Endoscope and insertion part and active bending section thereof

Abstract

The utility model belongs to the technical field of medical instruments, and particularly relates to an endoscope and an insertion part and an active bending section thereof. The active bending section comprises a plurality of snake bones which are connected in sequence, one of any two adjacent snake bones is provided with a rotating lug, the other snake bone is provided with a rotating groove, and the rotating lug is rotationally matched with the rotating groove; in every two adjacent snake bones, the one provided with the rotating groove is provided with two arc-shaped arms which are oppositely arranged, and the rotating groove is formed between the two arc-shaped arms; the ratio of the outer diameter of the snake bone to the inner diameter of the arc-shaped arm is 2.2-2.7; and / or the ratio of the outer diameter of the snake bone to the outer diameter of the arc-shaped arm is 1.0-1.4. By adopting the active bending section, the risk that two adjacent snake bones are separated and even the active bending section cannot be bent can be reduced.

Description

Technical Field

[0001] This application belongs to the technical field of medical devices, and particularly relates to an endoscope, its insertion part, and an active bending section. Background Art

[0002] The active bending section of an endoscope is formed by sequentially connecting multiple snake bones. The adjacent two snake bones are rotationally matched through a rotating ear and a rotating groove, so that the adjacent two snake bones can rotate relative to each other within a certain range, thereby realizing the bending of the active bending section.

[0003] When using the current endoscope in cooperation with a guiding sheath to remove kidney stones, the endoscope can be inserted into the sheath tube of the guiding sheath, and the sheath tube can be bent by driving the active bending section of the endoscope, so that the sheath tube faces the stone, and the stone can be aspirated and discharged by using the sheath tube. However, during the stone removal process, the adjacent two snake bones often separate, and even the active bending section cannot be bent. Utility Model Content

[0004] The purpose of this application is to provide an endoscope, its insertion part, and an active bending section, which can reduce the risk of separation between adjacent two snake bones and the inability of the active bending section to bend.

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

[0006] In a first aspect, this application provides an active bending section of an endoscope, including multiple sequentially connected snake bones. Among any adjacent two snake bones, one is provided with a rotating ear, and the other is provided with a rotating groove, and the rotating ear is rotationally matched with the rotating groove;

[0007] Among adjacent two snake bones, the one provided with the rotating groove has two arc-shaped arms arranged oppositely, and a rotating groove is formed between the two arc-shaped arms;

[0008] The ratio of the outer diameter of the snake bone to the inner diameter of the arc-shaped arm is 2.2 - 2.7; and / or, the ratio of the outer diameter of the snake bone to the outer diameter of the arc-shaped arm is 1.0 - 1.4.

[0009] In a second aspect, this application provides an insertion part of an endoscope, including the above-mentioned active bending section.

[0010] In a third aspect, this application provides an endoscope, including the above-mentioned insertion part.

[0011] The beneficial technical effects of this application are as follows:

[0012] In this application, a rotating groove is formed between the two arc-shaped arms, and the rotating groove is rotationally matched with the rotating ear. That is to say, the inner diameter of the arc-shaped arm is the diameter of the rotating ear, and the ratio of the outer diameter of the snake bone in this application to the inner diameter of the arc-shaped arm is 2.2 - 2.7; and / or, the ratio of the outer diameter of the snake bone to the outer diameter of the arc-shaped arm is 1.0 - 1.4.

[0013] When the ratio of the outer diameter of the snake bone to the inner diameter of the arc-shaped arm is 2.2 to 2.7, the inner diameter of the arc-shaped arm can have a relatively large size, that is, the rotation ear can have a relatively large diameter size. This can increase the structural strength of the rotation ear, enabling it to resist greater bending stress and reducing the risk of the rotation ear being damaged by the bending stress. Moreover, after the rotation ear has a relatively large diameter size, the contact area between the rotation ear and the arc-shaped arm will also increase accordingly, which can reduce the bending stress per unit area on the arc-shaped arm and the rotation ear, and reduce the risk of the rotation ear and the arc-shaped arm being damaged by the bending stress.

