Urethral stricture medication catheter and use method thereof

Abstract

The invention discloses a urethral stricture drug administration catheter and a use method thereof, comprising a visual urethral stricture balloon dilator and a urethra, wherein a urethral stricture fixing mechanism, a urethral stricture anastomosis limiting mechanism and a drug administration mechanism are arranged on the urethral lumen; the visual urethral stricture balloon dilator is used to dilate the urethral stricture part and guide the urethra to pass through the urethral stricture part smoothly; the urethral fixing mechanism is used to fix the urethra when the urethra is indwelling, the urethral stricture anastomosis limiting mechanism is used to fix the position of the urethral stricture drug administration catheter and the urethral stricture anastomosis relatively, and the drug administration mechanism is used to supply drugs to an adsorption sponge; when in use, 5-fluorouracil combined with glucocorticoid is introduced into the urethral stricture repair wound surface through the urethral stricture drug administration catheter, and the urethral stricture repair wound surface is compressed by the mesh silicone capsule on the surface of the drug administration balloon, which is used for urethral stricture treatment and prevention of scar recurrence, thereby alleviating the pain and economic burden of patients, and having the characteristics of good supporting drug administration effect.

Description

Technical Field

[0001] The invention relates to the technical field of medical and sanitary equipment, and in particular to a urethral stricture medication catheter and a use method thereof. Background Art

[0002] Urethral stricture is a common disease of the male lower urinary tract. Its causes include perineal injury, iatrogenic injury and chronic inflammation. The natural course of urethral stricture usually begins with injury and inflammatory response of the urethral mucosa, followed by abnormal proliferation of extracellular matrix at the site of injury and scar formation, which leads to a reduction in the urethral lumen and dysuria. The difficulty in treating this disease lies in its high recurrence rate of postoperative stricture. Therefore, how to prevent the recurrence of urethral stricture after surgery has become a research focus in the field of lower urinary tract reconstruction. So far, there are still few studies on the prevention of urethral stricture recurrence by drugs, and there is no consensus on its effectiveness and safety, which has led to the insufficient application of this method in clinical practice.

[0003] 5-fluorouracil (5-FU) combined with glucocorticoids is one of the latest advances in scar treatment. In addition, silicone compression can also treat scars. Currently, after urethral stricture surgery, injection of drugs at the anastomosis or spraying of drugs on the surface of the catheter will result in the drug being difficult to retain in the urethra, and the drug cannot continue to soak the anastomosis at a certain concentration for an effective time. In addition, the silicone material on the surface of the catheter cannot exert appropriate pressure on the wound surface of the urethral stricture repair, resulting in scar repair of the anastomosis and recurrence of urethral stricture.

[0004] Therefore, there is an urgent need for a urethral stricture drug delivery catheter to introduce 5-fluorouracil (5-FU) combined with glucocorticoids into the urethral stricture repair wound, and to compress the urethral stricture repair wound with silicone material to treat urethral stricture and prevent scar recurrence. Summary of the invention

[0005] In view of the above-mentioned problems, the present invention aims to provide a urethral stricture drug delivery catheter and a method of using the same. Through the urethral stricture drug delivery catheter, 5-fluorouracil combined with glucocorticoids are introduced into the urethral stricture repair wound, and the mesh silicone membrane on the surface of the drug delivery balloon is used to compress the urethral stricture repair wound. It is used to treat urethral stricture and prevent scar recurrence, thereby ensuring good therapeutic effects, thereby reducing the patient's pain and economic burden, and has the characteristics of good supporting drug delivery effect and simple and convenient use.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] A urethral stricture medication catheter, comprising a urethral stricture medication catheter, a urethral stricture medication catheter, a urethral stricture medication catheter fixing mechanism arranged on the urethral stricture lumen, a urethral stricture anastomosis limiting mechanism, a medication mechanism and a urethral stricture visual balloon dilator;

[0008] The urinary catheter fixing mechanism comprises a urinary catheter air bag, a urinary catheter air bag air inlet pipe and a urinary catheter air bag inlet. The urinary catheter air bag is arranged on the urinary catheter, one end of the urinary catheter air bag air inlet pipe is connected to the urinary catheter air bag, and the other end of the urinary catheter air bag air inlet pipe is provided with a urinary catheter air bag inlet.

