Bending portion for endoscope and endoscope

Abstract

An endoscope bending portion (100) and an endoscope, the endoscope bending portion (100) including a winding portion (120), the winding portion (120) being provided with a mounting cavity (125) and a first pulling wire hole (121), a second pulling wire hole (122), a third pulling wire hole (123) and a fourth pulling wire hole (124) arranged at intervals around the mounting cavity (125), the mounting cavity (125), the first pulling wire hole (121), the second pulling wire hole (122), the third pulling wire hole (123) and the fourth pulling wire hole (124) all being arranged along the axial direction of the winding portion (120). The winding portion (120) is provided with at least three wire-passing holes arranged at intervals along the circumferential direction of the winding portion (120), each wire-passing hole being connected to a mounting cavity (125), with at least one wire-passing hole being located between the first pulling wire hole (121) and the second pulling wire hole (122), at least one wire-passing hole being located between the second pulling wire hole (122) and the third pulling wire hole (123), and at least one wire-passing hole being located between the third pulling wire hole (123) and the fourth pulling wire hole (124). The bending portion (100) for an endoscope and the endoscope are capable of effectively connecting pulling wires, are highly stable, and do not affect the mounting of other members.

Description

[Technical Field]

[0001] The present invention relates to the technical field of medical devices, and more particularly to a bending section for an endoscope and an endoscope. [Background technology]

[0002] With the development of medical technology, endoscopic technology has emerged. Endoscopes are used to visually inspect hard-to-reach areas, such as internal organs, within the human body to observe pathological changes. Typically, an endoscope includes a long insertion tube with a handle at one end closest to the operator and a visual inspection device, such as a built-in camera, at the distal end of the long insertion tube. To operate the endoscope inside the human body, the endoscope includes a bendable bending section, which allows the tip of the end of the bending section to be adjusted in orientation to change the viewing angle.

[0003] The handle and bending section of an endoscope are connected by two traction wires, allowing the bending section to bend in four directions using the handle, and the traction wires are connected by welding. Due to the high cost of endoscope equipment in conventional technology, endoscopes are sterilized and cleaned after use to enable recycling. This method does not allow for thorough sterilization, and there is a risk of cross-infection. Therefore, disposable endoscopes have emerged, where components such as the bending section are made of plastic, making them disposable.

[0004] However, currently, it is difficult to connect the bending part made of disposable material to the pulling wire by welding, and how to wind the pulling wire around the bending part without affecting the installation of other components is an issue that needs to be solved urgently. Summary of the Invention [Problem to be solved by the invention]

[0005] Based on this, it is necessary to provide a bending portion for an endoscope and an endoscope that can effectively connect a pulling wire, has strong stability, and does not affect the attachment of other components. [Means for solving the problem]

[0006] The bending portion for an endoscope includes a connection portion and a winding portion, the connection portion being configured to be connected to the distal end portion, the winding portion being connected to the connection portion, the winding portion being provided with a mounting cavity, and the winding portion being further provided with a first pulling wire hole, a second pulling wire hole, a third pulling wire hole, and a fourth pulling wire hole that are arranged at intervals around the mounting cavity, and the mounting cavity, the first pulling wire hole, the second pulling wire hole, the third pulling wire hole, and the fourth pulling wire hole are all installed to extend along the axial direction of the winding portion. The winding portion is provided with at least three wire-through holes, which are arranged at intervals along the circumferential direction of the winding portion, and each of the wire-through holes communicates with the mounting cavity, and at least one of the wire-through holes is located between the first pulling wire hole and the second pulling wire hole, at least one of the wire-through holes is located between the second pulling wire hole and the third pulling wire hole, and at least one of the wire-through holes is located between the third pulling wire hole and the fourth pulling wire hole.