[0014] When the ratio of the outer diameter of the snake bone to the outer diameter of the arc-shaped arm is 1.0 to 1.4, the outer diameter of the arc-shaped arm can be relatively large. At this time, if the diameter size of the rotation ear is small, that is, the inner diameter of the arc-shaped arm is small, the arc-shaped arm can have a relatively large width size, which can increase the structural strength of the arc-shaped arm and reduce the risk of it being damaged by the bending stress. If the diameter size of the rotation ear is large, the structural strength of the rotation ear can be increased, and the contact area between the rotation ear and the arc-shaped arm can be increased, reducing the risk of the rotation ear and the arc-shaped arm being damaged by the bending stress.

[0015] It can be seen that after adopting the active bending section of the present application, the risk of the rotation ear and / or the arc-shaped arm being damaged by the bending stress can be reduced, so as to reduce the situation where two adjacent snake bones are separated and the active bending section cannot be bent. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Isometric view of the active bending section disclosed in the embodiment of the present application;

[0017] Figure 2 Of the present application Figure 1 Enlarged schematic view of part A;

[0018] Figure 3 Top view of the active bending section disclosed in the embodiment of the present application;

[0019] Figure 4 Of the present application Figure 3 Enlarged schematic view of part B;

[0020] Figure 5 Isometric view of the active bending section when it is bent to the limit position in the embodiment of the present application;

[0021] Figure 6 Of the present application Figure 5 Enlarged schematic view of part C;

[0022] Figure 7 Isometric view of the endoscope disclosed in the embodiment of the present application.

[0023] Description of the reference numerals:

[0024] 100. Snake bone; 101. Rotation groove; 102. Avoidance gap; 110. Rotation ear; 120. Arc-shaped arm; 130. Through groove; 131. First sub-groove; 132. Second sub-groove; 140. Thread-passing part; 150. Contact part; 160. Arc-shaped groove; 200. Insertion part; 300. Operating handle. Detailed implementation manners

[0025] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0026] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same type, and the number of objects is not limited. For example, the first object can be one or multiple. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally indicates an "or" relationship between the associated objects before and after.

[0027] Next, in conjunction with the accompanying drawings, the endoscope, its insertion part, and the active bending section provided by the embodiments of the present application will be described in detail through specific embodiments and their application scenarios.

[0028] In the embodiments of the present application, "proximal end" and "distal end" refer to the relative positions of the endoscope and its components to the user in the use environment. Among them, the end closer to the user is designated as the "proximal end", and the end farther from the user is designated as the "distal end".

[0029] The inventor found that the sheath of the guiding sheath has a certain stiffness. After the distal end of the sheath is bent by the active bending section, the sheath will apply a reverse torque to the active bending section, thereby hindering the bending of the active bending section, and the reverse torque will also form a bending stress on the active bending section. The bending stress is distributed on the rotation ear and the arc-shaped arm between two adjacent snake bones. Currently, the sizes of the rotation ear and the arc-shaped arm of the active bending section are both small, and the structural strength is low. Both are easily damaged under the action of the bending stress, resulting in the separation of two adjacent snake bones or even the situation where the active bending section cannot be bent.

[0030] As Figures 1 to 6As shown, an active bending section of an endoscope is disclosed in an embodiment of the present application. The active bending section can be formed by integral cutting or integral injection molding. The active bending section includes a plurality of sequentially connected snake bones 100. Among any two adjacent snake bones 100, one is provided with a rotating ear 110, and the other is provided with a rotating groove 101. The rotating ear 110 is rotationally engaged with the rotating groove 101. That is to say, the rotating ear 110 is embedded in the rotating groove 101, and the groove wall of the rotating groove 101 provides constraint support for the rotating ear 110, thereby realizing the relative rotation between the snake bones 100. Among two adjacent snake bones 100, the one provided with the rotating groove 101 has two oppositely arranged arc-shaped arms 120, and a rotating groove 101 is formed between the two arc-shaped arms 120.

