Insertion device for an endoscope system and endoscope system comprising same

Abstract

The application provides an insertion device for an endoscope and an endoscope system comprising the same, and belongs to the technical field of endoscopes. The insertion device comprises a first superlens and an optical fiber. The first superlens is arranged at one end of the optical fiber facing a to-be-measured object. The first superlens is a Huygens superlens, and the optical fiber is a bundled optical fiber. The insertion device and the endoscope system comprising the same provided by the application embodiment combine the first superlens and the optical fiber, omit the refractive lens, the prism and the optical detector in the traditional endoscope, reduce the diameter of the insertion device, reduce the rejection reaction of the patient's body to the endoscope, and slow down the pain caused by the endoscope.

Description

Technical Field

[0001] This application relates to the technical field of endoscopes, and more specifically, to an insertion device for an endoscope system and an endoscope system comprising the same. Background Technology

[0002] An endoscopic system includes an insertion device and a control device. The insertion device has a probe at one end and is connected to the control device at the other. During use, the probe end of the insertion device is inserted into a region invisible to the naked eye. The probe receives light emitted or reflected from the object being examined and displays an image on the control device. In some scenarios, the insertion device also includes a gas-liquid channel for delivering gases or drugs into the patient. In some scenarios, the insertion device also includes an actuator for clearing diseased tissue.

[0003] Existing endoscopic insertion devices include a probe comprising an objective lens, a prism for folding the optical path, an illumination element, and an optical detector. The objective lens is a refractive lens; light received by the objective lens is refracted by the prism and then illuminates the photosensitive surface of the optical detector, where it is converted into an electrical signal.

[0004] In existing technologies, refractive lenses, prisms, illumination elements, and optical detectors are all integrated into the probe, resulting in an increased probe size, especially an increased probe diameter. Therefore, when the insertion device of existing endoscopes is inserted into the patient's body, it causes strong rejection reactions (such as vomiting) and pain. Summary of the Invention

[0005] In view of this, to address the technical problem of large probe diameter in existing endoscope systems' insertion devices, embodiments of this application provide an insertion device for an endoscope system and an endoscope system including the same. This application's technical solution addresses the problem of overly simplistic solutions in existing technologies by providing a significantly different solution.

[0006] In a first aspect, embodiments of this application provide an insertion device for an endoscope system, characterized in that the insertion device includes a first superlens and an optical fiber;

[0007] The first superlens is disposed at the end of the optical fiber facing the object to be measured; and the first superlens is a Huygens superlens, and the optical fiber is a bundled optical fiber.

[0008] Optionally, the distance between the first superlens and the optical fiber is greater than zero.

[0009] Optionally, the distance between the first superlens and the optical fiber is zero.

[0010] Optionally, the insertion device further includes an aperture and a connector;

[0011] The aperture is positioned on the side of the first superlens away from the optical fiber, so that the aperture and the first superlens form an image-side telecentric system;

[0012] The connector is a cylindrical structure; one end of the cylindrical structure is connected to the optical fiber, and the other end of the cylindrical structure faces the object to be measured; the aperture is coaxially disposed with the first superlens in the inner cavity of the cylindrical structure.

[0013] Optionally, the distance between the aperture stop and the first superlens is less than or equal to one focal length of the first superlens.

[0014] Optionally, the outer diameter of the optical fiber is larger than the outer diameter of the connector.

[0015] Optionally, the insertion device further includes a limiting member;

[0016] One end of the limiting member is in contact with the surface of the optical fiber; the other end of the limiting member is in contact with the surface of the first superlens facing the optical fiber; the limiting member is configured to allow the operating wavelength to pass through.

[0017] Optionally, the insertion device further includes a second superlens;

[0018] The second superlens is disposed at the end of the optical fiber away from the first superlens.

[0019] Optionally, the light-receiving surface of the first superlens is at the same height as the end face of the optical fiber furthest from the second superlens.

[0020] Optionally, the light-emitting surface of the second superlens is at the same height as the end face of the optical fiber furthest from the first superlens.

