Double-cavity catheter and visual catheter suite

Abstract

The double-cavity catheter comprises a lens through hole, a balloon and a catheter body, the catheter body comprises a catheterization channel and a balloon channel, a transparent section is arranged at the front end of the catheter body and made of a flexible material, the lens through hole is formed in the front end of the transparent section, the balloon channel is made of a flexible material, and the lens through hole is communicated with the balloon channel. The diameter of the lens through hole is larger than that of the endoscope image head and smaller than that of the endoscope soft lens body, the balloon is arranged on the rear side of the lens through hole and communicated with the balloon channel, and the rear end of the balloon channel is provided with a balloon channel connector. According to the urethral catheter dilator, the success rate of direct installation of the urethral catheter can be greatly increased, the use frequency of the urethral catheter dilator is reduced, the urethral dilation efficiency of the dilator is improved under the condition that the dilator is used, the urethral catheterization process is safe and reliable, the probability of bladder puncture is reduced, meanwhile, an endoscope can be protected, and the use cost of the endoscope is reduced; the service life of the endoscope is prolonged.

Description

Technical Field

[0001] This invention relates to a dual-lumen urinary catheter and a visualization urinary catheter kit. Background Technology

[0002] With the aging of the global population, the number of elderly people worldwide is gradually increasing. Many elderly men, especially those over 70, suffer from varying degrees of benign prostatic hyperplasia (BPH). If the hyperplasia becomes severe, or if they experience stimulation from alcohol or spicy foods, urinary retention is highly likely. In such cases, the only solution for urination is indwelling catheterization. However, due to urethral stricture caused by BPH in elderly men, if indwelling catheterization fails, cystostomy under local anesthesia is necessary. Some elderly patients also develop neurogenic bladder due to bladder dysfunction, lumbar or cervical spine diseases, or sequelae of cerebrovascular accidents, making it impossible for them to urinate spontaneously, thus requiring long-term catheter replacement.

[0003] However, the current clinical practice of indwelling urinary catheters has many drawbacks, as follows:

[0004] When an indwelling catheter is placed without anesthesia, all patients experience varying degrees of pain and discomfort, especially those with urethral stricture. Urethral dilation often requires a blind procedure, which can be extremely painful for patients. In severe cases, damage to the urethra can lead to other complications.

[0005] All procedures were performed under blind methods. This means that the procedure was performed based on the doctor's experience, without knowing the condition of the urethra. Performing procedures under blind methods can easily lead to iatrogenic injuries.

[0006] If urethral stricture occurs and indwelling catheterization fails, cystostomy or urethroscopy in the operating room is necessary. Cystostomy involves making a hole above the pubic bone to access the bladder and inserting a drainage tube to drain urine. During the procedure, there is a high risk of intestinal injury, especially in patients with inguinal hernias. Furthermore, cystostomy affects the patient's ability to wear pants, particularly in winter, impacting their daily life. Urethroscopy in the operating room, on the other hand, requires extensive pre-operative preparation, significantly consuming the patient's time and carrying a risk of bladder rupture.

[0007] Currently, there are portable disposable flexible cystoscopes available, but these cystoscopes contain chips and are discarded after a single use, which is a huge waste of medical resources. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to overcome the shortcomings of the existing technology in that the catheterization process is not safe and reliable with a low success rate and the endoscope is expensive. The invention provides a double-lumen catheter and a visualization catheter kit that can significantly improve the success rate of direct catheter installation and reduce the frequency of catheter dilator use.

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

[0010] A double-lumen urinary catheter, characterized in that the double-lumen urinary catheter includes a lens port, a balloon, and a catheter body.

[0011] The catheter body includes a catheterization channel and a balloon channel. The front end of the catheter body has a transparent section made of flexible material. The front end of the transparent section has a lens aperture. The diameter of the lens aperture is larger than the diameter of the endoscope's lens head but smaller than the diameter of the flexible endoscope body.

[0012] The balloon is located behind the lens aperture, and the balloon is connected to the balloon channel. The balloon channel has a balloon channel interface at its rear end.

[0013] Preferably, the rear end of the double-lumen catheter is provided with an insertion tube section, which is inserted into the endoscope protective sleeve of the flexible endoscope body.

