An introducer tip, endoscope assembly, and delivery device

Abstract

The application provides a guide head, an endoscope assembly and an implantation device, and belongs to the technical field of endoscopes. The guide head comprises a main pipe section, a clamping piece and a reset structure. The main pipe section has a mounting channel. At least the region of the main pipe section corresponding to the light source and the camera module at the distal end of the insertion part is transparent. The clamping piece is movably connected to the main pipe section. The clamping piece is configured to be driven by the distal end of the insertion part to move from a first position to a second position. When the clamping piece is in the first position, the clamping piece avoids the distal end of the sheath tube sleeved outside the insertion part in the axial direction of the main pipe section. When the clamping piece is in the second position, the clamping piece is limitedly matched with the distal end of the sheath tube. The reset structure is used to drive the clamping piece to move from the second position to the first position. At least part of the region of the guide head is set to be transparent to obtain the image information of the inner wall of the cavity, so that the operator can determine the advancing direction of the guide head and avoid damage to the cavity caused by the guide head.

Description

Technical Field

[0001] This invention belongs to the field of endoscope technology, specifically relating to an introductory tip, an endoscope assembly, and an insertion device. Background Technology

[0002] Endoscopes are widely used in modern medicine. They consist of a handle and an insertion part. In practice, the insertion part of the endoscope is inserted into the body through a cavity or surgical incision. The camera module at the distal end of the insertion part is used to acquire image information of the lesion site.

[0003] During the use of endoscopes, due to the flexible nature of the insertion section, they are generally used in conjunction with rigid endoscopes. Specifically, the rigid endoscope is first inserted into the bladder and ureter through the urethra; then a guidewire is passed through the working channel of the rigid endoscope to the renal pelvis; the rigid endoscope is withdrawn, leaving only the guidewire in the urinary tract; next, the ureteral sheath and its core are inserted through the guidewire; the core is withdrawn from the ureteral sheath; then the endoscope insertion section is inserted through the ureteral sheath, and the inserted instruments are delivered through the instrument channel within the insertion section to the body cavity to perform functions such as fiber optic lithotripsy, cooling irrigation, and stone retrieval. However, in actual use, it has been found that existing endoscopes are prone to causing damage to body cavities during insertion. Summary of the Invention

[0004] The purpose of this application is to provide an implantation tip, endoscope assembly, and insertion device to solve the aforementioned technical problems existing in the prior art.

[0005] This application is implemented as follows:

[0006] In a first aspect, embodiments of this application provide an insertion tip for use with an endoscope. The insertion tip includes a main tube section, a snap-fit ​​component, and a reset structure. The main tube section has an installation channel for fixing the distal end of the endoscope insertion portion. At least one area of ​​the main tube section corresponding to the light source and camera module at the distal end of the insertion portion is transparent. The snap-fit ​​component is movably connected to the main tube section. The snap-fit ​​component is configured to move from a first position to a second position under the drive of the distal end of the insertion portion. When the snap-fit ​​component is in the first position, along the axial direction of the main tube section, the snap-fit ​​component can avoid the distal end of the sheath sleeved outside the insertion portion, and a portion of the snap-fit ​​component is located on the insertion path of the distal end of the insertion portion. When the snap-fit ​​component is in the second position, along the axial direction of the main tube section, the snap-fit ​​component can engage with the distal end of the sheath for limiting. The reset structure is connected to the snap-fit ​​component and is used to drive the snap-fit ​​component to move from the second position to the first position.

[0007] Secondly, embodiments of this application provide an endoscope assembly, including an insertion part and an inlet end provided in the first aspect, wherein the distal end of the insertion part is inserted into an installation channel.

[0008] Thirdly, this application provides an insertion device, including a sheath and an endoscope assembly provided in the second aspect, with the insertion portion passing through the sheath.

[0009] The technical solution adopted in this invention can achieve the following beneficial effects:

[0010] In this application, the inlet end includes a main pipe section and a snap-fit ​​connector. The main pipe section is inserted and fixed to the distal end of the insertion part. The area corresponding to the light source and camera module at the distal end of the main pipe section and the insertion part is set to be transparent to illuminate the inside of the cavity. This facilitates the camera module to obtain clear image information inside the cavity, allowing the operator to determine the forward direction of the inlet end based on the image information, and avoiding the situation where the forward direction of the inlet end is incorrect, thereby damaging the inner wall of the cavity.

