Endoscope and front end assembly thereof
By setting two instrument ports on the endoscope tip assembly and switching the position of the instrument tube, the problem of limited coverage area of the lithotripsy tool was solved, and the stone removal rate was improved.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- HUNAN VATHIN MEDICAL INSTR CO LTD
- Filing Date
- 2025-11-19
- Publication Date
- 2026-06-04
AI Technical Summary
The lithotripsy tools in existing endoscopes have limited coverage areas, resulting in low stone removal rates.
The endoscope's front end assembly has two instrument ports, and the instrument tube can be switched in different positions, providing two different extension angles and directions to increase the coverage area of the medical device.
The design with two instrument ports increases the area covered by the medical device inside the body, thereby improving the stone removal rate.
Smart Images
Figure CN2025136026_04062026_PF_FP_ABST
Abstract
Description
Endoscope and its front-end components Technical Field
[0001] This application belongs to the field of medical device technology, specifically relating to an endoscope and its front-end components. Background Technology
[0002] Endoscopes are typically used to diagnose and treat lesions within a patient's body. An endoscope consists of a handle and an insertion section. During operation, by controlling the handle, the active bending segment at the distal end of the insertion section can be pulled via a traction cable to achieve bending motion, thereby changing the orientation of the distal end of the insertion section.
[0003] When removing kidney stones using an endoscope and guide sheath, a guide wire is used to insert the sheath into the kidney, and then the insertion part of the endoscope is inserted into the sheath. The lithotripsy tool is then inserted into the kidney through the instrument channel within the insertion part to break up the stone. However, in practice, the lithotripsy tool has a limited coverage area, which means some stones may not be effectively broken up or removed, thus reducing the stone removal rate. Summary of the Invention
[0004] The purpose of this application is to provide an endoscope and its front-end component, which can help solve the problem that current medical devices such as lithotripters can only reach a limited area inside the human body.
[0005] To solve the above-mentioned technical problems, this application is implemented as follows:
[0006] This application provides a front end component of an endoscope, including a front end seat and an instrument tube. The front end seat has a receiving space, and a first instrument port and a second instrument port are provided on the front end seat at intervals. Both the first instrument port and the second instrument port are connected to the receiving space, and the distal end of the instrument tube extends into the receiving space.
[0007] The instrument tube is movable relative to the front end seat to switch between a first position and a second position. When the instrument tube is in the first position, a first instrument passage is formed between the proximal opening of the instrument tube and the first instrument port. When the instrument tube is in the second position, a second instrument passage is formed between the proximal opening of the instrument tube and the second instrument port.
[0008] This application also provides an endoscope including the aforementioned front-end component.
[0009] The beneficial technical effects of this application are as follows:
[0010] This application provides two different extension angles and directions for the medical device through the first and second instrument ports, thereby allowing the medical device to flexibly extend into various areas of the human body, increasing the coverage area of the medical device. In other words, medical devices such as lithotripters can reach more areas inside the human body, thus solving the problem in related technologies that stones cannot be effectively broken up or removed, and that the stone removal rate is low. Attached Figure Description
[0011] Figure 1 is a schematic diagram of the structure of the front-end component according to an embodiment of this application;
[0012] Figure 2 is a cross-sectional view of the front end component of the instrument tube in the first position according to an embodiment of this application;
[0013] Figure 3 is a cross-sectional view of the front end component of the instrument tube in the second position according to an embodiment of this application;
[0014] Figure 4 is a cross-sectional view of the front end component of the instrument tube in the third position according to an embodiment of this application;
[0015] Figure 5 is a schematic diagram of the front-end mount according to an embodiment of this application.
[0016] Explanation of reference numerals in the attached figures:
[0017] 100, front end seat; 101, first instrument port; 102, second instrument port; 103, first guide surface; 104, second guide surface; 110, receiving space; 111, restraint channel; 120, first limiting part; 130, second limiting part; 140, seat body; 150, restraint tube; 200, instrument tube; 300, elastic element. Detailed Implementation
[0018] In this application, "proximal" and "distal" refer to the end of the endoscope and its components relative to the user's position in the usage environment, with the end closer to the user being designated as "proximal" and the end farther from the user being designated as "distal".
[0019] The inventors discovered that the current front end only has one instrument port, through which the lithotripsy tool extends to break up stones in the target area. The position of the instrument port on the front end is fixed, which can only provide an extension angle and direction for the lithotripsy tool. Therefore, the area that the lithotripsy tool can cover is small, and it cannot effectively break up or remove stones outside the coverage area, resulting in a low stone removal rate.