[0014] Preferably, the endoscope protective sleeve includes a base, a protective sleeve, and a Y-shaped tube. The base is snapped into the front end of the endoscope handle. The protective sleeve is made of flexible material and has a lens channel and a guide wire channel for installing the flexible endoscope body inside. The guide wire channel communicates with the Y-shaped tube. The Y-shaped tube is located on the protective sleeve and in front of the base. The connection position between the Y-shaped tube and the protective sleeve is provided with a connector that matches the insertion tube section. The outer diameter of the front end of the connector is smaller than the inner diameter of the insertion tube section, and the outer diameter of the rear end is larger than the inner diameter of the insertion tube section.

[0015] Preferably, the dual-lumen catheter further includes a side hole located between the drainage hole and the balloon, the side hole communicating with the catheter channel, and the transparent section being made of transparent silicone.

[0016] This application also provides a visualization catheter kit, characterized in that the visualization catheter kit includes a double-lumen catheter as described above and an endoscope protective sleeve.

[0017] Preferably, the endoscope protective sleeve includes a base, a protective sleeve, and a Y-shaped tube, and the rear end of the base is provided with a snap-fit ​​component that snaps onto the front end of the endoscope handle;

[0018] The protective sleeve is made of flexible material. The front end of the protective sleeve has a transparent membrane structure and the rear end is connected to the base. The protective sleeve has a lens channel and a guide wire channel for installing the flexible endoscope body.

[0019] The guide wire channel has a guide wire outlet at the front end and is connected to the outlet of the Y-shaped tube at the rear end. The Y-shaped tube is located on the front side of the base and also includes a guide wire inlet and a water inlet. The Y-shaped tube is a three-way tube.

[0020] Preferably, the length of the protective sleeve is less than the length of the flexible endoscope body. The transparent membrane structure includes a transparent membrane and a connecting tube. The transparent membrane is located at one end of the connecting tube, and the other end of the connecting tube is connected to the protective sleeve. At least two limiting strips are provided on the inner wall of the connecting tube, and the limiting strips match the limiting groove at the front end of the flexible endoscope body.

[0021] Preferably, a sealing structure is provided at the rear end of the guidewire inlet, the sealing structure sealing the gap between the guidewire and the inner wall of the guidewire inlet, the sealing structure including a rubber ring disposed on the inner wall of the guidewire inlet, the diameter of the rubber ring being smaller than the diameter of the guidewire; or,

[0022] The sealing structure is an iris structure, which includes an iris base, a blade, and a guide cover. The iris base is fixed to the rear end of the guide wire inlet. The iris base is provided with a sliding groove. One side of the blade is provided with a slider that matches the sliding groove, and the other side is provided with a guide protrusion. One side of the guide cover is provided with a guide hole that matches the guide protrusion.

[0023] Preferably, the guidewire includes a guidewire body and a guidewire tip, wherein the guidewire tip is elastic and has a hemispherical shape.

[0024] Preferably, the visualization catheter kit further includes a urethral dilator, which includes several hollow dilators with different outer diameters. Each hollow dilator has a guide wire channel inside. Each hollow dilator includes a dilator body and a dilator front end. The angle between the dilator front end and the dilator body is greater than 160 degrees and less than 180 degrees. The outer diameter of the dilator front end increases sequentially from front to back.

[0025] Preferably, the operation of the visualized catheter kit includes:

[0026] Insert the flexible endoscope body into the endoscope protective sleeve, and then insert the endoscope body and endoscope protective sleeve together into the urinary catheter;

[0027] The guidewire is inserted into the guidewire inlet and the water inlet is connected to physiological saline for irrigation, respectively.

[0028] Anesthesia is injected into the urethra to perform urethral surface anesthesia. Then, the catheter, flexible endoscope, and endoscope protective sheath are inserted into the urethra together. The direction of the tip of the flexible endoscope is adjusted by the endoscope lever.

[0029] Determine if there is urethral stricture:

[0030] If so, insert the guidewire through the guidewire channel of the protective sleeve to cross the narrow passage. Forcefully insert the catheter under direct vision along the guidewire. Once the narrow passage is crossed, inject saline solution into the balloon. Then, withdraw the flexible endoscope, protective sleeve, and guidewire. Connect the catheter to a urine bag. If the narrow passage is not crossed, withdraw the catheter, flexible endoscope, and protective sleeve. Insert the flexible endoscope and protective sleeve together into the urethra until the tip of the flexible endoscope and protective sleeve enters the bladder. Confirm that the tip of the guidewire is completely inside the bladder using the display screen. Then, keep the guidewire in place and withdraw the endoscope and protective sleeve along the guidewire. Use a urethral dilator to gradually dilate the urethra to the target size. Insert the catheter along the guidewire using the flexible endoscope and protective sleeve until the tip of the catheter enters the bladder. Inject saline solution into the balloon. Then, withdraw the flexible endoscope, protective sleeve, and guidewire. Connect the catheter to a urine bag.

