Flexible ureteroscope sheath kit

Abstract

The invention discloses a flexible ureteroscope sheath suite which is used for a flexible ureteroscope, and the flexible ureteroscope sheath suite is used for inserting a hard ureteroscope tube into an equipment channel, and fixing a sheath core connecting piece and an outer sheath connecting piece; the flexible endoscope body is inserted into the endoscope body channel, and the sheath core fixing piece is fixed to the front end of a handle of the flexible ureteroscope; placing the flexible ureteroscope sheath kit and a hard ureteroscope assembled by the flexible ureteroscope into the ureter; and the sheath core connecting piece and the outer sheath connecting piece are disconnected, and the sheath core and the flexible ureteroscope are withdrawn. The one-step sheath placement can be realized, the operation efficiency is greatly improved, the function of actively expanding the ureter is achieved, the sheath placement resistance is reduced, the sheath placement success rate is further improved, the soft and hard combined sheath is utilized, the tube cavity cannot deform after being extruded, the soft lens can coaxially rotate in the sheath tube cavity, and the target position can be more easily and accurately found.

Description

Technical Field

[0001] This invention relates to a flexible ureteroscope sheath kit. Background Technology

[0002] Flexible ureteroscopic lithotripsy (FURL) is an important minimally invasive technique in the field of urology for the treatment of upper urinary tract stones in recent years. This technique utilizes the body's natural cavities, inserting a flexible ureteroscope through the urethra and bladder to directly visualize the renal collecting system, locate the stones, and use energy platforms such as lasers to break them up.

[0003] Its technical principle mainly relies on the active bending function of the flexible endoscope. This design allows the surgeon to explore the renal pelvis and most renal calyces, which are inaccessible by traditional rigid endoscopes. It is particularly suitable for treating lower pole kidney stones and some complex kidney stones. During the lithotripsy process, holmium laser or thulium fiber laser transmits energy through optical fiber, pulverizing the stone into extremely fine powder particles (usually less than 2 mm in diameter) in a liquid environment. These particles can be naturally excreted with urine.

[0004] Compared to traditional treatments, FURL demonstrates significant clinical advantages: First, it is minimally invasive, operating entirely through natural cavities, avoiding the lumbar puncture trauma required for percutaneous nephrolithotomy (PCNL), resulting in a low risk of bleeding and rapid postoperative recovery; Second, the lithotripsy effect is precise and controllable, making up for the limitations of extracorporeal shock wave lithotripsy (ESWL) in pulverizing hard stones and the uncontrollable stone fragments.

[0005] Current techniques employ a step-by-step sheath placement method, which involves first placing a guidewire under rigid ureteroscopy, then withdrawing the rigid ureteroscope, blindly inserting a ureteral sheath and sheath core along the guidewire, removing the sheath core, and then inserting a flexible ureteroscope through the outer sheath channel. This method has low surgical efficiency, low success rate of sheath placement, and is prone to complications.

[0006] Moreover, ureteroscopic lithotripsy is difficult to locate and break up stones, has significant limitations in operation, and has low surgical efficiency. Summary of the Invention

[0007] The technical problem this invention aims to solve is to overcome the shortcomings of existing ureteroscopic lithotripsy techniques, such as low surgical efficiency, low success rate of sheath placement, easy occurrence of complications, difficulty in locating and fragmenting stones, and significant operational limitations. This invention provides an integrated design of the endoscope and endoscope sheath, enabling one-step visualized sheath placement, significantly improving surgical efficiency, reducing complications, actively dilating the ureter, reducing sheath placement resistance, further improving the success rate of sheath placement, and ensuring that the kidney, ureter, bladder, and urethra are in a horizontal position. The flexible endoscope can rotate coaxially within the sheath lumen, thereby improving surgical efficiency.

