Endoscope sheath protection system

Abstract

The present application relates to an endoscope sheath protection structure, comprising an incident light module, an objective lens module, an imaging module, and a sheath coaxial module. The incident light module is configured for providing an incident light. The incident light is incident on a surface of an object of interest through the objective lens module, reflected by the surface of the object of interest, and propagated backwards through the objective lens module again to the imaging module for imaging processing. The sheath coaxial module comprises a seat, an internal sheath fixed to the seat, and an external sheath sheathing the internal sheath and fixed to the seat. The objective lens module is fixed to the front end of the internal sheath. The external sheath comprises a protection lens fixed to the front end of the external sheath.

Description

Endoscope sheath protection structure

[0001] Related applications

[0002] This application claims priority to Chinese patent application number 2024100771915, filed on January 18, 2024, entitled “Endoscope Sheath Protection Structure,” the entire text of which is hereby incorporated by reference. Technical Field

[0003] The present disclosure relates to the field of medical devices, and in particular to an endoscope sheath protection structure. Background Art

[0004] An endoscope is a device that uses a probe and optical lens to examine and treat internal human tissue. Its optical imaging principle is that light enters the body from a light source behind it, is reflected by the inner wall of the endoscope head, and is ultimately guided by optical fibers to the observation device. The endoscope's optical lens focuses the light, forming a magnified image for the doctor to observe.

[0005] The related technology makes it difficult to maintain the overall stability of the sheath, which leads to accidental bumps or jitters during the operation of the endoscope, and then the optical axis between the rod lens group and the objective lens group is easily offset, thereby affecting the clarity of the image transmission of the rod lens group.

[0006] Summary of the Invention

[0007] Based on this, it is necessary to provide an endoscope sheath protection structure that can reduce jitter and ensure image transmission clarity in response to the above technical problems.

[0008] An endoscope sheath protection structure includes an incident light module, an objective lens module, an imaging module and a sheath coaxial module; wherein the incident light module is used to provide an incident light source, which is incident on the surface of an observed object through the objective lens module, and then, after being reflected by the surface of the observed object, it is transmitted backward through the objective lens module to the imaging module for imaging processing; the sheath coaxial module includes a base, an inner sheath fixedly connected to the base, and an outer sheath sleeved on the outside of the inner sheath and fixedly connected to the base, the objective lens module is fixedly arranged at the front end of the inner sheath, and the outer sheath includes a protective lens fixedly arranged at the front end of the outer sheath.

[0009] In the embodiment of the present disclosure, the inner mirror sheath includes a first mirror sheath tube body arranged horizontally, and the objective lens module is arranged at the front end of the first mirror sheath tube body.

[0010] In the embodiment of the present disclosure, the external mirror sheath includes a second mirror sheath body arranged parallel to the first mirror sheath body and a mirror sheath connecting portion integrally formed at the rear end of the second mirror sheath body, and the second mirror sheath body is fixedly connected to the base through the mirror sheath connecting portion.

[0011] In the disclosed embodiment, the protective lens is disposed at the front end of the second lens sheath tube and is located at the front end of the objective lens module.

[0012] In the embodiment of the present disclosure, the protective lens includes a rear end cutoff surface and a front end cutoff surface perpendicular to the optical axis of the objective lens module.

[0013] In the embodiment of the present disclosure, the protective lens also includes a transition surface extending obliquely backward from the edge of the front end cutoff surface. The transition surface extends obliquely backward to the inner wall of the external lens sheath and continues to extend horizontally backward to form a fitting surface. The fitting surface extends backward and cuts off to form a rear end cutoff surface.

[0014] In the embodiment of the present disclosure, the front end cutoff surface is circular, and its diameter is not less than the imaging diameter of the objective lens system.

[0015] In the embodiment of the present disclosure, the boundary formed by the transition surface and the fitting surface does not protrude beyond the front end of the outer mirror sheath.

[0016] In the embodiment of the present disclosure, the frontmost end of the outer mirror sheath does not protrude beyond the front end cutoff surface.

[0017] In the embodiment of the present disclosure, a closed space is formed between the inner mirror sheath and the outer mirror sheath.

[0018] In the embodiment of the present disclosure, the distance between the front end cut-off surface and the rear end cut-off surface does not exceed the working distance of the objective lens module and is not less than 1.5 mm.

[0019] In the embodiment of the present disclosure, the material of the protective lens is any one or more of glass, quartz, plastic film, glass filled with water, quartz, and plastic film.

