The tip and its illumination structure and endoscope

Abstract

This invention discloses an endoscope, its illumination structure, and an endoscope, belonging to the field of medical device technology, aiming to improve the uniformity of wide-angle illumination of the endoscope. The endoscope illumination structure extends the light-emitting part of the light-emitting element into the light-emitting cavity and distributes it uniformly along the circumference of the cavity, combined with a ring-shaped front light-emitting part, forming a continuous and soft surface light source distributed around the mounting hole. This significantly reduces the central light intensity, ensuring uniform light emission and effectively avoiding overexposure of reflected light in the center of the field of view. Simultaneously, by creating an annular notch formed by the radial penetration of the front end of the annular cavity into its outer wall, and providing a matching cylindrical peripheral light-emitting part, light can achieve large-angle lateral emission supplementary illumination in addition to the forward emission. The front light field and the lateral light field are effectively connected, forming a uniform illumination field under wide-angle and ultra-wide-angle fields of view, effectively eliminating edge vignetting and ensuring that doctors can observe clearly without blind spots.

Description

Technical Field

[0001] This invention belongs to the field of medical device technology, specifically relating to an endoscope, its illumination structure, and a tip. Background Technology

[0002] An endoscope is a medical device that enters the human body through natural orifices or surgical incisions to directly observe, diagnose, and treat internal organs or tissues. Existing endoscopes typically include an insertion component, a handle, and a display device. The insertion component includes an insertion tube and a tip, the tip having an illumination structure and an imaging module. The insertion component is connected to the front end of the handle for observation inside the body. The display device is connected to the rear end of the handle via a cable to display the internal environment observed by the imaging module.

[0003] To reduce patient discomfort and ensure smooth passage of the endoscope through narrow, winding body cavities, the radial dimensions of the endoscope tip are often designed to be extremely small. This directly results in severely limited space inside the tip for the installation of illumination structures and imaging modules, making it difficult to guarantee the illumination effect of the tip, which directly affects image quality and surgical safety.

[0004] To improve lighting effects within a limited space, several improvements have been proposed in the prior art. For example, Chinese utility model patent CN222752019U discloses a tip-end that incorporates a first lighting device, a second lighting device, and a camera device within its main body. This patented solution expands the combined lighting range by arranging the light guide axes of the two lighting devices asymmetrically around the camera's optical axis and creating a height difference between the lens surface of the camera device and the light-emitting surface of the lighting devices. This aims to cover the field of view of the camera device and avoid excessive differences in brightness between the acquired images.

[0005] Although the aforementioned tip expands the illumination area to some extent, in actual clinical practice, as endoscopes develop towards ultra-wide-angle observation and extreme miniaturization, their illumination structure still has the following problems:

[0006] 1) Poor uniformity of wide-angle illumination: Existing tip illumination structures consist of two or more point light sources. Under wide-angle or ultra-wide-angle fields of view, the illumination structure is limited by the light emission angle and light path distribution, which easily leads to excessively high illuminance in the center of the field of view and severely reduced illuminance in the peripheral areas. This extremely low illumination uniformity easily causes overexposure of tissue reflection in the center of the field of view and the formation of dark corners at the edges, seriously affecting the doctor's observation and accurate judgment of peripheral lesions.

[0007] 2) Severe light energy loss and easy generation of stray light at large angles: In traditional light guide or lens designs, in order to achieve large-angle illumination, large-angle light rays at the edges are prone to total internal reflection or disordered diffuse reflection inside optical components (such as lenses or light guides) or at interfaces. This not only leads to low effective light energy utilization, but the generated internal stray light can also interfere with the imaging module and reduce image contrast and clarity.

[0008] 3) Difficulty in balancing assembly space and optical performance: Traditional lighting optical designs are limited by the size of lens groups or light guides, making it difficult to simultaneously meet the requirements of efficient light guiding and ultra-wide-angle uniform illumination within the extremely small assembly space at the tip, thus restricting the miniaturization of endoscopes. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to provide a tip lighting structure with better wide-angle lighting uniformity.

[0010] The technical solution adopted by the present invention to solve its technical problem is: a tip lighting structure, including a light-emitting hole opened at the front of the tip body, a light-emitting element disposed at the light-emitting hole, and a light-emitting element disposed in the tip body and corresponding to the light-emitting element;

[0011] The light-emitting aperture includes an annular cavity extending axially inward from the front side of the tip body, and an annular notch formed by the front end of the annular cavity radially penetrating its outer wall.

