Endoscope and medical device

Abstract

The invention discloses an endoscope and a medical device. The endoscope has an insertion part that can be inserted into a body cavity in an insertion direction, and comprises: a distal end part provided on the distal end side of the insertion part; a bending part which is connected to the base end side of the front end part, can be bent, and comprises a plurality of node rings; the limiting part forms a circumferential groove in the front end part; an air vent located closer to the front end side of the front end part than the limiting part; wherein when the balloon is mounted on the endoscope, a first mounting part for fixing the balloon is arranged on the front end part; a second mounting part for fixing the balloon is arranged on the bending part; and the annular component sleeved on the first mounting part is clamped through the limiting part so as to limit the position of the annular component at the front end part. In the using process of the endoscope, the annular part for fastening the balloon can be prevented from sliding, especially sliding to the air hole corresponding to the expansion part of the balloon, the balloon is prevented from blocking the air outlet in the inflating / deflating process, and the using reliability of the endoscope is improved.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more particularly to an endoscope and medical device. Background Technology

[0002] The double-balloon endoscope is well-known as a replacement for the traditional small bowel endoscope. This double-balloon endoscope consists of an endoscope with a balloon at its front end that can supply / extract air into the balloon, and a tubular insertion aid that serves as the insertion part for inserting the endoscope.

[0003] Each balloon in the dual-balloon endoscope is connected to a balloon control device, which supplies / extracts air to each balloon to inflate and contract it.

[0004] When a double-balloon endoscope is inserted into the small intestine, after the endoscope's balloon is inflated and secured to the intestinal segment, the balloon of the insertion aid is deflated, and the insertion aid is advanced along the endoscope's insertion section to the front balloon. Then, the balloon of the insertion aid is inflated again, securing the insertion aid to the intestinal segment, and the endoscope's balloon is deflated, pushing the endoscope's insertion section deeper. This process is repeated while moving the balloon-secured point deeper. When the endoscope's insertion section forms a complex fold, the insertion aid is slowly pulled along with the endoscope while both balloons are inflated. This operation simplifies the folding shape of the intestinal segment without removing the endoscope, shortening the length of the inserted intestinal segment and allowing it to fold onto the insertion aid. Repeating this series of operations simplifies the folding shape of the intestinal segment onto the insertion aid and allows for deeper insertion into the small intestine.

[0005] As described above, the balloon of the endoscope, due to its inflation and use as a fulcrum, is traditionally secured directly at the front end of the endoscope. When the balloon is installed near the inflation port at the front opening or when the endoscope is advanced, the annular component securing the balloon may slide and block the balloon's air vent, causing the balloon to fail to inflate properly or deflate and become stuck in the small intestine. At the same time, the annular component may slide and eventually fall off when it is removed from the body cavity at the end of the examination, leading to medical accidents. Summary of the Invention

[0006] To achieve the above objectives, one embodiment of the present invention is an endoscope having an insertion portion capable of being inserted into a body cavity along an insertion direction, comprising:

[0007] The front end is located on the front end side of the insertion part;

[0008] The bending portion, which is connected to the base end side of the front end portion and is bendable, includes multiple segmental rings;

[0009] A limiting portion, wherein the limiting portion is configured as a circumferential groove in the front end portion;

[0010] The vent is located on the front end side, closer to the front end portion than the limiting portion;

[0011] When a balloon is installed on the endoscope

[0012] The front end is provided with a first mounting part for fixing the balloon;

[0013] The curved portion is provided with a second mounting portion for fixing the balloon;

[0014] The annular component fitted onto the first mounting portion is secured by the limiting portion to define the position of the annular component at the front end.

[0015] Optionally, the vent has a channel support portion on its outer periphery, the channel support portion being higher than the opening surface of the vent and having a notch on the side facing the base end of the front end portion. The notch on the side of the channel support portion facing the inflation portion of the balloon forms a portion that surrounds the outer periphery of the vent.

[0016] Optionally, the curved portion is provided with a feature ring, and the second mounting portion is located at the corresponding position of the feature ring.