[0021] Optionally, the optical fiber includes an image transmission optical fiber and an illumination optical fiber;

[0022] The image transmission fiber is used to transmit the light received by the first superlens;

[0023] The illumination optical fiber is distributed around the image transmission optical fiber to provide illumination.

[0024] Optionally, the optical fiber comprises at least 5,000 single-mode fibers; any one of the single-mode fibers can transmit light at a wavelength of 200-2500 nm.

[0025] Optionally, the length of the optical fiber is greater than or equal to 0.2m.

[0026] Optionally, the outer diameter of the optical fiber is less than or equal to 5 mm.

[0027] Optionally, the first superlens is a chromatic aberration correcting superlens.

[0028] Optionally, the second superlens is a chromatic aberration correcting superlens.

[0029] Optionally, the numerical aperture of the first superlens is less than or equal to 0.8.

[0030] Optionally, the half field of view of the first superlens is less than or equal to 60°.

[0031] Optionally, the back focal length of the first superlens is equal to the focal length of the first superlens.

[0032] Optionally, the insertion device further includes a gas-liquid channel and an actuator.

[0033] Secondly, embodiments of this application also provide an endoscope system, the endoscope system including a control device and an insertion device provided in any of the above embodiments;

[0034] The control device includes an optical detector;

[0035] The end of the optical fiber furthest from the first superlens is connected to the control device.

[0036] Optionally, the control device further includes a microscope objective and a tube lens;

[0037] The microscope objective and the tube lens are arranged sequentially between the optical fiber and the photosensitive surface of the optical detector along the direction of light incidence.

[0038] Optionally, the microscope objective and / or tube lens is a superlens.

[0039] The insertion device for an endoscope system and the endoscope system comprising the device provided in this application have at least the following beneficial effects:

[0040] The insertion device for an endoscope system provided in this application embodiment places a Huygens superlens at the end of an optical fiber facing the object to be measured. The Huygens superlens receives light signals and transmits them through the optical fiber. It does not include prisms or photosensitive devices, resulting in a simpler structure. Furthermore, to achieve the same focusing effect, the Huygens superlens has a smaller volume and diameter than a refractive lens, making this insertion device smaller in size and diameter.

[0041] The endoscopic system provided in this application embodiment has a first superlens and an optical detector respectively disposed in the insertion device and the control device. The structured light signal from the first superlens in the insertion device is transmitted to the optical detector in the control device via optical fiber. The separation of the first superlens and the optical detector simplifies the structure of the insertion device, reduces the diameter of the insertion device, and decreases the patient's rejection reaction and pain when using the endoscopic system. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of this application or the background art, the accompanying drawings used in the embodiments of this application or the background art will be described below.

[0043] Figure 1 This illustration shows an optional structural diagram of an insertion device for an endoscope system provided in an embodiment of this application;

[0044] Figure 2 This invention illustrates another optional structural schematic diagram of an insertion device for an endoscope system provided in an embodiment of this application;

[0045] Figure 3 This invention illustrates another optional structural schematic diagram of an insertion device for an endoscope system provided in an embodiment of this application;

[0046] Figure 4 This invention illustrates another optional structural schematic diagram of an insertion device for an endoscope system provided in an embodiment of this application;

[0047] Figure 5 This invention illustrates another optional structural schematic diagram of an insertion device for an endoscope system provided in an embodiment of this application;

[0048] Figure 6 This invention illustrates another optional structural schematic diagram of an insertion device for an endoscope system provided in an embodiment of this application;

[0049] Figure 7 This illustration shows an optional structural diagram of the endoscope system provided in an embodiment of this application;

[0050] Figure 8 This illustration shows another optional structural diagram of the endoscope system provided in the embodiments of this application;

[0051] Figure 9 This illustration shows another optional structural diagram of the endoscope system provided in the embodiments of this application;

[0052] Figure 10 This illustration shows another optional structural diagram of the endoscope system provided in the embodiments of this application;

[0053] Figure 11 This illustration shows an optional structural diagram of the superlens provided in an embodiment of this application;

[0054] Figure 12 This illustration shows an optional structural diagram of the nanostructure provided in an embodiment of this application;

[0055] Figure 13 This illustration shows another optional structural diagram of the nanostructure provided in the embodiments of this application;

[0056] Figure 14 A schematic diagram illustrating an optional arrangement of the nanostructures provided in an embodiment of this application is shown;

[0057] Figure 15 This illustration shows another optional arrangement of the nanostructures provided in the embodiments of this application;

[0058] Figure 16 This illustration shows another optional arrangement of the nanostructures provided in the embodiments of this application;

[0059] Figure 17 This paper illustrates an optional relationship between the feature size and phase of the nanostructure in the first superlens provided in an embodiment of this application.

