CN115211799A

CN115211799A - Insertion device for endoscope system and endoscope system comprising same

Info

Publication number: CN115211799A
Application number: CN202210879383.9A
Authority: CN
Inventors: 郝成龙; 谭凤泽; 朱瑞; 朱健
Original assignee: Shenzhen Metalenx Technology Co Ltd
Current assignee: Shenzhen Metalenx Technology Co Ltd
Priority date: 2022-07-25
Filing date: 2022-07-25
Publication date: 2022-10-21

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. Wherein, this insertion device includes: a first superlens and an optical fiber; the first superlens is arranged at one end, facing the object to be measured, of the optical fiber; the first superlens is a huygens superlens, and the optical fiber is a bundled optical fiber. Through the insertion device and the endoscope system comprising the insertion device, the first super lens and the optical fiber are combined, a refraction lens, a prism and an optical detector in a traditional endoscope are omitted, the diameter of the insertion device is reduced, rejection response of a patient body to the endoscope is reduced, and pain caused by the endoscope is relieved.

Description

Insertion device for endoscope system and endoscope system comprising same

Technical Field

The present application relates to the field of endoscopy, in particular to an insertion device for an endoscopic system and an endoscopic system comprising the same.

Background

The endoscope system includes an insertion device and a control device. Wherein, insertion device one end has the probe, and the other end is connected with controlling means. When the inserting device is used, one end of the inserting device, which is provided with the probe, enters a position which cannot be observed by naked eyes, and the probe receives light rays emitted or reflected by an object to be detected and displays images in the control device. In some scenarios, the insertion device further comprises a gas and liquid channel for delivering a gas or drug into the patient. In some scenarios, the insertion device further includes an actuator for clearing diseased tissue.

The endoscope insertion device of the prior art has a probe including an objective lens, a prism and an illumination element for folding an optical path, and an optical detector. The objective lens is a refraction lens, and light rays received by the objective lens are transmitted to a photosensitive surface of the optical detector after being bent by the prism and are converted into electric signals.

In the prior art, a refractive lens, a prism, an illumination element and an optical detector are all integrated in a probe, so that the volume of the probe is increased, and particularly the diameter of the probe is increased. Therefore, the insertion device of the existing endoscope causes a strong rejection reaction (e.g., vomiting) and pain when it enters the patient.

Disclosure of Invention

In view of the above, in order to solve the technical problem that the diameter of the probe of the insertion device of the existing endoscope system is large, embodiments of the present application provide an insertion device for an endoscope system and an endoscope system including the same. The technical scheme of the application aims at the technical problem that the prior art solution is too single, and provides a solution which is obviously different from the prior art.

In a first aspect, the present application provides an insertion device for an endoscope system, wherein the insertion device includes a first superlens and an optical fiber;

the first superlens is arranged at one end, facing the object to be measured, of the optical fiber; the first superlens is a huygens superlens, and the optical fiber is a bundled optical fiber.

Optionally, the first superlens is spaced from the optical fiber by a distance greater than zero.

Optionally, the first superlens is spaced from the optical fiber by a distance equal to zero.

Optionally, the insertion device further comprises a diaphragm and a connecting piece;

the diaphragm is arranged on one side of the first super lens far away from the optical fiber, so that the diaphragm and the first super lens group form an image-space telecentric system;

the connecting piece is of a cylindrical structure; one end of the cylindrical structure is connected with the optical fiber, and the other end of the cylindrical structure faces towards an object to be measured; the diaphragm and the first superlens are coaxially arranged in the inner cavity of the cylindrical structure.

Optionally, a distance between the diaphragm and the first superlens is less than or equal to one focal length of the first superlens.

Optionally, the optical fiber has an outer diameter greater than an outer diameter of the connector.

Optionally, the insertion device further comprises a stopper;

one end of the limiting piece is in contact with the optical fiber surface; the other end of the limiting piece is in surface contact with one surface of the first superlens facing the optical fiber; the stopper is configured to be transparent to an operating wavelength band.

Optionally, the insertion device further comprises a second superlens;

the second superlens is arranged at one end, far away from the first superlens, of the optical fiber.

