CN218960690U - Light source device, endoscope, and endoscope imaging system - Google Patents

Abstract

The utility model provides a light source device, an endoscope and an endoscope imaging system. The light source device includes a light source main body including: the light guide seat is provided with a first through hole for inserting the photoacoustic excitation light source interface of the endoscope and a second through hole for inserting the illumination light source interface of the endoscope; the output end of the photoacoustic excitation light guide part is optically coupled to the photoacoustic excitation light source interface of the endoscope, and the photoacoustic excitation light guide part is used for conducting photoacoustic excitation light; and an illumination module optically coupled to the endoscope illumination source interface. Such a light source device can provide not only photoacoustic excitation light for an endoscope having a photoacoustic imaging mode but also illumination light for an endoscope having an optical imaging mode, and can support an endoscope having a plurality of imaging modes such as optical and photoacoustic, providing an important tool for disease diagnosis and treatment. And the connection between the prior light source device and the endoscope is similar, thus greatly facilitating the operation of users.

Description

Light source device, endoscope, and endoscope imaging system

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a light source device, an endoscope and an endoscope imaging system.

Background

The endoscopic imaging is used as a noninvasive imaging method, can effectively prolong the human sight, is widely applied to image diagnosis and image-guided treatment in various fields such as digestive tracts, cardiovascular and cerebrovascular systems, urinary systems, respiratory systems and the like, and greatly promotes the examination precision of diseases.

In recent years, multi-modal endoscopic imaging techniques, such as optical imaging techniques, photoacoustic imaging techniques, and the like, have been rapidly developed. The optical imaging technology has the characteristic of high resolution, but because tissues have strong scattering property on light, the imaging depth of the electronic endoscope is limited to be within 1 millimeter, and the deep lesions cannot be accurately detected. Photoacoustic imaging techniques are used to excite ultrasound waves (photoacoustic signals) by directing photoacoustic excitation light into a biological lumen through an endoscopic probe, and then to image tissue by receiving the generated ultrasound signals through a miniature ultrasound transducer placed within an endoscopic catheter. The photoacoustic imaging technology can make up for the defect of shallow detection depth in pure optical imaging.

In order to guide both photoacoustic excitation light (typically pulsed laser light) for photoacoustic imaging and illumination light for optical imaging into an endoscope, such a multi-mode endoscope of the related art needs to be connected to an illumination light source and a photoacoustic excitation light source through different optical fibers, respectively, which may cause a relatively complicated operation of connecting the endoscope to the light source.

Disclosure of Invention

In order to solve at least partially the problems occurring in the prior art, according to one aspect of the present utility model, there is provided a light source device including a light source body including: the light guide seat is provided with a first through hole for inserting the photoacoustic excitation light source interface of the endoscope and a second through hole for inserting the illumination light source interface of the endoscope; the output end of the photoacoustic excitation light guide part is optically coupled to the photoacoustic excitation light source interface of the endoscope, and the photoacoustic excitation light guide part is used for conducting photoacoustic excitation light; and an illumination module optically coupled to the endoscope illumination source interface. In the light source device provided by the utility model, the photoacoustic excitation light guide part optically couples the photoacoustic excitation light to

A first through hole through which photoacoustic excitation light can be used for photoacoustic imaging of the endoscope; the illumination module couples illumination light 5, which can be used for optical imaging of the endoscope, to the second through hole. Such a light source device does not

Only the endoscope with the photoacoustic imaging mode can be provided with photoacoustic excitation light, and the endoscope with the optical imaging mode can be provided with illumination light, and the endoscope with multiple imaging modes such as optics, photoacoustic and the like can be supported, so that an important tool is provided for disease diagnosis and treatment. Furthermore, the photoacoustic excitation light guide

The photoacoustic excitation light conducted by the light part and the illumination light emitted by the illumination module are mutually noninterfere. In addition, the connection between the light source device and the endoscope is similar to that of the prior endoscope with only optical imaging mode

The connection of the mirror to the light source device is similar, greatly facilitating the operation of the user.

Illustratively, the light source body further includes a housing, the light guide is disposed on the housing, and the lighting module is disposed in the housing.