[0020] As shown in Figures 1 to 5, this application discloses a front-end component of an endoscope, including a front-end base 100 and an instrument tube 200. The front-end base 100 has a receiving space 110, and a first instrument port 101 and a second instrument port 102 are spaced apart on the front-end base 100. Both the first instrument port 101 and the second instrument port 102 are connected to the receiving space 110. The distal end of the instrument tube 200 extends into the receiving space 110. Specifically, the front-end base 100 is located at the distal end of the insertion part. The front-end base 100 may have a camera module mounting position for mounting a camera module, through which lesions can be observed. The first instrument port 101 and the second instrument port 102 are located on the outer surface of the camera module. The instrument tube 200 is used to insert medical instruments such as biopsy forceps, snares, and lithotripters, and liquids can also be injected into the human body through the instrument tube 200.
[0021] It should be noted that the front end 100 of this application can be installed at the distal end of the active bending section of the endoscope, and the active bending section can bend to drive the front end 100 to swing. Here, the first instrument port 101 and the second instrument port 102 can be located on both sides of the front end 100 along its own swing direction, and the first instrument port 101 and the second instrument port 102 can be arranged relative to each other or offset.
[0022] The instrument tube 200 is movable relative to the front end seat 100 to switch between a first position and a second position. When the instrument tube 200 is in the first position, a first instrument passage is formed between the proximal opening of the instrument tube 200 and the first instrument port 101. That is, a medical instrument inserted from the proximal opening of the instrument tube 200 can enter the first instrument passage and be guided by the first instrument passage to the first instrument port 101, so as to extend from the first instrument port 101 to perform the corresponding surgical operation. It should be noted that when the instrument tube 200 is in the first position, the medical instrument will only be guided by the first instrument passage to the first instrument port 101, and cannot be guided to the second instrument port 102.
[0023] When the instrument tube 200 is in the second position, a second instrument passage is formed between the proximal opening of the instrument tube 200 and the second instrument port 102. That is, a medical instrument inserted from the proximal opening of the instrument tube 200 can enter the second instrument passage and be guided by the second instrument passage to the second instrument port 102, so as to extend from the second instrument port 102 to perform the corresponding surgical operation. It should be noted that when the instrument tube 200 is in the second position, the medical instrument will only be guided by the second instrument passage to the second instrument port 102, and cannot be guided to the first instrument port 101.
[0024] The front end 100 is provided with a first instrument port 101 and a second instrument port 102. The instrument tube 200 can switch between a first position and a second position. In the first position, a first instrument passage is formed between the proximal opening of the instrument tube 200 and the first instrument port 101, allowing medical instruments such as lithotripters to pass through the instrument tube 200 through the first instrument port 101 for surgery. In the second position, a second instrument passage is formed between the proximal opening of the instrument tube 200 and the second instrument port 102, allowing medical instruments such as lithotripters to pass through the instrument tube 200 through the second instrument port 102 for surgery. This application provides two different extension angles and directions for the medical instrument through the first instrument port 101 and the second instrument port 102, allowing the medical instrument to flexibly extend into various areas of the human body, thereby increasing the coverage area of the medical instrument. That is, medical instruments such as lithotripters can reach more areas inside the human body, thus solving the problem of stones not being effectively broken up or removed and the low stone removal rate in related technologies.
[0025] In some embodiments, the instrument tube 200 may include a main tube, a first branch tube, a second branch tube, a first opening and closing element, and a second opening and closing element. The distal end of the main tube extends into the receiving space 110. The first branch tube and the second branch tube are both connected to the distal end of the main tube. The first branch tube is correspondingly provided with the first instrument port 101, and the second branch tube is correspondingly provided with the second instrument port 102.
[0026] A first opening and closing element is provided at the first connection between the first branch pipe and the main pipe. The first opening and closing element can move relative to the front end seat 100 and can control the opening and closing of the first connection. A second opening and closing element is provided at the connection between the second branch pipe and the main pipe. The second opening and closing element can move relative to the front end seat 100 and can control the opening and closing of the second connection.