Optionally, the light receiving surface of the first superlens is as high as the end surface of the optical fiber far from the second superlens.

Optionally, the light exit surface of the second superlens is the same as the height of the end surface of the optical fiber far away from the first superlens.

Optionally, the optical fiber comprises an image transmission fiber and an illumination fiber;

the image transmission optical fiber is used for transmitting light received by the first superlens;

the illumination optical fibers are distributed around the image transmission optical fibers and used for providing illumination.

Optionally, the optical fiber comprises at least 5000 single mode optical fibers; any of the single mode optical fibers may conduct light between 200 nm and 2500 nm.

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

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

Optionally, the first superlens is a chromatic aberration correction superlens.

Optionally, the second superlens is a chromatic aberration correction superlens.

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

Optionally, a half field angle of the first superlens is less than or equal to 60 °.

Optionally, a back focal length of the first superlens is equal to a focal length of the first superlens.

Optionally, the insertion device further comprises a gas-liquid channel and an actuator.

In a second aspect, embodiments of the present application further provide an endoscope system, which includes a control device and the insertion device provided in any of the above embodiments;

the control device comprises an optical detector;

and one end of the optical fiber, which is far away from the first superlens, is connected with the control device.

Optionally, the control device further comprises a microscope objective and a tube lens;

the microscope objective and the tube lens are sequentially arranged between the optical fiber and the light sensing surface of the optical detector along the light incidence direction.

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

The insertion device for the endoscope system and the endoscope system comprising the insertion device provided by the embodiment of the application have the following advantages that:

the insertion device for endoscope system that this application embodiment provided sets up huygens super lens in optic fibre towards the one end of the object that awaits measuring, receives optical signal through huygens super lens, passes through optic fibre transmission light signal, does not include prism and photosensitive device, and the structure is simpler, and owing to reach the same focus effect, huygens super lens's volume and diameter all are less than refractive lens, and this insertion device's volume is littleer, and the diameter is thinner. A (c)

According to the endoscope system provided by the embodiment of the application, the first super lens and the optical detector are respectively arranged on the insertion device and the control device, and the optical signal of the first super lens structure of the insertion device is transmitted to the optical detector of the control device through the optical fiber. The separate first superlens and optical probe simplify the structure of the insertion device, reduce the diameter of the insertion device, and reduce rejection and pain of a patient when the endoscope system is used.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the background art of the present application, the drawings required to be used in the embodiments or the background art of the present application will be described below.

FIG. 1 shows an alternative schematic construction of an insertion device for an endoscope system provided by an embodiment of the present application;

FIG. 2 is a schematic view of an alternative insertion device for an endoscope system according to an embodiment of the present application;

FIG. 3 is a schematic view of an alternative insertion device for an endoscope system according to an embodiment of the present application;

FIG. 4 is a schematic view of an alternative insertion device for an endoscope system according to an embodiment of the present application;

FIG. 5 shows a schematic view of yet another alternative configuration of an insertion device for an endoscopic system provided by an embodiment of the present application;

FIG. 6 is a schematic view of yet another alternative construction of an insertion device for an endoscope system provided by an embodiment of the present application;

FIG. 7 illustrates an alternative structural schematic of an endoscopic system provided by an embodiment of the present application;

FIG. 8 is a schematic view of yet another alternative configuration of an endoscopic system provided by an embodiment of the present application;

FIG. 9 illustrates a further alternative structural schematic view of an endoscopic system provided by an embodiment of the present application;

FIG. 10 is a schematic view of yet another alternative configuration of an endoscope system provided by an embodiment of the present application;

FIG. 11 is a schematic diagram illustrating an alternative configuration of a superlens provided by an embodiment of the present application;

FIG. 12 is a schematic diagram illustrating an alternative structure of a nanostructure provided by an embodiment of the present application;

FIG. 13 is a schematic diagram illustrating an alternative structure of a nanostructure provided by an embodiment of the present application;

FIG. 14 shows an alternative arrangement of nanostructures provided by embodiments of the present application;

