Dilator, ureter sheath and endoscope assembly

Abstract

The utility model discloses a dilator, a ureter sheath and an endoscope assembly, and relates to the technical field of medical instruments. The dilator disclosed by the utility model is used for the ureter sheath. The dilator comprises a dilation tube and a clamp, the clamp comprises a base portion and at least two clamping arms distributed in the circumferential direction of the base portion, and the clamp can be connected with the near end of a sheath tube of the ureter sheath through the clamping arms; the base part is provided with a mounting hole, the near end of the dilation tube penetrates through the mounting hole, and the near end of the dilation tube and the base part are clamped, positioned and matched in the axial direction and the circumferential direction of the dilator. The scheme at least can be used for improving the smoothness of the insertion action of the ureter sheath.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a dilator, a ureteral sheath and an endoscope assembly. Background Art

[0002] Ureteral sheaths are used in urological endoscopic examinations or surgeries. They can establish an inspection / surgical channel in the urinary system to assist the endoscope and surgical instruments in passing through the urethra, ureter and other cavities, thereby improving the effectiveness and safety of examination and treatment.

[0003] In the related art, the ureteral sheath includes a sheath tube and a dilator. During the insertion of the ureteral sheath, the dilator uses its distal conical head to prop open the cavity wall to smoothly insert the sheath tube, and then withdraws the dilator to establish a working channel for the nephroscope or ureteroscope. However, in practice, even with the use of a dilator, the insertion process of the ureteral sheath is still not smooth enough. Utility Model Content

[0004] The present application provides a dilator, a ureteral sheath and an endoscope assembly, which can at least be used to improve the smoothness of the ureteral sheath insertion action.

[0005] In a first aspect, an embodiment of the present application provides a dilator for a ureteral sheath.

[0006] The dilator includes a dilator tube and a clamp, wherein: the clamp includes a base and at least two clamping arms distributed circumferentially along the base, and the clamp can be connected to the proximal end of the sheath tube of the ureteral sheath through the clamping arms; the base has a mounting hole, and the proximal end of the dilator tube is inserted into the mounting hole, and in the axial and circumferential directions of the dilator, the proximal end of the dilator tube and the base are both clamped and positioned.

[0007] In some embodiments of the present application, the base includes a first positioning rib and a second positioning rib arranged on the wall of the mounting hole, the first positioning rib is extended along the axial direction of the mounting hole to achieve circumferential clamping positioning of the proximal end of the expansion tube, and the second positioning rib is extended along the circumference of the mounting hole to achieve axial clamping positioning of the proximal end of the expansion tube.

[0008] In some embodiments of the present application, the first positioning rib is connected to the second positioning rib.

[0009] In some embodiments of the present application, the second positioning rib is disposed at a distal opening of the mounting hole, and a distal surface of the second positioning rib is coplanar with a distal surface of the base.

[0010] In some embodiments of the present application, the base includes a positioning portion provided on the wall of the mounting hole, and an extension direction of at least a portion of the positioning portion intersects with the axial direction of the mounting hole to simultaneously achieve axial and circumferential clamping positioning of the proximal end of the expansion tube.

[0011] In some embodiments of the present application, the expansion tube includes a first tube body and an adapter, the adapter is fixedly mounted at the distal end of the first tube body, and the expansion tube is connected to the base via the adapter.

[0012] In a second aspect, an embodiment of the present application provides a ureteral sheath, comprising a sheath tube and the dilator described in the first aspect of the embodiment of the present application, wherein the dilator tube can be plugged into and fitted into the sheath tube, and the clamp can be connected to the proximal end of the sheath tube via a clamping arm.

[0013] In some embodiments of the present application, the sheath includes a second tube body and a connecting seat fixedly installed on the proximal end of the second tube body, and the clamp can be connected to the connecting seat through a clamping arm; in the outer peripheral wall of the connecting seat and the clamping arm, one is provided with a positioning protrusion and the other is provided with a positioning recess, and the positioning protrusion can be clamped in the positioning recess to position the clamp and the connecting seat in a circumferential direction.

[0014] In some embodiments of the present application, the positioning protrusion is arranged on the connecting seat, and the positioning recess is arranged on the clamping arm; a guide groove is arranged on the clamping arm, the guide groove extends along the circumference of the clamp, and the guide groove corresponds to the positioning recess, so that the positioning protrusion slides into the positioning recess through the guide groove.

