Three-way connector and endoscope

Abstract

Disclosed are a three-way connector and an endoscope. The endoscope comprises a base body (10). A proximal end of the base body (10) is provided with a negative pressure channel (110) and an instrument channel (120). A distal end of the base body (10) is provided with a docking channel (130). The instrument channel (120) comprises an insertion section (121), a first arc-shaped bending section (122), and a second arc-shaped bending section (123), which are sequentially arranged from the proximal end to the distal end. An opening direction of the first arc-shaped bending section (122) faces toward the negative pressure channel (110). An opening direction of the second arc-shaped bending section (123) faces away from the negative pressure channel (110). A distal end of the second arc-shaped bending section (123) is in communication with the negative pressure channel (110). By performing two mirror-image reversals on a disposal instrument by means of the instrument channel (120), the disposal instrument can penetrate into the negative pressure channel (110) at a small entry angle; for the negative pressure channel (110) and docking channel (130) which are coaxially arranged, correspondingly, the disposal instrument can also penetrate into the docking channel (130) at a small entry angle, thereby reducing the number of bending deformations of the disposal instrument in the docking channel (130) and the insertion portion, and lowering the loading resistance and difficulty of the disposal instrument.

Description

Three-way connector and endoscope Technical Field

[0001] The present invention relates to the technical field of endoscopes, and in particular to a three-way connector and an endoscope. Background Art

[0002] As one of the important medical devices in modern surgical operations, the endoscope includes an operating handle and an insertion part. The insertion part can enter the human body through the human cavity or surgical incision, and the camera module at the far end of the insertion part helps the doctor to determine the location of the lesion in the patient's body and the tissue structure characteristics of the lesion location; the operating handle is provided with a three-way connector, which includes a negative pressure channel, an instrument channel, and a docking channel connected to the insertion part, so that the negative pressure channel and the insertion part can cooperate to extract the accumulated fluid in the body cavity, and the instrument channel and the insertion part can cooperate to insert the treatment instrument to sample the human tissue or deliver therapeutic substances.

[0003] However, in the process of realizing the present invention, the applicant discovered that when inserting the treatment instrument through the instrument channel, the insertion resistance of the treatment instrument is large, which affects the normal use of the treatment instrument. Summary of the Invention

[0004] The purpose of this application is to provide a three-way connector and an endoscope to solve the above technical problems existing in the prior art, mainly including the following two aspects:

[0005] The first aspect of the present application provides a three-way connector for an endoscope, comprising a base body, a negative pressure channel and an instrument channel being provided at the proximal end of the base body, and a docking channel being provided at the distal end of the base body, the distal end of the docking channel being used to connect with the insertion part of the endoscope, the proximal end of the negative pressure channel being used to connect with a negative pressure source, the distal end of the negative pressure channel being connected with the proximal end of the docking channel, the instrument channel comprising an insertion section, a first arc-shaped curved section and a second arc-shaped curved section being arranged in sequence from the proximal end to the distal end, the proximal end port of the insertion section being used to insert a disposal instrument, the angle between the axis of the insertion section and the axis of the negative pressure channel being an acute angle, the opening direction of the first arc-shaped curved section being toward the negative pressure channel, the opening direction of the second arc-shaped curved section being away from the negative pressure channel, the distal end of the second arc-shaped curved section being connected with the negative pressure channel, and the distal end of the second arc-shaped curved section being close to the proximal end of the docking channel.

[0006] Furthermore, the circle corresponding to the axis of the second arc-shaped curved section is tangent to the axis of the docking channel.

[0007] Furthermore, the negative pressure channel and the docking channel are coaxially arranged.

[0008] Furthermore, the circle corresponding to the axis of the first arc-shaped curved segment is tangent to the circle corresponding to the axis of the second arc-shaped curved segment;

[0009] And / or, the axis of the insertion segment is tangent to a circle corresponding to the axis of the first arc-shaped curved segment.

[0010] Furthermore, the curvature of the first curved segment is smaller than the curvature of the second curved segment;

[0011] And / or, the diameter corresponding to the first arc-shaped curved section is smaller than the diameter corresponding to the second arc-shaped curved section.

[0012] Furthermore, the angle between the axis of the insertion section and the axis of the negative pressure channel is 30° to 50°;

[0013] And / or, the corresponding diameter of the first arc-shaped curved segment is 1 / 2 of the corresponding diameter of the second arc-shaped curved segment.

