Urethra administration device for urinary surgery

Abstract

The urethra dosing device comprises an elastic flow guide pipe, a dosing cylinder is fixedly installed on one side of the elastic flow guide pipe, a fixed grip is fixedly connected to the bottom of the outer surface of the dosing cylinder, a dosing pipe opening is formed in the edge of one side of the upper surface of the dosing cylinder, and a liquid suction hole is formed in the middle of one side of the inner wall of the elastic flow guide pipe in a penetrating mode. A plurality of dosing holes are axially formed in the elastic flow guide pipe along the outer surface of the liquid suction hole, a dosing mechanism is arranged on the edge of the outer surface of the elastic flow guide pipe and used for adding medicine to a dosing part in the urethra, and the liquid suction hole and the dosing holes are integrated through the elastic flow guide pipe and matched with the collecting tank and the driving part to achieve hydrops suction. And the liquid suction and the medicine feeding can be completed without replacing the pipeline and inserting the pipe once, so that the repeated stimulation on the urethra of a patient is reduced, the discomfort of the patient is reduced, the secondary infection risk caused by replacing the pipeline is avoided, and compared with the prior art, the use efficiency is improved.

Description

Technical Field

[0001] This invention relates to urological techniques, and more specifically to a urological urethral drug delivery device. Background Technology

[0002] Urology is a medical specialty that focuses on the diagnosis and treatment of diseases of the urinary system (including the kidneys, ureters, bladder, and urethra) and the male reproductive system. As a key passage of the urinary system, the urethra is prone to lesions due to infection, injury, and inflammation. In clinical treatment, targeted therapy is often achieved through local drug delivery to reduce the side effects of systemic medication and increase the drug concentration at the lesion site. Urethral drug delivery devices are commonly used medical devices in urological clinics. Their core function is to accurately deliver liquid or gel-like drugs to the lesion area inside the urethra. They are suitable for scenarios such as urethritis, postoperative care of urethral stricture, and urethral mucosal repair. With their convenient operation and strong targeting, they have become an important tool for local urethral treatment.

[0003] However, in the treatment of urinary tract infections in urology, patients often accumulate infectious fluid (such as inflammatory exudate, pus, etc.) in their urethra. Direct administration of medication to this fluid dilutes the drug concentration and reduces its effectiveness. Therefore, it is necessary to thoroughly aspirate the infectious fluid before administering medication. Currently, in clinical practice, fluid aspiration and urethral medication administration require two separate sets of equipment. Medical staff must first insert an aspiration tubing (such as a syringe connected to an aspiration tube) into the patient's urethra to aspirate the infectious fluid, remove the tubing, and then insert a dedicated medication tubing into the urethra to administer the medication. However, this two-step process... Inserting a tube into the urethra repeatedly irritates the urethral mucosa, causing patients persistent stinging, a feeling of pressure, and other discomfort. This discomfort is particularly intense for patients with severe urethritis or fragile mucosa. Furthermore, during tube replacement, the urethral environment is temporarily exposed to the outside world, and the switching between different tubes may introduce contaminants such as bacteria from the skin surface and the environment, increasing the risk of secondary urethral infection and thus delaying the patient's recovery. At the same time, the step-by-step procedure prolongs the treatment time for individual patients, increases the operational complexity for medical staff, and significantly reduces the overall practicality and efficiency of urethral drug delivery devices. Summary of the Invention

[0004] The purpose of this invention is to provide a urinary tract drug delivery device for urological surgery, in order to solve the problems in the prior art of urinary tract infection treatment, such as the need for separate operations of fluid aspiration and drug delivery, two intubations causing patient discomfort, easy to cause secondary infection, and low efficiency.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a urethral drug delivery device for urology, comprising an elastic guide tube, a drug delivery cylinder fixedly installed on one side of the elastic guide tube, a fixed handle fixedly connected to the bottom of the outer surface of the drug delivery cylinder, a drug inlet opened on one side of the upper surface of the drug delivery cylinder, a liquid suction hole opened through the middle of one side of the inner wall of the elastic guide tube, a plurality of drug delivery holes axially opened along the outer surface of the liquid suction hole inside the elastic guide tube, and a drug delivery mechanism provided on the outer surface edge of the elastic guide tube for adding drugs to the drug delivery site inside the urethra;

[0006] The drug delivery mechanism includes fixing holes, which are arranged side by side on one side of the inner wall of the drug delivery hole. Multiple fixing holes arranged circumferentially form a group. A support balloon is fixedly attached to the outer surface of the elastic guide tube outside the single group of fixing holes. An inner balloon is fixedly installed between two support balloons. A fixing groove is provided on one side of the outer surface of the inner balloon. Several drug delivery heads are provided inside the fixing groove. Several pressure diaphragms are provided at the junction of the support balloon and the inner balloon.

