Endoscope

Abstract

The invention relates to an endoscope which comprises a catheter and a limiting structure. The catheter comprises a catheter main body and an expandable balloon; the balloon comprises a first part and a second part; the first end of the first part is connected with the second part; the second end of the first part is communicated with the catheter main body; the outer diameter of the first part is the same as the outer diameter of the catheter main body when the first part is not expanded; the second part is of an arc-shaped structure; the limiting structure is fixedly arranged at the joint of the first part and the second part; and the limiting structure is used for limiting the expansion degree of the second part of the balloon. The overall imaging effect can be improved, and the detection accuracy is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of medical devices, and in particular to an endoscope. Background Art

[0002] Cerebrovascular disease is a common disease type today. Cerebrovascular lesions can include thrombi (blood clots) or aneurysms (localized enlargement or weakening of blood vessels). Cerebrovascular thrombi may be associated with ischemic stroke, which in turn causes damage to brain tissue. Cerebrovascular aneurysms may be associated with the risk of rupture and hemorrhagic stroke, which also causes damage to brain tissue.

[0003] Existing technologies usually use external X-ray fluorescence imaging to evaluate lesions or their components or treatments, but the success rate of this type of fluorescence imaging guidance is low, and the radiation is large, which can easily cause complications to patients. In addition, there is also a radiation risk for operators of X-ray fluorescence imaging equipment. Long-term accumulation of manual operations will still lead to continuous accumulation of radiation doses, affecting the health of doctors. The use of endoscopes for medical diagnosis has been widely used in the medical field. Endoscopes can enter the natural cavities of the human body and provide intuitive images to inspect or treat the inside of blood vessels. However, there is blood in the blood vessels, and the presence of blood affects the visualization of the endoscope, making it impossible to obtain clear images, which in turn affects the detection or treatment effect. Summary of the invention

[0004] In order to solve the above technical problems, the present disclosure provides an endoscope.

[0005] In a first aspect, the present disclosure provides an endoscope, comprising: a catheter and a limiting structure;

[0006] The catheter comprises a catheter body and an expandable balloon;

[0007] The balloon includes a first part and a second part; the first end of the first part is connected to the second part; the second end of the first part is connected to the catheter body; the outer diameter of the first part when not expanded is the same as the outer diameter of the catheter body; the second part is an arc-shaped structure; the limiting structure is fixedly arranged at the connection between the first part and the second part; the limiting structure is used to limit the expansion degree of the second part of the balloon.

[0008] In some embodiments, the limiting structure is an annular pressing ring; the inner diameter of the annular pressing ring is the same as the outer diameter of the catheter body.

[0009] In some embodiments, the thickness of the balloon wall of the second portion is in the range of [0.105 mm, 0.095 mm].

[0010] In some embodiments, the radius of curvature of the second portion is greater than or equal to 3 mm.

[0011] In some embodiments, the balloon has a refractive index in the range of 1.47-1.51.

[0012] In some embodiments, the outer diameter of the catheter is less than 2 mm.

[0013] In some embodiments, an endoscope assembly is further included; the endoscope assembly is disposed inside the catheter; a cavity is formed between the endoscope assembly and the catheter; the cavity is used to place expansion fluid.

[0014] In some embodiments, the endoscope assembly includes an objective lens; the objective lens is located on a side close to the second part; the distance range between the surface of the objective lens close to the second part and the center of the inner wall of the second part is [0.1mm, 5mm].

[0015] In some embodiments, the endoscope assembly further includes an image acquisition unit, an illumination fiber, and an imaging fiber;

[0016] The image acquisition unit is located on a side away from the second part; the imaging optical fiber is located between the objective lens and the image acquisition unit; the illumination optical fiber surrounds the imaging optical fiber; and the extension directions of the illumination optical fiber and the imaging optical fiber are the same as the extension direction of the catheter.

[0017] In some embodiments, a controller and a power module are also included;

[0018] The controller is electrically connected to the image acquisition unit; the power module is electrically connected to the illumination optical fiber; the controller is used to receive image information acquired by the image acquisition unit; the power module is used to supply power to the illumination optical fiber.

