Auxiliary short sheath of whole-flow flexible ureteroscope

Abstract

The invention provides an auxiliary short sheath of a whole-flow flexible ureteroscope, which is used for being arranged at the front end of the flexible ureteroscope, and comprises a sheath tube which extends for a preset length along the axial direction; the first through hole penetrates through the sheathing canal in the axial direction and is used for being connected to the flexible ureteroscope in a sleeving mode; the second through hole penetrates through the sheath tube in the axial direction and is located on one side of the first through hole, and the second through hole at least has a guide wire penetrating state and a stent placing state; in a guide wire penetrating state, the second through hole is used for allowing a ureter guide wire to penetrate through, so that the ureter guide wire is placed under direct vision of a flexible ureteroscope located in the first through hole; and in a stent placement state, the second through hole is used for allowing a ureter stent tube to pass through, so that the ureter stent tube is placed under the direct view of the flexible ureteroscope in the first through hole. The problems that the ureter guide wire is easy to damage due to the fact that the ureter guide wire is placed through a working channel of the flexible ureteroscope, the ureter guide wire is difficult to enter a ureter, and a ureter support tube cannot be placed are solved.

Description

Technical Field

[0001] The present application relates to the technical field of urinary system surgical instruments, and more specifically, to an auxiliary short sheath for a full-process ureteroscope. Background Art

[0002] Urinary stones are common diseases of the urinary system, with an overall incidence of 1%-5%, and as high as 5%-10% in some areas. In the surgery of upper ureteral stones and kidney stones, it is usually recommended to use a flexible ureteroscope for stone treatment. For upper urinary tract stones >2cm, staged surgery has good results, with the characteristics of less trauma, faster recovery, and shorter hospitalization time. It has been widely developed and used in clinical applications. At present, the operation process of ureteroscopic lithotripsy requires repeated replacement of ureteroscopes and flexible ureteroscopes, which makes the operation cumbersome and inconvenient. In addition, during the process of postoperative retention of ureteral stents, ureteroscopes and flexible ureteroscopes also need to be repeatedly replaced, resulting in different mirrors repeatedly entering and exiting the urethra, which can easily damage the ureteral guidewire and the urethral mucosa. There is also a direct placement of the guidewire through the flexible ureteroscope, which can avoid the repeated replacement of the ureteroscope and the flexible ureteroscope. Therefore, during urinary system surgery, the ureteroscope is usually first advanced into the bladder under the guidance of the lens to find the ureteral opening, a ureteral guidewire is placed into the ureter using the working channel of the ureteroscope, the ureteroscope is then withdrawn, a ureteral sheath is placed along the guidewire, the guidewire is then pulled out, and the ureteroscope is passed through the ureteral sheath into the corresponding position of the ureter to find the stone and perform the surgery.

[0003] At present, the working channel of the ureteroscope has a small scope of use. It can only assist the ureteroscope in placing a ureteral guidewire, and cannot place a ureteral stent through the working channel of the ureteroscope. In addition, due to the small inner diameter of the working channel of the ureteroscope, it is easy to damage the clear water layer on the surface of the ureteral guidewire during the placement of the ureteral guidewire, which can easily cause the ureteral guidewire to wear and cause inconvenience in use. The working channel of the ureteroscope itself cannot be observed directly, and there are great difficulties in the process of placing the guidewire. In particular, it is more difficult to place a ureteral guidewire in elderly male patients with prostatic hyperplasia, and it is impossible to effectively treat lower ureteral stones.

[0004] Therefore, the prior art still needs to be improved and developed. Summary of the invention

[0005] The purpose of the present application is to provide an auxiliary short sheath for a full-process ureteroscope, which solves the problems in the prior art of placing a ureteral guidewire through the working channel of a ureteroscope, which easily leads to damage of the ureteral guidewire, great difficulty in inserting the ureteral guidewire into the ureter, and inability to place a ureteral stent.