[0007] In the process of winding the wire, the bending section for an endoscope has one pulling wire extending from the bottom of the first pulling wire hole along the axial direction of the winding section, then passing through the wire-passing hole between the first and second pulling wire holes and extending through the winding section, then being inserted into the winding section through the wire-passing hole between the second and third pulling wire holes, and finally being inserted from the top of the third pulling wire hole along the axial direction of the winding section from top to bottom, after which another pulling wire extends from the bottom of the second pulling wire hole along the axial direction of the winding section from bottom to top, then being inserted into the winding section through the wire-passing hole between the second and third pulling wire holes and extending through the winding section, then being inserted into the winding section through the wire-passing hole between the third and fourth pulling wire holes, and finally being inserted from the top of the fourth pulling wire hole along the axial direction of the winding section from top to bottom. The endoscopic bending part has a combination of four traction wire holes and at least three wire-passing holes, which allows two traction wires to be stably connected, and the four directions are effectively pulled, the wires are stably wound, and are not easily slippery. Furthermore, the traction wires do not occupy a position within the mounting cavity, and do not affect the mounting of other components or the normal use of the endoscopic bending part.

[0008] In one embodiment, there are at least six wire-threading holes, and the at least six wire-threading holes include a first wire-threading hole, a second wire-threading hole, a third wire-threading hole, a fourth wire-threading hole, a fifth wire-threading hole, and a sixth wire-threading hole that are sequentially arranged at least along the circumferential direction of the winding portion, wherein the first wire-threading hole and the second wire-threading hole are located between the first pulling wire hole and the second pulling wire hole, the third wire-threading hole and the fourth wire-threading hole are located between the second pulling wire hole and the third pulling wire hole, and the fifth wire-threading hole and the sixth wire-threading hole are located between the third pulling wire hole and the fourth pulling wire hole.

[0009] In one embodiment, the winding portion is further provided with a first guide groove, the first guide groove is provided on an outer wall of the winding portion, and the first wire-passing hole and the second wire-passing hole are connected to the first guide groove; the winding portion is further provided with a second guide groove, the second guide groove is provided on an outer wall of the winding portion, and the third wire-passing hole and the fourth wire-passing hole are connected to the second guide groove; the winding portion is further provided with a third guide groove, the third guide groove is provided on an outer wall of the winding portion, and the fifth wire-passing hole and the sixth wire-passing hole are connected to the third guide groove.

[0010] In one embodiment, the first guide groove is arranged to extend along the circumferential direction of the winding portion, the second guide groove is arranged to extend along the circumferential direction of the winding portion, and the third guide groove is arranged to extend along the circumferential direction of the winding portion.

[0011] In one embodiment, the winding portion is further provided with a mounting base, the mounting base is provided on an inner wall of the mounting cavity, and the first pulling wire hole, the second pulling wire hole, the third pulling wire hole and the fourth pulling wire hole are all provided on the mounting base.

[0012] In one embodiment, the mounting base includes a first mounting base, a second mounting base, a third mounting base, and a fourth mounting base arranged sequentially along a circumferential direction of the mounting cavity, the first mounting base being provided with the first pulling wire hole, the second mounting base being provided with the second pulling wire hole, the third mounting base being provided with the third pulling wire hole, and the fourth mounting base being provided with the fourth pulling wire hole.

[0013] In one embodiment, the mount is provided with a position limiter, which is used to prevent a puller wire from entering the mounting cavity.

[0014] In one embodiment, the position limiting portion includes a first boss corresponding to the first pulling wire hole, a second boss corresponding to the second pulling wire hole, a third boss corresponding to the third pulling wire hole, and a fourth boss corresponding to the fourth pulling wire hole, wherein the first pulling wire hole is located between the first boss and an inner wall of the mounting cavity, the second pulling wire hole is located between the second boss and the inner wall of the mounting cavity, the third pulling wire hole is located between the third boss and the inner wall of the mounting cavity, and the fourth pulling wire hole is located between the fourth boss and the inner wall of the mounting cavity.

[0015] In one embodiment, the connection portion and the winding portion are an integral injection molded structure.

[0016] The endoscope includes the bending section for an endoscope described in any one of the above items.