[0014] Furthermore, a transition channel is provided in the base, and the distal end of the negative pressure channel is connected with the proximal end of the docking channel through the transition channel, and the transition channel is used to achieve a smooth transition between the negative pressure channel and the docking channel.

[0015] Furthermore, the curvature of the second arc-shaped curved section on the side close to the negative pressure channel is greater than the curvature of the second arc-shaped curved section on the side away from the negative pressure channel.

[0016] Furthermore, the inner wall of the second arc-shaped curved section close to the negative pressure channel corresponds to a circle passing through the inner wall of the transition channel.

[0017] A second aspect of the present application provides an endoscope, comprising a handle, an insertion portion and the above-mentioned three-way connector, wherein the three-way connector is arranged at the distal end of the handle, and the distal end of the docking channel is connected to the proximal end of the insertion portion.

[0018] Compared with the prior art, the present invention has at least the following technical effects:

[0019] The present invention performs two mirror-image rotations on the treatment instrument through the instrument channel, so that the treatment instrument can penetrate into the negative pressure channel based on a small entry angle. For the coaxially arranged negative pressure channel and docking channel, the treatment instrument can also penetrate into the docking channel based on a small entry angle, thereby reducing the number of times the treatment instrument bends and deforms in the docking channel and the insertion part, reducing the resistance and difficulty of installing the treatment instrument, and increasing the convenience and safety of using the endoscope. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments of the present invention or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] FIG1 is a schematic structural diagram of a three-way connector according to the present invention;

[0022] FIG2 is a side view of the three-way connector of the present invention;

[0023] FIG3 is a cross-sectional view taken along line AA in FIG2 (indicating the channel axis);

[0024] FIG4 is a schematic diagram of the connection of the internal channel of the three-way connector of the present invention (marking the circle corresponding to the axis of the instrument channel);

[0025] FIG5 is a schematic diagram of the connection of the internal channel of the three-way connector of the present invention (indicating the insertion path of the treatment instrument);

[0026] FIG6 is a schematic diagram of the connection of the internal channel of a conventional three-way connector (indicating the insertion path of the treatment instrument);

[0027] FIG7 is a partial enlarged view of point D in FIG6;

[0028] FIG8 is a schematic structural diagram of an endoscope according to the present invention;

[0029] In the figure,

[0030] 10. Base; 110. Negative pressure channel; 120. Instrument channel; 121. Insertion section; 122. First arc-shaped curved section; 123. Second arc-shaped curved section; 130. Docking channel; 140. Transition channel; 20. Handle; 30. Insertion part. DETAILED DESCRIPTION

[0031] The following description provides many different embodiments or examples for implementing different features of the present invention. The components and arrangements described in the following specific examples are only used to simplify the present invention and are only used as examples, not to limit the present invention.

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention for which protection is sought, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0033] In the present invention, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be understood broadly. For example, they can refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and they can refer to internal connectivity between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances. Furthermore, terms such as "first," "second," and "third" are used solely for descriptive purposes and are not to be construed as indicating or implying relative importance.

[0034] In the present invention, unless otherwise expressly specified or limited, a first feature being above or below a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being above, above, and above the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being below, below, and below the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0035] In addition, in the present invention, "proximal" and "distal" refer to the far and near positions of the structure relative to the human body in the use environment, so as to facilitate the description of the positional relationship between components and facilitate understanding; for the same component, "proximal" and "distal" are the relative positional relationship of the component, not absolute; therefore, it should be understood from the perspective of realizing the principles of the present invention, and should not deviate from the essence of the present invention.

[0036] As one of the important medical devices in modern surgical operations, the endoscope includes an operating handle and an insertion part. The insertion part can enter the human body through the human cavity or surgical incision. By toggling the lever on the operating handle, the active bending section at the distal end of the insertion part can be driven to adjust its posture. The camera module at the distal end of the insertion part can observe the internal tissues of the human body and help doctors determine the location of the lesion in the patient's body and the tissue structure characteristics of the lesion location; and a three-way connector is provided on the operating handle. The three-way connector includes a negative pressure channel, an instrument channel, and a docking channel connected to the insertion part. During use, when it is necessary to treat the accumulated fluid in the body cavity, the negative pressure source can be connected to the negative pressure channel so that the accumulated fluid in the body cavity can be extracted through the cooperation of the negative pressure channel and the insertion part. When it is necessary to sample human tissue or deliver therapeutic substances to the human body, the treatment instrument can be inserted through the instrument channel, and reach the target position in the body cavity through the insertion part to sample human tissue or deliver therapeutic substances.