[0011] In addition, a locking device is provided that is movably connected to the main tube section. The locking device is driven from a first position to a second position by the insertion action of the distal end of the insertion part into the main tube section, allowing it to move to the distal end of the sheath and engage with it axially along the main tube section. Based on this, during the insertion of the insertion tip into the human body, the insertion tip can be pressed against the sheath under resistance, with the sheath supporting the tip and stabilizing its position, thus improving the smoothness and stability of the insertion action. Furthermore, by moving the insertion part proximally, while it is locked in place with the main tube section, the insertion part separates from the locking device. The locking device can then move from the second position to the first position under the action of the reset structure, facilitating the insertion part to drive the insertion tip out of the human body cavity through the sheath, providing operating space for subsequent surgical procedures.

[0012] Furthermore, the snap-fit ​​component can cover the distal end of the sheath, preventing the outer edge of the distal end face of the sheath from scratching the inner wall of the cavity. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the overall structure of the import terminal provided in some embodiments of this application;

[0015] Figure 2 This is an AA sectional view of the imported end provided in this application;

[0016] Figure 3 This is a BB cross-sectional view of the import end provided in this application;

[0017] Figure 4 This is a schematic diagram showing the disassembled card connector provided in some embodiments of this application;

[0018] Figure 5 This is a schematic diagram of the structure of the main control section provided in some embodiments of this application;

[0019] Figure 6 This is a schematic diagram showing the cooperation of the inlet end, insertion part and sheath provided in some embodiments of this application;

[0020] Figure 7 It is about Figure 6 Detailed image of point C;

[0021] Figure 8 This is a cross-sectional view showing the mating of the inlet end, insertion portion, and sheath provided in some embodiments of this application. Figure 1 ;

[0022] Figure 9 This is a cross-sectional view showing the mating of the inlet end, insertion portion, and sheath provided in some embodiments of this application. Figure 2 .

[0023] In the diagram: 10-Inlet end, 110-Main section, 111-Installation channel, 112-Through hole, 113-Second guide surface, 114-Installation groove, 115-Guide wire channel, 116-Interference fit protrusion, 120-Snap-fit ​​component, 121-First guide surface, 122-Pushing part, 122a-Pushing surface, 123-Limiting part, 123a-Contact section, 123b-Protruding section, 124-Transition structure, 130-Elastic component, 20-Installation part, 30-Sheath tube. Detailed Implementation

[0024] The following description provides many different embodiments or examples for implementing various features of the invention. The elements and arrangements described in the specific examples below are only for concise expression of the invention and are merely examples, not intended to limit the invention.

[0025] It should be noted that in the various embodiments of this application, "proximal end" and "distal end" refer to the position of the endoscope and its accessories relative to the user in the usage environment. 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".

[0026] In related techniques, during the insertion of the ureteral sheath and the sheath core located inside the sheath, the operator performs the insertion operation without a field of vision, and can only insert blindly. Under blind insertion conditions, the operator can only judge the insertion direction based on experience, which can easily cause damage to the inner wall of the body cavity due to incorrect insertion direction at narrow or bent parts of the body cavity, increasing the surgical risk.

[0027] In view of this, some embodiments of this application provide an insertion tip for use in an endoscope.

[0028] See Figures 1 to 9 As shown, the insertion tip 10 disclosed in this application embodiment includes a main tube section 110, a snap-fit ​​member 120, and a reset structure. The main tube section 110 has a mounting channel 111, which is used to be sleeved on the distal end of the insertion part 20 of the endoscope and fixedly connected to the insertion part 20. At least a portion of the main tube section 110 is transparent, and this portion corresponds to the area of ​​the main tube section 110 corresponding to the light source and camera module at the distal end of the insertion part 20. The transparent structure facilitates the passage of light emitted by the light source to illuminate the inner wall of the cavity; and the transparent structure facilitates the camera module to acquire cavity image information in front of the insertion tip 10, making it easier for the operator to determine the insertion direction of the insertion tip 10. It can be understood that the area corresponding to the light source and camera module refers to the area of ​​the main tube section 110 corresponding to the light divergence range of the light source and the area of ​​the main tube section 110 corresponding to the imaging range of the camera module along the axial direction of the main tube section 110 when the main tube section 110 is fixed to the distal end of the insertion part 20. The connector 120 is movably connected to the main section 110, and the connector 120 is movable on the main section 110 to change its relative position to the main section 110.