[0031] Otherwise, insert the urinary catheter into the urethra using the flexible endoscope and endoscope sheath together until the tip of the catheter enters the bladder. Inject saline into the balloon, then withdraw the flexible endoscope, endoscope sheath, and guidewire. Connect the urinary catheter to a urine bag.

[0032] 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.

[0033] The positive and progressive effects of this invention are as follows:

[0034] This invention can significantly improve the success rate of direct catheter installation, reduce the frequency of use of catheter dilators, improve the urethral dilation efficiency of dilators when dilators are used, ensure the safety and reliability of the catheterization process, reduce the chance of needing bladder puncture, protect the endoscope, reduce the cost of using the endoscope, and increase the service life of the endoscope. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of the double-lumen catheter kit of Embodiment 1 of the present invention.

[0036] Figure 2 This is a schematic diagram of the structure of the double-lumen urinary catheter of Embodiment 1 of the present invention.

[0037] Figure 3 This is a schematic diagram of the structure of the double-lumen catheter kit of Embodiment 1 of the present invention.

[0038] Figure 4 This is another structural schematic diagram of the double-lumen catheter kit of Embodiment 1 of the present invention.

[0039] Figure 5 This is a schematic diagram of the endoscope protective sleeve according to Embodiment 1 of the present invention.

[0040] Figure 6 This is a partially enlarged schematic diagram of the double-lumen catheter kit of Embodiment 1 of the present invention.

[0041] Figure 7 This is a schematic diagram of the sealing structure of Embodiment 1 of the present invention.

[0042] Figure 8 This is another structural schematic diagram of the sealing structure of Embodiment 1 of the present invention.

[0043] Figure 9 This is a schematic diagram of the structure of the visualized urinary catheter kit of Embodiment 1 of the present invention.

[0044] Figure 10 This is a schematic diagram of the urethral dilator according to Embodiment 1 of the present invention. Detailed Implementation

[0045] 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.

[0046] Example 1

[0047] 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.

[0048] In this embodiment, the front end refers to the end that is close to the tip (blind end) and far from the base (endoscope 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 component 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.

[0049] See Figures 1 to 10 This embodiment provides a visualization catheter kit, which includes a dual-lumen catheter 100 and an endoscope 101. The visualization catheter kit of this embodiment can be used with an endoscope to form a complete system, or it can be applied to existing endoscopes.

[0050] The dual-lumen catheter 100 includes a lens through-hole 1007, a balloon 1002, and a catheter body 1003.

[0051] The catheter body 1003 includes a catheter channel 1004 and a balloon channel 1005.

[0052] The front end of the catheter body 1003 is provided with a transparent section 1006.

[0053] The transparent segment is made of flexible material, and the front end of the transparent segment 1006 is provided with a lens through hole 1007. The diameter of the lens through hole is larger than the diameter of the endoscope mirror head 201 and smaller than the diameter of the flexible endoscope body 200.

[0054] The balloon 1002 is located behind the lens through hole. The balloon 1002 is connected to the balloon channel 1005. The balloon channel 1005 has a balloon channel interface 10051 at its rear end.

[0055] The rear end of the double-lumen catheter 100 is provided with an insertion tube section 1009, which is inserted into the endoscope protective sleeve 102 of the flexible endoscope body 200.

[0056] See Figure 5 The endoscope protective sleeve 102 includes a base 1021, a protective sleeve 1022, and a Y-shaped tube 1023.

[0057] The base 1021 is engaged with the front end of the endoscope handle.

[0058] The protective sleeve 1022 is made of flexible material, and the protective sleeve 1022 has a lens channel 10221 and a guide wire channel 10222 for installing the flexible endoscope body.

[0059] The guide wire channel is connected to the Y-shaped tube 1023.

[0060] The Y-shaped tube is mounted on the protective sleeve and located on the front side of the base.

[0061] The connection point between the Y-shaped tube and the protective sleeve is provided with a connector 1024 that matches the insertion tube section.

[0062] The outer diameter of the front end of the connector 1024 is smaller than the inner diameter of the connector section 1009, and the outer diameter of the rear end is larger than the inner diameter of the connector section.