FIG. 15 is a schematic diagram illustrating yet another alternative arrangement of nanostructures provided by embodiments of the present application;

FIG. 16 shows a schematic view of yet another alternative arrangement of nanostructures provided by embodiments of the present application;

FIG. 17 is a graph showing an alternative relationship of feature size versus phase for nanostructures in a first superlens provided by embodiments of the present application;

FIG. 18 illustrates an alternative phase diagram for the first superlens provided by embodiments of the present application;

FIG. 19 illustrates an alternative modulation transfer function for the endoscopic system provided by the embodiments of the present application;

FIG. 20 is a diagram illustrating yet another alternative phase of the first superlens provided by an embodiment of the present application;

FIG. 21 illustrates yet another alternative phase diagram for the second superlens provided by an embodiment of the present application;

FIG. 22 illustrates yet another alternative modulation transfer function for an endoscopic system provided by an embodiment of the present application.

In the drawings, the figures respectively show:

10-a first superlens; 20-an optical fiber; 30-a diaphragm; 40-a connector; 50-a limit piece; 60-a second superlens; 70-an optical detector;

201-image transmission optical fiber; 202-illumination fibers;

101-a base layer; 102-a nanostructure layer; 1021-a nanostructure; 1022-filling.

Detailed Description

The present application will now be described more fully hereinafter with reference to the accompanying drawings, in which embodiments are shown. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Like reference numerals refer to like parts throughout. Also, in the drawings, the thickness, ratio and size of the components are exaggerated for clarity of illustration.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, "a," "an," "the," and "at least one" do not denote a limitation of quantity, but rather are intended to include both the singular and the plural, unless the context clearly indicates otherwise. For example, "a component" has the same meaning as "at least one component" unless the context clearly dictates otherwise. "at least one of" should not be construed as limited to the quantity "one". "or" means "and/or". The term "and/or" includes any and all combinations of one or more of the associated listed items.

Unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art. Terms defined in commonly used dictionaries should be interpreted as having the same meaning as is in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

The meaning of "comprising" or "comprises" indicates the property, quantity, step, operation, component, part or combination thereof, but does not exclude other properties, quantities, steps, operations, components, parts or combination thereof.

Embodiments are described herein with reference to cross-sectional views that are idealized embodiments. Thus, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, embodiments described herein should not be construed as limited to the particular shapes of regions as illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. For example, regions shown or described as flat may typically have rough and/or nonlinear features. Also, the acute angles shown may be rounded. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the precise shape of a region and are not intended to limit the scope of the claims.

Hereinafter, exemplary embodiments according to the present application will be described with reference to the accompanying drawings.

An insertion device for an endoscope system, as shown in fig. 1 to 6, 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 disposed at an end of the optical fiber 20 facing the object to be measured. When the endoscope system is in operation, the insertion device is at least partially advanced into a position that is not visible 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 to be measured is received by the first superlens 10 and then transmitted to the control device of the endoscope system through the optical fiber 20.

According to an embodiment of the present application, the optical fiber 20 is a bundled optical fiber including at least 5000 single mode fibers, each of which can transmit light having a wavelength of 200-2500 nm. Illustratively, the length of the optical fiber 20 is greater than or equal to 0.2m. In some alternative embodiments, the outer diameter of the optical fiber 20 is less than or equal to 5mm.

It should be noted that the superlens is a specific application of the super-surface technology, and modulates the amplitude, frequency, phase and polarization of incident light through the nano-structures periodically arranged on the substrate layer. A huygens superlens is a superlens designed according to the huygens principle. The distance between the first superlens 10 and the end face of the optical fiber 20 needs to be equal to the back focal length (in the order of micrometers) of the first superlens, requiring extremely high assembly accuracy. If assembly errors occur, the imaging quality of the endoscope system is reduced.