[0012] The light-emitting component includes a ring-shaped front light-emitting part and a cylindrical peripheral light-emitting part;

[0013] The light-emitting part is located on the front of the tip body, and a mounting hole for mounting the image acquisition component is provided in the center of the part.

[0014] The peripheral light-emitting part is located at the annular notch, and its front end is connected to the outer periphery of the front light-emitting part; an annular light-emitting cavity is formed between the peripheral light-emitting part and the inner wall of the annular cavity.

[0015] The light-emitting element is disposed in an annular cavity, with its light-emitting portion extending into the cavity and evenly distributed along the circumference of the cavity.

[0016] Furthermore, the light-emitting component also includes a light guide portion extending from the peripheral light-emitting portion toward the rear end of the annular cavity.

[0017] Furthermore, the front light-emitting part and the peripheral light-emitting part are smoothly connected through the lens light-emitting part, and the lens light-emitting part is generally annular and has a longitudinal section that is arc-shaped.

[0018] Furthermore, taking the axis of symmetry of the light-emitting part of the lens as the z-axis, the vertex of the quadratic surface containing the light-emitting part of the lens as the origin, and the straight line passing through the origin and perpendicular to the z-axis as the x-axis, the surface shape of the quadratic surface of the light-emitting part of the lens satisfies the following equation:

[0019] In the above formula, The paraxial radius of curvature of the surface;

[0020] K is the constant of the quadratic surface, K=- ;

[0021] e is the eccentricity of the surface.

[0022] Furthermore, the light-emitting element is composed of multiple optical fibers; the emitting ends of the multiple optical fibers are arranged in a ring, and the distribution density gradually increases from the inside to the outside, so as to form the light-emitting part of the light-emitting element.

[0023] The present invention also provides a tip, including a tip body and having the tip illumination structure described above.

[0024] Furthermore, the tip body includes an outer sleeve and an inner sleeve;

[0025] The inner sleeve is disposed inside the outer sleeve, with its front end extending beyond the front end of the outer sleeve, so as to form a light-emitting hole with an annular cavity and an annular notch at the front part of the tip body.

[0026] Furthermore, the outer wall surface of the inner sleeve is provided with a mirror structure, which extends from the front end of the inner sleeve to a position corresponding to the rear end of the peripheral light-emitting part.

[0027] Furthermore, the tip also includes an imaging module, which includes a metal retainer disposed in a mounting hole and an image acquisition component disposed on the metal retainer.

[0028] The present invention also provides an endoscope including the aforementioned tip.

[0029] The beneficial effects of this invention are as follows: This tip illumination structure transforms the traditional concentrated point light source into a continuous and soft surface light source distributed around the mounting hole by extending the light-emitting part of the light-emitting element into the light-emitting cavity and distributing it evenly along the circumference of the light-emitting cavity, in conjunction with the annular front light-emitting part. This significantly reduces the central light intensity, allowing the light to be emitted evenly and effectively avoiding overexposure of the tissue in the center of the field of vision. At the same time, by opening an annular notch formed by the radial penetration of the front end of the annular cavity through its outer wall and setting a matching cylindrical peripheral light-emitting part, the limitation of the traditional structure that can only emit light axially forward is broken. This allows the light to be emitted in a large-angle lateral direction in the radial direction, under the constraint of the refraction angle at the junction of the peripheral light-emitting part and the front light-emitting part, in addition to the forward emission. The front light field and the lateral light field are effectively connected, forming a uniform illumination field under wide-angle and ultra-wide-angle fields of vision, which can effectively eliminate edge dark corners and ensure that doctors can observe clearly without blind spots. In addition, the mounting hole of the image acquisition component is opened in the center of the front light-emitting part, so that the light-emitting part can provide shadowless illumination that surrounds the image acquisition component coaxially. This can effectively eliminate the shadow blind spots caused by tissue folds and provide reliable optical protection for doctors to clearly observe and accurately judge edge lesions.

