Connection structure between the curved section and the insertion tube and endoscope

Abstract

A connection structure (100) between a bending portion and an insertion tube, and an endoscope, wherein the connection structure (100) between a bending portion and an insertion tube includes a bending portion (110), a connecting tube (120), and an insertion tube (130), wherein a first attachment portion (111) is provided on the bending portion (110) and is located in the circumferential direction of the bending portion (110), the connecting tube (120) is fitted to the bending portion (110), and wherein a second attachment portion (121) is provided on the connecting tube (120) and is located in the circumferential direction of the connecting tube (120), and the first attachment portion (111) is snap-fitted into the second attachment portion (121), thereby connecting the bending portion (110) to the connecting tube (120), and the insertion tube (130) is adhered to the connecting tube (120). In the above-mentioned bending portion / insertion tube connection structure (100) and endoscope, the connection tube (120) is fitted to the bending portion (110) and connected by snap fitting, which is advantageous in reducing the probability that the first fastening portion (111) and the second fastening portion (121) will be broken due to an external force, and ensures the stability of the entire structure of the bending portion / insertion tube connection structure (100). In addition, the connection tube (120) is bonded to the insertion tube (130), which indirectly connects the bending portion (110) and the insertion tube (130), which is advantageous in avoiding the risk of the bending portion (110) falling off due to the lack of stability caused by direct bonding.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, particularly to a connection structure between a bending portion and an insertion tube and an endoscope.

Background Art

[0002] With the development of medical technology, endoscope technology has emerged. An endoscope is used for visual inspection of inaccessible parts such as organs inside the human body to observe the situation of pathological changes. Usually, an endoscope includes a long insertion tube, has a handle at one end close to the operator of the insertion tube, and has 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 portion, and by bending the bending portion, the orientation of the tip of the end of the bending portion is adjusted to change the observation angle.

[0003] In the prior art, the insertion tube is a braided tube, and the insertion tube and the plastic bending portion are connected by an adhesive method. However, since the adhesive performance of the material adopted for the bending portion is extremely poor, the adhesive method is likely to cause the bending portion to fall off from the insertion tube, the adhesive effect is poor, and it is likely to cause the bending portion to remain inside the human organ after falling off from the insertion tube, leading to the occurrence of medical accidents.

Summary of the Invention

Problems to be Solved by the Invention

[0004] Based on this, there is a need to provide a connection structure between a bending portion and an insertion tube and an endoscope that can effectively improve the connection stability between the bending portion and the insertion tube, avoid the falling off of the bending portion, and reduce the occurrence probability of medical accidents.

Means for Solving the Problems

[0005] The connection structure between the curved portion and the insertion tube includes a curved portion, a connecting tube, and an insertion tube, wherein the curved portion is provided with a first engagement portion, the first engagement portion is located in the circumferential direction of the curved portion, the connecting tube is fitted to the curved portion, and the connecting tube is provided with a second engagement portion, the second engagement portion is located in the circumferential direction of the connecting tube, the curved portion is connected to the connecting tube by the first engagement portion snap-fitting to the second engagement portion, and the insertion tube is bonded to the connecting tube.

[0006] The above-described connection structure between the curved section and the insertion tube involves fitting the connecting tube to the curved section during the installation process, snap-fitting the first engagement portion to the second engagement portion, and bonding the insertion tube to the connecting tube. Since the first engagement portion is provided circumferentially on the curved section and the second engagement portion is provided circumferentially on the connecting tube, the connecting tube and the curved section are fitted together and connected by a snap fit. This is advantageous in reducing the probability of the first and second engagement portions breaking under external force, and guarantees the overall structural stability of the connection structure between the curved section and the insertion tube. Furthermore, by bonding the connecting tube to the insertion tube and indirectly connecting the curved section and the insertion tube, it is advantageous in avoiding the risk of the curved section detaching due to insufficient stability that can occur with direct bonding. This also guarantees the stability of the connection between the curved section and the insertion tube, reducing the probability of medical accidents occurring due to the curved section detaching from the insertion tube during endoscope use, and further improving the overall quality of use of the endoscope.

