Front-end structure of endoscope, insertion portion, and endoscope

Abstract

A front-end structure of an endoscope, an insertion portion, and an endoscope, relating to the technical field of medical instruments. The front-end structure comprises a front-end housing (100), wherein a mounting hole (110) is formed in a distal end face of the front-end housing; a camera module (200) mounted in the mounting hole (110), wherein an accommodating gap (120) is formed between the camera module (200) mounted in place and a distal opening of the mounting hole (110); a light-transmitting disc (300) movably arranged in the accommodating gap (120), wherein the light-transmitting disc (300) is provided with rotating portions (310), and a plurality of rotating portions (310) are evenly distributed circumferentially on a proximal end face of the light-transmitting disc (300); and a water spray member (400) comprising a spray portion (410) and a circulation portion (420), wherein the spray portion (410) is disposed on the front-end housing (100), and the spray portion (410) is provided with a spray port (411) facing a distal end face of the light-transmitting disc (300); and the circulation portion (420) is arranged in the front-end housing (100) and is communicated with the spray portion (410), and used for allowing a flushing liquid to enter from a proximal end of the endoscope and flow into the spray portion (410), so that the flushing liquid is sprayed to the distal end face of the light-transmitting disc (300) by means of the spray port (411). The front-end structure has the advantage of being capable of solving the problem of blurred imaging of the camera module.

Description

An endoscope's front end structure, insertion part, and endoscope. Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to an endoscope's front end structure, insertion part, and endoscope. Background Technology

[0002] An endoscope is a commonly used medical device, generally consisting of a flexible part, a light source, and a lens. During use, the endoscope is inserted into the patient's body through natural openings or surgical incisions. Once the endoscope is inserted into the organ to be examined, the doctor can directly visualize lesions in the relevant area.

[0003] An endoscope includes an operating handle and an insertion section. During surgery, the doctor inserts the insertion section into the body through the body cavity. The insertion section contains a camera module and an instrument tube. The camera module is electrically connected to the camera host. By controlling the operating handle, the active bending section at the front end of the insertion section can be pulled by a traction rope to achieve bending action, thereby changing the orientation of the front end of the insertion section, allowing the camera module to display the image it receives on the camera host.

[0004] The inventors discovered during multiple surgeries that after the insertion device was inserted into the human body cavity, the image displayed on the camera host by the camera module often appeared blurry, which affected the doctor's observation. Summary of the Invention

[0005] To address the problem of blurry images from camera modules, this application provides a front end structure, an insertion part, and an endoscope.

[0006] This application provides a front-end structure, which adopts the following technical solution:

[0007] A front-end structure for use in the insertion part of an endoscope, characterized in that it comprises: a front-end housing having a mounting hole on its distal surface; a camera module mounted in the mounting hole, with a receiving gap formed between the mounted camera module and the distal opening of the mounting hole; a transparent optical disc movably disposed within the receiving gap, the transparent optical disc having a rotating portion, the rotating portion being circumferentially distributed in a plurality of such portions on the proximal surface of the transparent optical disc; and a water spray component including a spraying portion and a flow portion, the spraying portion being disposed in the front-end housing and the spraying portion having a direction towards the transparent optical disc. The distal end face has a spray nozzle; the flow section is located inside the front end housing and communicates with the spray section, for allowing flushing fluid to enter from the proximal end of the endoscope and flow into the spray section, so that the flushing fluid is sprayed through the spray nozzle onto the distal end face of the transparent optical disc, wherein the outer peripheral wall of the camera module and the inner peripheral wall of the mounting hole form an annular gap, the rotating part extends into the annular gap, and the annular gap partially overlaps with the flow path of the flushing fluid in the flow section, so that the transparent optical disc rotates circumferentially within the accommodating gap under the action of the flushing fluid.

[0008] The present invention has the following advantages and beneficial effects:

[0009] The overall design effectively solves the problem of blurred images during endoscopic surgery by introducing key components such as the transmission disc, jet section, and flow section. The optimized structure of the transmission disc, especially its outward-protruding refractive surface at the distal end, significantly improves light refraction and focusing efficiency, thereby enhancing the imaging quality of the camera module. Clear images are crucial for doctors' diagnosis and treatment; this design directly enhances the reliability and effectiveness of endoscopes in clinical applications.