[0008] Modern ureteroscopes are relatively soft, especially in male surgeries. Due to the physiological curvature of the male urethra, the sheath also curves upwards during the procedure. When performing negative suction lithotripsy, the fragments are prone to backflow at this point, affecting the negative suction effect. At the same time, the softness of the sheath causes the lumen to deform when compressed by the surrounding tissues, making it impossible for the flexible ureteroscope to rotate coaxially within the sheath lumen, which affects the ability of the flexible endoscope tip to locate stones and fragments within the renal calyces.

[0009] The present invention solves the above-mentioned technical problems through the following technical solution:

[0010] A flexible ureteroscope sheath kit for use with a flexible ureteroscope, characterized in that the flexible ureteroscope sheath kit includes an outer sheath and a sheath core. The outer sheath includes a sheath body and an outer sheath base. The inner side of the sheath body has a device channel. The sheath core includes a rigid endoscope tube and a connecting tube. The rigid endoscope tube is located at the front end of the connecting tube. The front part of the connecting tube has a sheath core connector and the rear part has a sheath core fixing member. The rear end of the outer sheath base has an outer sheath connector that matches the sheath core connector. The sheath core includes an endoscope channel. The flexible ureteroscope sheath kit is used for:

[0011] Insert the rigid endoscope tube into the device channel, and fix the sheath core connector to the outer sheath connector;

[0012] Insert the flexible endoscope body into the endoscope channel, and fix the sheath core retainer to the front end of the handle of the flexible ureteroscope;

[0013] The rigid endoscope assembled with the flexible ureteroscope sheath kit and the flexible ureteroscope is inserted into the ureter;

[0014] Disconnect the sheath core connector from the outer sheath connector, and remove the sheath core and the flexible ureteroscope.

[0015] Preferably, the connecting tube has a water inlet on its side, and the front end of the rigid endoscope tube has a water spray hole on its side. The water spray hole and the water inlet are connected through the endoscope body channel. There is a gap between the inner wall of the endoscope body channel and the outer side of the flexible endoscope body. When the rigid endoscope tube is inserted into the device channel, the water spray hole is located on the front side of the sheath body's end face. The working process of the ureteroscope flexible sheath kit includes:

[0016] Before the rigid endoscope enters the ureter, the inlet is connected to physiological saline via a booster pump;

[0017] The flow rate of the spray nozzle is controlled during the insertion of the rigid endoscope into the ureter.

[0018] Preferably, the handle of the flexible ureteroscope includes an optical fiber interface and an endoscope inlet, and the operation of the flexible ureteroscope sheath kit includes:

[0019] Insert the flexible endoscope into the device channel;

[0020] The endoscope inlet is connected to saline solution via a booster pump, and the fiber optic interface is connected to an optical fiber.

[0021] Physiological saline solution was introduced through the endoscope inlet;

[0022] The flexible ureteroscope is coaxially rotated within the outer sheath to adjust the angle, and laser lithotripsy is performed using optical fibers.

[0023] Preferably, the sheath body includes an outer sheath water inlet channel, an outer sheath water inlet port, and a negative pressure port. The outer sheath water inlet port is located on the side of the rear part of the sheath body. One end of the outer sheath water inlet channel is connected to the outer sheath water inlet port, and the outlet of the outer sheath water inlet channel is located at the front end of the sheath body. The negative pressure port is connected to the equipment channel. The working process of the ureteroscope sheath kit includes:

[0024] After laser lithotripsy, close the endoscope inlet.

[0025] The outer sheath water inlet is connected to physiological saline via a booster pump, and negative pressure water is drawn in through a negative pressure inlet.

[0026] Preferably, the sheath body comprises a front section and a rear section, which are integrally formed. The front section is made of a flexible material, and the rear section is made of a rigid material. The length of the front section is a preset value. The working process of the ureteroscopic flexible sheath kit includes:

[0027] After inserting the flexible endoscope into the device channel, the flexible endoscope drives the front section of the tube to bend and rotate the ureteroscope to adjust the angle, and then uses optical fiber to perform laser lithotripsy.

[0028] Preferably, the preset value ranges from 2 cm to 15 cm, the sheath body includes a tube made of flexible material, a gap interlayer is provided inside the tube wall, a metal wire is spirally wound inside the gap interlayer, there are gaps between the metal wires in the front section of the tube, and the metal wires are connected and fixed in the rear section of the tube.