[0017] Optionally, the length of the feature segment along the insertion direction is greater than the lengths of the preceding and following segments adjacent to it.

[0018] Optionally, the curved portion includes a distal segment and a proximal segment along the insertion direction. The distal segment is located at the front end of the second mounting portion, and its maximum bending radius is smaller than the maximum bending radius of the proximal segment located at the base end of the second mounting portion.

[0019] Optionally, the insertion portion includes an outer skin, and a circumferential mounting groove is formed on the outer periphery of the outer skin of the feature ring corresponding to the second mounting portion. The width of the mounting groove is not less than the width of the second mounting portion, so as to accommodate the annular component sleeved on the second mounting portion.

[0020] Optionally, the outer diameters of the two ends of the feature ring in the insertion direction are larger than the outer diameter of its middle section, and the outer diameter of the feature ring in the insertion direction is characterized by increasing at both ends and contracting in the middle.

[0021] Optionally, the braided layer of the curved portion includes a front braided layer and a rear braided layer that are independently arranged. The front braided layer and the rear braided layer are respectively arranged on the front end side and the base end side of the feature ring, and the feature ring separates the front braided layer and the rear braided layer in the insertion direction.

[0022] Optionally, the circumferential grooves are toothed along the circumferential direction of the front end portion.

[0023] Another embodiment of the present invention is a medical device comprising the aforementioned endoscope and a tubular insertion aid having an insertion passage for inserting the insertion portion of the endoscope, wherein another balloon is provided at the front end of the insertion aid.

[0024] Therefore, the endoscope disclosed according to the present invention, when a balloon is fixed at the front end, can prevent the endoscope from sliding during use, especially sliding to the air hole corresponding to the balloon expansion part, by providing a limiting part on the front end. This avoids the balloon blocking the air outlet during inflation / deflation, greatly improving the overall structural stability. The structure has high assembly precision, is easy to operate, and has strong structural reliability, significantly improving the safety and stability of the endoscope-balloon assembly in clinical use. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in this 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 some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a system configuration diagram of the medical device of the present invention;

[0027] Figure 2 This is a schematic diagram of the structure of the front end of the endoscope of the present invention;

[0028] Figure 3 This is a schematic diagram of the structure of the balloon of the present invention;

[0029] Figure 4 This is a schematic diagram of the structure of the balloon installed at the front end of the present invention;

[0030] Figure 5 This is a schematic diagram of a structure of the front-end rigid part of the present invention;

[0031] Figure 6 This is a schematic diagram of a structure of the curved portion of the present invention;

[0032] Figure 7This is a schematic diagram of the balloon of the present invention installed in the curved part of the endoscope;

[0033] Figure 8 This is a schematic diagram of the structure in which the annular component of the present invention is fixedly installed on the feature segment ring;

[0034] Figure 9 This is a schematic diagram of the structure of the curved portion of the present invention at its maximum bending radius;

[0035] Figure 10 This is a schematic diagram of a structure of the curved portion of the present invention;

[0036] Figure 11 This is a schematic diagram of another structure of the curved portion of the present invention;

[0037] Figure 12 This is a schematic diagram of the woven mesh structure of the curved portion of the present invention;

[0038] Figure 13 This is a schematic diagram of a feature ring structure of the present invention.

[0039] Explanation of reference numerals in the attached figures

[0040] 10. Endoscope; 20. Insertion aid; 21. Another balloon; 100. Balloon control device; 11. Operating part; 12. Insertion part; 13. Outer skin; 14. Braided mesh; 30. Balloon; 31. Flexible part; 32. Bending part; 33. Anterior end part; 34. Vent; 35. Limiting part; 35a. Thin-walled part; 35b. Annular toothed groove; 36. Objective lens optical system; 37. Illumination lens; 38. Air and water supply nozzle; 39. Instrument channel outlet; 321. Joint ring; 322. Characteristic joint ring; 32a. Distal section; 32b. Proximal section; 30a, 30b. Fitting part; 30c. Inflation part; 40a, 40b. Annular component; 41. First mounting part; 42. Second mounting part; 51. Mounting groove. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this disclosure clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0042] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0043] Figure 1 This is a system configuration diagram of a medical device to which the present invention is applied. The endoscopic device shown in the diagram consists of an endoscope 10, an insertion aid (equivalent to an insertion assist device) 20, and a balloon control device 100.