[0060] Figure 18 An optional phase diagram of the first superlens provided in an embodiment of this application is shown;

[0061] Figure 19 An optional modulation transfer function of the endoscope system provided in an embodiment of this application is shown;

[0062] Figure 20 This illustrates yet another optional phase diagram of the first superlens provided in an embodiment of this application;

[0063] Figure 21 This illustrates yet another optional phase diagram of the second superlens provided in an embodiment of this application;

[0064] Figure 22 This illustrates another optional modulation transfer function for the endoscope system provided in the embodiments of this application.

[0065] The attached diagrams respectively represent:

[0066] 10-First superlens; 20-Fiber optic cable; 30-Aperture stop; 40-Connector; 50-Limiting component; 60-Second superlens; 70-Optical detector;

[0067] 201 - Image transmission fiber; 202 - Illumination fiber;

[0068] 101 - Base layer; 102 - Nanostructure layer; 1021 - Nanostructure; 1022 - Filler. Detailed Implementation

[0069] The present application will now be described more fully below with reference to the accompanying drawings, in which various embodiments are illustrated. However, the present application may be implemented in many different ways and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present application will be exhaustive and complete, and will fully convey the scope of the present application to those skilled in the art. The same reference numerals denote the same parts throughout the drawings. Furthermore, in the drawings, the thickness, proportions, and dimensions of parts are enlarged for clarity.

[0070] The terminology used herein is for descriptive purposes only and is not intended to be limiting. Unless the context clearly indicates otherwise, the terms “a,” “an,” “the,” and “at least one” as used herein are not intended to limit the quantity but are intended to include both singular and plural forms. For example, unless the context clearly indicates otherwise, “a component” has the same meaning as “at least one component.” “At least one” should not be construed as limited to the quantity “a.” “Or” means “and / or.” The term “and / or” includes any and all combinations of one or more of the associated listed items.

[0071] Unless otherwise specified, all terms used herein, including technical and scientific terms, shall have the same meaning as commonly understood by one of ordinary skill in the art. Terms defined in commonly used dictionaries shall be interpreted as having the same meaning as in the relevant technical context, and shall not be construed as having a formal meaning in an idealized or overly formal sense unless expressly defined in the specification.

[0072] The meaning of “includes” or “contains” specifies a nature, quantity, step, operation, component, part, or combination thereof, but does not exclude other natures, quantities, steps, operations, components, parts, or combinations thereof.

[0073] This document describes embodiments with reference to cross-sectional views as idealized implementations. Thus, variations in shape relative to the illustrations are anticipated as a result of, for example, manufacturing techniques and / or tolerances. Therefore, the embodiments described herein should not be construed as limited to the specific shapes of the regions shown herein, but should include deviations in shape due to, for example, manufacturing processes. For example, regions shown or described as flat may typically have rough and / or non-linear characteristics. Furthermore, acute angles shown may be rounded. Therefore, the regions shown in the figures are schematic in nature, and their shapes are not intended to show precise shapes of the regions and are not intended to limit the scope of the claims.

[0074] In the following description, exemplary embodiments according to this application will be described with reference to the accompanying drawings.

[0075] This application provides an insertion device for an endoscope system, such as... Figures 1 to 6 As shown, the insertion device includes a first superlens 10 and an optical fiber 20. The first superlens 10 is a Huygens superlens, and the optical fiber 20 is a bundled optical fiber. The first superlens 10 is positioned at the end of the optical fiber 20 facing the object to be measured. When the endoscope system is operating, the insertion device is at least partially inserted into a position invisible to the naked eye. At this time, the first superlens 10 faces the object to be measured, and the light emitted or reflected by the object is received by the first superlens 10 and then transmitted to the control device of the endoscope system via the optical fiber 20.