[0031] Specifically, the snake bone 100 is the main component of the active bending section. A plurality of snake bones 100 are sequentially connected to have a certain extended length; at the same time, adjacent snake bones 100 are rotationally engaged with each other, so that the bending action of the active bending section can be realized. In a common application scenario, the active bending section drives the relative rotation between the snake bones 100 by transmitting a force through a traction rope, thereby realizing the bending action of the active bending section.

[0032] The ratio of the outer diameter of the snake bone 100 to the inner diameter of the arc-shaped arm 120 is 2.2 to 2.7; and / or, the ratio of the outer diameter of the snake bone 100 to the outer diameter of the arc-shaped arm 120 is 1.0 to 1.4.

[0033] For reference, Figure 4 , the outer diameter of the snake bone 100 is the Figure 4 marked as D1 in Figure 4 , the inner diameter of the arc-shaped arm 120 is the Figure 4 marked as D2 in

[0034] In the present application, a rotating groove 101 is formed between the two arc-shaped arms 120, and the rotating groove 101 is rotationally engaged with the rotating ear 110. That is to say, the inner diameter of the arc-shaped arm 120 is the diameter of the rotating ear 110, and the ratio of the outer diameter of the snake bone 100 to the inner diameter of the arc-shaped arm 120 in the present application is 2.2 to 2.7; and / or, the ratio of the outer diameter of the snake bone 100 to the outer diameter of the arc-shaped arm 120 is 1.0 to 1.4.

[0035] Optionally, the ratio of the outer diameter of the snake bone 100 to the inner diameter of the arc-shaped arm 120 can be 2.3, 2.4, 2.5, 2.6, etc., and the ratio of the outer diameter of the snake bone 100 to the outer diameter of the arc-shaped arm 120 can be 1.1, 1.2, 1.3, etc. The present application does not limit this.

[0036] Optionally, the outer diameter of the snake bone 100 is 2.2 to 2.6 mm, and it can be specifically 2.3, 2.4, 2.5, etc. The present application does not limit the specific value of the outer diameter of the snake bone 100.

[0037] In the embodiments of the present application, when the ratio of the outer diameter of the snake bone 100 to the inner diameter of the arc-shaped arm 120 is 2.2 to 2.7, the inner diameter of the arc-shaped arm 120 can have a relatively large size, that is, the rotation ear 110 can have a relatively large diameter size. This can increase the structural strength of the rotation ear 110, enabling it to resist greater bending stress and reducing the risk of the rotation ear 110 being damaged by the bending stress. And after the rotation ear 110 has a relatively large diameter size, the contact area between the rotation ear 110 and the arc-shaped arm 120 will also increase accordingly, which can reduce the bending stress per unit area on the arc-shaped arm 120 and the rotation ear 110, and reduce the risk of the rotation ear 110 and the arc-shaped arm 120 being damaged by the bending stress.

[0038] When the ratio of the outer diameter of the snake bone 100 to the outer diameter of the arc-shaped arm 120 is 1.0 to 1.4, the outer diameter of the arc-shaped arm 120 can be relatively large. At this time, if the diameter size of the rotation ear 110 is small, that is, the inner diameter of the arc-shaped arm 120 is small, the arc-shaped arm 120 can have a relatively large width size, which can increase the structural strength of the arc-shaped arm 120 and reduce the risk of it being damaged by the bending stress. If the diameter size of the rotation ear 110 is large, the structural strength of the rotation ear 110 can be increased, and the contact area between the rotation ear 110 and the arc-shaped arm 120 can be increased, reducing the risk of the rotation ear 110 and the arc-shaped arm 120 being damaged by the bending stress.