[0027] When the instrument tube 200 is in the first position, the first opening and closing element is in a conductive state, and the second opening and closing element is in a closed state. At this time, the main tube, the first branch tube, and the first instrument port 101 form the first instrument passage. The medical device cannot enter the second branch tube due to the obstruction of the second opening and closing element. Here, the second opening and closing element can also provide guidance for the medical device to enter the first branch tube. Similarly, when the instrument tube 200 is in the second position, the second opening and closing element is in a conductive state, and the first opening and closing element is in a closed state. At this time, the main tube, the second branch tube, and the second instrument port 102 form the second instrument passage. The medical device cannot enter the first branch tube due to the obstruction of the first opening and closing element. Here, the first opening and closing element can also provide guidance for the medical device to enter the second branch tube.
[0028] The previous embodiment improved the basic shape of the instrument tube 200 so that the instrument tube 200 has two outlets, which are respectively set to two instrument ports. Of course, other methods can also be used without changing the basic shape of the instrument tube 200 so that the instrument tube 200 still has only one outlet. In this case, a deformation memory alloy can be prefabricated at the distal end of the instrument tube 200 so that the distal end of the instrument tube 200 can swing, so as to achieve the purpose of setting the distal opening of the instrument tube 200 to correspond to the first instrument port 101 and the distal opening of the instrument tube 200 to correspond to the second instrument port 102.
[0029] Since a deformation memory alloy is prefabricated at the distal end of the instrument tube 200, an electric current is required to drive the distal end of the instrument tube 200 to swing. To simplify the structure of the instrument tube 200, in an optional embodiment, the instrument tube 200 has a first shape in which its distal end is bent. The instrument tube 200 in the first shape can rotate between a first position and a second position so that the distal opening of the instrument tube 200 corresponds to the first instrument port 101 or the second instrument port 102. For example, the correspondence between the distal opening of the instrument tube 200 and the first instrument port 101 can be: the distal opening of the instrument tube 200 extends into the first instrument port 101, or the distal opening of the instrument tube 200 does not extend into the first instrument port 101 but faces the first instrument port 101; the understanding of "the distal opening of the instrument tube 200 corresponds to the second instrument port 102" is the same, and will not be repeated here.
[0030] The instrument tube 200 has a first shape. In the first shape, the distal end of the instrument tube 200 is bent. Therefore, rotating the instrument tube 200 can change the orientation of the distal opening of the instrument tube 200, so that the instrument tube 200 can be set to correspond with the first instrument port 101 or the second instrument port 102. Please refer to Figures 2 and 3 for details. In this way, it is not necessary to change the shape of the instrument tube 200, nor is it necessary to integrate deformation memory alloy on the instrument tube 200, thereby simplifying the structure of the instrument tube 200.
[0031] To prevent the instrument tube 200 from rotating out of position, please refer to FIG5. In an optional embodiment, a first limiting part 120 is formed in the receiving space 110. When the instrument tube 200 rotates to the first position, the first limiting part 120 stops and limits the instrument tube 200.
[0032] During the rotation of the instrument tube 200 from the second position to the first position, the first limiting part 120 can stop and limit it, and when the instrument tube 200 is stopped and limited, it is exactly in the first position, so that the distal opening of the instrument tube 200 can be set to correspond with the first instrument port 101.
[0033] And / or, in an alternative embodiment, a second limiting portion 130 is formed in the receiving space 110, which stops and limits the instrument tube 200 when it is rotated to the second position.
[0034] During the rotation of the instrument tube 200 from the first position to the second position, the second limiting part 130 can stop and limit it, and when the instrument tube 200 is stopped and limited, it is exactly in the second position, so that the distal opening of the instrument tube 200 can be set to correspond with the second instrument port 102.
[0035] In certain endoscopic applications, the endoscope needs to be inserted into the ureter. Given the limited diameter of the ureter, the size of the endoscope insertion section is extremely thin, and engineers are continuously exploring methods to further reduce its size. However, while reducing the size of the insertion section, it is also necessary to ensure that the instrument tube 200 within the insertion section has a sufficiently large diameter. This is because, in endoscopic lithotripsy, after the stones are broken up using a holmium or thulium laser, water needs to be injected into the instrument tube 200 to mix with the broken stones in the renal calyces. The stones are then aspirated through the gap between the negative pressure suction sheath and the endoscope. To complete the surgery within a limited time, a certain water flow rate must be maintained to improve the stone removal efficiency. However, with a constant flow rate, when the diameter of the instrument tube 200 is small, the water jet velocity increases, which can impact the renal calyx tissue, causing damage and prolonging the patient's recovery period.
