Endoscope and its front end assembly and insertion part

Abstract

The present application belongs to the field of medical device technology, and specifically relates to an endoscope and its front-end assembly and insertion part. The front-end assembly includes a front-end seat, an instrument tube and a driving member. The front-end seat has a camera module installation position, the instrument tube is inserted into the front-end seat and is located on the proximal side of the camera module installation position, and the camera module installation position and the instrument tube are arranged oppositely in the axial direction of the front-end seat; the front-end seat is provided with an instrument port, and the instrument port and the distal end of the instrument tube are arranged oppositely in the radial direction of the front-end seat, and the driving member can drive the distal end of the instrument tube to bend toward the instrument port, so that the distal end opening of the instrument tube is directed toward the outside of the front-end seat with the aid of the instrument port. The camera module installation position and the instrument tube in the present application are arranged oppositely in the axial direction of the front-end seat. Compared with the staggered arrangement of the two in the axial direction, the present application can reduce the radial space in the front-end seat occupied by the camera module installation position and the instrument tube, so that the size of the front-end seat can be reduced, thereby facilitating the insertion part to smoothly reach the patient's lesion.

Description

Technical Field

[0001] The present application belongs to the technical field of medical devices, and specifically relates to an endoscope and a front end component and an insertion portion thereof. Background Art

[0002] With the continuous development of medical technology, endoscopes have been widely used in the diagnosis and treatment of diseases. When using an endoscope, the insertion part of the endoscope can be inserted into the patient's body, and the image information of the subject located on the inner wall of the tissue is obtained through the camera module arranged in the front end seat of the insertion part.

[0003] The distal end of the current insertion part is relatively large. When inserting the insertion part into a narrow cavity inside the human body, such as a bronchus, the insertion part is greatly obstructed. If the insertion is forced, it is easy to cause bleeding on the wall of the patient's cavity, which makes the patient's stress reaction stronger and makes it difficult to proceed with the operation, thus failing to achieve the treatment effect. Therefore, how to reduce the size of the distal end of the insertion part to facilitate the insertion part to smoothly reach the patient's lesion has become an urgent problem to be solved in this field. Summary of the invention

[0004] The purpose of the present application is to provide an endoscope and its front end assembly and insertion part, which can solve the problem of reducing the size of the front end seat at the distal end of the insertion tube to facilitate the insertion part to smoothly reach the patient's lesion.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] In a first aspect, the present application provides a front end assembly of an endoscope, including a front end seat, an instrument tube and a driving member, wherein a camera module mounting position is provided in the front end seat, the instrument tube is passed through the front end seat and is located proximal to the camera module mounting position, and the camera module mounting position and the instrument tube are arranged opposite to each other in the axial direction of the front end seat;

[0007] An instrument port is provided on the front end seat, and the instrument port and the distal end of the instrument tube are arranged opposite to each other in the radial direction of the front end seat. The driving member can drive the distal end of the instrument tube to bend toward the instrument port so that the distal end opening of the instrument tube faces the outside of the front end seat with the aid of the instrument port.

[0008] In a second aspect, the present application provides an insertion portion of an endoscope, comprising the above-mentioned front end assembly.

[0009] In a third aspect, the present application provides an endoscope comprising the above-mentioned insertion portion.

[0010] The beneficial technical effects of this application are as follows:

[0011] The camera module mounting position and the instrument tube in the present application are arranged relative to each other in the axial direction of the front end seat. Compared with the axially staggered arrangement of the two, the present application can reduce the radial space in the front end seat jointly occupied by the camera module mounting position and the instrument tube, thereby reducing the size of the front end seat, thereby facilitating the insertion part to smoothly reach the patient's lesion.

[0012] The present application controls the bending of the instrument tube so that the distal opening of the instrument tube faces the outside of the front end seat, and the instrument tube will not be axially compressed during the bending process. Therefore, compared with the related art, the present application can easily make the distal opening of the instrument tube face the outside of the front end seat to allow the medical device to enter the human body normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the structure of the front-end component disclosed in the embodiment of the present application in the first state;

[0014] Figure 2 An exploded schematic diagram of a front-end assembly disclosed in an embodiment of the present application in a first state;

[0015] Figure 3 A cross-sectional view of a portion of the structure of the front end assembly disclosed in an embodiment of the present application in a first state;

[0016] Figure 4 A schematic diagram of the structure of the front-end component disclosed in an embodiment of the present application in the second state;

[0017] Figure 5 An exploded schematic diagram of the front-end assembly disclosed in an embodiment of the present application in a second state;

[0018] Figure 6 For this application Figure 5 The enlarged schematic diagram of point A in the middle;

[0019] Figure 7 This is a schematic diagram of the partial structure of the front-end component disclosed in an embodiment of the present application in a first state.