[0015] In some embodiments of the present application, the bottom surface of the guide groove is a first guide surface, and the first guide surface is used to guide the positioning protrusion to slide into the positioning recess.

[0016] In some embodiments of the present application, the sheath includes a second tube body and a connecting seat fixedly installed on the proximal end of the second tube body, and the clamp can be connected to the connecting seat through a clamping arm; the inner wall of the connecting seat is provided with a second guide surface, and the second guide surface is used to guide the expander to slide into the second tube body, and the base has an abutment surface provided on its proximal edge, and when the clamp is connected to the connecting seat, the base abuts against the second guide surface through the abutment surface.

[0017] In some embodiments of the present application, when the clamp is connected to the connecting seat, along the radial direction of the clamp, the portion where the clamping arm clamps the outer peripheral wall of the connecting seat is arranged corresponding to the abutting surface.

[0018] In a third aspect, an embodiment of the present application provides an endoscope assembly, comprising an endoscope and the ureteral sheath described in the second aspect of the embodiment of the present application, wherein the insertion portion of the endoscope can be plugged into and fit into the sheath tube.

[0019] The technical solution adopted in the embodiments of the present application can achieve the following beneficial effects:

[0020] In the dilator disclosed in the embodiment of the present application, the proximal end of the dilator tube and the base of the clamp are simultaneously engaged and positioned along the circumference and axial direction of the dilator, and such a layout makes the dilator tube and the base relatively fixed along the circumference of the dilator. During the insertion of the ureteral sheath, the dilator of the embodiment of the present application can realize the rotation of the entire dilator by rotating one of the clamp or the dilator tube, which can drive the distal end head of the dilator to rotate, and utilize the relative displacement between the dilator and the cavity wall to change the friction resistance from sliding friction to rolling friction, thereby alleviating the problem of insertion obstruction and improving the smoothness of the ureteral sheath insertion action.

[0021] In addition, because the expansion tube and the clamp are positioned and matched along the circumference of the expander, even if the proximal end of the expansion tube is hidden in the base of the clamp, the entire expander can still be rotated by rotating the clamp. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0023] In the attached picture:

[0024] Figure 1 It is a schematic diagram of the structure of the ureteral sheath disclosed in some embodiments of the present application when the dilator is separated from the sheath;

[0025] Figure 2 A schematic diagram of the installation of the expander disclosed in some embodiments of the present application;

[0026] Figure 3 A schematic diagram of the structure of the expander disclosed in some embodiments of the present application;

[0027] Figure 4 A schematic diagram of the structure of a sheath tube disclosed in some embodiments of the present application;

[0028] Figure 5 It is a schematic diagram of the structure of the ureteral sheath disclosed in some embodiments of the present application when the dilator and the sheath are in cooperation;

[0029] Figure 6 and Figure 7 Cross-sectional views of the ureteral sheath at different viewing angles disclosed in some embodiments of the present application.

[0030] Description of reference numerals:

[0031] 100-dilator,

[0032] 110-expansion tube, 111-first tube body, 112-adapter, 112a-first positioning groove, 120-clip, 121-base, 121a-mounting hole, 121b-first positioning rib, 121c-second positioning rib, 121d-abutment surface, 122-clamping arm, 122a-positioning recess, 122b-guide groove, 122c-first guide surface,

[0033] 200-sheath,

[0034] 210 - second tube body, 220 - connecting seat, 221 - positioning protrusion, 222 - second guide surface. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in conjunction with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0036] In each embodiment of the present application, "proximal" and "distal" refer to the position of the endoscope and its components and accessories (such as ureteral sheath) relative to the user in the use environment, wherein the end closer to the user is designated as the "proximal" and the end farther from the user is designated as the "distal".

[0037] In order to facilitate understanding of the dilator, ureteral sheath and endoscope assembly provided in the embodiments of the present application, the relevant technologies are first introduced in conjunction with the application scenarios.

[0038] During the use of the dilator of the related art, even if the dilator is used to open the cavity wall of the urinary system for insertion, it may still be difficult to insert due to insufficient smoothness and excessive resistance.