[0044] The endoscope 10 has an operating section and an insertion section 12 connected to the operating section 11. The insertion section 12 can be inserted into a body cavity in an insertion direction. The insertion section 12 has an outer skin 13 and a braided mesh 14. A cable 17 is connected to the operating section, and a connector (not shown) is provided at the end of the cable 17, which is connected to a processor or light source device (not shown).

[0045] The operating unit 11 is provided with multiple operating buttons for the operator to operate, and a pair of angled handwheels and an instrument insertion port are respectively provided at designated positions. In addition, the operating unit 11 is also provided with a balloon air supply port, which is used to supply air to the balloon 30 or to draw air from the balloon 30.

[0046] The insertion part 12 is composed of a flexible part 31, a bending part 32, and a front end part 33. The front end part 33 is located at the front end of the flexible part 31, and the bending part 32 is connected to the base end of the front end part 33 and is bendable, being formed by multiple joint rings 321 connected in a bendable manner. During operation, the operator can perform bending operations on the bending part 32 in multiple directions through the operating part 11, enabling long-distance bending operations. This allows the front end part 33 to rotate accordingly.

[0047] like Figure 2 As shown, an objective lens optical system 36, an illumination lens 37, an air / water supply nozzle 38, and an instrument channel outlet 39 are provided at predetermined positions on the front end portion 33. Furthermore, a vent 34 is provided on the outer peripheral surface of the front end portion 33, which is connected to the balloon air inlet (not shown) via an air supply tube (not shown) inside the insertion portion 12. Therefore, by supplying gas to the balloon air inlet, gas is blown out from the vent 34 of the front end portion 33; conversely, by drawing gas from the balloon air inlet, gas can be drawn from the vent 34.

[0048] like Figure 1As shown, the balloon 30, when mounted on the front end 33 of the insertion portion 12, is freely detachable and is made of an elastomer such as rubber. Figure 3 and Figure 4 As shown, the balloon 30 is formed by a central expansion portion 30c and fitting portions 30a and 30b at both ends. The vent 34 is installed on the front end portion 33 with the expansion portion 30c located inside it. A first mounting portion 41 for fixing the balloon 30 is provided on the front end portion 33, and a second mounting portion 42 for fixing the balloon 30 is provided on the curved portion 32. The balloon 30 can be fitted and fixed to the first mounting portion 41 and the second mounting portion 42 at the fitting portions 30a and 30b by annular members 40a respectively.

[0049] like Figure 4 As shown, a limiting part 35 is provided at the position corresponding to the first mounting part 41 of the front end portion 33. The limiting part 35 is configured as a circumferential groove of the front end portion 33. This limiting part 35 ensures that when the annular member 40a is fitted onto the first mounting part 41 of the front end portion 33, the annular member 40a is locked within the circumferential groove formed by the limiting part 35, thus limiting the axial position of the annular member 40a in the front end portion 33. This ensures that the annular member 40a is reliably secured and locked in the first mounting part 41, preventing the annular member 40a from sliding and blocking the vent 34 when the balloon 30 is installed or when the endoscope is advanced. The distance between the vent 34 and the circumferential groove can be set to 5mm-6mm, or determined according to the actual size of the annular member 40a. The balloon 30, installed on the front end portion 33 with the vent 34 located in the area of ​​the balloon 30's expansion portion 30c, expands approximately into a spherical shape by blowing gas through the vent 34. On the other hand, by drawing gas from the vent 34, the expansion portion 30c contracts and forms a tight fit on the outer peripheral surface of the front end portion 33.

[0050] The limiting part 35 is used to limit the axial position of the balloon annular component 40a, which is sleeved on the outer surface of the endoscope end 33, to prevent it from sliding during insertion or withdrawal. The limiting part 35 may be configured as a circumferential recessed structure on the outer peripheral surface of the end end 33 to form a mechanical limit on the annular component 40a.