[0020] Description of reference numerals:

[0021] 100, front end seat; 110, instrument port; 120, guide surface; 130, avoidance groove; 140, first threading hole; 200, instrument tube; 210, rigid part; 300, driving member; 310, sleeve part; 400, shielding member; 410, first part; 420, second part; 430, fixing ring; 500, camera module. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0023] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0024] The endoscope and its front end assembly and insertion portion provided in the embodiments of the present application are described in detail below through specific embodiments and their application scenarios in combination with the accompanying drawings.

[0025] In each embodiment of the present application, "proximal end" and "distal end" refer to the position of the endoscope and its components relative to the user in the use environment, wherein the end closer to the user is designated as the "proximal end" and the end farther from the user is designated as the "distal end".

[0026] The distal end of the current insertion portion is provided with a front end seat, in which a camera module and an instrument tube are arranged. The inventor has found that the camera module and the instrument tube in the current front end seat are offset in the axial direction of the front end seat, which will cause the two to occupy a larger radial space in the front end seat. Obviously, this will increase the size of the front end seat, which is not conducive to the insertion portion to smoothly reach the patient's lesion.

[0027] In order to solve this problem, the related technology WO2023241134A1 sets a guide path in the front end seat, and the guide path includes a first guide section, a second guide section and a transition section. The transition section is located between the first guide section and the second guide section, and the transition section is an inclined section formed between the first guide section and the second guide section. The distal end of the first guide section is limited to the distal end surface of the distal shell, the first guide section is an elastic contraction section, the second guide section is arranged opposite to the camera module, and the instrument tube is located in the second guide section. In this case, the instrument tube and the camera module are arranged opposite to each other, thereby reducing the radial space occupied by the instrument tube and the camera module in the front end seat.

[0028] However, the inventors further discovered that, in the process of the related technology instrument tube moving forward from the second guide section through the transition section to the first guide section, the transition section will exert an axial reaction force on the instrument tube, and the rigidity of the instrument tube itself is relatively small. Therefore, the instrument tube is likely to be axially compressed to be wavy and thus unable to enter the first guide section. In this case, the distal opening of the instrument tube cannot face the outside of the front end seat, which will prevent the medical device from entering the human body normally.

[0029] like Figures 1 to 7 As shown, an embodiment of the present application discloses a front end assembly of an endoscope, including a front end seat 100, an instrument tube 200 and a driving member 300. The front end seat 100 has a camera module mounting position, wherein the camera module mounting position is used to install a camera module 500. The instrument tube 200 is passed through the front end seat 100 and is located proximal to the camera module mounting position. The camera module mounting position and the instrument tube 200 are arranged relative to each other in the axial direction of the front end seat 100, that is, at least a portion of the camera module mounting position is arranged relative to the instrument tube 200 in the axial direction.

[0030] The front end seat 100 is provided with an instrument opening 110, and the instrument opening 110 and the distal end of the instrument tube 200 are arranged opposite to each other in the radial direction of the front end seat 100. The driving member 300 can drive the distal end of the instrument tube 200 to bend toward the instrument opening 110, so that the distal opening of the instrument tube 200 is directed toward the outside of the front end seat 100 with the aid of the instrument opening 110, that is, the medical instrument can be extended from the distal opening of the instrument tube 200 to the outside of the front end seat 100 to enter the target position in the human body.

[0031] The camera module mounting position and the instrument tube 200 in the present application are arranged relative to each other in the axial direction of the front end seat 100. Compared with the axially staggered arrangement of the two, the present application can reduce the radial space in the front end seat 100 jointly occupied by the camera module mounting position and the instrument tube 200, thereby reducing the size of the front end seat 100, thereby facilitating the insertion part to smoothly reach the patient's lesion.