In some alternative embodiments, the first superlens 10 is spaced from the optical fiber 20 by a distance greater than zero. Further, as shown in fig. 1 to 3, the insertion device of the endoscope system provided by the embodiment of the present application further includes a diaphragm 30 and a connecting member 40. Referring to fig. 1 and 3, the diaphragm 30 is disposed in the object space of the first superlens 10, i.e. on the side of the first superlens 10 away from the optical fiber 20, so that the diaphragm 30 and the first superlens 10 form an image-side telecentric system. Light rays emitted or emitted by the object to be measured pass through the telecentric system and are imaged on the end face of the optical fiber 20. Because the chief ray of the image height defined in the image space telecentric system is parallel to the optical axis, the magnification of the imaging of the object to be measured does not change along with the change of the distance between the image surface and the first superlens 10. Therefore, a variation in the interval between the first superlens 10 and the end face of the optical fiber 20 due to the fitting (fitting tolerance) does not affect the imaging of the first superlens 10.

According to an embodiment of the present application, as shown in fig. 1 or 3, the connection member 40 has a cylindrical structure. One end of the cylindrical structure is connected to the optical fiber 20, and the other end faces the object to be measured. The diaphragm 30 and the first superlens 10 are arranged in the inner cavity of the cylindrical structure in sequence in the direction of incidence of the light. Optionally, the outer diameter of the optical fiber 20 is larger than the outer diameter of the connector 40. According to the embodiment of the present application, as shown in fig. 2, the diaphragm distance of the insertion device provided in the embodiment of the present application, that is, the distance between the diaphragm 30 and the first superlens 10 is less than or equal to one focal length of the first superlens 10. Optionally, a Back Focal Length (BFL) of the first superlens 10, that is, a distance between the end surface of the optical fiber 20 close to the first superlens and the first superlens is equal to an Effective Focal Length (EFL) 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 angle of the first superlens 10 is less than or equal to 60 °.

In some alternative embodiments, referring to fig. 3, the insertion device further comprises a stop 50. The limiting member 50 is made of a material transparent to the operating wavelength band of the first superlens 10. For example, the extinction coefficient of the limiting member to the operating band is less than 0.1. According to the embodiment of the present application, one end of the limiting member 50 is in surface contact with the end surface of the optical fiber 20, and the other end of the limiting member 50 is in surface contact with a side surface of the first superlens 10 away from the stop 30. The limiting member 50 can effectively support the first superlens 10 and prevent the first superlens 10 from sliding axially in the cavity of the connecting member 40.

In yet other alternative embodiments of the present application, as shown in fig. 4 and 5, the spacing of the first superlens 10 from the optical fiber 20 is equal to zero. The left and right views in fig. 4 show the end of the optical fiber 20 toward the object to be measured and the end of the optical fiber 20 near the endoscope system control device, respectively, and fig. 4 omits the main body of the optical fiber 20. Illustratively, as shown in fig. 4, the insertion device provided by the embodiment of the present application further includes a second superlens 60, and the second superlens 60 is disposed at an end of the optical fiber 20 far from the first superlens 10. As shown in fig. 4, the first superlens 10 and the second superlens 60 are each spaced from the optical fiber 20 by a distance equal to zero. Optionally, a side surface of the first superlens 10 away from the object to be measured is in surface contact with an end surface of the optical fiber 20 close to the object to be measured. Alternatively, a side surface of the second superlens 60 close to the object to be measured is brought into surface contact with an end surface of the optical fiber 20 far from the object to be measured. The first superlens 10 focuses the incident light and the second superlens 60 corrects the aberration of the first superlens 10. It is understood that in some alternative embodiments, the first superlens 10 and/or the second superlens 60 may be a chromatic aberration correcting superlens.

According to the embodiment of the present application, the left and right drawings in fig. 5 show the end of the optical fiber 20 toward the object to be measured and the end of the optical fiber 20 near the endoscope system control device, respectively, and fig. 5 omits the main body of the optical fiber 20. As shown in FIG. 5, the insertion device provided by the embodiment of the present application further includes a second superlens 60, and the second superlens 60 is disposed at an end of the optical fiber 20 far from the first superlens 10. As shown in fig. 4, the first superlens 10 and the second superlens 60 are each spaced from the optical fiber 20 by a distance equal to zero. Optionally, a side surface of the first superlens 10 near the object to be measured is the same as the height of the end surface of the optical fiber 20 near the object to be measured. Optionally, a side surface of the second superlens 60 away from the object to be measured is as high as an end surface of the optical fiber 20 close to the object to be measured.

