Drainage support and superfine endoscopic surgery system
By designing a drainage stent with an elastic guiding channel and flexible propulsion rod, the problem of the visual guide wire being unable to pass through the drainage stent was solved, achieving efficient and precise placement of the drainage stent, reducing surgical difficulty and tissue damage.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-02
- Publication Date
- 2026-04-03
AI Technical Summary
During ERCP surgery, the placement of the drainage stent can be complicated because the proximal connector of the guidewire cannot pass through the drainage channel of the stent.
A drainage support was designed, comprising a support tube and a push rod. The support tube has a drainage channel and a guide channel. The opening of the guide channel is an elastic structure that allows a visible guide wire to pass through. The push rod is a flexible or elastic structure that can push the support tube to move along the visible guide wire.
This allows for the accurate placement of the drainage stent under the guidance of a visual guidewire, improving surgical efficiency, reducing damage to surrounding tissues, and enhancing the precision and stability of the procedure.
Smart Images
Figure CN224070885U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of endoscopic technology, and in particular to a drainage stent and an ultra-thin endoscopic surgical system. Background Technology
[0002] In the subsequent procedures of ERCP, in addition to the common removal / crushing of stones, some patients may also develop inflammatory or tumor-related stenosis, requiring the use of a drainage stent to support the cavity. This stent also serves to prevent edema and poor drainage after nipple incision.
[0003] With the advent of visual guidewires, the difficulty of ERCP surgery can be reduced by directly observing the cavity. However, during the placement of the drainage stent, there is a problem that the proximal connector of the visual guidewire cannot pass through the drainage channel of the drainage stent because of the proximal connector. Utility Model Content
[0004] In view of this, the purpose of this application is to overcome the shortcomings of the prior art and provide a drainage stent and an ultra-thin endoscopic surgical system that enables the drainage stent to be inserted into the visual guide wire without being restricted by the proximal connector, and enables the drainage stent to be guided by the visual guide wire for cannulation, resulting in high surgical efficiency.
[0005] This application provides the following technical solution:
[0006] In a first aspect, embodiments of this application provide a drainage stent, the drainage stent comprising:
[0007] A support tube has a first distal end, a first proximal end, a drainage channel, and a guide channel. The drainage channel extends from the first distal end to the first proximal end, and both the drainage channel and the guide channel penetrate the support tube. At least one end of the guide channel near the first distal end extends along the extension direction of the drainage channel. The guide channel has an opening in its wall, which is configured to allow the wall of the guide channel to form a non-closed structure. The width of the opening is smaller than the outer diameter of the visible guide wire. The sidewall of the opening is configured as an elastic structure, and the elastic deformation of the sidewall of the opening allows the visible guide wire to pass through.
[0008] A push rod having a second distal end and a second proximal end, and the push rod being configured as a flexible or elastic structure, wherein the second distal end and the first proximal end of the support tube are pluggable and detachable connected, and the push rod is used to push the support tube to move along the visible guide wire.
[0009] In some embodiments of the first aspect, the support tube includes:
[0010] A support tube, wherein the drainage channel is disposed in the support tube and the drainage channel extends along the axial direction of the support tube;
[0011] A distal unidirectional limiting part, one end of which is connected to the outer wall of the support tube at the first distal end, and the other end of which gradually moves away from the support tube in a direction away from the first distal end.
[0012] A proximal unidirectional limiting part is provided, one end of which is connected to the outer wall of the support tube located at the first proximal end, and the other end of which gradually moves away from the support tube in a direction away from the first proximal end. A gap is provided between the proximal unidirectional limiting part and the support tube in the axial direction.
[0013] In some embodiments of the first aspect, both the distal unidirectional limiting portion and the proximal unidirectional limiting portion are configured as elastic structures.
[0014] In some embodiments of the first aspect, the distal unidirectional limiting portion and the proximal unidirectional limiting portion are respectively integrated with the support tube, and the support tube is configured as an elastic structure.
[0015] In some embodiments of the first aspect, the push rod includes:
[0016] An elastic rod, one end of which is located at the first distal end, can pass through the drainage channel;
[0017] A limiting part is provided, which is connected to the elastic rod, and the limiting part is capable of abutting against the end face of the first proximal end for limiting.
[0018] In some embodiments of the first aspect, the elastic rod has a large-diameter end and a small-diameter end, the small-diameter end being disposed at the second distal end and the large-diameter end being disposed at the second proximal end, the small-diameter end being able to pass through the drainage channel, a shoulder being formed between the large-diameter end and the small-diameter end, the shoulder being able to abut against the end face of the first proximal end, and the portion of the shoulder that contacts the first proximal end forming the limiting portion.
[0019] In some embodiments of the first aspect, the guide channel includes a first guide segment and a second guide segment connected in sequence, the first guide segment being close to the first distal end and the second guide segment being away from the first distal end, the drainage channel at least partially overlapping the first guide segment, the opening being disposed at the portion of the support tube located at the first distal end, the opening penetrating the outer wall of the support tube and extending to the end face of the first distal end.
