Endoscope drainage tube, guide mechanism and choledochoscope

Abstract

An endoscope drainage tube, a guide mechanism and a choledochoscope, relate to the field of medical devices, the endoscope drainage tube comprises a hard drainage tube body, the hard drainage tube body has a first end and a second end in its extension direction, the hard drainage tube body is provided with an instrument channel for the sleeve of an external instrument to pass through, and the two ports of the instrument channel in its extension direction are located on the first end and the second end respectively; Part of the instrument channel is provided as a tapered cavity section, the inner diameter of the tapered cavity section gradually decreases in the direction from the first end to the second end. When the sleeve enters the instrument channel from the first end, the tapered cavity section can be in contact with the sleeve to limit the sleeve from approaching the second end. The structural design of the drainage tube can enhance the limiting effect and prolong the service life of the hose.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, specifically to an endoscope drainage tube, a guiding mechanism, and a cholangioscope. Background Technology

[0002] Endoscopes, such as cholangioscopes, can be inserted into the human body for observation, examination, and treatment. When the endoscope's drainage tube is too short, a longer flexible tube is needed to connect the drainage tube and the working channel of the insertion section. Endoscopes are also used in conjunction with external instruments, which can be inserted into the body under the guidance of the endoscope. A typical external instrument consists of an instrument body and a cannula through which the instrument body can pass. The instrument body extends out of the cannula by a fixed length. Simultaneously, the inner diameter of the flexible tube is larger than the outer diameter of the instrument body but smaller than the outer diameter of the cannula. The instrument body and cannula are inserted together through the drainage tube. The cannula stops entering due to the obstruction of the flexible tube. The instrument extends out of the cannula, continues to be inserted through the flexible tube, and enters the working channel of the insertion section, finally extending out from the endoscope tip to perform its function.

[0003] The inventors discovered in their research that existing endoscopic guidance mechanisms have at least the following drawbacks:

[0004] When the sleeve advances, it comes into contact with the hose and is blocked by the hose to achieve a limit. The external force applied to the sleeve acts directly on the hose, which may cause the hose to deform, resulting in poor limiting effect and short service life of the hose. Utility Model Content

[0005] The purpose of this invention includes, for example, providing an endoscope drainage tube, a guiding mechanism, and a cholangioscope that can enhance the limiting effect and extend the service life of the tubing.

[0006] The embodiments of this utility model can be implemented as follows:

[0007] In a first aspect, this utility model provides an endoscopic drainage tube, comprising:

[0008] The rigid drainage tube body has a first end and a second end in its extending direction. The rigid drainage tube body is provided with an instrument channel for the insertion of a cannula for external instruments. The two ports of the instrument channel in its extending direction are located on the first end and the second end, respectively. A portion of the instrument channel is configured as a gradient cavity section, and the inner diameter of the gradient cavity section gradually decreases in the direction from the first end to the second end.

[0009] When the cannula enters the instrument channel from the first end, the gradient cavity section can contact the cannula to restrict the cannula from approaching the second end.

[0010] In an optional embodiment, the rigid drainage tube body includes a first tube and a second tube connected together, the end of the first tube away from the second tube being the first end; the first tube has a first lumen, the second tube has a second lumen, the first lumen and the second lumen are connected to form the instrument channel; the second tube is configured as a curved tube, and a portion of the second lumen is configured as the gradient cavity segment.

[0011] In an optional embodiment, the first cavity includes a first cavity segment and a second cavity segment that are connected. The inner diameter of the first cavity segment is smaller than the inner diameter of the second cavity segment. A first limiting step is formed at the connection between the first cavity segment and the second cavity segment. The second tube body is inserted into the second cavity segment, and the second tube body can contact the first limiting step to limit the insertion depth of the second tube body.

[0012] In an optional embodiment, the second lumen further includes a positioning section communicating with the gradient cavity section, the port of the positioning section away from the gradient cavity section being located on the second end; the gradient cavity section includes an open end and a narrowed end, the inner diameter of the gradient cavity section gradually decreasing in the direction from the open end to the narrowed end; the inner diameter of the positioning section is larger than the inner diameter of the narrowed end, so as to form a second limiting step at the connection between the positioning section and the narrowed end.

[0013] In an optional embodiment, the first tube and the second tube are fixedly connected by ultrasonic welding.

[0014] In an optional embodiment, the rigid drainage tube body is configured as a plastic tube.

[0015] Secondly, this utility model provides a guiding mechanism, the guiding mechanism comprising:

[0016] The composite tube, the adapter hose, and the endoscopic drainage tube described in any of the foregoing embodiments are connected in sequence.