According to an embodiment of the present application, optionally, as shown in fig. 6, the optical fiber 20 provided in any of the above embodiments includes an image fiber 201 and an illumination fiber 202. The image transmission fiber 201 is positioned at the inner side of the optical fiber 20 and is used for transmitting the light received by the first superlens to the other end of the optical fiber 20; the illumination light is arranged around the image transmission optical fiber and used for transmitting illumination light to provide illumination for the area to be measured. It should be understood that the effective diameter of the end of the optical fiber 20 close to the object to be measured (or the diameter of the image transmission fiber 201) is larger than the imaging portions of the first superlens and the second superlens.

In a second aspect, embodiments of the present application further provide an endoscope system, as shown in fig. 7 to 10, including a control device and an insertion device for an endoscope system provided in any of the embodiments described above. Wherein the control means comprises an optical probe 70; the end of the optical fiber 20 of the insertion device remote from the first superlens 10 is connected to a control device. The optical detector 70 may be a Charge Coupled Device (CCD) or a Complementary Metal-Oxide-Semiconductor (CMOS).

Referring to fig. 7 and 8, the insertion device of the endoscope system adopts the structure shown in fig. 1 and 3, and an image-side telecentric system consisting of a diaphragm 30 and a first superlens 10 is arranged at one end of the optical fiber 20 close to the object to be measured. The end of the optical fiber 20 remote 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 sequentially arranged along the light incidence direction. Alternatively, as shown in FIG. 8, the microscope objective 80 and/or the tube lens 90 may be a superlens.

Referring to fig. 9 and 10, the insertion device of the endoscope system adopts the structure shown in fig. 4 and 5, and a second superlens 60 is provided at an end of the optical fiber 20 remote from the first superlens 10. Alternatively, the imaging light rays exit the second superlens 60 without modulation and enter the photosensitive surface of the optical detector 70. Alternatively, the imaging light is emitted from the second superlens 60, modulated by the microscope objective 80 and the tube lens 90, and then emitted to the photosensitive surface of the optical detector 70.

The superlens provided by the embodiment of the present application will be described in detail with reference to fig. 11 to 16. As shown in fig. 11, the first superlens, the second superlens and other superlenses provided by the embodiments of the present application each include a base layer 101 and a nanostructure layer 102. The nanostructure layer 102 includes nanostructures 1021 arranged periodically on one side of the substrate layer 101.

According to an embodiment of the present application, optionally, in the nanostructure layer, the arrangement period of the nanostructures is greater than or equal to 0.3 λ _c And is less than or equal to 2 lambda _c (ii) a Wherein λ is _c The center wavelength of the operating band. According to an embodiment of the present application, optionally, the height of the nanostructures in the nanostructure layer is greater than or equal to 0.3 λ _c And is less than or equal to 5 lambda _c (ii) a Wherein λ is _c The center wavelength of the operating band.

Fig. 12 and 13 show perspective views of nanostructures in a superlens. Optionally, the nanostructure in fig. 12 is a nanofin. Alternatively, the nanostructures in fig. 13 are cylindrical structures. Optionally, as shown in fig. 12 and 13, the superlens further includes a filler 1022, the filler is filled between the nano-structures 1021, and an extinction coefficient of a material of the filler 1022 to the operating band is less than 0.01. Optionally, filler 1022 comprises air or other material that is transparent or translucent in the operating band. According to an embodiment of the present application, the absolute value of the difference between the refractive index of the material of the filler 1022 and the refractive index of the nanostructures 1021 should be greater than or equal to 0.5.

In some alternative embodiments of the present application, as shown in fig. 14 to 16, the nanostructures included in the nanostructure layer 102 are arranged in an array in a form of a close-packed pattern. The vertices and/or central locations of the close-packable pattern are provided with nanostructures 1021. In the embodiments of the present application, the close-packable patterns refer to one or more patterns that can fill the entire plane without gaps and without overlapping.