[0039] It can be seen that after adopting the active bending section of the present application, the risk of the rotation ear 110 and / or the arc-shaped arm 120 being damaged by the bending stress can be reduced, so as to reduce the situation where two adjacent snake bones 100 are separated and the active bending section cannot be bent.

[0040] It should be noted that when the ratio of the outer diameter of the snake bone 100 to the inner diameter of the arc-shaped arm 120 is 2.2 to 2.7 and the ratio of the outer diameter of the snake bone 100 to the outer diameter of the arc-shaped arm 120 is 1.0 to 1.4, the rotation ear 110 can have a relatively large diameter size, and the arc-shaped arm 120 can have a relatively large width size. This can not only make both the rotation ear 110 and the arc-shaped arm 120 have relatively large structural strength, but also increase the contact area between them, so as to further reduce the risk of the rotation ear 110 and the arc-shaped arm 120 being damaged by the bending stress.

[0041] In an alternative embodiment, the ratio of the outer diameter of the snake bone 100 to the axial distance between the rotation centers of two adjacent snake bones 100 is 1.0 to 1.3. In this way, the rotation ear 110 can protrude from the end face of the snake bone 100 by an appropriate distance, preventing the distance of the rotation ear 110 protruding from the end face of the snake bone 100 from being too large and reducing its structural strength, thereby further reducing the risk of the rotation ear 110 being damaged.

[0042] Optionally, the ratio of the outer diameter of the snake bone 100 to the axial distance between the rotation centers of two adjacent snake bones 100 may be 1.1, 1.2, etc., and the present application is not limited thereto. Of course, the ratio of the outer diameter of the snake bone 100 to the axial distance between the rotation centers of two adjacent snake bones 100 may also be less than 1.0 or greater than 1.3, and the present application is not limited thereto.

[0043] Generally speaking, each end of the snake bone 100 has abutment parts 150 on both sides along the bending direction. Here, the two sides of the snake bone 100 along the bending direction are the two sides of the snake bone 100 along the second direction, the second direction is perpendicular to the axis of the active bending section, and the second direction is perpendicular to the rotation axis of the snake bone 100. When the active bending section is bent to the extreme position, the abutment parts 150 of the two adjacent snake bones 100 abut against each other. Since there is a hard abutment between the two adjacent snake bones 100, after the active bending section is bent to the extreme position, if the traction rope is further pulled due to misoperation, causing the two adjacent snake bones 100 to rotate further, the two adjacent snake bones 100 may be damaged.

[0044] To prevent two adjacent snake bones 100 from being damaged, in an optional embodiment, at least some of the multiple snake bones 100 are provided with through grooves 130, which extend around the axis of the snake bone 100 and are located on one side of the snake bone 100 along the bending direction of the active bending section. Optionally, the through grooves 130 here may only extend along the circumference of the snake bone 100; or, the through grooves 130 extend along the circumference of the snake bone 100 and the axial direction of the snake bone 100 at the same time.

[0045] In this embodiment, at least part of the snake bones 100 is provided with a through groove 130, which penetrates from the outer peripheral surface of the snake bone 100 to the inner peripheral surface of the snake bone 100, and the through groove 130 is located on one side of the snake bone 100 along the bending direction of the active bending section, that is, the through groove 130 and the abutment portion 150 are arranged correspondingly, which can reduce the rigidity of the part of the snake bone 100 located on one side of itself along the bending direction of the active bending section, so that this part of the snake bone 100 has a strong deformation ability, that is, the two adjacent snake bones 100 are no longer hard abutted. In this way, after the active bending section is bent to the limit position, even if the traction rope is further pulled to cause the two adjacent snake bones 100 to rotate further, the abutment portion 150 of the snake bone 100 can squeeze and deform the snake bone 100 provided with the through groove 130, and release the abutment force between the two adjacent snake bones 100 through deformation, thereby reducing the risk of damage to the two adjacent snake bones 100. Of course, the snake bone 100 may not be provided with the above-mentioned through groove 130, and the present application is not limited to this.