[0019] Compared with the prior art, the technical solution provided by the present invention has the following advantages:

[0020] The endoscope disclosed in the present invention comprises: a catheter and a limiting structure; the catheter comprises a catheter body and an expandable balloon; the balloon comprises a first part and a second part; the first end of the first part is connected to the second part; the second end of the first part is connected to the catheter body; the outer diameter of the first part when not expanded is the same as the outer diameter of the catheter body; the second part is an arc-shaped structure; the limiting structure is fixedly arranged at the connection between the first part and the second part; the limiting structure is used to limit the expansion degree of the second part of the balloon. By providing an expandable balloon, blood is prevented from contaminating the lens of the endoscope, and the imaging clarity is improved. In addition, a limiting structure is provided, and the limiting structure is used to limit the expansion degree of the second part of the balloon, so as to avoid excessive deformation of the second part after expansion, resulting in distortion of the imaging at the edge of the field of view, and affecting the imaging quality. Therefore, the present invention can improve the overall imaging effect and improve the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0023] Figure 1 A schematic diagram of the structure of an endoscope before expansion provided by an embodiment of the present disclosure;

[0024] Figure 2 A schematic diagram of the structure of an expanded endoscope provided in an embodiment of the present disclosure;

[0025] Figure 3 A partial cross-sectional schematic diagram of an endoscope provided in an embodiment of the present disclosure;

[0026] Figure 4 An optical MTF diagram after balloon dilation provided by an embodiment of the present disclosure;

[0027] Figure 5 An optical MTF diagram before balloon expansion provided in an embodiment of the present disclosure.

[0028] Among them, 1. catheter; 10. catheter body; 2. limiting structure; 20. balloon; 21. first part; 22. second part; 3. endoscope assembly; 31. objective lens; 32. image acquisition unit; 33. illumination optical fiber; 34. imaging optical fiber; 4. chamber. DETAILED DESCRIPTION

[0029] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0030] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0031] The present disclosure provides an endoscope. Figure 1 A schematic diagram of the structure of an endoscope before expansion provided by an embodiment of the present disclosure, Figure 2 A schematic diagram of the structure of an expanded endoscope provided in an embodiment of the present disclosure, referring to Figure 1 and Figure 2 The endoscope comprises: a catheter 1 and a limiting structure 2. The catheter 1 comprises a catheter body 10 and an expandable balloon 20.

[0032] The balloon 20 includes a first part 21 and a second part 22; the first end of the first part 21 is connected to the second part 22; the second end of the first part 21 is connected to the catheter body 10; the outer diameter of the first part 21 when not expanded is the same as the outer diameter of the catheter body 10; the second part 22 is an arc-shaped structure; the limiting structure 2 is fixedly arranged at the connection between the first part 21 and the second part 22; the limiting structure 2 is used to limit the expansion degree of the second part 22 of the balloon 20.

[0033] For example Figure 1 , an endoscope structure is provided, the endoscope comprises a catheter 1 and a limiting structure 2, the actual length of the catheter 1 is relatively long, Figure 1 It is only used to illustrate the approximate relative position relationship between the components and does not represent the proportional relationship between the components of the actual object. The catheter 1 includes a catheter body 10 and an expandable balloon 20. The catheter body 10 can be, for example, a cylindrical structure with an unlimited length. The balloon 20 includes a first portion 21 and a second portion 22. The first end of the first portion 21 is connected to the second portion 22, and the second end of the first portion 21 is connected to the catheter body 10. The outer diameter of the first portion 21 when not expanded is the same as the outer diameter of the catheter body 10. After the expansion fluid is input, the balloon 20 expands under the action of the expansion fluid. Figure 1 The status in becomes Figure 2 In the state of the first part 21, the first part 21 is expanded. Based on the expanded first part 21, when the endoscope moves in the blood vessel, it can pass through some local stenosis or other blockages that may limit the passage of the catheter 1 to monitor the patient's physiological condition or perform some treatment.