[0020] In the disclosed embodiment, the distance between the rear end cut-off surface and the front end of the objective lens module is 0.1 mm ± 0.05 mm.

[0021] The above-mentioned endoscope sheath protection structure includes an incident light module, an objective lens module, an imaging module and a sheath coaxial module; wherein the incident light module is used to provide an incident light source, which is incident on the surface of the observed object through the objective lens module, and then, after being reflected by the surface of the observed object, it is transmitted back through the objective lens module to the imaging module for imaging processing; the sheath coaxial module includes a base, an internal sheath fixedly connected to the base, and an external sheath sleeved on the outside of the internal sheath and fixedly connected to the base, the objective lens module is fixedly arranged at the front end of the internal sheath, and the external sheath includes a protective lens fixedly arranged at the front end of the external sheath. The endoscope sheath protection structure is used to support the living organism and fix the modules in the endoscope system, and the incident light module guides the incident light to illuminate the object surface of the objective lens module. The objective lens module is used to generate fluorescence on its object surface when excited by the excitation light, and then form an image. This can improve the stability when using the endoscope system, is conducive to generating clearer and more accurate images, and is convenient for medical personnel to observe the living organism, thereby improving the accuracy and efficiency of medical examinations. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the traditional technology, the following is a brief introduction to the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the disclosed drawings without paying any creative work.

[0023] FIG1 is a cross-sectional schematic diagram of a protective lens in an endoscope sheath protection structure according to one embodiment;

[0024] FIG2 is a cross-sectional schematic diagram of a sheath coaxial module in an endoscope sheath protection structure according to one embodiment;

[0025] FIG3 is a cross-sectional schematic diagram of an incident light module in an endoscope sheath protection structure according to an embodiment;

[0026] FIG4 is a cross-sectional schematic diagram of a fluorescent module in an endoscope sheath protection structure according to one embodiment;

[0027] FIG5 is a schematic structural diagram of a self-compacting structure used in a dichroic mirror in one embodiment;

[0028] FIG6 is a cross-sectional schematic diagram of an objective lens module in an endoscope sheath protection structure according to one embodiment;

[0029] FIG7 a is a cross-sectional schematic diagram of the front end of the relay lens module in the endoscope sheath protection structure according to one embodiment;

[0030] FIG7 b is a cross-sectional schematic diagram of the rear end of the relay mirror module in the endoscope sheath protection structure according to one embodiment;

[0031] FIG8 is a cross-sectional schematic diagram of a rear end magnifying glass module in an endoscope sheath protection structure according to one embodiment;

[0032] FIG9 a is a front view of an endoscope sheath protection structure according to one embodiment;

[0033] FIG9 b is a right side view of an endoscope sheath protection structure according to one embodiment;

[0034] FIG9c is a top view of an endoscope sheath protection structure according to one embodiment;

[0035] FIG10 is a schematic cross-sectional view of an endoscope sheath protection structure in one embodiment. DETAILED DESCRIPTION

[0036] An endoscope is a device that uses a probe and optical lens to examine and treat internal human tissue. Its operating principle is based on optical imaging and probe technology. By introducing a light source and lens into a body cavity or tissue, the microscopic structure or pathological tissue within the body can be observed. The optical imaging principle of an endoscope is that light enters the body from a light source behind the body, is reflected by the inner wall of the endoscope head, and is ultimately guided to the observation device via optical fiber. The endoscope's optical lens focuses the light, forming a magnified image for the doctor to observe.

[0037] The realization of optical imaging in an endoscope mainly relies on the optical system set up inside it. With one end of the biological tissue as the front end, the optical system consists of an objective lens, a relay lens group, and an eyepiece arranged in sequence from the front end to the back end. The objective lens is used to collect information about the biological tissue and form an image based on this information. The relay lens group is used to transmit the image, and the eyepiece is used to magnify the image for observation by the clinician. The basis of optical imaging is the biological tissue information collected by the objective lens, so the collection of biological tissue information is an indispensable and important part.

[0038] Maintaining the overall stability of the mirror sheath is difficult in related technologies. This can lead to accidental bumps or jitters during operation, easily shifting the optical axis between the rod lens assembly and the objective lens assembly, thus affecting the clarity of the image transmitted by the rod lens assembly. Therefore, it is necessary to design a comprehensive imaging system that can reduce the impact of jitter on the image.