[0039] After research, the inventors found that the above problems are mainly caused by excessive sliding friction between the dilator and the cavity wall. Specifically, during the insertion of the relevant ureteral sheath, the dilator is usually pushed along the extension direction of the cavity of the urinary system, so that the dilator is subjected to greater sliding friction when stretching the cavity wall, making insertion more difficult. In particular, when entering a narrow cavity (such as the ureter), the friction resistance is further increased, making it more difficult to insert the ureteral sheath.

[0040] In addition, the above-mentioned insertion obstruction will also increase the risk of the ureteral sheath scratching the cavity wall, which may easily lead to a stress response in the patient.

[0041] In view of this, an embodiment of the present application provides a dilator for a ureteral sheath.

[0042] See also Figure 1 to Figure 7 The dilator 100 disclosed in the embodiment of the present application includes a dilator tube 110 and a clamp 120, wherein: the clamp 120 includes a base 121 and at least two clamping arms 122 distributed circumferentially along the base 121, and the clamp 120 can be connected to the proximal end of the sheath tube 200 of the ureteral sheath through the clamping arms 122; the base 121 has a mounting hole 121a, and the proximal end of the dilator tube 110 is inserted into the mounting hole 121a, and in the axial and circumferential directions of the dilator 100, the proximal end of the dilator tube 110 and the base 121 are both clamped and positioned.

[0043] It should be understood that the expansion tube 110 is the main part of the expander 100, which can be inserted from the proximal end of the sheath tube 200 and extend to the distal end of the sheath tube 200, so that it can provide an expansion effect outside the distal end of the sheath tube 200, that is, to open the cavity wall in the human body cavity to facilitate the overall insertion of the ureteral sheath. The clamp 120 is a connecting structure between the expansion tube 110 and the sheath tube 200.

[0044] The clamp 120 is sleeved around the expansion tube 110 through the mounting hole 121a on the base 121, so that the clamping arm 122 in the circumferential direction thereof is convenient for clamping the proximal end of the sheath tube 200 which is also sleeved on the outer circumference of the expansion tube 110. Regarding the layout of the clamping arm 122, illustratively, the clamping arm 122 includes at least two clamping arms 122 arranged opposite to each other in the circumferential direction of the base 121, so that the operator can press the two clamping arms 122 toward each other with his hands to open the free ends of the bottom of the clamping arms 122, so as to facilitate clamping on the proximal end of the sheath tube 200, such as Figure 1 and Figure 5 As shown, it can be specifically clamped on the connecting seat 220 at the proximal end of the sheath tube 200.

[0045] As described in the embodiment of the present application, along the axial direction of the dilator 100, the proximal end of the dilator tube 110 and the base 121 are engaged and positioned, so that the two can be relatively fixed in this direction, that is, the two will not move relative to each other. In this case, during the insertion of the ureteral sheath, the dilator tube 110 can be fixed to the sheath tube 200 by the clamp 120, and even if the dilator 100 and the sheath tube 200 are both subject to resistance generated between the cavity wall, the two will not move relative to each other, so that the sheath tube 200 is inserted along with the dilator 100 until it reaches the target site to establish a surgical channel.

[0046] In order to reduce the resistance during the insertion of the ureteral sheath, the ureteral sheath can be rotated. When the dilator 100 is controlled to rotate, rolling friction is formed between its distal end and the cavity wall instead of sliding friction. The friction coefficient of the former is smaller, which can reduce the resistance and alleviate the obstruction of the ureteral sheath, so as to facilitate the insertion operation. However, although the dilator 110 and the clamping member of the related art are coaxially sleeved, the two can rotate relative to each other. Because the proximal end of the dilator 100 is either hidden in the base 121 of the clamp 120 or extends out of the base 121 of the clamp 120, the size of the part is extremely small. The operator can only hold the proximal end of the dilator 110 and the clamp 120 at the same time to realize the rotation of the entire dilator 100, which is extremely inconvenient to operate and still inconvenient to improve the smoothness of insertion.

[0047] For this, in the embodiment of the present application, along the circumference of the dilator 100, the proximal end of the dilator tube 110 is also engaged and positioned with the base 121. With such a layout, the dilator tube 110 and the base 121 are relatively fixed along the circumference of the dilator 100, that is, the two will not rotate relative to each other. During the insertion of the ureteral sheath, the entire dilator 100 can be rotated by rotating one of the clamp 120 or the dilator tube 110, so that the distal head of the dilator 100 (i.e., the distal end of the dilator tube 110) can be driven to rotate, and the relative displacement between the dilator 100 and the cavity wall is used to change the friction resistance from sliding friction to rolling friction, thereby alleviating the problem of insertion obstruction and improving the smoothness of the ureteral sheath insertion action.