[0029] Preferably, the front end of the lens body channel is provided with a transparent lens cover, and the edge of the transparent lens cover is provided with a guide wire hole.

[0030] Preferably, the sheath core fixing component includes a fixing tube, with a sheath core fixing section at the front end and a handle fixing section at the rear end. The fixing tube is made of rigid material. Both the sheath core fixing section and the handle fixing section are fixed by clamps. Both the sheath core fixing section and the handle fixing section include several fixing teeth. The clamps are located on the outside of the fixing teeth, and the inside of the fixing teeth is provided with an anti-slip pad.

[0031] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of the present invention.

[0032] The positive and progressive effects of this invention are as follows:

[0033] This application enables one-step sheath placement, significantly improving surgical efficiency. It has the function of actively dilating the ureter, reducing sheath placement resistance, and further improving the success rate of sheath placement. Utilizing a combination of soft and hard outer sheath, the lumen will not deform under compression. The flexible endoscope can rotate coaxially within the sheath lumen, making it easier to accurately locate the target position. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the ureteroscope sheath kit of Embodiment 1 of the present invention.

[0035] Figure 2 This is another structural schematic diagram of the ureteroscope sheath kit of Embodiment 1 of the present invention.

[0036] Figure 3 This is a schematic diagram of the structure of the flexible ureteroscope sheath in Embodiment 1 of the present invention.

[0037] Figure 4 This is another structural schematic diagram of the ureteroscope sheath kit of Embodiment 1 of the present invention.

[0038] Figure 5 This is another structural schematic diagram of the ureteroscope sheath kit of Embodiment 1 of the present invention.

[0039] Figure 6 This is another structural schematic diagram of the ureteroscope sheath kit of Embodiment 1 of the present invention.

[0040] Figure 7 This is another structural schematic diagram of the ureteroscope sheath kit of Embodiment 1 of the present invention.

[0041] Figure 8 This is another structural schematic diagram of the ureteroscope sheath kit of Embodiment 1 of the present invention.

[0042] Figure 9 This is another structural schematic diagram of the ureteroscope sheath kit of Embodiment 1 of the present invention.

[0043] Figure 10 This is a flowchart illustrating the overall working process of the ureteroscope sheath kit in Embodiment 1 of the present invention. Detailed Implementation

[0044] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0045] Example 1

[0046] In this embodiment, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0047] In this embodiment, the front end refers to the end that is close to the front end of the ureteroscope sheath kit and away from the handle. The positional relationship of each component in this embodiment is described with reference to this positional relationship. The purpose is to facilitate the description of the present invention and simplify the description, rather than to indicate or imply that the device or element referred to must have a specific orientation or be constructed in a specific orientation. Therefore, it should not be construed as a limitation of the present invention.

[0048] See Figures 1 to 9 This embodiment provides a ureteroscope sheath kit.

[0049] The ureteroscope sheath kit includes an outer sheath 100 (ureteroscope sheath) and a sheath core 101.

[0050] The outer sheath includes a sheath body 1002 and an outer sheath base 1003, and the inner side of the sheath body 1002 is provided with an equipment channel 1008.

[0051] The sheath core 101 includes a rigid lens tube 1011 and a connecting tube 1012. The rigid lens tube 1011 is located at the front end of the connecting tube. The front part of the connecting tube 1012 is provided with a sheath core connector 1013 and the rear part is provided with a sheath core fixing member 1014.

[0052] The sheath core retainer 1014 is used to secure the front end of the handle 200 of the flexible ureteroscope. The sheath core 101 also includes a scope channel. The size of the scope channel matches the size of the flexible endoscope body.

[0053] The rear end of the outer sheath base is provided with an outer sheath connector 1001 that matches the sheath core connector 1013.

[0054] The outer sheath includes a device channel whose size matches that of the rigid endoscope tube. The rigid endoscope tube can be inserted into the device channel, and after being inserted into the device channel, the rigid endoscope tube provides a certain rigidity to the outer sheath, allowing the outer sheath to be inserted into the ureter in a rigid endoscope manner.