[0017] In the endoscope, during the wire winding process, one pulling wire extends from the bottom of the first pulling wire hole to penetrate from bottom to top along the axial direction of the winding portion, then passes through the wire-passing hole between the first and second pulling wire holes to penetrate the winding portion, then is inserted into the winding portion through the wire-passing hole between the second and third pulling wire holes, and finally is inserted from the top of the third pulling wire hole to penetrate from top to bottom along the axial direction of the winding portion, after which another pulling wire extends from the bottom of the second pulling wire hole to penetrate from bottom to top along the axial direction of the winding portion, then passes through the wire-passing hole between the second and third pulling wire holes to penetrate the winding portion, then is inserted into the winding portion through the wire-passing hole between the third and fourth pulling wire holes, and finally is inserted from the top of the fourth pulling wire hole to penetrate from top to bottom along the axial direction of the winding portion. The endoscopic bending part has a combination of four traction wire holes and at least three wire-passing holes, which allows two traction wires to be stably connected, and the four directions are effectively pulled, the wires are stably wound, and are not easily slippery. Furthermore, the traction wires do not occupy a position within the mounting cavity, and do not affect the mounting of other components or the normal use of the endoscopic bending part.

[0018] The drawings constituting a part of this application are used to provide a further understanding of the present invention, and the schematic embodiments of the present invention and their explanations are used to interpret the present invention and do not constitute an undue limitation on the present invention. In order to more clearly explain the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings that need to be used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention, and those skilled in the art can obtain other drawings from these drawings without any creative work. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a structural schematic diagram 1 of an endoscope bending portion according to one embodiment. FIG. [Figure 2] FIG. 2 is a structural schematic diagram 2 of the bending portion for an endoscope according to one embodiment. [Figure 3] 3 is a structural schematic diagram 3 of the bending portion for an endoscope according to one embodiment. FIG. [Figure 4] 1 is a schematic diagram of the overall structure of an endoscope bending section according to one embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0020] In order to more clearly understand the above-mentioned objects, features, and advantages of the present invention, specific embodiments of the present invention will be described in detail below with reference to the drawings. In the following description, many specific details will be set forth in order to fully understand the present invention. However, the present invention can be embodied in many other forms different from the embodiments described herein, and those skilled in the art will be able to make similar improvements without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific examples disclosed below.

[0021] In describing the present invention, it should be understood that the orientations or positional relationships indicated by the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "up," "down," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc. are based on the orientations or positional relationships shown in the drawings, and are intended only to facilitate and simplify the description of the present invention, and do not mean or suggest that the devices or elements referred to necessarily have a particular orientation or must be configured and operated in a particular orientation, and should not be construed as limiting the present invention.

[0022] It should be noted that the terms "first" and "second" are for descriptive purposes only and are not to be understood as meaning or suggesting relative importance or the number of technical features being described. Thus, a feature qualified with "first" or "second" can explicitly or implicitly include at least one of that feature. In the description of the present invention, unless otherwise expressly and specifically limited, "plurality" means at least two, e.g., two, three, etc.

[0023] In the present invention, unless otherwise clearly defined or limited, the terms "attached," "coupled," "connected," "fixed," etc. should be understood in a broad sense, and may mean, for example, a fixed connection, a detachable connection, or an integral connection. They may also be mechanically connected or electrically connected. They may also be directly connected, indirectly connected via an intermediate medium, or may be internal communication between two elements or an interactive relationship between two elements. The specific meanings of the above terms in the present invention will be understood by those skilled in the art depending on the specific circumstances.

[0024] In the present invention, unless otherwise clearly defined and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact via an intermediate medium. Furthermore, a first feature being "above," "above," or "on the upper surface" of a second feature may simply indicate that the first feature is directly above or diagonally above the second feature, or that the horizontal height of the first feature is greater than that of the second feature. A first feature being "below," "below," or "on the lower surface" of a second feature may simply indicate that the first feature is directly below or diagonally below the second feature, or that the horizontal height of the first feature is smaller than that of the second feature.

