Painless aseptic urinary catheterization kit

Abstract

This invention relates to the technical field of urinary catheterization kits, and discloses a painless sterile urinary catheterization kit, including a urinary catheter with a urination channel at its center, a through groove at the front end of the catheter, an arc-shaped contact for insertion into the patient's bladder at the front end, an air balloon at the front end of the catheter, a fluid inlet channel communicating with the air balloon inside the catheter, and a super-slippery coating on the surface of the catheter. The catheter also has a flow path inside, through which sterile water is injected into the surface of the catheter to moisten the super-slippery coating. This device actively lubricates the catheter by draining sterile water from the air balloon to the surface of the catheter, effectively solving the problem of dry friction caused by lubrication failure during catheter removal, thereby significantly reducing patient pain and the risk of urethral injury.

Description

Technical Field

[0001] This invention relates to the technical field of urinary catheterization kits, and more particularly to a painless sterile urinary catheterization kit. Background Technology

[0002] With the rapid development of the biomedical engineering industry, the design of medical devices is increasingly focusing on the combination of clinical efficacy and patient experience. Urinary catheterization, as one of the most common nursing procedures in clinical medicine, is widely used for urinary retention, surgical anesthesia, and urine drainage monitoring in critically ill patients.

[0003] In current clinical nursing practice, a standard sterile catheterization kit is equipped with a catheter, which typically consists of a catheter body, a balloon at the tip, and a corresponding water injection valve. The standard operating procedure is as follows: the tip of the catheter is inserted into the patient's bladder, and sterile water is injected into the balloon through the water injection valve to inflate it, thereby securing the tip of the catheter to the bladder neck and preventing slippage.

[0004] However, existing technologies still have significant drawbacks in practical applications: because urinary catheters need to be left in the patient's body for extended periods, the lubricating coating on the catheter surface (such as silicone oil or the factory-installed hydrophilic coating) gradually washes away and dries out due to urine rinsing or absorption by body temperature over time. When medical staff need to remove the catheter, they usually first aspirate the sterile water from the balloon and then pull the catheter out of the urethra. At this point, the catheter and the patient's urethral mucosa have lost their lubricating medium, resulting in poor lubrication and direct "dry friction" contact. This is especially problematic for male patients with complex urethral anatomy, as the urethra is long and has physiological curves. The folds formed by the deflated balloon further increase the frictional resistance during catheter removal. This intense friction not only causes unbearable pain for the patient and can easily lead to urethral mucosal congestion, edema, and even tearing and bleeding, but also increases the risk of urinary tract infections. Summary of the Invention

[0005] Given that existing technologies have problems such as the lubricating coating of the catheter body being easily lost or dried out after long-term indwelling, resulting in dry friction between the catheter body and the urethral mucosa during catheter removal, which causes severe pain to patients and is prone to damage to the urethral mucosa, a painless sterile catheterization kit is proposed.

[0006] This application provides a painless sterile urinary catheterization kit, the purpose of which is to actively re-lubricate the surface of the urinary catheter by draining sterile water from the balloon to the surface of the catheter, effectively solving the problem of dry friction caused by lubrication failure during catheter removal, thereby significantly reducing patient pain and the risk of urethral injury.

[0007] The technical solution of this invention is as follows: a painless sterile urinary catheterization kit, comprising a urinary catheter, a urination channel at the center of the catheter, a through groove at the front end of the catheter, an arc-shaped contact for insertion into the patient's bladder at the front end of the catheter, an air balloon at the front end of the catheter, an inlet channel communicating with the air balloon inside the catheter, and a super-slippery coating on the surface of the catheter body; the catheter also has a flow path channel inside, through which a non-acidic fluid is injected into the surface of the catheter body. The catheter contains a super-slippery coating that moistens the surface of the catheter. The flow path includes an oblique hole inside the catheter and penetrating the catheter wall, an arc-shaped through hole inside the catheter and communicating with the corresponding oblique hole, and an axial through hole inside the catheter and communicating with the corresponding arc-shaped through hole. Multiple oblique holes, arc-shaped through holes, and axial through holes are provided. Two liquid valves are provided on the rear end of the catheter. One liquid valve is connected to the inlet channel, and the other liquid valve is connected to the axial through hole at the rear end.