[0037] In the prior art, in order to avoid blockage during the negative pressure suction process, the negative pressure channel and the docking channel are generally coaxially arranged. In order to facilitate the insertion of the treatment instrument into the instrument channel, it is necessary not only to control the extension direction of the proximal port of the instrument channel, but also to control the angle between the instrument channel and the negative pressure channel to ensure that the proximal port of the instrument channel has sufficient and reasonable operating space, and the human body or the endoscope handle will not interfere with the insertion process when the treatment instrument is inserted; on the other hand, when the treatment instrument is inserted through the instrument channel, as shown in Figures 6 and 7, since the existing instrument channel 120 is connected to the docking channel 130 through the negative pressure channel 110, after the treatment instrument enters the instrument channel 120, the treatment instrument and the negative pressure channel 110 are connected. There is an initial angle between them, and then when the disposal instrument enters the negative pressure channel 110 from the instrument channel 120, the disposal instrument will inevitably collide with the inner wall of the negative pressure channel 110, resulting in a bend, and the forward direction of the disposal instrument is mirror-reversed, and after the one bend, the initial angle between the disposal instrument and the negative pressure channel 110 is maintained. Correspondingly, during the subsequent insertion process of the disposal instrument, the initial angle will be used as the entry angle β, and it will be obliquely inserted into the docking channel 130. The larger the entry angle β, the more times the disposal instrument will abut and bend against the inner wall of the channel per unit length, causing the disposal instrument to undergo multiple sections of bending deformation in the docking channel 130 and the insertion part, increasing the resistance and difficulty of loading the disposal instrument, and affecting the normal use of the disposal instrument. In order to solve the problem of the three-way connector affecting the loading of the disposal instrument, the present application provides a three-way connector and endoscope that can reduce the difficulty of loading the disposal instrument. The specific structure is shown in the following embodiments.

[0038] Example 1:

[0039] The embodiment of the present application provides a three-way connector for an endoscope, as shown in Figures 1 to 3, comprising a base 10, a negative pressure channel 110 and an instrument channel 120 are provided at the proximal end of the base 10, and a docking channel 130 is provided at the distal end of the base 10. The distal end of the docking channel 130 is used to connect with the insertion portion of the endoscope, the proximal end of the negative pressure channel 110 is used to connect with the negative pressure source, the distal end of the negative pressure channel 110 is connected to the proximal end of the docking channel 130, and the instrument channel 120 includes an insertion section 110 and an insertion section 120 arranged in sequence from the proximal end to the distal end. 21. A first arc-shaped curved segment 122 and a second arc-shaped curved segment 123. The proximal port of the insertion segment 121 is used to insert a disposal instrument. The angle between the axis of the insertion segment 121 and the axis of the negative pressure channel 110 is an acute angle. The opening direction of the first arc-shaped curved segment 122 is toward the negative pressure channel 110, and the opening direction of the second arc-shaped curved segment 123 is away from the negative pressure channel 110. The distal end of the second arc-shaped curved segment 123 is connected to the negative pressure channel 110, and the distal end of the second arc-shaped curved segment 123 is close to the proximal end of the docking channel 130.