[0051] like Figure 2 or Figure 4As shown, the limiting part 35 includes an annular thin-walled part 35a, which surrounds the outer periphery of the tip end 33 and has a certain axial depth in the insertion direction (i.e., the direction in which the endoscope is inserted into the patient's body cavity). A stepped edge transition zone is formed between the thin-walled part 35a and the adjacent rigid structure of the tip end 33, giving the tip end 33 a stepped structure at this location. This stepped structure provides a clear limiting boundary, ensuring that the balloon annular component 40a is accurately nested in the annular groove formed by the thin-walled part 35a during assembly, preventing positional displacement. Specifically, the axial length of the annular thin-walled part 35a is slightly greater than the axial width of the annular component 40a, ensuring that the annular component 40a is completely within the receiving area of ​​the thin-walled part 35a after insertion, thus preventing it from sliding proximally during endoscope insertion. This structure not only provides a clear assembly reference but also resists the slippage effect of cavity friction on the balloon during operation, significantly improving the overall structural stability.

[0052] like Figure 5 As shown, in another embodiment, the limiting part 35 can be an annular toothed groove 35b. The toothed groove 35b is located on the outer circumferential surface of the head end 33, and its inner wall has multiple equidistant or unequally spaced stepped teeth 35b1, arranged circumferentially to form a multi-point engagement and anti-slip fit. Correspondingly, the inner wall of the annular component 40a can have a multi-toothed structure 40a that meshes with it. During installation, the engagement of multiple tooth surfaces achieves positioning, fixation, and anti-rotation of the annular component 40a. The axial length of the annular toothed groove 35b is also slightly greater than the width of the annular component 40a, allowing for complete fitting. During use, even under external force or rotational disturbance, this structure can achieve an effective anti-slip effect through the interlocking of the teeth. Furthermore, the toothed groove design allows for slight rotational adjustments, improving the flexibility and adjustability of the annular component during installation.

[0053] The limiting part 35 can be configured as a circumferential annular groove, a multi-toothed sawtooth groove or a V-shaped groove, a beveled guide groove, a flange-groove combination structure, etc. The specific structure of the limiting part can be adapted and adjusted according to the material, rigidity and usage scenario of the balloon annular component.

[0054] A vent 34 is located on the endoscope tip 33 and works in conjunction with the balloon 30 to inflate or deflate the balloon during examination or treatment. The balloon 30 expands and contracts using airflow supplied by the vent 34. Specifically, when air is supplied to the vent 34, the inflatable portion 30c of the balloon 30 inflates approximately into a spherical shape. When deflation is required, the vent 34 switches to suction mode, drawing gas out of the balloon 30, causing it to return to its collapsed state. However, during balloon deflation, the balloon wall rapidly retracts as internal pressure decreases, potentially causing the inner surface of the inflatable portion 30c to adhere to the vent 34. This can block the airway, restricting air supply and suction functions, and consequently affecting normal balloon deflation. In this embodiment, a channel support 43, higher than the opening surface, is provided on the outer periphery of the vent 34. The channel support 43 is formed as a non-closed boss structure concentrically distributed around the vent 34 or as two flange structures arranged symmetrically. By providing a notch on the base side of the front end 33, i.e., on the side facing the expansion portion 33c of the balloon 30, the channel support 43 with the notch can prevent the vent from being blocked when the balloon retracts. For example, the non-closed semi-annular protrusion structure can form a defined space when the side wall of the balloon 30 collapses due to deflation and contacts the surface of the front end 33 of the endoscope. Even if the inner wall of the balloon 30 is attached to the surface of the front end 33, it will not directly contact the inlet and outlet of the vent 34, thereby avoiding blockage.

[0055] In one embodiment, the channel support 43 can also be configured as a cross-shaped / radial ridge, with several radially arranged ridges forming a porous channel layout around the vent 34, while increasing the support contact points between the balloon wall and the vent 34.

[0056] In one embodiment, the channel support 43 can be configured as a porous cage-like structure, which covers the outside of the vent 34 through the cage-shaped structure. The cage has multiple through holes or gaps, which can physically block the adsorption of the balloon without hindering the airflow.