[0029] The snap-fit ​​connector 120 has a first position and a second position on the main pipe section 110. When the snap-fit ​​connector 120 is in the first position, a portion of the snap-fit ​​connector 120 is located on the insertion path at the distal end of the insertion part 20. During the insertion of the distal end of the insertion part 20 into the installation channel 111 of the main pipe section 110, the snap-fit ​​connector 120 can contact the insertion part 20, and the insertion part 20 drives the snap-fit ​​connector 120 to move from the first position to the second position, thus changing the position of the snap-fit ​​connector 120. Furthermore, when the snap-fit ​​connector 120 is in the first position, and the sheath 30 of the ureteral sheath is sleeved outside the insertion part 20, with the distal end of the insertion part 20 inserted into the installation channel 111 and not in contact with the snap-fit ​​connector 120, the snap-fit ​​connector 120 is positioned away from the distal end of the sheath 30 in the axial direction of the main pipe section 110. Avoidance means that, in the axial direction of the main pipe section 110, the snap-fit ​​member 120 and the distal end of the sheath 30 are not on the same straight line, the inlet end 10 can move freely along its axial direction, and the distal end of the sheath 30 will not obstruct the movement of the inlet end 10.

[0030] Due to the pushing action of the insertion part 20, the locking member 120 moves from the first position to the second position. With the locking member 120 in the second position and the sheath 30 sleeved outside the insertion part 20, the locking member 120 can engage with the distal end of the sheath 30 along the axial direction of the main pipe section 110. The distal end of the sheath 30 restricts the position of the locking member 120, preventing it from moving along the axial direction of the main pipe section 110, thereby fixing the relative position of the insertion end 10 and the sheath 30. The insertion part 20 and the sheath 30 together support the insertion end 10. It can be understood that the insertion part 20 can be bent under the drive of the traction structure, and its structure is softer than that of the sheath 30, resulting in weaker support for the insertion end 10. During the insertion of the insertion end 10, when the insertion end 10 encounters resistance, the sheath 30 mainly provides support, stabilizing the position of the insertion end 10 and improving the smoothness and stability of the insertion of the insertion part 20, the insertion end 10, and the sheath 30. Furthermore, it can reduce the force exerted by the inlet end 10 on the insertion part 20, thereby reducing the stress on the insertion part 20 and preventing the insertion part 20 from being damaged due to the force exerted by the inlet end 10.

[0031] When the locking member 120 is in the first position, it cannot engage with the distal end of the sheath 30 and can move freely inside the sheath 30. When the locking member 120 is in the second position, it engages with the distal end of the sheath 30. It can be concluded that during the movement of the locking member 120 from the first position to the second position, the locking member 120 has a radial displacement in the main pipe section 110, thereby increasing the radial dimension of the inlet end 10 and enabling the locking member 120 to engage with the distal end of the sheath 30. There can be one or more locking members 120; multiple locking members 120 can be arranged circumferentially around the main pipe section 110 to improve the limiting effect between the inlet end 10 and the distal end of the sheath 30.

[0032] The inlet end 10 provided in this embodiment can be directly adapted to the sheath 30 and insertion part 20 in the prior art. The inlet end 10 can be directly installed without modifying the structure of the sheath 30 and insertion part 20, making it more convenient to use. Furthermore, at least a portion of the main pipe section 110 is made transparent, which facilitates the camera module obtaining clear information about the inside of the cavity, providing the operator with a clear operating view and making it easier for the operator to determine the insertion direction of the inlet end 10. This ensures that the inlet end 10 can advance along the extension direction of the cavity, protecting the inner wall of the cavity from damage by the inlet end 10.

[0033] In practical use, the insertion part 20 is first inserted into the sheath tube 30 outside the human body, so that the distal end of the insertion part 20 is exposed outside the sheath tube 30. Then, the distal end of the insertion part 20 is inserted into the installation channel 111 of the main pipe section 110, for reference. Figure 6and Figure 7 As shown. The distal end of the insertion part 20 abuts against the snap-fit ​​member 120 in the installation channel 111, driving the snap-fit ​​member 120 from the first position to the second position. The radial dimension of the guide end 10 increases, pulling the insertion part 20 back. The increased-sized guide end 10 cannot enter the sheath 30. The snap-fit ​​member 120 and the distal end of the sheath 30 are engaged in an axial upper limit fit at the main pipe section 110. In this way, the insertion part 20, the guide end 10, and the sheath 30 can be inserted into the human body. The insertion direction of the guide end 10 is changed by the insertion part 20, and clear visual information is obtained by the light source and camera module at the distal end of the insertion part 20, which assists in the smooth insertion of the sheath 30 into the human body.