[0040] 5, the treatment instrument is allowed to enter from the insertion section 121 port of the instrument channel 120. During the entry process, the treatment instrument is controlled to stick to the insertion section 121 port close to the inner wall of the negative pressure channel 110, so that the treatment instrument sticks to the inner wall of the insertion section 121 port and faces the first curved section 122 to enter the first curved section 122, so that the angle (first angle) between the forward direction of the treatment instrument and the negative pressure channel 110 is kept as small as possible in the initial entry state, and the treatment instrument is prevented from bending and deforming in the insertion section 121, so that the treatment instrument abuts against the inner wall of the first curved section 122 based on a larger abutment angle. Under the abutment effect of the inner wall of the first curved section 122, the treatment instrument is prompted to bend at a larger angle at the point where it abuts against the inner wall of the first curved section 122, thereby increasing the angle (second angle) between the forward direction of the treatment instrument and the negative pressure channel 110 after the first bending; and then The treatment instrument continues to advance and enters the second arc-shaped curved section 123. Since the bending directions of the second arc-shaped curved section 123 and the first arc-shaped curved section 122 diverge from each other, after entering the second arc-shaped curved section 123, the treatment instrument abuts against the inner wall of the second arc-shaped curved section 123 on the side close to the negative pressure channel 110 and bends a second time, thereby reversing the forward direction of the treatment instrument. This reduces the angle (a third angle, which is much smaller than the first angle) between the forward direction of the treatment instrument and the negative pressure channel after the second bend, so that the treatment instrument can penetrate into the negative pressure channel 110 based on a small entry angle (the third angle). For the coaxially arranged negative pressure channel 110 and docking channel 130, the treatment instrument can also penetrate into the docking channel 130 based on a small entry angle (the third angle), thereby reducing the number of times the treatment instrument is bent and deformed in the docking channel 130 and / or the insertion portion, reducing the resistance and difficulty of inserting the treatment instrument, and increasing the convenience and safety of using the endoscope.

[0041] In order to further reduce the number of times the treatment instrument is bent and deformed in the docking channel 130 and / or the insertion portion, as shown in Figure 4, the circle corresponding to the axis of the second arc-shaped bending section 123 can be set to be tangent to the axis of the docking channel 130. When the second arc-shaped bending section 123 is tangent to the docking channel 130, the treatment instrument can be guided by the second arc-shaped bending section 123 and enter the negative pressure channel 110 in a state that is almost parallel or completely parallel to the axis of the negative pressure channel 110. Even after entering, the treatment instrument can maintain coaxial advancement with the negative pressure channel 110, and thus the treatment instrument will not directly collide in the docking channel 130 and the insertion portion, thereby further reducing the loading resistance and difficulty of the treatment instrument and improving the convenience of using the endoscope.

[0042] In some embodiments, the second arc-shaped curved section 123 can be set so that the circle corresponding to the inner wall of the negative pressure channel 110 is tangent to the axis of the docking channel 130, thereby reducing the number of times the treatment instrument bends and deforms in the docking channel 130 and / or the insertion part, thereby reducing the difficulty of installing the treatment instrument.

[0043] In some embodiments, the second arc-shaped curved section 123 can be set to be tangent to the axis of the docking channel 130 on the circle corresponding to the inner wall away from the negative pressure channel 110, thereby reducing the number of times the treatment instrument bends and deforms in the docking channel 130 and / or the insertion part, thereby reducing the difficulty of installing the treatment instrument.

[0044] Specifically, the negative pressure channel 110 and the docking channel 130 are coaxially arranged to improve the stability and safety of the negative pressure suction operation and avoid clogging of the sample in the three-way connector.

[0045] In order to reduce the resistance of the treatment instrument to pass through the instrument channel 120, as shown in Figure 4, the circle corresponding to the axis of the first arc-shaped curved section 122 can be set to be tangent to the circle corresponding to the axis of the second arc-shaped curved section 123; based on this structure, after the treatment instrument abuts against the inner wall of the first arc-shaped curved section 122 and bends once, under the guidance of the first arc-shaped curved section 122, the treatment instrument is prompted to quickly enter the second arc-shaped curved section 123 to undergo a secondary bending deformation, and it is ensured that the secondary bending deformation mainly mirrors the forward direction of the treatment instrument.

[0046] In order to reduce the insertion resistance of the disposal instrument, the circle corresponding to the axis of the insertion section 121 and the axis of the first arc-shaped curved section 122 can be set to be tangent. Based on this structure, when the disposal instrument enters the insertion section 121 port of the instrument channel 120, the disposal instrument is controlled to stick to the insertion section 121 port close to the inner wall of the negative pressure channel 110, so that the disposal instrument sticks to the inner wall of the insertion section 121 port and faces the first arc-shaped curved section 122 and enters the first arc-shaped curved section 122. This not only avoids the disposal instrument from bending and deforming in the insertion section 121, but also keeps the angle between the forward direction of the disposal instrument and the negative pressure channel 110 as small as possible in the initial entry state, so as to reduce the entry angle of the disposal instrument into the docking channel 130, and the number of times the disposal instrument bends and deforms in the docking channel 130 and / or the insertion part, thereby reducing the insertion resistance and difficulty of the disposal instrument.