[0057] In one embodiment, the anterior endpiece 33 is provided with a transparent cap mounting portion, which is located at the front end of the first mounting portion 41. A buffer area is pre-set between the transparent cap mounting portion and the first mounting portion to avoid interference with airbag contraction or obstruction of the field of vision when the transparent cap is installed. During installation, the transparent cap and the transparent cap mounting portion can be radially interference-fitted for quick assembly and disassembly, and a stop shoulder can be used to prevent over-insertion or detachment.

[0058] like Figure 6As shown, the curved portion 32 at the base end side of the front end portion 33 includes a plurality of segment rings 321, wherein the curved segment ring corresponding to the second mounting position 42 becomes a feature segment ring 322. The length of the feature segment ring 322 in the insertion direction is designed to be no less than the width of the annular member 40b in the insertion direction, so that the annular member 40b completely covers the single feature segment ring 322 after installation, avoiding assembly instability and leakage risks caused by the annular member 40b spanning multiple segment rings. Specifically, for the curved portion 32, the axial length of the feature segment ring 322 in the insertion direction is greater than the lengths of the adjacent preceding and following segment rings. In one embodiment, the length of the feature segment ring 322 in the insertion direction is greater than the length of any other segment ring 321 in the curved portion 32.

[0059] Furthermore, in order to maintain good bending ability and flexibility of the curved portion 32 throughout the small intestine, by lengthening one of the characteristic segments 322 of the curved portion 32 while keeping the remaining segments of the entire curved portion 32 the original size, the overall flexibility of the curved portion 32 can be maintained and the maximum bending radius can be controlled within a preset range (2~3cm), which can meet the maximum bending radius required for endoscope operation in the small intestine.

[0060] In a double-balloon enteroscope, the bend 32 must have good flexibility to allow the endoscope to be advanced, pulled, and oriented within the small intestine. After the first mounting portion 41 reliably locks the balloon 30 onto the anterior end 33, the second mounting portion 42 of the balloon 30 is located on a characteristic segment 322 of the bend 32, such as... Figure 7 As shown, the second mounting portion 42 is entirely located on or coincides with the characteristic ring 322 of the bending portion 33. That is, its annular component 40b completely surrounds the outer circumferential surface of the characteristic ring 322, forming a 360° circumferential closed fit to create a stable sleeve relationship. The annular component 40b of the second mounting portion 42 and the characteristic ring 322 form a circumferential clamping or snap-fit ​​structure, achieving stable fixation of the balloon 30 in the bending portion 32 through mechanical limiting. The characteristic ring 322 not only bears the installation load of the annular component 40b but also maintains surface contact with the annular component 40b during bending, thereby preventing uneven contact or poor sealing caused by bending.

[0061] like Figure 8As shown, the annular component 40b is entirely mounted on a characteristic segmental ring 322. When the balloon 30 is installed onto the second mounting portion 42, during the bending process of the curved portion 32, only the characteristic segmental ring 322 provides rigid constraint, while the two connection points of its front and rear segments can still swing normally, effectively preserving the degree of freedom of movement of the curved portion. Compared to methods that span two or more segments, mounting it on a characteristic segmental ring 322 can minimize the length of the rigid region of the curved portion 32, reduce the loss of the number of movable segments caused by the fixation of the annular component 40b, thereby achieving a bending angle close to the clinical requirements.

[0062] To further compensate for the bending angle, the overall maximum bending angle requirement is maintained. For example... Figure 9 As shown, the bending portion 32 is defined along the axial direction of the insertion portion 12 as a distal segment 32a and a proximal segment 32b. The distal segment 32a is located at the front end of the second mounting portion 42. The connecting chamfer between the serpentine segments of the distal segment 32a (near the anterior end portion 33) is relatively small, allowing the distal segment 32a to form a larger maximum bending radius, providing a gentler bending characteristic. Through bending and coordination with the balloon 30, an effective intestinal wall traction force is formed during expansion. The segmental ring structure of the proximal segment 32b adopts a larger segmental ring chamfer than that of the distal segment 32a, so that the maximum bending radius of the proximal segment 32b is relatively smaller than that of the distal segment 32a. This improves the overall control response speed and maximum bending angle of the bending portion 32, thereby meeting the control performance and propulsion requirements of the endoscope. Therefore, it can compensate for the angle loss caused by the non-active segment of the bend 32 formed by the annular component 40b in the characteristic segment ring 322. By releasing the bending capacity in the rear, angle compensation is achieved in the structure, so that the bend 32 as a whole can still meet the bending target requirements such as 180°, ensuring that the advancement, traction and directional control capabilities of the balloon enteroscope are not affected.