[0010] The protruding design of the jet nozzle and its excellent fit with the transmission disc ensure that the rinsing fluid can efficiently and evenly cover the surface of the transmission disc. By optimizing the angle and pressure of the jet fluid, dirt and bodily fluids during the rinsing process can be quickly removed, keeping the transmission disc clean. This feature not only improves the cleaning efficiency of the endoscope but also reduces the risk of misdiagnosis by doctors during surgery due to blurred images, thereby ensuring patient safety.

[0011] The segmented design of the flow section allows the rinsing fluid to flow smoothly between different areas, ensuring effective fluid transfer during the cleaning process. The overlapping design of the flow path and the annular gap allows the transparent disc to rotate circumferentially under the action of the rinsing fluid. This dynamic cleaning mechanism further enhances the cleaning effect and ensures the optimal performance of the transparent disc during use.

[0012] The ingenious combination of the rotating part and the flow path enhances the liquid spraying effect of the spray section, thereby strengthening the cleaning ability of the transparent disc. This innovative design uses hydrodynamics to drive the transparent disc to rotate, allowing the rinsing fluid to fully exert its effect during the flow process, effectively avoiding cleaning blind spots that may be caused by static rinsing. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 is a schematic diagram of the front-end housing structure of some embodiments of this application;

[0015] Figure 2 is a partial cross-sectional view of the front housing of some embodiments of this application;

[0016] Figure 3 is a partial cross-sectional view of the front housing of some embodiments of this application;

[0017] Figure 4 is a schematic diagram of the front-end housing structure of some embodiments of this application;

[0018] Figure 5 is a magnified view of a portion of Figure 3;

[0019] Figure 6 is a schematic diagram of the structure of a transparent optical disc according to some embodiments of this application;

[0020] Figure 7 is a partial cross-sectional view three of the front housing of some embodiments of this application;

[0021] Figure 8 is an enlarged view of part A in Figure 7;

[0022] Figure 9 is a schematic diagram of the structure of an endoscope according to some embodiments of this application.

[0023] The diagram is marked as follows:

[0024] 100. Front housing; 110. Mounting hole; 120. Accommodation gap; 130. Annular gap; 140. Limiting seal; 200. Camera module; 300. Transparent optical disc; 310. Rotating part; 400. Water spray component; 410. Spraying part; 411. Spray nozzle; 420. Flow section; 421. First flow section; 422. Second flow section; 423. Third flow section; 500. Operating handle. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0026] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0027] To address the issue of blurry images in the camera module, the inventors analyzed the problem and concluded that the blurriness at the front of the camera module was primarily due to bodily fluids adhering to its surface during surgery. The presence of these fluids prevented the camera module from clearly capturing images of the lesion, affecting the doctor's visual clarity and the accuracy of their judgment.

[0028] This technical problem not only frequently arises during the use of endoscopes but also directly and negatively impacts the efficiency of surgeons and the treatment outcomes for patients. Blurry images prevent surgeons from accurately determining the location of lesions during surgery, potentially leading to misdiagnosis or missed diagnosis. Furthermore, in complex surgeries, surgeons often need to make rapid decisions based on images; unclear images undoubtedly increase the risk of surgery and may even prolong the operation time, affecting the patient's recovery.

[0029] Based on this, this application proposes a front end structure for an endoscope.

[0030] Referring to Figures 1-9, in some embodiments, this front-end structure is applied to the insertion part of an endoscope, including a front-end housing 100, a camera module 200, a transparent optical disc 300, and a water spray component 400. The distal end face of the front-end housing 100 is provided with a mounting hole 110, the camera module 200 is mounted within the mounting hole 110, and an accommodating gap 120 is formed between the distal openings of the mounting hole 110.

[0031] For example, the camera module 200 is electrically connected to the camera host via a wire provided in the insertion part, so that the image captured by the camera module 200 at the far end of the front end structure can be projected onto the display screen of the camera host to facilitate the doctor's observation of lesions in the human body cavity.

[0032] The transparent optical disc 300 is movably disposed within the receiving gap 120. For example, the cross-sectional shape of the transparent optical disc 300 is circular, and the cross-sectional shape of the receiving gap 120 is also circular. The inner diameter of the receiving gap 120 is adapted to the outer diameter of the transparent optical disc 300 so that the transparent optical disc 300 can be embedded in the receiving gap 120. The movement of the transparent optical disc 300 within the receiving gap 120 is rotation, that is, the transparent optical disc 300 can rotate around the central axis of the receiving gap 120 under the driving force of an external force.