[0006] To achieve the above purpose, the technical solution adopted in this application is:

[0007] On the one hand, the present application provides an auxiliary short sheath of a full-process ureteroscope, which is used to be arranged at the front end of the ureteroscope, wherein the auxiliary short sheath comprises: a sheath tube, which extends axially to a predetermined length;

[0008] A first through hole, the first through hole axially passes through the sheath tube and is used for sleeve connection on the ureteroscope;

[0009] A second through hole, the second through hole axially passes through the sheath tube and is located on one side of the first through hole, and the second through hole has at least a guide wire passing state and a stent placement state;

[0010] Wherein, in the guidewire insertion state, the second through hole is used to pass the ureteral guidewire, so as to place the ureteral guidewire under the direct vision of the ureteroscope located in the first through hole;

[0011] In the stent placement state, the second through hole is used to pass the ureteral stent tube so as to place the ureteral stent tube under the direct vision of the ureteroscope in the first through hole.

[0012] Optionally, the sheath has a first end and a second end which are arranged axially and opposite to each other, and the second end of the sheath is used for detachably connecting with the ureteroscope.

[0013] Optionally, the front end of the ureteroscope located in the first through hole does not protrude from the end surface of the first end of the sheath.

[0014] Optionally, a breach is formed at the first end of the sheath tube, and the breach makes the opening of the first end of the second through hole arc-shaped.

[0015] Optionally, the sheath is a transparent cylindrical tube.

[0016] Optionally, the second end of the first through hole is provided with an internal thread, and the sheath is threadedly connected to the ureteroscope via the internal thread.

[0017] Optionally, a rotation locking assembly is provided at the second end of the sheath, and the rotation locking assembly locks the ureteroscope in the first through hole or releases the ureteroscope in the first through hole by rotating.

[0018] Optionally, the rotary locking assembly comprises: a rotary ring, the rotary ring is sleeved on the sheath tube, and a wedge block is arranged on the inner wall of the rotary ring;

[0019] A locking block, which is movably arranged in the inner wall of the sheath tube, and one end of the locking block abuts against the wedge block;

[0020] An elastic return member connected to the locking block and used to apply elastic force to make the locking block abut against the wedge block;

[0021] An elastic locking piece is arranged in the inner wall of the sheath tube and is used to lock the rotation position of the rotating ring.

[0022] Optionally, an inner card slot is provided on the inner wall of the rotating ring;

[0023] The elastic locking member comprises a locking tooth block and a locking spring, and the locking tooth block is inserted into the inner locking groove by the elastic force of the locking spring.

[0024] Optionally, the diameter of the second through hole is smaller than the diameter of the first through hole.

[0025] The beneficial effect of the auxiliary short sheath of a full-process ureteroscope provided by the present application is at least that: the auxiliary short sheath is installed on the ureteroscope through the first through hole, so that the ureteroscope can be used as a hard ureteroscope. The ureteroscope with the auxiliary short sheath can be inserted into the bladder under the guidance of the lens and the ureteral opening can be found. When the ureteral guidewire needs to be placed, the ureteral guidewire is passed through the second through hole and the ureteral guidewire is placed in the ureter under the direct vision of the ureteroscope located in the first through hole. Since the ureteral guidewire is transported through a separate second through hole, it is not easy to damage the clear water layer on the surface of the ureteral guidewire during the placement of the ureteral guidewire, thereby ensuring the stability of the ureteral guidewire implantation. When a ureteral stent needs to be placed, the second through hole is used to pass the ureteral stent through, so that the ureteral stent is placed in the ureter under the direct vision of the ureteroscope located in the first through hole, and the ureteral stent is delivered through the separate second through hole, reducing the collision damage of the ureteral stent. In addition, during the implantation of the ureteral guidewire or ureteral stent, the ureteroscope located in the first through hole can be used for direct observation, and the ureteral guidewire or ureteral stent placement process allows the doctor to clearly see the urethral wall, so that it is not easy to cause damage to the urethral mucosa during the placement of the ureteral guidewire or ureteral stent, making it easier for the ureteral guidewire to enter the ureter. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 A schematic diagram of the structure of a full-process flexible ureteroscope provided in an embodiment of the present application after being connected to a flexible ureteroscope;

[0028] Figure 2 A schematic diagram of a structure of an auxiliary short sheath of a full-process ureteroscope provided in an embodiment of the present application;

[0029] Figure 3 A schematic structural diagram of the front end portion of an auxiliary short sheath of a full-process ureteroscope provided in an embodiment of the present application;

[0030] Figure 4 A schematic diagram of the structure of a second structure of an auxiliary short sheath of a full-process flexible ureteroscope connected to a flexible ureteroscope provided in an embodiment of the present application;

[0031] Figure 5 A schematic diagram of the internal structure of a second structure of an auxiliary short sheath of a full-process ureteroscope provided in an embodiment of the present application;

[0032] Figure 6 A cross-sectional view of a second structure of an auxiliary short sheath of a full-process ureteroscope provided in an embodiment of the present application;

[0033] Figure 7 An exploded view of the second structure of an auxiliary short sheath of a full-process ureteroscope provided in an embodiment of the present application.