[0007] In one embodiment, there are at least two of each of the first and second engaging portions, the at least two first engaging portions are installed at intervals along the circumferential direction of the curved portion, the at least two second engaging portions are installed at intervals along the circumferential direction of the connecting pipe, and the at least two first engaging portions are installed in one-to-one correspondence with the at least two second engaging portions.

[0008] In one embodiment, the first engaging portion is an engaging column, the second engaging portion is an engaging hole, and the cross-sectional contour of the engaging column matches the opening shape of the engaging hole.

[0009] In one embodiment, the first engaging portion is an engaging hole, the second engaging portion is an engaging column, and the opening shape of the engaging hole matches the cross-sectional contour of the engaging column.

[0010] In one embodiment, the engagement column is provided with a guide slope, which is used to guide the engagement column into the engagement hole.

[0011] In one embodiment, at least two of the engaging posts include at least a first engaging post and a second engaging post, and at least two of the engaging holes include at least a first engaging hole and a second engaging hole, the first engaging post is snap-fitted into the first engaging hole, the second engaging post is snap-fitted into the second engaging hole, the cross-sectional profile of the first engaging post is different from the cross-sectional profile of the second engaging post, and the opening shape of the first engaging hole is different from the opening shape of the second engaging hole.

[0012] In one embodiment, the cross-sectional contour of the first engaging column extends along the axial direction of the curved portion. elongated hole The opening shape of the first engagement hole extends along the axial direction of the connecting pipe. elongated hole The cross-sectional contour of the second engaging column is circular, and the opening shape of the second engaging hole is circular.

[0013] In one embodiment, the curved portion is provided with a first annular connection portion, the first annular connection portion is connected to the curved portion and extends along the axial direction of the curved portion, the first engaging portion is located in the circumferential direction of the first annular connection portion, the connecting pipe is provided with a second annular connection portion, the second annular connection portion is connected to the connecting pipe and extends along the axial direction of the connecting pipe, the second engaging portion is located in the circumferential direction of the second annular connection portion, the outer diameter of the second annular connection portion is smaller than the inner diameter of the first annular connection portion, the first annular connection portion is fitted onto the second annular connection portion, the connecting pipe is joined to the first annular connection portion, and the outer wall of the connecting pipe smoothly transitions with the outer wall of the first annular connection portion.

[0014] In one embodiment, a sealant is applied between the outer wall of the second annular connection and the inner wall of the first annular connection.

[0015] In one embodiment, the curved portion is provided with a first annular connection portion, the first annular connection portion is connected to the curved portion and extends along the axial direction of the curved portion, the first engaging portion is located in the circumferential direction of the first annular connection portion, the connecting pipe is provided with a second annular connection portion, the second annular connection portion is connected to the connecting pipe and extends along the axial direction of the connecting pipe, the second engaging portion is located in the circumferential direction of the second annular connection portion, the outer diameter of the first annular connection portion is smaller than the inner diameter of the second annular connection portion, the second annular connection portion is fitted onto the first annular connection portion, the curved portion is joined to the second annular connection portion, and the outer wall of the curved portion transitions smoothly with the outer wall of the second annular connection portion.

[0016] In one embodiment, a sealant is applied between the outer wall of the first annular connection and the inner wall of the second annular connection.

[0017] In one embodiment, the connecting pipe is further provided with a third annular connector, the third annular connector is connected to the connecting pipe and extends along the axial direction of the connecting pipe, the second annular connector and the third annular connector are located at opposite ends of the connecting pipe, the insertion pipe is provided with a fourth annular connector, the fourth annular connector is connected to the insertion pipe and extends along the axial direction of the insertion pipe, the outer diameter of the fourth annular connector is smaller than the inner diameter of the third annular connector, the third annular connector is fitted onto the fourth annular connector, the insertion pipe is joined to the third annular connector, the outer wall of the insertion pipe smoothly transitions with the outer wall of the third annular connector, and a structural adhesive is applied between the outer wall of the fourth annular connector and the inner wall of the third annular connector.