[0009] The limiting mechanism at the urethral stricture anastomosis includes a medication airbag, an adsorption sponge, a medication airbag air inlet tube, a medication airbag pressure display and a medication airbag air inlet port. The medication airbag is arranged on the right end outer side of the urethral airbag, the adsorption sponge is arranged on the medication airbag, the urethra contact surface of the adsorption sponge is covered with a medication airbag surface mesh silicone film, one end of the medication airbag air inlet tube is connected to the medication airbag, and the other end of the medication airbag air inlet tube is provided with a medication airbag air inlet port and a pressure display;

[0010] The drug administration mechanism comprises a drug injection tube and a constant pressure perfusion pump, one end of the drug injection tube is connected to the adsorption sponge, and the other end of the drug injection tube is connected to the constant pressure perfusion pump, and the constant pressure perfusion pump is filled with drugs;

[0011] The urethral stricture visual balloon dilator is arranged in the inner cavity of the urethra, and comprises a urethral stricture mirror body, a urethral visual system arranged on the urethral stricture mirror body, and a urethral stricture dilation mechanism and a guiding system arranged in a working channel of the urethral stricture mirror body.

[0012] Preferably, the urinary catheter is in a hollow tubular shape, and a side hole is provided on the side wall of the lumen at the left end of the urinary catheter, and the urinary catheter airbag is provided on the right side of the side hole.

[0013] Preferably, according to the location of the urethral stenosis of the patient, the location of the drug delivery balloon on the urethra includes posterior urethra, anterior urethra and full urethra.

[0014] Preferably, the urethral stricture dilation mechanism includes a stricture dilation airbag and a stricture dilation airbag inlet tube, the stricture dilation airbag is arranged on the outside of the safety guidewire and is connected to one end of the stricture dilation airbag inlet tube, and a stricture dilation pressure display is also provided at the stricture dilation air inlet at the other end of the stricture dilation airbag inlet tube; the guidance system includes a safety guidewire working channel and a safety guidewire, the safety guidewire working channel is arranged in the urethral stricture mirror body, and the safety guidewire is movably connected in the safety guidewire working channel.

[0015] Preferably, the guiding system includes a visible light source optical fiber and a camera data cable, a visible light source is arranged at the end of the visible light source optical fiber, a camera is arranged at the end of the camera data cable, and the other ends of the visible light source optical fiber and the camera data cable are connected to a display screen.

[0016] Preferably, the tube end of the ureteral airbag inlet is provided with a ureteral airbag air inlet valve, the tube end of the medication airbag air inlet is provided with a medication airbag air inlet valve; the tube end of the stenosis expansion airbag air inlet tube is provided with a stenosis expansion airbag air inlet valve.

[0017] Preferably, the urinary catheter described in (1) has an outer diameter of 8 mm, an inner diameter of 5 mm, and a length of 30 cm;

[0018] (2) The drug delivery balloon has a length of 4-8 cm, a maximum outer diameter of 8 mm, and an outer diameter of 10 mm after inflation;

[0019] (3) The thickness of the adsorption sponge is 0.25 cm;

[0020] (4) The outer diameter of the lens of the urethral stricture visual balloon dilator is 5 mm and the length is 70 cm.

[0021] Preferably, convex circles are arranged on both sides of the drug delivery airbag, and a slot is formed between two symmetrically arranged convex circles, and the adsorption sponge is engaged in the slot.