As shown in fig. 14, the arrangement of nanostructures may be arranged in a fan shape according to an embodiment of the present application. As shown in fig. 15, the arrangement of nanostructures may be arranged in an array of regular hexagons, according to embodiments of the present application. Further, as shown in fig. 16, the arrangement of nanostructures may be arranged in a square array according to embodiments of the present application. Those skilled in the art will recognize that nanostructures may also comprise other forms of array arrangements, and all such variations are within the scope of the present application.

Illustratively, the nanostructures provided by the embodiments of the present application may be polarization-independent structures, which impose a propagation phase on incident light. According to embodiments of the present application, the nanostructures may be positive structures or negative structures. For example, the shape of the nanostructures includes cylinders, hollow cylinders, square prisms, hollow square prisms, and the like.

Exemplary shapes of the nanostructures include cylinders, hollow cylinders, square pillars, and hollow square pillars. Optionally, the nanostructures are disposed in a central position of the close-packable pattern. In alternative embodiments of the present application, the shape of the nanostructures includes cylinders, hollow cylinders, square pillars, and hollow square pillars. Optionally, the nanostructures are disposed in a central position of the close-packable pattern.

According to embodiments of the present application, the shape of the nanostructure includes a cylinder, a hollow cylinder, a square pillar, and a hollow square pillar. Optionally, the nanostructure is a negative nanostructure, such as a square pore pillar, a circular pore pillar, a square ring pillar, and a circular ring pillar.

In an optional implementation manner, the superlens provided in the example of the present application further includes an antireflection film. The antireflection film is arranged on one side of the substrate layer away from the nanostructure layer; alternatively, an antireflection coating is disposed on a side of the nanostructure layer adjacent to air. The antireflection film plays a role in antireflection and reflection reduction on incident radiation.

According to an embodiment of the present application, the material of the nanostructure is a material having an extinction coefficient to the operating band of less than 0.01. For example, nanostructured materials include fused silica, quartz glass, crown glass, flint glass, sapphire, crystalline silicon, amorphous silicon, and hydrogenated amorphous silicon. For another example, when the operating wavelength band of the superlens is the near-infrared wavelength band, the material of the nanostructure includes one or more of silicon nitride, titanium oxide, gallium nitride, gallium phosphide, hydrogenated amorphous silicon, and crystalline silicon. For another example, when the working wavelength band of the superlens is visible light, the material of the nano-structure includes fused silica, quartz glass, crown glass, flint glass, sapphire and alkali glass. For another example, when the operating wavelength band of the superlens is the far infrared wavelength band, the material of the nanostructure includes one or more of crystalline silicon, crystalline germanium, zinc sulfide and zinc selenide.

For example, the material of the substrate layer includes fused silica, quartz glass, crown glass, flint glass, sapphire, crystalline silicon, amorphous silicon, and hydrogenated amorphous silicon. For another example, when the operating wavelength band of the superlens is the near infrared wavelength band, the material of the substrate layer includes one or more of silicon nitride, titanium oxide, gallium nitride, gallium phosphide, hydrogenated amorphous silicon, and crystalline silicon. As another example, when the working wavelength band of the superlens is the visible wavelength band, the material of the substrate layer includes fused silica, quartz glass, crown glass, flint glass, sapphire, and alkali glass. For another example, when the operating wavelength band of the superlens is the far infrared wavelength band, the material of the substrate layer includes one or more of crystalline silicon, crystalline germanium, zinc sulfide, and zinc selenide.

In some embodiments of the present application, the material of the nanostructures is the same as the material of the base layer. In still other embodiments of the present application, the material of the nanostructures is different from the material of the substrate layer. Optionally, the material of the filler is the same as the material of the base layer. Optionally, the material of the filler is different from the material of the base layer.

It should be understood that in yet other alternative embodiments of the present application, the filler is of a different material than the nanostructures. Illustratively, the material of the filler is a high-transmittance material in the working band, and the extinction coefficient of the high-transmittance material is less than 0.01. Exemplary materials for the filler include fused silica, quartz glass, crown glass, flint glass, sapphire, crystalline silicon, amorphous silicon, and hydrogenated amorphous silicon.