[0007] An external extension tube is fixedly installed on one side of the inner wall of the suction hole to the outside of the elastic guide tube. A collection tank is provided at one end of the external extension tube. A driving part is fixedly installed at the bottom of the collection tank. A connection port is provided between the collection tank and the driving part.

[0008] The drug delivery cartridge is also equipped with a drug-pushing component, which is used to push the drug into the patient's urethra along multiple drug delivery holes.

[0009] Furthermore, the drug delivery assembly includes a movable push rod, which is movably disposed on one side of the drug delivery cylinder. A connecting handle is fixedly installed on one side of the movable push rod outside the drug delivery cylinder, and a piston is fixedly connected to the other side of the movable push rod inside the drug delivery cylinder.

[0010] Furthermore, a through hole is provided on one side of the drug delivery cylinder, and one side of the outer surface of the movable push rod is located in the through hole, with the movable push rod and the through hole fitting together.

[0011] Furthermore, a threaded fitting is fixedly connected to one end of the outer extension tube, and a fixing sleeve is fixedly installed at the opening on the upper surface of the collection tank. The outer surface of the fixing sleeve is provided with external threads, and the fixing sleeve is threadedly connected inside the threaded fitting. The threaded fitting and the fixing sleeve are coupled to each other.

[0012] Furthermore, a number of support rods are fixedly connected to one end of the elastic guide tube, a pressure sensor is fixedly installed at one end of the support rod, and a sensor light is provided on the front end face of the fixed handle.

[0013] Furthermore, a sealing plug is installed at the top opening of the dosing tube, with one end of the sealing plug located inside the dosing tube, and the dosing tube and the sealing plug engaging with each other.

[0014] Furthermore, the outer diameter of the supporting balloon in its inflated state is larger than the outer diameter of the inner balloon in its inflated state.

[0015] Furthermore, a plurality of connecting holes are provided between the supporting balloon and the inner balloon, and the pressure diaphragm is located in the middle position inside the connecting holes.

[0016] Compared with the prior art, the urinary tract drug delivery device provided by the present invention has the following beneficial effects:

[0017] 1. This invention integrates a suction port and a drug delivery port through an elastic guide tube, and uses a collection tank and a drive unit to aspirate accumulated liquid. The drug delivery mechanism then delivers the medication, eliminating the need to replace the tubing. The suction and drug delivery operations can be completed with a single insertion of the tube, reducing repeated irritation to the patient's urethra, alleviating patient discomfort, and avoiding the risk of secondary infection caused by tubing replacement. Compared with existing technologies, this invention improves efficiency.

[0018] 2. This invention creates a drug delivery space by inflating a support balloon to support the urethra. The pressure diaphragm ruptures after the drug pressure reaches the target level, allowing the drug to enter the inner balloon and be evenly sprayed through the drug delivery head, achieving targeted and precise drug delivery, ensuring that the drug fully contacts the lesion, and improving the treatment effect.

[0019] 3. This invention, through the linkage design of pressure sensor and sensor light, can monitor the contact pressure when the elastic guide tube is inserted in real time, avoid excessive insertion and damage to the urethral mucosa, effectively protect the patient, and improve the safety of the device.