[0034] In the prior art, the image information obtained by the endoscope in the blood vessel is easily interfered by the blood, and the presence of the balloon 20 can prevent the blood from contaminating the lens of the endoscope and improve the imaging clarity. In addition, the shape and size of the second part 22 affect the imaging quality of the endoscope. For example, through experiments or simulations, the target parameters of the second part 22 adapted when the imaging quality is better are obtained. If the second part 22 expands too much when the expansion fluid is injected into the endoscope, resulting in the parameter size of the second part 22 not matching the target parameters, for example, exceeding the target parameters, it will affect the final imaging quality and the imaging effect. In order to avoid the above situation, the embodiment of the present disclosure provides a limiting structure at the connection between the first part 21 and the second part 22. The limiting structure limits the expansion degree of the second part 22 to avoid excessive deformation of the second part 22 after expansion, which does not meet the target parameters and affects the imaging effect.

[0035] The embodiment of the present disclosure provides an expandable balloon to prevent blood from contaminating the endoscope lens and improve the imaging clarity. A limit structure is also provided to limit the expansion degree of the second part of the balloon to prevent the second part from deforming too much after expansion, which may cause the imaging at the edge of the field of view to be distorted and affect the imaging quality. As a result, the present disclosure can improve the overall imaging effect and detection accuracy.

[0036] In some embodiments, Figure 3 A partial cross-sectional schematic diagram of an endoscope provided in an embodiment of the present disclosure, referring to Figure 3 , and combined with Figure 1 and Figure 2 The limiting structure 2 is an annular pressing ring; the inner diameter of the annular pressing ring is the same as the outer diameter of the catheter body 10.

[0037] Exemplarily, the limiting structure 2 can be an annular pressure ring, which is nested in the connection between the first part 21 and the second part 22 of the balloon 20. The limiting structure 2 limits the expansion here, thereby preventing the second part 22 from deforming and affecting the imaging effect. Among them, the inner diameter of the annular pressure ring is the same as the outer diameter of the catheter body 10, that is, the same as the outer diameter of the unexpanded first part 21. The annular pressure ring is fixedly arranged at the connection between the first part 21 and the second part 22 of the balloon 20, thereby improving the fastening force here. After the expansion fluid is injected, the first part 21 expands and expands, and the presence of the annular pressure ring enhances the anti-expansion ability of the connection between the first part 21 and the second part 22 of the balloon 20, limits the expansion of the connection as the first part 21 is subjected to force, and thereby blocks the deformation of the second part 22. The embodiment of the present disclosure does not limit the fixing method of the limiting structure 2 and the connection, and the fixing method can be selected according to actual needs.

[0038] In some embodiments, the thickness of the balloon wall of the second portion is in the range of [0.105 mm, 0.095 mm].

[0039] When the endoscope moves in the blood vessel, the balloon is located at the front end, and the balloon squeezes the blood vessel so that the endoscope can obtain image information inside the blood vessel. In order to obtain clearer internal imaging of the blood vessel, there are certain requirements for the field of view angle. If the field of view angle is too small, only the image information in the direction in front of the balloon can be obtained, and the information of the blood vessel wall cannot be obtained, which does not meet the monitoring requirements. Therefore, a suitable field of view angle is required for monitoring. When the field of view angle is constant, the thicker the balloon wall of the second part is, the larger the diameter of the balloon is, but the size of the blood vessel is limited, and the diameter of the balloon is also limited. In addition, the thicker the balloon wall of the second part is, the more distortion will occur at the edge of the field of view, affecting the imaging effect. Therefore, when the field of view angle is constant, it is necessary to limit the thickness range of the balloon wall of the second part, for example, the thickness is [0.105mm, 0.095mm]. For the second part with a balloon wall thickness within this range, the field of view angle will not be too small, which can meet the imaging requirements, and the imaging effect is better, preventing edge distortion. Preferably, the thickness of the balloon wall of the second part is 0.1mm, and the imaging effect is optimal at this time.

[0040] In some embodiments, the radius of curvature of the second portion is greater than or equal to 3 mm.

[0041] The second part of the balloon is an arc-shaped structure, and the radius of curvature of the second part also affects the final imaging effect. If the radius of curvature is too small, the propagation path of the light will change too much after entering the balloon, which will make the final image too different from the actual object, resulting in the inability to truly restore the scene inside the blood vessel. In order to obtain clearer internal blood vessel imaging, the embodiment of the present disclosure limits the radius of curvature of the second part to be greater than or equal to 3mm. Within this range, the overall imaging effect meets the requirements. Preferably, the radius of curvature of the second part is 3mm, at which time the imaging effect is optimal. It should be noted that the embodiment of the present disclosure does not limit the specific value of the radius of curvature of the second part, as long as it meets the above requirements and can be adjusted according to actual needs.