[0055] The outer sheath connector is also made of rigid material. After the sheath core is inserted into the outer sheath and fixed to the outer sheath connector 1001 by threads, the ureteroscope flexible sheath kit has the function of a rigid endoscope. This combination of the outer sheath and the sheath core enables one-step sheath placement.

[0056] The insertion of a flexible endoscope body into the endoscope channel makes the placement of a rigid endoscope visible.

[0057] Currently, flexible ureteroscope sheaths are used for passive ureteral dilation: under the guidance of a guidewire, the flexible ureteroscope sheath and sheath core are actively pushed blindly. After passively dilating the ureter, the sheath and sheath core are pushed to the ureteropelvic junction. Therefore, the success rate of one-stage sheath placement is currently around 60%.

[0058] Moreover, existing techniques all employ a step-by-step sheath placement method: first, a guidewire is placed under ureteroscopy, the ureteroscope is withdrawn, and a ureteral sheath and sheath core are inserted along the guidewire, followed by the insertion of a flexible ureteroscope. This step-by-step sheath placement method severely affects surgical efficiency and success rate. The success rate of single-stage sheath placement is only about 60%, and complications are easily caused during the sheath placement process, such as ureteral laceration (breakage in severe cases), renal pelvis perforation, and improper sheath placement (blind sheath placement, sometimes the sheath is in the middle of the ureter, and sometimes the sheath has punctured the renal pelvis).

[0059] This application utilizes the special structure of the sheath core to transform the flexible ureteroscope sheath into a rigid endoscope structure, allowing for direct sheath placement via a visual endoscope, which offers the following advantages:

[0060] Modular structure: rigid sheath core + flexible lens body + detachable working channel;

[0061] One-step insertion: Sheath placement and preliminary inspection are completed simultaneously;

[0062] Quick conversion: The stone crushing operation can begin after removing the sheath core.

[0063] The working process of the ureteroscope sheath kit includes:

[0064] Insert the rigid endoscope tube into the device channel, and fix the sheath core connector to the outer sheath connector;

[0065] Insert the flexible endoscope body into the endoscope channel, and fix the sheath core retainer to the front end of the handle of the flexible ureteroscope;

[0066] The rigid endoscope assembled with the flexible ureteroscope sheath kit and the flexible ureteroscope is inserted into the ureter;

[0067] Disconnect the sheath core connector from the outer sheath connector, and remove the sheath core and the flexible ureteroscope.

[0068] Both the rigid mirror tube and the connecting tube are made of rigid materials, and in this embodiment, they are made of stainless steel. The side of the connecting tube 1012 is provided with a water inlet 1016, and the front side of the rigid mirror tube is provided with a water spray hole 1017.

[0069] The water spray hole and the water inlet are connected through the endoscope body channel. There is a gap between the inner wall of the endoscope body channel and the outer side of the flexible endoscope body. When the rigid endoscope tube is inserted into the device channel, the water spray hole is located on the front side of the end face of the sheath body.

[0070] The water spray holes are located on the front side of the front end of the outer sheath. There are 2n water spray holes, which are evenly distributed on the circumference of the front end of the outer sheath.

[0071] The sheath core is provided with a sheath core water inlet channel (scope body channel), and the front end of the sheath core has water spray holes (multiple water outlet holes, which can be evenly arranged in a 360° ring on the same plane, or dispersed in a 360° arrangement on different planes). When it enters the ureter, water enters through the sheath core water inlet channel, and water is sprayed out from the water outlet holes, spraying 360° onto the ureter wall, which is equivalent to flexibly expanding the ureter, making it easier for the rear sheath to advance, playing a role in actively expanding the ureter, and improving the success rate of sheath placement.

[0072] The operation of the ureteroscope sheath kit includes:

[0073] Before the rigid endoscope enters the ureter, the inlet is connected to physiological saline via a booster pump;

[0074] The flow rate of the spray nozzle is controlled during the insertion of the rigid endoscope into the ureter.

