A dilator guide sheath assembly

Abstract

The utility model provides an expander guide sheath subassembly belongs to expander guide sheath subassembly technical field, include: guide sheath, it includes guide pipe, the guide pipe is provided with guide channel, the guide sheath forms has straight line portion and curved portion, the straight line portion is connected with curved portion, the expander includes expansion pipe, the expansion pipe can be inserted guide channel from the guide pipe on close to one end of straight line portion and can be worn from the guide pipe on close to one end of curved portion, the expansion pipe is linear structure. The curved portion of utility model has passive bending characteristic, can be in the natural cavity of human body, the physiological bending path of compliance cavity changes, to realize low resistance, low trauma's anterograde insertion, when the linear expansion pipe of expander is inserted from the straight line portion end of guide pipe, realizes from " curved through state " to " linear working channel " dynamic conversion, provides reliable passage for subsequent treatment instrument.

Description

Technical Field

[0001] This utility model belongs to the technical field of expander guide sheath assembly, and relates to an expander guide sheath assembly. Background Technology

[0002] In urology, interventional vascular surgery, and endoscopic procedures, the guiding sheath serves as an important interventional access device, widely used for the introduction of therapeutic instruments such as ureteroscopes, nephroscopes, and catheters. Its function is to establish a stable, reusable pathway, reduce damage to human tissues from repeated instrument punctures, and improve surgical efficiency.

[0003] In existing technologies, guiding sheaths typically employ rigid or semi-rigid straight tube structures, used in conjunction with dilators. However, when navigating complex anatomical pathways such as the urethra and ureter into the renal collecting system, these straight guiding sheaths present significant limitations. On one hand, the ureter itself has a narrow and highly curved physiological structure, with considerable individual variations in the degree of curvature. Rigid guiding sheaths are prone to scraping against the body's tissue walls during advancement, leading to mucosal damage, bleeding, or even perforation. These medical risks are particularly high in elderly patients or cases of ureteral stenosis. On the other hand, in clinical practice, to successfully navigate the curved sections of the body, medical staff often need to repeatedly construct a guiding path that meets the requirements of the clinical procedure using a guiding wire. This process is cumbersome and time-consuming, causing unnecessary pain to patients and a heavy workload for medical staff.

[0004] Specifically, the conventional guiding sheath is positioned at the ureter orifice and cannot enter the kidney, which is where the path to the kidney needs to be. This is because the path to the kidney requires a "bend-straight-bend" route, which cannot be achieved by conventional straight guiding sheaths or ordinary curved guiding sheaths, leaving considerable room for improvement. Summary of the Invention

[0005] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing an expander guide sheath assembly.

[0006] The objective of this utility model can be achieved through the following technical solution: an expander guide sheath assembly, comprising:

[0007] A guide sheath includes a guide tube having a guide channel, the guide sheath having a straight portion and a curved portion connected to the curved portion, the straight portion and the curved portion being located at opposite ends of the guide tube;

[0008] An expander includes an expansion tube that can be inserted into the guide channel from one end of the guide tube near the straight portion and can exit from one end of the guide tube near the curved portion. The expansion tube has a straight structure. When the expansion tube is inserted into the guide channel and moves in a direction from the straight portion toward the curved portion, it pushes the inner wall of the guide channel in the curved portion, thereby straightening the guide tube.

[0009] In one of the aforementioned expander guide sheath assemblies, one end of the guide tube near the bend is obliquely cut to form an oblique end face, which is inclined relative to the axis of the bend.

[0010] In one of the aforementioned expander guide sheath assemblies, the distal end of the beveled end face is flattened to form a safety flathead.

[0011] In one of the aforementioned expander guide sheath assemblies, the expander tube is formed with a guide bevel.

[0012] In one of the expander guide sheath assemblies described above, the guide sheath further includes a guide seat, and the guide tube is connected to the guide seat. The expander further includes an expansion seat, and the expansion tube is connected to the expansion seat. The expansion seat can move closer to or further away from the guide seat, thereby driving the expansion tube to be inserted into the guide channel.

[0013] In the above-mentioned expander guide sheath assembly, the guide seat is provided with a first connecting portion, and the expansion seat is provided with a second connecting portion. The first connecting portion is detachably connected to the second connecting portion. When the first connecting portion is connected to the second connecting portion, the expansion tube is inserted into the guide channel from one end of the guide tube near the straight portion and exits from one end of the guide tube near the curved portion.

[0014] In the aforementioned expander guide sheath assembly, the first connecting part is configured as a first hook, and the second connecting part is configured as a slot, wherein the first hook can engage with the slot.