[0034] Among them, the reference numerals in the figure are:

[0035] 10. Auxiliary short sheath; 100. Sheath tube; 110. Break; 120. Avoidance; 130. Spring installation groove; 140. Outer ring groove; 200. First through hole; 210. Internal thread; 300. Second through hole; 400. Rotary locking assembly; 410. Rotating ring; 411. Internal slot; 420. Wedge block; 421. Extrusion surface; 422. Unlocking end; 423. Locking end; 430. Locking block; 431. Blocking surface; 440. Elastic return member; 450. Elastic locking member; 451. Tooth block; 452. Locking spring; 20. Ureteroscope; 21. Locking slot. DETAILED DESCRIPTION

[0036] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0037] It should be noted that the leading line with an arrow in the annotation indicates a non-physical area such as a hole or slot, or a non-specific physical feature such as a superordinate feature, or a specific direction. The leading line without an arrow in the annotation indicates a physical feature or a specific subordinate specific feature.

[0038] When a component is referred to as being "fixed to" or "disposed on" another component, it may be directly or indirectly located on the other component. When a component is referred to as being "connected to" another component, it may be directly or indirectly connected to the other component. The directions or positions indicated by the terms "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the directions or positions shown in the accompanying drawings and are only for the convenience of description and are not to be construed as limitations on the present technical solution. The terms "first" and "second" are only used for the convenience of description and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0039] like Figure 1 , Figure 2 , Figure 3 As shown, this embodiment proposes an auxiliary short sheath for a full-process ureteroscope. The auxiliary short sheath 10 is used to be arranged at the front end of the ureteroscope 20. When in use, the auxiliary short sheath 10 is installed on the ureteroscope 20, and is used together with the ureteroscope 20 to achieve the advantages of a rigid ureteroscope. For the convenience of structural description, the end of the ureteroscope 20 used to be inserted into the patient's body is the front end, and the end used by medical staff to operate outside the human body is the rear end. When describing the structure in this embodiment, the front end is the first end and the rear end is the second end.

[0040] like Figure 1 , Figure 2 , Figure 3 As shown, the auxiliary short sheath 10 of this embodiment mainly includes: a sheath tube 100, a first through hole 200 and a second through hole 300. The sheath tube 100 can be cylindrical and extend a predetermined length in the axial direction, with its axial front end being the first end and its axial rear end being the second end. The first through hole 200 runs through the sheath tube 100 in the axial direction and is used to be sleeved and connected to the ureteroscope 20. In order to adapt to the ureteroscope 20, the first through hole 200 is a circular hole. The second through hole 300 runs through the sheath tube 100 in the axial direction and is located on one side of the first through hole 200, for example, the second through hole 300 is located below the first through hole 200. The second through hole 300 can be a circular hole or a waist-shaped hole, etc. According to different functions of the second through hole 300, the second through hole 300 has at least a guide wire insertion state and a stent placement state; in the guide wire insertion state, the second through hole 300 is used to pass the ureteral guide wire to place the ureteral guide wire under the direct vision of the ureteroscope 20 located in the first through hole 200. In the stent placement state, the second through hole 300 is used to pass the ureteral stent tube (DJ tube) to place the ureteral stent tube (DJ tube) under the direct vision of the ureteroscope 20 in the first through hole 200.