Illustratively, the casing is provided with a threading opening through which the photoacoustic excitation light guide passes, the exit end of the photoacoustic excitation light guide is located within the casing, and the incident end of the photoacoustic excitation light guide is located within the casing

Outside the body.

Illustratively, the photoacoustic excitation light guide includes an inner photoacoustic excitation light guide located inside the housing and an outer photoacoustic excitation light guide located outside the housing, the inner and outer photoacoustic excitation light guides being optically coupled by the first coupling portion.

Illustratively, the light source body further includes a second coupling portion optically coupled to the photoacoustic excitation

Between the exit end of the excitation light guide portion and the endoscope photoacoustic excitation light source interface, a spot focus of the photoacoustic excitation light coupled from the second coupling portion is located at an incident end face of the endoscope photoacoustic excitation light source interface.

Illustratively, the light source body includes a third coupling portion optically coupled to the lighting module

And the spot focus of the illumination light coupled from the third coupling part is positioned at the incidence end face of the endoscope illumination light source interface.

The light source device further includes a photoacoustic excitation light source optically coupled to an incident end of the photoacoustic excitation light guide portion.

Illustratively, the photoacoustic excitation light source is disposed separately from the light source body.

According to another aspect of the present utility model there is provided an endoscope comprising a connector for mating with any of the light source arrangements as hereinbefore described, the connector comprising an endoscope photoacoustic excitation light source interface and an endoscope illumination light source interface.

According to a further aspect of the present utility model there is provided an endoscopic imaging system comprising any one of the light source devices as above and/or an endoscope as above.

In the summary, a series of concepts in a simplified form are introduced, which will be further described in detail in the detailed description section. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

Advantages and features of the utility model are described in detail below with reference to the accompanying drawings.

Drawings

The following drawings are included to provide an understanding of the utility model and are incorporated in and constitute a part of this specification. Embodiments of the present utility model and their description are shown in the drawings to explain the principles of the utility model. In the drawings of which there are shown,

fig. 1 is a schematic light path diagram of a light source device according to a first exemplary embodiment of the present utility model;

fig. 2 is a schematic light path diagram of a light source device according to a second exemplary embodiment of the present utility model;

FIG. 3 is an optical path diagram of an endoscope according to an exemplary embodiment of the present utility model;

FIG. 4 is a schematic view of the endoscope shown in FIG. 3 connected to the light source device shown in FIG. 1; and

fig. 5 is a schematic view of the endoscope shown in fig. 3 connected to the light source device shown in fig. 1.

Wherein the above figures include the following reference numerals:

100. a light guide base; 110. a first through hole; 120. a second through hole; 200. 200', a photoacoustic excitation light guide; 201. an incident end; 202. an exit end; 210. an internal photoacoustic excitation light guide section; 220. an external photoacoustic excitation light guide section; 230. a first coupling part; 240. a second coupling part; 250. a third coupling section; 130. a lighting module; 140. a housing; 141. a threading opening; 20. a photoacoustic excitation light source; 30. an endoscope; 31. an endoscope photoacoustic excitation light source interface; 32. an endoscope illumination light source interface; 33. a head end portion; 331. a photoacoustic excitation light window; 332. an illumination light window; 341. a first optical fiber; 342. and a second optical fiber.

Detailed Description

In the following description, numerous details are provided to provide a thorough understanding of the utility model. However, it will be understood by those skilled in the art that the following description illustrates preferred embodiments of the utility model by way of example only and that the utility model may be practiced without one or more of these details. Furthermore, some technical features that are known in the art have not been described in detail in order to avoid obscuring the utility model.

According to an aspect of the present utility model, there is provided a light source device. The light source device may be used for an endoscope to which a connector of the endoscope may be connected. The light source device can provide and/or conduct illumination light and photoacoustic excitation light simultaneously, that is, the connector of the endoscope only needs to be connected to the light source device, and the endoscope can receive the illumination light and the photoacoustic excitation light by the light source device without being connected to the illumination light source and the photoacoustic excitation light source by optical fibers, respectively.