[0042] In some embodiments, the refractive index of the balloon is in the range of 1.47-1.51.

[0043] Light enters the balloon from the blood through the balloon, and the balloon is usually filled with expansion fluid, and then reaches the optical element for imaging; due to the different materials of light, blood, and expansion fluid, the refractive index is also different. The different refractive index will eventually change the transmission path of the light, and the imaging effect after being projected onto the optical element will also be different. Therefore, in order to ensure the imaging effect, the embodiment of the present disclosure limits the refractive index range of the balloon, and a material with a refractive index range of 1.47-1.51 can be selected to make the balloon. Optionally, the refractive index range is 1.47-1.49. Preferably, the refractive index is 1.49. For example, using thermoplastic polyurethanes (TPU), the refractive index of TPU is generally between 1.4 and 1.5. However, the specific value may vary depending on the formulation and manufacturing process of TPU. For example, the refractive index range of aromatic TPU may be between 1.52 and 1.57, while the refractive index of aliphatic TPU may be lower, between 1.49 and 1.50, which can be adjusted according to needs.

[0044] In some embodiments, the outer diameter of the catheter is less than 2 mm.

[0045] The endoscope provided by the embodiment of the present disclosure is mainly used in blood vessels. If the diameter of the catheter entering the blood vessel is too large, the imaging information inside the blood vessel cannot be obtained, and monitoring or treatment cannot be performed. Based on the actual application scenario, the outer diameter of the catheter can be less than 2 mm. Within this range, the catheter can successfully complete the monitoring or treatment of the patient. Optionally, the endoscope can be applied to various chambers in the human patient's body. In addition to the vascular system of the brain and the vascular system adjacent to the heart, various chambers including peripheral veins and arteries, renal arteries, blood vessels in and around the brain, and blood vessels in other chambers can all use the endoscope.

[0046] In some embodiments, continue to refer to Figure 1 and Figure 2 , and also includes an endoscope component 3; the endoscope component 3 is arranged inside the catheter 1; a cavity 4 is formed between the endoscope component 3 and the catheter 1; the cavity 4 is used to place the expansion fluid.

[0047] Specifically, the endoscope assembly 3 is used to obtain images of the interior of the blood vessel. The endoscope assembly 3 is located inside the catheter 1. Due to the presence of the catheter, blood will not contaminate the endoscope assembly 3, reducing the impact on the imaging effect. A cavity 4 is formed between the endoscope assembly 3 and the catheter 1. An expansion fluid can be injected into the cavity 4. After the expansion fluid is injected, the first portion 21 of the balloon 20 expands and expands. Figure 1 The shape changes to something like Figure 2The expanded balloon 20 exerts a greater pressure on the inner wall of the blood vessel and can pass through some local stenosis or other blockages that may limit the passage of the catheter to detect the patient's physiological condition and perform some treatment work. In addition, when the endoscope assembly 3 collects imaging information, light will be incident through the second part 22 of the balloon 20 and imaged on the endoscope assembly 3 through the expansion fluid. The presence of the expansion fluid can also adjust the propagation path of the light and affect the imaging effect. Among them, the expansion fluid can be sodium chloride. In other embodiments, it can also be different materials, and the embodiments of the present disclosure are not limited to this.

[0048] In some embodiments, continue to refer to Figure 1 and Figure 2 The endoscope assembly 3 includes an objective lens 31; the objective lens 31 is located on a side close to the second portion 22; the distance between the surface of the objective lens 31 close to the second portion 22 and the center of the inner wall of the second portion 22 is in the range of [0.1 mm, 5 mm].