[0015] In one of the aforementioned expander guide sheath assemblies, a waterproof cover is also included. The waterproof cover forms a waterproof channel through which the expansion tube can pass. The waterproof cover is connected to the guide seat and forms a guide cavity. Both the waterproof channel and the guide channel are in communication with the guide cavity.

[0016] In one of the expander guide sheath assemblies described above, the guide seat is provided with a third connecting portion, and the waterproof cover is provided with a fourth connecting portion, the fourth connecting portion being detachably connected to the third connecting portion.

[0017] In the aforementioned expander guide sheath assembly, the third connecting part is configured as a locking groove, and the fourth connecting part is configured as a locking block. The locking groove includes an unlocking channel distributed along the axial direction of the guide seat and a locking channel distributed along the circumferential direction of the guide seat. One end of the unlocking channel is connected to one end of the locking channel, and the other end of the unlocking channel is connected to the outside. The locking block can enter the locking channel from the outside along the unlocking channel, or retract from the locking channel back to the outside along the unlocking channel.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows: By setting a guide tube structure with a straight part and a curved part connected in the guide sheath, wherein the curved part has passive bending characteristics, it can deform in accordance with the physiological curvature of the cavity when entering the natural cavity of the human body (such as the ureter), thereby achieving low resistance and low trauma antegrade insertion, improving the passability of the guide sheath in the tortuous and narrow natural cavity of the human body, and avoiding problems such as mucosal scratches, perforation or difficulty in advancement caused by the front end; when the straight expansion tube of the dilator is inserted from the straight part end of the guide tube and pushed along the guide channel towards the curved part, the expansion tube contacts the inner wall of the curved part and applies radial support force, thereby actively pushing the curved part to gradually straighten, realizing the dynamic conversion from "curved passage state" to "straight working channel". Attached Figure Description

[0019] Figure 1 This is a schematic diagram showing the state of the guide sheath of this utility model not being inserted into the expansion tube seat.

[0020] Figure 2 This is an exploded view of the guide sheath of this utility model before it is inserted into the expansion tube seat.

[0021] Figure 3 This is a top view of the guide sheath of this utility model before it is inserted into the expansion tube seat.

[0022] Figure 4 for Figure 3 A cross-sectional view from the perspective of AA.

[0023] Figure 5 for Figure 4 An enlarged view of part B.

[0024] Figure 6 This is a schematic diagram showing the state of the guide sheath inserted into the expansion tube seat according to this utility model.

[0025] Figure 7 This is a top view of the guide sheath inserted into the expansion tube seat of this utility model.

[0026] Figure 8 for Figure 7 A cross-sectional view from the CC perspective.

[0027] Figure 9 for Figure 8 An enlarged view of part D.

[0028] In the diagram, 100 is the guide sheath; 110 is the guide tube; 111 is the guide channel; 112 is the straight section; 113 is the curved section; 114 is the beveled end face; 115 is the safety flat head; 120 is the guide seat; 121 is the first hook; 122 is the locking groove; 123 is the unlocking channel; 124 is the locking channel; 200 is the expander; 210 is the expansion tube; 211 is the guide bevel; 220 is the expansion seat; 221 is the second hook; 300 is the waterproof cover; 310 is the waterproof channel; 320 is the guide cavity; and 330 is the locking block. Detailed Implementation

[0029] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0030] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0031] Furthermore, in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0034] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0035] like Figures 1-9 As shown, an expander guide sheath assembly includes: a guide sheath 100 and an expander 200.

[0036] The guide sheath 100 includes a guide tube 110, the guide tube 110 is provided with a guide channel 111, the guide sheath 100 is formed with a straight portion 112 and a curved portion 113, the straight portion 112 and the curved portion 113 are connected, and the straight portion 112 and the curved portion 113 are respectively located at both ends of the guide tube 110.

[0037] The expander 200 includes an expansion tube 210, which can be inserted into the guide channel 111 from one end of the guide tube 110 near the straight portion 112 and can exit from one end of the guide tube 110 near the curved portion 113. The expansion tube 210 has a straight structure. When the expansion tube 210 is inserted into the guide channel 111 and moves in the direction from the straight portion 112 toward the curved portion 113, it pushes the inner wall of the guide channel 111 in the curved portion 113, thereby straightening the guide tube 110.

[0038] In this embodiment, a guide tube 110 structure is provided in the guide sheath 100, which connects the straight portion 112 and the curved portion 113. The curved portion 113 has passive bending characteristics and can deform in accordance with the physiological curvature of the cavity, thereby achieving low-resistance and low-trauma antegrade insertion. This improves the passability of the guide sheath 100 in the tortuous and narrow natural cavities of the human body and avoids problems such as mucosal scratches, perforations, or difficulty in advancement caused by the front end. When the straight expansion tube 210 of the dilator 200 is inserted from the straight portion 112 end of the guide tube 110 and advanced along the guide channel 111 toward the curved portion 113, the expansion tube 210 contacts the inner wall of the curved portion 113 and applies radial support force, thereby actively pushing the curved portion 113 to gradually straighten, realizing a dynamic conversion from "curved passage state" to "straight working channel".