A light source device provided according to an exemplary embodiment of the present utility model will be described below with reference to the accompanying drawings. As shown in fig. 1, the light source device may include a light source body 10. The light source body 10 may include a light guide 100, a photoacoustic excitation light guide part 200, and an illumination module 130. Fig. 3 shows the optical path of an endoscope used in cooperation with the light source device. As shown in fig. 3, the endoscope 30 includes an endoscope photoacoustic excitation light source interface 31 and an endoscope illumination light source interface 32. The head end 33 of the endoscope 30 may be provided with a photoacoustic excitation light window 331 and an illumination light window 332. The photoacoustic excitation light window 331 is optically coupled to the endoscope photoacoustic excitation light source interface 31 through a first optical fiber 341. The illumination light window 332 is optically coupled to the endoscope illumination light source interface 32 by a second optical fiber 342.

Referring to fig. 1, the light guide base 100 may be provided with a first through hole 110 into which the endoscope photoacoustic excitation light source interface 31 is inserted and a second through hole 120 into which the endoscope illumination light source interface 32 is inserted. The endoscope photoacoustic excitation light source interface 31 and the endoscope illumination light source interface 32 are typically provided on the connector of the endoscope 30, and the connector of the endoscope 30 may be locked to the light source body 10, for example, to the light guide 100, in various suitable ways to ensure reliable connection of the endoscope photoacoustic excitation light source interface 31 and the endoscope illumination light source interface 32 with the first through hole 110 and the second through hole 120, respectively. The incident end face of the photoacoustic excitation light source interface 31 of the endoscope after being inserted into the first through hole 110 may be located in the first through hole 110 or may be located inside the light source main body 10 beyond the first through hole 110. Similarly, the incident end face of the endoscope illumination light source interface 32 may be located in the first through hole 110 after being inserted into the second through hole 120, or may be located inside the light source main body 10 through the first through hole 110.

The exit end 202 of the photoacoustic excitation light guide 200 may be optically coupled to the endoscope photoacoustic excitation light source interface 31 and the photoacoustic excitation light guide 200 may be used to conduct photoacoustic excitation light. Illustratively, the photoacoustic excitation light guide 200 may include single mode fibers and/or multimode fibers. The incident end of the photoacoustic excitation light guide 200 may be optically coupled to the photoacoustic excitation light source 20 outside the light source body 10. Photoacoustic apparatus

The photoacoustic excitation light emitted from the excitation light source 20 may be conducted to the first 5 through-hole 110 via the photoacoustic excitation light guiding portion 200. When the endoscope photoacoustic excitation light source interface 31 is connected to the first through hole 110 of the light source device

When the photoacoustic excitation light may be conducted to the endoscope photoacoustic excitation light source interface 31 and to the photoacoustic excitation light window 331 via the first optical fiber 341.

The illumination module 130 may be optically coupled to the endoscope illumination source interface 32. The lighting module 130 can

To emit illumination light. The illumination module 130 may include one or more of an endoscope LED cold light source, an endoscope halogen lamp 0 cold light source, an endoscope xenon lamp cold light source, and the like. The lighting module 130 generally includes a hair

Light elements, reflective tiles, and optical color filters. The illumination module 130 may provide illumination to the endoscope 30 that minimizes tissue heating effects. When the endoscope illumination light source interface 32 is inserted into the second through hole 120 of the light source device, illumination light is conducted to the endoscope illumination light source interface 32 and conducted to the illumination light window 332 via the second optical fiber 342.

5 it should be noted that the light source device may be provided for the endoscope only alternatively, if necessary

Photoacoustic excitation light or illumination light. Illustratively, endoscope 30 may include only endoscope photoacoustic excitation light source interface 31. The endoscope photoacoustic excitation light source interface 31 can receive only photoacoustic excitation light from the light source apparatus by being inserted into the first through hole 110. Alternatively, endoscope 30 may include only endoscope illumination

A light source interface 32. The endoscope illumination light source interface 32 can receive illumination light by the light source device by only 0 through insertion into the second through hole 120. Alternatively, if desired, the first and second through holes 110 and 120

Different endoscopes may be connected to each other.