[0017] In an optional embodiment, the two ends of the adapter hose are respectively inserted into the composite tube and the rigid drainage tube body.

[0018] In an optional embodiment, the adapter hose and the rigid drainage tube body are bonded and fixed together.

[0019] Thirdly, this utility model provides a cholangioscope, the cholangioscope comprising:

[0020] The handle housing and the guiding mechanism described in any of the foregoing embodiments, wherein the rigid drainage tube body, the flexible tube, and the composite tube are all mounted on the handle housing.

[0021] The beneficial effects of this utility model embodiment include, for example:

[0022] In summary, the endoscopic drainage tube provided in this embodiment, by incorporating a tapered cavity within the rigid drainage tube body, allows external instruments to enter the instrument channel from the first end of the tube. As the external instrument's cannula advances, it reaches the tapered cavity and is blocked, thus limiting further advancement and positioning the cannula. Because the rigid drainage tube body has high strength and is not easily deformed, the cannula's position is stable, providing excellent positioning. Since the cannula does not directly contact the tubing, no external force is applied to the tubing, preventing deformation and damage, and extending the tubing's lifespan. Furthermore, the tapered cavity can accommodate cannulas of different diameters, broadening its applicability. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the endoscopic drainage tube in this embodiment;

[0025] Figure 2 This is an exploded view of the endoscopic drainage tube in this embodiment.

[0026] Figure 3 This is a schematic diagram of the guiding mechanism in this embodiment;

[0027] Figure 4 This is a schematic diagram of the cholangioscope used in this embodiment;

[0028] Figure 5 This is a partial schematic diagram of the cholangioscope in this embodiment.

[0029] icon:

[0030] 100-Rigid drainage tube body; 101-First end; 102-Second end; 110-First tube body; 111-First cavity segment; 112-Second cavity segment; 113-First limiting step; 120-Second tube body; 121-Equal diameter cavity segment; 122-Graduated cavity segment; 123-Positioning cavity segment; 124-Second limiting step; 200-Composite tube; 300-Adapter hose; 400-Handle housing. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0033] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0034] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0035] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0036] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0037] In existing technologies, when external instruments are inserted into an endoscope, the cannula is limited by the endoscope's flexible tubing, which connects the drainage tube and the insertion point, compensating for the distance between them. Because the tubing has a certain degree of deformation capability, it can be bent and arranged within the handle, thus better connecting the drainage tube and the insertion point. However, when the cannula contacts and is limited by the tubing, external force is directly applied to the tubing through the cannula, making the tubing prone to deformation. This results in poor cannula positional stability, ineffective limiting, and a short service life due to easy deformation and damage to the tubing.

[0038] In view of this, the designer provides an endoscope drainage tube that can contact the sheath to position the sheath. When the external force of the sheath acts on the rigid drainage tube body 100, the rigid drainage tube body 100 is not easily deformed, has a good limiting effect, is not easily deformed and damaged, and has a long service life.

[0039] Please refer to Figure 1 and Figure 2 This embodiment provides an endoscopic drainage tube, including a rigid drainage tube body 100. The rigid drainage tube body 100 has a first end 101 and a second end 102 in its extending direction. The rigid drainage tube body 100 is provided with an instrument channel for the insertion of a cannula for external instruments. The two ports of the instrument channel in its extending direction are located on the first end 101 and the second end 102, respectively. A portion of the instrument channel is configured as a tapered cavity section 122, the inner diameter of which gradually decreases from the first end 101 to the second end 102. When the cannula enters the instrument channel from the first end 101, the tapered cavity section 122 can contact the cannula to limit the cannula from approaching the second end 102.

[0040] As described above, the endoscopic drainage tube provided in this embodiment works as follows:

[0041] The endoscopic drainage tube, the adapter hose 300, and the composite tube 200 are connected in sequence. The composite tube 200 can also be referred to as the insertion section. The external instrument is inserted from the proximal end of the endoscopic drainage tube, that is, the end closer to the surgeon. The cannula of the external instrument and the instrument body inserted inside the cannula move together toward the composite tube 200. During this process, the cannula first contacts the inner wall of the tapered section 122 in the endoscopic drainage tube. After being restricted by the inner wall of the tapered section 122, the cannula cannot advance further. The instrument body continues to advance and enters the hose and the composite tube 200. Finally, it extends from the distal end of the endoscope, that is, the end closer to the patient, to perform the corresponding treatment.