[0018] The endoscope includes a connecting structure between the bending section and the insertion tube as described in any one of the above items.

[0019] In the above-described endoscope, during the attachment process, the connecting tube is fitted to the curved section, and the first locking section is snap-fitted to the second locking section, thereby bonding the insertion tube to the connecting tube. Since the first locking section is provided circumferentially on the curved section and the second locking section is provided circumferentially on the connecting tube, the connecting tube and the curved section are fitted together and connected by a snap fit, which is advantageous in reducing the probability of the first and second locking sections breaking due to external force, and guarantees the overall structural stability of the connection between the curved section and the insertion tube. Furthermore, by bonding the connecting tube to the insertion tube and indirectly connecting the curved section and the insertion tube, it is advantageous in avoiding the risk of the curved section detaching due to the lack of stability that can occur with direct bonding, and further advantageous in guaranteeing the connection stability between the curved section and the insertion tube, thereby reducing the probability of medical accidents occurring due to the curved section detaching from the insertion tube during use of the endoscope, and further improving the overall quality of use of the endoscope.

[0020] The drawings, which constitute part of this application, are used to provide a further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to interpret the present invention and do not constitute an unreasonable limitation to the present invention. To more clearly illustrate the technical solutions in the embodiments of the present invention, the following is a brief introduction to the drawings that may be used in the description of the embodiments. Clearly, the drawings in the following description represent only some embodiments of the present invention, and those skilled in the art can obtain other drawings from these without any creative work. [Brief explanation of the drawing]

[0021] [Figure 1] This is a schematic diagram of the connection structure between the curved section and the insertion tube after installation, according to one embodiment. [Figure 2] This is an exploded view of the connection structure between the curved section and the insertion tube according to one embodiment. [Modes for carrying out the invention]

[0022] To more clearly understand the above 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 are described in order to fully understand the present invention. However, the present invention can be implemented in many other forms different from the embodiments described herein, and those skilled in the art can 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.

[0023] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "center", "vertical direction", "horizontal direction", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial direction", "radial direction", "circumferential direction", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of making the description of the present invention easier and simplifying the description, and does not mean or imply that the device or element mentioned must have a specific orientation and must be configured and operated in a specific orientation, and should not be construed as limiting the present invention.

[0024] Note that the terms "first" and "second" are for the purpose of description only, and do not mean or imply relative importance or imply the number of the described technical features. Therefore, the features limited by "first" and "second" can include at least one of the features explicitly or implicitly. In the description of the present invention, unless specifically and explicitly limited, the meaning of "plurality" is at least two, for example, two, three, etc.

[0025] In the present invention, unless specifically defined and limited, terms such as "attachment", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated. Also, it may be mechanically connected or electrically connected. Further, it may be directly connected or indirectly connected through an intermediate medium, or it may be the communication inside two elements or the interaction relationship between two elements. The specific meaning of the above terms in the present invention will be understood by those skilled in the art according to specific situations.

[0026] In the present invention, unless specifically defined and limited, when the first feature is "above" or "below" the second feature, the first and second features may be in direct contact, or the first and second features may be in indirect contact through an intermediate medium. Also, when the first feature is "above", "above", and "upper surface" of the second feature, it only indicates that the first feature is directly above or obliquely above the second feature, or the horizontal height of the first feature is greater than that of the second feature. When the first feature is "below", "below", and "lower surface" of the second feature, it only indicates that the first feature is directly below or obliquely below the second feature, or the horizontal height of the first feature is smaller than that of the second feature.

[0027] In addition, when one element is called "fixed to" or "provided on" another element, it may be directly present on the other element, or there may be intervening elements. When one 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", "above", "below", "left", "right" and similar expressions used in this specification are for illustrative purposes only and do not represent the only embodiment.