[0048] It is usually more convenient to rotate the clip 120 because it is larger and easier for the operator to hold.

[0049] Note that, because the expansion tube 110 and the clamp 120 are positioned and matched along the circumference of the expander 100 , even if the proximal end of the expansion tube 110 is hidden in the base 121 of the clamp 120 , the entire expander 100 can still be rotated by rotating the clamp 120 .

[0050] There are many ways to achieve the positioning and clamping of the expansion tube 110 and the base 121 of the clamp 120 in the axial and circumferential directions of the expander 100, such as achieving positioning and matching through a concave and convex structure, and the embodiments of the present application do not make specific restrictions.

[0051] Exemplarily, the base 121 includes a positioning portion provided on the hole wall of the mounting hole 121a, and the extension direction of at least part of the positioning portion intersects with the axial direction of the mounting hole 121a, so as to realize the axial and circumferential clamping positioning of the proximal end of the expansion tube 110 at the same time. Among them, the positioning portion can be a positioning rib or a positioning groove. Under such a layout, the base 121 realizes the positioning and matching with the proximal end of the expansion tube 110 through the positioning portion, and the positioning effect has both the axial limiting effect of the expander 100 and the circumferential limiting effect of the expander 100. In this way, the positioning and matching effects in two directions are realized through the same positioning structure, thereby achieving the purpose of simplifying the structure.

[0052] For example, Figure 2 and Figure 6 As shown, the base 121 includes a first positioning rib 121b and a second positioning rib 121c arranged on the wall of the mounting hole 121a. The first positioning rib 121b is extended along the axial direction of the mounting hole 121a to achieve circumferential clamping positioning of the proximal end of the expansion tube 110, and the second positioning rib 121c is extended along the circumferential direction of the mounting hole 121a to achieve axial clamping positioning of the proximal end of the expansion tube 110.

[0053] In this example, the first positioning rib 121b and the second positioning rib 121c are used to achieve the positioning and matching effect. Figure 2 and Figure 3 As shown, the expansion tube 110 includes an adapter 112 disposed at its proximal end, and the adapter 112 has a first positioning groove 112a positioned to cooperate with the first positioning rib 121b, and a second positioning groove positioned to cooperate with the second positioning rib 121c.

[0054] Furthermore, if Figure 2 and Figure 6 As shown, the first positioning rib 121b is connected to the second positioning rib 121c, which can increase the overall strength of the first positioning rib 121b and the second positioning rib 121c and reduce the risk of damage to the clip 120 during use.

[0055] In another further embodiment, Figure 7 As shown, the second positioning rib 121 c is disposed at the distal end opening of the mounting hole 121 a , and the distal end surface of the second positioning rib 121 c is coplanar with the distal end surface of the base 121 .

[0056] It should be understood that, under such a layout, the second positioning rib 121c is less difficult to deform toward the distal end, because there is no hole wall of the base 121 on the distal end, and the deformation resistance is small. Therefore, this can facilitate the opposite insertion of the base 121 of the clip 120 and the proximal end of the expander 100, thereby improving the assembly efficiency. For details, see Figure 2 , Figure 2 The dotted arrows in the figure show the assembly directions of the two.

[0057] In addition, it is worth noting that the part of the second positioning rib 121c toward the proximal side is more difficult to deform because there is a hole wall of the base 121 on the proximal side, which has greater deformation resistance. Therefore, during the insertion process of the expander 100, the second positioning rib 121c can be reliably and stably used to prevent the expansion tube 110 from separating from the clamp 120.

[0058] In some embodiments of the present application, Figure 2 and Figure 3 As shown, the expansion tube 110 includes a first tube body 111 and an adapter 112, and the adapter 112 is fixedly installed at the distal end of the first tube body 111. The expansion tube 110 is connected to the base 121 through the adapter 112. It should be understood that the first tube body 111 is the main part of the expansion tube 110. In order to facilitate insertion into the human body cavity, the radial size of the first tube body 111 is relatively small, and it is not convenient to process the positioning structure that cooperates with the clip 120 thereon, thereby reducing the probability of damage. Accordingly, the size of the adapter 112 can be set to be a little larger to facilitate the processing of the positioning structure, thereby conveniently and reliably realizing the assembly of the expansion tube 110 and the clip 120.