[0046] In an alternative embodiment, the active bending section includes a plurality of snake bone groups sequentially distributed in a first direction, and each snake bone group includes three snake bones 100 sequentially connected thereto. Herein, the first direction is the direction extending from the distal end to the proximal end of the active bending section. Specifically, the distal end of the active bending section is Figure 1 the lower left end of the active bending section in Figure 1 , and the proximal end of the active bending section is Figure 2 the upper right end of the active bending section in Figure 2 .

[0047] In the first direction, a through groove 130 is provided in the first or second snake bone 100 in the snake bone group. That is to say, a through groove 130 is provided in the first snake bone 100 in each snake bone group, or a through groove 130 is provided in the second snake bone 100 in each snake bone group.

[0048] In this embodiment, each snake bone group includes three snake bones 100 sequentially connected thereto. Along the first direction, the snake bones 100 in each snake bone group are respectively the first snake bone 100, the second snake bone 100, and the third snake bone 100. A through groove 130 is provided in the first or second snake bone 100 in the snake bone group. In this way, one of the two snake bones 100 adjacent to any snake bone 100 without a through groove 130 is provided with a through groove 130, so that any snake bone 100 without a through groove 130 has an adjacent snake bone 100 with a through groove 130, thereby reducing the risk of damage to each snake bone 100. And in this embodiment, only one snake bone 100 in every three snake bones 100 is provided with a through groove 130. In this way, not only can the active bending section have greater structural strength, but also the processing difficulty of the active bending section can be reduced.

[0049] In an alternative embodiment, the through groove 130 includes a first sub-groove 131 and a second sub-groove 132 spaced apart along the axial direction of the snake bone 100. A wire threading portion 140 is formed between the first sub-groove 131 and the second sub-groove 132, and the wire threading portion 140 is recessed inward to form a pulling rope through groove.

[0050] In this embodiment, the wire threading portion 140 is recessed and deformed toward the inside of the snake bone 100, so that at least a part of the wire threading portion 140 is located inside the snake bone 100 to form a pulling rope through groove. The pulling rope through groove is used for threading a pulling rope for driving the active bending section to bend. After the pulling rope is threaded through the pulling rope through groove, the wire threading portion 140 and the inner wall of the snake bone 100 are respectively located on opposite sides of the pulling rope, thereby preventing the pulling rope from moving radially and improving the installation reliability of the pulling rope. It can be seen that the through groove 130 in this embodiment can not only prevent the snake bone 100 from being damaged, but also improve the installation reliability of the pulling rope, so as to achieve the purpose of dual use of one object.

[0051] In an alternative embodiment, each end of the snake bone 100 has abutting portions 150 on both sides along the bending direction. When the active bending section is bent to the limit position, the abutting portions 150 of two adjacent snake bones 100 abut against each other. In the axial direction of the active bending section, the orthographic projection of the abutting portion 150 is completely within the orthographic projection of the corresponding through groove 130. It should be noted that in this embodiment, when the active bending section is in a fully straightened state, the following is satisfied: in the axial direction of the active bending section, the orthographic projection of the abutting portion 150 is completely within the orthographic projection of the corresponding through groove 130.

[0052] In this embodiment, in the axial direction of the active bending section, the orthographic projection of the abutting portion 150 is completely within the orthographic projection of the corresponding through groove 130. That is to say, there is no part of the mutually abutting portions of two adjacent snake bones 100 that is axially misaligned with the through groove 130. The acting force exerted when two adjacent snake bones 100 abut acts entirely on the parts of the snake bone 100 and the through groove 130 that are opposite in the axial direction. In this way, it is easier to squeeze and deform the snake bone 100 provided with the through groove 130, and release the abutting force between two adjacent snake bones 100 through deformation, further reducing the risk of damage to two adjacent snake bones 100. Of course, in the axial direction of the active bending section, a part of the orthographic projection of the abutting portion 150 may also be outside the orthographic projection of the corresponding through groove 130, and the present application does not limit this.