[0049] The endoscope assembly includes a variety of optical systems, such as an objective lens 31, which is located on one side of the second part 22 close to the balloon 20. The optical image information inside the blood vessel can be obtained through the objective lens 31. There is a certain distance between the objective lens 31 and the second part 22, and the expansion fluid will enter this area. Therefore, the light is incident through the second part 22 of the balloon 20, and is focused on the objective lens 31 through the expansion fluid to form an image. The distance between the objective lens 31 and the second part 22 is different, and the distance that the light passes through the expansion fluid is also different. Therefore, the position where it reaches the objective lens 31 will change, thereby affecting the final imaging effect. In order to ensure the imaging effect, the distance between the surface of the objective lens 31 close to the second part 22 and the center of the inner wall of the second part 22 can be set to [0.1mm, 5mm]. Within this range, the focusing effect is better and distortion can be avoided. Preferably, the distance between the surface of the objective lens 31 close to the second part 22 and the center of the inner wall of the second part 22 is 1mm. The center of the inner wall of the second portion 22 here refers to the center of the second portion 22 on the side close to the objective lens (the side in contact with the expansion fluid).

[0050] In some embodiments, continue to refer to Figure 1 and Figure 2 The endoscope assembly 3 also includes an image acquisition unit 32 , an illumination optical fiber 33 and an imaging optical fiber 34 .

[0051] The image acquisition unit 32 is located on a side away from the second portion 22 ; the imaging optical fiber 34 is located between the objective lens 31 and the image acquisition unit 32 ; the illumination optical fiber 33 surrounds the imaging optical fiber 34 ; and the extension directions of the illumination optical fiber 33 and the imaging optical fiber 34 are the same as the extension direction of the catheter 1 .

[0052] In addition to the objective lens 31, the endoscope assembly 3 also includes an image acquisition unit 32, an imaging fiber 34 located between the objective lens 31 and the image acquisition unit 32, and an illumination fiber 33 surrounding the outside of the imaging fiber 34. The illumination fiber 33 provides illumination light for the endoscope to avoid poor light in the blood vessel and the inability to obtain imaging information. Part of the illumination light is reflected in the blood vessel and enters the objective lens 31 through the balloon 20. The objective lens 31 transmits the acquired information to the image acquisition unit 32 via the imaging fiber 34 to obtain the final optical imaging information inside the blood vessel. Among them, the extension direction of the illumination fiber 33 and the imaging fiber 34 is the same as the extension direction of the catheter 1. The image acquisition unit 32 is away from the balloon 20, that is, the image acquisition unit 32 does not enter the blood vessel. The illumination fiber 33 is usually a plurality of optical fibers, and the embodiment of the present disclosure does not limit the specific number, while the imaging fiber 34 is usually a fiber bundle.

[0053] Exemplarily, the image acquisition unit is an image sensor, such as a CMOS (Complementary Metal Oxide Semiconductor). CMOS has small size, low power consumption, low cost, and high system integration. Through endoscope image acquisition and processing, brightness adjustment and specific intravascular images are performed on the image processing device and the image display device.

[0054] Exemplarily, the embodiment of the present disclosure is described by taking an improved endoscope as an example.

[0055] refer to Figure 1 and Figure 2 In the endoscope, an annular pressing ring is fixedly arranged at the connection between the first part 21 and the second part 22 of the balloon 20, the thickness of the balloon wall of the second part 22 is 0.1mm, the radius of curvature is greater than or equal to 3mm, the refractive index range of the balloon is 1.49, the outer diameter of the catheter 1 is less than 2mm, and the distance range between the surface of the objective lens close to the second part and the center of the inner wall of the second part is 1mm. Under this structure, even if the expansion fluid is injected, the annular pressing ring can prevent the second part 22 from expanding under the action of pressure and prevent the radius of curvature of the second part 22 from changing, so as to ensure that the imaging will not be distorted. Figure 4 This is an optical MTF diagram after balloon dilation provided by an embodiment of the present disclosure. Figure 5 This is an optical MTF diagram before balloon dilation provided by an embodiment of the present disclosure. Figure 4 and Figure 5 , where the horizontal axis is the spatial frequency and the vertical axis is the OTF modulus value. Figure 4 In the figure, S1 and L1 coincide, indicating that the meridian and sagittal MTFs of the 0 field of view reach 0.45. L2 indicates that the meridian MTF of the 0.7 field of view is 0.17. S2 indicates that the sagittal MTF of the 0.7 field of view is 0.38. The average MTF of the 0.7 field of view is 0.275. Figure 5 In the figure, S1' and L1' overlap, indicating that the meridian and sagittal MTFs of the 0 field of view reach 0.55, L2' indicates that the meridian MTF of the 0.7 field of view is 0.073, S2' indicates that the sagittal MTF of the 0.7 field of view is 0.34, and the average MTF of the 0.7 field of view is 0.205. The higher the MTF, the better the imaging effect, and the MTF after expansion is significantly higher than the MTF before expansion. The endoscopic effect before expansion is similar to that of an endoscope without improving the balloon size and without setting a limiting structure. In addition, the conventional MTF greater than 0.2 is an acceptable standard. Although the embodiment of the present disclosure sacrifices the imaging quality of the center to a small extent, the imaging quality of the center is still in a relatively high range, and the imaging quality of the edge is greatly improved, so that the imaging quality of the overall image is improved, and the improvement of the edge imaging quality further improves the detection accuracy.