[0059] In order to facilitate the assembly of the adapter 112 and the base 121 of the clip 120 , a guiding structure, such as a guiding slope, may be provided at the edge of the plug end of the adapter 112 .

[0060] See also Figure 1 to Figure 7 The embodiment of the present application provides a ureteral sheath, which includes a sheath tube 200 and the dilator 100 mentioned in any of the above schemes, so that the ureteral sheath has the beneficial effects of the dilator 100 mentioned above, which will not be repeated. Among them, the dilator tube 110 can be plugged into the sheath tube 200, and the clamp 120 can be connected to the proximal end of the sheath tube 200 through the clamping arm 122.

[0061] The specific connection method between the clamping arm 122 and the proximal end of the sheath tube 200 is not specifically limited in the embodiments of the present application.

[0062] For example, the clamping arm 122 is bent toward the distal end to form a hook, which is engaged with the step on the connecting seat 220 at the proximal end of the sheath tube 200 through the hook. Figure 3 to Figure 5 As shown, the clamping arm 122 is bent toward the distal end and inclined toward the central axis of the clamp 120. When the clamp 120 is matched with the connecting seat 220 at the proximal end of the sheath 200, the inclined clamping arm 122 can extend under the edge of the side wall of the connecting seat 220 to clamp in the axial direction.

[0063] Of course, the clamping connection of the embodiment of the present application can be directly connected to the tube body of the sheath tube 200, such as the proximal end of the second tube body 210 described later.

[0064] In some embodiments of the present application, Figure 3 to Figure 6 As shown, the sheath 200 includes a second tube body 210 and a connecting seat 220 fixedly installed at the proximal end of the second tube body 210, and the clamp 120 can be connected to the connecting seat 220 through a clamping arm 122; in the outer peripheral wall of the connecting seat 220 and the clamping arm 122, one is provided with a positioning protrusion 221, and the other is provided with a positioning recess 122a, and the positioning protrusion 221 can be clamped in the positioning recess 122a to position the clamp 120 and the connecting seat 220 in a circumferential direction. Figure 5 In the embodiment, the clamp 120 can rotate relative to the sheath 200 to realize the rotation of the dilator 100 relative to the sheath 200; Figure 6 In the embodiment, the clamp 120 and the connecting seat 220 are positioned and matched along the circumferential direction, and the dilator 100 and the sheath tube 200 are relatively fixed along the circumferential direction.

[0065] It should be understood that in some wider cavities, it is not necessary to rotate the dilator 100 to reduce the insertion resistance. At this time, the clamp 120 can be rotated to be positioned and matched with the connecting seat 220 along the circumferential direction, so that the dilator 100 and the sheath tube 200 are fixed along the circumferential direction. In this way, the connection between the two is more stable and will not move relative to each other, which is more convenient for the operator to apply force in the axial direction, avoid waste of force, and improve insertion efficiency. In addition, the positioning protrusion 221 can position the recess 122a to achieve axial clamping and matching, so as to strengthen the anti-slip ability between the dilator 100 and the sheath tube 200 in the axial direction.

[0066] In some embodiments of the present application, Figure 3 , Figure 4 and Figure 6 As shown, the positioning protrusion 221 is provided on the connecting seat 220, and the positioning recess 122a is provided on the clamping arm 122, so that the clamping arm 122 can be opened at a larger angle to clamp more tightly, thereby improving the axial anti-slip capability between the dilator 100 and the sheath tube 200.

[0067] Furthermore, if Figure 2 , Figure 3 and Figure 5 As shown, a guide groove 122b is provided on the clamping arm 122, and the guide groove 122b is extended along the circumference of the clamp 120, and the guide groove 122b corresponds to the positioning recess 122a, so that the positioning protrusion 221 slides into the positioning recess 122a through the guide groove 122b.

