Multi-stage urethral stricture dilatation drainage catheter with balloon

Abstract

The invention provides a multi-stage urethral stricture dilatation drainage tube with a balloon, comprising a drainage tube and a support tube, wherein the drainage tube comprises a drainage tube I, a drainage tube II, a drainage tube III and a drainage tube IV; a channel I is arranged in the drainage tube I, a drainage tube II is attached with a head end balloon, and a channel II and a channel III are arranged in the drainage tube II; a channel IV, a channel V, a channel VI, a channel VII and a channel VIII are arranged in the drainage tube III; the outer wall of the drainage tube III is sleeved with balloons I, II and III; a channel IX, a channel X, a channel XI, a channel XII and a channel XIII are arranged in the drainage tube IV; a connector I, a connector II, III, a connector IV and a connector V are arranged on the drainage tube IV; the tail end of the support tube is connected to the connector V; the support tube is inserted into the channel in the connector V and passes through the channel I. The scheme of dilating urethral stricture and draining urine of the present invention can increase the dilation range of stricture, reduce the number of replacement times of drainage tube, and shorten the course of disease.

Description

Technical Field

[0001] The present invention relates to the field of minimally invasive medical technology and surgical instrument technology, and in particular to a multi-stage urethral stricture dilation drainage tube with a balloon, which is a minimally invasive surgical instrument used for urethral stricture dilation and urine drainage. Background Art

[0002] A urinary catheter is a common medical device in clinical practice. It is inserted into the bladder through the external urethral opening to drain urine out of the body. Its main function is to accurately record urine volume, facilitate drainage and flushing, etc., and it plays an important role in clinical practice.

[0003] The materials of the currently used urinary catheters are mainly silicone, rubber, EVA, PVC, etc., and the tube body is relatively soft. For patients with diseases such as urethral stenosis, prostatic hyperplasia, prostatitis, prostatic tumors, and urethral injuries, the inner diameter, course, and curvature of the urethra change. The resistance is large during the conventional indwelling urinary catheterization process, and a large force is required. The violent intubation not only brings great pain to the patient, but also easily causes secondary urethral injury, such as false passage, bleeding, perforation, etc., which in turn aggravates the severity of urethral diseases, affects the healing of the urethra, and even causes complex urethral injury and stenosis, which seriously affects the patient's quality of life. For the above-mentioned patients, in order to increase the success rate of indwelling urinary catheterization and reduce the incidence of complications, a drainage tube can be inserted under the guidance of a guide wire. However, the existing urinary catheters mostly adopt a tube body with a closed front end and an open rear end, and the side opening is connected to the urinary catheter lumen. When the guide wire is inserted, the guide wire is led out from the side opening of the urinary catheter through the lumen, and the catheter head is not parallel to the guide wire, resulting in guidance difficulties and failure of indwelling urinary catheterization.

[0004] Even if a small catheter can be inserted, its drainage effect is poor, and urine retention is likely to occur again after removal. In order to maintain smooth spontaneous urination, urethral dilation is often required for the above patients. The conventional method currently adopted is to dilate the urethra with a metal urethral dilator, which is often used to dilate the urethra multiple times from small to large sizes, and then insert a thicker catheter for a long time to support it to promote the healing of the damaged mucosa. However, this operation time is long, which not only increases the pain of the patient, but also the metal urethral dilator is inconvenient to retain during catheterization, and the thick catheter is still difficult to insert. Summary of the invention

[0005] According to the above-mentioned conventional method currently adopted, the operation time of dilating the urethra with a metal urethral dilator is long, which not only increases the pain of the patient, but also the metal urethral dilator is inconvenient to retain during catheterization, and the thick catheter is still difficult to insert. A multi-stage urethral stricture dilation drainage tube with a balloon is provided. The scheme of the present invention for dilating urethral stricture and urine mainly utilizes that the hardness of the drainage tube is greater than that of a conventional urinary catheter, the tube diameter is thinner, the head end is tapered, and the built-in support tube is easy to pass through the stricture; the head end balloon at the front end of the drainage tube prevents the displacement of the drainage tube; the multi-balloon design is adopted to increase the range of stricture dilation, reduce the number of drainage tube replacements, and shorten the course of the disease; the multiple balloons are fixed in an overlapping manner, and each balloon is gradually filled from the inside to the outside, which can achieve step-by-step dilation of the urethra, with less pain, and will not cause the tearing of the urethral mucosa and the occurrence of secondary stricture caused by scar repair.