[0034] In some preferred embodiments, the inlet tip 10 is further provided with a guide wire channel 115. The guide wire channel 115 communicates with the mounting channel 111, and the mounting channel 111 extends through the proximal end of the inlet tip 10, while the guide wire channel 115 extends through the distal end of the inlet tip 10, so that the inlet tip 10 can be fitted over the guide wire. (Refer to...) Figure 2 and Figure 3 As shown. In actual use, the instrument channel of the insertion part 20, the mounting channel 111 of the guide tip 10, and the guidewire channel 115 are connected and sleeved on the guidewire. The distal dimension of the guide tip 10 is smaller than its proximal dimension to facilitate the insertion of the guide tip 10. Therefore, to accommodate the position of the instrument channel of the insertion part 20, the guidewire channel 115 is bent. (Refer to...) Figure 3 As shown.

[0035] The reset structure is connected to the snap-fit ​​component 120. The reset structure is mainly used to assist the snap-fit ​​component 120 in resetting, so that the snap-fit ​​component 120 can move from the second position to the first position.

[0036] After the sheath 30 and insertion part 20 reach the target cavity, the guide tip 10 needs to be removed to prepare for subsequent surgical procedures. Specifically, during the removal of the guide tip 10, the insertion part 20 needs to be partially retracted, i.e., pulled proximally. Due to the limiting effect of the sheath 30 and the locking member 120, the guide tip 10 cannot move with the position of the insertion part 20, allowing the insertion part 20 to separate smoothly from the locking member 120. After the locking member 120 separates from the insertion part 20, it loses the support of the insertion part 20 and can no longer maintain positional stability. The locking member 120 can no longer engage with the distal limiting effect of the sheath 30, and under the drive of the repositioning structure, the locking member 120 can move from the second position to the first position. The radial dimension of the guide tip 10 decreases to ensure that the guide tip 10 can enter the sheath 30 and exit from the sheath 30 together with the insertion part 20. After removing the guide tip 10, the subsequent surgical procedures can proceed normally.

[0037] During the process of removing the inlet end 10 from the sheath tube 30, the inlet end 10 can be removed from the sheath tube 30 simply by pulling out the insertion part 20. The operation is simple and convenient, and there are no additional operations compared with the existing technology, making it more convenient to use.

[0038] After the snap-fit ​​120 separates from the insertion part 20, it is necessary to ensure that the snap-fit ​​120 can smoothly move from the second position to the first position under the drive of the reset structure. In some embodiments of this application, the reset structure can be set as a guide surface located on the proximal surface of the snap-fit ​​120. After the insertion part 20 separates from the snap-fit ​​120, during the process of continuing to pull the insertion part 20, due to the loss of the support of the insertion part 20, as the guide surface at the proximal end of the snap-fit ​​120 abuts against the distal end of the sheath 30, the snap-fit ​​120 will move from the second position to the first position under the guidance of the guide surface, reducing the size of the inlet end 10, so that the inlet end 10 can enter into the sheath 30 and exit from the sheath 30 together with the insertion part 20. In other embodiments of this application, the reset structure can be set as a skin, which covers the outer surface of the inlet end 10. When the snap-fit ​​120 is in the second position, the skin is tightened by the snap-fit ​​120. After the snap-fit ​​120 loses the support of the insertion portion 20, the snap-fit ​​120 will move from the second position to the first position under the springback action of the skin. And / or, a reset structure is provided as an elastic element 130, which is connected between the snap-fit ​​120 and the main pipe section 110. When the snap-fit ​​120 is in the second position, the elastic element 130 is in a stretched state. After the snap-fit ​​120 loses the support of the insertion portion 20, the snap-fit ​​120 will move from the second position to the first position under the springback action of the elastic element 130.

[0039] The insertion part 20 and the main pipe section 110 can be fixed by directly inserting the distal end of the insertion part 20 into the main pipe section 110, so that the insertion part 20 and the main pipe section 110 are fixed in position by interference fit. However, with this layout, the contact area between the two is too large, making installation and disassembly more difficult, and it is also prone to excessive wear of the insertion part 20. Therefore, an interference protrusion 116 can be provided on the inner wall of the installation channel 111, as shown in the reference. Figure 2 and Figure 3As shown, the insertion part 20 is interference-fitted with the interference-fit protrusion 116, reducing the contact area and facilitating assembly and disassembly. Furthermore, multiple interference-fit protrusions 116 can be provided, arranged axially along the main pipe section 110. This improves the connection stability between the insertion part 20 and the main pipe section 110. On the other hand, even if the insertion part 20 moves a large distance relative to the guide end 10 during the process of pulling the insertion part 20 proximally, and after separating from the locking member 120, the insertion part 20 may separate from some of the interference-fit protrusions 116, but the probability of the insertion part 20 separating from all of the interference-fit protrusions 116 simultaneously is low. The insertion part 20 still maintains an interference fit with some of the interference-fit protrusions 116, preventing the insertion part 20 from directly dislodging from the guide end 10 after separating directly from the locking member 120, thus avoiding the situation where the insertion part 20 cannot be pulled out of the sheath 30 together with the guide end 10.