[0033] The water spray component 400 includes a spray section 410 and a flow section 420. The spray section 410 is disposed on the front end housing 100. For example, the spray section 410 protrudes from the distal end of the front end housing 100 and is located on one side of the mounting hole 110. Further, the spray section 410 has a spray nozzle 411 facing the distal end face of the optical disc 300. Thus, when rinsing fluid is ejected from the spray nozzle 411, the rinsing fluid can directly flush the distal end face of the optical disc 300, thereby washing away bodily fluids on the distal end face of the optical disc 300.

[0034] The flow section 420 is disposed within the front housing 100 and communicates with the spray section 410. It allows irrigation fluid to enter from the proximal end of the endoscope and flow into the spray section 410, so that the irrigation fluid is sprayed through the spray nozzle 411 onto the distal surface of the transmission disc 300. Exemplarily, the flow section 420 extends to the handle via the insertion section and extends to the outside of the handle via an instrument tube on the handle, facilitating communication between the water supply mechanism and the flow section 420. The water supply mechanism pumps the irrigation fluid into the flow section 420, which is then sprayed out from the spray nozzle 411 of the spray section 410. Exemplarily, the flow section 420 is configured as a tube that allows the irrigation fluid to flow normally within the insertion section.

[0035] For example, the transparent optical disc 300 has a rotating portion 310, and multiple rotating portions 310 are evenly distributed circumferentially on the near end face of the transparent optical disc 300. At the same time, the outer peripheral wall of the camera module 200 and the inner peripheral wall of the mounting hole 110 form an annular gap 130. The rotating portion 310 extends into the annular gap 130, and the annular gap 130 partially coincides with the flow path of the rinsing liquid in the flow section 420, so that the transparent optical disc 300 rotates circumferentially within the receiving gap 120 under the action of the rinsing liquid.

[0036] Thus, a mounting hole 110 is provided on the distal end face of the front housing 100, which provides a stable foundation for the installation of the camera module 200. When the camera module 200 is installed in the mounting hole 110, the annular gap 130 formed between the outer peripheral wall of the camera module 200 and the inner peripheral wall of the mounting hole 110 is crucial for enabling the rotation of the optical disc 300. This design ensures that the camera module 200 not only maintains a stable position during observation but also avoids interference from foreign objects that could affect the imaging effect.

[0037] The transparent disc 300 is rotatably disposed within the receiving gap 120 and is equipped with multiple circumferentially distributed rotating parts 310, which can rotate circumferentially under the action of the rinsing fluid. When the rinsing fluid flows into the spray nozzle 400 through the flow section 420, its flow provides power to the spray nozzles 410 and impacts the rotating parts 310, driving the transparent disc 300 to rotate within the receiving gap 120. The spray nozzles 411 of the spray nozzles 410 face the distal end face of the transparent disc 300, and the sprayed water flow washes its surface through the hydrodynamic effect, removing adhering body fluids or impurities.

[0038] In actual use, the flushing fluid enters the flow section 420 from the proximal end of the endoscope and flows to the spray section 410 via its connection with the spray section 410. As the flushing fluid flows through the flow section 420, its flow path partially overlaps with the annular gap 130, causing the transparent disc 300 to rotate. The annular gap 130 provides additional hydrodynamic force, allowing the transparent disc 300 to continue rotating under the push of the flushing fluid, thus improving the cleaning effect. This design ensures that the flow of the flushing fluid in the flow section 420 both drives the rotation of the transparent disc 300 and ensures that the water flow from the spray section 410 fully acts on the surface of the transparent disc 300. The water flow impact combined with the rotation of the transparent disc 300 creates a powerful cleaning effect, significantly reducing blurring caused by residual bodily fluids.

[0039] In some embodiments, as shown in Figures 3 and 5, the flow section 420 has at least a first flow segment 421, a second flow segment 422, and a third flow segment 423 connected in sequence. The distal end of the first flow segment 421 is connected to the spray section 410, and the proximal end of the third flow segment 423 is connected to the endoscope's operating handle 500 via the insertion section. The flow path of the flushing fluid in the second flow segment 422 partially overlaps with the annular gap 130. For example, the sidewall of the second flow segment 422 near the annular gap 130 is completely open, resulting in better communication between the second flow segment 422 and the annular gap 130. When the flushing fluid passes through the second flow segment 422, a portion of the flushing fluid can be normally diverted into the annular gap 130.