[0039] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0040] In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present disclosure.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying an order or relative importance, or implicitly indicating the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. Throughout the present disclosure, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0042] In this disclosure, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections, electrical connections, or communication connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components, unless otherwise expressly limited. Those skilled in the art will understand the specific meanings of the above terms in this disclosure based on specific circumstances.

[0043] In the present disclosure, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0044] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0045] In one embodiment, an endoscope sheath protection structure is provided, and the endoscope system includes an incident light module, an objective lens module, an imaging module and a sheath coaxial module; wherein the incident light module is used to provide an incident light source, and the incident light source is incident on the surface of the observed object through the objective lens module, and then after being reflected by the surface of the observed object, it is transmitted backward through the objective lens module to the imaging module for imaging processing; the sheath coaxial module includes a base, an inner sheath fixedly connected to the base, and an outer sheath mounted on the outside of the inner sheath and fixedly connected to the base, the objective lens module is fixedly arranged at the front end of the inner sheath, and the outer sheath includes a protective lens fixedly arranged at the front end of the outer sheath.

[0046] Specifically, as shown in FIG1 , a protective lens 102 is provided between the front end of the external sheath and the object being observed to prevent the endoscope from shaking during use, wherein the end of the sheath in the sheath coaxial module extends beyond the protective lens and fits against the surface of the biological organism being observed.

[0047] Exemplarily, the imaging module in the endoscope sheath protection structure also includes a relay lens module, a fluorescence module, and a rear-end magnifying lens module; wherein the incident light module is used to provide an incident light source and guide the incident light into the fluorescence module to obtain excitation light; the fluorescence module is used to reflect the excitation light to the relay lens module and the objective lens module to illuminate the object surface of the objective lens module and the surface of the observed object; the objective lens module is used to be excited by the excitation light on its object surface to produce fluorescence, and after the fluorescence is reflected from the surface of the observed object, it passes through the objective lens module and the relay lens module to the fluorescence module and the rear-end magnifying lens module, that is, it propagates backward through the objective lens module to the imaging module for imaging processing.

[0048] Furthermore, the sheath coaxial module is used to fix each module in the endoscope system.

[0049] Specifically, as shown in Figure 2, the mirror sheath coaxial module includes a mirror sheath 202 and a coaxial retaining groove module (not shown). The coaxial retaining groove system at the front end of the mirror sheath effectively secures each lens in place, while also ensuring that the distance between the rod lens assembly and the objective lens assembly is stable, preventing displacement and keeping the entire assembly aligned on the same circular axis.

[0050] Specifically, a protective outer sheath is placed over the inner sheath. This removable outer sheath ensures the stability of the sheath. This removable outer sheath allows the endoscope system to be installed or removed based on the needs of different scenarios, improving its flexibility.

[0051] Specifically, as shown in Figure 3, the incident light module includes an incident optical fiber 302 and an illumination lens 304. Light emitted from the incident optical fiber 302 enters the excitation filter in the fluorescence module through the illumination lens 304. The incident light is emitted from the incident optical fiber, collected by the illumination lens, and then enters the fluorescence module. The incident light is imaged from the exit end face of the incident optical fiber through the combined optical system of the illumination lens and part of the relay lens module to the system aperture of the entire microendoscope. In other words, there is an object-image relationship between the exit end face of the incident optical fiber and the system aperture of the entire microendoscope, thereby facilitating the implementation of Köhler illumination. Köhler illumination can provide uniform and sufficiently bright illumination of the living biological tissue to be examined without generating dazzling glare.

[0052] Specifically, as shown in Figure 4, the fluorescence module consists of an excitation filter 402, a dichroic mirror 404, and a fluorescence filter 406, wherein the fluorescence filter can be replaced by an emission filter. Incident light exits the incident optical fiber in the incident light module and enters the fluorescence module in the endoscope system. Excitation light is obtained by the excitation filter 402 in the fluorescence module. The excitation light is reflected by the dichroic mirror 404 and enters the relay lens module. From the relay lens module, it enters the objective lens module, uniformly illuminating the object surface. The excitation light excites the fluorescence of living tissue. The fluorescence information of the living tissue is collected by the objective lens and imaged onto its image plane. It is then transmitted over a long distance by the relay lens module, passes through the dichroic mirror 404, and is filtered by the fluorescence filter 406 before being transmitted to the rear-end magnifying lens module.