[0025] It should be noted that when an element is referred to as being "fixed" or "mounted" to another element, it may be directly connected to the other element, or there may be intervening elements. When an element is considered to be "connected" to another element, it may be directly connected to the other element, or there may be intervening elements. The terms "vertical," "horizontal," "top," "bottom," "left," "right," and similar terms used herein are for descriptive purposes only and do not represent the only embodiment.

[0026] In one embodiment, referring to Figures 1, 2, 3 and 4, the bending portion 100 for an endoscope includes a connecting portion 110 and a winding portion 120, the connecting portion 110 is used to connect to the tip portion, the winding portion 120 is connected to the connecting portion 110, the winding portion 120 is provided with a mounting cavity 125, and the winding portion 120 is further provided with a first puller wire hole 121, a second puller wire hole 122, a third puller wire hole 123 and a fourth puller wire hole 124 arranged at intervals around the mounting cavity 125, and the mounting cavity 125, the first puller wire hole 121, the second puller wire hole 122, the third puller wire hole 123 and the fourth puller wire hole 124 are all installed extending along the axial direction of the winding portion 120, and the winding portion 120 is provided with at least three wire-threading holes, and the at least three wire-threading holes are arranged at intervals along the circumferential direction of the winding portion 120, and each wire-threading hole is connected to a corresponding mounting cavity 125, and at least one wire-threading hole is located between the first pulling wire hole 121 and the second pulling wire hole 122, at least one wire-threading hole is located between the second pulling wire hole 122 and the third pulling wire hole 123, and at least one wire-threading hole is located between the third pulling wire hole 123 and the fourth pulling wire hole 124.

[0027] In the process of winding the wire in the bending portion 100 for an endoscope, one pulling wire extends from the bottom of the first pulling wire hole 121 to penetrate from bottom to top along the axial direction of the winding portion 120, then passes through the wire-passing hole between the first pulling wire hole 121 and the second pulling wire hole 122 to extend through the winding portion 120, then is inserted into the winding portion 120 from the wire-passing hole between the second pulling wire hole 122 and the third pulling wire hole 123, and finally is inserted from the top of the third pulling wire hole 123 to penetrate from top to bottom along the axial direction of the winding portion 120. Thereafter, another pulling wire extends from the bottom of the second pulling wire hole 122, passing from bottom to top along the axial direction of the winding portion 120, then passes through the wire-passing hole between the second pulling wire hole 122 and the third pulling wire hole 123, passes through the winding portion 120, then passes through the wire-passing hole between the third pulling wire hole 123 and the fourth pulling wire hole 124 into the winding portion 120, and finally passes from the top of the fourth pulling wire hole 124, passing from top to bottom along the axial direction of the winding portion 120. The endoscopic bending portion 100 has a combination of four pulling wire holes and at least three wire-passing holes, which allows stable connection of two pulling wires, effectively pulling in four directions, stable winding of the wires, and is not slippery. Furthermore, the pulling wires do not occupy positions within the mounting cavity 125, and do not affect the mounting of other components or the normal use of the endoscopic bending portion 100.

[0028] 1 , there are at least six wire-threading holes. The at least six wire-threading holes include a first wire-threading hole 126, a second wire-threading hole 127, a third wire-threading hole 128, a fourth wire-threading hole 129, a fifth wire-threading hole 130, and a sixth wire-threading hole 131, which are arranged sequentially at least along the circumferential direction of the winding portion 120. The first wire-threading hole 126 and the second wire-threading hole 127 are located between the first pull wire-threading hole 121 and the second pull wire-threading hole 122, the third wire-threading hole 128 and the fourth wire-threading hole 129 are located between the second pull wire-threading hole 122 and the third pull wire-threading hole 123, and the fifth wire-threading hole 130 and the sixth wire-threading hole 131 are located between the third pull wire-threading hole 123 and the fourth pull wire-threading hole 124. In this way, a new wire-winding method is provided for the two pull wires. That is, one pulling wire is inserted from bottom to top into the first pulling wire hole 121, then extends from the first wire-passing hole 126 through the winding portion 120, passes through the second wire-passing hole 127 and continues to extend into the winding portion 120, then extends from the third wire-passing hole 128 through the winding portion 120, passes through the fourth wire-passing hole 129 and passes into the winding portion 120, and is inserted from top to bottom into the third pulling wire hole 123, and after being pulled, the wound wire is fixed. The other pulling wire passes through the second pulling wire hole 122 from bottom to top, then passes through the winding portion 120 through the third wire-passing hole 128, passes through the winding portion 120 through the fourth wire-passing hole 129, passes through the winding portion 120 through the fifth wire-passing hole 130, passes through the winding portion 120 through the sixth wire-passing hole 131, and passes from top to bottom through the fourth pulling wire hole 124, securing the wound wire after being pulled. After being pulled, the space occupied by the wire is further reduced, and friction is increased, preventing slippage and improving the usability and reliability of the bending portion 100 for an endoscope. This embodiment provides only one specific wire winding method, but is not limited thereto.