[0020] In some embodiments of the first aspect, the drainage channel has a side hole in its wall, the side hole penetrating the outer wall of the support tube, the side hole coinciding with the second guide section, and the opening communicating with the side hole.
[0021] In some embodiments of the first aspect, the opening includes at least two sub-segments in the direction of extension of the opening, wherein the width of any two adjacent sub-segments decreases in a direction away from the first distal end.
[0022] In some embodiments of the first aspect, the guide channel is disposed at the distal one-way limiting portion, the guide channel extends along the axial direction of the support tube, and the opening is disposed on the side of the distal one-way limiting portion away from the support tube.
[0023] Alternatively, the guide channel is disposed at the proximal one-way limiting part, the guide channel extends along the axial direction of the support tube, and the opening is disposed on the side of the proximal one-way limiting part away from the support tube;
[0024] Alternatively, the distal unidirectional limiting part and the proximal unidirectional limiting part are located on the same side of the support tube, and the guide channel extends along the axial direction of the support tube. The guide channel includes a first guide section and a second guide section, the first guide section passing through the distal unidirectional limiting part and the second guide section passing through the proximal unidirectional limiting part.
[0025] Secondly, this application also provides an ultra-thin endoscopic surgical system, the ultra-thin endoscopic surgical system including a visual guide wire and a drainage stent as described in any of the above embodiments, the visual guide wire being an ultra-thin endoscope, the visual guide wire being at least partially inserted through the distal portion of the guide channel.
[0026] The embodiments of this application have the following advantages:
[0027] This application provides a drainage stent that allows the visual guidewire to enter and exit the guide channel from the opening by pushing a visual guidewire or support tube. This design enables the drainage stent to be inserted into the visual guidewire without being restricted by the proximal connector, and allows the drainage stent to be guided by the visual guidewire for cannulation. This results in high surgical efficiency and allows doctors to use the visual guidewire during surgery or other treatments to more accurately position and manipulate the drainage stent.
[0028] In use, the doctor first inserts the push rod containing the visual guidewire through the opening of the support tube into the guide channel, and adjusts the push rod to the predetermined position so that the limiting part abuts against the end face of the first proximal end. This ensures the stability and effectiveness of the thrust transmitted through the push rod to the support tube. Then, using the visual guidewire as a guide, the doctor pushes the drainage stent along the guidewire to accurately place the support tube in the body part requiring drainage. Once the support tube reaches the correct position, the push rod can be pulled back to detach it from the support tube, leaving it in the target cavity. Furthermore, because the push rod has deformation capability, it can deform along the extension direction of the visual guidewire to change the direction of the thrust transmitted through the push rod to the support tube in real time, thereby controlling the movement of the support tube along the visual guidewire.
[0029] This application also relates to an ultra-thin endoscopic surgical system. Since the above-mentioned drainage stent has the above-mentioned technical effects, the ultra-thin endoscopic surgical system including the drainage stent should have the same technical effects, which will not be repeated here.
[0030] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description
[0031] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0032] Figure 1 This illustration shows a schematic diagram of the structure of a drainage stent provided in Embodiment 1 of this application from one perspective;
[0033] Figure 2 This illustration shows a structural schematic diagram of a drainage stent provided in Embodiment 1 of this application from another perspective;
[0034] Figure 3 A partial structural schematic diagram of a support tube for a drainage stent provided in Embodiment 2 of this application is shown;
[0035] Figure 4 A schematic diagram of the drainage stent provided in Embodiment 3 of this application is shown from one perspective.
[0036] Figure 5 This illustration shows a schematic diagram of the distal unidirectional limiting portion of a drainage stent according to Embodiment 3 of this application from one perspective.
[0037] Figure 6 This illustration shows a schematic diagram of the distal unidirectional limiting portion of a drainage stent according to Embodiment 4 of this application from one perspective.
[0038] Figure 7 A schematic diagram of the structure of a drainage stent provided in Embodiment 5 of this application is shown from one perspective.
[0039] Explanation of key component symbols:
[0040] 100-Support tube; 110-Drainage channel; 120-Side hole; 130-Opening; 131-First sub-strument segment; 132-Second sub-strument segment; 140-Distal unidirectional limiting part; 150-Proximal unidirectional limiting part; 160-First distal end; 170-First proximal end; 180-Guide channel; 181-First guide segment; 182-Second guide segment; 200-Elastic rod; 210-Small diameter end; 220-Large diameter end. Detailed Implementation
[0041] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.
[0042] It should be noted that when an element is said to be "fixed" to another element, it can be directly on the other element or there may be an intervening element. When an element is said to be "connected" to another element, it can be directly connected to the other element or there may be an intervening element. Conversely, when an element is said to be "directly" on another element, there is no intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.