[0008] Furthermore, multiple oblique holes are evenly distributed along the length of the catheter and staggered in the circumferential direction of the catheter. Each oblique hole is connected to an arc-shaped through hole. The extension direction of the axial through hole is parallel to the axis of the catheter. Multiple axial through holes are connected in series between two adjacent arc-shaped through holes to form an internal flow channel that runs through the length of the catheter. The oblique holes expand outwards towards the outside of the catheter and the diameter of the oblique holes gradually increases in the direction away from the axis of the catheter, forming an outwardly expanding trumpet-shaped opening. A third one-way valve is installed inside the oblique hole.

[0009] Furthermore, the catheter is equipped with an I-shaped tube inside for draining sterile water from inside the balloon to the flow channel inside the flow path; the catheter body has an annular groove, and the annular groove is located inside the balloon.

[0010] Furthermore, the catheter has an internal groove for the I-shaped tube to slide along the axial direction of the catheter, a fluid channel for sterile water to flow through the tube wall, and a docking hole for connecting with the frontmost arc-shaped through hole. The rear outer wall of the I-shaped tube slides and fits against the inner wall of the groove.

[0011] Furthermore, the catheter has an air hole inside that communicates with the inside of the groove, and an installation tube is fixedly connected to the rear end wall of the catheter. A piston is slidably installed inside the installation tube, and a T-shaped push rod is fixedly connected to the side of the piston away from the catheter.

[0012] Furthermore, the outer walls of the mounting tube and the T-shaped push rod are detachably fitted with a plastic sealant.

[0013] Furthermore, a first check valve is installed inside the rear end of the liquid inlet valve.

[0014] Furthermore, it also includes a urine bag body located outside the urinary catheter and a syringe, infusion tube, and urine collection bag located inside the urine bag body. A connecting tube is fixedly connected to the rear end of the urinary catheter, and a second one-way valve is provided inside the rear end of the connecting tube.

[0015] Furthermore, it also includes a pretreatment bag, disposable gloves, sterile cotton balls and clips placed inside the urine bag body, and a sterile water storage bag placed inside the pretreatment bag.

[0016] The beneficial effects of this invention are: 1. By using sterile water pre-injected into the balloon as a lubricant, medical staff do not need to prepare additional lubricating media. The surface of the catheter can be automatically re-lubricated before removal, which effectively solves the problem of the lubricating coating drying out due to long-term catheterization in the urethra. It transforms the originally harmful dry friction into extremely smooth wet lubrication, effectively reducing the risk of urethral mucosal congestion, edema and tearing, and significantly improving the patient's treatment experience and comfort.

[0017] 2. Prioritize lubricating the very tip of the catheter (near the balloon), which is typically the most sensitive and painful area for urethral stricture. As the lubrication progresses, it gradually covers the middle and distal urethra. This deep-to-shallow lubrication sequence perfectly aligns with the biomechanical logic of catheter removal, ensuring the catheter remains under low resistance throughout the withdrawal process.

[0018] 3. The oblique holes in the flow path feature an outward-expanding, funnel-shaped opening design, transforming the lubricating fluid from a jet-like stream to a fan-shaped spread. This not only increases the coverage area of ​​each hole but also reduces the local impact pressure on the urethral mucosa, avoiding discomfort caused by water flow irritation. Combined with the staggered oblique holes, this ensures that sterile water can quickly form a uniform, fully covering film, further helping to loosen adhesions between the catheter and urethral tissue, further reducing catheter removal resistance, making it particularly suitable for patients with complex urethral structures. Attached Figure Description

[0019] Figure 1 This is an overall top view of the present invention; Figure 2 This is a three-dimensional view of the urinary catheter in this invention; Figure 3 This is a schematic diagram of the installation of the flow path channel in this invention; Figure 4 This is a partial cross-sectional view of the urinary catheter in this invention; Figure 5 This is a schematic diagram of the installation of the urination channel in this invention; Figure 6 For the present invention Figure 5 Enlarged view of point A in the middle; Figure 7 For the present invention Figure 5 Enlarged view of point B in the middle; Figure 8 This is a schematic diagram of the internal structure of the urinary catheter in this invention; Figure 9 This is a schematic diagram of the installation of the axial through hole located at the foremost end in this invention; Figure 10 This is a schematic diagram of the installation of the axial through hole located in the middle position in this invention; Figure 11 This is a schematic diagram of the installation of the axial through hole located at the rear end in this invention; Figure 12 This is a perspective view of the I-shaped tube in this invention; Figure 13 This is a schematic diagram of the piston installation in this invention.