[0053] Furthermore, as shown in Figure 5, the self-compacting structure includes a dichroic mirror 404, a metal washer 502, a fixed connector 504, a left upper half triangular fixing member 506, and a right lower half triangular fixing member 508. Two semi-triangular pyramidal fixing members, i.e., the left upper half triangular fixing member 506 and the right lower half triangular fixing member 508, clamp the dichroic mirror 404 and the metal washer 502 in the middle to form a fixed structural assembly of the middle dichroic mirror 404, which is accommodated within the middle receiving chamber. The left side of the upper left half triangular fixing member 506 abuts against the left side of the inner wall of the receiving chamber, and the right side is compressed and accommodated within the receiving chamber by the fixed connector 504. The fixed connector 504 can be fixedly connected to the receiving chamber by fixing methods such as threads or rivets. Optionally, the dichroic mirror 404 has an inclination angle of 45°. Since the dichroic mirror in the fluorescence module is installed in the endoscope system using a self-compression structure, it can ensure that the dichroic mirror will not have unexpected failures such as position deviation during use, thereby affecting the image quality.

[0054] Specifically, the fluorescence module includes an excitation filter, a dichroic mirror and a fluorescence filter. The light path of the endoscope system is that the incident light enters the fluorescence module through the incident light module, the incident light obtains excitation light through the excitation filter, the excitation light is reflected by the dichroic mirror to the relay lens module and the objective lens module and irradiated to the object surface of the objective lens module, and the object surface of the objective lens module is excited by the excitation light to produce fluorescence. The fluorescence passes through the objective lens module and the relay lens module, passes through the dichroic mirror and is filtered by the fluorescence filter, and enters the rear-end magnifying lens module, so that the incident and output light propagate in the same tube cavity, and at the same time, the filtering of specific fluorescence bands is achieved.

[0055] Specifically, to ensure that the image of the objective lens module can be transmitted over long distances, the objective lens module uses an image-space telecentric microscope objective lens system with a certain magnification. From a technical perspective, the higher the telecentricity of the image-space telecentric microscope objective lens system, the more conducive it is to imaging.

[0056] Specifically, the objective lens module includes a small objective lens. Fluorescence is imaged once through the small objective lens, then imaged a target number of times through the relay lens module before entering the rear-end magnifying lens module. Furthermore, as shown in Figure 6, the objective lens module includes a small objective lens. Excitation light emitted through the relay lens module passes through the objective lens module to evenly illuminate the object surface. At this point, the light is not necessarily parallel. This excitation stimulates fluorescence in living tissue. The fluorescence information of the living tissue is collected by the objective lens module and imaged onto its image surface. It is then transmitted remotely by the relay lens module to the rear-end magnifying lens module.

[0057] Specifically, the relay lens module includes a relay lens, which includes a rod lens assembly. Each rod lens assembly includes two rod lens groups, and the two rod lens groups form a bi-telecentric imaging system with a target magnification. As shown in Figures 7a and 7b, Figure 7a shows the front end of the relay lens module, and Figure 7b shows the back end of the relay lens module. Rod lens 702, i.e., a triplet, and the two rod lens groups form a bi-telecentric -1x imaging system, i.e., a magnification of 1. Multiple bi-telecentric imaging systems constitute a relay lens, i.e., a relay lens composed of an even number of rod lens groups. The optical paths between the rod lenses forming the bi-telecentric imaging system are quasi-parallel, i.e., not necessarily absolutely parallel. Multiple rod-shaped mirrors form a relay lens, with two rod-shaped mirrors forming a dual-telecentric -1x imaging system. The overall magnification of the relay lens is 1x or -1x. Because rod-shaped mirrors are relatively small and lightweight, they are easy to hold and manipulate, allowing for greater flexibility. They also provide a wider field of view and allow for observation in confined or hard-to-reach spaces. Using multiple rod-shaped mirrors to form a relay lens enables long-distance image transmission, allowing for observation from a distance, reducing the risk of close-up observation and preventing interference with the living organism being measured.

[0058] Specifically, a set of bi-telecentric imaging systems is selected within the relay mirrors, and a fluorescence module is placed within the parallel optical path of this selected set of bi-telecentric imaging systems. Because the placement of the fluorescence module has a negligible effect on the original relay mirror imaging optical path, placing the fluorescence module between the rod-shaped mirrors that make up the target bi-telecentric imaging system allows it to generate excitation light and filter fluorescence without affecting the original optical path, minimizing the impact on image quality.

[0059] Specifically, as shown in FIG8 , the rear-end magnifying glass module includes a combination 802 of a magnifying glass and a rod lens. The object plane of the magnifying glass coincides with the image plane of the relay lens, thereby magnifying the generated image and obtaining a clearer image, thereby facilitating medical examinations.