[0043] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the template description is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0046] In related technologies, in the subsequent procedures of ERCP, in addition to the common removal / fracture of stones, some patients may also experience inflammatory or tumor-related stenosis, requiring the use of drainage stents to support the cavity. These stents also serve to prevent edema and poor drainage after nipple incision.
[0047] With the advent of visual guidewires, the difficulty of ERCP surgery can be reduced by directly observing the cavity. However, during the placement of the drainage stent, there is a problem that the proximal connector of the visual guidewire cannot pass through the drainage channel of the drainage stent because of the proximal connector.
[0048] like Figure 1 and Figure 2 As shown, to solve the above-mentioned technical problems, this application provides a drainage support, which includes a supporting tube and a pushing rod. The supporting tube has a first distal end 160, a first proximal end 170, a drainage channel 110, and a guiding channel 180. The drainage channel 110 extends from the first distal end 160 to the first proximal end 170, and both the drainage channel 110 and the guiding channel 180 penetrate the supporting tube. At least one end of the guiding channel 180 near the first distal end 160 extends along the extension direction of the drainage channel 110, guiding... The channel 180 has an opening 130 in its bore wall, which is configured to allow the bore wall of the guide channel 180 to form a non-closed structure. The width of the opening 130 is smaller than the outer diameter of the visible guide wire. The sidewall of the opening 130 is configured as an elastic structure, and the elastic deformation of the sidewall of the opening 130 allows the visible guide wire to pass through. The push rod has a second distal end and a second proximal end, and the push rod is configured as a flexible or elastic structure. The second distal end and the first proximal end of the support tube are plugged and pulled together. The push rod is used to push the support tube to move along the visible guide wire.
[0049] These embodiments primarily address improvements to a drainage stent for use in the medical field, typically used for the drainage of bodily fluids such as bile and urine. The support tube forms the basic structure of the entire drainage stent, which includes a drainage channel 110 extending from a first distal end 160 to a first proximal end 170, for guiding the outflow of bodily fluids. Furthermore, the support tube also includes a guide channel 180, which, like the drainage channel 110, extends throughout the entire tube. For example, the extending direction of the guide channel 180 and the extending direction of the drainage channel 110 may be partially the same or completely identical.
[0050] A guide channel 180 near the first distal end 160 extends along the direction of the fitting, and its bore wall is provided with an opening 130. The opening 130 on the guide channel 180 is designed as a non-closed structure, allowing a visual guide wire with a certain diameter larger than the width of the opening 130 to pass through. This is because the sidewall of the opening 130 is made of an elastic material, so when a visual guide wire slightly larger than the opening 130 passes through, the opening 130 can be enlarged by applying appropriate force to allow the visual guide wire to pass through and enter the guide channel 180.
[0051] The propulsion rod is a deformable component with a second distal end and a second proximal end. It should be noted that the propulsion rod can be set as an elastic element or a non-elastic element, such as a flexible element, as long as it can deform and transmit thrust to the drainage support; no specific limitation is made here.
[0052] Clearly, by pushing the visual guidewire or support fitting so that the visual guidewire can enter and exit the guide channel 180 from the opening 130, this design allows the drainage stent to be inserted into the visual guidewire without being restricted by the proximal connector. It enables the drainage stent to be guided by the visual guidewire for cannulation, resulting in high surgical efficiency. It also allows doctors to use the visual guidewire during surgery or other treatments to more accurately position and manipulate the drainage stent.
[0053] In use, the doctor first inserts the push rod containing the visual guidewire through the opening 130 of the support tube into the guide channel 180, and adjusts the push rod to the predetermined position so that the limiting part abuts against the end face of the first proximal end 170. This ensures the stability and effectiveness of the thrust transmitted through the push rod to the support tube. Then, using the visual guidewire as a guide, the doctor pushes the drainage stent along the visual guidewire to accurately place the support tube in the body part requiring drainage. Once the support tube reaches the correct position, the push rod can be pulled back to detach it from the support tube, leaving it in the target cavity. Furthermore, because the push rod has deformation capability, it can deform along the extension direction of the visual guidewire to change the direction of the thrust transmitted by the push rod to the support tube in real time, thereby controlling the movement of the support tube along the visual guidewire.
[0054] like Figure 1 As shown, in some embodiments, the support tube includes a support tube 100, a distal one-way limiting part 140 and a proximal one-way limiting part 150, a drainage channel 110 is disposed on the support tube 100 and the drainage channel 110 extends along the axial direction of the support tube 100, and an opening 130 is disposed on the portion of the support tube 100 located at the first distal end 160.
[0055] One end of the distal one-way limiting part 140 is connected to the outer wall of the support tube 100 located at the first distal end 160, and the other end of the distal one-way limiting part 140 gradually moves away from the support tube 100 in the direction away from the first distal end 160.