[0076] According to embodiments of this application, the optical fiber 20 is a bundled optical fiber, which includes at least 5000 single-mode optical fibers, each of which can transmit light with a wavelength of 200-2500 nm. Exemplarily, the length of the optical fiber 20 is greater than or equal to 0.2 m. In some alternative embodiments, the outer diameter of the optical fiber 20 is less than or equal to 5 mm.

[0077] It should be noted that a superlens is a specific application of metasurface technology, which modulates the amplitude, frequency, phase, and polarization of incident light through periodically arranged nanostructures on a substrate. A Huygens superlens is a superlens designed based on Huygens' principle. The distance between the first superlens 10 and the end face of the optical fiber 20 must be equal to the back focal length of the first superlens (micrometer level), requiring extremely high assembly precision. Any assembly errors will result in a decrease in the imaging quality of the endoscope system.

[0078] In some alternative embodiments, the distance between the first superlens 10 and the optical fiber 20 is greater than zero. Further, as... Figures 1 to 3 As shown, the insertion device of the endoscope system provided in this embodiment of the application further includes an aperture 30 and a connector 40. See also Figure 1 and Figure 3 An aperture stop 30 is positioned in the object space of the first superlens 10, specifically on the side of the first superlens 10 furthest from the optical fiber 20, so that the aperture stop 30 and the first superlens 10 form an image-side telecentric system. Light rays emitted or transmitted by the object under test pass through this telecentric system and are imaged on the end face of the optical fiber 20. Since the principal ray defining the image height in the image-side telecentric system is parallel to the optical axis, the magnification of the image of the object under test does not change with the distance between the image plane and the first superlens 10. Therefore, the spacing variation (assembly tolerance) between the first superlens 10 and the end face of the optical fiber 20 caused by assembly will not affect the imaging of the first superlens 10.

[0079] According to the embodiments of this application, such as Figure 1 or Figure 3As shown, the connector 40 is a cylindrical structure. One end of this cylindrical structure is connected to the optical fiber 20, and the other end faces the object to be measured. The aperture 30 and the first superlens 10 are sequentially arranged in the inner cavity of the cylindrical structure along the direction of light incidence. Optionally, the outer diameter of the optical fiber 20 is larger than the outer diameter of the connector 40. According to an embodiment of this application, as... Figure 2 As shown, the aperture stop distance of the insertion device provided in this embodiment, that is, the distance between the aperture stop 30 and the first superlens 10, is less than or equal to one focal length of the first superlens 10. Optionally, the back focal length (BFL, Back Focal Length), that is, the distance between the end face of the optical fiber 20 near the first superlens and the first superlens, is equal to the focal length (EFL, Effective Focal Length) of the first superlens. Optionally, the numerical aperture of the first superlens 10 is less than or equal to 0.8. Exemplarily, the half field of view of the first superlens 10 is less than or equal to 60°.

[0080] In some alternative implementations, see [link to implementation details]. Figure 3 As shown, the insertion device also includes a limiting member 50. The limiting member 50 is made of a material transparent to the operating wavelength of the first superlens 10. For example, the extinction coefficient of the limiting member to the operating wavelength is less than 0.1. According to an embodiment of this application, one end of the limiting member 50 is in surface contact with the end face of the optical fiber 20, and the other end of the limiting member 50 is in contact with the side of the first superlens 10 away from the aperture stop 30. The limiting member 50 can effectively support the first superlens 10 and also prevent the first superlens 10 from sliding axially within the cavity of the connector 40.