[0068] It should be understood that the guide groove 122b is actually a hollow structure, and the side wall of the positioning groove forms a channel for the positioning protrusion 221 to slide into, thereby avoiding the positioning protrusion 221 from being blocked by the side wall of the positioning recess 122a when it is inserted into the positioning recess 122a. It is worth mentioning that in the embodiment where the guide groove 122b does not exist, it is necessary to press the clamp 120 as a whole to make the clamping arm 122 radially outward, so that the positioning protrusion 221 can be smoothly inserted into the positioning recess 122a. In addition, when the clamp 120 is pressed to allow the positioning protrusion 221 to be inserted into the positioning recess 122a, the clamping arm 122 is radially outward, which also poses a risk of the dilator 100 and the sheath 200 being detached.

[0069] In this example, when the dilator 100 needs to be positioned relative to the sheath 200 in the circumferential direction, the relative rotation of the clamp 120 and the connecting seat 220 can be achieved by rotating the dilator 100 or the sheath 200 (usually the dilator 100), and there is no need to press the clamp 120, that is, on the premise of ensuring that the dilator 100 and the sheath 200 are axially engaged and will not disengage, the positioning protrusion 221 can slide into the positioning recess 122a along the guide groove 122b without hindrance. It can be seen that in this process, because the clamp 120 is not pressed, the axial relative position of the clamping arm 122 relative to the connecting seat 220 does not change, so there is no need to observe and align the positioning protrusion 221 and the positioning recess 122a, and blind insertion can be achieved. Furthermore, the sound of the positioning protrusion 221 sliding into the positioning recess 122a and the hand-feel feedback can be used to determine that the clamp is in place.

[0070] Furthermore, if Figure 2 As shown, the bottom surface of the guide groove 122b is the first guide surface 122c, and the first guide surface 122c is used to guide the positioning protrusion 221 to slide into the positioning recess 122a. The first guide surface 122c can be an inclined surface or an arc surface.

[0071] It should be understood that the first guide surface 122c can ensure that the guide groove 122b can achieve a guiding effect on the positioning protrusion 221. In addition, the first guide surface 122c can increase the side wall height of the positioning recess 122a close to the guide groove 122b, so that the positioning protrusion 221 can be more reliably connected to the positioning recess 122a, reducing the risk of accidental separation.

[0072] In some embodiments of the present application, Figure 3 , Figure 4 and Figure 7As shown, the sheath 200 includes a second tube body 210 and a connecting seat 220 fixedly installed at the proximal end of the second tube body 210, and the clamp 120 can be connected to the connecting seat 220 through a clamping arm 122; the inner wall of the connecting seat 220 is provided with a second guide surface 222, and the second guide surface 222 is used to guide the dilator 100 to slide into the second tube body 210, and the base 121 has an abutment surface 121d arranged at its proximal edge. When the clamp 120 is connected to the connecting seat 220, the base 121 abuts against the second guide surface 222 through the abutment surface 121d.

[0073] It should be understood that when the expander is connected to the connecting seat 220 of the sheath 200 through the clip 120, the connecting seat 220 is clamped by the clip 120 to achieve axial positioning and matching of the two. Usually, the connecting seat 220 is clamped between the clamping arm 122 and the base 121. In this example, the base 121 of the clip 120 has an abutment surface 121d, which can increase the contact area between the base 121 and the connecting seat 220, avoid stress concentration, and reduce the risk of damage to the clip 120 and the connecting seat 220. At the same time, the abutment surface 121d can improve the force stability between the base 121 and the connecting seat 220 and between the expander and the sheath 200, and avoid displacement or separation between the matching parts, especially in the process of the operator pushing the ureteral sheath along the axial direction.

[0074] In some embodiments of the present application, Figure 7 As shown, when the clamp 120 is connected to the connection seat 220, along the radial direction of the clamp 120, the portion where the clamp arm 122 clamps the outer peripheral wall of the connection seat 220 corresponds to the abutment surface 121d. Figure 7 The dashed line 1 in FIG. 1 shows a radial direction of the clip 120 .

[0075] It should be understood that the connection seat 220 is clamped between the clamping arm 122 and the base 121, and the force application locations of the two correspond in the radial direction of the clip 120, which can improve the clamping effect of the clip 120 on the connection seat 220 and strengthen the anti-slip capability.

[0076] The embodiment of the present application provides an endoscope assembly, including an endoscope and the ureteral sheath mentioned in any of the above solutions, so that the endoscope assembly has the beneficial effects of the above ureteral sheath, which will not be described in detail.