[0032] In addition, since the distal opening of the instrument tube 200 faces the camera module installation position, and the camera module installation position is to be equipped with the camera module 500, the medical device cannot be inserted into the target position in the human body from the distal opening of the instrument tube 200. Therefore, the present application sets an instrument port 110 on one side of the front end seat 100 located in the radial direction of the instrument tube 200, and uses the driving member 300 to drive the distal end of the instrument tube 200 to bend toward the instrument port 110, so that the distal opening of the instrument tube 200 is set correspondingly to the instrument port 110. The corresponding setting here can make the distal end of the instrument tube 200 extend into / extend out of the instrument port 110; or the distal end of the instrument tube 200 does not extend into the instrument port 110, and the distal opening of the instrument tube 200 faces the instrument port 110, so that the purpose of "the distal opening of the instrument tube 200 faces the outside of the front end seat 100 with the aid of the instrument port 110" can be achieved.

[0033] It should be noted that the present application controls the bending of the instrument tube 200 so that the distal opening of the instrument tube 200 faces the outside of the front end seat 100, and the instrument tube 200 will not be axially compressed during the bending process. Therefore, compared with the related art, the present application can easily make the distal opening of the instrument tube 200 face the outside of the front end seat 100, so that the medical device can enter the human body normally.

[0034] Since an instrument port 110 is opened on the side of the front end seat 100, the instrument port 110 will expose the components inside the front end seat 100. In other words, the sealing performance of the front end seat 100 is poor, and the components inside the front end seat 100 may be easily contaminated during the process of inserting the endoscope, which will not only increase the risk of cross infection, but also may affect the service life and performance of the endoscope.

[0035] In an optional embodiment, the front end assembly also includes a shielding member 400, which is an elastic structural member. The shielding member 400 is connected to the front end seat 100 and covers the instrument port 110. When the distal end of the instrument tube 200 is bent toward the instrument port 110, the instrument tube 200 can squeeze and open the shielding member 400 so that the distal end opening of the instrument tube 200 faces the outside of the front end seat 100.

[0036] In this embodiment, the shielding member 400 covers and seals the instrument opening 110, that is, the components in the front end seat 100 are shielded by the shielding member 400, and the components are not exposed through the instrument opening 110, thereby preventing the components in the front end seat 100 from being contaminated. In addition, when the instrument tube 200 is bent toward the instrument opening 110, the instrument tube 200 can squeeze the shielding member 400, and the shielding member 400 will deform when squeezed to be in an open state. At this time, at least part of the shielding member 400 releases the seal on the instrument opening 110, and the distal opening of the instrument tube 200 can be directed to the outside of the front end seat 100 through the unsealed part of the instrument opening 110.

[0037] It should be noted that when the structure of this embodiment is adopted, the shielding member 400 is opened only when the endoscope is advanced. During the endoscope advancement process, the shielding member 400 does not open the instrument port 110. In other words, the shielding member 400 is opened for a shorter time. Therefore, compared with when the instrument port 110 is in the normally open state, the risk of contamination of the components in the front end seat 100 of this embodiment is smaller; and even after the shielding member 400 opens the instrument port 110, the shielding member 400 can still prevent contaminants from entering the instrument port 110 from the radial direction, so as to reduce the risk of contamination of the components in the front end seat 100.

[0038] In the process of the distal end of the instrument tube 200 being deformed toward the instrument port 110 to open the shielding member 400, the shielding member 400 will also deform outward along with the distal end of the instrument port 110. If the outward angle of the shielding member 400 is consistent, the axial direction of the distal opening of the instrument tube 200 is inclined relative to the axis of the front end seat 100, and the extension direction of the medical device from the distal opening of the instrument tube 200 is also inclined relative to the axis of the front end seat 100. This will cause the medical device to move too far radially away from the front end seat 100, causing the edge of the observation range of the camera module 500 located in the front end seat 100 to be even outside the observation range, which is not conducive to the performance of the operation.

[0039] Therefore, in an optional embodiment, the shielding member 400 includes a first portion 410 and a second portion 420, the first portion 410 is located on the distal side of the second portion 420, the proximal end of the second portion 420 is connected to the front end seat 100, and the first portion 410 is bent inward relative to the second portion 420, where the inside and outside refer to the inside and outside of the front end seat 100, that is, the first portion 410 is closer to the axis of the front end seat 100 than the second portion 420, and in the direction extending from the proximal end to the distal end of the front end seat 100, the distance between the first portion 410 and the axis of the front end seat 100 gradually decreases.

[0040] The force application point of the driving member 300 on the instrument tube 200 is set at a preset distance from the distal opening of the instrument tube 200. The preset distance here can be selected according to actual conditions, as long as the portion of the instrument tube 200 located distal to the force application point can be bent by the first part 410. When the instrument tube 200 squeezes the shielding member 400, the first part 410 can make the distal opening of the instrument tube 200 face the distal side of the front end seat 100.