[0020] In the picture: 100. Urinary catheter; 101. Syringe; 102. Urine collection bag; 103. Infusion tubing; 104. Pretreatment bag; 105. Sterile water storage bag; 106. Disposable gloves; 107. Sterile cotton balls; 108. Clips; 109. Urine bag body; 110. Urination channel; 111. Arc-shaped contact; 112. Connecting tube; 113. Annular groove; 114. Balloon; 115. Infusion channel; 116. Fluid inlet. Valve; 117. Through groove; 118. First check valve; 119. Second check valve; 200. Flow path channel; 201. Arc-shaped through hole; 202. Axial through hole; 203. Inclined hole; 204. Third check valve; 300. I-shaped tube; 301. Slide groove; 302. Liquid guide groove; 303. Butt joint hole; 304. Air hole; 305. Mounting tube; 306. Piston; 307. T-shaped push rod; 308. Plastic sealing film. Detailed Implementation

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0022] Example 1, referring to Figures 1-13 The first embodiment of the present invention provides: a painless sterile urinary catheterization kit, including a urinary catheter 100, a urination channel 110 at the center of the urinary catheter 100, a through groove 117 at the front end of the urinary catheter 100, an arc-shaped contact 111 for inserting into the patient's bladder at the front end of the urinary catheter 100, an air balloon 114 at the front end of the urinary catheter 100, and an inlet channel 115 communicating with the air balloon 114 inside the urinary catheter 100.

[0023] Specifically, the arc-shaped contact 111 effectively reduces mechanical damage to the urethral mucosa during catheterization, facilitating the insertion of the catheter 100 into the patient's bladder. After the arc-shaped contact 111 is inserted into the patient's bladder, the through groove 117 serves as the inlet for urine to enter the urination channel 110. Sterile water is injected into the balloon 114 through the inlet channel 115, causing the balloon 114 to inflate and thus fix the tip of the catheter 100 inside the bladder, preventing it from slipping out.

[0024] Reference Figures 2-3 The surface of the catheter 100 is coated with an ultra-slippery coating. The catheter 100 also has a flow channel 200 inside, through which sterile water is injected into the surface of the catheter 100 to moisten the ultra-slippery coating.

[0025] Specifically, the super-slippery coating has hydrophilic properties and can be rapidly activated upon contact with water, making the catheter 100 extremely lubricated, thereby significantly reducing the coefficient of friction between the catheter 100 and the patient's urethral wall. This solves the problem in existing technologies where the surface lubricating layer of the catheter 100 dries and fails due to prolonged indwelling time. During catheter removal, the super-slippery coating, combined with the sterile water flowing from the flow channel 200, greatly reduces the resistance during removal, effectively avoiding urethral mucosal tearing and patient pain caused by dry friction, and significantly improving the efficiency of clinical nursing operations and patient comfort. The super-slippery coating refers to a type of hydrophilic polymer coating, specifically materials commonly used in existing technologies such as polyvinylpyrrolidone (PVP) or polyacrylamide (PAM), which can be selected based on actual usage requirements and are not limited here.

[0026] Reference Figures 9-11 The flow path 200 includes an oblique hole 203 formed inside the catheter 100 and penetrating the wall of the catheter 100, an arc-shaped through hole 201 formed inside the catheter 100 and communicating with the corresponding oblique hole 203, and an axial through hole 202 formed inside the catheter 100 and communicating with the corresponding arc-shaped through hole 201. Multiple oblique holes 203, arc-shaped through holes 201, and axial through holes 202 are provided. The multiple oblique holes 203 are evenly distributed along the length of the catheter 100 and staggered in the circumferential direction of the catheter 100. Each oblique hole 203 communicates with an arc-shaped through hole 201.