[0056] One end of the proximal one-way limiting part 150 is connected to the outer wall of the support tube 100 located at the first proximal end 170, and the other end of the proximal one-way limiting part 150 gradually moves away from the support tube 100 in the direction away from the first proximal end 170. The proximal one-way limiting part 150 and the proximal one-way limiting part 150 are provided with a gap in the axial direction of the support tube 100.
[0057] In these embodiments, the design of this drainage stent further refines the structure of the support tube and adds a distal unidirectional limiting portion 140 and a proximal unidirectional limiting portion 150 to enhance the stability of the device within the body. Specifically, the support tube 100 is the core component of the entire drainage stent, and it has an axially extending drainage channel 110 inside, which is used to guide the outflow of intracorporeal fluid and clear blocked cavities. In addition, an opening 130 is provided at the first distal end 160 of the support tube 100 (i.e., the end inserted into the patient's body) to facilitate the introduction of a visual guidewire or other auxiliary tools.
[0058] The distal one-way limiting portion 140 is connected to the outer wall of the first distal end 160 of the support tube 100, and its shape is designed to gradually unfold away from the support tube 100. This design helps prevent the support tube 100 from accidentally slipping out of its target position after placement. When the support tube 100 is correctly placed, the distal one-way limiting portion 140 will naturally conform to the surrounding tissue due to its unique shape, thereby providing additional support and preventing reverse movement.
[0059] Similarly, the proximal one-way limiting portion 150 is also connected to the first proximal end 170 of the support tube 100 (the side closer to the operator), but the direction of action of the proximal one-way limiting portion 150 is opposite, that is, the proximal one-way limiting portion 150 also extends away from the support tube 100. However, it is worth noting that there is a certain axial gap between the distal one-way limiting portion 140 and the proximal one-way limiting portion 150, which means that the two will not directly contact each other, so that the tissue in the target cavity can enter between the proximal one-way limiting portion 150 and the distal one-way limiting portion 140. Then, when the proximal one-way limiting portion 150 contacts the tissue and can block the support tube 100 from further advancement, it means that the support tube 100 has been installed in place. Obviously, the above configuration can replace X-ray imaging to check whether the support tube 100 is installed in place, reducing the damage to the human body caused by X-rays.
[0060] It should be noted that this application utilizes a visual guidewire to pre-observe the length of the cavity that needs to be supported, i.e. the length of the narrow section in the cavity, and then selects a support tube 100 of the corresponding size, thereby ensuring that the support tube 100 is installed in place when it is limited by the distal unidirectional limiting part 140 and the proximal unidirectional limiting part 150.
[0061] like Figure 1 As shown, in some embodiments, both the distal unidirectional limiting portion 140 and the proximal unidirectional limiting portion 150 are configured as elastic structures.
[0062] In these embodiments, when both the distal unidirectional limiting portion 140 and the proximal unidirectional limiting portion 150 are configured as elastic structures, during the insertion process, the distal unidirectional limiting portion 140 and the proximal unidirectional limiting portion 150 can be slightly deformed to smoothly pass through narrower paths or bends; after reaching the target position, the distal unidirectional limiting portion 140 and the proximal unidirectional limiting portion 150 can return to their original shape, providing the necessary support and limiting.
[0063] Furthermore, since the distal unidirectional limiting portion 140 and the proximal unidirectional limiting portion 150 are elastic, they can generate a buffering effect when in contact with surrounding tissues, reducing the risk of damage to the blood vessel wall or other sensitive tissues. In addition, the outer diameter of the support tube 100 can be reduced, facilitating cannulation.
[0064] Meanwhile, the distal unidirectional limiting portion 140 and the proximal unidirectional limiting portion 150 can expand to a certain extent and fit tightly against the surrounding tissue structure, which helps prevent displacement of the drainage stent. In addition, the natural rebound force of the distal unidirectional limiting portion 140 and the proximal unidirectional limiting portion 150 also helps to maintain the stability of the device position.
[0065] In addition, during insertion, the elastic structure makes it easier for the distal unidirectional limiting part 140 and the proximal unidirectional limiting part 150 to pass through narrow spaces; and when the support tube 100 needs to be removed, the elastic properties also allow the distal unidirectional limiting part 140 and the proximal unidirectional limiting part 150 to be compressed, thereby simplifying the removal process.
[0066] For example, in order to achieve the above functions, the distal unidirectional limiting part 140 and the proximal unidirectional limiting part 150 are made of elastic materials with good biocompatibility and appropriate mechanical properties, such as medical-grade silicone and polyurethane.
[0067] In addition, the fatigue life of the materials and the safety of long-term implantation must be considered during the design process to ensure that there will be no breakage or other failures even under long-term use conditions.
[0068] For example, both the distal unidirectional limiting portion 140 and the proximal unidirectional limiting portion 150 can be fixed to the outer wall of the support tube 100 by adhesive bonding. Furthermore, the adhesive bonding can be used to shape both the distal unidirectional limiting portion 140 and the proximal unidirectional limiting portion 150 to deviate from the axial direction of the support tube 100.