[0036] To reduce the risk of liquid sprayed from the instrument tube 200 damaging human tissue, in an optional embodiment, the instrument tube 200 can also be switched from a first position or a second position to a third position. When the instrument tube 200 is in the third position, the first part of the distal opening of the instrument tube 200 is correspondingly set with the first instrument port 101, and the second part of the distal opening of the instrument tube 200 is correspondingly set with the second instrument port 102.
[0037] When the instrument tube 200 is switched to the third position, the distal opening of the instrument tube 200 is simultaneously connected to the first instrument port 101 and the second instrument port 102. The liquid injected into the instrument tube 200 will flow out from the first instrument port 101 and the second instrument port 102. When the front seat 100 is provided with both the first instrument port 101 and the second instrument port 102, the flow area of the liquid is obviously greater than that when the front seat 100 is provided with only one instrument port. Under the condition of constant flow rate, the larger the flow area, the smaller the flow velocity. Therefore, this embodiment can reduce the speed at which the liquid is ejected from the front seat 100, thereby reducing the risk of liquid damaging human tissue.
[0038] It should be noted that when this embodiment is combined with the embodiment in which "the distal end of the instrument tube 200 is prefabricated with a deformation memory alloy so that the distal end of the instrument tube 200 can swing", the distal end of the instrument tube 200 can swing to the third position.
[0039] In addition, by adopting the technical solution that "the instrument tube 200 includes a main tube, a first branch tube, a second branch tube, a first opening and closing element, and a second opening and closing element", the instrument tube 200 can also be switched to a third position. In the third position, both the first opening and closing element and the second opening and closing element are in a conductive state. At this time, the distal opening of the instrument tube 200 includes the distal opening of the first branch tube and the distal opening of the second branch tube.
[0040] In one alternative embodiment, the distal end of the instrument tube 200 is elastic, and the instrument tube 200 is movable relative to the front end seat 100 along a first direction to switch from a first position or a second position to a third position, the first direction being the direction extending from the distal end to the proximal end of the front end seat 100.
[0041] In this embodiment, the instrument tube 200 can be moved from the first position or the second position to the third position by controlling the instrument tube 200 to move along the first direction. This makes switching the position of the instrument tube 200 simple and eliminates the need to set a deformation memory alloy at the far end of the instrument tube 200, which simplifies the structure of the instrument tube 200.
[0042] In some embodiments, the receiving space 110 includes a constraint track that extends circumferentially along the front end seat 100. The distal end of the instrument tube 200 extends into the constraint track and slides therewith. During the rotation of the instrument tube 200 between a first position and a second position, the constraint track can continuously constrain the instrument tube 200 to a first state of bending deformation. When the instrument tube 200 moves along a first direction and disengages from the constraint track, the instrument tube 200 returns to its natural state and is in a third position.
[0043] To simplify the structure of the front end 100, in an optional embodiment, the instrument tube 200 is in a first form and in a first position in its natural state, that is, the instrument tube 200 is pre-bent, and the receiving space 110 includes a constraint channel 111. When the instrument tube 200 is switched to a third position, the distal end of the instrument tube 200 is located in the constraint channel 111 and fits against the inner wall of the constraint channel 111, so as to be in a second form.
[0044] In this embodiment, the receiving space 110 includes a constraint channel 111. During the movement of the instrument tube 200 along the first direction, the distal end of the instrument tube 200 gradually enters the constraint channel 111 and is constrained by the inner wall of the constraint channel 111. The distal end of the instrument tube 200 automatically adapts to the shape of the constraint channel 111, causing the instrument tube 200 to undergo elastic deformation to a second shape. At this time, the distal opening of the instrument tube 200 is simultaneously connected to the first instrument port 101 and the second instrument port 102. Furthermore, the constraint channel 111 itself is part of the receiving space 110. The instrument tube 200 needs to enter the receiving space 110 through the constraint channel 111. Compared to setting a constraint track within the front end seat 100, this embodiment simplifies the structure of the front end seat 100.
[0045] Furthermore, the constraint channel 111 is straight, so that the second shape of the instrument tube 200 is straight. The first part of the constraint channel 111 is arranged opposite to the first instrument port 101, and the second part of the constraint channel 111 is arranged corresponding to the second instrument port 102.