[0006] The technical means adopted by the present invention are as follows:

[0007] A multi-stage urethral stricture dilatation drainage tube with a balloon, comprising: a drainage tube and a support tube, wherein the drainage tube comprises a drainage tube I, a drainage tube II, a drainage tube III and a drainage tube IV which are sequentially connected to each other from the beginning to the end;

[0008] The drainage tube I is conical and is a single-channel drainage tube, and is provided with a channel I therein; the drainage tube I is provided with two elliptical side holes, and both of the side holes are connected to the channel I for draining urine;

[0009] The drainage tube II is a double-channel drainage tube, with a head-end balloon attached, and is provided with a channel II connected to the channel I and a channel III connected to the head-end balloon, and the proximal end of the channel III is a blind end; the attached head-end balloon refers to the head-end balloon sleeved on the outer wall of the drainage tube II;

[0010] The drainage tube III is a five-channel drainage tube, which is provided with a channel IV, a channel V, a channel VI, a channel VII connected to the channel II, and a channel VIII connected to the channel III, and the head ends of the channel V, the channel VI and the channel VII are blind ends;

[0011] The outer wall of the drainage tube III is concave, and is in turn sleeved with overlapping balloons I, II and III from the inside to the outside. Both ends of the balloons I, II and III are conical, and the middle body is cylindrical;

[0012] The wall of the drainage tube III is provided with through holes I, II and III, which are respectively connected to the channel V, the channel VI and the channel VII, and the head ends of the channel V, the channel VI and the channel VII are respectively connected to the balloon I, the balloon II and the balloon III;

[0013] The drainage tube IV is a five-channel drainage tube, which is provided with a channel IX, a channel X, a channel XI, a channel XII and a channel XIII. The channel IX is connected to the channel IV, the channel XIII is connected to the channel VIII, the channel X, the channel XI and the channel XII are connected to the channel V, the channel VI and the channel VII respectively; the tail ends of the channel X, the channel XI, the channel XII and the channel XIII are blind ends;

[0014] The wall of the drainage tube IV is provided with single-channel connectors I, II, III and IV, which are respectively connected to the tail ends of the channels X, XI, XII and XIII; the middle of the bottom end of the drainage tube IV is provided with a connector V connected to the channel IX;

[0015] The surfaces of the connectors I, II, III, IV and V are all provided with single-channel valves, and the outer wall surfaces are provided with spiral grooves;

[0016] Resistance blocks are provided on both sides of the head end of the support tube, and the resistance blocks are connected with the inner wall of the channel I; the support tube is a single-channel metal tube, the main body is cylindrical, and a single-channel connecting cap is provided at the tail end. The inner wall of the connecting cap is provided with a spiral groove I, and the spiral groove I is connected with the spiral groove on the outer wall of the connecting head V; the main body of the support tube is inserted into the channel in the connecting head V and passes through the channel I.

[0017] Furthermore, the drainage tube has a length of 40 cm and a tube diameter of 8-12 Fr.

[0018] Furthermore, the maximum diameter of the head end balloon when inflated is 2 cm, and the head end balloon is elliptical when inflated;

[0019] The upper and lower ends of the head end balloon are fixed to the wall of the drainage tube II through a metal ring I and a metal ring II respectively.

[0020] Furthermore, the length of the balloon I is 35 cm, the balloon II is 1 cm longer than the balloon I, and the balloon III is 1 cm longer than the balloon II;

[0021] The expanded diameters of the balloon I, the balloon II and the balloon III are 12Fr, 14Fr and 16Fr, or 18Fr, 20Fr and 22Fr, or 24Fr, 26Fr and 28Fr, respectively;

[0022] The head ends of the balloons I, II and III are flush and are all fixed to the wall of the drainage tube III by a metal ring III;

[0023] The tail ends of the balloons I, II and III are fixed to the wall of the drainage tube III through metal rings IV, V and VI respectively.