[0028] In one embodiment, referring to Figures 1 and 2, the connection structure 100 between the curved portion and the insertion tube includes a curved portion 110, a connecting tube 120, and an insertion tube 130. The curved portion 110 is provided with a first engagement portion 111, which is located in the circumferential direction of the curved portion 110. The connecting tube 120 is fitted onto the curved portion 110, and the connecting tube 120 is provided with a second engagement portion 121, which is located in the circumferential direction of the connecting tube 120. The first engagement portion 111 snaps into the second engagement portion 121, thereby connecting the curved portion 110 to the connecting tube 120. The insertion tube 130 is bonded to the connecting tube 120.

[0029] The above-described connection structure 100 between the curved section and the insertion tube involves fitting the connecting tube 120 into the curved section 110 and snap-fitting the first engagement portion 111 into the second engagement portion 121, thereby bonding the insertion tube 130 to the connecting tube 120. Since the first engagement portion 111 is provided in the circumferential direction of the curved section 110 and the second engagement portion 121 is provided in the circumferential direction of the connecting tube 120, the connecting tube 120 and the curved section 110 are fitted together and connected by a snap fit, which is advantageous in reducing the probability of the first engagement portion 111 and the second engagement portion 121 breaking due to external force, and thus guarantees the overall structural stability of the connection structure 100 between the curved section and the insertion tube. Furthermore, by bonding the connecting tube 120 to the insertion tube 130, the bending section 110 and the insertion tube 130 are indirectly connected, which is advantageous in avoiding the risk of the bending section 110 detaching, which is not as stable as direct bonding, and also in ensuring the stability of the connection between the bending section 110 and the insertion tube 130. This reduces the probability of medical accidents occurring due to the bending section 110 detaching from the insertion tube 130 during endoscope use, and further improves the overall quality of use of the endoscope.

[0030] Furthermore, referring to Figures 1 and 2, there are at least two first engaging portions 111 and two second engaging portions 121, with at least two first engaging portions 111 spaced apart along the circumferential direction of the curved portion 110, and at least two second engaging portions 121 spaced apart along the circumferential direction of the connecting pipe 120.

[0031] Specifically, referring to Figure 2, there are four first engagement parts 111, which are spaced apart along the circumferential direction of the curved section 110. There are also four second engagement parts 121, which are spaced apart along the circumferential direction of the connecting pipe 120. This arrangement is advantageous in improving the ease of operation of the snap-fit ​​connection and is convenient for attaching the curved section 110 and the connecting pipe 120. On the other hand, it is advantageous in distributing stress at the connection point, improving the circumferential connection stability of the curved section 110 and the connecting pipe 120, preventing loosening and falling of the curved section 110, and preventing medical accidents from occurring during endoscopic examinations. In this embodiment, only one type of number of first engagement parts 111 and second engagement parts 121 is provided, but the invention is not limited to this.

[0032] Furthermore, referring to Figures 1 and 2, at least two first engagement portions 111 are installed in a one-to-one correspondence with at least two second engagement portions 121. This is advantageous in further improving the circumferential connection stability between the curved portion 110 and the connecting pipe 120.

[0033] In one embodiment (not shown), the first engagement portion 111 is an engagement column 122, and the second engagement portion 121 is an engagement hole 112. The cross-sectional contour of the engagement column 122 matches the opening shape of the engagement hole 112. This connection between the engagement column 122 and the engagement hole 112 is advantageous in ensuring the stability of the snap-fit ​​connection, and the matching shapes of the engagement column 122 and engagement hole 112 are advantageous in avoiding loosening, further improving the overall quality of the endoscope.