[0022] A method for using a urethral stricture medication catheter, comprising the steps of:

[0023] S1. Determine the location of urethral stricture according to the results of preoperative urethrography, select the corresponding urethral stricture medication catheter model, and ensure that the adsorption sponge covers the urethral stricture anastomosis;

[0024] S2. Before use, pass the urethral stricture visual balloon dilator through the urethral stricture catheter lumen; insert the urethral stricture visual balloon dilator from the urethral orifice, and reach the urethral stricture site under the guidance of the display of the urethral stricture visual balloon dilator, pass the safety guide wire through the urethral stricture site under direct vision, and continue to advance the scope to the bladder under the guidance of the safety guide wire, slowly withdraw the scope to the distal end of the urethral stricture while leaving the safety guide wire, adjust the safety guide wire under direct vision to position the urethral stricture dilation balloon at the urethral stricture site, and use the urethral stricture dilation balloon to dilate the urethral stricture site;

[0025] S3. After successfully dilating the urethral stricture, continue to advance the scope to the bladder, push the urethra along the urethral stricture visual balloon dilator into the bladder, and withdraw the urethral stricture visual balloon dilator;

[0026] S4. Slowly inflate the catheter balloon to 10-15 ml to fix the catheter to prevent it from falling off, connect the drainage bag, and drain the urine;

[0027] S5. Gently pull the catheter outward, then slowly inflate the air inlet of the medication airbag, which will cause the adsorption sponge to expand, and observe the indication on the pressure display;

[0028] S6. When the adsorption sponge is inflated to a suitable contact with the urethral stricture anastomosis, the inflation is stopped, and the pressure of the drug delivery balloon is maintained so that the drug infused on the adsorption sponge can contact with the urethral stricture anastomosis;

[0029] S7. After inflation, 5-10 ml of drug is infused into the adsorption sponge every day through a constant pressure infusion pump, and the urinary catheter is removed after 2-4 weeks of indwelling;

[0030] Wherein: the drug described in step S7 includes a drug for inhibiting scar growth, and the drug for inhibiting scar growth is 5-fluorouracil or glucocorticoid.

[0031] The beneficial effects of the present invention are as follows: the present invention discloses a urethral stricture drug delivery catheter and a method of using the same. Compared with the prior art, the present invention has the following improvements:

[0032] (1) The present invention designs a urethral stricture drug delivery catheter, which includes a urethral stricture expansion mechanism, a catheter fixing mechanism, a urethral stricture anastomotic site limiting mechanism and a drug delivery mechanism. When in use, the urethral stricture site is safely expanded under direct vision, and the drug is continuously added to the adsorption sponge through the drug delivery mechanism. The drug delivery balloon allows the adsorption sponge to continuously retain the 5-fluorouracil combined with glucocorticoid liquid at the anastomosis site to the maximum extent, and at the same time continuously soak the anastomosis site at a certain concentration, which is beneficial to the recovery and healing of the wound.

[0033] (2) At the same time, the mesh silicone membrane covering the contact surface of the adsorbent sponge urethra can continuously apply appropriate pressure to the wound surface of urethral stricture repair, reducing the recurrence of urethral stricture, thereby alleviating the patient's pain and economic burden;

[0034] (3) A visual balloon dilator for urethral stricture is arranged in the urethra. When in use, the urethra 1 is guided into the patient's body by utilizing the guiding system, and the urethra visual system is utilized to observe the stenosis of the patient, so as to accurately locate the position of the urethra guided into the patient's body for subsequent treatment. After the urethral stricture is successfully dilated, the scope is continued to be advanced to reach the bladder, and the urethra is pushed into the bladder along the scope of the visual balloon dilator for urethral stricture, and the visual balloon dilator for urethral stricture is withdrawn. In addition, the urethral stricture drug delivery catheter of the present invention has a simple structure, and most of the structure is made of silicone material, which is low in cost. The silicone material used has the advantages of good flexibility, not easy to age, safety and non-toxicity. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the structure of the urethral stricture drug delivery catheter of the present invention.

[0036] Figure 2 It is a cross-sectional view of the drug-delivery catheter for urethral stricture of the present invention.

[0037] Figure 3 It is a schematic structural diagram of the visual balloon dilator for urethral stricture of the present invention.