[0020] 4. The outer extension tube and the collection tank of the present invention are detachably connected by a threaded fitting and a fixing sleeve. The collection tank is easy to disassemble, clean and replace. The sealing plug of the administration cartridge can prevent drug contamination, thus improving the hygiene and practicality of the equipment. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0022] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the collection tank structure provided in an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the cross-sectional structure of the elastic guide tube provided in an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the connection port structure provided in an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the fixed sleeve structure provided in an embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of the supporting balloon structure provided in an embodiment of the present invention;

[0028] Figure 7 Provided for embodiments of the present invention Figure 3 A magnified schematic diagram of part A in the diagram.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Elastic guide tube; 2. Dosing cartridge; 3. Fixed handle; 4. Suction hole; 5. Dosing port; 6. Dosing inlet; 7. Fixing hole; 8. Support balloon; 9. Inner balloon; 10. Fixing groove; 11. Dosing head; 12. Pressure diaphragm; 13. Movable push rod; 14. Connecting handle; 15. Piston; 16. Outer extension tube; 17. Threaded fitting; 18. Collection container; 19. Fixed sleeve; 20. Drive unit; 21. Connection port; 22. Support rod; 23. Pressure sensor; 24. Induction light; 25. Sealing plug. Detailed Implementation

[0031] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0032] As attached Figure 1 To be continued Figure 7 As shown:

[0033] Example 1:

[0034] This invention provides a urethral drug delivery device for urology, comprising an elastic guide tube 1, a drug delivery cylinder 2 fixedly installed on one side of the elastic guide tube 1, a fixed handle 3 fixedly connected to the bottom of the outer surface of the drug delivery cylinder 2, a drug delivery port 6 opened on one side of the upper surface of the drug delivery cylinder 2, a sealing plug 25 installed at the top opening of the drug delivery port 6, one end of the sealing plug 25 being located inside the drug delivery port 6, the drug delivery port 6 and the sealing plug 25 engaging with each other, a liquid suction hole 4 penetrating through the middle of one side of the inner wall of the elastic guide tube 1, a plurality of drug delivery holes 5 axially opened along the outer surface of the liquid suction hole 4 inside the elastic guide tube 1, and a drug delivery mechanism provided on the outer surface edge of the elastic guide tube 1 for adding drugs to the drug delivery site inside the urethra;

[0035] The drug delivery mechanism includes a fixing hole 7, which is arranged in parallel on one side of the inner wall of the drug delivery hole 5. Multiple fixing holes 7 arranged in a circle form a group. A support balloon 8 is fixedly attached to the outer surface of the elastic guide tube 1 outside the single group of fixing holes 7. An inner balloon 9 is fixedly installed between two support balloons 8. A fixing groove 10 is opened on one side of the outer surface of the inner balloon 9. Several drug delivery heads 11 are arranged inside the fixing groove 10. Several pressure diaphragms 12 are arranged at the junction of the support balloon 8 and the inner balloon 9.

[0036] The outer diameter of the support balloon 8 when inflated is larger than the outer diameter of the inner balloon 9 when inflated.

[0037] Several connecting holes are provided between the support balloon 8 and the inner balloon 9, and the pressure diaphragm 12 is located in the middle of the connecting holes;

[0038] An external extension tube 16 is fixedly installed on one side of the inner wall of the suction hole 4 to the outside of the elastic guide tube 1. A collection tank 18 is provided at one end of the external extension tube 16. A drive unit 20 is fixedly installed at the bottom of the collection tank 18. The drive unit 20 is a micro suction pump. A connection port 21 is provided between the collection tank 18 and the drive unit 20.

[0039] A threaded fitting 17 is fixedly connected to one end of the outer extension tube 16. A fixed sleeve 19 is fixedly installed at the opening on the upper surface of the collection tank 18. An external thread is provided on the outer surface of the fixed sleeve 19. The fixed sleeve 19 is threadedly connected to the inside of the threaded fitting 17. The threaded fitting 17 and the fixed sleeve 19 are coupled to each other.

[0040] The drug delivery cartridge 2 is also equipped with a drug delivery component, which is used to push the drug into the patient's urethra along multiple drug delivery holes 5.

[0041] Working principle: First, before operation, the staff checks the status of each component of the equipment: confirm that the elastic guide tube 1 is undamaged, the support balloon 8 and the inner balloon 9 are leak-free, the pressure diaphragm 12 is intact and unbroken, the threaded assembly 17 is threadedly matched with the fixed sleeve 19, the drive unit 20 is running normally, and the sealing plug 25 is tightly engaged with the dosing port 6.