[0042] It should be understood that by providing a tapered cavity 122 inside the rigid drainage tube body 100, when an external instrument enters the instrument channel from the first end 101 of the drainage tube, the instrument's cannula will reach the tapered cavity 122 during its advancement and be blocked, thus limiting the cannula's further advancement and positioning it. Because the rigid drainage tube body 100 has high strength and is not easily deformed, the cannula's position is stable, the limiting effect is good, and the cannula does not directly contact the tubing, thus avoiding external force on the tubing and preventing deformation or damage, extending the tubing's service life. Furthermore, the tapered cavity 122 can accommodate cannulas of different diameters, making it widely applicable.

[0043] The following embodiments illustrate the details of the endoscopic drainage tube of this application by way of example.

[0044] Please refer to Figure 1and Figure 2 In this embodiment, optionally, the endoscopic drainage tube includes a rigid drainage tube body 100, which includes a first tube body 110 and a second tube body 120. One end of the first tube body 110 is inserted into one end of the second tube body 120. The end of the first tube body 110 away from the second tube body 120 is the first end 101, and correspondingly, the end of the second tube body 120 away from the first tube body 110 is the second end 102. The first tube body 110 has a first lumen, and the second tube body 120 has a second lumen. After the first tube body 110 and the second tube body 120 are inserted into each other, the first lumen and the second lumen communicate to form an instrument channel for the insertion of external instruments.

[0045] Optionally, the first cavity of the first tube body 110 includes a first cavity segment 111 and a second cavity segment 112 that are connected. Both the first cavity segment 111 and the second cavity segment 112 can be circular segments and coaxially designed. Meanwhile, the inner diameter of the first cavity segment 111 is smaller than the inner diameter of the second cavity segment 112, so as to form a first limiting step 113 at the connection position of the first cavity segment 111 and the second cavity segment 112. The first limiting step 113 is an annular limiting structure.

[0046] Optionally, the second tube 120 is configured as a curved tube, and the second cavity of the second tube 120 includes a constant-diameter cavity section 121, a tapered cavity section 122, and a positioning cavity section 123 connected in sequence. The tapered cavity section 122 has an open end and a constricted end in its extending direction, and the inner diameter of the tapered cavity section 122 gradually decreases from the open end to the constricted end. The constant-diameter cavity section 121 is connected to the open end, and the inner diameter of the constant-diameter cavity section 121 is substantially the same as the inner diameter of the open end of the tapered cavity section 122. The positioning cavity section 123 is connected to the constricted end, and the inner diameter of the positioning cavity section 123 is substantially the same as the inner diameter of the open end of the tapered cavity section 122. Thus, the inner diameter of the positioning cavity section 123 is larger than the inner diameter of the constricted end, and a second limiting step 124 is formed at the connection between the positioning cavity section 123 and the constricted end. Furthermore, the equal-diameter cavity segment 121, the gradually changing cavity segment 122, and the positioning cavity segment 123 are designed coaxially, and the second limiting step 124 forms a ring-shaped limiting structure.

[0047] It is worth noting that the end of the second tube 120 is inserted into the second cavity 112, and the end of the second tube 120 can abut against the first limiting step 113, thereby limiting the depth of the second tube 120 inserted into the first tube 110, improving assembly quality and efficiency. When the first tube 110 and the second tube 120 are inserted and fitted, the inner diameters of the first cavity 111 of the first tube 110 and the equal-diameter cavity 121 of the second tube 120 are basically the same, so that the connection between the first tube 110 and the second tube 120 is smooth and no step structure is formed, resulting in good passage.

[0048] In addition, both the first tube 110 and the second tube 120 can be designed as plastic tubes. After the first tube 110 and the second tube 120 are inserted, they can be fixedly connected by ultrasonic welding. The fixing method is simple, reliable, highly stable, and not easy to loosen.

[0049] The endoscopic drainage tube provided in this embodiment, by setting the tapered section in the second tube body 120, can accurately limit the position of the cannula using the wall of the second tube body 120. The second tube body 120 has high structural strength and is not easily deformed by external forces applied to the cannula during limiting, resulting in a long service life. Simultaneously, the second tube body 120 is designed as a curved tube, which can compensate for part of the distance between the composite tube 200 and the drainage tube, thereby reducing the length of the flexible tube or even eliminating it entirely. The tapered section can be moved closer to the composite tube 200. After the tapered section moves forward, the insertion position of the cannula also moves forward, ensuring that the length of the instrument body extending beyond the cannula can extend from the endoscope end.

[0050] Please refer to Figure 3 This embodiment also provides a guiding mechanism, including a composite tube 200, an adapter hose 300, and an endoscopic drainage tube. The composite tube 200, the adapter hose 300, and the rigid drainage tube body 100 are connected sequentially. During assembly, one end of the adapter hose 300 is inserted into the composite tube 200, and the other end is inserted into the positioning cavity 123 of the second tube body 120. The hose can contact the second limiting step 124, limiting the insertion depth of the adapter hose 300 and ensuring that the adapter hose 300 does not enter the transition section, does not contact the sleeve, and is not easily deformed or damaged under the action of the sleeve. The adapter hose 300 has a long service life.