[0056] In some embodiments, a controller and a power module are also included. The controller is electrically connected to the image acquisition unit; the power module is electrically connected to the illumination optical fiber; the controller is used to receive image information acquired by the image acquisition unit; and the power module is used to supply power to the illumination optical fiber.

[0057] Exemplarily, the endoscope further includes a controller and a power module, wherein the controller is electrically connected to the image acquisition unit to receive image information acquired by the image acquisition unit so that the image acquisition unit can display the image on a display screen for easy observation by the operator. Similarly, the controller can also be used to control the expansion fluid to enter the catheter, which can be set specifically according to needs. It can be the same controller or different controllers, and the embodiments of the present disclosure do not limit this. The power module is electrically connected to the lighting optical fiber to power the lighting optical fiber and improve the brightness of the light inside the blood vessel.

[0058] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0059] The above description is only a specific embodiment of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An endoscope, characterized in that: include: Catheter and limiting structure; The catheter comprises a catheter body and an expandable balloon; The balloon includes a first part and a second part; the first end of the first part is connected to the second part; the second end of the first part is connected to the catheter body; the outer diameter of the first part when not expanded is the same as the outer diameter of the catheter body; the second part is an arc-shaped structure; the limiting structure is fixedly arranged at the connection between the first part and the second part; the limiting structure is used to limit the expansion degree of the second part of the balloon.

2. The endoscope according to claim 1, characterized in that The limiting structure is an annular pressing ring; the inner diameter of the annular pressing ring is the same as the outer diameter of the catheter body.

3. The endoscope according to claim 1, characterized in that The thickness of the balloon wall of the second portion is in the range of [0.105 mm, 0.095 mm].

4. The endoscope according to claim 1, characterized in that The curvature radius of the second portion is greater than or equal to 3 mm.

5. The endoscope according to claim 1, characterized in that The refractive index of the balloon is in the range of 1.47-1.

51.

6. The endoscope according to claim 1, characterized in that The outer diameter of the catheter is less than 2 mm.

7. The endoscope according to claim 1, characterized in that It also includes an endoscope component; the endoscope component is arranged inside the catheter; a cavity is formed between the endoscope component and the catheter; the cavity is used to place expansion fluid.

8. The endoscope according to claim 7, characterized in that: The endoscope assembly includes an objective lens; the objective lens is located on a side close to the second part; the distance between the surface of the objective lens close to the second part and the center of the inner wall of the second part is in the range of [0.1 mm, 5 mm].

9. The endoscope according to claim 8, characterized in that The endoscope assembly also includes an image acquisition unit, an illumination optical fiber, and an imaging optical fiber; The image acquisition unit is located on a side away from the second part; the imaging optical fiber is located between the objective lens and the image acquisition unit; the illumination optical fiber surrounds the imaging optical fiber; and the extension directions of the illumination optical fiber and the imaging optical fiber are the same as the extension direction of the catheter.

10. The endoscope according to claim 9, characterized in that Also includes controller and power module; The controller is electrically connected to the image acquisition unit; the power module is electrically connected to the illumination optical fiber; the controller is used to receive image information acquired by the image acquisition unit; the power module is used to supply power to the illumination optical fiber.

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