[0034] Alternatively, in another embodiment, referring to Figures 1 and 2, the first engagement portion 111 is an engagement hole 112, and the second engagement portion 121 is an engagement column 122, where the opening shape of the engagement hole 112 matches the cross-sectional contour of the engagement column 122. This connection between the engagement column 122 and the engagement hole 112 is advantageous in ensuring the stability of the snap-fit ​​connection, and the matching shapes of the engagement column 122 and engagement hole 112 are advantageous in avoiding loosening, further improving the overall quality of the endoscope.

[0035] In one embodiment, as shown in Figures 1 and 2, the engagement column 122 is provided with a guide slope. The guide slope is used to guide the engagement column 122 into the engagement hole 112. This makes it convenient for the engagement column 122 to enter the engagement hole 112 when connecting the curved section 110 and the connecting pipe 120, improving the convenience of the snap-fit ​​connection between the connecting pipe 120 and the curved section 110.

[0036] In one embodiment, referring to Figures 1 and 2, at least two engagement posts 122 include at least a first engagement post 123 and a second engagement post 124, and at least two engagement holes 112 include at least a first engagement hole 113 and a second engagement hole 114. The first engagement post 123 snaps into the first engagement hole 113, and the second engagement post 124 snaps into the second engagement hole 114. The cross-sectional contour of the first engagement post 123 differs from that of the second engagement post 124, and the opening shape of the first engagement hole 113 differs from that of the second engagement hole 114. By distinguishing the different shapes of the first engagement post 123 and the second engagement post 124 in this way, it is advantageous that the curved portion 110 is connected to the connecting tube 120 in a certain direction, avoids misaligned connection between the curved portion 110 and the connecting tube 120, and is advantageous in improving the overall quality of the endoscope.

[0037] Specifically, there is one first engagement post 123 and three second engagement posts 124, with the one first engagement post 123 and the three second engagement posts 124 spaced apart and positioned circumferentially around the connecting pipe 120. Correspondingly, there is one first engagement hole 113 and three second engagement holes 114, with the one first engagement hole 113 and the three second engagement holes 114 spaced apart and positioned circumferentially around the curved section 110. In this way, the curved section 110 is prevented from being installed in reverse during installation, and further improves the convenience and efficiency of installing the curved section 110.

[0038] In one embodiment, referring to Figures 1 and 2, the cross-sectional contour of the first engaging column 123 extends in the axial direction of the curved portion 110. elongated holeThe opening shape of the first engagement hole 113 extends along the axial direction of the connecting pipe 120. elongated hole The cross-sectional contour of the second engagement column 124 is circular, and the opening shape of the second engagement hole 114 is circular. In this embodiment, only one shape of the engagement column 122 and engagement hole 112 is provided, but the embodiment is not limited thereto.

[0039] Furthermore, in order to understand and explain the axial direction of the curved section 110, using Figure 2 as an example, the axial direction of the curved section 110 is the direction indicated by one of the arrows on the straight line S1 in Figure 2. Note that the connecting pipe 120 and the curved section 110 are connected coaxially. The insertion pipe 130 and the connecting pipe 120 are connected coaxially.

[0040] Specifically, referring to Figures 1 and 2, the curved section 110 is made of POM (polymethanol), the connecting tube 120 is made of PC (polycarbonate) tube, and the insertion tube 130 is made of braided tube. Thus, the manufacturing material costs are low, and it is non-toxic and harmless, which is advantageous in reducing production costs and improving the economic effect of the product, while at the same time avoiding secondary injuries such as allergies and improving the quality of use of the endoscope. In this embodiment, only one type of material is provided for the curved section 110, the connecting tube 120, and the insertion tube 130, but it is not limited to this.