[0046] Optionally, the front end seat 100 may include a seat body 140 and a constraint tube 150. The constraint tube 150 is inserted into the seat body 140, and the proximal end of the constraint tube 150 axially protrudes from the proximal end face of the seat body 140. The constraint channel 111 described above is formed within the constraint tube 150. Furthermore, in this embodiment combined with the embodiment where the elastic element 300 is an elastic sleeve, the distal end of the elastic sleeve is sleeved and fixed on the constraint tube 150, and the sleeved and fixed point between the proximal end of the elastic sleeve and the instrument tube 200 is located proximal to the constraint tube 150.
[0047] In an optional embodiment, the front end assembly further includes an elastic element 300, the two ends of which are connected to the instrument tube 200 and the front end seat 100, respectively. The elastic element 300 can drive the instrument tube 200 to move from the third position to the first position or the second position.
[0048] In this embodiment, during the process of applying a force in the first direction to the instrument tube 200 to control its movement along that direction, the elastic element 300 undergoes elastic deformation. Therefore, after releasing the instrument tube 200, the elastic element 300 recovers its elastic deformation, thereby applying a force in the opposite direction to the first direction to reset the instrument tube 200 from the third position to the first or second position. This simplifies the operation of the front-end assembly. Of course, besides using the elastic element 300, manual reset can also be used to move the elastic element 300 in the opposite direction to the first direction, thereby moving the instrument tube 200 from the third position to the first or second position.
[0049] It should be noted that there are two possible connection relationships between the elastic element 300 and the instrument tube 200: 1. The elastic element is in contact with the instrument tube, but the two are not fixed, and the instrument tube can rotate relative to the elastic element. During the rotation of the instrument tube, the elastic element will rotate relative to the elastic element. 2. The elastic element is fixedly connected to the instrument tube. In this case, the elastic element is torsion-resistant and will undergo torsional deformation during the rotation of the instrument, such as the elastic sleeve described below.
[0050] In an optional embodiment, when the instrument tube 200 is in the first position or the second position, the instrument tube 200 and the front end seat 100 are engaged in an upper limit engagement in the opposite direction of the first direction, and the elastic element 300 is in a deformed state.
[0051] When the instrument tube 200 is in the first or second position, the elastic element 300 is in a deformed state, thereby applying a force in the opposite direction of the first direction to the instrument tube 200, causing the instrument tube 200 to abut against the front end seat 100. In this way, when the instrument tube 200 moves to the third position, the deformation of the elastic element 300 will be greater, and the force applied by the elastic element 300 in the opposite direction of the first direction to the instrument tube 200 will be greater, thereby improving the reset effect of the instrument tube 200 and ensuring that the instrument tube 200 switches to the first or second position.
[0052] And / or, in an alternative embodiment, the elastic element 300 is an elastic sleeve that seals the gap between the instrument tube 200 and the front end seat 100.
[0053] Since the instrument tube 200 needs to aspirate intravenous fluid, the fluid is drawn in through the first instrument port 101 and / or the second instrument port 102. Some fluid may enter the gap between the instrument tube 200 and the endpiece 100, thus leaking outside the instrument tube 200. Since the instrument tube 200 is located within the active bending section of the endoscope, this fluid may corrode the active bending section. By designing the elastic element 300 as an elastic sleeve, the elastic sleeve can seal the gap between the instrument tube 200 and the endpiece 100, thereby preventing fluid from leaking outside the instrument tube 200 through the gap and solving the problem of fluid corrosion of the active bending section.
[0054] In one optional embodiment, the distal end of the front end seat 100 has a first guide surface 103 and a second guide surface 104. The first guide surface 103 and the second guide surface 104 are located on opposite sides of the front end seat 100 and are both in contact with the distal end surface of the front end seat 100. A first instrument port 101 is provided on the first guide surface 103 and a second instrument port 102 is provided on the second guide surface 104. The distance between the first guide surface 103 and the second guide surface 104 gradually decreases along the direction extending from the proximal end to the distal end of the front end seat 100.
[0055] In this embodiment, the distal end of the front end seat 100 has a first guide surface 103 and a second guide surface 104. The distance between the first guide surface 103 and the second guide surface 104 gradually decreases along the direction extending from the proximal end to the distal end of the front end seat 100. This allows the distal end of the front end seat 100 to have a smaller size, thereby facilitating the insertion of the front end seat 100 into the human body. Furthermore, the reduced distance between the first guide surface 103 and the second guide surface 104 causes at least one of them to be tilted relative to the axis of the front end seat 100. This results in the first guide surface 103 and / or the second guide surface 104 having a larger area, thereby increasing the area of the first instrument port 101 and / or the second instrument port 102. This reduces the flow rate of the liquid ejected from the instrument tube 200, thus reducing the risk of liquid damaging the inner wall of the tissue. Of course, the first instrument port 101 and the second instrument port 102 can also be located on the distal surface of the front end seat 100; this application does not limit this.