[0024] Furthermore, the connector I is connected to a syringe or a pressure pump, and a physiological saline solution containing a contrast agent is injected to fill the head end balloon;

[0025] The connector II is connected to a syringe or a pressure pump, and physiological saline containing contrast agent is gradually injected to slowly fill the balloon I to expand the urethra;

[0026] The connector III and the connector IV are connected to a syringe or a pressure pump, and physiological saline containing contrast agent is gradually injected to slowly fill balloon II and balloon III, and the larger diameter balloon II and balloon III are used to dilate the urethra;

[0027] The connector V is connected to a drainage bag to drain urine.

[0028] The blind end mentioned above refers to the L-shaped head end of the water injection and gas injection channel, which is connected to the balloon cavity through the side wall hole.

[0029] Compared with the prior art, the present invention has the following advantages:

[0030] 1. The multi-stage urethral stricture dilatation drainage tube with a balloon provided by the present invention can be inserted into the urethra under the guidance of a guide wire, which is simpler to operate and will not cause secondary damage to the urethra.

[0031] 2. The multi-stage urethral stricture dilatation drainage tube with a balloon provided by the present invention is harder than a conventional urinary catheter, has a thinner diameter, a tapered head end, and a built-in support tube, making it easy to pass through the stricture.

[0032] 3. The multi-stage urethral stricture dilatation drainage tube with a balloon provided by the present invention has a balloon at the head end which has the function of preventing the displacement of the drainage tube.

[0033] 4. The multi-stage urethral stricture dilatation drainage tube with balloon provided by the present invention adopts a multi-balloon design, which increases the range of stricture dilation, reduces the number of drainage tube replacements, and shortens the course of the disease.

[0034] 5. The multi-stage urethral stricture dilatation drainage tube with balloons provided by the present invention has multiple balloons fixed in an overlapping manner, and each balloon is gradually filled from the inside to the outside, which can achieve step-by-step expansion of the urethra with little pain and will not cause tearing of the urethral mucosa or the occurrence of secondary stricture due to scar repair.

[0035] 5. The multi-stage urethral stricture dilatation drainage tube with balloon provided by the present invention has each balloon with a fixed diameter, and can reach the dilated diameter under relatively low pressure, has low pressure requirements, is simple to operate, and has low manufacturing cost.

[0036] In summary, the application of the technical solution of the present invention can solve the problem that the conventional method of using a metal urethral dilator to dilate the urethra takes a long time to operate, which not only increases the pain of the patient, but also makes it inconvenient to retain the metal urethral dilator during catheterization, and the thick catheter is still difficult to insert.

[0037] Based on the above reasons, the present invention can be widely promoted in the fields of minimally invasive medical technology and surgical instruments. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0039] Figure 1 It is a schematic structural diagram of a multi-stage urethral stricture dilatation drainage tube with a balloon in a specific embodiment of the present invention.

[0040] Figure 2 It is a schematic diagram of the structure of the drainage tube in a specific embodiment of the present invention.

[0041] Figure 3 for Figure 2 Middle AA section view.

[0042] Figure 4 for Figure 2 Middle BB cross-section.

[0043] Figure 5 for Figure 2 Middle CC section.

[0044] Figure 6 for Figure 2 Middle DD section view.

[0045] Figure 7 for Figure 2 Middle EE section view.

[0046] Figure 8 for Figure 2 Middle FF cross-section.

[0047] Fig. 9 for Figure 2 Middle GG cross-section.

[0048] Fig.10 It is a schematic diagram of the structure of the support tube in a specific implementation manner of the present invention.

[0049] Fig.11It is a schematic diagram of a multi-stage urethral stricture dilatation drainage tube with a balloon in a working state (the balloon at the head end is filled) in a specific embodiment of the present invention.

[0050] Fig.12 It is a schematic diagram of a multi-stage urethral stricture dilatation drainage tube with a balloon in a working state in a specific embodiment of the present invention (the head end balloon and balloon I are filled).

[0051] Fig.13 It is a schematic diagram of a multi-stage urethral stricture dilatation drainage tube with balloons in a working state in a specific embodiment of the present invention (the head end balloon, balloon I and balloon II are filled).

[0052] Fig.14 It is a schematic diagram of a multi-stage urethral stricture dilatation drainage tube with balloons in a working state in a specific embodiment of the present invention (the head end balloon, balloon I, balloon II and balloon III are filled).