[0060] Specifically, the imaging device includes a CMOS (Complementary Metal Oxide Semiconductor) camera. The object size of the magnifying glass corresponds to the image size of the imaging device; another function of the magnifying glass is to modulate the angle of the principal ray emitted from the relay lens to match the principal ray angle of the CMOS, thereby increasing the fluorescence collection energy. By setting up the imaging device for fluorescence imaging, it is convenient to obtain a clearer and more accurate inspection image, wherein the imaging device includes a complementary metal oxide semiconductor camera. Using a CMOS camera for imaging has many advantages, not only in terms of production cost, but also in terms of shorter manufacturing cycle and better scalability. At the same time, CMOS can achieve better low-light and high-light control, has higher superiority and higher stability on small high-resolution devices, and is suitable for endoscope systems. At the same time, the magnifying glass has a certain magnification, so that the object size corresponds to the image size of the CMOS, and can maximize the use of pixels.

[0061] Specifically, the endoscope system also includes an image processing module for processing the images captured by the camera and outputting the processed image data. Furthermore, the fluorescence entering the magnifying lens is directly imaged on the CMOS camera, which then passes through the image processing module to output a magnified and clear image, improving image quality and, in turn, the accuracy of medical examinations.

[0062] In this embodiment, the endoscope sheath protection structure includes an incident light module, an objective lens module, an imaging module and a sheath coaxial module; wherein, the incident light module is used to provide an incident light source, and the incident light source is incident on the surface of the observed object through the objective lens module, and then after being reflected by the surface of the observed object, it is transmitted backward through the objective lens module to the imaging module for imaging processing, thereby realizing medical examination of the living organism to be tested, avoiding jitter, and thus obtaining clear inspection images efficiently and accurately; the sheath coaxial module includes a base, an internal sheath fixedly connected to the base, and an external sheath that is mounted on the outside of the internal sheath and fixedly connected to the base, the objective lens module is fixedly arranged at the front end of the internal sheath, and the external sheath includes a protective lens fixedly arranged at the front end of the external sheath, and the sheath coaxial module is used to effectively fix the various lenses in the endoscope system to ensure the stability of the endoscope system and avoid problems such as falling off and disintegration during use.

[0063] In the embodiment of the present disclosure, the inner mirror sheath includes a first mirror sheath tube body arranged horizontally, and the objective lens module is arranged at the front end of the first mirror sheath tube body.

[0064] In this embodiment, the first lens sheath tube is used to fix the objective lens module.

[0065] In the embodiment of the present disclosure, the external mirror sheath includes a second mirror sheath body arranged parallel to the first mirror sheath body and a mirror sheath connecting portion integrally formed at the rear end of the second mirror sheath body, and the second mirror sheath body is fixedly connected to the base through the mirror sheath connecting portion.

[0066] Specifically, the fixed connection methods include threaded connection, snap connection, plug connection, welding connection, adhesive connection, etc.

[0067] In this embodiment, the second mirror sheath tube body is fixedly connected to the base via the mirror sheath connecting portion, which is conducive to fixing the protective lens arranged at the front end of the external mirror sheath.

[0068] In the disclosed embodiment, the protective lens is disposed at the front end of the second lens sheath tube and is located at the front end of the objective lens module.

[0069] In this embodiment, protective lenses are designed at the front end of the second sheath tube and the front end of the objective lens module. The width of the protective lenses is designed to ensure that incident light, after exiting the objective lens module, converges on the surface of the observed object. Propping the protective lenses against the surface of the observed living organism effectively prevents the negative effects of vibration. Furthermore, when the end of the sheath extends beyond the protective lenses and abuts against the surface of the living organism, the perimeter of the sheath rests against the observation area, further preventing the negative effects of vibration.

[0070] In the embodiment of the present disclosure, the protective lens includes a rear end cutoff surface and a front end cutoff surface perpendicular to the optical axis of the objective lens module.

[0071] In this embodiment, the front end cut-off surface and the rear end cut-off surface jointly determine the thickness of the protective lens, and the thickness of the protective lens also has a corresponding impact on the imaging quality of the endoscope.

[0072] In the embodiment of the present disclosure, the protective lens also includes a transition surface extending obliquely backward from the edge of the front end cut-off surface. The transition surface extends obliquely backward to the inner wall of the external lens sheath and continues to extend horizontally backward to form a fitting surface. The fitting surface extends backward and cuts off to form a rear end cut-off surface.