[0081] In some alternative embodiments of this application, such as Figure 4 and Figure 5 As shown, the distance between the first superlens 10 and the optical fiber 20 is zero. Figure 4 The left and right images show the end of fiber optic 20 facing the object under test and the end of fiber optic 20 near the endoscope system control device, respectively. Figure 4 The main body of optical fiber 20 is omitted. For example, as... Figure 4 As shown, the insertion device provided in this embodiment further includes a second superlens 60, which is disposed at the end of the optical fiber 20 away from the first superlens 10. Figure 4As shown, the distance between the first superlens 10 and the second superlens 60 and the optical fiber 20 is zero. Optionally, the surface of the first superlens 10 away from the object under test forms a surface contact with the end face of the optical fiber 20 near the object under test. Optionally, the surface of the second superlens 60 near the object under test forms a surface contact with the end face of the optical fiber 20 away from the object under test. The first superlens 10 focuses the incident light rays, and the second superlens 60 corrects the aberrations of the first superlens 10. It should be understood that in some optional embodiments, the first superlens 10 and / or the second superlens 60 can be chromatic aberration correcting superlenses.

[0082] According to the embodiments of this application, Figure 5 The left and right images show the end of fiber optic 20 facing the object under test and the end of fiber optic 20 near the endoscope system control device, respectively. Figure 5 The main body of fiber optic cable 20 has been omitted. For example... Figure 5 As shown, the insertion device provided in this embodiment further includes a second superlens 60, which is disposed at the end of the optical fiber 20 away from the first superlens 10. Figure 4 As shown, the distance between the first superlens 10 and the second superlens 60 and the optical fiber 20 is zero. Optionally, the surface of the first superlens 10 closest to the object under test is at the same height as the end face of the optical fiber 20 closest to the object under test. Optionally, the surface of the second superlens 60 furthest from the object under test is at the same height as the end face of the optical fiber 20 closest to the object under test.

[0083] According to the embodiments of this application, optionally, as follows: Figure 6 As shown, the optical fiber 20 provided in any of the above embodiments includes an image transmission fiber 201 and an illumination fiber 202. The image transmission fiber 201 is located inside the optical fiber 20 and is used to transmit the light received by the first superlens to the other end of the optical fiber 20; the illumination fiber is arranged around the image transmission fiber and is used to transmit illumination light to provide illumination to the area under test. It should be understood that the effective diameter of the end of the optical fiber 20 near the object under test (or the diameter of the image transmission fiber 201) is larger than the imaging portions of the first superlens and the second superlens.

[0084] Secondly, embodiments of this application also provide an endoscope system, such as... Figures 7 to 10 As shown, the endoscope system includes a control device and an insertion device for the endoscope system provided in any of the above embodiments. The control device includes an optical detector 70; the end of the optical fiber 20 in the insertion device, away from the first superlens 10, is connected to the control device. The optical detector 70 can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS).

[0085] See Figure 7 and Figure 8 The insertion device of this endoscope system adopts Figure 1 and Figure 3 The structure shown includes an image-side telecentric system consisting of an aperture stop 30 and a first superlens 10 at the end of the optical fiber 20 closest to the object under test. The end of the optical fiber 20 furthest from the first superlens 10 is connected to a control device. Between the end face of the optical fiber and the photosensitive surface of the optical detector 70, a microscope objective and a tube lens are arranged sequentially along the direction of light incidence. Optionally, as... Figure 8 As shown, the microscope objective 80 and / or the tube lens 90 can be a superlens.

[0086] See Figure 9 and Figure 10 The insertion device of this endoscope system adopts Figure 4 and Figure 5 The structure shown has a second superlens 60 disposed at the end of the optical fiber 20 away from the first superlens 10. Optionally, the imaging light rays exiting the second superlens 60 are not modulated before entering the photosensitive surface of the optical detector 70. Optionally, the imaging light rays exiting the second superlens 60 are modulated by the microscope objective 80 and the tube lens 90 before entering the photosensitive surface of the optical detector 70.

[0087] Next, combine Figures 11 to 16 This application provides a detailed description of the superlens provided in its embodiments. For example... Figure 11 As shown, the first superlens, second superlens, and other superlenses provided in this application embodiment all include a substrate layer 101 and a nanostructure layer 102. The nanostructure layer 102 includes nanostructures 1021 periodically arranged on one side of the substrate layer 101.