[0042] Next, the staff aligned the fixing sleeve 19 on the upper surface of the collection tank 18 with the threaded fitting 17 at the end of the outer extension tube 16, and rotated the collection tank 18 clockwise to make the fixing sleeve 19 and the threaded fitting 17 threadedly connected and fixed, ensuring that the connection was sealed and leak-free; then, the sealing plug 25 of the drug delivery port 6 was pulled out, and the prepared therapeutic drug was slowly injected into the drug delivery cartridge 2. After the injection was completed, the sealing plug 25 was re-inserted into the drug delivery port 6 to prevent drug contamination or leakage.

[0043] Then, the staff member holds the fixed handle 3 and slowly inserts the end of the elastic drainage tube 1 into the patient's urethra, keeping the movement gentle to avoid excessive stimulation of the urethral mucosa; when the elastic drainage tube 1 is inserted to the vicinity of the preset lesion area, the insertion operation is stopped to ensure that the suction hole 4 can effectively cover the fluid accumulation area, and the drug delivery device is aligned with the drug delivery site.

[0044] Subsequently, the staff activated the drive unit 20, which provided negative pressure suction to the inside of the collection tank 18 through the connection port 21. The infected fluid in the patient's urethra was sucked into the suction hole 4 under the negative pressure. The fluid flowed along the channel of the suction hole 4 to the external extension tube 16, and then was transported to the collection tank 18 for storage through the external extension tube 16. The staff observed the amount of fluid in the collection tank 18, and after the fluid was completely suctioned out, the drive unit 20 was turned off.

[0045] Next, the staff prepares to administer the medication: holding the connecting handle 14, they slowly push the movable push rod 13 towards the medication cylinder 2. The movable push rod 13 drives the piston 15 to move smoothly inside the medication cylinder 2. The piston 15 squeezes the medication inside the cylinder, creating a stable pressure. Under the pressure, the medication enters several medication holes 5 in the elastic guide tube 1 and flows along the channels of the medication holes 5 to the fixed hole 7, and is finally injected into the support balloon 8 through the fixed hole 7.

[0046] As the drug is continuously injected, the support balloon 8 gradually inflates. Since the outer diameter of the support balloon 8 in the inflated state is larger than that of the inner balloon 9, the support balloon 8 will locally support the patient's urethra, forming an independent and stable drug delivery space, while keeping the inner balloon 9 in a hollow state, providing a channel for subsequent drug diffusion. When the drug pressure inside the support balloon 8 reaches a preset threshold, the pressure diaphragm 12 in the connection hole between the support balloon 8 and the inner balloon 9 ruptures, and the drug flows rapidly into the inner balloon 9 through the connection hole.

[0047] After the inner balloon 9 is inflated, the drug is evenly sprayed out along several drug delivery heads 11 in the fixed groove 10 on its outer surface, accurately covering the drug delivery position inside the patient's urethra, and achieving targeted drug delivery; after the drug delivery is completed, the staff slowly pulls the movable push rod 13 in the opposite direction to reduce the pressure in the drug delivery cylinder 2 and the drug delivery hole 5, and the support balloon 8 and inner balloon 9 gradually contract and return to their original shape.

[0048] Finally, the staff member holds the fixed handle 3 and slowly pulls the elastic drainage tube 1 out of the patient's urethra to complete the entire aspiration and drug administration operation; afterwards, the collection tank 18 can be unscrewed to process the collected fluid and clean and disinfect all parts of the equipment for the next use.

[0049] Example 2:

[0050] This embodiment is basically the same as the previous embodiment, except that the drug delivery assembly includes a movable push rod 13. The movable push rod 13 is movably disposed on one side of the drug delivery cylinder 2. A connecting handle 14 is fixedly installed on one side of the movable push rod 13 outside the drug delivery cylinder 2, and a piston 15 is fixedly connected to the other side of the movable push rod 13 inside the drug delivery cylinder 2.

[0051] One side of the drug delivery cartridge 2 has a through hole, and one side of the outer surface of the movable push rod 13 is located in the through hole, with the movable push rod 13 and the through hole fitting together.