[0029] 1, 2, and 3, in one embodiment, the winding portion 120 is further provided with a first guide groove 132, which is provided on the outer wall of the winding portion 120, and the first wire-passing hole 126 and the second wire-passing hole 127 are connected to the first guide groove 132. The winding portion 120 is further provided with a second guide groove 133, which is provided on the outer wall of the winding portion 120, and the third wire-passing hole 128 and the fourth wire-passing hole are connected to the second guide groove 133. The winding portion 120 is further provided with a third guide groove 134, which is provided on the outer wall of the winding portion 120, and the fifth wire-passing hole 130 and the sixth wire-passing hole are connected to the third guide groove 134. In this way, the pull wires can be hidden, the protrusions of the pull wires can be avoided, the flatness of the outer wall of the winding 120 can be ensured, and the probability of the pull wires being worn can be reduced.

[0030] 2, 3 and 4, in one embodiment, the first guide groove 132 is installed to extend along the circumferential direction of the winding part 120, the second guide groove 133 is installed to extend along the circumferential direction of the winding part 120, and the third guide groove 134 is installed to extend along the circumferential direction of the winding part 120. As such, the guide grooves are advantageous in improving the convenience of the wire winding process.

[0031] 1, in one embodiment, the winding section 120 is further provided with a mounting base 135, which is provided on the inner wall of the mounting cavity 125, and the first pull wire hole 121, the second pull wire hole 122, the third pull wire hole 123, and the fourth pull wire hole 124 are all provided on the mounting base 135. In this way, the wire winding area can be limited to the mounting base 135, and does not occupy the space of the mounting cavity 125, avoiding affecting the installation and use of other components.

[0032] 1 , the mounting base 135 includes a first mounting base 1351, a second mounting base 1352, a third mounting base 1353, and a fourth mounting base 1354 that are sequentially arranged along the circumferential direction of the mounting cavity 125, with the first mounting base 1351 being provided with a first pulley wire hole 121, the second mounting base 1352 being provided with a second pulley wire hole 122, the third mounting base 1353 being provided with a third pulley wire hole 123, and the fourth mounting base 1354 being provided with a fourth pulley wire hole 124. In this manner, installation positions are provided for the first pulley wire hole 121, the second pulley wire hole 122, the third pulley wire hole 123, and the fourth pulley wire hole 124, respectively, which is advantageous in improving the structural strength of the winding unit 120.

[0033] 1, in one embodiment, the mounting base 135 is provided with a position limiting portion 136, which is used to prevent the puller wire from entering the mounting cavity 125. In this way, the position limiting portion 136 can restrict the puller wire to the mounting base 135, so as not to occupy the space of the mounting cavity 125 and to avoid affecting the installation and use of other components.

[0034] Specifically, referring to FIG. 1 , the position limiting portion 136 includes a first boss 1361 provided corresponding to the first pulling wire hole 121, a second boss 1362 provided corresponding to the second pulling wire hole 122, a third boss 1363 provided corresponding to the third pulling wire hole 123, and a fourth boss 1364 provided corresponding to the fourth pulling wire hole 124, wherein the first pulling wire hole 121 is located between the first boss 1361 and the inner wall of the mounting cavity 125, the second pulling wire hole 122 is located between the second boss 1362 and the inner wall of the mounting cavity 125, the third pulling wire hole 123 is located between the third boss 1363 and the inner wall of the mounting cavity 125, and the fourth pulling wire hole 124 is located between the fourth boss 1364 and the inner wall of the mounting cavity 125. In this way, the positional restriction effect of the first boss 1361, the second boss 1362, the third boss 1363, and the fourth boss 1364 can further restrict the pulling wire to the mounting base 135.