[0047] In order to further reduce the insertion resistance of the disposal instrument, the corresponding curvature of the first arc-shaped bending section 122 can be set to be smaller than the corresponding curvature of the second arc-shaped bending section 123, so that the length of the second arc-shaped bending section 123 can be extended within the limited space of the three-way connector, so that the second arc-shaped bending section 123 can guide the disposal instrument for a longer time, so that the disposal instrument can minimize the entry angle when entering the negative pressure channel 110; further, the corresponding diameter of the first arc-shaped bending section 122 is smaller than the corresponding diameter of the second arc-shaped bending section 123. In the limited space of the three-way connector, the length of the first arc-shaped bending section 122 is reduced. On the basis of ensuring that the first arc-shaped bending section 122 achieves a one-time bending effect on the disposal instrument, the length of the second arc-shaped bending section 123 is extended as much as possible, so as to further increase the bending deformation guiding length and guiding time of the second arc-shaped bending section 123 on the disposal instrument, thereby ensuring the stability of the insertion direction of the disposal instrument.

[0048] In some embodiments, the first arc-shaped curved segment 122 preferably has an arc angle of 25°~35°, and the second arc-shaped curved segment 123 preferably has an arc angle of 45°~55°; the ratio of the diameter corresponding to the first arc-shaped curved segment 122 and the diameter corresponding to the second arc-shaped curved segment 123 is 1:1.8~2.2; in this embodiment, the diameter corresponding to the first arc-shaped curved segment 122 is preferably 1 / 2 of the diameter corresponding to the second arc-shaped curved segment 123.

[0049] In order to ensure that the proximal port of the instrument channel 120 has ample and reasonable operating space and that the human body or the endoscope handle does not interfere with the insertion process when inserting the treatment instrument, the angle between the axis of the insertion section 121 and the axis of the negative pressure channel 110 can be set to 30°~50°, thereby improving the convenience of inserting the treatment instrument and reducing the difficulty of insertion.

[0050] In order to reduce the impact of the diameter change between the docking channel 130 and the negative pressure channel 110 on the loading process of the disposal instrument, as shown in Figures 3 to 5, a transition channel 140 can be further provided in the base 10. The distal end of the negative pressure channel 110 is connected to the proximal end of the docking channel 130 through the transition channel 140. The transition channel 140 is used to achieve a smooth transition between the negative pressure channel 110 and the docking channel 130, and the transition channel 140 is used to guide the disposal instrument to quickly enter the docking channel 130 from the negative pressure channel 110.

[0051] In order to prevent the absorbed material from being sucked into the instrument channel 120 during the suction process, the curvature of the second curved section 123 close to the negative pressure channel 110 can be greater than the curvature of the second curved section 123 away from the negative pressure channel 110, thereby reducing the distal port size of the second curved section 123. This can not only reduce the probability of the absorbed material entering the instrument channel 120, but also gradually guide the disposal instrument to gradually coincide with the axis of the second curved section 123 during the process of passing through the second curved section 123, especially when the circle corresponding to the axis of the second curved section 123 is tangent to the axis of the negative pressure channel 110, so that the disposal instrument is guided to coincide with the axis of the negative pressure channel 110 when passing through the second curved section 123, thereby ensuring that the disposal instrument can pass through the negative pressure channel 110 and the docking channel 130 without hindrance and be quickly and safely installed in the insertion part.

[0052] In order to improve the convenience for operators to load the treatment instrument, the second arc-shaped curved section 123 can be passed through the inner wall of the transition channel 140 close to the corresponding circle of the inner wall of the negative pressure channel 110. Even if the operator makes an error in the process of loading the treatment instrument, increasing the entry angle of the treatment instrument into the negative pressure channel 110, the inner wall of the transition channel 140 can be used to guide the treatment instrument so that the treatment instrument can quickly and stably enter the docking channel 130 and be loaded into the insertion part.

[0053] Example 2:

[0054] An embodiment of the present application provides an endoscope, as shown in Figure 8, comprising a handle 20, an insertion portion 30 and the three-way connector in Example 1, wherein the three-way connector is arranged at the distal end of the handle 20, and the distal end of the docking channel 130 is connected to the proximal end of the insertion portion 30.