[0069] like Figure 1 As shown, in some embodiments, the distal unidirectional limiting part 140 and the proximal unidirectional limiting part 150 are integrated with the support tube 100, and the support tube 100 is configured as an elastic structure.
[0070] In these embodiments, when the distal unidirectional limiting portion 140 and the proximal unidirectional limiting portion 150 are integrated with the support tube 100, and the support tube 100 itself is designed as a flexible structure, this design reduces the number of connection points between components, thereby reducing potential points of failure. This means that the entire drainage bracket is more robust and durable, reducing the risk of components falling off or failing during use.
[0071] Furthermore, the entire support tube (including the limiting part) is made of elastic material, which can better adapt to changes in the patient's internal cavities, such as the curved structures of the common bile duct, cystic duct, pancreatic duct, left hepatic duct, and right hepatic duct. This design not only improves the smoothness of placement but also reduces pressure on surrounding tissues, thus increasing patient comfort.
[0072] Furthermore, the flexible distal unidirectional limiting portion 140 and proximal unidirectional limiting portion 150 can naturally unfold after insertion, closely conforming to the surrounding tissue and providing a stable fixation effect. At the same time, due to the integrated design, pressure can be distributed more evenly, avoiding excessive local compression.
[0073] Clearly, integrated design usually means a simpler production process, as no additional assembly steps are needed to connect the various components. This not only reduces costs but also minimizes quality issues caused by improper assembly.
[0074] For example, the support tube 100 is made of a biocompatible elastic material, such as medical-grade silicone or polyurethane, which can reduce the risk of infection and the incidence of other adverse reactions, ensuring safety for long-term use. Of course, the technology to achieve this design involves precision mold manufacturing, selection of specific thermoplastic or thermosetting materials, and appropriate processing techniques to ensure that the mechanical properties of the final product meet clinical requirements.
[0075] like Figure 1 As shown, in some embodiments, the propulsion rod includes an elastic rod 200 and a limiting part. One end of the elastic rod located at the first distal end can pass through the drainage channel 110. The limiting part is connected to the elastic rod 200, and the limiting part can abut against the end face of the first proximal end for limiting.
[0076] The elastic rod 200 has a large-diameter end 220 and a small-diameter end 210, and a shoulder is formed between the large-diameter end 220 and the small-diameter end 210; wherein, the small-diameter end 210 is located at the second distal end, the large-diameter end 220 is located at the second proximal end, the shoulder is located at the limiting part, the small-diameter end 210 passes through the drainage channel 110, and the shoulder abuts against the end face of the first proximal end 170.
[0077] In these embodiments, a limiting portion is provided at the second distal end, located away from the second distal end but close to the second proximal end. The small-diameter end can be inserted into the drainage channel 110 at the first proximal end 170 of the support tube 100 and can move therein. There is at least one preset position on the movement path at the second distal end, at which the limiting portion contacts the end face of the first proximal end 170 of the support tube 100, forming a fixed positional relationship.
[0078] Clearly, the specific structure of the propulsion rod has been further refined, introducing an elastic rod 200 and specifying the design of the large-diameter end 220, the small-diameter end 210, and the shoulder. This design provides more precise operational control and better mechanical fit. Specifically, the elastic rod 200 is made entirely of an elastic material, allowing it to bend or deform to a certain extent, helping to adapt to the complex paths within the human body cavities, especially when passing through curved sections, where the elastic rod 200 can adaptively bend.
[0079] The large-diameter end 220 is located at the second proximal end of the advance rod, i.e., the side closer to the operator. The larger diameter of the large-diameter end 220 provides a good gripping area, facilitating manipulation by the physician. The small-diameter end 210 is located at the second distal end of the advance rod, i.e., the side farther from the operator. The smaller diameter of the small-diameter end 210 facilitates easier entry into the drainage channel 110 and reduces pressure on surrounding tissues. The shoulder is a stepped structure formed between the large-diameter end 220 and the small-diameter end 210. It is located at the limiting portion, meaning the shoulder is part of the limiting portion, and it is used to limit the insertion length of the small-diameter end 210.
[0080] For example, the elastic rod 200 is configured as an elastic tube, which can further improve its elastic deformation capability.
[0081] like Figure 1 As shown, in some embodiments, the guide channel 180 includes a first guide segment 181 and a second guide segment 182 connected in sequence. The first guide segment 181 is close to the first distal end 160, and the second guide segment 182 is far from the first distal end 160. The drainage channel 110 at least partially overlaps with the first guide segment 181. An opening 130 is provided in the part of the support tube 100 located at the first distal end 160. The opening 130 penetrates the outer wall of the support tube 100 and extends to the end face of the first distal end 160.
[0082] In these embodiments, the guide channel 180 is designed to include two sequentially connected sections: a first guide segment 181 and a second guide segment 182.