[0035] Alternatively, the connection part 110 and the winding part 120 may be connected by insertion, rivet connection, adhesive, snap fit connection, or other connection methods. Alternatively, the connection part 110 and the winding part 120 may be an integrally molded structure.

[0036] 1, 2, 3, and 4, the connecting portion 110 and the winding portion 120 have an integral injection-molded structure, which is simple in structure, convenient to manufacture, low in cost, and advantageous in improving the connection stability between the connecting portion 110 and the winding portion 120, and further ensuring the structural stability of the bending portion 100 for an endoscope. In this embodiment, only one specific connection method between the connecting portion 110 and the winding portion 120 is provided, but the present invention is not limited thereto.

[0037] In one embodiment, an endoscope (not shown) includes the endoscopic bending portion 100 according to the above embodiments.

[0038] In the process of winding the wire, the endoscope extends one pulling wire from the bottom of the first pulling wire hole 121, passing through the winding section 120 from bottom to top along the axial direction, then passes through the wire-passing hole between the first pulling wire hole 121 and the second pulling wire hole 122, passes through the winding section 120, then passes through the wire-passing hole between the second pulling wire hole 122 and the third pulling wire hole 123 into the winding section 120, and finally passes through the top of the third pulling wire hole 123 from top to bottom along the axial direction of the winding section 120. Thereafter, another pulling wire extends from the bottom of the second pulling wire hole 122, passing from bottom to top along the axial direction of the winding portion 120, then passes through the wire-passing hole between the second pulling wire hole 122 and the third pulling wire hole 123, passes through the winding portion 120, then passes through the wire-passing hole between the third pulling wire hole 123 and the fourth pulling wire hole 124 into the winding portion 120, and finally passes from the top of the fourth pulling wire hole 124, passing from top to bottom along the axial direction of the winding portion 120. The endoscopic bending portion 100 has a combination of four pulling wire holes and at least three wire-passing holes, which allows stable connection of two pulling wires, effectively pulling in four directions, stable winding of the wires, and is not slippery. Furthermore, the pulling wires do not occupy positions within the mounting cavity 125, and do not affect the mounting of other components or the normal use of the endoscopic bending portion 100.

[0039] The technical features of the embodiments described above can be combined in any manner, and for the sake of brevity, not all possible combinations of the technical features in the above embodiments have been described. However, as long as there is no contradiction in the combination of these technical features, it should be considered to be within the scope described in this specification.

[0040] The above examples merely illustrate some embodiments of the present application, and although the descriptions are specific and detailed, they should not be understood as limiting the scope of the present invention. It should be noted that those skilled in the art can make some modifications and improvements within the scope of the present application without departing from the concept of the present application. Therefore, the scope of the patent of the present application shall be determined by the scope of the appended claims. [Explanation of symbols]

[0041] 100 bending portion for endoscope, 110 connection portion, 120 winding portion, 121 first traction wire hole, 122 second traction wire hole, 123 third traction wire hole, 124 fourth traction wire hole, 125 mounting cavity, 126 first wire passing hole, 127 second wire passing hole, 128 third wire passing hole, 129 fourth wire passing hole, 130 fifth wire passing hole, 131 sixth wire passing hole, 132 first guide groove, 133 second guide groove, 134 third guide groove, 135 mounting base, 1351 first mounting base, 1352 second mounting base, 1353 third mounting base, 1354 fourth mounting base, 136 position limiting portion, 1361 first boss, 1362 second boss, 1363 third boss, 1364 fourth boss