[0027] Specifically, the multiple oblique holes 203 are arranged in an approximately spiral pattern, allowing the sterile water flowing out to cover the surface of the catheter 100 from multiple angles, effectively avoiding lubrication dead zones caused by fluid discharge from only one direction. It should be noted that the flow path 200 is also provided with two sets, which are symmetrically distributed on both sides of the urination channel 110. Together with the super-slippery coating on the surface of the catheter 100, this further ensures that the sterile water can quickly form a uniform, fully covered water film before catheter removal.

[0028] Reference Figure 4 as well as Figures 9-11 The axial through-hole 202 extends parallel to the axis of the catheter 100, and multiple axial through-holes 202 are connected in series between two adjacent arc-shaped through-holes 201 to form an internal flow channel that runs through the length of the catheter 100. The oblique hole 203 expands outward in the direction of the catheter 100, and the diameter of the oblique hole 203 gradually increases in the direction away from the axis of the catheter 100, forming an outwardly expanding trumpet-shaped opening. A third one-way valve 204 is provided inside the oblique hole 203.

[0029] Specifically, the expanding outlet structure of the oblique orifice 203 transforms the outflowing sterile water from a jet-like stream to a fan-shaped spread, significantly increasing the coverage area of ​​single-orifice lubrication, reducing the local impact pressure of the water flow on the urethral mucosa, and improving comfort. In this embodiment, the third one-way valve 204 is preferably a one-way opening flap. During normal indwelling of the catheter 100, the third one-way valve 204 is closed, effectively blocking the path of bacteria in the urethra to retrogradely enter the catheter 100, preventing cross-infection. When catheter removal is required, the pressure in the flow channel 200 increases, and the third one-way valve 204 opens under pressure, allowing sterile water to flow out smoothly, achieving controllability and safety in the lubrication process.

[0030] Reference Figures 2-8 The catheter 100 has two fluid inlet valves 116 installed on its rear end. One fluid inlet valve 116 is connected to the fluid inlet channel 115, and the other fluid inlet valve 116 is connected to the axial through hole 202 located at the rear end. A first check valve 118 is installed inside the rear end of the fluid inlet valve 116.

[0031] Specifically, one of the inlet valves 116 is connected to the inlet channel 115 and is specifically used to inject sterile water into the balloon 114 to fix the front end of the catheter 100. The other inlet valve 116 is connected to the axial through hole 202 located at the rear end, serving as the injection or discharge port of the flow channel 200, responsible for introducing or discharging sterile water before catheter removal. In this embodiment, the first one-way valve 118 is preferably a one-way opening flap, which has excellent sealing performance. It not only prevents the sterile water injected into the body from flowing back and leaking out, ensuring the stability of the inflation pressure of the balloon 114 and the lubrication pressure in the flow channel 200, but also effectively blocks external bacteria from entering the catheter 100 through the valve, greatly reducing the risk of retrograde infection.

[0032] Reference Figure 1 as well as Figure 7 The painless sterile urinary catheterization kit also includes a urine bag body 109 disposed outside the urinary catheter 100 and a syringe 101, an infusion tube 103 and a urine collection bag 102 disposed inside the urine bag body 109. A connecting tube 112 is fixedly connected to the rear end of the urinary catheter 100, and a second one-way valve 119 is disposed inside the rear end of the connecting tube 112.

[0033] Specifically, the urine bag body 109 provides a clean storage environment for its internal instruments. The urine bag body 109 is equipped with a syringe 101, an infusion tube 103, and a urine collection bag 102. The syringe 101 is used to draw sterile water and inject it through the infusion valve 116. The infusion tube 103 is used to connect the urine collection bag 102 and the connecting tube 112 to form a fluid passage. The urine collection bag 102 is used to collect the drained urine.

[0034] The connecting tube 112 is equipped with a second one-way valve 119. In this embodiment, the second one-way valve 119 is preferably a one-way opening diaphragm flap, which ensures that urine can only flow from the urination channel 110 to the urine collection bag 102 in one direction. This effectively prevents the urine accumulated in the urine collection bag 102 from flowing back into the bladder, further ensuring the safety of the patient's urinary system and avoiding secondary infections caused by urine reflux.