[0041] like Figure 1 , Figure 2 As shown, the present application provides an auxiliary short sheath for a full-process ureteroscope. The auxiliary short sheath 10 is installed on the ureteroscope 20 through the first through hole 200, so that the ureteroscope 20 can be used as a hard ureteroscope. The ureteroscope 20 with the auxiliary short sheath 10 can be inserted into the bladder under the guidance of the lens and the ureteral opening can be found. When the ureteral guidewire needs to be placed, the ureteral guidewire is passed through the second through hole 300, so that the ureteral guidewire is placed in the ureter under the direct vision of the ureteroscope 20 located in the first through hole 200. Since the ureteral guidewire is transported through the separate second through hole 300, it is not easy to damage the clear water layer on the surface of the ureteral guidewire during the placement of the ureteral guidewire, thereby ensuring the stability of the ureteral guidewire implantation. When a ureteral stent needs to be placed, the second through hole 300 is used to pass the ureteral stent, so that the ureteral stent is placed in the ureter under the direct vision of the ureteroscope 20 located in the first through hole 200, and the ureteral stent is delivered through the separate second through hole 300, reducing the collision damage of the ureteral stent. In addition, during the implantation of the ureteral guide wire or ureteral stent, the ureteroscope 20 located in the first through hole 200 can be used for direct observation, and the ureteral wall can be clearly seen during the placement of the ureteral guide wire or ureteral stent, so that the urethral mucosa is not easily damaged during the placement of the ureteral guide wire or ureteral stent. Furthermore, due to the structural reinforcement effect of the auxiliary short sheath, the front end of the ureteroscope 20 forms a hard structure under the protection of the auxiliary short sheath, so that it can be used as a ureteroscope. Therefore, the ureteroscope with an auxiliary short sheath at the front end can be used as a hard endoscope, so that it can be inserted into the lower ureter and effectively treat stones in the lower ureter.

[0042] like Figure 1 , Figure 2 , Figure 3As shown, further, the front end of the flexible ureteroscope 20 located in the first through hole 200 of the sheath 100 of this embodiment does not protrude from the end surface of the first end of the sheath 100. By reinforcing the structure of the front end of the flexible ureteroscope 20 by the sheath 100, the sheath 100 itself has good structural strength and will not bend during the insertion process, so that the flexible ureteroscope 20 can be used as a hard scope and is easy to insert. In the specific structure, after the ureteroscope 20 is installed in the first through hole 200, the front end surface of the ureteroscope 20 is located in the front end opening of the first through hole 200, and does not exceed the front end surface of the sheath 100, so that the front end surface of the sheath 100 has a protective effect on the ureteroscope 20. When the ureteroscope 20 is inserted, the front end is actually the front end of the sheath 100, thereby ensuring that the front end of the ureteroscope 20 is not deformed during the insertion into the urethra, which is equivalent to the insertion effect of the ureteroscope, and ensures the smoothness and stability of the insertion process of the ureteroscope 20 during the insertion into the bladder or even the ureter. After the ureteroscope 20 of this embodiment is installed in the first through hole 200, the front end of the ureteroscope 20 can be flush with the front end surface of the sheath 100, thereby avoiding blocking the line of sight of the ureteroscope 20 and improving the stability of the lens shooting picture.

[0043] like Figure 1 , Figure 2 , Figure 3As shown, further, the first end of the sheath tube 100 of this embodiment is provided with a breach 110, and the breach 110 makes the opening of the first end of the second through hole 300 arc-shaped. For the convenience of structural description, the structure is described by taking the first through hole 200 being arranged at the upper part of the end face of the sheath tube 100 and the second through hole 300 being arranged at the lower part of the end face of the sheath tube 100 as an example. The breach 110 is arranged at the lower part of the end face of the sheath tube 100 in the upper semicircular area of ​​the end face of the sheath tube 100 where the first through hole 200 at the upper part is located, so that the lower semicircular area of ​​the end face is cut off, and the breach 110 extends toward the rear side of the sheath tube 100 and gradually transitions toward the lower outer wall of the sheath tube 100. In this way, the outer contour of the front end face of the sheath tube 100 is an arched contour with half of the second through hole 300 at the bottom, so as to match the outer contour of the cross section of the human ureter. When it is necessary to treat the calculi in the ureter, the sheath tube 100 can be directly inserted into the ureter with the ureteroscope 20 for surgery. Therefore, by setting the outer contour of the front end of the sheath tube 100, an auxiliary short sheath of the full-process ureteroscope is formed. By using the first through hole 200 and the second through hole 300 as dual working channels, the apertures of the first through hole 200 and the second through hole 300 can be the same; or, the aperture of the second through hole is smaller than the aperture of the first through hole; in the specific structure, the two apertures of this embodiment are different, and the aperture of the second through hole will be smaller. Such a design allows the auxiliary short sheath to enter the lower section of the ureter. In the specific structure, the aperture of the first through hole is about 2.5 mm, and the aperture of the second through hole is about 2 mm.