[0088] According to an embodiment of this application, optionally, in the nanostructure layer, the arrangement period of the nanostructures is greater than or equal to 0.3λ. c And less than or equal to 2λ c ; where λ c The wavelength is the center wavelength of the operating band. Optionally, according to an embodiment of this application, the height of the nanostructure in the nanostructure layer is greater than or equal to 0.3λ. c And less than or equal to 5λ c ; where λ c This is the center wavelength of the operating band.

[0089] Figure 12 and Figure 13 A perspective view of the nanostructure within the superlens is shown. Optionally, Figure 12 The nanostructures within are nanofins. Optionally, Figure 13 The nanostructure is cylindrical. Optionally, such as... Figure 12 and Figure 13As shown, the superlens also includes a filler 1022, which fills the spaces between the nanostructures 1021, and the material of the filler 1022 has an extinction coefficient of less than 0.01 for the operating wavelength. Optionally, the filler 1022 may comprise air or other materials that are transparent or translucent for the operating wavelength. According to embodiments of this application, the absolute value of the difference between the refractive index of the filler 1022 material and the refractive index of the nanostructure 1021 should be greater than or equal to 0.5.

[0090] In some optional embodiments of this application, such as Figures 14 to 16 As shown, the nanostructures included in the nanostructure layer 102 are arranged in an array in the form of a densely stackable pattern. Nanostructures 1021 are disposed at the vertices and / or center positions of this densely stackable pattern. In this embodiment, a densely stackable pattern refers to one or more patterns that can fill the entire plane without gaps or overlaps.

[0091] like Figure 14 As shown, according to an embodiment of this application, the nanostructures can be arranged in a fan shape. Figure 15 As shown, according to embodiments of this application, the nanostructures can be arranged in a hexagonal array. Furthermore, as... Figure 16 As shown, according to embodiments of this application, the nanostructures can be arranged in a square array. Those skilled in the art will recognize that the nanostructures can also include other forms of array arrangement, and all such variations are covered within the scope of this application.

[0092] Exemplary examples show that the nanostructures provided in this application can be polarization-independent structures, which impose a propagation phase on incident light. According to embodiments of this application, the nanostructures can be positive or negative structures. For example, the shapes of the nanostructures include cylinders, hollow cylinders, square prisms, hollow square prisms, etc.

[0093] Exemplarily, the nanostructure may have shapes including cylinders, hollow cylinders, square cylinders, and hollow square cylinders. Optionally, the nanostructure may be disposed at the center of a densely packed pattern. In optional embodiments of this application, the nanostructure may have shapes including cylinders, hollow cylinders, square cylinders, and hollow square cylinders. Optionally, the nanostructure may be disposed at the center of a densely packed pattern.

[0094] According to embodiments of this application, the shapes of the nanostructures include cylinders, hollow cylinders, square cylinders, and hollow square cylinders. Optionally, the nanostructure is a negative nanostructure, such as a square porous cylinder, a circular porous cylinder, a square ring cylinder, and a circular ring cylinder.

[0095] In one optional embodiment, the superlens provided in this application further includes an antireflective coating. The antireflective coating is disposed on the side of the substrate layer away from the nanostructure layer; alternatively, the antireflective coating is disposed on the side of the nanostructure layer adjacent to air. The function of the antireflective coating is to increase the transmission and reduce the reflection of incident radiation.

[0096] According to embodiments of this application, the nanostructure is made of a material with an extinction coefficient of less than 0.01 for the operating wavelength. For example, the nanostructure material includes fused silica, quartz glass, crown glass, flint glass, sapphire, crystalline silicon, amorphous silicon, and hydrogenated amorphous silicon. As another example, when the superlens operates in the near-infrared band, the nanostructure material includes one or more of silicon nitride, titanium oxide, gallium nitride, gallium phosphide, hydrogenated amorphous silicon, amorphous silicon, and crystalline silicon. As yet another example, when the superlens operates in the visible light band, the nanostructure material includes fused silica, quartz glass, crown glass, flint glass, sapphire, and alkaline glass. As yet another example, when the superlens operates in the far-infrared band, the nanostructure material includes one or more of crystalline silicon, crystalline germanium, zinc sulfide, and zinc selenide.