[0055] When inserting the treatment instrument, the treatment instrument passes through the insertion section 121, the first arc-shaped curved section 122, and the second arc-shaped curved section 123 of the instrument channel 120 in sequence, and enters the proximal end of the insertion part 30 through the docking channel 130, and exits from the distal end of the insertion part 30, thereby processing the human tissue; when sucking the absorbent in the body cavity, the absorbent is sucked at the distal end of the insertion part 30, and then passes through the proximal end of the insertion part 30, the docking channel 130 and the negative pressure channel 110 in sequence to realize the suction of the absorbent.

[0056] It should be noted that the endoscope in the embodiments of the present application can be a bronchoscope, a pyeloscope, an esophagoscope, a gastroscope, a colonoscope, an otoscope, a rhinoscope, a stomatoscope, a laryngoscope, a colposcope, a laparoscope, an arthroscope, etc. The embodiments of the present application do not impose any specific restrictions on the type of endoscope.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A three-way connector for an endoscope, characterized in that: The invention comprises a base body (10), wherein the proximal end of the base body (10) is provided with a negative pressure channel (110) and an instrument channel (120), and the distal end of the base body (10) is provided with a docking channel (130), wherein the distal end of the docking channel (130) is used to be connected to an insertion portion (30) of an endoscope, and the proximal end of the negative pressure channel (110) is used to be connected to a negative pressure source, and the distal end of the negative pressure channel (110) is connected to the proximal end of the docking channel (130), and the instrument channel (120) comprises an insertion section (121), a first arc-shaped curved section (122) and a plurality of other sections which are arranged in sequence from the proximal end to the distal end. and a second arc-shaped curved section (123), the proximal end port of the insertion section (121) being used for inserting a treatment instrument, the angle between the axis of the insertion section (121) and the axis of the negative pressure channel (110) being an acute angle, the opening direction of the first arc-shaped curved section (122) being towards the negative pressure channel (110), the opening direction of the second arc-shaped curved section (123) being away from the negative pressure channel (110), the distal end of the second arc-shaped curved section (123) being in communication with the negative pressure channel (110), and the distal end of the second arc-shaped curved section (123) being close to the proximal end of the docking channel (130).

2. The three-way connector according to claim 1, characterized in that: The circle corresponding to the axis of the second arc-shaped curved section (123) is tangent to the axis of the docking channel (130).

3. The three-way connector according to claim 2, characterized in that: The negative pressure channel (110) and the docking channel (130) are coaxially arranged.

4. The three-way connector according to claim 2, characterized in that: The circle corresponding to the axis of the first arc-shaped curved section (122) is tangent to the circle corresponding to the axis of the second arc-shaped curved section (123); And / or, the axis of the insertion section (121) is tangent to a circle corresponding to the axis of the first arc-shaped curved section (122).

5. The three-way connector according to claim 4, characterized in that: The curvature corresponding to the first arc-shaped curved section (122) is smaller than the curvature corresponding to the second arc-shaped curved section (123); And / or, the corresponding diameter of the first arc-shaped curved section (122) is smaller than the corresponding diameter of the second arc-shaped curved section (123).

6. The three-way connector according to claim 5, characterized in that: The angle between the axis of the insertion section (121) and the axis of the negative pressure channel (110) is 30° to 50°; And / or, the corresponding diameter of the first arc-shaped curved section (122) is 1 / 2 of the corresponding diameter of the second arc-shaped curved section (123).

7. The three-way connector according to any one of claims 1 to 6, characterized in that: A transition channel (140) is also provided in the base body (10), and the distal end of the negative pressure channel (110) is connected to the proximal end of the docking channel (130) through the transition channel (140), and the transition channel (140) is used to achieve a smooth transition between the negative pressure channel (110) and the docking channel (130).

8. The three-way connector according to any one of claims 1 to 6, characterized in that: The curvature of the second arc-shaped curved section (123) on the side close to the negative pressure channel (110) is greater than the curvature of the second arc-shaped curved section (123) on the side away from the negative pressure channel (110).

9. The three-way connector according to claim 8, characterized in that: The inner wall of the second arc-shaped curved section (123) close to the negative pressure channel (110) corresponds to a circle passing through the inner wall of the transition channel (140).

10. An endoscope, characterized in that: It comprises a handle (20), an insertion part (30) and a three-way connector according to any one of claims 1 to 9, wherein the three-way connector is arranged at the distal end of the handle (20), and the distal end of the docking channel (130) is connected to the proximal end of the insertion part (30).

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