[0053] In the figure: 1. Drainage tube I; 2. Drainage tube II; 3. Drainage tube III; 4. Drainage tube IV; 5. Support tube;

[0054] 11. Channel I; 12. Side hole;

[0055] 21. Head end balloon; 22. Channel II; 23. Channel III; 24. Metal ring I; 25. Metal ring II;

[0056] 31. Channel IV; 32. Channel V; 33. Channel VI; 34. Channel VII; 35. Channel VIII; 36. Balloon I; 37. Balloon II; 38. Balloon III; 39. Metal ring III; 310. Metal ring IV; 311. Metal ring V; 312. Metal ring VI;

[0057] 41. Channel IX; 42. Channel X; 43. Channel XI; 44. Channel XII; 45. Channel XIII; 46. Connector I; 47. Connector II; 48. Connector III; 49. Connector IV; 410. Connector V; 411. Syringe or pressure pump. DETAILED DESCRIPTION

[0058] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0059] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0060] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0061] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, the numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0062] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0063] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0064] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0065] like Figure 1-14 As shown, the present invention provides a multi-stage urethral stricture dilatation drainage tube with a balloon, comprising: a drainage tube and a support tube 5, wherein the drainage tube comprises a drainage tube I1, a drainage tube II2, a drainage tube III3 and a drainage tube IV4 which are sequentially connected to each other from the beginning to the end;

[0066] The drainage tube I1 is the head of the drainage tube, is conical, and is a single-channel drainage tube, and is provided with a channel I11 therein; the drainage tube I1 is provided with two elliptical side holes 12, and both of the side holes 12 are connected to the channel I11 for draining urine;

[0067] The drainage tube II2 is a double-channel drainage tube, with a head end balloon 21 attached, and is provided with a channel II22 connected to the channel I11 and a channel III23 connected to the head end balloon 21. The channel III23 is placed between the channel II22 and the inner wall of the drainage tube II2 (such as Figure 4 As shown), the proximal end of the channel III 23 is a blind end (the proximal end refers to the end close to the drainage tube I 1);

[0068] The drainage tube III3 is a five-channel drainage tube, which is provided with a channel IV31, a channel V32, a channel VI33, a channel VII34 connected to the channel II22, and a channel VIII35 connected to the channel III23. The channel V32, the channel VI33, the channel VII34 and the channel VIII35 are placed between the channel IV31 and the inner wall of the drainage tube III3 (such as Figure 5 , Figure 6 and Figure 8As shown), the head ends of the channels V32, VI33 and VII34 are blind ends; the drainage tube III3 is the body of the drainage tube;

[0069] The outer wall of the drainage tube III3 is concave, and is inset with overlapping balloons I36, II37 and III38 in sequence from the inside to the outside. Both ends of the balloons I36, II37 and III38 are conical, and the middle body is cylindrical.

[0070] The wall of the drainage tube III3 is provided with through holes I, II and III, which are respectively connected to the channel V32, the channel VI33 and the channel VII34; the wall is the wall of the drainage tube III3 that is wrapped by the balloon; the head ends of the channel V32, the channel VI33 and the channel VII34 are respectively connected to the balloon I36, the balloon II37 and the balloon III38; wherein the head end of the channel V32 is connected to the balloon I36 through the through hole I, the head end of the channel VI33 is connected to the balloon II37 through the through hole II, and the head end of the channel VII34 is connected to the balloon III38 through the through hole III;

[0071] The drainage tube IV4 is a five-channel drainage tube, which is provided with a channel IX41, a channel X42, a channel XI43, a channel XII44 and a channel XIII45. The channel IX41 is connected to the channel IV31, the channel XIII45 is connected to the channel VIII35, the channel X42, the channel XI43 and the channel XII44 are connected to the channel V32, the channel VI33 and the channel VII34 respectively; the channel X42, the channel XI43, the channel XII44 and the channel XIII45 are placed between the channel IX41 and the inner wall of the drainage tube IV4 (such as Figure 7 The tail ends of the channel Ⅹ42, the channel Ⅺ43, the channel Ⅻ44 and the channel ⅩIII45 are blind ends; the drainage tube IV4 is the tail of the drainage tube;