[0041] In one embodiment, referring to Figure 2, the curved portion 110 is provided with a first annular connector 115, the first annular connector 115 is connected to the curved portion 110 and extends along the axial direction of the curved portion 110, the first engaging portion 111 is located in the circumferential direction of the first annular connector 115, the connecting pipe 120 is provided with a second annular connector 125, the second annular connector 125 is connected to the connecting pipe 120 and extends along the axial direction of the connecting pipe 120, the second engaging portion 121 is located in the circumferential direction of the second annular connector 125, the outer diameter of the second annular connector 125 is smaller than the inner diameter of the first annular connector 115, the first annular connector 115 is fitted onto the second annular connector 125, the connecting pipe 120 is joined to the first annular connector 115, and the outer wall of the connecting pipe 120 transitions smoothly with the outer wall of the first annular connector 115. Thus, after the curved section 110 is connected to the connecting tube 120, the outer walls of both transition smoothly, which is advantageous in improving the smoothness of the structure, avoiding damage to organ tissue when entering the human body, and further improving the overall quality of use of the endoscope.

[0042] Furthermore, a sealant is provided between the outer wall of the second annular connector 125 and the inner wall of the first annular connector 115. In this way, the first annular connector 115 and the second annular connector 125 are connected by a snap fit, with adhesive assistance, which is advantageous in further improving the connection stability between the curved tip 110 and the connecting tube 120, preventing the curved tip 110 from detaching from the connecting tube 120, ensuring airtightness, and further improving the overall quality of the endoscope.

[0043] In other embodiments, the curved portion 110 is provided with a first annular connector 115, which is connected to the curved portion 110 and extends along the axial direction of the curved portion 110, and the first engaging portion 111 is located in the circumferential direction of the first annular connector 115. The connecting pipe 120 is provided with a second annular connector 125, which is connected to the connecting pipe 120 and extends along the axial direction of the connecting pipe 120, and the second engaging portion 121 is located in the circumferential direction of the second annular connector 125. The outer diameter of the first annular connector 115 is smaller than the inner diameter of the second annular connector 125, the second annular connector 125 is fitted onto the first annular connector 115, the curved portion 110 is joined to the second annular connector 125, and the outer wall of the curved portion 110 transitions smoothly with the outer wall of the second annular connector 125. Thus, after the curved section 110 is connected to the connecting tube 120, the outer walls of both transition smoothly, which is advantageous in improving the smoothness of the structure, avoiding damage to organ tissue when entering the human body, and further improving the overall quality of use of the endoscope.

[0044] Furthermore, sealant is applied between the outer wall of the first annular connector 115 and the inner wall of the second annular connector 125. The first annular connector 115 and the second annular connector 125 are connected by a combination of snap-fit ​​connection and adhesive bonding, which is advantageous in further improving the connection stability between the curved section 110 and the connecting tube 120, further preventing the curved section 110 from detaching from the connecting tube 120, ensuring airtightness, and further improving the overall quality of the endoscope.

[0045] In one embodiment, referring to Figure 2, the connecting pipe 120 is further provided with a third annular connecting portion 126, which is connected to the connecting pipe 120 and extends along the axial direction of the connecting pipe 120, and the second annular connecting portion 125 and the third annular connecting portion 126 are located at opposite ends of the connecting pipe 120, and the insertion pipe 130 is provided with a fourth annular connecting portion 131, which is connected to the insertion pipe 130 and inserts The fourth annular connector 131 extends along the axial direction of the insertion tube 130, and its outer diameter is smaller than the inner diameter of the third annular connector 126. The third annular connector 126 is fitted onto the fourth annular connector 131, and the insertion tube 130 is joined to the third annular connector 126. The outer wall of the insertion tube 130 transitions smoothly with the outer wall of the third annular connector 126, and structural adhesive is applied between the outer wall of the fourth annular connector 131 and the inner wall of the third annular connector 126. This further enhances structural smoothness, avoids damaging organ tissue when entering human organs, and improves the overall quality of use of the endoscope.

[0046] In one embodiment, the endoscope (not shown) includes a connection structure 100 between the bending section and the insertion tube according to the above embodiment.