[0063] The dual-lumen catheter also includes a side hole located between the drainage hole and the balloon, which communicates with the catheterization channel. The transparent section is made of transparent silicone.

[0064] Specifically, the rear end of the base 1021 is provided with a snap-fit ​​member 1026 for snapping the front end of the endoscope handle;

[0065] The protective sleeve is made of flexible material. The front end of the protective sleeve 1022 is provided with a transparent membrane structure 10223 and the rear end is connected to the base. The protective sleeve is provided with a lens channel 10221 and a guide wire channel 10222 for installing the flexible endoscope body.

[0066] The guide wire channel has a guide wire outlet at the front end and is connected to the outlet of the Y-shaped tube at the rear end.

[0067] The Y-shaped tube 1023 is located on the front side of the base. The Y-shaped tube also includes a guide wire inlet 10231 and a water inlet 10232. The Y-shaped tube is a three-way tube.

[0068] The protective sleeve has a certain degree of flexibility and its length is shorter than that of the flexible endoscope body.

[0069] The transparent membrane structure 10223 includes a transparent membrane 10224 and a connecting tube 10225. The transparent membrane is disposed at one end of the connecting tube, and the other end of the connecting tube is connected to the protective sleeve 1022. At least two limiting strips 1025 are provided on the inner wall of the connecting tube, and the limiting strips 1025 match the limiting groove at the front end of the flexible endoscope body.

[0070] A sealing structure is provided at the rear end of the guide wire inlet 10231, which seals the gap between the guide wire 300 and the inner wall of the guide wire inlet 10231.

[0071] The sealing structure includes a rubber ring disposed on the inner wall of the guidewire inlet, the diameter of the rubber ring being smaller than the diameter of the guidewire; the sealing structure may also be a structure similar to an oil seal or a structure similar to a dust lip, to prevent saline from overflowing from the guidewire inlet.

[0072] In other embodiments, the sealing structure is an iris structure, which includes an iris base 400, a blade 401, and a guide cover 402. The iris base is fixed to the rear end of the guidewire inlet 10231. The iris base has a groove 403. One side of the blade has a slider that matches the groove, and the other side has a guide protrusion 404. One side of the guide cover has a guide hole 405 that matches the guide protrusion. When the guide cover is rotated clockwise, this channel unfolds, facilitating the insertion of the guidewire. After the guidewire 300 is inserted, rotating it counterclockwise retracts and locks the blade, preventing the infused saline solution from flowing back out.

[0073] The guidewire includes a guidewire body and a guidewire tip, the guidewire tip being elastic and having a hemispherical shape.

[0074] The guide wire tip has a certain degree of elasticity and can extend out from the lens through-hole.

[0075] The urethral dilator includes several hollow dilators with different outer diameters. Hollow dilators with different outer diameters mean that the hollow dilator includes multiple hollow dilators with different outer diameters to dilate the urethra step by step.

[0076] The hollow expander has a guide wire channel (expander channel 502) inside. Each hollow expander includes an expander body 500 and an expander front end 501. The angle between the expander front end and the expander body is greater than 160 degrees and less than 180 degrees, preferably 165 degrees. The outer diameter of the expander front end increases sequentially from front to back.

[0077] Insert the flexible endoscope body into the endoscope protective sleeve, and then insert the endoscope body and endoscope protective sleeve together into the urinary catheter;

[0078] The guidewire is inserted into the guidewire inlet and the water inlet is connected to physiological saline for irrigation, respectively.

[0079] Anesthesia is injected into the urethra to perform urethral surface anesthesia. Then, the catheter, flexible endoscope, and endoscope protective sheath are inserted into the urethra together. The direction of the tip of the flexible endoscope is adjusted by the endoscope lever.

[0080] Determine if there is urethral stricture:

[0081] If so, insert the guidewire through the guidewire channel of the protective sleeve to cross the narrow passage. Forcefully insert the catheter under direct vision along the guidewire. Once the narrow passage is crossed, inject saline solution into the balloon. Then, withdraw the flexible endoscope, protective sleeve, and guidewire. Connect the catheter to a urine bag. If the narrow passage is not crossed, withdraw the catheter, flexible endoscope, and protective sleeve. Insert the flexible endoscope and protective sleeve together into the urethra until the tip of the flexible endoscope and protective sleeve enters the bladder. Confirm that the tip of the guidewire is completely inside the bladder using the display screen. Then, keep the guidewire in place and withdraw the endoscope and protective sleeve along the guidewire. Use a urethral dilator to gradually dilate the urethra to the target size. Insert the catheter along the guidewire using the flexible endoscope and protective sleeve until the tip of the catheter enters the bladder. Inject saline solution into the balloon. Then, withdraw the flexible endoscope, protective sleeve, and guidewire. Connect the catheter to a urine bag.