[0072] The wall of the drainage tube IV4 is provided with single-channel connectors I46, II47, III48 and IV49, which are respectively connected to the tail ends of the channel X42, XI43, XII44 and XIII45; the middle part of the bottom end of the drainage tube IV4 is provided with a connector V410 connected to the channel IX41;

[0073] The surfaces of the connectors I46, II47, III48, IV49 and V410 are all provided with single-channel valves, and the outer wall surfaces are provided with spiral grooves;

[0074] Resistance blocks are provided on both sides of the head end of the support tube 5, and the resistance blocks are connected with the inner wall of the channel I11; the support tube 5 is a single-channel metal tube, the main body is cylindrical, and a single-channel connecting cap is provided at the tail end, and the inner wall of the connecting cap is provided with a spiral groove I, and the spiral groove I is connected with the spiral groove on the outer wall of the connecting head V410; the main body of the support tube 5 is inserted into the channel in the connecting head V410 and passes through the channel I11.

[0075] The drainage tube has a length of 40 cm and a diameter of 8-12 Fr.

[0076] The maximum diameter of the head end balloon 21 when filled is 2 cm, and the head end balloon 21 is elliptical when filled;

[0077] The upper and lower ends of the head end balloon 21 are fixed to the wall of the drainage tube II 2 through a metal ring I 24 and a metal ring II 25 respectively.

[0078] The length of the balloon I 36 is 35 cm, the balloon II 37 is 1 cm longer than the balloon I 36, and the balloon III 38 is 1 cm longer than the balloon II 37;

[0079] The expanded diameters of the balloon I 36, the balloon II 37 and the balloon III 38 are 12Fr, 14Fr and 16Fr, or 18Fr, 20Fr and 22Fr, or 24Fr, 26Fr and 28Fr, respectively;

[0080] The head ends of the balloons I 36, II 37 and III 38 are flush and fixed to the wall of the drainage tube III 3 by a metal ring III 39;

[0081] The tail ends of the balloons I 36 , II 37 and III 38 are fixed to the wall of the drainage tube III 3 via metal rings IV 310 , V 311 and VI 312 , respectively.