[0035] Reference Figure 1 The painless sterile urinary catheterization kit also includes a pretreatment bag 104, disposable gloves 106, sterile cotton balls 107 and clips 108 disposed inside the urinary bag body 109, and a sterile water storage bag 105 disposed inside the pretreatment bag 104.

[0036] Specifically, to meet the requirements of aseptic standardization and convenience in clinical nursing procedures, the painless sterile urinary catheterization kit also includes a pretreatment bag 104, disposable gloves 106, sterile cotton balls 107, clips 108, and non-woven fabric, all housed inside the catheter bag body 109. The pretreatment bag 104, as an independent packaging unit, also contains a sterile water storage bag 105, allowing medical staff to moisten the catheter 100 with sterile water before insertion. The disposable gloves 106 provide necessary isolation and protection for medical staff, ensuring occupational safety and preventing contamination of the catheter 100 and the patient's urethra by exogenous bacteria. The sterile cotton balls 107 are used to thoroughly disinfect and clean the patient's perineum and urethral opening before insertion, reducing the risk of skin surface bacteria entering the urinary tract. The clip 108 is designed to temporarily close the urination channel 110 after the catheter 100 is inserted into place, to prevent urine from flowing out on its own before the urine collection bag 102 is connected, which could cause contamination or dampness to the sheets.

[0037] Example 2, refer to Figures 1-13 This is the second embodiment of the present invention, which differs from the first embodiment in that: the catheter 100 is further provided with an I-shaped tube 300 for draining sterile water inside the balloon 114 to the flow channel 200. The catheter 100 has an annular groove 113 in its body, and the annular groove 113 is located inside the balloon 114.

[0038] Specifically, through the I-shaped tube 300, the sterile water originally used for fixation before catheter removal can be reused and converted into a lubricating medium. This achieves self-lubrication of the catheter 100 without the need for external injection, greatly simplifying the operation and saving medical resources. When catheter removal is required, the balloon 114 contracts, and the sterile water inside it gathers at the annular groove 113, making it a collection chamber for the outflow of sterile water.

[0039] Reference Figure 6 as well as Figure 12 The catheter 100 has a groove 301 inside for the I-shaped tube 300 to slide along the axial direction of the catheter 100. The tube wall of the I-shaped tube 300 has a liquid guiding groove 302 for the flow of sterile water. The tube wall of the I-shaped tube 300 also has a docking hole 303 for docking with the frontmost arc-shaped through hole 201. The rear outer wall of the I-shaped tube 300 slides and fits against the inner wall of the groove 301.

[0040] Specifically, when tube removal is required, the I-shaped tube 300 is slid towards the annular groove 113, aligning the docking hole 303 with the frontmost arc-shaped through hole 201. The sterile water from the annular groove 113 is then introduced into the docking hole 303 via the liquid guide groove 302 and finally flows into the frontmost arc-shaped through hole 201, thus establishing a complete lubrication path for the sterile water to flow from the balloon 114 through the I-shaped tube 300 to the surface of the catheter 100. It should be noted that a guide strip (not shown in the figure) is fixedly connected to the bottom of the I-shaped tube 300, and a slide rail is provided on the inner wall of the groove 301 for the guide strip to slide on. The cooperation between the guide strip and the slide rail ensures that the I-shaped tube 300 slides only in a straight line without rotation, guaranteeing the stability of the device during use.

[0041] Reference Figure 6 as well as Figure 13 The catheter 100 has an air hole 304 that communicates with the interior of the groove 301. An installation tube 305 is fixedly connected to the rear end wall of the catheter 100. A piston 306 is slidably installed inside the installation tube 305. A T-shaped push rod 307 is fixedly connected to the side of the piston 306 away from the catheter 100. A plastic sealing film 308 is detachably installed on the outer wall of the installation tube 305 and the T-shaped push rod 307.

[0042] Specifically, medical staff push the T-shaped push rod 307, causing the piston 306 to slide within the mounting tube 305. The movement of the piston 306 alters the volume and pressure within the mounting tube 305 and the air hole 304, thereby achieving precise displacement of the I-shaped tube 300. The ergonomic design of the T-shaped push rod 307 facilitates finger application by medical staff, providing excellent tactile feedback and control precision, ensuring the smooth and reliable drainage of sterile water from the airbag 114 to the flow channel 200.