[0041] In this embodiment, the first portion 410 is bent inward relative to the second portion 420, so after the shielding member 400 deforms outward following the distal end of the instrument port 110, the outward angle of the shielding member 400 is inconsistent, and the angle between the first portion 410 and the axis of the instrument tube 200 is smaller than the angle between the second portion 420 and the axis of the instrument tube 200. A force is generated between the distal end of the instrument tube 200 and the shielding member 400, and the instrument tube 200 will adapt to the shape of the shielding member 400, that is, the shape of the distal end of the instrument tube 200 will match the shape of the shielding member 400, so the angle between the second portion 420 and the axis of the instrument tube 200 is small, which will make the angle between the axis of the distal end opening of the instrument tube 200 and the axis of the instrument tube 200 small, so that the distance of the medical device radially away from the front end seat 100 can be reduced, so that it is located in the middle of the observation range of the camera module 500 in the front end seat 100, so as to facilitate the operation.

[0042] For example, when the distal opening of the instrument tube 200 faces the outside of the front end seat 100 , the axis of the distal opening of the instrument tube 200 may be parallel to the axis of the front end seat 100 .

[0043] In an optional embodiment, the shielding member 400 covers the outer surface of the front end seat 100, and the distal end of the front end seat 100 has a guide surface 120. In the direction extending from the proximal end to the distal end of the front end seat 100, the distance between the guide surface 120 and the axis of the front end seat 100 gradually decreases, a portion of the instrument port 110 is located on the guide surface 120, and the first portion 410 is in contact with the guide surface 120.

[0044] In this embodiment, the distal end of the front end seat 100 has a guide surface 120, and the distance between the guide surface 120 and the axis of the front end seat 100 gradually decreases in the direction extending from the proximal end to the distal end of the front end seat 100, which can make the distal end of the front end seat 100 have a smaller size, thereby facilitating the insertion of the front end seat 100 into the human body.

[0045] In an optional embodiment, a portion of the guide surface 120 is sunken to form an avoidance groove 130 , which is connected to the instrument port 110 . When the instrument tube 200 squeezes the shielding member 400 , a portion of the distal opening of the instrument tube 200 faces the avoidance groove 130 .

[0046] In this embodiment, when the distal opening of the instrument tube 200 faces the distal side of the front end seat 100, a portion of the distal opening of the instrument tube 200 will face the avoidance groove 130, and the avoidance groove 130 will serve as a passage for the medical instrument to pass through, and the avoidance groove 130 is recessed in the guide surface 120. That is to say, this embodiment uses the front end seat 100 itself as a passage for the medical instrument to pass through, which can not only reduce the radial movement stroke of the instrument tube 200, thereby reducing the difficulty of the driving member 300 driving the distal end of the instrument tube 200 toward the outside of the front end seat 100; it can also reduce the size of the instrument tube 200 radially protruding from the front end seat 100 when the distal opening of the instrument tube 200 faces the outside of the front end seat 100, so that the front end component can perform surgery when encountering a relatively narrow cavity.

[0047] In an optional embodiment, the thickness of the first part 410 is greater than the thickness of the second part 420, which can make the stiffness of the first part 410 greater than the stiffness of the second part 420, thereby reducing the deformation of the first part 410 toward the outer shape, so as to further reduce the radial distance of the medical device away from the front end seat 100, making it closer to the middle of the observation range of the camera module 500 in the front end seat 100, so as to facilitate the operation.

[0048] And / or, when the distal end of the instrument tube 200 is bent toward the instrument port 110, the distal opening of the instrument tube 200 will first contact the shielding member 400, and the distal opening of the instrument tube 200 will be subjected to a large force. In order to prevent the distal opening of the instrument tube 200 from collapsing and deforming when subjected to a large force, this will reduce the passing performance of the instrument tube 200.

[0049] Therefore, in an optional embodiment, the tube section of the instrument tube 200 near its distal opening has a rigid portion 210. For example, a rigid ring such as an iron ring can be set at the distal end of the instrument tube 200 to form the rigid portion 210. The rigidity of the rigid portion 210 is greater than the rigidity of other parts of the instrument tube 200. The rigid portion 210 corresponds to the first portion 410 and can squeeze the first portion 410.