[0044] The upper first through hole 200 is used as the working channel of the soft endoscope, and the lower second through hole 300 is used as the use channel for placing the ureteral guidewire and ureteral stent. This can improve the previous situation that only the ureteral guidewire can be placed through the ureteral soft endoscope 20, but the ureteral stent cannot be placed. At the same time, it can reduce the repeated replacement of different ureteroscope bodies and the entry and exit of the urethra, reduce the cumbersome work steps and the damage to the urethral mucosa, and more accurately place the ureteral guidewire and ureteral stent.

[0045] Furthermore, the sheath tube 100 of the present embodiment is a transparent cylindrical tube. In the specific structure, the sheath tube 100 is made of a visible material, such as a transparent hard material plastic, and the sheath tube 100 with a length of about 40cm-60cm and a first through hole 200 and a second through hole 300 is made of transparent hard plastic. In this way, the sheath tube 100 is used to strengthen the structure at the front end of the ureteroscope 20, and the sheath tube 100 itself has a good structural strength and will not bend during the insertion process, so that the ureteroscope 20 can be used as a hard mirror and is easy to insert. The use of transparent material makes it easy to observe the position of entering the sheath tube 100 when the ureteroscope 20 is inserted, and it is convenient to insert the ureteroscope 20 into the first through hole 200 for installation. In addition, the transparent cylindrical tube can also make it easier for the lens of the ureteroscope 20 to be directly viewed, and it will be easier to place the ureteral guide wire and ureteral stent tube under the direct view of the lens, which can increase visibility.

[0046] like Figure 2 , Figure 4 As shown, further, the second end of the sheath tube 100 of this embodiment is used for detachably connecting the ureteroscope 20. By providing a detachable structure at the second end (rear end) of the sheath tube 100, it is convenient to install the auxiliary short sheath 10 on the ureteroscope 20. The diameters of the first through hole 200 and the second through hole 300 of this embodiment can both be 4 mm, and the overall length can be about 40 cm. The ureteroscope 20 is connected through the detachable structure at the rear end, so that the position of the ureteroscope 20 and the sheath tube 100 can be fixed, thereby reducing movement and making the use of the ureteroscope 20 more convenient.

[0047] The second end (rear end) of the sheath tube 100 may be provided with a detachable structure in various forms, as follows:

[0048] like Figure 1 , Figure 2 As shown, in the first form of the detachable structure, an internal thread 210 is provided at the second end of the first through hole 200, and the sheath 100 is screwed with the ureteroscope 20 through the internal thread 210. The connection between the ureteroscope 20 and the sheath 100 is achieved through threaded connection, which can achieve stable fixation, and is easy to manufacture and use. In the specific structure, an external thread is provided on the outer wall of the ureteroscope 20, and the ureteroscope 20 is inserted into the first through hole 200, and then the sheath 100 is twisted to make the internal thread 210 butt with the external thread.

[0049] like Figure 4 , Figure 5 , Figure 6As shown, in the second form of the detachable structure, the second end of the sheath tube 100 is provided with a rotating locking assembly 400, and the rotating locking assembly 400 locks the ureteroscope 20 located in the first through hole 200 or releases the ureteroscope 20 located in the first through hole 200 by rotation. A locking groove 21 is provided on the outer wall of the ureteroscope 20, and the ureteroscope 20 is fixedly connected by the rotating locking assembly 400 being embedded in the locking groove 21, and the sheath tube 100 and the ureteroscope 20 are separated by the rotating locking assembly 400 from the locking groove 21. In this way, only a locking groove 21 needs to be provided on the outer wall of the ureteroscope 20, and no other protruding structure needs to be provided, so that the outer wall of the ureteroscope 20 is relatively smooth and more convenient to use. In addition, the outer wall of the rotary locking assembly 400 can be embedded in the outer wall of the sheath tube 100 and does not protrude from the outer wall of the sheath tube 100, so that the problem of unsmooth insertion is not likely to occur during the insertion into the urethra.