[0030] The technical effects brought about or directly generated by other technical features of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0031] Figure 1 This is a three-dimensional structural diagram of the tip lighting structure in this invention;

[0032] Figure 2 This is a cross-sectional view of the tip lighting structure in this invention;

[0033] Figure 3 This is a vertical three-dimensional isometric view of the tip body in this invention;

[0034] Figure 4 This is a schematic diagram of the front structure of the tip in this invention;

[0035] Figure 5 This is a schematic diagram of the implementation structure of the endoscope in this invention;

[0036] Figure 6 This is a simulation test diagram of the refraction angle constraint of the light-emitting element in Embodiment 1 of the present invention;

[0037] Figure 7 These are the true-color and curve graphs of the radiation intensity distribution obtained by tracing light in Embodiment 1 of the present invention;

[0038] The markings in the diagram are as follows: 100-head body, 110-outer sleeve, 120-inner sleeve, 121-mirror structure, 210-light emission hole, 211-annular cavity, 220-light emission element, 221-front light emission part, 222-mounting hole, 223-peripheral light emission part, 224-light emission cavity, 225-light guide part, 226-lens light emission part, 230-light emission element, 310-metal retaining element, 320-image acquisition component, 400-handle. Detailed Implementation

[0039] The present invention will be further described below with reference to the accompanying drawings and embodiments. The same reference numerals in the drawings denote components with the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0040] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or position and dimensional relationship based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of description and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0041] When the term "many" indicates a quantity, it usually refers to three or more; for example, "multiple" typically means three or more. The term "polymethyl methacrylate," abbreviated as PMMA, is a high molecular weight polymer with the chemical formula (C5O2H8)n. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] Combination Figure 1 , Figure 2 and Figure 3 As shown, the tip lighting structure includes a light-emitting hole 210 opened at the front of the tip body 100, a light-emitting element 220 disposed at the light-emitting hole 210, and a light-emitting element 230 disposed inside the tip body 100 and corresponding to the light-emitting element 220.

[0043] The light-emitting aperture 210 includes an annular cavity 211 extending axially inward from the front side of the tip body 100, and an annular notch formed by the front end of the annular cavity 211 radially penetrating its outer wall.

[0044] The light-emitting element 220 mainly functions as a light guide and lens. It is made of a light-transmitting material, preferably polymethyl methacrylate or glass. Polymethyl methacrylate has advantages such as high transparency, low price, and ease of molding or machining. The light-emitting element 220 includes a front light-emitting part 221 in the shape of a ring and a peripheral light-emitting part 223 in the shape of a cylinder.

[0045] The front light-emitting part 221 is provided on the front of the tip head body 100, and a mounting hole 222 for mounting the image acquisition component 320 is provided in the center of it.

[0046] The peripheral light-emitting part 223 is provided at the annular notch, and its front end is connected to the outer periphery of the front light-emitting part 221; an annular light-emitting cavity 224 is formed between the peripheral light-emitting part 223 and the inner wall of the annular cavity 211.

[0047] The light-emitting element 230 is disposed in the annular cavity 211, and its light-emitting part extends into the light-emitting cavity 224 and is evenly distributed along the circumference of the light-emitting cavity 224.

[0048] This tip illumination structure transforms a traditional concentrated point light source into a continuous and soft surface light source distributed around the mounting hole 222 by extending the light-emitting part of the light-emitting element 230 into the light-emitting cavity 224 and distributing it evenly along the circumference of the light-emitting cavity 224, in conjunction with the annular front light-emitting part 221. This significantly reduces the central light intensity, allowing the light to be emitted evenly and effectively avoiding overexposure of the tissue in the center of the field of vision. At the same time, by opening an annular notch formed by the radial penetration of the front end of the annular cavity 211 through its outer wall, and setting a matching cylindrical peripheral light-emitting part 223, the limitation of the traditional structure that can only emit light axially forward is broken. This allows the light to be emitted in a forward direction, and under the constraint of the refraction angle at the junction of the peripheral light-emitting part 223 and the front light-emitting part 221, it can achieve large-angle lateral emission of supplementary light in the radial direction. The front light field and the lateral light field are effectively connected, forming a uniform illumination field under wide-angle and ultra-wide-angle fields of vision, which can effectively eliminate edge dark corners and ensure that doctors can observe clearly without blind spots. In addition, the mounting hole 222 of the image acquisition component 320 is opened in the center of the front light-emitting part 221, so that the light-emitting part 220 can provide shadowless illumination that surrounds the image acquisition component 320 coaxially, which can effectively eliminate the shadow blind spots caused by tissue folds and provide reliable optical protection for doctors to clearly observe and accurately judge edge lesions.