[0063] This embodiment avoids the increased bending rigidity problem caused by mounting the balloon across two or more segments in conventional structures by confining the second mounting portion 42 to a single segment (i.e., the characteristic segment 322). In this structure, the characteristic segment 322 itself serves as the mounting bearing point, and its own rigidity can be used to limit the displacement of the balloon 30 on the bending portion 32. The two adjacent segments before and after it still maintain their original mobility, that is, the balloon installation does not affect the normal swing of the adjacent segments. The effective bending segment of the entire bending portion 32 is almost not sacrificed, with only one segment area having limited rigidity, which greatly preserves the bending freedom and minimum bending radius. While ensuring the stability of balloon installation, the bending performance is effectively optimized, making the endoscope system more flexible and smooth when advancing, pulling, and turning in narrow cavities such as the small intestine. Especially when a large bending angle (such as above 90°) or continuous fluctuation operation is required, it can provide good dynamic response and directional control accuracy.

[0064] In one embodiment, a portion of the insertion portion 12 between the first mounting portion 41 and the second mounting portion 42 has an outer diameter that is not greater than the outer diameter of the remaining portion of the insertion portion. This allows the outer diameter of the balloon 30 to be minimized when it is in a deflated state, which helps to reduce the resistance and friction of the balloon 30 to the intestinal lumen during insertion, thereby improving the overall insertion smoothness and operational safety.

[0065] like Figure 10 and Figure 11 As shown, the outer periphery of the insertion part 12 is covered with an outer skin 13. The curved part 32 forms a circumferential mounting groove 51 on the outer periphery of the outer skin 13 corresponding to the feature ring 322 of the second mounting part 42. The mounting groove 51 allows the annular component 40b installed in the second mounting part 42 to be accommodated therein, so that even when the multiple rings 321 are completely covered by the outer skin 13, they can still be accurately installed to the corresponding position of the feature ring 322. During use, the annular component 40b is prevented from axially slipping due to the application of lubricant to the outer periphery of the insertion part 12, thereby ensuring the stable deployment shape of the balloon after inflation.

[0066] Furthermore, when the mounting groove 51 is preferably located at the position of the outer skin 13 corresponding to the outer periphery of the feature ring 322 in the curved portion 32, after the feature ring 322 is covered with the rubber braided layer 14, the accurate installation position of the ring component 40b can be quickly confirmed and fixed through the mounting groove, thereby improving assembly efficiency and accuracy.

[0067] like Figure 12 As shown, the braided layer 14 is disposed close to the multiple segments 321 of the bending portion 32. The braided layer 14 includes a front braided layer 14a and a rear braided layer 14b, which are independently disposed and introduced from the front end side and the base end side of the bending portion 32, respectively. The front braided layer 14a and the rear braided layer 14b are discontinuously wrapped at the characteristic segment 322. The structural isolation achieved by the characteristic segment 322 can provide reliable installation space for the annular component 40b on the characteristic segment 322 while ensuring bending performance, and avoid the braided layer interfering with its assembly and operation. At the same time, based on the radial contraction characteristics of the braided layer 14 itself, the structural contour of the characteristic segment 322, which is "expanded at both ends and contracted in the middle", is naturally revealed on the bending portion 32 when the position corresponding to the characteristic segment 322 is not covered. This position utilizes the contractility of the braided layer 14 and the concave structural feature of the characteristic segment 322 to provide a positioning reference for the annular component 40b of the balloon 30 at the second mounting portion 42.