[0050] like Figure 4 , Figure 6 , Figure 7As shown, the rotary locking assembly 400 of this embodiment specifically includes: a rotary ring 410, a locking block 430, an elastic return member 440 and an elastic locking member 450. The rotary ring 410 is sleeved on the sheath tube 100, a wedge block 420 is arranged on the inner wall of the rotary ring 410, the locking block 430 is movably arranged in the inner wall of the sheath tube 100, one end of the locking block 430 abuts against the wedge block 420, the elastic return member 440 is connected to the locking block 430 and is used to apply elastic force to make the locking block 430 abut against the wedge block 420, and the elastic locking member 450 is arranged in the inner wall of the sheath tube 100 and is used to lock the rotation position of the rotary ring 410. In the specific process, the wedge block 420 is driven to rotate by the rotation of the rotating ring 410. The wedge block 420 has an extrusion surface 421 facing inward, which is an arc surface, and the extrusion surface 421 along the rotation direction gradually approaches the rotation center (the axis of the sheath tube 100), with the end of the extrusion surface 421 farther from the rotation center as the unlocking end 422, and the end of the extrusion surface 421 closer to the rotation center as the locking end 423. An air-avoiding opening 120 is provided in the area between the first through hole 200 and the second through hole 300 in the sheath tube 100, and a mounting hole is provided along the radial direction of the sheath tube 100 or parallel to the radial direction of the sheath tube 100, and the mounting hole connects the first through hole 200 and the air-avoiding opening 120. The locking block 430 is movably arranged in the mounting hole and can move along the extension direction of the mounting hole. The outward end of the locking block 430 abuts against the extrusion surface 421 of the wedge block 420, and the inward end has a blocking surface 431. Therefore, by rotating the wedge block 420, the outer end of the lock block 430 abuts against different areas of the extrusion surface 421. When the outer end of the lock block 430 abuts against the unlocking end 422, the blocking surface 431 is located on the inner wall of the first through hole 200 and blocks the mounting hole. When the rotating ring 410 rotates, the unlocking end 422 gradually rotates toward the outer end of the lock block 430, thereby squeezing the lock block 430 and pushing the lock block 430 toward the first through hole 200, so that the blocking surface 431 is squeezed into the first through hole 200, so that it can be stuck in the locking groove 21 opened on the outer wall of the ureteroscope 20, so that the ureteroscope 20 is locked with the sheath 100 in the axial direction. A spring installation groove 130 is opened on the inner wall of the sheath 100, and the elastic return member 440 is a spring, one end of which is connected to the lock block 430 and the other end is fixed in the spring installation groove 130. The elastic return member 440 applies an outward elastic force to the lock block 430, so that the lock block 430 can always abut against the extrusion surface 421 of the wedge block 420. When the lock block 430 abuts against the unlocking end 422, the elastic locking member 450 needs to lock and maintain the current state, thereby realizing the locking function.If unlocking is required, the rotating ring 410 is twisted in the opposite direction. At this time, the twisting force applied must be greater than the locking force of the elastic locking member 450 to complete the unlocking and release the rotating ring 410. After the rotating ring 410 is moved, the locking block 430 pushes the wedge block 420 under the drive of the elastic return member 440, thereby driving the rotating ring 410 to return.

[0051] like Figure 4 , Figure 6 , Figure 7 As shown, an inner groove 411 is provided on the inner wall of the rotating ring 410. The elastic locking member 450 of this embodiment specifically comprises: a locking tooth block 451 and a locking spring 452, and the locking tooth block 451 is inserted into the inner groove 411 by the elastic force of the locking spring 452. The locking spring 452 is used to apply a radially outward elastic force, so that the locking tooth block 451 can be stuck in the inner groove 411 under the action of the elastic force, and the elastic force applied by the elastic return member 440 is small, so that the elastic force of the locking spring 452 will not be overcome by its own elastic force to squeeze the locking tooth block 451.

[0052] like Figure 4 , Figure 7 As shown, the outer wall of the sheath tube 100 of this embodiment is provided with an outer ring groove 140, and the outer ring groove 140 is used to install the rotating ring 410, so that the rotating ring 410 does not protrude from the outer ring groove 140. To facilitate twisting, a plurality of anti-slip grooves are provided on the rotating ring 410, so as to facilitate manual twisting.