[0073] In this embodiment, the protective lens extends to the inner wall of the external mirror sheath through the transition surface to form a fitting surface, and the fitting surface extends backward to form a rear end cutoff surface, thereby ensuring that the protective lens is more firmly attached to the external mirror sheath.

[0074] In the embodiment of the present disclosure, the front end cutoff surface is circular, and its diameter is not less than the imaging diameter of the objective lens system.

[0075] In this embodiment, defining the shape and diameter of the front end cutoff surface is a prerequisite for ensuring that the endoscope can form an image.

[0076] In the embodiment of the present disclosure, the boundary formed by the transition surface and the fitting surface does not protrude beyond the front end of the outer mirror sheath.

[0077] In this embodiment, since the protective lens is arranged at the front end of the external mirror sheath, and the transition surface of the protective lens extends obliquely backward to the inner wall of the external mirror sheath and continues to extend horizontally backward to form a fitting surface, the boundary formed by the transition surface and the fitting surface does not protrude from the front end of the external mirror sheath.

[0078] In the embodiment of the present disclosure, the frontmost end of the outer mirror sheath does not protrude beyond the front end cutoff surface.

[0079] In this embodiment, since non-imaging light can enter the protective lens from the sides of the protective lens's outer fitting surface, thereby affecting endoscope imaging, the protective lens's side fitting surfaces must be completely retracted, and the protective lens must be sealed and bonded to the inner wall of the outer sheath using glue or other means to ensure the stability of the protective lens. If the front end of the outer sheath protrudes beyond the front cutoff surface, it will affect endoscopic imaging and pose risks to the procedure. During endoscope imaging, the front cutoff surface of the protective lens contacts the surface of living tissue and needs to slide continuously over it. If the front end of the outer sheath protrudes beyond the front cutoff surface, the outer sheath's outer periphery will exert additional pressure on the living tissue surface, further damaging it. This not only poses a series of risks but also prevents continuous sliding of the endoscope. In this embodiment, the front end surface abuts the living tissue surface to reduce the body's inherent biological vibrations. The protruding portion of the outer sheath also helps stabilize the observation area during imaging, further ensuring imaging stability and preventing vibration.

[0080] In the embodiment of the present disclosure, a closed space is formed between the inner mirror sheath and the outer mirror sheath.

[0081] In this embodiment, a closed space is formed between the inner sheath and the outer sheath. Firstly, the safety of the inner sheath can be ensured. Since the disinfection requirements for endoscopes are very strict in clinical practice, once the inner sheath and the outer sheath are not closed, the inner sheath and the lens will be contaminated. At the same time, the outer sheath is replaceable, and its disposable replacement feature can reduce surgical costs and ensure safety.

[0082] In the embodiment of the present disclosure, the distance between the front end cut-off surface and the rear end cut-off surface does not exceed the working distance of the objective lens module and is not less than 1.5 mm.

[0083] Specifically, the distance between the front end cutoff surface and the rear end cutoff surface, that is, the thickness of the protective lens, depends on the working distance of the small objective lens in the objective lens module. The thickest cannot exceed the working distance of the small objective lens, and the thinnest cannot be less than 1.5 mm, that is, 1.5 mm ≤ protective lens thickness ≤ working distance of the small objective lens in the objective lens module.

[0084] In this embodiment, to enable the installation of an anti-shake sheath structure on the objective lens module, the objective lens module is first configured as an objective lens system with negative spherical aberration. This spherical aberration is compensated for by a dielectric lens serving as the anti-shake structure. Determining the distance between the front and rear cutoff surfaces based on the working distance of the small objective lens achieves precise imaging while avoiding the risk of cracking due to excessive thinness of the protective lens. In the disclosed embodiment, the protective lens is made of any one or more of glass, quartz, plastic film, water-filled glass, quartz, or plastic film.

[0085] Specifically, glass is selected as the material for protecting the lens, and other light-transmitting uniform medium materials may also be used as a substitute, namely, quartz, plastic film, glass filled with water, quartz, and plastic film.

[0086] In this embodiment, by selecting any one or more of glass, quartz, plastic film, glass filled with water, quartz, and plastic film as the material of the protective lens, the material of the protective lens is expanded, which can reduce the impact of the protective lens on the fluorescent image, achieve clearer imaging, and reduce the cost of the protective lens.