According to an embodiment of the present application, the phase of the superlens satisfies at least one of the following equations (1-1) to (1-6):

wherein r is the distance from the center of the superlens to the center of any nanostructure; lambda is the wavelength of operation and,

x, y are the mirror coordinates of the superlens, and f is the focal length of the first superlens.

The phase of the superlens may be expressed in higher order polynomials, including odd and even polynomials. In order not to destroy the rotational symmetry of the superlens phase, the phase corresponding to the even-order polynomial can be optimized, which greatly reduces the degree of freedom of design of the superlens. In the formulas (1-1) to (1-6), compared with the other formulas (1-3) and (1-4), the phase satisfying the odd polynomial can be optimized without destroying the rotational symmetry of the phase of the superlens, so that the optimization degree of freedom of the superlens is greatly improved.

Example 1

Embodiment 1 provides an endoscope system using the structures shown in fig. 7 and 8, and key parameters of the endoscope system are shown in table 1. In example 1, the nanostructure of the first superlens 10 is a silicon nitride nanocylinder. Fig. 17 shows the relationship between the diameter of the silicon nitride nanocylinder and the modulation phase. Fig. 18 shows a phase diagram of the first superlens. The phase coverage of the first superlens is 0 to 2 pi as shown by fig. 17 and 18. Fig. 19 shows a modulation transfer function image of the endoscope system. As can be seen from fig. 19, the endoscope system has an excellent imaging effect in which each field of view is close to the diffraction limit at 167 lp/mm.

TABLE 1

Item	Numerical value
		Operating wavelength (nm)	550
Numerical Aperture (NA)	0.32
		Super lens caliber (mm)	3.8
Angle of vision (°)	50
		Diaphragm distance (mm)	2.5
Focal length (mm)	2.5
		Outer diameter of bundle fiber (mm)	5
Number of optical fibers in bundled optical fibers	10000

Example 2

Embodiment 2 provides an endoscope system employing the structure shown in fig. 9 and 10. Table 2 gives the key parameters of the endoscopic system. Fig. 20 shows a phase diagram of the first superlens in this embodiment, and fig. 21 shows a phase diagram of the second superlens in this embodiment. As can be seen from fig. 20 and 21, the phases of the first and second superlenses both cover 0 to 2 pi. FIG. 22 shows that the endoscope system has excellent imaging effect at 167lp/mm, and each field of view is close to the diffraction limit.

TABLE 2

In summary, the insertion device for an endoscope system provided by the embodiment of the present application adopts the combination of the first superlens and the optical fiber, so that the prism and the refractive lens are omitted, the diameter of the insertion device is reduced, and the rejection and pain of the patient during the use of the endoscope system are reduced. The insertion device forms image space telecentric by the optical diaphragm and the first super lens, and solves the problem of unclear imaging caused by the assembly tolerance of the first super lens and the optical fiber. The insertion device also comprises a first super lens and a second super lens which are respectively arranged on the end faces of the two ends of the optical fiber, the first super lens is used for focusing, and the second super lens is used for carrying out aberration correction on the light of the first super lens, so that the problem that the distance between the super lenses and the optical fiber has errors is solved.

The endoscope system provided by the embodiment of the application comprises the control device and the insertion device, and the diameter of the insertion device is reduced by introducing the first superlens and the optical fiber, so that the discomfort of a patient during the use of the endoscope system is reduced.

The above description is only a specific implementation of the embodiments of the present application, but the scope of the embodiments of the present application is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the embodiments of the present application, and all the changes or substitutions should be covered within the scope of the embodiments of the present application. Therefore, the protection scope of the embodiments of the present application shall be subject to the protection scope of the claims.

Claims

1. An insertion device for an endoscopic system, characterized in that it comprises a first superlens (10) and an optical fiber (20);

wherein, the first superlens (10) is arranged at one end of the optical fiber (20) facing to the object to be measured; the first superlens (10) is a Huygens superlens, and the optical fiber (20) is a bundled optical fiber.