In the light source device provided by the present utility model, the photoacoustic excitation light guide 200 optically couples photoacoustic excitation light to the endoscope photoacoustic excitation light source interface 31, and the photoacoustic excitation light can be used for light of the endoscope

Acoustic imaging; the illumination module 130 couples illumination light to the endoscope illumination source interface 32, and the illumination light 5 can be used for optical imaging of the endoscope. Such a light source device may not only be provided with a photoacoustic imaging die

The endoscope provides photoacoustic excitation light, can also provide illumination light for the endoscope with an optical imaging mode, can support the endoscope with multiple imaging modes such as optics, photoacoustic and the like, and provides an important tool for disease diagnosis and treatment. Furthermore, the photoacoustic excitation conducted by the photoacoustic excitation light guiding portion 200

The light and the illumination light emitted by the illumination module 130 do not interfere with each other. In addition, the connection of such a light source 0 device and an endoscope is similar to that of the existing endoscope having only an optical imaging mode, and the user operation is greatly facilitated.

Illustratively, the light source body 10 may further include a housing 140. The light guide 100 may be disposed on the housing 140, and the lighting module 130 may be disposed in the housing 140. Based on this, the existing light source device of the endoscope for optical imaging only can be modified to form a light source device capable of providing photoacoustic excitation light and illumination light as to be protected by the present application. The light guide 100 may be disposed on the housing 140 in various forms such as integrated molding, welding, clamping or screwing. The housing 140 may include a variety of shapes and structures, and is not particularly limited herein.

Illustratively, as shown in fig. 1, the casing 140 may be provided with a threading opening 141, the photoacoustic excitation light guiding portion 200 may pass through the threading opening 141, an exit end 202 of the photoacoustic excitation light guiding portion 200 may be located inside the casing 140, and an entrance end 201 of the photoacoustic excitation light guiding portion 200 may be located outside the casing 140. The incident end 201 of the photoacoustic excitation light guiding portion 200 is located outside the housing 140, and it is possible to facilitate connection of the photoacoustic excitation light guiding portion 200 with the external photoacoustic excitation light source 20. The outgoing end 202 of the photoacoustic excitation light guide 200 is located in the housing 140, and the outgoing position of the photoacoustic excitation light conducted by the photoacoustic excitation light guide 200 is also located in the housing 140, which can be beneficial to ensure that the spot focus of the photoacoustic excitation light is located at the end face of the incident end of the endoscope photoacoustic excitation light source interface 31. Furthermore, a complete optical fiber bundle or a complete optical fiber may be used as the photoacoustic excitation light guiding portion 200, and the structure of such a photoacoustic excitation light guiding portion 200 is more compact, and only the photoacoustic excitation light source 20 and the endoscope photoacoustic excitation light source interface 31 need be optically coupled at both ends of the photoacoustic excitation light guiding portion 200, respectively. Thus, the overall device structure can be made simpler.

Illustratively, as shown in fig. 2, the photoacoustic excitation light guide 200' may include an inner photoacoustic excitation light guide 210 located inside the housing and an outer photoacoustic excitation light guide 220 located outside the housing. The inner photoacoustic excitation light guide portion 210 and the outer photoacoustic excitation light guide portion 220 may be optically coupled through the first coupling portion 230. The incident end of the external photoacoustic excitation light guide 220 may be optically coupled to the external photoacoustic excitation light source 20. The photoacoustic excitation light emitted from the photoacoustic excitation light source 20 is conducted through the outer photoacoustic excitation light guiding portion 220, is coupled into the inner photoacoustic excitation light guiding portion 210 through the first coupling portion 230, and finally can be conducted to the first through hole 110 through the inner photoacoustic excitation light guiding portion 210. In this embodiment, the inner photoacoustic excitation light guide portion 210 and the outer photoacoustic excitation light guide portion 220 may be optical fibers independent of each other. The inner photoacoustic excitation light guiding portion 210 and the outer photoacoustic excitation light guiding portion 220 may be connected to each other by an optical fiber connector such as an FC connector. The first coupling part 230 may include the optical fiber connector. Of course, when the external photoacoustic excitation light guiding portion 220 is another type of light guiding portion, the first coupling portion 230 may have another configuration. The first coupling part 230 may be selected as desired by those skilled in the art. In the case where the outer photoacoustic excitation light guiding portion 220 is coupled to the inner photoacoustic excitation light guiding portion 210 through the first coupling portion 230, assembly of the outer photoacoustic excitation light guiding portion 220 and the housing 140 can be facilitated, and convenience in manufacturing and maintenance can be improved.