[0038] Among them: 1. Urethra, 2. Side hole, 3. Urethra balloon, 4. Urethra balloon air inlet tube, 5. Urethra balloon air inlet valve, 6. Urethra balloon inlet, 7. Drug delivery balloon, 71. Slot, 72. Raised ring, 8. Grid silicone film on the surface of drug delivery balloon, 9. Adsorption sponge, 10. Drug injection tube, 11. Drug delivery balloon air inlet tube, 12. Constant pressure perfusion pump, 13. Drug, 14. Drug delivery balloon pressure display, 15. Drug delivery balloon air inlet Valve, 16. Air inlet of drug delivery balloon, 17. Visible light source, 18. Camera, 19. Stenosis dilation balloon, 20. Air inlet tube of stenosis dilation balloon, 21. Stenosis dilation pressure display, 22. Stenosis dilation air inlet, 23. Stenosis dilation balloon air inlet valve, 24. Display screen, 25. Visible light source optical fiber, 26. Camera data cable, 27. Hydrophilic guidewire working channel, 28. Urethral stenosis mirror body, 29. Hydrophilic guidewire. DETAILED DESCRIPTION

[0039] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0040] Refer to the attached Figure 1-3 A urethral stricture drug-delivery catheter and a method of using the same are shown, wherein the urethral stricture drug-delivery catheter comprises a catheter 1, a catheter fixing mechanism arranged on the lumen of the catheter 1, a limiting mechanism at the anastomotic opening of the urethral stricture, a drug-delivery mechanism, and a urethral stricture visual balloon dilator;

[0041] The urethra fixing mechanism is used to fix the urethra when the urethra 1 is left in place after urethral stenosis surgery. The mechanism specifically comprises a urethra air bag 3, a urethra air bag air inlet tube 4 and a urethra air bag inlet 6. The urethra air bag 3 is arranged on the outer wall of the urethra 1. One end of the urethra air bag air inlet tube 4 is connected to the urethra air bag 3. The other end of the urethra air bag air inlet tube 4 is provided with a urethra air bag inlet 6. The urethra air bag inlet 6 is slowly inflated to gradually expand the urethra in the bladder to fix the urethra.

[0042] The limiting mechanism at the urethral stricture anastomosis is used to fix the position of the urethral stricture drug delivery catheter and the urethral stricture anastomosis relative to each other, so that the 5-fluorouracil combined with glucocorticoid liquid is retained at the anastomosis to the maximum extent, promoting wound healing and preventing scar formation. The limiting mechanism at the urethral stricture anastomosis specifically includes a drug delivery airbag 7, a mesh silicone film 8 on the surface of the drug delivery airbag, an adsorption sponge 9, a drug delivery airbag air inlet tube 11, a drug delivery airbag pressure display 14 and a drug delivery airbag air inlet 16. The drug delivery airbag 7 is arranged on the outer side of the right end of the urethra airbag 3, and the adsorption sponge 9 is arranged on the drug delivery airbag 7. The urethra contact surface of the adsorption sponge 9 is covered with The surface of the medication airbag is provided with a mesh silicone film 8, one end of the medication airbag air inlet tube 11 is connected to the medication airbag 7, and the other end of the medication airbag air inlet tube 11 is provided with a medication airbag air inlet port 16 and a pressure display 14, that is, when in use, the medication airbag air inlet port 16 is inflated to make the adsorption sponge 9 expand under the action of the medication airbag 7, and the indication of the pressure display 14 is observed, and the inflation is stopped when the adsorption sponge 9 is in proper contact with the urethral stricture anastomosis, and the pressure of the medication airbag 7 is maintained, so that the medicine 13 infused on the adsorption sponge 9 can contact with the urethral stricture anastomosis, and the proper pressure is maintained to promote the healing of the urethral stricture anastomosis and prevent scar formation;

[0043] The drug delivery mechanism is used to continuously supply drugs to the adsorption sponge 9, and includes a drug injection tube 10 and a constant pressure perfusion pump 12. One end of the drug injection tube 10 is connected to the adsorption sponge 9, and the other end of the drug injection tube 10 is connected to the constant pressure perfusion pump 12. The constant pressure perfusion pump 12 is filled with drugs 13. When in use, the constant pressure perfusion pump 12 continuously injects the drugs 13 into the adsorption sponge 9 through the drug injection tube 10 to promote the healing of the urethral stricture anastomosis and prevent scar formation.