[0049] For example Figure 2As shown, in some embodiments, the light-emitting element 220 further includes a light guide 225 extending from the peripheral light-emitting portion 223 toward the rear end of the annular cavity 211. Optically, the light guide 225, extending deep into the annular cavity 211, efficiently collects scattered light, reduces light scattering loss within the annular cavity 211, and performs deep premixing of the light through conduction, thereby further improving the softness and uniformity of the light emitted from the front light-emitting portion 221 and the peripheral light-emitting portion 223. Structurally, the rearwardly extending light guide 225 forms a stable insertion fit with the annular cavity 211, providing precise assembly positioning for the small light-emitting element 220 and preventing misalignment. It also tightly fills the opening of the annular cavity 211, providing reliable sealing protection for the internal light-emitting element 230, greatly enhancing the reliability of the tip illumination structure.

[0050] Combination Figure 1 and Figure 2 As shown, in some embodiments, the front light-emitting part 221 and the peripheral light-emitting part 223 are smoothly connected by a lens light-emitting part 226, which is generally annular and has an arc-shaped longitudinal section. The lens light-emitting part 226 can not only eliminate the geometric angle of the light-emitting interface and constrain the light according to a specific refraction angle so that the front light field and the lateral light field are smoothly blended and the light emission is uniform, but also avoid the instrument from scratching the human body during its movement in the human cavity, thus improving safety and facilitating postoperative cleaning and disinfection.

[0051] Based on the previous embodiment, with the axis of symmetry of the light-emitting part 226 of the lens as the z-axis, the vertex of the quadratic surface where the light-emitting part 226 of the lens is located as the origin, and the straight line passing through the origin and perpendicular to the z-axis as the x-axis, the surface shape of the quadratic surface of the light-emitting part 226 of the lens satisfies the following equation:

[0052] In the above formula, The paraxial radius of curvature of the surface;

[0053] K is the constant of the quadratic surface, K=- ;

[0054] e is the eccentricity of the surface.

[0055] By constructing the high-precision aspherical profile of the lens light-emitting section 226 using the above-mentioned quadratic surface equation, it is beneficial to eliminate optical spherical aberration and achieve parameterized high-precision free light distribution, so as to accurately control the light path, increase the average refraction angle of the edge area, ensure that the light covers a large angle area, and make the forward and lateral light fields seamlessly and smoothly blend, thereby achieving extremely uniform illumination without discontinuities or dead angles in wide-angle and ultra-wide-angle fields of view.

[0056] In some embodiments, the light-emitting element 230 is composed of multiple optical fibers; the emitting ends of the multiple optical fibers are arranged in a ring, and the distribution density gradually increases from the inside to the outside, forming the light-emitting part of the light-emitting element 230. The light-emitting element 230 composed of multiple optical fibers not only avoids heat accumulation and prevents burns to the human mucous membrane, but also greatly saves the internal space of the tip, promoting the miniaturization of the endoscope; in addition, the high-density ring-shaped fiber end face further enhances the coaxial "shadowless lamp" effect, the sparse arrangement inside reduces the amount of light projected to the center, reduces the light output in the central area, balances the brightness between the center and the edge, and eliminates the phenomenon of overexposure of the reflected tissue in the center of the field of view; while the dense arrangement outside enhances the amount of light in the periphery, which can effectively compensate for the sharp energy attenuation when the light is emitted at a large angle at the edge of the wide-angle view, eliminate the edge dark corner, significantly improve the uniformity of wide-angle illumination, and ensure that even small lesions can be visualized in high definition. Optical fibers with a diameter of 40 to 60 micrometers are usually selected to form the light-emitting element 230, and 50-micrometer optical fibers are preferred.

[0057] The present invention also provides a tip, including a tip body 100, and having the tip illumination structure described above. The outer diameter of the tip body 100 is typically less than or equal to 6 mm.