[0040] There are various movable connection structures between the snap-fit ​​connector 120 and the main pipe section 110. For example, the connection between the two can be either a rotatable connection or a movable connection. In the case of a movable connection, the pipe wall of the main pipe section 110 is provided with a through hole 112 for the snap-fit ​​connector 120 to pass through, so that when the snap-fit ​​connector 120 is in the first position, part of the snap-fit ​​connector 120 is located outside the main pipe section 110, and part of the snap-fit ​​connector 120 can pass through the through hole 112 and enter the installation channel 111, located on the insertion path at the distal end of the insertion part 20.

[0041] In some embodiments of this application, the snap-fit ​​member 120 can only move axially within the through hole 112. The snap-fit ​​member 120 is provided with a guide surface, which is inclined. The guide surface is inclined from the inner wall of the mounting channel 111 towards the center of the mounting channel 111 along the direction from the proximal end to the distal end of the main pipe section 110. After the distal end of the insertion part 20 contacts the snap-fit ​​member 120, as the insertion depth of the distal end of the insertion part 20 increases, the guide surface pushes the snap-fit ​​member 120 to move axially outward from the mounting channel 111 along the through hole 112, expanding the radial dimension of the inlet end 10. With this arrangement, the structure of the snap-fit ​​member 120 is relatively simple. However, the snap-fit ​​member 120 is always supported by the insertion part 20, which experiences significant force. Furthermore, since only a portion of the guide surface of the snap-fit ​​member 120 contacts the insertion part 20, the contact area is limited, making the distal end of the insertion part 20 prone to stress concentration and damage.

[0042] In other embodiments of this application, the snap-fit ​​member 120 can move not only axially within the through hole 112 but also axially within the main pipe section 110. Specifically, the through hole 112 is made relatively large so that the snap-fit ​​member 120 has a movement space within the through hole 112 to move axially within the main pipe section 110. At least one of the snap-fit ​​member 120 and the main pipe section 110 is provided with a guide surface for sliding engagement with the other. As the snap-fit ​​member 120 slides in the through hole 112, the one of the main pipe section 110 and the snap-fit ​​member 120 with the guide surface will slide relative to the other. The guide surface is set as an inclined surface, and the guide surface is inclined from the inside of the mounting channel 111 toward the outside of the mounting channel 111 in the direction from the proximal end to the distal end of the main pipe section 110. In this way, the radial position of the snap-fit ​​member 120 in the main pipe section 110 can change during the relative sliding of the snap-fit ​​member 120 and the main pipe section 110.

[0043] With this arrangement, during the insertion of the distal end of the insertion part 20 into the mounting channel 111 of the main pipe section 110, the distal end of the insertion part 20 only needs to push the portion of the snap-fit ​​member 120 located within the mounting channel 111 to move axially along the main pipe section 110. With the cooperation of the guide surface, the snap-fit ​​member 120 can slide on the main pipe section 110 and move away from the mounting channel 111, thereby increasing the radial dimension of the inlet end 10. Furthermore, the snap-fit ​​member 120 is mainly supported by the main pipe section 110, and the force exerted by the snap-fit ​​member 120 on the distal end of the insertion part 20 is relatively weak, avoiding stress damage to the distal end of the insertion part 20.

[0044] In some preferred embodiments, the snap-fit ​​member 120 and the main pipe section 110 are provided with mutually cooperating guide surfaces, as detailed in the following references. Figure 4 , Figure 5 and Figure 8 As shown, the snap-fit ​​member 120 has a first guide surface 121, and the main pipe section 110 has a second guide surface 113. The first guide surface 121 and the second guide surface 113 are parallel to each other and are in surface contact. In this arrangement, when the distal end of the insertion portion 20 pushes the portion of the snap-fit ​​member 120 located within the mounting channel 111 to move axially along the main pipe section 110, the first guide surface 121 and the second guide surface 113 are in surface contact, causing the first guide surface 121 to slide along the second guide surface 113 in a direction away from the mounting channel 111. This drives the snap-fit ​​member 120 to move axially along the through hole 112, thereby increasing the radial dimension of the insertion end 10. (Refer to...) Figure 9 As shown.