[0083] The first guiding segment 181 is located near the first distal end 160 of the support tube, i.e., near the end inserted into the patient's body. The first guiding segment 181 is designed to at least partially overlap with the drainage channel 110, meaning that the drainage channel 110 and the guiding channel 180 share a common portion, thereby allowing a visual guidewire or other auxiliary tools to enter the first guiding segment 181, and then, under the guidance of the visual guidewire, allowing the support tube 100 to enter a body cavity, such as the common bile duct, cystic duct, pancreatic duct, left hepatic duct, right hepatic duct, etc.
[0084] The second guide segment 182 is located away from the first distal end 160 and closer to the first proximal end 170 of the support tube. The second guide segment 182 is used to further stabilize the position of the guide wire or instrument. For example, there is an angle between the first guide segment 181 and the second guide segment 182, which is no greater than 90°, such as 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80°, 90°, etc.
[0085] The opening 130 penetrates the outer wall of the support tube 100 and extends to the end face of the first distal end 160. This opening 130 is designed to allow the visual guidewire to enter the guide channel 180 directly from the outside without first passing through the entire drainage channel 110. Because the sidewalls of the opening 130 are elastic, they can accommodate visual guidewires slightly larger than the width of the opening 130.
[0086] The visual guidewire can directly enter the guide channel 180 and drainage channel 110 from the outside through the opening 130. Clearly, there is no need for the visual guidewire to pass through the advancement rod, thus effectively reducing the outer diameter of the advancement rod and the outer diameter of the support tube 100. It should be noted that one reason why the support tube cannot be thinner in related technologies is that the support tube is inserted into the nipple sphincter through the visual guidewire that runs through the cavity during installation. Furthermore, the guidewire passes through the advancement rod and the support tube, meaning that although the guidewire is withdrawn post-operatively, the thickness of the support tube cannot be changed. Long-term retention in this area puts pressure on the aforementioned special cavity, affecting healing and recovery.
[0087] Obviously, the solution proposed in this application can be matched with an ultra-fine endoscope for direct visualization of the drainage stent placement, and the visual guide wire does not pass through the push rod, but only partially enters the distal end of the drainage channel 110. In other words, the push rod does not need to be provided with a channel for the guide wire to pass through, which can greatly reduce the theoretical minimum outer diameter of the drainage stent.
[0088] like Figure 1 and Figure 2 As shown, in some embodiments, the drainage channel 110 has a side hole 120 in its wall, the side hole 120 penetrates the outer wall of the support tube, the side hole 120 coincides with the second guide section 182, and the opening 130 and the side hole 120 are connected.
[0089] In these embodiments, side holes 120 are provided on the wall of the drainage channel 110, and these side holes 120 penetrate the outer wall of the support tube. The side holes 120 coincide with the second guide section 182, that is, the side hole 120 is the second guide section 182, and the opening 130 and the side holes 120 are connected. By providing side holes 120, drainage can be performed simultaneously from multiple locations, which helps to improve drainage efficiency and prevents the drainage support from losing its function when the main passages at both ends of the support tube 100 are blocked. Especially in some cases, such as in complex biliary structures, a single drainage outlet may not be sufficient to effectively drain all the fluid. That is, the presence of side holes 120 increases the drainage path and reduces the risk of blockage. Even if one side hole 120 is blocked, the other side holes 120 can still continue to work, ensuring continuous and effective drainage.
[0090] Furthermore, the side hole 120 coincides with the second guide section 182, and the side hole 120 communicates with the opening 130. This means that the guidewire or other medical device can enter or exit the guide channel 180 through the opening 130, allowing the visible guidewire to enter the guide channel 180 from the side wall of the support tube 100, i.e., without passing through the push rod. Simply put, the design of the opening 130 communicating with the side hole 120 allows the guidewire or device to enter or exit directly from the outside without having to pass through the entire support tube.
[0091] For example, in the axial direction of the support tube 100, there is a gap between the side hole 120 and the end face of the small diameter end 210 passing through the drainage channel 110, so as to avoid the small diameter end 210 interfering with the entry of the visible guide wire into the guide channel 180 and the drainage channel 110.
[0092] like Figure 3 As shown, in some embodiments, in the extension direction of the opening 130, the opening 130 includes at least two sub-structural segments, and in the direction away from the first distal end 160, the width of any two adjacent sub-structural segments decreases from large to small.
[0093] In these embodiments, the opening 130 is designed along its extension direction to include at least two sub-segments, and the width of these sub-segments gradually decreases in the direction away from the first distal end 160. Because the width of adjacent sub-segments decreases, the visual guidewire or instrument undergoes a gradual tightening process as it passes through the opening 130. This design helps ensure that the visual guidewire or instrument can smoothly enter the guide channel 180, while reducing pressure on the sidewalls of the opening 130 and lowering the risk of damage.