[0047] In the process of attaching the above endoscope, the connecting tube 120 is fitted onto the curved section 110, and the first engagement portion 111 is snap-fitted onto the second engagement portion 121, thereby bonding the insertion tube 130 to the connecting tube 120. Since the first engagement portion 111 is provided in the circumferential direction of the curved section 110 and the second engagement portion 121 is provided in the circumferential direction of the connecting tube 120, the connecting tube 120 and the curved section 110 are fitted together and connected by a snap fit, which is advantageous in reducing the probability of the first engagement portion 111 and the second engagement portion 121 breaking due to external force, and guarantees the overall structural stability of the connection structure 100 between the curved section and the insertion tube. Furthermore, by bonding the connecting tube 120 to the insertion tube 130, the bending section 110 and the insertion tube 130 are indirectly connected, which is advantageous in avoiding the risk of the bending section 110 detaching, which is not as stable as direct bonding, and also in ensuring the stability of the connection between the bending section 110 and the insertion tube 130. This reduces the probability of medical accidents occurring due to the bending section 110 detaching from the insertion tube 130 during endoscope use, and further improves the overall quality of use of the endoscope.

[0048] The technical features of the embodiments described above can be combined in any way, and for the sake of brevity, not all possible combinations of the technical features in the embodiments described above have been explained. However, as long as these combinations of technical features are not contradictory, they should be considered to fall within the scope described herein.

[0049] The above embodiments merely illustrate some of the embodiments of the present invention, and although the descriptions are specific and detailed, they should not be understood as limiting the scope of the invention. Those skilled in the art should note that several modifications and improvements within the scope of the present invention can be made without departing from the spirit of the present invention. Therefore, the scope of the patent of the present invention shall be as defined by the attached claims. [Explanation of Symbols]

[0050] 100 Connection structure between curved section and insertion tube, 110 Curved section, 111 First engagement section, 112 Engagement hole, 113 First engagement hole, 114 Second engagement hole, 115 First annular connection section, 120 Connecting tube, 121 Second engagement section, 122 Engagement column, 123 First engagement column, 1231 Guide slope, 124 Second engagement column, 125 Second annular connection section, 126 Third annular connection section, 130 Insertion tube, 131 Fourth annular connection section

Claims

1. A connection structure between a curved portion and an insertion tube, comprising a curved portion, a connecting tube, and an insertion tube, The curved portion is provided with a first engagement portion, and the first engagement portion is located in the circumferential direction of the curved portion. The connecting pipe is fitted to the curved portion, and the connecting pipe is provided with a second engagement portion, the second engagement portion is located in the circumferential direction of the connecting pipe, and the first engagement portion snaps into the second engagement portion, thereby connecting the curved portion to the connecting pipe, and the insertion pipe is bonded to the connecting pipe. The first and second engaging portions each consist of at least two, the at least two first engaging portions are spaced apart along the circumferential direction of the curved portion, the at least two second engaging portions are spaced apart along the circumferential direction of the connecting pipe, and the at least two first engaging portions are installed in one-to-one correspondence with the at least two second engaging portions. The first engagement portion is an engagement column, the second engagement portion is an engagement hole, the cross-sectional contour of the engagement column matches the opening shape of the engagement hole, in this case the curved portion is provided with a first annular connecting portion, the first annular connecting portion is connected to the curved portion and extends along the axial direction of the curved portion, the first engagement portion is located in the circumferential direction of the first annular connecting portion, the connecting pipe is provided with a second annular connecting portion, the second annular connecting portion is connected to the connecting pipe and extends along the axial direction of the connecting pipe It extends in a direction and is configured as a closed annular shape, the second engaging portion is located in the circumferential direction of the second annular connection portion, the outer diameter of the first annular connection portion is smaller than the inner diameter of the second annular connection portion, the second annular connection portion is fitted onto the first annular connection portion, the curved portion is joined to the second annular connection portion, the outer wall of the curved portion smoothly transitions with the outer wall of the second annular connection portion, and sealant is applied between the outer wall of the first annular connection portion and the inner wall of the second annular connection portion. Or, The first engagement portion is an engagement hole, the second engagement portion is an engagement column, the opening shape of the engagement hole matches the cross-sectional contour of the engagement column, in this case the curved portion is provided with a first annular connecting portion, the first annular connecting portion is connected to the curved portion and extends along the axial direction of the curved portion and is configured as a closed annulus, the first engagement portion is located in the circumferential direction of the first annular connecting portion, the connecting pipe is provided with a second annular connecting portion, the second annular connecting portion is connected to the connecting pipe and the connecting A connection structure between a curved portion and an insertion tube, characterized in that the second engaging portion extends along the axial direction of the connecting tube, the second engaging portion is located in the circumferential direction of the second annular connection portion, the outer diameter of the second annular connection portion is smaller than the inner diameter of the first annular connection portion, the first annular connection portion is fitted onto the second annular connection portion, the connecting tube is joined to the first annular connection portion, the outer wall of the connecting tube smoothly transitions with the outer wall of the first annular connection portion, and sealant is applied between the outer wall of the second annular connection portion and the inner wall of the first annular connection portion.