[0097] For example, the substrate material includes fused silica, quartz glass, crown glass, flint glass, sapphire, crystalline silicon, amorphous silicon, and hydrogenated amorphous silicon. As another example, when the superlens operates in the near-infrared band, the substrate material includes one or more of silicon nitride, titanium oxide, gallium nitride, gallium phosphide, hydrogenated amorphous silicon, amorphous silicon, and crystalline silicon. As yet another example, when the superlens operates in the visible light band, the substrate material includes fused silica, quartz glass, crown glass, flint glass, sapphire, and alkaline glass. As yet another example, when the superlens operates in the far-infrared band, the substrate material includes one or more of crystalline silicon, crystalline germanium, zinc sulfide, and zinc selenide.

[0098] In some embodiments of this application, the nanostructure is made of the same material as the substrate layer. In still other embodiments, the nanostructure is made of a different material than the substrate layer. Optionally, the filler is made of the same material as the substrate layer. Optionally, the filler is made of a different material than the substrate layer.

[0099] It should be understood that in some alternative embodiments of this application, the filler material differs from the material of the nanostructure. Exemplarily, the filler material is a high-transmittance material in the operating wavelength band, with an extinction coefficient less than 0.01. Exemplarily, the filler material includes fused silica, quartz glass, crown glass, flint glass, sapphire, crystalline silicon, amorphous silicon, and hydrogenated amorphous silicon.

[0100] According to the embodiments of this application, the phase of the superlens satisfies at least one of the following formulas (1-1) to (1-6):

[0101]

[0102]

[0103]

[0104]

[0105]

[0106]

[0107] Where r is the distance from the center of the superlens to the center of any nanostructure; λ is the operating wavelength. Let x and y be any phase related to the working wavelength, x and y be the mirror coordinates of the superlens, and f be the focal length of the first superlens.

[0108] The phase of a superlens can be expressed using high-order polynomials, including odd-order and even-order polynomials. To avoid disrupting the rotational symmetry of the superlens phase, optimization is typically limited to the phase corresponding to even-order polynomials, significantly reducing the design freedom of the superlens. However, among the formulas (1-1) to (1-6) above, formulas (1-3) and (1-4), compared to the others, can optimize the phase satisfying odd-order polynomials without breaking the rotational symmetry of the superlens phase, thus greatly increasing the optimization freedom of the superlens.

[0109] Example 1

[0110] Example 1 provides an endoscope system that employs... Figure 7 and Figure 8 The structure shown is illustrated, and the key parameters of this endoscope system are shown in Table 1. In Example 1, the nanostructure of the first superlens 10 is a silicon nitride nanocylinder. Figure 17 The relationship between the diameter of silicon nitride nanocylinders and the modulation phase is shown. Figure 18 The phase diagram of the first superlens is shown. (By...) Figure 17 and Figure 18 The phase coverage of the first superlens is shown to be from 0 to 2π. Figure 19 A modulation transfer function image of this endoscope system is shown. Figure 19 It can be seen that the endoscope system is close to the diffraction limit in all fields of view at 167 lp / mm, and has excellent imaging effect.

[0111] Table 1

[0112] project numerical values Operating wavelength (nm) 550 Numerical aperture (NA) 0.32 Superlens aperture (mm) 3.8 Field of view (°) 50 Aperture distance (mm) 2.5 Focal length (mm) 2.5 Outer diameter of bundled optical fibers (mm) 5 Number of fibers in a bundled fiber 10000

[0113] Example 2

[0114] Example 2 provides an endoscope system that employs... Figure 9 and Figure 10 The structure is shown in Table 2. Table 2 lists the key parameters of this endoscopic system. Figure 20 The phase diagram of the first superlens in this embodiment is shown. Figure 21 The phase diagram of the second superlens in this embodiment is shown. Figure 20 and Figure 21 It can be seen that the phases of both the first and second superlenses cover 0 to 2π. Figure 22 This demonstrates that the endoscope system approaches the diffraction limit in all fields of view at 167 lp / mm, exhibiting excellent imaging performance.