[0050] In this embodiment, the tube section of the instrument tube 200 near its distal opening has a rigid portion 210, and the rigid portion 210 has a relatively large rigidity, so even if the tube section of the instrument tube 200 near its distal opening is subjected to a relatively large force, it is not easy to collapse and deform, thereby ensuring the passing performance of the instrument tube 200. Of course, the rigidity of each part of the rigid portion 210 may also be kept consistent, and this application does not limit this.

[0051] The inventors have discovered that the current front end seat 100 is only provided with an instrument opening 110, through which the lithotripsy tool extends to break up the stones in the target area. The position of the instrument opening 110 on the front end seat 100 is fixed, and it can only provide an extension angle and direction for the lithotripsy tool. Therefore, the lithotripsy tool can cover a smaller area, and therefore cannot effectively break up or remove stones outside the coverage range, resulting in a low stone removal rate.

[0052] In an optional embodiment, there are two instrument ports 110 , which are respectively located on both sides of the front end seat 100 along its own radial direction, and the driving member 300 can drive the distal end of the instrument tube 200 to bend toward any one of the instrument ports 110 .

[0053] In this embodiment, two instrument ports 110 are provided on the front end seat 100. The two instrument ports 110 can provide two different extension angles and directions for the medical device, so that the medical device can be flexibly extended into various areas of the human body, thereby increasing the coverage area of ​​the medical device, that is, medical devices such as lithotripsy can reach more areas in the human body, thereby solving the problem that stones cannot be effectively crushed or removed and the stone removal rate is low.

[0054] It should be noted that when this embodiment is combined with the embodiment of "the shielding member 400 includes a first portion 410 and a second portion 420", the number of the first portion 410 and the second portion 420 is two, so as to respectively cover the two instrument ports 110. Further, the shielding member 400 also includes a fixing ring 430, and the two second portions 420 are both connected to the fixing ring 430, and the fixing ring 430 is sleeved and fixed on the front end seat 100, and at this time, the second portion 420 is indirectly connected to the front end seat 100 through the fixing ring 430.

[0055] And / or, in an optional embodiment, the driving member 300 includes a driving rope, the distal end of which is sleeved on the outside of the distal end of the instrument tube 200, and when the proximal end of the driving rope is pulled, the distal end of the instrument tube 200 bends toward the instrument port 110. In this embodiment, the distal end of the driving rope is sleeved on the outside of the front end seat 100, which can increase the contact area between the driving rope and the distal end of the instrument tube 200, so that the instrument tube 200 can be better deformed in a preset direction.

[0056] It should be noted that when this embodiment is combined with the embodiment in which “the number of instrument ports 110 is two”, the number of drive ropes is also two, and the two drive ropes respectively control the distal end of the instrument tube 200 to bend toward the two instrument ports 110 respectively.

[0057] In an optional embodiment, a loop portion 310 is formed at the distal end of the drive rope, and the loop portion 310 is sleeved on the outside of the front end seat 100. The front end seat 100 is provided with a first threading hole 140 and a second threading hole. The first threading hole 140 and the second threading hole are respectively located on two opposite sides of the front end seat 100, and the two sides of the loop portion 310 are respectively passed through the first threading hole 140 and the second threading hole.

[0058] In this embodiment, the two sides of the sleeve portion 310 are respectively penetrated by the first threading hole 140 and the second threading hole, and the first threading hole 140 and the second threading hole can provide a guide for the sleeve portion 310, so that the sleeve portion 310 slides on a preset path, and the first threading hole 140 and the second threading hole can limit the sleeve portion 310 in the axial direction, which can prevent the sleeve portion 310 from slipping in the axial direction relative to the instrument tube 200. In addition, the hole edges of the first threading hole 140 and the second threading hole can also limit the sleeve portion 310, which can prevent the instrument port 110 from moving too far toward the outside of the front end seat 100.

[0059] When this embodiment is combined with the embodiment of "the number of instrument ports 110 is two", the number of the first threading hole 140 and the second threading hole are both two, so as to provide guidance for the two drive ropes respectively, and when the proximal end of one of the drive ropes is stretched taut, the other traction rope is in a relaxed state.

[0060] The embodiment of the present application also discloses an insertion portion of an endoscope, including a front end assembly as described in any of the above embodiments, so that the insertion portion has the beneficial effects of the above front end assembly, which will not be repeated here.