2. The connection structure between a curved portion and an insertion tube according to claim 1, characterized in that the engagement column is provided with a guide slope, and the guide slope is used to guide the engagement column into the engagement hole.

3. The connection structure between a curved portion and an insertion tube according to claim 1, characterized in that at least two of the engaging columns include at least a first engaging column and a second engaging column, at least two of the engaging holes include at least a first engaging hole and a second engaging hole, the first engaging column is snap-fitted into the first engaging hole, the second engaging column is snap-fitted into the second engaging hole, the cross-sectional contour of the first engaging column differs from the cross-sectional contour of the second engaging column, and the opening shape of the first engaging hole differs from the opening shape of the second engaging hole.

4. The connection structure between a curved portion and an insertion pipe according to claim 3, characterized in that the cross-sectional contour of the first engaging column is elongated and extends along the axial direction of the curved portion, the opening shape of the first engaging hole is elongated and extends along the axial direction of the connecting pipe, the cross-sectional contour of the second engaging column is circular, and the opening shape of the second engaging hole is circular.

5. The connection structure between a curved portion and an insertion tube according to claim 1, characterized in that the connecting tube is further provided with a third annular connecting portion, the third annular connecting portion is connected to the connecting tube and extends along the axial direction of the connecting tube, the second annular connecting portion and the third annular connecting portion are located at opposite ends of the connecting tube, the insertion tube is provided with a fourth annular connecting portion, the fourth annular connecting portion is connected to the insertion tube and extends along the axial direction of the insertion tube, the outer diameter of the fourth annular connecting portion is smaller than the inner diameter of the third annular connecting portion, the third annular connecting portion is fitted onto the fourth annular connecting portion, the insertion tube is joined to the third annular connecting portion, the outer wall of the insertion tube transitions smoothly with the outer wall of the third annular connecting portion, and a structural adhesive is applied between the outer wall of the fourth annular connecting portion and the inner wall of the third annular connecting portion.

6. The connection structure between a curved portion and an insertion tube according to claim 1, characterized in that the connecting tube is further provided with a third annular connecting portion, the third annular connecting portion is connected to the connecting tube and extends along the axial direction of the connecting tube, the second annular connecting portion and the third annular connecting portion are located at opposite ends of the connecting tube, the insertion tube is provided with a fourth annular connecting portion, the fourth annular connecting portion is connected to the insertion tube and extends along the axial direction of the insertion tube, the outer diameter of the fourth annular connecting portion is smaller than the inner diameter of the third annular connecting portion, the third annular connecting portion is fitted onto the fourth annular connecting portion, the insertion tube is joined to the third annular connecting portion, the outer wall of the insertion tube transitions smoothly with the outer wall of the third annular connecting portion, and a structural adhesive is applied between the outer wall of the fourth annular connecting portion and the inner wall of the third annular connecting portion.

7. An endoscope characterized by including a connection structure between a curved portion and an insertion tube as described in any one of claims 1 to 6.

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