[0087] In the disclosed embodiment, the distance between the rear end cut-off surface and the front end of the objective lens module is 0.1 mm ± 0.05 mm.

[0088] In this embodiment, considering the process expansion, the rear end cutoff surface and the front end of the objective lens module cannot be completely fitted together, and a certain gap will be maintained. Therefore, the distance between the rear end cutoff surface and the front end of the objective lens module is further explained.

[0089] In an embodiment of the present disclosure, an endoscope sheath protection structure is provided, the endoscope system includes an incident light module, an objective lens module, a relay lens module, a fluorescence module, a rear-end magnifying lens module and a sheath coaxial module; the incident light module guides the incident light into the fluorescence module to obtain excitation light, the incident light module includes an incident optical fiber and an illumination lens, and the incident light enters the fluorescence module through the incident optical fiber and the illumination lens; the fluorescence module is used to reflect the excitation light to the relay lens module and the objective lens module to illuminate the object surface of the objective lens module, the fluorescence module includes an excitation filter, a dichroic mirror and a fluorescence filter, and the dichroic mirror adopts a self-pressing structure; the objective lens module is used to be excited by the excitation light on its object surface to generate fluorescence, the objective lens module adopts an image-space telecentric microscope objective lens system, and the objective lens module includes a small object lens. The fluorescence is imaged once by the small objective lens and then imaged by the relay lens module according to the target number of times; the relay lens module includes a relay lens, and the relay lens includes a rod lens combination, wherein each rod lens combination includes two rod lenses, and the two rod lenses form a double telecentric imaging system of the target magnification, and the target double telecentric imaging system is selected, and the fluorescence module is located between the rod lenses that form the target double telecentric imaging system; the fluorescence module is also used to filter the fluorescence, and the filtered fluorescence enters the rear-end magnifying lens module; the rear-end magnifying lens module includes a magnifying lens, and the object surface of the magnifying lens coincides with the image surface of the relay lens. The rear-end magnifying lens module also includes a camera device, and the fluorescence image is on the camera device; the sheath coaxial module includes a base, an internal sheath fixedly connected to the base, and a sheath sleeved on the internal sheath The outer mirror sheath is fixedly connected to the base on the outside, and the objective lens module is fixedly arranged at the front end of the inner mirror sheath, and the outer mirror sheath includes a protective lens fixedly arranged at the front end of the outer mirror sheath; the inner mirror sheath includes a first mirror sheath tube body arranged horizontally, and the objective lens module is arranged at the front end of the first mirror sheath tube body; the outer mirror sheath includes a second mirror sheath tube body arranged parallel to the first mirror sheath tube body and a mirror sheath connecting part integrally formed at the rear end of the second mirror sheath tube body, and the second mirror sheath tube body is fixedly connected to the base through the mirror sheath connecting part; the protective lens is arranged at the front end of the second mirror sheath tube body and is located at the front end of the objective lens module, the protective lens includes a rear end cut-off surface and a front end cut-off surface perpendicular to the optical axis of the objective lens module, the protective lens also includes a transition surface extending obliquely backward from the edge of the front end cut-off surface, and the transition surface extends obliquely backward It extends to the inner wall of the external mirror sheath and continues to extend horizontally backward to form a fitting surface, which extends backward and cuts off to form a rear end cutoff surface; the front end cutoff surface is circular, and its diameter is not less than the imaging diameter of the objective lens system, and the boundary formed by the transition surface and the fitting surface does not protrude from the front end of the external mirror sheath; the front end of the external mirror sheath does not protrude from the front end cutoff surface, and a closed space is formed between the internal mirror sheath and the external mirror sheath. The distance between the front end cutoff surface and the rear end cutoff surface does not exceed the working distance of the objective lens module and is not less than 1.5mm; the material of the protective lens is any one or more of glass, quartz, plastic film, glass filled with water, quartz, and plastic film, and the distance between the rear end cutoff surface and the front end of the objective lens module is 0.1mm±0.05mm.The mirror sheath coaxial module also includes a detachable protective mirror sheath, which is used to ensure the stability of the mirror sheath as a whole. Furthermore, the endoscope system also includes an image processing module for processing the image formed on the camera device and outputting the processed image data.