[0094] For example, the opening 130 includes two sub-segments. The sub-segment closer to the first distal end 160 is the first sub-segment 131, and the sub-segment farther from the first distal end 160 is the second sub-segment 132. The width of the first sub-segment 131 gradually decreases in the direction away from the first distal end 160, while the width of the second sub-segment 132 is set to be constant. That is to say, the first sub-segment 131 serves a guiding function.
[0095] like Figure 4 , Figure 5 and Figure 6 As shown, in some embodiments, the guide channel 180 is disposed at the distal one-way limiting part 140, the guide channel 180 extends along the axial direction of the support tube 100, and the opening 130 is disposed on the side of the distal one-way limiting part 140 away from the support tube 100.
[0096] In these embodiments, the guide channel 180 is located in the distal one-way limiting portion 140 and is aligned with the axial extension direction of the support tube 100. That is, by placing the guide channel 180 in the distal one-way limiting portion 140, a visual guidewire or instrument can directly enter the guide channel 180 located in the distal one-way limiting portion 140 through the opening 130, which is equivalent to threading the visual guidewire through the support tube 100, thus guiding the support tube 100. This helps to guide the guidewire or instrument to the predetermined position more accurately. Furthermore, since the drainage channel 110 does not require the insertion of a visual guidewire, the outer diameter of the support tube 100 can be further reduced, which helps to reduce the pressure caused by long-term retention in the aforementioned special cavity, thus promoting healing and recovery.
[0097] For example, in biliary surgery, the drainage stent can be positioned more accurately by the distal one-way limiting part 140, ensuring that it works in the optimal position.
[0098] In some embodiments, the guide channel 180 is disposed on the proximal one-way limiting part 150, the guide channel 180 extends along the axial direction of the support tube 100, and the opening 130 is disposed on the side of the proximal one-way limiting part 150 away from the support tube 100.
[0099] In these embodiments, the function and principle of providing a guide channel 180 in the proximal one-way limiting portion 150 are the same as those of providing a guide channel 180 in the distal one-way limiting portion 140, and will not be described again here.
[0100] like Figure 7 As shown, in some embodiments, the distal one-way limiting part 140 and the proximal one-way limiting part 150 are located on the same side of the support tube 100, and the guide channel 180 extends along the axial direction of the support tube 100. The guide channel 180 includes a first guide section 181 and a second guide section 182. The first guide section 181 is disposed through the distal one-way limiting part 140, and the second guide section 182 is disposed through the proximal one-way limiting part 150. An opening 130 is provided on the side of the distal one-way limiting part 140 and the proximal one-way limiting part 150 away from the support tube 100.
[0101] In these embodiments, the distal one-way limiting portion 140 and the proximal one-way limiting portion 150 are located on the same side of the support tube 100, and the guide channel 180 is divided into two parts: a first guide section 181 and a second guide section 182. The first guide section 181 extends through the distal one-way limiting portion 140, while the second guide section 182 extends through the proximal one-way limiting portion 150.
[0102] The first guide segment 181 is disposed through the distal unidirectional limiting portion 140, aligned with or at a certain angle to the axis of the support tube 100, allowing the visual guidewire or instrument to enter from the distal end. The second guide segment 182 is disposed through the proximal unidirectional limiting portion 150, aligned with or at a certain angle to the axis of the support tube 100, allowing the visual guidewire or instrument to enter or exit the first guide segment 181 and the second guide segment 182. Clearly, the design of the distal unidirectional limiting portion 140 and the proximal unidirectional limiting portion 150 provides additional support, helping to maintain the stability of the drainage stent's position. Simultaneously, the segmented guide channel 180 can better fix the guidewire or instrument, and the bilateral limiting provides a stronger limiting effect on the visual guidewire during insertion. When the visual guidewire is withdrawn, the distal unidirectional limiting portion 140 is blocked by tissue and cooperates with the withdrawal of the visual guidewire; the support tube 100 also cannot move proximally due to the action of the distal unidirectional limiting portion 140.
[0103] For example, the distal unidirectional limiting portion 140 and the proximal unidirectional limiting portion 150 can be directly cut from a portion of the support tube 100. Their flexibility allows them to form an angle with the support tube 100 and achieve their function, further simplifying the structure. To prevent problems such as difficulty in pulling out or insufficient support force, adhesive can be applied to the outer side of the junction between the distal unidirectional limiting portion 140 and the proximal unidirectional limiting portion 150 and the support tube 100 to create a certain initial angle, even if the distal unidirectional limiting portion 140 and the proximal unidirectional limiting portion 150 deviate from the outer wall of the support tube 100.
[0104] In some embodiments, this application also provides an ultra-thin endoscopic surgical system, which includes a visual guidewire and a drainage stent as described in any of the above embodiments, wherein the visual guidewire is an ultra-thin endoscope, and the visual guidewire is at least partially inserted through the distal portion of the guide channel 180.