[0043] The surface of the sealing film 308 is provided with a pre-made easy-tear opening. Before the catheter removal operation begins, medical staff can manually remove the sealing film 308 through the easy-tear opening to remove it. When the sealing film 308 is not removed, it fixes the T-shaped push rod 307 relative to the installation tube 305, preventing the piston 306 from moving due to accidental contact during the insertion and indwelling of the urinary catheter 100.

[0044] The remaining structure is the same as that in Example 1.

[0045] Working principle: First, during the intubation preparation phase, medical staff open the urine bag 109, put on disposable gloves 106, and perform routine disinfection and draping using sterile cotton balls 107 to create a sterile operating environment. Then, the catheter 100 is removed, and the super-slippery coating on the surface of the catheter 100 is pre-wetted with sterile water from the sterile water storage bag 105 inside the pretreatment bag 104, activating its super-slippery properties. Guided by the arc-shaped contact 111, the catheter 100 is gently inserted into the patient's bladder. Urine flows through the channel 117 into the urination channel 110 and out through the connecting tube 112, indicating successful intubation. Then, the rear end of the connecting tube 112 is connected to the urine collection bag 102 for urine collection. The second one-way valve 119 inside the bag ensures that urine flows in only one direction, preventing reflux and infection. At this time, medical staff connect one of the infusion valves 116 to the syringe 101, inject sterile water into the balloon 114 through the infusion channel 115 to make it inflate, and fix the front end of the catheter 100 to the bladder neck to prevent slippage.

[0046] Secondly, during indwelling, the super-slippery coating on the surface of the catheter 100 gradually dries due to urine flushing or body heat absorption. At this time, the lubrication system formed by the flow channel 200 and the I-shaped tube 300 is closed, and the third one-way valve 204 inside the oblique hole 203 is tightly closed, effectively blocking the path for bacteria in the urethra to enter the catheter 100 retrogradely, preventing cross-infection. At the same time, the plastic sealing film 308 on the outer wall of the installation tube 305 and the T-shaped push rod 307 remains intact, fixing the T-shaped push rod 307 relative to the installation tube 305, preventing the piston 306 from moving due to accidental contact, and ensuring safety and stability during indwelling.

[0047] Finally, during the extubation procedure, medical staff first remove the plastic seal 308, then push the T-shaped push rod 307, causing the piston 306 to slide within the installation tube 305. The resulting pressure change is transmitted through the air hole 304 to the inside of the slide groove 301, driving the I-shaped tube 300 to slide axially. After the I-shaped tube 300 slides to the predetermined position, its liquid guide groove 302 connects with the annular groove 113 located inside the airbag 114, while the docking hole 303 is precisely aligned with the frontmost arc-shaped through hole 201. At this time, the airbag 114 deflates and contracts, and the sterile water originally used for fixation inside it is collected in the annular groove 113 under pressure or gravity, and flows sequentially into the internal flow channel of the flow path 200 through the liquid guide groove 302 and the docking hole 303. Under pressure, the sterile water flows through the axial through hole 202 and is distributed sequentially from front to back to each arc-shaped through hole 201, finally reaching the inclined hole 203 from front to back and opening the third one-way valve 204. Because the oblique hole 203 has an outward-expanding funnel-shaped opening, the outflowing sterile water spreads in a fan shape, fully moisturizing and activating the dried super-slippery coating on the surface of the catheter 100, and quickly rebuilding the lubricating water film between the catheter body and the urethral mucosa, greatly reducing the resistance to catheter removal, thereby achieving painless and minimally invasive catheter removal.

[0048] It should be noted that this device prioritizes lubricating the very tip of the catheter 100 (near the balloon 114), which is typically the most sensitive area for urethral stricture and pain. As the lubrication progresses backward, the lubrication area successively covers the middle and distal urethra. This deep-to-shallow lubrication sequence perfectly aligns with the biomechanical logic of catheter removal, ensuring that the catheter 100 remains in a low-resistance state throughout the withdrawal phase.