2. An insertion arrangement according to claim 1, characterized in that the first superlens (10) is spaced from the optical fibre (20) by a distance greater than zero.

3. An insertion arrangement according to claim 1, characterized in that the distance between the first superlens (10) and the optical fibre (20) is equal to zero.

4. An insertion device according to claim 2, characterized in that it further comprises a diaphragm (30) and a connecting piece (40);

the diaphragm (30) is arranged on one side of the first superlens (10) far away from the optical fiber (20), so that the diaphragm (30) and the first superlens (10) form an image-space telecentric system;

the connecting piece (40) is of a cylindrical structure; one end of the cylindrical structure is connected with the optical fiber (20), and the other end of the cylindrical structure faces towards an object to be measured; the diaphragm (30) and the first superlens (40) are coaxially arranged in the inner cavity of the cylindrical structure.

5. An insertion arrangement as claimed in claim 4, characterized in that the diaphragm (30) is spaced from the first superlens (10) by less than or equal to one focal length of the first superlens (10).

6. An insertion device according to claim 4, characterized in that the outer diameter of the optical fibre (20) is larger than the outer diameter of the connector (40).

7. The insertion device according to claim 6, characterized in that it further comprises a stop (50);

one end of the limiting piece (50) is in surface contact with the optical fiber (20); the other end of the limiting piece (50) is in surface contact with one surface of the first superlens (10) facing the optical fiber (20); the stopper (50) is configured to be transparent to an operating wavelength band.

8. The insertion device of claim 3, further comprising a second superlens (60);

the second super lens (60) is arranged at one end of the optical fiber (20) far away from the first super lens (10).

9. The insertion device according to claim 8, wherein the light receiving surface of the first superlens (10) is at the same height as the end surface of the optical fiber (20) remote from the second superlens (60).

10. An insertion arrangement as claimed in claim 9, characterized in that the exit face of the second superlens (20) is at the same height as the end face of the optical fibre (20) remote from the first superlens (10).

11. An insertion device according to any of claims 1-10, wherein the optical fiber (20) comprises an image-transmitting fiber (201) and an illumination fiber (202);

the image transmission optical fiber (201) is used for transmitting light received by the first superlens (10);

the illumination fibers (202) are distributed around the image transmission fiber (201) for providing illumination.

12. The insertion device of claim 11, wherein the optical fiber (20) comprises at least 5000 single mode optical fibers; any of the single mode optical fibers may conduct light between 200 nm and 2500 nm.

13. An insertion device according to claim 11, characterized in that the length of the optical fiber (20) is greater than or equal to 0.2m.

14. An insertion device according to claim 11, characterized in that the outer diameter of the optical fiber (20) is less than or equal to 5mm.

15. The insertion device according to any of claims 1 to 5 or 7 to 10, characterized in that the first superlens (10) is a chromatic aberration correcting superlens.

16. An insertion device according to claim 8 or 9, characterized in that the second superlens (60) is a chromatic aberration correcting superlens.

17. An insertion arrangement as claimed in claim 15, characterized in that the numerical aperture of the first superlens (10) is less than or equal to 0.8.

18. An insertion arrangement as claimed in claim 15, characterized in that the half field angle of the first superlens (10) is smaller than or equal to 60 °.

19. An insertion arrangement according to claim 15, characterized in that the back focal length of the first superlens (10) is equal to the focal length of the first superlens (10).

20. The endoscopic system of claim 1 wherein said insertion device further comprises an air and liquid channel and an actuator.

21. An endoscopic system, comprising a control device and an insertion device as claimed in any one of claims 1 to 20;

the control device comprises an optical probe (70);

the end of the optical fiber (20) far away from the first superlens (10) is connected with the control device.

22. An endoscope system according to claim 21 and wherein said control means further comprises a microscope objective (80) and a tube lens (90);

the micro objective (80) and the tube lens (90) are sequentially arranged between the optical fiber (20) and the light-sensitive surface of the optical detector (70) along the incident direction of light.

23. An endoscope system according to claim 22, characterized in that said micro objective (80) and/or said tube lens (90) is a superlens.