[0068] In this embodiment, the braided layer 14 can use a braided structure with radial shrinkage capability to cover multiple loops, such as using PET braided mesh.

[0069] like Figure 13As shown, the outer diameter of the two ends of the feature ring 322 in the insertion direction is larger than that of the middle section, presenting a structure that tapers in the middle and expands at both ends. At this time, the feature ring 322 has an expanded outer diameter at both ends in the insertion direction, while the middle is relatively tapered, forming a "dumbbell-shaped" or "step-shaped" structural form. This can provide a stable installation of the ring component 40b while maintaining the bending performance of the bent part 32. At the same time, the expansion design at both ends can also play a role in separating the braided layer and preventing slippage, thereby improving the overall assembly stability and sealing reliability.

[0070] Another aspect of the present invention provides a medical device comprising the aforementioned endoscope 10 and a tubular insertion aid 20 having an insertion passage for inserting the endoscope into the insertion portion 12, wherein another balloon 21 is provided at the front end of the insertion aid 20. The balloon 30 on the insertion portion 12 and the other balloon 21 at the tip of the insertion aid are alternately inflated to "lock" against the intestinal wall, during which insertion and retraction operations are performed, thereby gradually advancing the insertion portion 12 into the deep part of the intestine while avoiding damage to the intestinal tract due to excessive traction.

[0071] It is further understood that although the operations are described in a specific order in the accompanying drawings in the embodiments of the present invention, this should not be construed as requiring these operations to be performed in the specific order or serial order shown, or requiring all the operations shown to obtain the desired result. In certain environments, multitasking and parallel processing may be advantageous.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features, or different combinations of the above technical features can be made. These modifications, substitutions and combinations do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An endoscope having an insertion portion capable of being inserted into a body cavity along an insertion direction, characterized in that, include: The front end is located on the front end side of the insertion part; The bending portion, which is connected to the base end side of the front end portion and is capable of bending, includes multiple segmental rings; A limiting portion, wherein the limiting portion is configured as a circumferential groove in the front end portion; The vent is located on the front end side, closer to the front end portion than the limiting portion; When a balloon is installed on the endoscope The front end is provided with a first mounting part for fixing the balloon; The curved portion is provided with a second mounting portion for fixing the balloon; The annular component fitted onto the first mounting portion is secured by the limiting portion, thereby defining the position of the annular component at the front end.

2. The endoscope according to claim 1, characterized in that, The vent is provided with a channel support on its outer periphery. The channel support is higher than the opening surface of the vent and has a notch on the side facing the base end of the front end.

3. The endoscope according to claim 1, characterized in that, The curved portion is provided with a feature ring, and the second mounting portion is provided on the feature ring.

4. The endoscope according to claim 3, characterized in that, The length of the feature segment along the insertion direction is greater than the lengths of the preceding and following segments adjacent to it.

5. The endoscope according to claim 1, characterized in that, The curved portion includes a distal segment and a proximal segment along the insertion direction. The distal segment is located at the front end of the second mounting portion, and its maximum bending radius is smaller than that of the proximal segment located at the base end of the second mounting portion.

6. The endoscope according to any one of claims 3, characterized in that, The insertion part includes an outer skin, and the outer periphery of the outer skin of the feature ring is provided with a mounting groove. The width of the mounting groove is not less than the width of the second mounting part, so as to accommodate the annular component sleeved on the second mounting part.

7. The endoscope according to claim 3, characterized in that, The outer diameters of the two ends of the feature ring in the insertion direction are larger than the outer diameter of its middle section.

8. The endoscope according to claim 7, characterized in that, The braided layer of the curved portion includes a front braided layer and a rear braided layer that are independently arranged, and the front braided layer and the rear braided layer are respectively arranged on the front end side and the base end side of the feature ring.

9. The endoscope according to claim 1, characterized in that, The circumferential grooves are toothed along the circumferential direction of the front end.

10. A medical device, characterized in that, The device includes an endoscope as described in any one of claims 1 to 9 and a tubular insertion aid having an insertion passage with the insertion portion, wherein another balloon is provided at the front end of the insertion aid.

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