Claims

1. A bending portion for an endoscope, a connection portion and a winding portion, the connecting portion is configured to be connected to a tip portion; the winding portion is connected to the connection portion, and a mounting cavity is provided in the winding portion, and the winding portion further includes a first pulling wire hole, a second pulling wire hole, a third pulling wire hole, and a fourth pulling wire hole arranged around the mounting cavity at intervals, the mounting cavity, the first pulling wire hole, the second pulling wire hole, the third pulling wire hole, and the fourth pulling wire hole are all installed to extend along the axial direction of the winding portion, and the winding portion is provided with at least three wire-through holes, the at least three wire-through holes are arranged along the circumferential direction of the winding portion at intervals, and each of the wire-through holes is connected to the mounting cavity; At least one of the wire-threading holes is located between the first pull wire hole and the second pull wire hole, at least one of the wire-threading holes is located between the second pull wire hole and the third pull wire hole, and at least one of the wire-threading holes is located between the third pull wire hole and the fourth pull wire hole; the winding section is further provided with a mounting base, the mounting base is provided on an inner wall of the winding section and surrounds the mounting cavity, and the first pulling wire hole, the second pulling wire hole, the third pulling wire hole, and the fourth pulling wire hole are all provided on the mounting base; The mounting base is provided with a position limiting portion, which is used to prevent a puller wire from entering the mounting cavity; the position limiting portion includes a first boss provided corresponding to the first pulling wire hole, a second boss provided corresponding to the second pulling wire hole, a third boss provided corresponding to the third pulling wire hole, and a fourth boss provided corresponding to the fourth pulling wire hole, wherein the first pulling wire hole is located between the first boss and an inner wall of the winding portion, the second pulling wire hole is located between the second boss and the inner wall of the winding portion, the third pulling wire hole is located between the third boss and the inner wall of the winding portion, and the fourth pulling wire hole is located between the fourth boss and the inner wall of the winding portion.

2. 2. The bending section for an endoscope according to claim 1, wherein there are at least six wire-threading holes, and the at least six wire-threading holes include a first wire-threading hole, a second wire-threading hole, a third wire-threading hole, a fourth wire-threading hole, a fifth wire-threading hole, and a sixth wire-threading hole that are sequentially arranged at least along a circumferential direction of the winding portion, the first wire-threading hole and the second wire-threading hole being located between the first pulling wire hole and the second pulling wire hole, the third wire-threading hole and the fourth wire-threading hole being located between the second pulling wire hole and the third pulling wire hole, and the fifth wire-threading hole and the sixth wire-threading hole being located between the third pulling wire hole and the fourth pulling wire hole.

3. the winding portion is further provided with a first guide groove, the first guide groove being provided on an outer wall of the winding portion, the first wire-passing hole and the second wire-passing hole communicating with the first guide groove; the winding portion is further provided with a second guide groove, the second guide groove being provided on an outer wall of the winding portion, the third wire-passing hole and the fourth wire-passing hole communicating with the second guide groove; 3. The bending portion for an endoscope according to claim 2, wherein the winding portion is further provided with a third guide groove, the third guide groove being provided on an outer wall of the winding portion, and the fifth wire-passing hole and the sixth wire-passing hole communicating with the third guide groove.

4. 4. The bending portion for an endoscope according to claim 3, wherein the first guide groove is arranged to extend along the circumferential direction of the winding portion, the second guide groove is arranged to extend along the circumferential direction of the winding portion, and the third guide groove is arranged to extend along the circumferential direction of the winding portion.

5. 2. The bending section for an endoscope according to claim 1, wherein the mounting base includes a first mounting base, a second mounting base, a third mounting base, and a fourth mounting base that are sequentially arranged along a circumferential direction of the mounting cavity, and the first mounting base is provided with the first traction wire hole, the second mounting base is provided with the second traction wire hole, the third mounting base is provided with the third traction wire hole, and the fourth mounting base is provided with the fourth traction wire hole.

6. 2. The bending section for an endoscope according to claim 1, wherein the connecting section and the winding section are integrally formed by injection molding.

7. An endoscope comprising the bending portion for an endoscope according to any one of claims 1 to 6.

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