[0058] Combined Figure 2 and Figure 3 As shown, in some embodiments, the tip body 100 includes an outer sleeve 110 and an inner sleeve 120; the inner sleeve 120 is disposed inside the outer sleeve 110, and its front end extends beyond the front end of the outer sleeve 110 to form a light-emitting hole 210 with an annular cavity 211 and an annular notch at the front of the tip body 100. The tip-end body 100 adopts a nested structure design of an outer sleeve 110 and an inner sleeve 120, which not only utilizes the size difference between the two to naturally assemble the required annular cavity 211 and annular notch, greatly reducing the processing difficulty and cost of the tiny light-emitting hole 210, but also makes the tip-end body 100 modular, facilitating assembly and maintenance. In addition, the inner cavity of the inner sleeve 120 can be used to install the circuitry, circuit boards and other components of the imaging module, forming a physical isolation wall between the illumination structure and the imaging module, effectively preventing light leakage and interference. Furthermore, the annular notch formed by the recessed front end of the outer sleeve 110 provides a perfect installation position for the peripheral light-emitting part 223, ensuring that the light can be emitted laterally at a large angle. The outer sleeve 110 and the inner sleeve 120 are usually made of stainless steel, preferably 304 or 316 stainless steel.

[0059] The overall structure of this tip does not employ threaded connections or welding for fixing. Instead, it primarily utilizes the extrusion of materials with different hardnesses to create a lightweight and precise endoscopic illumination system, significantly reducing manufacturing difficulty and saving costs. Furthermore, it can be sealed with adhesive, providing both waterproofing and preventing bacterial growth, thus meeting the sterilization and disinfection regulations for medical endoscopes.

[0060] Combined Figure 2 and Figure 3 As shown, based on the previous embodiment, in order to recover deviated light rays, reduce light loss, and improve the light energy utilization rate of the tip, a mirror structure 121 is provided on the outer wall surface of the inner sleeve 120. The mirror structure 121 extends from the front end of the inner sleeve 120 to a position corresponding to the rear end of the peripheral light-emitting part 223. The mirror structure 121 can be provided in various ways, preferably by mirror polishing the outer surface of the inner sleeve 120.

[0061] Specifically, such as Figure 4 As shown, the tip also includes an imaging module, which includes a metal retainer 310 disposed within the mounting hole 222 and an image acquisition component 320 disposed on the metal retainer 310. The image acquisition component 320 can be of various types, preferably a CMOS image sensor.

[0062] The tip provided by this invention solves the core problems of illumination uniformity, light loss and structural limitations, forming a solution suitable for wide-angle, large-range and uniform illumination of endoscopes.

[0063] like Figure 5 As shown, the present invention also provides an endoscope including a handle 400 and the aforementioned tip.

[0064] Example 1

[0065] Combination Figures 1 to 3 As shown, the tip lighting structure includes a light-emitting hole 210 opened at the front of the tip body 100, a light-emitting element 220 disposed at the light-emitting hole 210, and a light-emitting element 230 disposed inside the tip body 100 and corresponding to the light-emitting element 220.

[0066] The light-emitting aperture 210 includes an annular cavity 211 extending axially inward from the front side of the tip body 100, and an annular notch formed by the front end of the annular cavity 211 radially penetrating its outer wall.

[0067] The light-emitting component 220 includes an annular front light-emitting portion 221 and a cylindrical peripheral light-emitting portion 223. The front light-emitting portion 221 is disposed on the front side of the tip body 100, and a mounting hole 222 for mounting the image acquisition component 320 is provided in its center. The peripheral light-emitting portion 223 is disposed at the annular notch, and its front end is connected to the outer periphery of the front light-emitting portion 221. An annular light-emitting cavity 224 is formed between the peripheral light-emitting portion 223 and the inner wall of the annular cavity 211. The front light-emitting portion 221 and the peripheral light-emitting portion 223 are smoothly connected by a lens light-emitting portion 226, which is annular in shape and has an arc-shaped longitudinal section. The light-emitting component 220 also includes a light guide portion 225 extending from the peripheral light-emitting portion 223 to the rear end of the annular cavity 211.

[0068] The light-emitting element 230 is disposed in the annular cavity 211, and its light-emitting part extends into the light-emitting cavity 224 and is evenly distributed along the circumference of the light-emitting cavity 224. The light-emitting element 230 is composed of multiple optical fibers. The emitting ends of the multiple optical fibers are distributed in a ring, and the distribution density gradually increases from the inside to the outside to form the light-emitting part of the light-emitting element 230.