[0049] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A painless sterile urinary catheterization kit, comprising a urinary catheter (100), wherein a urination channel (110) is provided at the center of the urinary catheter (100), a through groove (117) is provided at the front end of the urinary catheter (100), an arc-shaped contact (111) for insertion into the patient's bladder is provided at the front end of the urinary catheter (100), and an air balloon (114) is also provided at the front end of the urinary catheter (100), wherein an inlet channel (115) communicating with the air balloon (114) is provided inside the urinary catheter (100), characterized in that, The surface of the catheter (100) is coated with an ultra-slippery coating; The catheter (100) is also provided with a flow channel (200) inside, through which sterile water is injected into the surface of the catheter (100) to moisten the super-slippery coating on the surface of the catheter (100); The flow path channel (200) includes an oblique hole (203) opened inside the catheter (100) and penetrating the wall of the catheter (100), an arc-shaped through hole (201) opened inside the catheter (100) and communicating with the corresponding oblique hole (203), and an axial through hole (202) opened inside the catheter (100) and communicating with the corresponding arc-shaped through hole (201), and multiple oblique holes (203), arc-shaped through holes (201) and axial through holes (202) are provided; The catheter (100) has two liquid inlet valves (116) on its rear end. One of the liquid inlet valves (116) is connected to the inlet channel (115), and the other liquid inlet valve (116) is connected to the axial through hole (202) at the rear end.

2. The painless sterile urinary catheterization kit according to claim 1, characterized in that: Multiple oblique holes (203) are distributed at equal intervals along the length of the catheter (100) and are staggered in the circumferential direction of the catheter (100). Each oblique hole (203) is connected to an arc-shaped through hole (201). The extension direction of the axial through hole (202) is parallel to the axis of the catheter (100), and multiple axial through holes (202) are connected in series between two adjacent arc-shaped through holes (201) to form an internal flow channel that runs through the length of the catheter (100). The oblique hole (203) expands outward in the direction of the outer side of the catheter (100), and the diameter of the oblique hole (203) gradually increases in the direction away from the axis of the catheter (100), forming an outwardly expanding trumpet-shaped opening. A third one-way valve (204) is provided inside the oblique hole (203).

3. The painless sterile urinary catheterization kit according to claim 1, characterized in that: The catheter (100) is also provided with an I-shaped tube (300) for draining sterile water inside the balloon (114) to the flow channel (200). The catheter (100) has an annular groove (113) in its tube body, and the annular groove (113) is located inside the balloon (114).

4. The painless sterile urinary catheterization kit according to claim 3, characterized in that: The catheter (100) has a groove (301) inside for the I-shaped tube (300) to slide along the axial direction of the catheter (100). The wall of the I-shaped tube (300) has a liquid guide groove (302) for the flow of sterile water. The wall of the I-shaped tube (300) also has a docking hole (303) for docking with the frontmost arc-shaped through hole (201). The outer wall of the rear end of the I-shaped tube (300) slides and fits against the inner wall of the groove (301).

5. The painless sterile urinary catheterization kit according to claim 4, characterized in that: The catheter (100) has an air hole (304) inside that communicates with the inside of the groove (301). An installation tube (305) is fixedly connected to the rear end wall of the catheter (100). A piston (306) is slidably installed inside the installation tube (305). A T-shaped push rod (307) is fixedly connected to the side of the piston (306) away from the catheter (100).

6. The painless sterile urinary catheterization kit according to claim 5, characterized in that: The outer walls of the mounting tube (305) and the T-shaped push rod (307) are detachably fitted with a plastic sealing film (308).

7. The painless sterile urinary catheterization kit according to claim 1, characterized in that: The liquid inlet valve (116) has a first check valve (118) inside its rear end.

8. The painless sterile urinary catheterization kit according to claim 1, characterized in that: It also includes a urine bag body (109) disposed outside the urinary catheter (100) and a syringe (101), an infusion tube (103) and a urine collection bag (102) disposed inside the urine bag body (109). A connecting tube (112) is fixedly connected to the rear end of the urinary catheter (100), and a second one-way valve (119) is disposed inside the rear end of the connecting tube (112).

9. The painless sterile urinary catheterization kit according to claim 8, characterized in that: It also includes a pretreatment bag (104), disposable gloves (106), sterile cotton balls (107) and clips (108) disposed inside the urine bag body (109), and a sterile water storage bag (105) disposed inside the pretreatment bag (104).

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