[0115] Table 2

[0116]

[0117]

[0118] In summary, the insertion device for an endoscope system provided in this application combines a first superlens and an optical fiber, eliminating the need for prisms and refractive lenses, reducing the diameter of the insertion device, and decreasing patient rejection and pain during endoscope system use. This insertion device achieves image-side telecentricity through the optical prism and the first superlens, resolving the problem of unclear imaging caused by assembly tolerances between the first superlens and the optical fiber. Furthermore, by placing the first and second superlenses on the end faces of the optical fiber respectively, the device overcomes the problem of errors in the spacing between the superlens and the optical fiber through focusing by the first superlens and aberration correction by the second superlens.

[0119] The endoscopic system provided in this application includes a control device and the aforementioned insertion device. By introducing a first superlens and an optical fiber, the diameter of the insertion device is reduced, thereby reducing patient discomfort during the use of the endoscopic system.

[0120] The above description is merely a specific implementation of the embodiments of this application, but the protection scope of the embodiments of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the embodiments of this application should be included within the protection scope of the embodiments of this application. Therefore, the protection scope of the embodiments of this application should be determined by the protection scope of the claims.

Claims

1. An insertion device for an endoscope system, characterized in that, The insertion device includes a first superlens (10), a second superlens (60), and an optical fiber (20); Wherein, the optical fiber (20) is a bundled optical fiber; the first superlens (10) is a Huygens superlens, the first superlens (10) is disposed at the end of the optical fiber (20) facing the object to be measured, and the distance between the first superlens (10) and the optical fiber (20) is zero; the second superlens (60) is disposed at the end of the optical fiber (20) away from the first superlens (10).

2. The insertion device as claimed in claim 1, characterized in that, The light-receiving surface of the first superlens (10) is at the same height as the end face of the optical fiber (20) away from the second superlens (60).

3. The insertion device as claimed in claim 2, characterized in that, The light-emitting surface of the second superlens (60) is at the same height as the end face of the optical fiber (20) away from the first superlens (10).

4. The insertion device according to any one of claims 1-3, characterized in that, The optical fiber (20) includes an image transmission optical fiber (201) and an illumination optical fiber (202); The image transmission fiber (201) is used to transmit the light received by the first superlens (10); The illumination fiber (202) is distributed around the image transmission fiber (201) to provide illumination.

5. The insertion device as claimed in claim 4, characterized in that, The optical fiber (20) comprises at least 5,000 single-mode optical fibers; any one of the single-mode optical fibers can transmit light of 200-2,500 nm.

6. The insertion device as claimed in claim 4, characterized in that, The length of the optical fiber (20) is greater than or equal to 0.2m.

7. The insertion device as claimed in claim 4, characterized in that, The outer diameter of the optical fiber (20) is less than or equal to 5 mm.

8. The insertion device as claimed in any one of claims 1-3, characterized in that, The first superlens (10) is also configured for chromatic aberration correction.

9. The insertion device as claimed in any one of claims 1-3, characterized in that, The second superlens (60) is a chromatic aberration correction superlens.

10. The insertion device as claimed in claim 8, characterized in that, The numerical aperture of the first superlens (10) is less than or equal to 0.

8.

11. The insertion device as claimed in claim 8, characterized in that, The half field of view of the first superlens (10) is less than or equal to 60°.

12. The insertion device as claimed in claim 8, characterized in that, The back focal length of the first superlens (10) is equal to the focal length of the first superlens (10).

13. The insertion device as claimed in claim 1, characterized in that, The insertion device also includes a gas-liquid channel and an actuator.

14. An endoscope system, characterized in that, The endoscope system includes a control device and an insertion device as described in claims 1-13; The control device includes an optical detector (70); The end of the optical fiber (20) away from the first superlens (10) is connected to the control device.

15. The endoscopic system as claimed in claim 14, characterized in that, The control device also includes a microscope objective (80) and a tube lens (90). The microscope objective (80) and the tube lens (90) are arranged sequentially between the optical fiber (20) and the photosensitive surface of the optical detector (70) along the direction of light incidence.

16. The endoscopic system as claimed in claim 15, characterized in that, The microscope objective (80) and / or the tube lens (90) are superlenses.

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