[0082] During clinical operation, the guide wire is first inserted into the bladder through the external urethral opening, and under the guidance of the guide wire, the multi-stage urethral stricture dilatation drainage tube equipped with a support tube is inserted into the bladder, and the syringe or pressure pump 411 is connected through the connector I 46, and saline containing contrast agent or air is injected to fill the head end balloon 21, and the connector I 46 is closed. The connector II 47 is connected to the syringe or pressure pump 411, and saline containing contrast agent is gradually injected, and the cylindrical dilatation balloon is slowly filled to dilate the urethra, and then the syringe or pressure pump 411 is connected through the connector III 48 and the connector IV 49, and saline containing contrast agent is gradually injected, and the balloon II 37 and balloon III 38 are slowly filled, and the balloon II 37 and balloon III 38 with a larger diameter are used to dilate the urethra; the connector V 410 is connected to the drainage bag to drain urine. The scheme of dilating urethral stricture and draining urine according to the present invention can increase the dilation range of stricture, reduce the number of replacement times of drainage tubes, shorten the course of disease, and the manufacturing cost of the present invention is low.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-stage urethral stricture dilatation drainage tube with a balloon, characterized in that: include: A drainage tube and a support tube (5), wherein the drainage tube comprises a drainage tube I (1), a drainage tube II (2), a drainage tube III (3) and a drainage tube IV (4) which are sequentially connected to each other from the beginning to the end; The drainage tube I (1) is conical and is a single-channel drainage tube, and is provided with a channel I (11) therein; the drainage tube I (1) is provided with two elliptical side holes (12), and the two side holes (12) are both connected to the channel I (11) for draining urine; The drainage tube II (2) is a double-channel drainage tube, to which a head end balloon (21) is attached, and is provided with a channel II (22) communicating with the channel I (11) and a channel III (23) communicating with the head end balloon (21), wherein the proximal end of the channel III (23) is a blind end; The drainage tube III (3) is a five-channel drainage tube, which is provided with a channel IV (31) connected to the channel II (22), a channel V (32), a channel VI (33), a channel VII (34) and a channel VIII (35) connected to the channel III (23), and the head ends of the channel V (32), the channel VI (33) and the channel VII (34) are blind ends; The outer wall of the drainage tube III (3) is concave, and is in turn sleeved with overlapping balloons I (36), II (37) and III (38) from the inside to the outside. Both ends of the balloons I (36), II (37) and III (38) are conical, and the middle body is cylindrical; The wall of the drainage tube III (3) is provided with a through hole I, a through hole II and a through hole III, which are respectively connected to the channel V (32), the channel VI (33) and the channel VII (34); the head ends of the channel V (32), the channel VI (33) and the channel VII (34) are respectively connected to the balloon I (36), the balloon II (37) and the balloon III (38); The drainage tube IV (4) is a five-channel drainage tube, which is provided with a channel IX (41), a channel X (42), a channel XI (43), a channel XII (44) and a channel XIII (45); the channel IX (41) is connected to the channel IV (31), the channel XIII (45) is connected to the channel VIII (35), the channel X (42), the channel XI (43) and the channel XII (44) are connected to the channel V (32), the channel VI (33) and the channel VII (34) respectively; the tail ends of the channel X (42), the channel XI (43), the channel XII (44) and the channel XIII (45) are blind ends; The wall of the drainage tube IV (4) is provided with single-channel connectors I (46), II (47), III (48) and IV (49), which are respectively connected to the tail ends of the channel X (42), the channel XI (43), the channel XII (44) and the channel XIII (45); the middle part of the bottom end of the drainage tube IV (4) is provided with a connector V (410) which is connected to the channel IX (41); The surfaces of the connectors I (46), II (47), III (48), IV (49) and V (410) are all provided with single-channel valves, and the outer wall surfaces are provided with spiral grooves; Resistance blocks are provided on both sides of the head end of the support tube (5), and the resistance blocks are connected in cooperation with the inner wall of the channel I (11); the support tube (5) is a single-channel metal tube, the body of which is cylindrical, and the tail end is provided with a single-channel connecting cap, the inner wall of the connecting cap is provided with a spiral groove I, and the spiral groove I is connected in cooperation with the spiral groove on the outer wall of the connecting head V (410); the body of the support tube (5) is inserted into the channel in the connecting head V (410) and passes through the channel I (11); The maximum diameter of the head end balloon (21) when filled is 2 cm, and the head end balloon (21) is elliptical when filled; The upper and lower ends of the head end balloon (21) are fixed to the wall of the drainage tube II (2) via a metal ring I (24) and a metal ring II (25) respectively; The length of the balloon I (36) is 35 cm, the balloon II (37) is 1 cm longer than the balloon I (36), and the balloon III (38) is 1 cm longer than the balloon II (37); The expanded diameters of the balloon I (36), the balloon II (37) and the balloon III (38) are 12Fr, 14Fr and 16Fr, or 18Fr, 20Fr and 22Fr, or 24Fr, 26Fr and 28Fr, respectively; The head ends of the balloons I (36), II (37) and III (38) are flush and fixed to the wall of the drainage tube III (3) via a metal ring III (39); The tail ends of the balloon I (36), balloon II (37) and balloon III (38) are fixed to the wall of the drainage tube III (3) via metal ring IV (310), metal ring V (311) and metal ring VI (312), respectively.

2. The multi-stage urethral stricture dilatation drainage tube with a balloon according to claim 1, characterized in that: The drainage tube has a length of 40 cm and a diameter of 8-12 Fr.

3. The multi-stage urethral stricture dilatation drainage tube with a balloon according to claim 1 or 2, characterized in that: The connector I (46) is connected to a syringe or a pressure pump (411) to inject physiological saline containing contrast agent to fill the head end balloon (21); The connector II (47) is connected to a syringe or a pressure pump (411), and physiological saline containing contrast agent is gradually injected to slowly fill the balloon I (36) to expand the urethra; The connector III (48) and the connector IV (49) are connected to a syringe or a pressure pump (411), and physiological saline containing contrast agent is gradually injected to slowly fill the balloon II (37) and the balloon III (38), and the balloon II (37) and the balloon III (38) with a larger diameter are used to dilate the urethra; The connector V (410) is connected to a drainage bag to drain urine.

Images