[0052] Working principle: First, before operation, the staff should check the status of the drug pushing component: confirm that the movable push rod 13 and the through hole on one side of the drug delivery cylinder 2 are tightly fitted together, there is no jamming or loosening when the movable push rod 13 is pushed, the piston 15 is undamaged and fits well with the inner wall of the drug delivery cylinder 2, and ensure that there is no drug leakage during the drug pushing process.

[0053] Next, the staff completed the connection of the collection tank 18, drug injection and insertion of the elastic guide tube 1 according to the steps of Example 1. After the accumulated liquid was aspirated, they focused on the drug delivery process.

[0054] Then, the staff member holds the connecting handle 14 with their hand to keep their hand stable and slowly pushes the movable push rod 13 into the drug delivery cylinder 2. Because the movable push rod 13 fits precisely with the through hole, the push rod always remains coaxial during the movement, driving the piston 15 to squeeze the drug at a uniform speed. The drug flows smoothly into the drug delivery hole 5 under uniform pressure, avoiding urethral discomfort caused by pressure fluctuations.

[0055] The drug is injected into the support balloon 8 through the drug delivery port 5 and the fixing port 7. The support balloon 8 gradually inflates and supports the urethra. When the pressure reaches the threshold, the pressure diaphragm 12 ruptures, and the drug flows into the inner balloon 9 and is sprayed through the drug delivery head 11. During the entire drug delivery process, the close fit between the piston 15 and the inner wall of the drug delivery cylinder 2 ensures that there is no drug residue or leakage, and all drugs are used for targeted drug delivery, thereby improving drug utilization.

[0056] After the drug administration is completed, the staff pulls the movable push rod 13 in the opposite direction to reset the piston 15 to the initial position of the drug administration cylinder 2, which supports the balloon 8 and the inner balloon 9 to contract. Then, the elastic guide tube 1 is slowly pulled out to clean the residual drug on the surface of the drug administration assembly and to check the condition of the movable push rod 13 and the piston 15 to ensure that there is no damage.

[0057] Example 3:

[0058] This embodiment is basically the same as the previous embodiment, except that a number of support rods 22 are fixedly connected to one end of the elastic guide tube 1, a pressure sensor 23 is fixedly installed at one end of the support rod 22, and an induction light 24 is provided on the front end of the fixed handle 3.

[0059] Working principle: First, before operation, the staff checks the pressure sensing components: confirm that the support rod 22 is firmly fixed to the end of the elastic guide tube 1, the pressure sensor 23 is installed stably and the signal is normal, the sensor light 24 is linked smoothly with the pressure sensor 23 and can flash normally after power is applied.

[0060] Next, after the staff completes the connection of the collection tank 18 and the drug injection operation, they hold the fixed handle 3 and slowly insert the end of the elastic guide tube 1 into the patient's urethra. At this time, the support rod 22 at the end of the elastic guide tube 1 plays a supporting and buffering role, preventing the pressure sensor 23 from directly contacting the urethral mucosa and reducing discomfort.

[0061] Then, the pressure sensor 23 detects the contact pressure with the urethral mucosa in real time and transmits the pressure signal to the sensor light 24 on the fixed handle 3. When the elastic guide tube 1 encounters a urethral stricture or approaches the lesion area during insertion, causing the contact pressure to rise and reach the preset sensing pressure value, the sensor light 24 immediately starts to flash to warn the staff.

[0062] After the staff sees the sensor light 24 flashing, they immediately stop inserting the elastic drainage tube 1 to avoid excessive insertion that could cause pressure damage to the urethral mucosa; then they start the drive unit 20 to aspirate the infected fluid in the urethra through the suction hole 4. After the fluid is collected in the collection tank 18, the drive unit 20 is turned off.

[0063] Next, the staff pushes the connecting handle 14 to inject the drug into the support balloon 8 through the drug delivery component. The support balloon 8 inflates and supports the urethra. After the pressure reaches the target, the pressure diaphragm 12 ruptures, and the drug is sprayed to the administration site through the drug delivery head 11 of the inner balloon 9. Throughout the drug administration process, the sensor light 24 continuously monitors the pressure. If the pressure rises abnormally, it will flash again to remind the staff to adjust the operation.