[0044] The urethral stricture visual balloon dilator is arranged in the inner cavity of the urethra 1, including a urethral stricture scope body 28, a urethral visual system arranged on the urethral stricture scope body 28, and a urethral stricture dilation mechanism and a guiding system in the working channel. When in use, the urethra 1 is guided into the patient's body by utilizing the guiding system, and the urethral visual system is utilized to observe and accurately dilate the patient's stricture for treatment.

[0045] Preferably, in order to make the urethra 1 play a diversion role, the urethra 1 is designed to be a hollow tube, and a side hole 2 is provided on the side wall of the left end of the tube cavity of the urethra 1. The side hole 2 plays a diversion role to drain the urine in the bladder, and the urethra airbag 3 is arranged on the right side of the side hole 2.

[0046] Preferably, in a specific operation, according to the location of the urethral stenosis of the patient, the disposition position of the drug delivery balloon 7 on the urethra 1 includes the posterior urethra, the anterior urethra and the whole urethra.

[0047] Preferably, a visual working channel is further provided in the body 28 of the urethral stricture mirror, and a visible light source optical fiber 25 and a camera data cable 26 are provided in the visual working channel, a visible light source 17 is provided at the end of the visible light source optical fiber 25, a camera 18 is provided at the end of the camera data cable 26, and the other ends of the visible light source optical fiber 25 and the camera data cable 26 are both connected to a display screen 24. When in use, the display screen 24 is used in conjunction with the visible light source 17 and the camera 18 to observe the urethral stricture site of the patient.

[0048] Preferably, in order to ensure the guiding effect of the urethral stricture dilation mechanism and enable the urethral stricture dilation mechanism to accurately dilate the urethral stricture site, the urethral stricture dilation mechanism includes a stricture dilation balloon 19 and a stricture dilation balloon air inlet tube 20, the stricture dilation balloon 19 is arranged on the outside of the safety guide wire 29 and is connected to one end of the stricture dilation balloon air inlet tube 20, and a stricture dilation pressure display 21 is also provided at the stricture dilation air inlet 22 at the other end of the stricture dilation balloon air inlet tube 20; the guiding system includes a safety guide wire working channel 27 and a safety guide wire 29, the safety guide wire working channel 27 is arranged in the urethral stricture mirror body 28, and the safety guide wire 29 is movable It is dynamically connected in the working channel 27 of the safety guidewire, that is, when in use, the urethral stricture mirror body 28 reaches the urethral stricture site under the guidance of the display screen 24 of the urethral stricture visual balloon dilator, and the safety guidewire 29 is passed through the urethral stricture site under direct vision, and the urethral stricture visual balloon dilator mirror body 28 is passed through the urethral stricture site and up to the bladder under the guidance of the hydrophilic guidewire 29, and the mirror is withdrawn to the distal end of the urethral stricture through the rear indwelling safety guidewire, and the position of the safety guidewire is adjusted under direct vision of the display screen 24 so that the urethral stricture expansion balloon is located at the urethral stricture site, and the stricture expansion air inlet 22 is inflated to expand the stricture expansion airbag 19, and the urethral stricture expansion airbag 19 is used to expand the urethral stricture.

[0049] Preferably, in order to prevent the airflow in the ureteral airbag inlet 6 and the medication airbag air inlet 16 from flowing back during and after the inflation process, thereby affecting the use effect, a ureteral airbag air inlet valve 5 is provided at the tube end of the ureteral airbag inlet 6, and a medication airbag air inlet valve 15 is provided at the tube end of the medication airbag air inlet 16; a stenosis expansion airbag air inlet valve 23 is provided at the tube end of the stenosis expansion airbag air inlet tube 20.