[0082] Otherwise, insert the urinary catheter into the urethra using the flexible endoscope and endoscope sheath together until the tip of the catheter enters the bladder. Inject saline into the balloon, then withdraw the flexible endoscope, endoscope sheath, and guidewire. Connect the urinary catheter to a urine bag.

[0083] During the specific operation, the endoscope is inserted into the protective sleeve of the endoscope, and then the endoscope and sleeve are inserted together into the double-lumen catheter.

[0084] The sheath has a Y-channel, one end connected to saline irrigation, and the other end to the guidewire insertion point.

[0085] The catheter is inserted into the urethra together with the guidewire. During the procedure, the direction of the tip is adjusted using a lever. At this point, saline solution is connected to the guidewire channel and inserted into the urethra together. If urethral stricture is found and the catheter cannot pass through the stricture, a guidewire is inserted into the guidewire channel to pass through the stricture. The catheter is then forcefully inserted under direct vision along the guidewire. In actual operation, it can pass through the stricture in 90% of cases, which greatly improves the success rate of direct catheter installation and reduces the frequency of use of catheter dilators.

[0086] Continue until the tip of the catheter enters the bladder, then inject 15ml of normal saline into the balloon (the amount needed for injection), and then withdraw the endoscope, sheath, and guidewire, and connect the urine bag.

[0087] If urethral stricture is found during the procedure and the procedure is impossible, all instruments should be removed. The sheath and scope should be removed from the urethral tube. The sheath should have a Y-channel, one end connected to normal saline for irrigation, and the other end inserted with a guidewire. The scope should then be re-entered into the urethra (sheath and scope 2.5mm) until it reaches the bladder. After the guidewire is left in place, the scope and sheath should be removed.

[0088] At this point, the guidewire is indwelling in the urethra (the soft part at the tip is in the bladder, the middle part is in the urethra, and the posterior part is outside the urethra). Insert the tail of the guidewire into a hollow dilator with a 15° bend, starting with F12, bend upwards (towards the patient's abdomen). Keep the guidewire in place and push the dilator into the bladder. Then withdraw the F12 dilator and insert F14, repeating this process step-by-step until F22 (if dilated to F22, an F20 catheter will be selected later; if dilated to F20, an F20 catheter will be selected later. In principle, the catheter should be F2 smaller than the dilator). Urethral dilation is now complete. Insert the scope with the sheath into the catheter, insert the guidewire into the catheter, and open the saline solution. Guide the catheter into the bladder along the guidewire for visualization. Inject 15ml of saline into the catheter balloon, then withdraw the guidewire, sheath, and scope.

[0089] 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, and all such changes and modifications shall fall within the scope of protection of the present invention.

Claims

1. A double-lumen urinary catheter, characterized in that, The dual-lumen catheter includes a lens port, a balloon, and a catheter body. The catheter body includes a catheter channel and a balloon channel. The front end of the catheter body has a transparent section made of flexible material. The front end of the transparent section has a lens aperture, the diameter of which is larger than the diameter of the endoscopic lens. The balloon is located behind the lens aperture, and the balloon is connected to the balloon channel. The balloon channel has a balloon channel interface at its rear end.

2. The double-lumen urinary catheter as described in claim 1, characterized in that, The rear end of the double-lumen catheter is provided with an insertion tube section, which is inserted into the endoscope protective sleeve of the flexible endoscope body.

3. The double-lumen urinary catheter as described in claim 2, characterized in that, The endoscope protective sleeve includes a base, a protective sleeve, and a Y-shaped tube. The base is snapped into the front end of the endoscope handle. The protective sleeve is made of flexible material and has a lens channel and a guide wire channel for installing the flexible endoscope body inside the protective sleeve. The guide wire channel communicates with the Y-shaped tube. The Y-shaped tube is located on the protective sleeve and in front of the base. At the connection point between the Y-shaped tube and the protective sleeve, there is a connector that matches the insertion tube section. The outer diameter of the front end of the connector is smaller than the inner diameter of the insertion tube section, and the outer diameter of the rear end is larger than the inner diameter of the insertion tube section.