[0045] In some preferred embodiments, the snap-fit ​​member 120 includes a pushing portion 122 and a limiting portion 123. The limiting portion 123 is located outside the mounting channel 111 and is used for snap-fitting with the distal end of the sheath 30. The pushing portion 122 passes through the through hole 112, and when the snap-fit ​​member 120 is in the first position, the pushing portion 122 is located on the insertion path of the distal end of the insertion portion 20. The pushing portion 122 and the limiting portion 123 are in direct contact and are not connected. A first guide surface 121 is located on the pushing portion 122. As the distal end of the insertion portion 20 pushes the pushing portion 122 to move, as the pushing portion 122 moves outward from the mounting channel 111, the pushing portion 122 pushes the limiting portion 123 to move, thereby expanding the radial dimension of the snap-fit ​​member 120, so that the limiting portion 123 snaps with the distal end of the sheath 30.

[0046] When an elastic member 130 is connected between the snap-fit ​​member 120 and the main pipe section 110, the elastic member 130 is connected to the limiting part 123. On the one hand, the elastic member 130 can limit the position of the limiting part 123, preventing the limiting part 123 from moving arbitrarily. On the other hand, after the distal end of the insertion part 20 separates from the pushing part 122, while the elastic member 130 drives the limiting part 123 to reset, the limiting part 123 can push the pushing part 122 to reset, so that the snap-fit ​​member 120 as a whole can move from the second position to the first position.

[0047] By directly contacting and engaging the limiting part 123 and the pushing part 122 without providing a connecting device between them, it is possible that during the process of the pushing part 122 pushing the limiting part 123, the limiting part 123 can only have radial displacement of the main pipe section 110, and there will be no axial displacement of the main pipe section 110. This makes it easier for the limiting part 123 to subsequently reset from the second position to the first position, and avoids the limiting part 123 being limited by the distal end of the sheath 30 during the process of moving to the first position.

[0048] In some other preferred embodiments, the outer wall of the main pipe section 110 is provided with a mounting groove 114, see reference. Figure 5As shown. The limiting part 123 is located in the mounting groove 114, and the mounting groove 114 limits the limiting part 123. In the axial direction of the main pipe section 110, the mounting groove 114 and the limiting part 123 are in a limiting engagement. This allows the limiting part 123 to be clamped between the distal end of the sheath tube 30 and the groove wall of the mounting groove 114 during use, and the limiting part 123 can smoothly limit the distal end of the sheath tube 30. In addition, the mounting groove 114 can also be in a stop engagement with the limiting part 123 in the circumferential direction of the main pipe section 110. In some other embodiments, a stop structure can also be directly provided on the outer wall of the main pipe section 110 to limit the limiting part 123, so as to clamp the limiting part 123 between the distal end of the sheath tube 30 and the stop structure. The elastic element 130 can be connected between the bottom of the mounting groove 114 and the surface of the limiting part 123 near the bottom of the mounting groove 114, or it can be connected between the side wall of the limiting part 123 and the side wall of the mounting groove 114. The elastic element 130 is generally selected as an elastic rope structure to fit the size of the insertion part 20. The elastic element 130 can also be selected as a spring, with a custom-made spring of suitable size.

[0049] In some embodiments of this application, the snap-fit ​​member 120 is divided into a limiting part 123 and a pushing part 122. Compared to a single-piece structure with a guide surface that mates with the insertion part 20, the limiting part 123 has a shorter lever arm when it engages with the distal end of the sheath 30, making it less prone to breakage. If the snap-fit ​​member 120 were a single-piece structure, its lever arm would be longer when it engages with the distal end of the sheath 30, making it more susceptible to breakage.

[0050] The pushing part 122 has a pushing surface 122a that contacts and engages with the distal end face of the insertion part 20. This contact between the pushing part 122 and the distal end face of the insertion part 20 increases the contact area and further prevents stress concentration at the distal end of the insertion part 20. Furthermore, the pushing surface 122a is an arc surface, which guides the distal end of the insertion part 20 to move to the center of the mounting channel 111 during contact with the pushing surface 122a, ensuring that the distal end of the insertion part 20 is coaxially aligned with the mounting channel 111. In specific implementations, the arc surface engages with the arc surface of the distal edge of the insertion part 20. The arc surface of the pushing surface 122a has a guiding effect; after contact with the insertion part 20, the pushing surface 122a guides the insertion part 20 to a preset position along the curvature of the arc surface, preventing the insertion part 20 from shifting position or becoming misaligned with the mounting channel 111. Furthermore, by setting the pushing surface 122a as an arc surface, the contact between the pushing part 122 and the distal end of the insertion part 20 can be made more stable.