[0050] Preferably, in the urethral stenosis medication catheter, the urethra 1, ureteral balloon 3, ureteral balloon air inlet tube 4, ureteral balloon inlet 6, medication balloon 7, medication balloon surface mesh silicone film 8, adsorption sponge 9, drug injection tube 10, medication balloon air inlet tube 11, medication balloon air inlet port 16, etc. are all made of silicone material.

[0051] Preferably, for ease of use, the urinary catheter 1 is designed to have an outer diameter of 8 mm, an inner diameter of 5 mm, and a length of 30 cm.

[0052] Preferably, the drug delivery balloon 7 has a length of 4-8 cm, a maximum outer diameter of 8 mm, and an outer diameter of 10 mm after inflation.

[0053] Preferably, in order to fix the mesh silicone film 8 and the adsorption sponge 9 on the surface of the drug delivery airbag to ensure support and medication effect, convex rings 72 are provided on both sides of the drug delivery airbag 7, and a slot 71 is formed between the two symmetrically arranged convex rings 72, and the adsorption sponge 9 is engaged in the slot 71.

[0054] Preferably, the thickness of the adsorption sponge 9 is 0.25 cm.

[0055] Preferably, the outer diameter of the urethral stricture visual balloon dilator is 5 mm and the length is 70 cm.

[0056] The method for using the urethral stricture medication catheter comprises the following steps:

[0057] S1. Determine the location of urethral stricture according to the results of preoperative urethrography, select the corresponding urethral stricture medication catheter model, and ensure that the adsorption sponge covers the urethral stricture anastomosis;

[0058] S2. Before use, pass the urethral stricture visual balloon dilator through the urethral stricture catheter lumen; insert the urethral stricture visual balloon dilator from the urethral orifice, and reach the urethral stricture site under the guidance of the display of the urethral stricture visual balloon dilator, pass the safety guide wire through the urethral stricture site under direct vision, and continue to advance the scope to the bladder under the guidance of the safety guide wire, slowly withdraw the scope to the distal end of the urethral stricture while leaving the safety guide wire, adjust the safety guide wire under direct vision to position the urethral stricture dilation balloon at the urethral stricture site, and use the urethral stricture dilation balloon to dilate the urethral stricture site;

[0059] S3. After successfully dilating the urethral stricture, continue to advance the scope to the bladder, push the urethra along the urethral stricture visual balloon dilator into the bladder, and withdraw the urethral stricture visual balloon dilator;

[0060] S4. Slowly inflate the catheter balloon to 10-15 ml to fix the catheter to prevent it from falling off, connect the drainage bag, and drain the urine;

[0061] S5. Gently pull the catheter outward, then slowly inflate the air inlet of the medication airbag, which will cause the adsorption sponge to expand, and observe the indication on the pressure display;

[0062] S6. When the adsorption sponge is inflated to a suitable contact with the urethral stricture anastomosis, the inflation is stopped, and the pressure of the drug delivery balloon is maintained so that the drug infused on the adsorption sponge can contact with the urethral stricture anastomosis;

[0063] S7. After inflation, 5-10 ml of medicine is infused into the adsorption sponge every day through a constant pressure infusion pump. The urinary catheter is removed after 2-4 weeks of indwelling.

[0064] Preferably, the drug described in step S7 includes a drug for inhibiting scar growth, and the drug for inhibiting scar growth is 5-fluorouracil or glucocorticoid.

