end of at least one optical element in a light-emitting state, and, The processing unit is also adapted to derive a small portion of the luminous area of ​​the end relative to the total area of ​​the end as image information based on the at least one image, and / or Provided that the endoscope device includes the light guides (110a, 110b) according to claim 4, and the light guides (110a, 110b) include a plurality of optical fibers, The degree of degradation of the plurality of optical fibers, and / or Some of the defective and / or defect-free optical fibers among the plurality of optical fibers, and / or As long as the light emission area is covered by the light emission window (120), The processing unit is also adapted to derive the degree of damage to the light exit window (120) as image information based on the at least one image, the degree of damage being at least one of contamination, scratches, or haze.

11. The endoscopic apparatus including a measuring device (101) according to claim 10, characterized in that, The processing unit is also adapted to readjust the preset maximum luminosity when the degree of degradation exceeds a preset threshold, and / or Provided that the endoscope device includes the light guides (110a, 110b) according to claim 4, and the light guides (110a, 110b) include a plurality of optical fibers, If the number of defective optical fibers exceeds a preset threshold, then...

12. The endoscope device including the measuring device (101) according to claim 10, characterized in that, If the degree of damage to the light exit window (120) exceeds a preset threshold for the degree of damage, the processing unit is also adapted to prevent the readjustment of the preset maximum luminance.

13. The endoscopic apparatus including the measuring device (101) according to claim 1 or 2, characterized in that, The measuring device (101) further includes an Ulbricht sphere having a diffuse inner surface (21) adapted to diffusely reflect light before it is irradiated by the light detection unit (103), which is a photoelectric sensor.

14. The endoscopic apparatus including the measuring device (101) according to claim 1 or 2, characterized in that, The measuring device (101) also includes a diffuser (31) adapted to diffusely reflect light opaquely before it is incident on the light detection unit (103), which is a photoelectric sensor.

15. The endoscopic apparatus including a measuring device (101) according to claim 14, characterized in that, The measuring device (101) further includes a dark field light detection unit (41), which is adapted to determine dark field characteristic parameters corresponding to the dark field light intensity of the light intensity. The dark field light intensity diffuses at the light emission window (120) covering the light emission area and illuminates the dark field light detection unit. The dark field light detection unit (41) is disposed within the dark field of the light emission window (120), and The processing unit is also adapted to, at least based on the determined feature parameters or the determined dark field feature parameters, at least Readjust the preset maximum light intensity or Output information about the reflectivity of the light exit window (120).

16. The endoscopic apparatus including a measuring device (101) according to claim 15, characterized in that, The processing unit is also adapted to prevent readjustment of the preset maximum luminance if the reflectance exceeds a predetermined threshold of the reflectance.

17. The endoscopic apparatus including the measuring device (101) according to any one of claims 1, 2, 6, and 7, characterized in that, The optical detection units (102, 103) are also adapted to determine multiple feature parameters at different time points, and The processing unit is also adapted to derive degradation information based on the plurality of feature parameters, and to readjust the preset maximum luminosity based on the degradation information.

18. The endoscopic apparatus including a measuring device (101) according to claim 15, characterized in that, The light detection unit (102, 103) is also adapted to determine multiple feature parameters at different time points, and the processing unit is also adapted to derive dark field degradation information based on the multiple dark field feature parameters, and to readjust the preset maximum luminosity based on the dark field degradation information.

19. The endoscopic apparatus including the measuring device (101) according to any one of claims 1, 2, 6, and 7, characterized in that, The processing unit is also adapted to terminate the readjustment and / or determine to replace at least one of the optical element, light emission area, or light source when the readjustment of the preset maximum luminance reaches the replacement indication state.

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