[0051] When there are multiple snap-fit ​​members 120, the multiple snap-fit ​​members 120 are arranged around the axis of the main pipe section 110, so that multiple push portions 122 can surround and form an annular cavity. The annular cavity corresponds to the distal end of the insertion portion 20, thereby facilitating the guidance of the distal end of the insertion portion 20 to a preset position. Furthermore, an elastic member 130 can be connected between two adjacent snap-fit ​​members 120. When the snap-fit ​​member 120 is in the second position, the elastic member 130 is in a stretched state. The elastic member 130 between two adjacent snap-fit ​​members 120 can assist the snap-fit ​​member 120 in returning from the second position to the first position.

[0052] In some preferred embodiments, the snap-fit ​​member 120 includes a limiting portion 123 located outside the mounting channel 111. The limiting portion 123 includes a contact portion 123a and a protruding portion 123b distributed axially along the main pipe section 110. The protruding portion 123b protrudes relative to the contact portion 123a in a direction away from the main pipe section 110, and the contact portion 123a is closer to the entrance of the mounting channel 111 than the protruding portion 123b. (See reference...) Figure 4 As shown. The entrance of the mounting channel 111 refers to the opening in the mounting channel 111 through which the distal end of the insertion part 20 is inserted during the insertion process between the mounting channel 111 and the distal end of the insertion part 20.

[0053] With the snap-fit ​​120 in the second position, the contact section 123a can be inserted into the sheath 30 sleeved outside the insertion part 20, and the protruding section 123b can engage with the distal end of the sheath 30 sleeved outside the insertion part 20 in the axial direction of the main pipe section 110. This arrangement makes the connection between the limiting part 123 and the distal end of the sheath 30 more stable, and the limiting effect of the limiting part 123 on the distal end of the sheath 30 is better. Furthermore, the maximum travel distance of the snap-fit ​​120 is specified, ensuring that the distance from which the distal end of the insertion part 20 is inserted into the installation channel 111 is fixed.

[0054] In addition to the limiting part 123 located outside the mounting channel 111, the snap-fit ​​connector 120 also includes a transition structure 124 located outside the mounting channel 111. (See reference) Figure 4As shown, the transition structure 124 is located on the side of the limiting portion 123 away from the entrance of the mounting channel 111. Specifically, when the snap-fit ​​member 120 is in the second position, one end of the surface of the transition structure 124 away from the mounting channel 111 is connected to the outer wall of the main pipe section 110 in the axial direction. Since the proximal end of the transition structure 124 is connected to the limiting portion 123, the distal end of the surface of the transition structure 124 away from the mounting channel 111 is connected to the outer wall of the main pipe section 110. This allows the transition structure 124 to smoothly transition with the outer wall of the main pipe section 110 in the circumferential direction, reducing discomfort to the user during insertion of the inlet end 10. When the snap-fit ​​member 120 is in the first position, the surface of the limiting portion 123 away from the mounting channel 111 is flush with the outer wall of the main pipe section 110 in the axial direction. With this layout, when the snap-fit ​​part 120 moves along the same path, the limiting part 123 protrudes higher relative to the main pipe section 110, resulting in a better limiting engagement with the distal end of the sheath 30. Furthermore, it makes it easier to control the radial dimension of the inlet end 10.

[0055] Some embodiments of this application also provide an endoscope assembly, including an insertion part 20 and an inlet end 10 provided in any of the above embodiments, wherein the distal end of the insertion part 20 is inserted into the installation channel 111.

[0056] Some embodiments of this application also provide an insertion device, including a sheath 30 and an endoscope assembly provided in any of the above embodiments, with an insertion portion 20 passing through the sheath 30. (See reference...) Figure 6 As shown.

[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 within the protection scope of the present invention.

Claims

1. An introductory tip for use in an endoscope, characterized in that, The inlet end (10) includes a main section (110), a snap-fit ​​component (120), and a reset structure, wherein: the main section (110) has an installation channel (111) for fixing the distal end of the insert endoscope (20), and at least the area of ​​the main section (110) corresponding to the light source and camera module at the distal end of the insert (20) is transparent, and the snap-fit ​​component (120) is movably connected to the main section (110); The snap-fit ​​member (120) is configured to move from a first position to a second position under the drive of the distal end of the insertion part (20); when the snap-fit ​​member (120) is in the first position, along the axial direction of the main tube section (110), the snap-fit ​​member (120) can avoid the distal end of the sheath tube (30) sleeved outside the insertion part (20), and part of the snap-fit ​​member (120) is located on the insertion path of the distal end of the insertion part (20); when the snap-fit ​​member (120) is in the second position, along the axial direction of the main tube section (110), the snap-fit ​​member (120) can engage with the distal end of the sheath tube (30) in a limiting fit. The reset structure is connected to the latch (120) and is used to drive the latch (120) to move from the second position to the first position.