[0040] When the doctor activates the flushing function, the flushing fluid enters the flow section 420 from the endoscope's operating handle 500, quickly reaches the spray section 410 after passing through the first flow segment 421. This process ensures an adequate supply of flushing fluid in the spray section 410, thereby enhancing the water flow dynamics at the spray nozzle 411 of the spray section 410 and providing strong support for cleaning the transparent disc 300.

[0041] By setting the third flow section 423, the flow of the flushing fluid is effectively guided, forming a closed flow path, which makes the flushing fluid flow more smoothly throughout the system, thereby improving the fluid flow efficiency, reducing fluid flow resistance, and ensuring the continuity and stability of the flushing effect.

[0042] More importantly, the design that the flow path of the rinsing fluid in the second flow section 422 partially overlaps with the annular gap 130 further enhances the cleaning capability of the transparent disc 300. During the flow of the rinsing fluid, the annular gap 130 provides crucial hydrodynamic support for the rotation of the transparent disc 300. Due to the overlap of the flow paths, the rinsing fluid, when passing through the second flow section 422, directly acts on the rotating parts 310, pushing these rotating parts 310 to move, thereby more effectively realizing the rotation of the transparent disc 300 within the receiving gap 120.

[0043] In some embodiments, referring to FIG5, the extension path of the second flow section 422 is tangential to the outer periphery of the annular gap 130, so that the rinsing fluid flowing within the second flow section 422 applies a tangential thrust to the rotating part 310. Thus, when the rinsing fluid flows through the second flow section 422, because its extension path is tangential to the outer periphery of the annular gap 130, the rinsing fluid acts tangentially on the rotating part 310, allowing the transparent disc 300 to rotate more flexibly and enhancing the cleaning effect of the rinsing fluid on the surface of the transparent disc 300. Due to the direct impact of the rinsing fluid on the rotating part 310, dirt and bodily fluids adhering to the surface of the transparent disc 300 are removed more effectively. Furthermore, the application of tangential thrust ensures that the flow of the rinsing fluid is not slowed down due to resistance, thereby optimizing the overall efficiency of the liquid flow.

[0044] In some embodiments, as shown in Figures 7 and 8, the proximal opening of the third flow section 423 is inclined toward the annular gap 130. Exemplarily, the proximal opening of the third flow section 423 is a connection port with the second flow section 422. The inclined opening design allows the rinsing fluid to contact the rotating part 310 at a certain angle when flowing into the annular gap 130. This adjustment of the flow direction not only reduces the resistance to fluid flow but also enhances the impact force of the rinsing fluid on the rotating part 310 and the transparent disc 300, promoting the rotation and cleaning process of the transparent disc 300. The flow of the rinsing fluid within the annular gap 130 becomes more uniform, effectively avoiding cleaning blind spots caused by uneven flow rates.

[0045] In addition, the design of the inclined opening allows the rinsing fluid to continuously apply pressure to the rotating part 310, which not only continuously drives the rotation of the transparent disc 300, but also ensures that the rinsing fluid can continuously rinse the surface of the transparent disc 300.

[0046] In some embodiments, the end of the rotating part 310 away from the transparent disc 300 extends into the second flow section 422 and is located in the flow path of the rinsing liquid. When the rinsing liquid flows through the second flow section 422, the rotating part 310 is impacted by the liquid, creating a direct hydrodynamic effect that causes the rotating part 310 to rotate, thereby significantly improving the cleaning efficiency of the transparent disc 300. Furthermore, this structure has the advantage that the extension position of the rotating part 310 ensures that it is always located in the core area of ​​the rinsing liquid flow, avoiding a reduction in cleaning effect due to uneven flow.

[0047] In some embodiments, referring to Figures 5 and 6, the rotating part 310 extends obliquely from the distal end to the proximal end; and / or, when the rotating part 310 is close to the second flow section 422, the angle formed between the extension path of the rotating part 310 from the distal end to the proximal end and the flow path of the flushing fluid in the second flow section 422 is an acute angle. The oblique extension design of the rotating part 310 allows it to better interact with the flowing flushing fluid during rotation. When the flushing fluid flows through the second flow section 422, the oblique rotating part 310 can more effectively capture and utilize the power brought by the liquid flow, which not only improves the rotation efficiency of the rotating part 310, but also ensures that the liquid can fully act on the surface of the transparent disc 300, maximizing the removal of attached dirt and body fluid residue.