[0061] The present application also discloses an endoscope, including the above-mentioned insertion portion. The endoscope referred to in the present application can be a bronchoscope, a pyeloscope, an esophagoscope, a gastroscope, an enteroscope, an otoscope, a rhinoscope, a stomatoscope, a laryngoscope, a colposcope, a laparoscope, an arthroscope, etc. The present application does not specifically limit the type of the endoscope.

[0062] The above embodiments of the present application focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here. The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the present application, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present application and the claims, all of which are within the protection of the present application.

Claims

1. A front end assembly of an endoscope, characterized in that: The device comprises a front end seat (100), an instrument tube (200) and a driving member (300); the front end seat (100) has a camera module installation position in it; the instrument tube (200) is inserted into the front end seat (100) and is located near the camera module installation position; the camera module installation position and the instrument tube (200) are arranged opposite to each other in the axial direction of the front end seat (100); The front end seat (100) is provided with an instrument opening (110), the instrument opening (110) and the distal end of the instrument tube (200) are arranged opposite to each other in the radial direction of the front end seat (100), and the driving member (300) is capable of driving the distal end of the instrument tube (200) to bend toward the instrument opening (110), so that the distal end opening of the instrument tube (200) is directed toward the outside of the front end seat (100) by means of the instrument opening (110); The front end assembly further comprises a shielding member (400), wherein the shielding member (400) is an elastic structural member, and the shielding member (400) is connected to the front end seat (100) and covers the instrument port (110); When the distal end of the instrument tube (200) is bent toward the instrument port (110), the instrument tube (200) can squeeze and open the shielding member (400) so that the distal end opening of the instrument tube (200) faces the outside of the front end seat (100); The shielding member (400) comprises a first portion (410) and a second portion (420), the first portion (410) being located at the distal side of the second portion (420), the proximal end of the second portion (420) being connected to the front end seat (100), and the first portion (410) being bent inwardly relative to the second portion (420); The force application point of the driving member (300) on the instrument tube (200) is arranged at a preset distance from the distal opening of the instrument tube (200), and when the instrument tube (200) presses the shielding member (400), the first part (410) can make the distal opening of the instrument tube (200) face the distal side of the front end seat (100).

2. The front end assembly according to claim 1, characterized in that: The shielding member (400) covers the outer surface of the front end seat (100); the distal end of the front end seat (100) has a guide surface (120); in a direction extending from the proximal end to the distal end of the front end seat (100), the distance between the guide surface (120) and the axis of the front end seat (100) gradually decreases; a portion of the instrument port (110) is located on the guide surface (120), and the first portion (410) is in contact with the guide surface (120).

3. The front end assembly according to claim 2, characterized in that: A partial area of ​​the guide surface (120) is sunken to form an avoidance groove (130), the avoidance groove (130) being connected to the instrument port (110), and when the instrument tube (200) squeezes the shielding member (400), a portion of the distal opening of the instrument tube (200) faces the avoidance groove (130).

4. The front end assembly according to claim 1, characterized in that: The thickness of the first portion (410) is greater than the thickness of the second portion (420); and / or, The tube section of the instrument tube (200) close to its distal opening has a rigid portion (210), the rigidity of the rigid portion (210) is greater than the rigidity of other portions of the instrument tube (200), and the rigid portion (210) corresponds to the first portion (410) and is capable of squeezing the first portion (410).

5. The front end assembly according to any one of claims 1 to 4, characterized in that: The number of the instrument ports (110) is two, the two instrument ports (110) are respectively located on both sides of the front end seat (100) along its own radial direction, and the driving member (300) is capable of driving the distal end of the instrument tube (200) to bend toward any one of the instrument ports (110); and / or, The driving member (300) comprises a driving rope, the distal end of which is sleeved outside the distal end of the instrument tube (200), and when the proximal end of the driving rope is pulled, the distal end of the instrument tube (200) bends toward the instrument port (110).

6. The front end assembly according to claim 5, characterized in that The distal end of the driving rope forms a looping portion (310), and the looping portion (310) is looped on the outside of the front end seat (100). The front end seat (100) is provided with a first threading hole (140) and a second threading hole. The first threading hole (140) and the second threading hole are respectively located on two opposite sides of the front end seat (100), and the two sides of the looping portion (310) are respectively penetrated in the first threading hole (140) and the second threading hole.

7. An insertion portion of an endoscope, characterized in that: Comprising a front end assembly as claimed in any one of claims 1 to 6.

8. An endoscope, characterized in that: Comprising the insert portion as claimed in claim 7.

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