[0056] Both the first guide surface 103 and the second guide surface 104 can be inclined relative to the axial direction of the front end seat 100, which can further reduce the distal dimension of the front end seat 100. Here, the first guide surface 103 can be a slope, an arc surface, etc., and the second guide surface 104 can also be a slope, an arc surface, etc.
[0057] This application also discloses an endoscope including the front end component described in any of the above embodiments, thus enabling the endoscope to possess the beneficial effects of the aforementioned front end component, which will not be elaborated further here.
Claims
1. A front-end component of an endoscope, characterized in that, The device includes a front end (100) and an instrument tube (200). The front end (100) has a receiving space (110). The front end (100) has a first instrument port (101) and a second instrument port (102) spaced apart. The first instrument port (101) and the second instrument port (102) are both connected to the receiving space (110). The distal end of the instrument tube (200) extends into the receiving space (110). The instrument tube (200) is movable relative to the front end (100) to switch between a first position and a second position. When the instrument tube (200) is in the first position, a first instrument passage is formed between the proximal opening of the instrument tube (200) and the first instrument port (101); when the instrument tube (200) is in the second position, a second instrument passage is formed between the proximal opening of the instrument tube (200) and the second instrument port (102).
2. The front-end component according to claim 1, characterized in that, The instrument tube (200) has a first shape with its distal end bent. The instrument tube (200) in the first shape can rotate between the first position and the second position so that the distal opening of the instrument tube (200) is correspondingly set with the first instrument port (101) or the second instrument port (102).
3. The front-end component according to claim 2, characterized in that, A first limiting part (120) is formed within the receiving space (110), which, when the instrument tube (200) is rotated to the first position, stops and limits the instrument tube (200); and / or, A second limiting part (130) is formed in the accommodating space (110). When the instrument tube (200) is rotated to the second position, the second limiting part (130) stops and limits the instrument tube (200).
4. The front-end component according to claim 2, characterized in that, The instrument tube (200) can also be switched from the first position or the second position to the third position. When the instrument tube (200) is in the third position, the first part of the distal opening of the instrument tube (200) is correspondingly set to the first instrument port (101), and the second part of the distal opening of the instrument tube (200) is correspondingly set to the second instrument port (102).
5. The front-end component according to claim 4, characterized in that, The distal end of the instrument tube (200) is elastic and the instrument tube (200) is movable relative to the front end seat (100) in a first direction to switch from the first position or the second position to the third position. The first direction is the direction in which the instrument tube (200) extends from the distal end to the proximal end.
6. The front-end component according to claim 5, characterized in that, The instrument tube (200) is in the first form and located in the first position in its natural state. The receiving space (110) includes a constraint channel (111). When the instrument tube (200) is switched to the third position, the distal end of the instrument tube (200) is located in the constraint channel (111) and is in contact with the inner wall of the constraint channel (111) to be in the second form.
7. The front-end component according to claim 5 or 6, characterized in that, The front end assembly also includes an elastic element (300), the two ends of which are connected to the instrument tube (200) and the front end seat (100) respectively. The elastic element (300) can drive the instrument tube (200) to move from the third position to the first position or the second position.
8. The front-end component according to claim 7, characterized in that, When the instrument tube (200) is in the first position or the second position, the instrument tube (200) and the front end seat (100) are in an upper limit engagement in the opposite direction to the first direction, and the elastic element (300) is in a deformed state; and / or, The elastic element (300) is an elastic sleeve that seals the gap between the instrument tube (200) and the front end seat (100).
9. The front-end component according to claim 1, characterized in that, The distal end of the front end seat (100) has a first guide surface (103) and a second guide surface (104). The first guide surface (103) and the second guide surface (104) are located on opposite sides of the front end seat (100) and are both in contact with the distal end surface of the front end seat (100). The first instrument port (101) is located on the first guide surface (103) and the second instrument port (102) is located on the second guide surface (104). Along the direction extending from the proximal end to the distal end of the front end seat (100), the distance between the first guide surface (103) and the second guide surface (104) gradually decreases.
10. An endoscope, characterized in that, Includes the front-end component as described in any one of claims 1 to 9.