[0075] The handle of the flexible ureteroscope includes an optical fiber interface and an endoscope inlet. The operation of the flexible ureteroscope sheath kit includes:

[0076] Insert the flexible endoscope into the device channel;

[0077] The endoscope inlet is connected to saline solution via a booster pump, and the fiber optic interface is connected to an optical fiber.

[0078] Physiological saline solution was introduced through the endoscope inlet;

[0079] The flexible ureteroscope is coaxially rotated within the outer sheath to adjust the angle, and laser lithotripsy is performed using optical fibers.

[0080] The sheath body includes an outer sheath water inlet channel 1005 and an outer sheath water inlet interface 1006. The outer sheath water inlet interface is located on the side of the rear part of the sheath body. One end of the outer sheath water inlet channel is connected to the outer sheath water inlet interface, and the water outlet of the outer sheath water inlet channel is located at the front end of the sheath body.

[0081] The water inlet channel of the outer sheath is isolated from the equipment channel by a C-shaped diaphragm.

[0082] The flexible ureteroscope sheath also includes a negative pressure interface 1007, which is connected to the device channel.

[0083] The rear end of the sheath body is fixed to the outer sheath base, and the outer sheath base is provided with a pipe that communicates with the equipment pipe. The negative pressure interface 1007 is located on the side of the outer sheath base.

[0084] The outer sheath (ureteroscope sheath) has two channels: one for water inlet and one for negative suction (equipment channel). When the stones are broken up and negative pressure is applied to absorb the fragments, the flexible endoscope often needs to be withdrawn from the outer sheath channel. At this time, the kidney is under negative pressure, and the kidney space collapses due to the negative pressure, compressing the stones and obstructing their negative suction removal. Furthermore, if the negative pressure in the kidney is too high, the mucosa on the surface of the renal pelvis or calyces may rupture and bleed, affecting subsequent surgical procedures.

[0085] At this time, fluid is continuously infused into the renal pelvis and calyces through the inlet channel to maintain the pressure balance within the kidney. At the same time, the negative suction channel performs negative suction lithotripsy. The inlet and suction create a water circulation, which can ensure the pressure balance within the kidney, avoid damage and bleeding of the renal pelvis and calyces mucosa, and also disperse the lithotripsy fragments in the renal pelvis through water circulation, making it easier for negative suction and improving the efficiency of negative suction lithotripsy.

[0086] The operation of the ureteroscope sheath kit includes:

[0087] After laser lithotripsy, close the endoscope inlet.

[0088] The outer sheath water inlet is connected to physiological saline via a booster pump, and negative pressure water is drawn in through a negative pressure inlet.

[0089] The sheath body comprises a front tube and a rear tube, which are integrally formed. The front tube is made of a flexible material, while the rear tube is made of a rigid material. The length of the front tube is a preset value.

[0090] The preset value ranges from 2 cm to 15 cm, and is preferably 10 cm in this embodiment. The sheath body includes a flexible tube with a gap layer inside the tube wall. A metal wire 1004 is spirally wound inside the gap layer. There are gaps between the metal wires in the front section of the tube, and the metal wires are connected and fixed in the rear section of the tube. The metal wire can be fixed by welding or bonding.

[0091] The outer sheath has a flexible 10cm front end (a rigid material forming a spring coil, covered with a layer of polymer plastic film), which makes it easy for the flexible endoscope to move the front end of the sheath to make 360° turns, to find and break up stones in each renal pelvis and calyces, and to use negative suction to break up stones.

[0092] The outer sheath portion, extending 10cm from the front end, is made of rigid material (the rigid material forms spring coils, which are tightly welded together, and all the welded spring coils form a rigid pipe) to create a rigid pipe.

[0093] The purpose is to ensure that the sheath does not deform under pressure during surgery, so that the flexible endoscope can rotate 360° coaxially within the sheath lumen;

[0094] Secondly, the male urethra is curved due to the special anatomy of the prostate and bulbar portion. Previously, the flexible endoscope sheath would bend at this point, and the endoscope could not rotate coaxially within the curved duct, affecting the operation.