[0064] After the medication is administered, the staff pulls the movable push rod 13 in the opposite direction to contract the support balloon 8 and the inner balloon 9, and then slowly pulls the elastic drainage tube 1 out of the patient's urethra; turns off the power of the sensor light 24, checks whether the pressure sensor 23 and the support rod 22 are intact, cleans them and stores the equipment properly.

[0065] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A urological urethral drug delivery device, comprising an elastic drainage tube (1), characterized in that, A drug delivery tube (2) is fixedly installed on one side of the elastic guide tube (1). A fixed handle (3) is fixedly attached to the bottom of the outer surface of the drug delivery tube (2). A drug delivery port (6) is opened on one side of the upper surface of the drug delivery tube (2). A liquid suction hole (4) is opened through the middle of one side of the inner wall of the elastic guide tube (1). Several drug delivery holes (5) are opened axially along the outer surface of the liquid suction hole (4) inside the elastic guide tube (1). A drug delivery mechanism is provided on the outer surface of the elastic guide tube (1) for adding drugs to the drug delivery site inside the urethra. The drug delivery mechanism includes a fixing hole (7), which is opened side by side on one side of the inner wall of the drug delivery hole (5). Multiple fixing holes (7) arranged in a circle form a group. The outer surface of the elastic guide tube (1) is fixedly connected to a support balloon (8) outside the single group of fixing holes (7). An inner balloon (9) is fixedly installed between two support balloons (8). A fixing groove (10) is opened on one side of the outer surface of the inner balloon (9). Several drug delivery heads (11) are arranged inside the fixing groove (10). Several pressure diaphragms (12) are arranged at the junction of the support balloon (8) and the inner balloon (9). An external extension tube (16) is fixedly installed on one side of the inner wall of the suction hole (4) to the outside of the elastic guide tube (1). A collection tank (18) is provided at one end of the external extension tube (16). A driving part (20) is fixedly installed at the bottom of the collection tank (18). A connection port (21) is provided between the collection tank (18) and the driving part (20). The drug delivery tube (2) is also equipped with a drug delivery component inside, which is used to push the drug into the patient's urethra along multiple drug delivery holes (5).

2. The urological urethral drug delivery device according to claim 1, characterized in that, The drug delivery assembly includes a movable push rod (13), which is movably disposed on one side of the drug delivery cylinder (2). A connecting handle (14) is fixedly installed on one side of the movable push rod (13) outside the drug delivery cylinder (2), and a piston (15) is fixedly connected to the other side of the movable push rod (13) inside the drug delivery cylinder (2).

3. A urological urethral drug delivery device according to claim 2, characterized in that, The drug delivery tube (2) has a through hole on one side, and the outer surface of the movable push rod (13) is located in the through hole. The movable push rod (13) and the through hole are fitted together.

4. A urological urethral drug delivery device according to claim 1, characterized in that, One end of the outer extension tube (16) is fixedly connected to a threaded fitting (17), and a fixed sleeve (19) is fixedly installed at the opening on the upper surface of the collection tank (18). The outer surface of the fixed sleeve (19) is provided with an external thread, and the fixed sleeve (19) is threadedly connected inside the threaded fitting (17). The threaded fitting (17) and the fixed sleeve (19) are coupled to each other.

5. A urological urethral drug delivery device according to claim 1, characterized in that, A number of support rods (22) are fixedly connected to one end of the elastic guide tube (1), and a pressure sensor (23) is fixedly installed at one end of the support rod (22). A sensor light (24) is provided on the front end face of the fixed handle (3).

6. A urological urethral drug delivery device according to claim 1, characterized in that, A sealing plug (25) is installed at the top opening of the dosing port (6). One end of the sealing plug (25) is located inside the dosing port (6), and the dosing port (6) and the sealing plug (25) are engaged with each other.

7. A urological urethral drug delivery device according to claim 1, characterized in that, The outer diameter of the support balloon (8) in the inflated state is greater than the outer diameter of the inner balloon (9) in the inflated state.

8. A urological urethral drug delivery device according to claim 1, characterized in that, A plurality of connecting holes are provided between the supporting balloon (8) and the inner balloon (9), and the pressure diaphragm (12) is located in the middle position inside the connecting holes.

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