[0105] Since the aforementioned drainage stent has the aforementioned technical effects, the ultra-thin endoscopic surgical system including the drainage stent should have the same technical effects, which will not be elaborated here.
[0106] In all examples shown and described herein, any specific values should be interpreted as merely exemplary and not as limitations; therefore, other examples of exemplary embodiments may have different values.
[0107] 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.
[0108] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application.
Claims
1. A drainage stent, characterized in that, The drainage stent comprises: a support tube having a first distal end, a first proximal end, a drainage channel and a guide channel, the drainage channel extending from the first distal end to the first proximal end, and the drainage channel and the guide channel both penetrating through the support tube, at least one end of the guide channel near the first distal end extending along the extension direction of the drainage channel, the hole wall of the guide channel having an opening, the opening being configured to enable the hole wall of the guide channel to form a non-closed structure, and the width of the opening being smaller than the outer diameter of the visible guide wire, the side wall of the opening being provided in an elastic structure, and the elastic deformation of the side wall of the opening being able to pass the visible guide wire; a push rod having a second distal end and a second proximal end, and the push rod being provided in a flexible or elastic structure, the second distal end and the first proximal end of the support tube being plug-connected, and the push rod being used to push the support tube to move along the visible guide wire.
2. The drainage stent of claim 1, wherein, The support tube comprises: a support tube, the drainage channel being arranged in the support tube, and the drainage channel extending along the axial direction of the support tube; a distal one-way limiting part, one end of the distal one-way limiting part being connected to the outer wall of the support tube at the first distal end, and the other end of the distal one-way limiting part gradually moving away from the support tube in the direction away from the first distal end; a proximal one-way limiting part, one end of the proximal one-way limiting part being connected to the outer wall of the support tube at the first proximal end, and the other end of the proximal one-way limiting part gradually moving away from the support tube in the direction away from the first proximal end, and the proximal one-way limiting part and the proximal one-way limiting part being provided with a gap in the axial direction of the support tube.
3. The drainage stent of claim 2, wherein, Both the distal one-way limiting part and the proximal one-way limiting part are provided in an elastic structure.
4. The drainage stent of claim 3, wherein, The distal one-way limiting part and the proximal one-way limiting part are respectively integrally arranged with the support tube, and the support tube is provided in an elastic structure.
5. The drainage stent of claim 1, wherein, The push rod comprises: an elastic rod, one end of the elastic rod at the first distal end being capable of penetrating the drainage channel; a limiting part, the limiting part being connected to the elastic rod, and the limiting part being capable of abutting against the end face of the first proximal end for limiting.
6. The drainage stent of claim 5, wherein, The elastic rod has a large-diameter end and a small-diameter end, the small-diameter end being arranged at the second distal end, the large-diameter end being arranged at the second proximal end, the small-diameter end being capable of penetrating the drainage channel, an axial shoulder being formed between the large-diameter end and the small-diameter end, the axial shoulder being capable of abutting against the end face of the first proximal end, and the part of the axial shoulder contacting the first proximal end forming the limiting part.
7. The drainage stent of any one of claims 2 to 4, wherein, The guide channel comprises a first guide segment and a second guide segment which are sequentially communicated, the first guide segment being close to the first distal end, the second guide segment being away from the first distal end, the drainage channel at least partially coinciding with the first guide segment, the opening being arranged at the part of the support tube at the first distal end, the opening penetrating through the outer wall of the support tube, and the opening extending to the end face of the first distal end.
8. The drainage stent of claim 7, wherein, The hole wall of the drainage channel is provided with a side hole penetrating through the outer wall of the support tube, the side hole coincides with the second guide section, and the opening and the side hole are in communication.
9. The drainage stent of claim 8, wherein, In the extension direction of the opening, the opening comprises at least two sub-structure sections, and in the direction away from the first distal end, the width of any two adjacent sub-structure sections changes from large to small.
10. The drainage stent of any one of claims 2-4, wherein, The guide channel is arranged at the distal one-way limiting part, the guide channel extends along the axial direction of the support tube, and the opening is arranged on the side of the distal one-way limiting part away from the support tube. Or, the guide channel is arranged at the proximal one-way limiting part, the guide channel extends along the axial direction of the support tube, and the opening is arranged on the side of the proximal one-way limiting part away from the support tube. Or, the distal one-way limiting part and the proximal one-way limiting part are located on the same side of the support tube, the guide channel extends along the axial direction of the support tube, the guide channel comprises a first guide section and a second guide section, the first guide section penetrates through the distal one-way limiting part, the second guide section penetrates through the proximal one-way limiting part, and the side of the distal one-way limiting part and the proximal one-way limiting part away from the support tube is provided with the opening.
11. An ultrathin endoscopic surgical system, comprising: The ultra-fine endoscope surgery system comprises a visible guide wire and the drainage stent according to any one of claims 1 to 10, the visible guide wire is an ultra-fine endoscope, and the visible guide wire is at least partially arranged in the distal part of the guide channel.