[0053] Generally speaking, in order to enable the insertion portion 200 to enter the human body cavity more smoothly, the active bending section generally has a two-way bending function. In order to prevent the active bending section from being damaged after being bent to the limit position in two directions respectively, in an alternative embodiment, the number of through grooves 130 on the snake bone 100 provided with the through groove 130 includes two, and the two through grooves 130 are respectively located on both sides of the snake bone 100 along the bending direction of the active bending section.

[0054] In this embodiment, through grooves 130 are provided on both sides of the snake bone 100 along the bending direction of the active bending section. In this way, after the active bending section is bent to the limit position in two directions respectively, even if the traction rope is further pulled to cause two adjacent snake bones 100 to rotate further, the abutting portion 150 of the snake bone 100 can squeeze and deform the snake bone 100 provided with the through groove 130, release the abutting force between two adjacent snake bones 100 through deformation, and reduce the risk of damage to two adjacent snake bones 100. Of course, the number of through grooves 130 on the snake bone 100 provided with the through groove 130 may also be only one, and in this case, the through groove 130 is provided on one side of the snake bone 100 along the direction of the active bending section, and the present application does not limit the number of through grooves 130.

[0055] In an alternative embodiment, please refer to Figure 6, among two adjacent snake bones 100, one of the rotating ears 110 is further provided with a guiding part, the guiding part includes two arc-shaped grooves 160, the two arc-shaped grooves 160 are respectively located on both sides of the rotating ear 110, and each arc-shaped arm 120 is respectively rotationally matched with the corresponding arc-shaped groove 160. Specifically speaking, in this embodiment, on the basis that the snake bones 100 are rotationally matched through the rotating ears 110 and the rotating grooves 101, another set of rotating pairs are formed between the rotating ears 110 and the rotating grooves 101 through the arc-shaped arms 120 and the arc-shaped grooves 160 on the periphery, which is equivalent to that adjacent two snake bones 100 both have extension structures to realize mutual embedding, which is beneficial to improving the connection reliability between the snake bones 100 and the stability of the rotational fit.

[0056] When the active bending section is bent to the limit position, there is a clearance gap 102 between each arc-shaped arm 120 and the end wall of the corresponding arc-shaped groove 160. Specifically speaking, the end wall of the arc-shaped groove 160 is the inner wall of the arc-shaped groove 160 along the direction of its rotational fit with the arc-shaped arm 120.

[0057] In this embodiment, when the active bending section is bent to the limit position, there is a clearance gap 102 between each arc-shaped arm 120 and the end wall of the corresponding arc-shaped groove 160, that is to say, the arc-shaped arm 120 does not abut against the end wall of the corresponding arc-shaped groove 160, so as to prevent internal stress from being generated between the arc-shaped arm 120 and the arc-shaped groove 160, and further prevent the arc-shaped arm 120 from being damaged by the internal stress. Of course, when the active bending section is bent to the limit position, each arc-shaped arm 120 and the end wall of the corresponding arc-shaped groove 160 can also abut against each other, and this application does not limit this.

[0058] The embodiment of the present application also discloses an insertion part of an endoscope, including the active bending section described in any of the above embodiments, so that the insertion part 200 has the beneficial effects of the above active bending section, which will not be elaborated here.

[0059] As Figure 7 shown, the embodiment of the present application also discloses an endoscope, including the above-mentioned insertion part 200. Optionally, the endoscope further includes an operation handle 300, the distal end of the operation handle 300 is connected to the proximal end of the insertion part 200, and the active bending section of the insertion part 200 can be controlled to bend through the operation handle 300. The endoscope referred to in the embodiment of the present application can be a bronchoscope, a pyeloscope, an esophagoscope, a gastroscope, a colonoscope, an otoscope, a nasal endoscope, an oral endoscope, a laryngoscope, a vaginoscope, a laparoscope, an arthroscope, etc., and the embodiment of the present application does not specifically limit the type of the endoscope.