[0048] Furthermore, the acute angle design formed by the rotating part 310 and the flow path of the rinsing fluid further enhances the transmission of flow dynamics. Because the angle is acute, the rinsing fluid applies torque more directly as it passes through the rotating part 310, allowing the rotating part 310 to begin rotating more quickly. This optimization of flow dynamics effectively reduces the frictional resistance between the rinsing fluid and the rotating part 310, thereby increasing the rotational speed of the transparent disc 300.

[0049] In practical applications, the benefits of this design are evident in several aspects. First, the tilted rotating part 310 can better adapt to the flow direction of the rinsing fluid, maintaining smooth fluid flow. Second, the tilted design ensures that the performance of the transparent disc 300 will not be reduced due to the rotating part 310 interfering with the flow path when it rotates.

[0050] In some embodiments, referring to FIG5, the front housing 100 has a limiting seal portion 140, which is circumferentially embedded in the distal opening edge of the mounting hole 110. Exemplarily, the limiting seal portion 140 and the edge of the distal surface of the optical disc 300 are axially opposite to each other in the front housing 100. Thus, when the optical disc 300 tends to move outward from the receiving gap 120, the limiting seal portion 140 can limit the optical disc 300, making it difficult for the optical disc 300 to detach from the receiving gap 120. During rinsing, the rinsing fluid pushes the limiting seal 140 to abut against the edge of the distal surface of the transparent disc 300, thus forming a sealing fit. This prevents the rinsing fluid entering the annular gap 130 from flowing out of the gap between the transparent disc 300 and the limiting seal 140, improving the utilization rate of the rinsing fluid. This allows most of the rinsing fluid to be sprayed out from the spray nozzle 411, while maintaining a good pressurization state as the rinsing fluid flows in the flow section 420. This increases the pressure of the rinsing fluid sprayed out from the spray nozzle 411, allowing the pressurized rinsing fluid to more easily clean away the body fluids adhering to the distal surface of the transparent disc 300.

[0051] In some embodiments, as shown in Figures 3 and 4, the spray section 410 protrudes from the distal end of the front housing 100 and is located on one side of the mounting hole 110. Furthermore, the extended path of the axis of the spray nozzle 411 intersects the distal surface of the transparent optical disc 300.

[0052] Thus, the protruding design of the spray section 410 allows it to directly face the transparent disc 300 during rinsing, ensuring that the sprayed liquid accurately and efficiently covers the surface of the transparent disc 300. When the rinsing liquid is sprayed out through the spray section 410, the spray angle and impact force of the liquid are maximized. This direct liquid impact can quickly remove dirt and bodily fluids adhering to the transparent disc 300, significantly improving the cleaning effect.

[0053] The design of the extended path of the jet nozzle 411 intersecting with the distal surface of the transparent disc 300 further optimizes the distribution of the jet liquid. In this way, the jet liquid not only directly impacts the surface of the transparent disc 300, but also forms a more ideal liquid flow pattern upon contact, ensuring that the rinsing liquid is evenly distributed across the entire surface of the transparent disc 300, effectively avoiding cleaning blind spots caused by uneven liquid distribution.

[0054] In some embodiments, the distal surface of the optical disc 300 protrudes outward (not shown in the figure). For example, the distal surface of the optical disc 300 is a refractive surface. This protruding design of the distal surface of the optical disc 300 effectively optimizes light refraction and focusing. When light passes through the optical disc 300, the refractive surface design allows the light to enter the camera module 200 at an optimal angle, thereby reducing image distortion caused by improper light refraction.

[0055] The refractive surface structure of the translucent disc 300 also plays a positive role in the cleaning process. Because the distal end protrudes outward, the rinsing solution can better cover and clean the surface of the translucent disc 300, while body fluids are less likely to adhere to the translucent disc 300, thereby reducing the interference of dirt and body fluids on light.

[0056] The refractive surface design of the transmissive optical disc 300 also demonstrates superior performance in handling light from different angles. Due to its unique curvature, the transmissive optical disc 300 can effectively focus light from various angles, enabling the imaging module 200 to obtain clear images under various operating conditions. This feature is particularly important in complex surgical environments, effectively reducing imaging problems caused by angle changes and improving the surgeon's confidence and accuracy.