[0065] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A urethral stricture medication catheter, characterized in that: The urethral stricture medication catheter comprises a urethra (1), a urethra fixing mechanism arranged on the lumen of the urethra (1), a limiting mechanism at the urethral stricture anastomosis, a medication mechanism and a urethral stricture visual balloon dilator; The ureteral fixing mechanism comprises a ureteral air bag (3), a ureteral air bag air inlet tube (4) and a ureteral air bag inlet (6); the ureteral air bag (3) is arranged on the ureter (1); one end of the ureteral air bag air inlet tube (4) is connected to the ureteral air bag (3); and the other end of the ureteral air bag air inlet tube (4) is provided with a ureteral air bag inlet (6); The limiting mechanism at the urethral stricture anastomosis comprises a drug delivery air bag (7), an adsorption sponge (9), a drug delivery air bag air inlet tube (11), a drug delivery air bag pressure display (14) and a drug delivery air bag air inlet port (16); the drug delivery air bag (7) is arranged on the right end outer side of the urethral air bag (3); the adsorption sponge (9) is arranged on the drug delivery air bag (7); the urethra contact surface of the adsorption sponge (9) is covered with a drug delivery air bag surface mesh silicone film (8); one end of the drug delivery air bag air inlet tube (11) is connected to the drug delivery air bag (7); the other end of the drug delivery air bag air inlet tube (11) is provided with a drug delivery air bag air inlet port (16) and a pressure display (14); The drug administration mechanism comprises a drug injection tube (10) and a constant pressure perfusion pump (12), one end of the drug injection tube (10) is connected to the adsorption sponge (9), and the other end of the drug injection tube (10) is connected to the constant pressure perfusion pump (12), and the constant pressure perfusion pump (12) contains a drug (13); The urethral stricture visual balloon dilator is arranged in the inner cavity of the urethra (1), comprising a urethral stricture mirror body (28), a urethral visual system arranged on the urethral stricture mirror body (28), and a urethral stricture dilation mechanism and a guiding system arranged in a working channel of the urethral stricture mirror body; The urinary catheter (1) is in the shape of a hollow tube, and a side hole (2) is provided on the side wall of the tube cavity at the left end of the urinary catheter (1), and the urinary catheter air bag (3) is provided on the right side of the side hole (2); According to the location of the urethral stricture of the patient, the location of the drug delivery balloon (7) on the urethra (1) includes the posterior urethra, the anterior urethra and the entire urethra.

2. The urethral stricture medication catheter according to claim 1, characterized in that: The urethral stricture expansion mechanism comprises a stricture expansion balloon (19) and a stricture expansion balloon air inlet tube (20); the stricture expansion balloon (19) is arranged outside the safety guide wire (29) and is connected to one end of the stricture expansion balloon air inlet tube (20); a stricture expansion pressure display (21) is also arranged at the stricture expansion air inlet port (22) at the other end of the stricture expansion balloon air inlet tube (20); the guiding system comprises a safety guide wire working channel (27) and a safety guide wire (29); the safety guide wire working channel (27) is arranged in a urethral stricture mirror body (28), and the safety guide wire (29) is movably connected in the safety guide wire working channel (27).

3. The urethral stricture medication catheter according to claim 2, characterized in that: The guiding system comprises a visible light source optical fiber (25) and a camera data cable (26); a visible light source (17) is arranged at the end of the visible light source optical fiber (25); a camera (18) is arranged at the end of the camera data cable (26); and the other ends of the visible light source optical fiber (25) and the camera data cable (26) are both connected to a display screen (24).

4. The urethral stricture medication catheter according to claim 2, characterized in that: The end of the tube opening of the ureteral airbag inlet (6) is provided with a ureteral airbag air inlet valve (5), the end of the tube opening of the medication airbag inlet (16) is provided with a medication airbag air inlet valve (15); the end of the tube opening of the stenosis expansion airbag inlet tube (20) is provided with a stenosis expansion airbag air inlet valve (23).

5. The urethral stricture medication catheter according to claim 1, characterized in that: (1) The outer diameter of the urinary catheter (1) is 8 mm, the inner diameter is 5 mm, and the length is 30 cm; (2) The drug delivery balloon (7) has a length of 4-8 cm, a maximum outer diameter of 8 mm, and an outer diameter of 10 mm after inflation; (3) The thickness of the adsorption sponge (9) is 0.25 cm; (4) The outer diameter of the lens of the urethral stricture visual balloon dilator is 5 mm and the length is 70 cm.

6. The urethral stricture medication catheter according to claim 1, characterized in that: The medication airbag (7) is provided with convex circles (72) on both sides, and a clamping groove (71) is formed between the two symmetrically arranged convex circles (72), and the adsorption sponge (9) is clamped in the clamping groove (71).

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