It should be noted that the same or similar components in the embodiment shown in fig. 2 are denoted by the same reference numerals as those in the embodiment shown in fig. 1, and in the interest of brevity, these same or similar components will not be described in detail herein. The main difference between the embodiment shown in fig. 2 and the embodiment shown in fig. 1 is that the photoacoustic excitation light guiding portion 200' is divided into inner and outer sections, as described above.

Referring back to fig. 1, illustratively, the light source body 10 may further comprise a second coupling portion 240, the second coupling portion 240 may be optically coupled between the exit end 202 of the photoacoustic excitation light guide 200 and the endoscope photoacoustic excitation light source interface 31. When the endoscope photoacoustic excitation light source interface 31 is inserted into place in the first through hole 110, the spot focus of the photoacoustic excitation light coupled from the second coupling part 240 may be located at the incident end face of the endoscope photoacoustic excitation light source interface 31. The second coupling portion 240 may be configured to facilitate adjustment of a spot focus of the photoacoustic excitation light, and may further ensure that the spot focus of the photoacoustic excitation light is located at an incident end surface of the photoacoustic excitation light source interface 31 of the endoscope, and the second coupling portion 240 may improve coupling efficiency of the photoacoustic excitation light into an optical fiber connected to the photoacoustic excitation light source interface 31 of the endoscope, and improve a utilization rate of the photoacoustic excitation light. Illustratively, the second coupling part 240 may include a focusing lens.

Illustratively, the light source body 10 may further include a third coupling portion 250, the third coupling portion 250 may be optically coupled between the illumination module 130 and the endoscope illumination light source interface 32. When the endoscope illumination light source interface 32 is inserted into place within the second through-hole 120, the spot focus of the illumination light coupled from the third coupling portion 250 may be located at the incident end face of the endoscope illumination light source interface 32. The third coupling portion 250 is configured to facilitate adjustment of a spot focus of the illumination light, and further ensure that the spot focus of the illumination light is located at an incident end face of the endoscope illumination light source interface 32, and the third coupling portion 250 can improve coupling efficiency of the illumination light coupled to an optical fiber connected to the endoscope illumination light source interface 32, and improve utilization rate of the illumination light. Illustratively, the third coupling part 250 may include a focusing lens.

Illustratively, the light source arrangement may further comprise a photoacoustic excitation light source 20. Photoacoustic excitation light source 20 may comprise a pulsed laser. The wavelength range of the pulse laser emitted by the pulse laser can be 140nm-220nm, the wavelength range covers the visible light wave band and the near infrared wave band, and the pulse width is 5ns-50ns. The types of pulsed lasers may include semiconductor lasers, solid state lasers, fuel lasers, or gas lasers. Preferably, the present application employs a solid state laser with an output wavelength of 527 nm. The photoacoustic excitation light source 20 may be optically coupled to the incident end 201 of the photoacoustic excitation light guide 200. For example, a fiber coupling collimator for coupling the pulse light emitted from the pulse laser into the optical fiber may be provided between the photoacoustic excitation light source 20 and the photoacoustic excitation light guiding portion 200. The fiber coupling collimator has an FC/APC splice fiber standard splice and is connectable to an optical fiber having an FC/APC splice. The pulse laser beam is expanded by the lens group and then is applied to the incident end face of the optical fiber coupling collimator, and the exit port of the optical fiber coupling collimator is connected with the photoacoustic excitation light guide part 200 of the optical fiber, for example. The fiber coupling collimator is precisely tuned to lock the degrees of freedom when the fiber output light energy is maximized. The coupling process improves the coupling efficiency of the photoacoustic excitation light into the optical fiber and improves the utilization rate of laser.

Illustratively, the photoacoustic excitation light source 20 may be provided separately from the light source body 10. Compared with the integral arrangement of the photoacoustic excitation light source 20 and the light source main body 10, the split arrangement can facilitate the separate overhaul of the photoacoustic excitation light source 20 and the light source main body 10 when the integral device has a problem.