[0077] The endoscope referred to in the embodiments of the present application may be a bronchoscope, a pyeloscope, an esophagoscope, a gastroscope, a colonoscope, an otoscope, a rhinoscope, a stomatoscope, a laryngoscope, a colposcope, a laparoscope, an arthroscope, etc. The embodiments of the present application do not impose any specific restrictions on the type of endoscope.

[0078] The above embodiments of the present application focus on describing the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0079] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A dilator for a ureteral sheath, characterized in that: The dilator comprises a dilating tube and a clamp, wherein: The clip comprises a base and at least two clamping arms distributed along the circumference of the base, and the clip can be connected to the proximal end of the sheath tube of the ureteral sheath through the clamping arms; The base has a mounting hole, the proximal end of the expansion tube is inserted into the mounting hole, and in the axial direction and circumferential direction of the expander, the proximal end of the expansion tube is engaged and positioned with the base.

2. The dilator according to claim 1, characterized in that The base includes a first positioning rib and a second positioning rib provided on the wall of the mounting hole, wherein the first positioning rib is provided to extend along the axial direction of the mounting hole to realize circumferential clamping and positioning of the proximal end of the expansion tube, and the second positioning rib is provided to extend along the circumferential direction of the mounting hole to realize axial clamping and positioning of the proximal end of the expansion tube; Wherein: the first positioning rib is connected to the second positioning rib; and / or the second positioning rib is arranged at the distal opening of the mounting hole, and the distal surface of the second positioning rib is coplanar with the distal surface of the base.

3. The dilator according to claim 1, characterized in that The base includes a positioning portion provided on the wall of the mounting hole, and at least a portion of the extending direction of the positioning portion intersects with the axial direction of the mounting hole, so as to realize the clamping positioning of the proximal end of the expansion tube in the axial direction and the circumferential direction at the same time; And / or, the expansion tube includes a first tube body and an adapter, the adapter is fixedly mounted on the distal end of the first tube body, and the expansion tube is connected to the base via the adapter.

4. A ureteral sheath, characterized in that: It comprises a sheath tube and the dilator according to any one of claims 1 to 3, wherein the dilator tube can be inserted and fitted into the sheath tube, and the clamp can be connected to the proximal end of the sheath tube through the clamping arm.

5. The ureteral sheath according to claim 4, characterized in that: The sheath tube includes a second tube body and a connecting seat fixedly installed at the proximal end of the second tube body, and the clamp can be connected to the connecting seat through the clamping arm; in the outer peripheral wall of the connecting seat and the clamping arm, one is provided with a positioning protrusion and the other is provided with a positioning recess, and the positioning protrusion can be clamped in the positioning recess to position the clamp and the connecting seat in a circumferential direction.

6. The ureteral sheath according to claim 5, characterized in that: The positioning protrusion is arranged on the connecting seat, and the positioning recess is arranged on the clamping arm; a guide groove is arranged on the clamping arm, and the guide groove is extended along the circumference of the clamp, and the guide groove corresponds to the positioning recess, so that the positioning protrusion slides into the positioning recess through the guide groove.

7. The ureteral sheath according to claim 6, characterized in that: The bottom surface of the guide groove is a first guiding surface, and the first guiding surface is used to guide the positioning protrusion to slide into the positioning recess.

8. The ureteral sheath according to claim 4, characterized in that: The sheath includes a second tube body and a connecting seat fixedly installed at the proximal end of the second tube body, and the clamp can be connected to the connecting seat through the clamping arm; the inner wall of the connecting seat is provided with a second guide surface, and the second guide surface is used to guide the dilator to slide into the second tube body, and the base has an abutment surface provided on its proximal edge, and when the clamp is connected to the connecting seat, the base abuts against the second guide surface through the abutment surface.

9. The ureteral sheath according to claim 8, characterized in that: When the clamp is connected to the connection seat, along the radial direction of the clamp, the portion where the clamp arm clamps the outer peripheral wall of the connection seat is arranged corresponding to the abutment surface.

10. An endoscope assembly, characterized in that: The invention comprises an endoscope and the ureteral sheath according to any one of claims 4 to 9, wherein the insertion portion of the endoscope can be plugged into and fitted into the sheath tube.

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