[0090] In some embodiments, incident light enters the endoscope system through an incident optical fiber and enters the fluorescence module through an illumination lens. The incident light exits the illumination lens, is filtered by an excitation filter, then reflected by a dichroic mirror into a relay lens, and then into a small objective lens, uniformly illuminating the object surface. Excitation of the object surface by the excitation light produces fluorescence. The fluorescence information emitted by living tissue is imaged once by the small objective lens, then imaged multiple times by a relay lens and into a magnifying lens. A dichroic mirror and a fluorescence filter are located between the relay lens. Fluorescence passes through the dichroic mirror and is filtered by the fluorescence filter. The fluorescence entering the magnifying lens is directly imaged on a CMOS camera, and then, through an image processing system, a magnified, clear image is output.

[0091] In some embodiments, as shown in Figures 9a, 9b and 9c, three views of an endoscope sheath protection structure are provided, wherein Figure 9a is a front view of the endoscope sheath protection structure, Figure 9b is a right view of the endoscope sheath protection structure, and Figure 9c is a top view of the endoscope sheath protection structure.

[0092] Furthermore, as shown in Figure 10, the cross-sectional structure of an endoscope sheath protection structure includes a camera seat component 1002, a 4x magnifying glass and rod-shaped mirror combination 1004, a connecting tube 1006, a pin 1008, a pressure ring 1010, a mirror body 1012, a fluorescent module 1014, a cold light source coaxial illuminator 1016, a connecting ring 1018, a rod-shaped mirror component and a 3X0.45 small objective lens 1020, a mirror sheath 1022, a camera pressure cap 1024 and an illumination optical fiber 1026, wherein the illumination optical fiber is the incident optical fiber.

[0093] The above-mentioned embodiments and the technical features in the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0094] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. An endoscope sheath protection structure, comprising: An incident light module, an objective lens module, an imaging module and a sheath coaxial module; wherein the incident light module is used to provide an incident light source, the incident light source is incident on the surface of the observed object through the objective lens module, and then after being reflected by the surface of the observed object, it is transmitted backward through the objective lens module to the imaging module for imaging processing; the sheath coaxial module includes a base, an inner sheath fixedly connected to the base, and an outer sheath mounted on the outside of the inner sheath and fixedly connected to the base, the objective lens module is fixedly arranged at the front end of the inner sheath, and the outer sheath includes a protective lens fixedly arranged at the front end of the outer sheath.

2. The endoscope sheath protection structure according to claim 1, wherein: The inner mirror sheath comprises a first mirror sheath tube body arranged horizontally, and the objective lens module is arranged at the front end of the first mirror sheath tube body.

3. The endoscope sheath protection structure according to claim 2, wherein: The external mirror sheath includes a second mirror sheath body arranged parallel to the first mirror sheath body and a mirror sheath connecting portion integrally formed at the rear end of the second mirror sheath body, and the second mirror sheath body is fixedly connected to the base through the mirror sheath connecting portion.

4. The endoscope sheath protection structure according to claim 3, wherein: The protective lens is arranged at the front end of the second lens sheath tube body and is located at the front end of the objective lens module.

5. The endoscope sheath protection structure according to claim 4, wherein: The protective lens comprises a rear end cut-off surface and a front end cut-off surface which are perpendicular to the optical axis of the objective lens module.

6. The endoscope sheath protection structure according to claim 5, wherein: The protective lens also includes a transition surface extending obliquely backward from the edge of the front cutoff surface. The transition surface extends obliquely backward to the inner wall of the external lens sheath and continues to extend horizontally backward to form a fitting surface. The fitting surface extends backward and cuts off to form the rear end cutoff surface.

7. The endoscope sheath protection structure according to claim 6, wherein: The front end cut-off surface is circular, and its diameter is not less than the imaging diameter of the objective lens system.

8. The endoscope sheath protection structure according to claim 6, wherein: The boundary formed by the transition surface and the fitting surface does not protrude from the front end of the outer mirror sheath.

9. The endoscope sheath protection structure according to claim 6, wherein: The front end of the outer mirror sheath does not protrude beyond the front end cut-off surface.

10. The endoscope sheath protection structure according to claim 6, wherein: A closed space is formed between the inner mirror sheath and the outer mirror sheath.

11. The endoscope sheath protection structure according to claim 6, wherein: The distance between the front end cut-off surface and the rear end cut-off surface does not exceed the working distance of the objective lens module and is not less than 1.5 mm.

12. The endoscope sheath protection structure according to claim 6, wherein: The material of the protective lens is any one or more of glass, quartz, plastic film, glass filled with water, quartz, and plastic film.

13. The endoscope sheath protection structure according to claim 6, wherein: The distance between the rear end cut-off surface and the front end of the objective lens module is 0.1 mm ± 0.05 mm.

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