[0057] Please refer to Figures 1 to 9. This application also provides an insertion part for use in an endoscope, including the front end structure of any of the above embodiments.

[0058] Please refer to Figures 1 to 9. This application also provides an endoscope, including an operating handle 500 and an insertion part of the above-described scheme, wherein the operating handle 500 is located at the proximal end of the insertion part.

[0059] The endoscope has the same or corresponding technical features as the aforementioned insertion part and can achieve the same or corresponding technical effects. Furthermore, the endoscope in this application embodiment can be a bronchoscope, pyeloscope, esophagoscope, gastroscope, colonoscope, otoscope, rhinoscope, oral endoscope, laryngoscope, colposcope, laparoscope, arthroscope, etc. This application embodiment does not specifically limit the type of endoscope.

[0060] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A front-end structure applied to the insertion part of an endoscope, characterized in that, include: The front housing (100) has a mounting hole (110) on its far end face. The camera module (200) is installed in the mounting hole (110), and the installed camera module (200) forms an accommodating gap (120) with the far end opening of the mounting hole (110). A transparent optical disc (300) is movably disposed within the accommodating gap (120). The transparent optical disc (300) has a rotating part (310), and multiple rotating parts (310) are evenly distributed circumferentially on the near end surface of the transparent optical disc (300). The water spray component (400) includes a spray section (410) and a flow section (420). The spray section (410) is disposed on the front end housing (100) and has a spray nozzle (411) facing the distal end face of the transparent optical disc (300). The flow section (420) is located within the front housing (100) and communicates with the spray section (410). It allows flushing fluid to enter from the proximal end of the endoscope and flow into the spray section (410), so that the flushing fluid is sprayed through the spray nozzle (411) onto the distal surface of the transmissive disc (300). The outer peripheral wall of the camera module (200) and the inner peripheral wall of the mounting hole (110) form an annular gap (130). The rotating part (310) extends into the annular gap (130), and the annular gap (130) partially coincides with the flow path of the flushing liquid in the flow section (420), so that the transparent disc (300) rotates circumferentially within the accommodating gap (120) under the action of the flushing liquid.

2. The front-end structure according to claim 1, characterized in that, The circulation section (420) has at least a first circulation segment (421), a second circulation segment (422), and a third circulation segment (423) connected in sequence, wherein, The distal end of the first flow section (421) is connected to the jet section (410), the proximal end of the third flow section (423) is connected to the endoscope operating handle (500) via the insertion section, and the flow path of the flushing fluid in the second flow section (422) partially overlaps with the annular gap (130).

3. The front-end structure according to claim 2, characterized in that, The extension path of the second flow section (422) is tangential to the outer periphery of the annular gap (130) so that the flushing fluid flowing in the second flow section (422) applies a tangential thrust to the rotating part (310).

4. A front-end structure according to claim 2, characterized in that, The rotating part (310) extends away from the transparent disc (300) into the second flow section (422) and is located in the flow path of the rinsing liquid. Alternatively, the proximal opening of the third flow section (423) is tilted toward the annular gap (130).

5. A front-end structure according to claim 2, characterized in that, The rotating part (310) extends obliquely from the distal end to the proximal end; And / or, when the rotating part (310) is close to the second flow section (422), the angle formed by the extension path of the rotating part (310) and the flow path of the flushing liquid in the second flow section (422) in the direction from the distal end to the proximal end is an acute angle.

6. A front-end structure according to claim 1, characterized in that, The front housing (100) has a limiting seal (140) which is circumferentially embedded in the distal opening edge of the mounting hole (110).

7. A front-end structure according to any one of claims 1-6, characterized in that, The spraying part (410) protrudes from the far end of the front housing (100) and is located on one side of the mounting hole (110); The axial extension path of the jet nozzle (411) intersects the distal surface of the transparent disc (300).

8. A front-end structure according to any one of claims 1-6, characterized in that, The distal end of the transparent optical disc (300) protrudes outward.

9. An insertion part for use in an endoscope, characterized in that, Includes the front-end structure as described in any one of claims 1-8.

10. An endoscope, characterized in that, It includes an operating handle (500) and an insertion part as described in claim 8, wherein the operating handle (500) is located at the proximal end of the insertion part.

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