[0069] In this embodiment, the light-emitting element 220 is made of polymethyl methacrylate material using an integral injection molding process; the longitudinal cross-sectional radius of the inner arc surface of the lens light-emitting part 226 is 0.30 mm, and the longitudinal cross-sectional radius of the outer arc surface of the lens light-emitting part 226 is 0.70 mm, with both tolerances being ±0.05 mm.

[0070] The ZEMAX optical design and simulation software suite from Ansys, USA, was used to perform refraction angle constraint simulation calculations on the light-emitting part 226 of the lens. Lens refraction angle constraint generally refers to the physical restrictions that the refraction angle must meet when light passes through a lens in an optical system. It is mainly determined by the law of refraction (Snell's law) and the lens geometry. The calculation formula is as follows:

[0071]

[0072] In the above formula, These are the refractive indices of the incident medium and the refracting medium, respectively.

[0073] Angle of incidence (the angle between the ray and the normal);

[0074] : Angle of refraction (to be determined).

[0075] Import the structural morphology and dimensions of optical component 220 into ZEMAX software; define the material types: air refractive index 1, glass refractive index 1.5, and optical-grade polymethyl methacrylate (PMMA) refractive index 1.49. Set the model to non-sequential ray tracing mode. The advantage of non-sequential ray tracing is that it allows light to propagate along arbitrary paths in the optical system. In this case, the ray tracing parameters are set to scatter, reflect, and refract onto any surface.

[0076] The simulation results of the refraction angle constraint are as follows: Figure 6 As shown. The results show that when the incident light beam is at an angle of 120 degrees, after refraction by the light-emitting part 226 of the lens, the angle of the emitted light beam is magnified to 170 degrees.

[0077] By tracking a large number of light rays, the ZEMAX software can accurately calculate the distribution of light rays in the system and energy loss, such as... Figure 7 As shown, this yields more realistic simulation results. Figure 7 The upper-middle side graph uses true color to represent the radiation intensity projected along the Z-axis. Figure 7 The lower part of the graph uses curves to represent the radiation intensity in the XY plane.

[0078] This embodiment uses a planar detector to accurately calculate the irradiance distribution under refraction angle constraints. Simulation results show that the irradiance on a plane 10 mm away from the detector, within a radius of 10 mm, is 0.0015 W / mm². Figure 7 (Represented by the lower middle side graphic), the irradiation intensity is uniformly distributed ( Figure 7 (See upper-middle graphic representation). Irradiance decays rapidly within a radius of 10 mm to 20 mm. Simulation results of irradiance intensity show that the tip illumination structure provided by this invention exhibits good uniformity and concentrated brightness within a 10 mm center area.

[0079] Example 2

[0080] like Figure 5 As shown, an endoscope includes a handle 400, an imaging module, and a tip. The tip has a tip body 100 and the tip illumination structure in Embodiment 1. The tip body 100 includes an outer sleeve 110 and an inner sleeve 120. The inner sleeve 120 is disposed inside the outer sleeve 110, and its front end extends beyond the front end of the outer sleeve 110 to form a light-emitting hole 210 with an annular cavity 211 and an annular notch at the front part of the tip body 100. A mirror structure 121 is provided on the outer wall surface of the inner sleeve 120, and the mirror structure 121 extends from the front end of the inner sleeve 120 to a position corresponding to the rear end of the peripheral light-emitting part 223. The imaging module includes a metal retainer 310 disposed in a mounting hole 222 and an image acquisition component 320 disposed on the metal retainer 310. The image acquisition component 320 is a CMOS image sensor.

[0081] The tip head body 100 is made of 316 stainless steel; the outer diameter of the inner sleeve 120 is 4.6 mm, and the outer diameter of the outer sleeve 110 is 6 mm; the light-emitting element 230 is composed of multiple optical fibers with a diameter of 50 micrometers; the outer diameter of the light-emitting part of the light-emitting element 230 is 4.6 mm and the inner diameter is 4 mm.

[0082] In this embodiment, an illuminance meter was used for detection at a distance of 10 mm from the target surface, and the illuminance of the central spot was 154 lux.