[0039] In the specific implementation process, taking the kidney as an example, the guide sheath 100 is first shaped and bent, and then the dilator 210 enters the guide sheath 100 to straighten the guide sheath 100 so as to facilitate entry into the human body passage. After reaching the kidney, the dilator 210 is pulled out. Due to the shaping effect, the head of the guide sheath 100 will spring back to the original shaped position, that is, adapt to the "bend-straight-bend" path, so that the endoscope can be smoothly passed through the guide sheath 100 to enter the kidney.

[0040] like Figures 1-9 As shown, based on the above embodiment, the guide tube 110 is obliquely cut at one end near the bend 113 to form an oblique end face 114, and the oblique end face 114 is inclined relative to the axis of the bend 113.

[0041] In this embodiment, the end of the guide tube 110 near the bend 113 is obliquely cut to form an oblique end face 114, which can play a smooth guiding role when inserted into tissue or cavity, reduce the scraping and resistance of the front end to the tissue, avoid damage to the mucosa or blood vessel wall, improve the safety and compliance of the insertion process, and at the same time help the guide tube 110 to smoothly enter the target position.

[0042] like Figures 1-9 As shown, based on the above embodiment, the distal end of the beveled end face 114 is flattened to form a safety flat head 115.

[0043] In this embodiment, the distal end of the beveled end face 114 is flattened to form a safety flat head 115, which retains the guiding function of the beveled end face and avoids the risk of perforation, puncture or tissue tearing that may be caused by the sharp end.

[0044] like Figures 1-9 As shown, based on the above embodiment, the expansion tube 210 is formed with a guide angle 211.

[0045] In this embodiment, the front end of the expansion tube 210 is formed with a guide bevel 211, which can play a pre-guiding and buffering role when it is inserted into the guide channel 111 or contacts the tissue, reduce the pushing resistance, prevent the front end of the expansion tube 210 from getting stuck or hitting the inner wall of the guide tube 110 and causing damage, improve the stability and reliability of the expansion process, and extend the service life of the device.

[0046] like Figures 1-9 As shown, based on the above embodiment, the guide sheath 100 further includes a guide seat 120, the guide tube 110 is connected to the guide seat 120, the expander 200 further includes an expansion seat 220, the expansion tube 210 is connected to the expansion seat 220, and the expansion seat 220 can move closer to or further away from the guide seat 120 to drive the expansion tube 210 to be inserted into the guide channel 111.

[0047] In this embodiment, by setting the guide seat 120 and the expansion seat 220, both the guide sheath 100 and the expander 200 are controlled. The operator can achieve precise advancement and withdrawal by holding the guide seat 120 and the expansion seat 220.

[0048] like Figures 1-9 As shown, based on the above embodiment, the guide seat 120 is provided with a first connecting part, and the expansion seat 220 is provided with a second connecting part. The first connecting part is detachably connected to the second connecting part. When the first connecting part is connected to the second connecting part, the expansion tube 210 is inserted into the guide channel 111 from one end of the guide tube 110 near the straight part 112 and exits from one end of the guide tube 110 near the curved part 113.

[0049] In this embodiment, the detachable connection between the first connecting part and the second connecting part allows the dilator 200 to quickly and accurately dock with the guide sheath 100, ensuring the coaxial alignment of the dilator tube 210 and the guide channel 111, and avoiding misalignment that could lead to instrument damage or operational failure.

[0050] like Figures 1-9 As shown, based on the above embodiment, the first connecting part is configured as a first hook 121, and the second connecting part is configured as a slot, wherein the first hook 121 can be engaged with the slot.

[0051] In this embodiment, a hook-hook interlocking connection is adopted to achieve quick locking and stable connection between the guide seat 120 and the expansion seat 220. The connection process does not require additional tools and can be completed with one hand. After connection, it is not easy to loosen, ensuring stable force transmission during expansion and improving the safety and convenience of operation.

[0052] like Figures 1-9 As shown, based on the above embodiment, a waterproof cover 300 is also included. The waterproof cover 300 forms a waterproof channel 310. The expansion tube 210 can pass through the waterproof channel 310. The waterproof cover 300 is connected to the guide seat 120 and forms a guide cavity 320. The waterproof channel 310 and the guide channel 111 are both connected to the guide cavity 320.