[0051] In addition, the adapter hose 300 can also be bonded and fixed to the second tube body 120 to improve the bonding strength.

[0052] It should be understood that in other embodiments, the composite tube 200 can be directly connected to the rigid drainage tube body 100, thereby eliminating the need for the adapter hose 300. For example, the composite tube 200 can be directly inserted into the second tube body 120.

[0053] Please refer to Figure 4 and Figure 5 This embodiment also provides a choledochoscope, which includes a handle housing 400 and a guiding mechanism. The rigid drainage tube body 100, the flexible tube and the composite tube 200 are all installed in the handle housing 400.

[0054] It should be understood that, since the rigid drainage tube body 100 is set as a split structure in which the first tube body 110 and the second tube body 120 are inserted, the second tube body 120 can be set as a curved tube, thereby adapting to the direction of the curved positioning structure inside the handle housing 400, thereby making up for part of the distance that needs to be connected to the adapter hose 300, shortening the length of the adapter hose 300, and making the design position of the gradient section closer to the composite tube 200, thereby moving the position of the sleeve forward, thus ensuring that the length of the instrument body extending out of the sleeve can extend from the endoscope end.

[0055] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. An endoscopic drainage tube, characterized by, include: A rigid drainage tube body (100) has a first end (101) and a second end (102) in its extending direction. The rigid drainage tube body (100) is provided with an instrument channel for the insertion of a cannula for external instruments. The two ports of the instrument channel in its extending direction are located on the first end (101) and the second end (102), respectively. A portion of the instrument channel is configured as a tapered cavity section (122), the inner diameter of which gradually decreases in the direction from the first end (101) to the second end (102). When the cannula enters the instrument channel from the first end (101), the gradient cavity section (122) can contact the cannula to restrict the cannula from approaching the second end (102).

2. The endoscopic drainage tube according to claim 1, characterized in that: The rigid drainage tube body (100) includes a first tube body (110) and a second tube body (120) connected together. The end of the first tube body (110) away from the second tube body (120) is the first end (101). The first tube body (110) has a first lumen, and the second tube body (120) has a second lumen. The first lumen and the second lumen are connected to form the instrument channel. The second tube (120) is configured as a curved tube, and a portion of the second tube cavity is configured as the gradient cavity segment (122).

3. The endoscopic drainage tube according to claim 2, characterized in that: The first cavity includes a first cavity segment (111) and a second cavity segment (112) that are connected. The inner diameter of the first cavity segment (111) is smaller than the inner diameter of the second cavity segment (112). A first limiting step (113) is formed at the connection between the first cavity segment (111) and the second cavity segment (112). The second tube body (120) is inserted into the second cavity segment (112), and the second tube body (120) can contact the first limiting step (113) to limit the insertion depth of the second tube body (120).

4. The endoscopic drainage tube according to claim 2, characterized in that: The second lumen further includes a positioning section (123) communicating with the gradient section (122), the port of the positioning section (123) away from the gradient section (122) being located on the second end (102); the gradient section (122) includes an open end and a narrowed end, the inner diameter of the gradient section (122) gradually decreasing in the direction from the open end to the narrowed end; the inner diameter of the positioning section (123) is larger than the inner diameter of the narrowed end, so as to form a second limiting step (124) at the connection between the positioning section (123) and the narrowed end.

5. The endoscopic drainage tube according to claim 2, characterized in that: The first tube (110) and the second tube (120) are fixedly connected by ultrasonic welding.

6. The endoscopic drainage tube according to any one of claims 1-5, characterized in that: The rigid drainage tube body (100) is made of plastic.

7. A guide mechanism, characterized by The guiding mechanism includes: The composite tube (200), the adapter hose (300), and the endoscopic drainage tube according to any one of claims 1-6 are connected in sequence.

8. The guiding mechanism according to claim 7, characterized in that: The two ends of the adapter hose (300) are respectively inserted into the composite tube (200) and the rigid drainage tube body (100).

9. The guiding mechanism according to claim 7, characterized in that: The adapter hose (300) and the rigid drainage tube body (100) are bonded and fixed together.

10. A choledochoscope, characterized in that, The cholangioscope includes: The handle housing (400) and the guiding mechanism according to any one of claims 7-9, wherein the rigid drainage tube body (100), the hose and the composite tube (200) are all mounted on the handle housing (400).

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