[0053] In summary, the auxiliary short sheath of a full-process ureteroscope proposed in the present application, by setting two working channels on the sheath 100, allows the first through hole 200 for the ureteroscope 20 to penetrate, which can facilitate operation under direct vision. The second through hole 300 is the working channel for the ureteral stent tube or the ureteral guidewire to enter. At the same time, the material of the sheath 100 is transparent, and the damage to the urethra is reduced by increasing the perspective, and the ureteral guidewire is placed more easily under direct vision. The diameter of the second through hole 300 is larger than the diameter of the working channel of the soft mirror, thereby reducing the collision in the working channel where the ureteral stent tube and the guidewire enter, and it is also easier to place the ureteral guidewire and the ureteral stent tube under direct vision, thereby reducing the repeated replacement of different mirror bodies and the operation of entering the urethra, which can improve the efficiency and safety of surgical operations.

[0054] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An auxiliary short sheath for a full-process ureteroscope, used to be arranged at the front end of a ureteroscope, characterized in that: The auxiliary short sheath comprises: a sheath tube, the sheath tube extending axially by a predetermined length; A first through hole, wherein the first through hole penetrates the sheath tube along the axial direction and is used for being sleeved and connected to the ureteroscope; A second through hole, the second through hole axially passes through the sheath tube and is located on one side of the first through hole, the second through hole having at least a guidewire insertion state and a stent placement state; Wherein, in the guidewire insertion state, the second through hole is used to pass the ureteral guidewire, so as to place the ureteral guidewire under the direct vision of the ureteroscope located in the first through hole; In the stent placement state, the second through hole is used to pass the ureteral stent tube so as to place the ureteral stent tube under direct vision of the ureteroscope in the first through hole.

2. The auxiliary short sheath of the full-process ureteroscope according to claim 1, characterized in that: The sheath tube has a first end and a second end which are arranged opposite to each other along the axial direction, and the second end of the sheath tube is used for detachably connecting with the ureteroscope.

3. The auxiliary short sheath of the full-process ureteroscope as claimed in claim 2, characterized in that: The front end of the ureteroscope located in the first through hole does not protrude from the end surface of the first end of the sheath tube.

4. The auxiliary short sheath of the full-process ureteroscope as claimed in claim 3, characterized in that: The first end of the sheath tube is provided with a breach, and the breach makes the opening of the first end of the second through hole arc-shaped.

5. The auxiliary short sheath of the full-process ureteroscope as claimed in claim 2, characterized in that: The sheath tube is a transparent cylindrical tube.

6. The auxiliary short sheath of the full-process ureteroscope according to claim 2, characterized in that: The second end of the first through hole is provided with an internal thread, and the sheath is threadedly connected to the ureteroscope via the internal thread.

7. The auxiliary short sheath of the full-process ureteroscope as claimed in claim 2, characterized in that: The second end of the sheath is provided with a rotation locking assembly, and the rotation locking assembly locks the ureteroscope in the first through hole or releases the ureteroscope in the first through hole by rotating.

8. The auxiliary short sheath of the full-process ureteroscope according to claim 7, characterized in that: The rotary locking assembly comprises: a rotary ring, the rotary ring is sleeved on the sheath tube, and a wedge block is arranged on the inner wall of the rotary ring; A locking block, the locking block being movably disposed in the inner wall of the sheath tube, one end of the locking block being in contact with the wedge block; an elastic return member, the elastic return member being connected to the locking block and used for applying elastic force to make the locking block abut against the wedge block; An elastic locking piece is arranged in the inner wall of the sheath tube and is used to lock the rotation position of the rotating ring.

9. The auxiliary short sheath of the full-process ureteroscope according to claim 8, characterized in that: An inner groove is provided on the inner wall of the rotating ring; The elastic locking member comprises a locking tooth block and a locking spring, and the locking tooth block is inserted into the inner locking groove by the elastic force of the locking spring.

10. The auxiliary short sheath of the full-process flexible ureteroscope according to any one of claims 1 to 9, characterized in that: The aperture of the second through hole is smaller than the aperture of the first through hole.

Images