According to another aspect of the present utility model, an endoscope is provided. As shown in fig. 3, the endoscope may include a connector for mating with any of the light source devices described above, which may include an endoscope photoacoustic excitation light source interface 31 and an endoscope illumination light source interface 32. The endoscope is connected with the light source device through the connector, and is similar to the connection mode in the prior art, the using habit of a user can not be changed, and the endoscope is friendly to the user.

According to yet another aspect of the present utility model, an endoscopic imaging system is provided. The endoscopic imaging system may comprise any one of the light source devices as described above and/or any one of the endoscopes as described above. Such an endoscopic imaging system can support a plurality of imaging modes, can support an endoscopic optical imaging mode, a photoacoustic imaging mode, and an optical-photoacoustic fusion imaging mode, and is helpful for improving the accuracy of disease diagnosis.

In the description of the present utility model, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front", "rear", "upper", "lower", "left", "right", "transverse", "vertical", "horizontal", and "top", "bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely for convenience of describing the present utility model and simplifying the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, without limiting the scope of protection of the present utility model; the orientation terms "inner" and "outer" refer to the inner and outer relative to the outline of the components themselves.

For ease of description, regional relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein to describe regional positional relationships of one or more components or features to other components or features illustrated in the figures. It will be understood that the relative terms of regions include not only the orientation of the components illustrated in the figures, but also different orientations in use or operation. For example, if the element in the figures is turned over entirely, elements "over" or "on" other elements or features would then be included in cases where the element is "under" or "beneath" the other elements or features. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". Moreover, these components or features may also be positioned at other different angles (e.g., rotated 90 degrees or other angles), and all such cases are intended to be encompassed herein.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, components, assemblies, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or described herein.

The present utility model has been illustrated by the above-described embodiments, but it should be understood that the above-described embodiments are for purposes of illustration and description only and are not intended to limit the utility model to the embodiments described. In addition, it will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that many variations and modifications are possible in light of the teachings of the utility model, which variations and modifications are within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims (10)

1. A light source device comprising a light source body, the light source body comprising:

the light guide seat is provided with a first through hole for inserting the photoacoustic excitation light source interface of the endoscope and a second through hole for inserting the illumination light source interface of the endoscope;

a photoacoustic excitation light guide portion, an exit end of which is optically coupled to the endoscope photoacoustic excitation light source interface, the photoacoustic excitation light guide portion being for conducting photoacoustic excitation light; and

and the illumination module is optically coupled to the endoscope illumination light source interface.

2. The light source device according to claim 1, wherein the light source main body further comprises a housing, the light guide is disposed on the housing, and the illumination module is disposed in the housing.

3. A light source device according to claim 2, wherein a threading opening is provided in the housing, the photoacoustic excitation light guide portion passes through the threading opening, an exit end of the photoacoustic excitation light guide portion is located in the housing, and an incident end of the photoacoustic excitation light guide portion is located outside the housing.

4. A light source device as recited in claim 2, wherein said photoacoustic excitation light guide comprises an inner photoacoustic excitation light guide located within said housing and an outer photoacoustic excitation light guide located outside said housing, said inner and outer photoacoustic excitation light guides being optically coupled by a first coupling portion.

5. A light source device as recited in claim 1, wherein the light source body further comprises a second coupling portion optically coupled between an exit end of the photoacoustic excitation light guide portion and the endoscope photoacoustic excitation light source interface, a spot focus of the photoacoustic excitation light from the second coupling portion being located at an incident end face of the endoscope photoacoustic excitation light source interface.

6. The light source device of claim 1, wherein the light source body comprises a third coupling portion optically coupled between the illumination module and the endoscope illumination light source interface, a spot focus of illumination light coupled from the third coupling portion being located at an incident end face of the endoscope illumination light source interface.

7. A light source device as recited in claim 1, further comprising a photoacoustic excitation light source optically coupled to an incident end of the photoacoustic excitation light guide.

8. A light source device according to claim 7, wherein the photoacoustic excitation light source is provided separately from the light source main body.

9. An endoscope comprising a connector for mating with the light source device of any one of claims 1-8, the connector comprising an endoscope photoacoustic excitation light source interface and an endoscope illumination light source interface.

10. An endoscopic imaging system comprising a light source device according to any one of claims 1-8 and/or an endoscope according to claim 9.

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