[0095] The outer sheath has a rigid tubular structure at the rear end, which enters the male urethra, bladder, and ureter (similar to a rigid ureteroscope). It can keep the ureter, bladder, and urethra in a straight line and eliminate urethral curvature. At this time, the outer sheath is a straight lumen with a soft front end and a hard rear end. External pressure does not deform the lumen. At this time, the flexible endoscope is easy to enter and exit, and it can drive the flexible part at the front end of the sheath to make any 360° turn according to the needs of the operation, thereby improving the efficiency of the operation.

[0096] The operation of the ureteroscope sheath kit includes:

[0097] After inserting the flexible endoscope into the device channel, the flexible endoscope drives the front section of the tube to bend and rotate the ureteroscope to adjust the angle, and then uses optical fiber to perform laser lithotripsy.

[0098] A transparent lens cap 1018 is provided at the front end of the lens body channel.

[0099] The edge of the transparent lens cover is provided with a guide wire hole 1019.

[0100] The outer sheath includes a sheath body 1002 and an outer sheath base 1003. The outer sheath connector is located at the rear end of the outer sheath base. The outer sheath connector includes a mounting groove, and a sealing gasket 1015 is provided between the mounting groove and the sheath core connector.

[0101] The sheath core connector is connected to the outer sheath connector via threads.

[0102] The sheath core fixing component includes a fixing tube 102, with a sheath core fixing section 1021 at the front end and a handle fixing section 1022 at the rear end. The fixing tube is made of a rigid material.

[0103] Both the sheath core fixing section and the handle fixing section are fixed by clamp 103.

[0104] Both the sheath core fixing section and the handle fixing section include several fixing teeth 104. The clamp is located on the outside of the fixing teeth, and the inside of the fixing teeth is provided with an anti-slip pad.

[0105] See Figure 10 The overall working process of the ureteroscope sheath kit includes:

[0106] Step 100: Insert the rigid endoscope tube into the device channel, and fix the sheath core connector to the outer sheath connector;

[0107] Step 101: Insert the flexible endoscope body into the endoscope channel, and fix the sheath core retainer to the front end of the handle of the flexible ureteroscope;

[0108] Step 102: Insert the ureteroscope sheath kit and the rigid endoscope assembled from the flexible ureteroscope into the ureter;

[0109] Step 102 further includes connecting the inlet to saline solution via a booster pump before the rigid endoscope is inserted into the ureter, and controlling the flow rate of the spray nozzle during the insertion of the rigid endoscope into the ureter.

[0110] Step 103: Disconnect the connection between the sheath core connector and the outer sheath connector, and remove the sheath core and the flexible ureteroscope.

[0111] Step 104: Insert the flexible endoscope body into the device channel;

[0112] Step 105: Connect the endoscope inlet to physiological saline via a booster pump, and connect the fiber optic interface to the optical fiber.

[0113] Step 106: Connect physiological saline solution through the endoscope inlet;

[0114] Step 107: After inserting the flexible endoscope into the device channel, the flexible endoscope drives the front section of the tube to bend and rotate the ureteroscope to adjust the angle, and then uses optical fiber to perform laser lithotripsy.

[0115] Step 108: After laser lithotripsy, close the endoscope inlet.

[0116] Step 109: The outer sheath water inlet is connected to physiological saline via a booster pump, and negative pressure water is drawn in through the negative pressure inlet.