[0083] In the irradiation range detection of this embodiment, the distance from the detection surface was 10 mm, and the measured spot diameter was 20 mm.

[0084] This document presents a description of various embodiments of the invention for illustrative purposes only and is not intended to be exhaustive or limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein has been chosen to best explain the principles, practical applications, or technological advancements of the embodiments, or to enable others skilled in the art to understand the embodiments disclosed herein, compared to technologies found in the market.

[0085] It should be understood that, for clarity, certain features of the invention described in the context of a single embodiment may also be provided in combination in a single embodiment. Conversely, for brevity, various features of the invention described in the context of a single embodiment may also be provided individually or in any suitable sub-combination, or, where appropriate, in any other described embodiment of the invention. Unless the embodiment does not function without those features, certain features described in the context of various embodiments are not considered essential features of those embodiments.

Claims

1. A tip illumination structure, comprising a light-emitting hole (210) opened at the front of a tip body (100), a light-emitting element (220) disposed at the light-emitting hole (210), and a light-emitting element (230) disposed within the tip body (100) and corresponding to the light-emitting element (220); characterized in that: The light-emitting aperture (210) includes an annular cavity (211) extending axially inward from the front side of the tip body (100), and an annular notch formed by the front end of the annular cavity (211) radially penetrating its outer wall. The light-emitting element (220) includes a front light-emitting part (221) in the shape of an annular shape and a peripheral light-emitting part (223) in the shape of a cylinder. The front light-emitting part (221) is located on the front of the tip head body (100), and a mounting hole (222) for mounting the image acquisition component (320) is provided in its center. The peripheral light-emitting part (223) is located at the annular notch, and its front end is connected to the outer periphery of the front light-emitting part (221); an annular light-emitting cavity (224) is formed between the peripheral light-emitting part (223) and the inner wall of the annular cavity (211). The light-emitting element (230) is disposed in the annular cavity (211), and its light-emitting part extends into the light-emitting cavity (224) and is evenly distributed along the circumference of the light-emitting cavity (224).

2. The tip lighting structure according to claim 1, characterized in that: The light-emitting element (220) also includes a light guide (225) extending from the peripheral light-emitting part (223) to the rear end of the annular cavity (211).

3. The tip lighting structure according to claim 1, characterized in that: The front light-emitting part (221) and the peripheral light-emitting part (223) are smoothly connected through the lens light-emitting part (226), which is generally annular and has a circular cross-section.

4. The tip illumination structure according to claim 3, characterized in that: Using the axis of symmetry of the light-emitting part (226) of the lens as the z-axis, the vertex of the quadratic surface where the light-emitting part (226) of the lens is located as the origin, and the straight line passing through the origin and perpendicular to the z-axis as the x-axis, the surface shape of the quadratic surface of the light-emitting part (226) of the lens satisfies the following equation: In the above formula, The paraxial radius of curvature of the surface; K is the constant of the quadratic surface, K=- ; e is the eccentricity of the surface.

5. The tip lighting structure according to any one of claims 1 to 4, characterized in that: The light-emitting element (230) is composed of multiple optical fibers; the emitting ends of the multiple optical fibers are distributed in a ring, and the distribution density gradually increases from the inside to the outside, so as to form the light-emitting part of the light-emitting element (230).

6. A tip, comprising a tip body (100), characterized in that: It has a tip lighting structure as described in any one of claims 1 to 5.

7. The tip according to claim 6, characterized in that: The tip body (100) includes an outer sleeve (110) and an inner sleeve (120). The inner sleeve (120) is disposed inside the outer sleeve (110), with its front end extending beyond the front end of the outer sleeve (110) to form a light-emitting hole (210) with an annular cavity (211) and an annular notch at the front of the tip body (100).

8. The tip according to claim 7, characterized in that: The outer wall surface of the inner sleeve (120) is provided with a mirror structure (121), which extends from the front end of the inner sleeve (120) to a position corresponding to the rear end of the peripheral light-emitting part (223).

9. The tip according to any one of claims 6 to 8, characterized in that: It also includes an imaging module, which includes a metal retainer (310) disposed in a mounting hole (222) and an image acquisition component (320) disposed on the metal retainer (310).

10. An endoscope, characterized in that: Includes the tip as described in any one of claims 6 to 9.

Images