[0060] In the above embodiments of the present application, the differences between the various embodiments are mainly described. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. For the sake of brevity in writing, they will not be elaborated here. The embodiments of the present application have been described above with reference to the accompanying drawings. However, the present application is not limited to the above specific implementation manners. The above specific implementation manners are merely illustrative rather than restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims, and all of them fall within the protection scope of the present application.

Claims

1. An actively bendable section of an endoscope, characterized in that, It includes a plurality of snake bones (100) connected in sequence. Among any two adjacent snake bones (100), one is provided with a rotating ear (110), and the other is provided with a rotating groove (101), and the rotating ear (110) is rotationally matched with the rotating groove (101); Among two adjacent snake bones (100), the one provided with the rotating groove (101) has two arc-shaped arms (120) arranged oppositely, and the rotating groove (101) is formed between the two arc-shaped arms (120); The ratio of the outer diameter of the snake bone (100) to the inner diameter of the arc-shaped arm (120) is 2.2 to 2.7; and / or, the ratio of the outer diameter of the snake bone (100) to the outer diameter of the arc-shaped arm (120) is 1.0 to 1.

4.

2. The active bending section according to claim 1, wherein, The ratio of the outer diameter of the snake bone (100) to the axial distance between the rotation centers of two adjacent snake bones (100) is 1.0 to 1.3; and / or, The outer diameter of the snake bone (100) is 2.2 to 2.6 mm.

3. The active bending section according to claim 1, wherein Among the plurality of snake bones (100), at least some of the snake bones (100) are provided with a through groove (130), the through groove (130) extends around the axis of the snake bone (100), and the through groove (130) is located on one side of the snake bone (100) along the bending direction of the active bending section.

4. The active bending section according to claim 3, wherein The active bending section includes a plurality of snake bone groups distributed in sequence in a first direction, and each snake bone group includes three snake bones (100) connected in sequence, wherein the first direction is the direction extending from the distal end to the proximal end of the active bending section; In the first direction, the first or second snake bone (100) in the snake bone group is provided with the through groove (130).

5. The active bending section according to claim 3, wherein, The through groove (130) includes a first sub-groove (131) and a second sub-groove (132) spaced apart along the axis of the snake bone (100), and a threading part (140) is formed between the first sub-groove (131) and the second sub-groove (132), and a traction rope passing groove is formed by the inward concavity of the threading part (140).

6. The active bending section according to claim 3, wherein Both sides of each end of the snake bone (100) along the bending direction have abutting parts (150). In the case where the active bending section is bent to the limit position, the abutting parts (150) of two adjacent snake bones (100) abut against each other; Axially of the active bending section, the orthographic projection of the abutting part (150) is completely within the orthographic projection of the corresponding through groove (130).

7. The active bending section according to any one of claims 3 to 6, characterized in that, The number of through grooves (130) on the snake bone (100) provided with the through groove (130) is two, and the two through grooves (130) are respectively located on both sides of the snake bone (100) along the bending direction of the active bending section.

8. The active bending section according to claim 1, wherein In two adjacent ones of the snake bones (100), one of the rotating ears (110) is further provided with a guiding portion, the guiding portion includes two arc-shaped grooves (160), the two arc-shaped grooves (160) are respectively located on two sides of the rotating ear (110), and each arc-shaped arm (120) is respectively in rotational cooperation with the corresponding arc-shaped groove (160); When the active bending section is bent to the limit position, there is a clearance (102) between each arc-shaped arm (120) and the end wall of the corresponding arc-shaped groove (160).

9. An insertion portion of an endoscope, characterized in that, It includes the active bending section according to any one of claims 1 to 8.

10. An endoscope, characterized in that, It includes the insertion portion (200) according to claim 9.

Images