[0117] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A ureteroscope sheath kit for use with a flexible ureteroscope, characterized in that, The flexible ureteroscope sheath kit includes an outer sheath and a sheath core. The outer sheath includes a sheath body and an outer sheath base. An equipment channel is provided inside the sheath body. The sheath core includes a rigid endoscope tube and a connecting tube. The rigid endoscope tube is located at the front end of the connecting tube. A sheath core connector is located at the front of the connecting tube, and a sheath core fixing member is located at the rear of the connecting tube. An outer sheath connector matching the sheath core connector is located at the rear end of the outer sheath base. The sheath core includes an endoscope channel. The flexible ureteroscope sheath kit is used for: Insert the rigid endoscope tube into the device channel, and fix the sheath core connector to the outer sheath connector; Insert the flexible endoscope body into the endoscope channel, and fix the sheath core retainer to the front end of the handle of the flexible ureteroscope; The rigid endoscope assembled with the flexible ureteroscope sheath kit and the flexible ureteroscope is inserted into the ureter; Disconnect the sheath core connector from the outer sheath connector, and remove the sheath core and the flexible ureteroscope.

2. The ureteroscope sheath kit as described in claim 1, characterized in that, The connecting tube has a water inlet on its side, and the front end of the rigid endoscope tube has a water spray hole. The water spray hole and the water inlet are connected through the endoscope body channel. There is a gap between the inner wall of the endoscope body channel and the outer side of the flexible endoscope body. When the rigid endoscope tube is inserted into the device channel, the water spray hole is located on the front side of the sheath body's main end face. The working process of the ureteroscope sheath kit includes: Before the rigid endoscope enters the ureter, the inlet is connected to physiological saline via a booster pump; The flow rate of the spray nozzle is controlled during the insertion of the rigid endoscope into the ureter.

3. The ureteroscope sheath kit as described in claim 1, characterized in that, The handle of the flexible ureteroscope includes an optical fiber interface and an endoscope inlet. The operation of the flexible ureteroscope sheath kit includes: Insert the flexible endoscope into the device channel; The endoscope inlet is connected to saline solution via a booster pump, and the fiber optic interface is connected to an optical fiber. Physiological saline solution was introduced through the endoscope inlet; The flexible ureteroscope is coaxially rotated within the outer sheath to adjust the angle, and laser lithotripsy is performed using optical fibers.

4. The ureteroscope sheath kit as described in claim 3, characterized in that, The sheath body includes an outer sheath water inlet channel, an outer sheath water inlet port, and a negative pressure port. The outer sheath water inlet port is located on the side of the rear part of the sheath body. One end of the outer sheath water inlet channel is connected to the outer sheath water inlet port, and the outlet of the outer sheath water inlet channel is located at the front end of the sheath body. The negative pressure port is connected to the equipment channel. The working process of the ureteroscope sheath kit includes: After laser lithotripsy, close the endoscope inlet. The outer sheath water inlet is connected to physiological saline via a booster pump, and negative pressure water is drawn in through a negative pressure inlet.

5. The ureteroscope sheath kit as described in claim 3, characterized in that, The sheath body comprises a front section and a rear section, which are integrally formed. The front section is made of a flexible material, while the rear section is made of a rigid material. The length of the front section is a preset value. The working process of the ureteroscopic flexible sheath kit includes: After inserting the flexible endoscope into the device channel, the flexible endoscope drives the front section of the tube to bend and rotate the ureteroscope to adjust the angle, and then uses optical fiber to perform laser lithotripsy.

6. The ureteroscope sheath kit as described in claim 5, characterized in that, The preset value ranges from 2 cm to 15 cm. The sheath body includes a tube made of flexible material. A gap interlayer is provided inside the tube wall. A metal wire is spirally wound inside the gap interlayer. There are gaps between the metal wires in the front section of the tube, and the metal wires are connected and fixed in the rear section of the tube.

7. The ureteroscope sheath kit as described in claim 1, characterized in that, The front end of the lens body channel is provided with a transparent lens cover, and the edge of the transparent lens cover is provided with a guide wire hole.

8. The ureteroscope sheath kit as described in claim 1, characterized in that, The sheath core fixing component includes a fixing tube, with a sheath core fixing section at the front end and a handle fixing section at the rear end. The fixing tube is made of rigid material. Both the sheath core fixing section and the handle fixing section are fixed by clamps. Both the sheath core fixing section and the handle fixing section include several fixing teeth. The clamps are located on the outside of the fixing teeth, and the inside of the fixing teeth is provided with anti-slip pads.

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