2. The inlet head according to claim 1, characterized in that, The reset structure is a skin, which covers the outer surface of the inlet end (10), and the snap-fit ​​member (120) is configured to move from the second position to the first position under the springback action of the skin; And / or, the reset structure is an elastic element (130) connected between the snap-fit ​​member (120) and the main section (110), the snap-fit ​​member (120) being configured to move from a second position to a first position under the rebound action of the elastic element (130).

3. The inlet head according to claim 1, characterized in that, The main pipe section (110) has a through hole (112) through which the snap-fit ​​member (120) passes, and the snap-fit ​​member (120) is slidably disposed in the through hole (112) along the axial direction of the main pipe section (110). At least one of the snap-fit ​​member (120) and the main section (110) is provided with a guide surface, which is used to slide with the other. The snap-fit ​​member (120) is configured to slide within the through hole (112) under the push of the distal end of the insertion portion (20) and slide on the main pipe section (110) away from the mounting channel (111) via the guide surface.

4. An inlet head according to claim 3, characterized in that, The snap-fit ​​member (120) includes a pushing part (122) and a limiting part (123). The limiting part (123) is located outside the mounting channel (111), and the pushing part (122) passes through the through hole (112). When the snap-fit ​​member (120) is in the first position, the pushing part (122) is located on the insertion path at the distal end of the insertion part (20); wherein: The pushing part (122) contacts and engages with the limiting part (123); and / or, the outer side wall of the main pipe section (110) is provided with a mounting groove (114), the limiting part (123) is located in the mounting groove (114), and in the axial direction of the main pipe section (110), the mounting groove (114) engages with the limiting part (123).

5. An inlet tip according to claim 3, characterized in that, The snap-fit ​​member (120) includes a push-off part (122), which is located on the insertion path at the distal end of the insertion part (20) when the snap-fit ​​member (120) is in the first position. The pushing part (122) has a pushing surface (122a), which is an arc surface. The pushing surface (122a) is used to guide the distal end of the insertion part (20) to move to a position coaxial with the installation channel (111).

6. An inlet head according to claim 1, characterized in that, The snap-fit ​​member (120) includes a limiting portion (123) located outside the mounting channel (111). The limiting portion (123) includes a contact section (123a) and a protruding section (123b) distributed axially along the main pipe section (110). The protruding section (123b) protrudes relative to the contact section (123a) in a direction away from the main pipe section (110). The contact section (123a) is close to the entrance of the mounting channel (111). When the snap-fit ​​member (120) is in the second position, the contact section (123a) is configured to be inserted into the sheath (30) sleeved outside the insertion part (20), and the protruding section (123b) is capable of engaging with the distal end of the sheath (30) sleeved outside the insertion part (20) in the axial direction of the main section (110).

7. An inlet tip according to claim 1, characterized in that, The snap-fit ​​component (120) includes a limiting portion (123) located outside the main section (110) and a transition structure (124), the transition structure (124) being located on the side of the limiting portion (123) away from the entrance of the mounting channel (111), wherein: When the snap-fit ​​(120) is in the second position, the end of the surface of the transition structure (124) away from the mounting channel (111) in the axial direction of the main pipe section (110) is in contact with the outer wall of the main pipe section (110); and / or, when the snap-fit ​​(120) is in the first position, the surface of the limiting portion (123) away from the mounting channel (111) is flush with the outer wall of the main pipe section (110) in the axial direction of the main pipe section (110).

8. An inlet tip according to claim 1, characterized in that, There are multiple snap-fit ​​members (120), which are distributed around the axis of the mounting channel (111), and an elastic member (130) is connected between two adjacent snap-fit ​​members (120). When the snap-fit ​​member (120) is in the second position, the elastic member (130) is in a stretched state.

9. An endoscope assembly, characterized in that, Includes an insertion part (20) and an inlet end as described in any one of claims 1 to 8, wherein the distal end of the insertion part (20) is inserted into the mounting channel (111).

10. An insertion device, characterized in that, Includes a sheath (30) and the endoscope assembly of claim 9, wherein the insertion portion (20) passes through the sheath (30).

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