4. The double-lumen urinary catheter as described in claim 1, characterized in that, The dual-lumen catheter also includes a side hole located between the drainage hole and the balloon, which communicates with the catheterization channel. The transparent section is made of transparent silicone.

5. A visual catheter kit, characterized in that, The visualization catheter kit includes a double-lumen catheter as described in any one of claims 1 to 4 and an endoscope protective sleeve.

6. The visual catheter kit as described in claim 5, characterized in that, The endoscope protective sleeve includes a base, a protective sleeve, and a Y-shaped tube. The rear end of the base is provided with a snap-fit ​​component that snaps onto the front end of the endoscope handle. The protective sleeve is made of flexible material. The front end of the protective sleeve has a transparent membrane structure and the rear end is connected to the base. The protective sleeve has a lens channel and a guide wire channel for installing the flexible endoscope body. The guide wire channel has a guide wire outlet at the front end and is connected to the outlet of the Y-shaped tube at the rear end. The Y-shaped tube is located on the front side of the base and also includes a guide wire inlet and a water inlet. The Y-shaped tube is a three-way tube.

7. The visual catheter kit as described in claim 6, characterized in that, A sealing structure is provided at the rear end of the guidewire inlet. This sealing structure seals the gap between the guidewire and the inner wall of the guidewire inlet. The sealing structure includes a rubber ring disposed on the inner wall of the guidewire inlet, and the diameter of the rubber ring is smaller than the diameter of the guidewire. The sealing structure is an iris structure, which includes an iris base, a blade, and a guide cover. The iris base is fixed to the rear end of the guide wire inlet. The iris base is provided with a sliding groove. One side of the blade is provided with a slider that matches the sliding groove, and the other side is provided with a guide protrusion. One side of the guide cover is provided with a guide hole that matches the guide protrusion.

8. The visual catheter kit as described in claim 7, characterized in that, The guidewire includes a guidewire body and a guidewire tip, the guidewire tip being elastic and having a hemispherical shape.

9. The visual catheter kit as described in claim 8, characterized in that, The visualization catheter kit also includes a urethral dilator, which comprises several hollow dilators with different outer diameters. Each hollow dilator has a guide wire channel inside. Each hollow dilator includes a dilator body and a dilator front end. The angle between the dilator front end and the dilator body is greater than 160 degrees and less than 180 degrees. The outer diameter of the dilator front end increases sequentially from front to back.

10. The visualization catheter kit as described in claim 9, characterized in that, The operation of the visual catheter kit includes: Insert the flexible endoscope body into the endoscope protective sleeve, and then insert the endoscope body and endoscope protective sleeve together into the urinary catheter; The guidewire is inserted into the guidewire inlet and the water inlet is connected to physiological saline for irrigation, respectively. Anesthesia is injected into the urethra to perform urethral surface anesthesia. Then, the catheter, flexible endoscope, and endoscope protective sheath are inserted into the urethra together. The direction of the tip of the flexible endoscope is adjusted by the endoscope lever. Determine if there is urethral stricture: If so, insert the guidewire through the guidewire channel in the protective sleeve to overcome the narrowing. Directly insert the catheter along the guidewire with force. Once the narrowing is overcome, inject saline solution into the balloon. Then withdraw the flexible endoscope, protective sleeve, and guidewire. Connect the catheter to a urine bag. If the narrowing is not overcome, withdraw the catheter, flexible endoscope, and protective sleeve. Insert the flexible endoscope and protective sleeve together into the urethra until the tip of the flexible endoscope and protective sleeve enters the bladder. Confirm the guidewire is fully inside the bladder using the display screen. Then, keep the guidewire in place and withdraw the endoscope and protective sleeve along the guidewire. Use a urethral dilator to gradually dilate the urethra to the target size. Insert the catheter along the guidewire into the urethra until the tip of the catheter enters the bladder. Inject saline solution into the balloon. Then withdraw the flexible endoscope, protective sleeve, and guidewire. Connect the catheter to a urine bag. Otherwise, insert the urinary catheter into the urethra using the flexible endoscope and endoscope sheath together until the tip of the catheter enters the bladder. Inject saline into the balloon, then withdraw the flexible endoscope, endoscope sheath, and guidewire. Connect the urinary catheter to a urine bag.

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