[0053] In this embodiment, a waterproof cover 300 is provided to effectively seal the connection area between the guide seat 120 and the dilation seat 220, preventing liquid from seeping into the operating area or contaminating the hands along the outer wall of the dilation tube 210, maintaining a clear surgical field and a dry operating environment. The interconnected design of the guide cavity 320 ensures unobstructed passage of instruments, taking into account both sealing and functionality, and is suitable for interventional surgery in a humid environment.

[0054] like Figures 1-9As shown, based on the above embodiment, the guide seat 120 is provided with a third connecting part, and the waterproof cover 300 is provided with a fourth connecting part, the fourth connecting part being detachably connected to the third connecting part.

[0055] In this embodiment, the fourth connecting part is detachably connected to the third connecting part, which facilitates quick installation before surgery or disassembly for cleaning / replacement after surgery, without affecting the overall sealing performance, and the structure is flexible.

[0056] like Figures 1-9 As shown, based on the above embodiment, the third connecting part is configured as a locking groove 122, and the fourth connecting part is configured as a locking block 330. The locking groove 122 includes an unlocking channel 123 distributed along the axial direction of the guide seat 120 and a locking channel 124 distributed circumferentially along the guide seat 120. One end of the unlocking channel 123 is connected to one end of the locking channel 124, and the other end of the unlocking channel 123 is connected to the outside. The locking block 330 can enter the locking channel 124 from the outside along the unlocking channel 123, or retreat from the locking channel 124 back to the outside along the unlocking channel 123.

[0057] In this embodiment, the locking groove 122 and the locking block 330 adopt an L-shaped groove structure of "axial insertion + circumferential rotation locking" to achieve quick installation and reliable locking of the waterproof cover 300. The connection method has an anti-disengagement design, is easy to operate, and only requires insertion and rotation to complete the locking. No additional fasteners are needed. The seal is stable and easy to disassemble, which significantly improves the reliability of the waterproof cover 300.

Claims

1. An expander guide sheath assembly, characterized in that, include: A guide sheath includes a guide tube having a guide channel, the guide sheath having a straight portion and a curved portion connected to the curved portion, the straight portion and the curved portion being located at opposite ends of the guide tube; An expander includes an expansion tube that can be inserted into the guide channel from one end of the guide tube near the straight portion and can exit from one end of the guide tube near the curved portion. The expansion tube has a straight structure. When the expansion tube is inserted into the guide channel and moves in a direction from the straight portion toward the curved portion, it pushes the inner wall of the guide channel in the curved portion, thereby straightening the guide tube.

2. The expander guide sheath assembly as claimed in claim 1, characterized in that: The guide tube has a beveled end face near the bend, which is inclined relative to the axis of the bend.

3. The expander guide sheath assembly as described in claim 2, characterized in that: The distal end of the beveled end face is flattened to form a safety flat head.

4. The expander guide sheath assembly as claimed in claim 1, characterized in that: The expansion tube is formed with a guide bevel.

5. The expander guide sheath assembly as claimed in claim 1, characterized in that: The guide sheath also includes a guide seat, and the guide tube is connected to the guide seat. The expander also includes an expansion seat, and the expansion tube is connected to the expansion seat. The expansion seat can move closer to or further away from the guide seat, thereby driving the expansion tube to be inserted into the guide channel.

6. The expander guide sheath assembly as claimed in claim 5, characterized in that: The guide seat is provided with a first connecting part, and the expansion seat is provided with a second connecting part. The first connecting part is detachably connected to the second connecting part. When the first connecting part is connected to the second connecting part, the expansion tube is inserted into the guide channel from one end of the guide tube near the straight part and exits from one end of the guide tube near the curved part.

7. The expander guide sheath assembly as claimed in claim 6, characterized in that: The first connecting part is configured as a first hook, and the second connecting part is configured as a second hook, wherein the first hook can engage with the second hook.

8. The expander guide sheath assembly as claimed in claim 5, characterized in that: It also includes a waterproof cover, which forms a waterproof channel through which the expansion tube can pass. The waterproof cover is connected to the guide seat and forms a guide cavity. Both the waterproof channel and the guide channel are in communication with the guide cavity.

9. The expander guide sheath assembly as claimed in claim 8, characterized in that: The guide seat is provided with a third connecting part, and the waterproof cover is provided with a fourth connecting part, the fourth connecting part being detachably connected to the third connecting part.

10. An expander guide sheath assembly as claimed in claim 9, characterized in that: The third connecting part is configured as a locking groove, and the fourth connecting part is configured as a locking block. The locking groove includes an unlocking channel distributed along the axial direction of the guide seat and a locking channel distributed along the circumferential direction of the guide seat. One end of the unlocking channel is connected to one end of the locking channel, and the other end of the unlocking channel is connected to the outside. The locking block can enter the locking channel from the outside along the unlocking channel, or retreat from the locking channel back to the outside along the unlocking channel.

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