CN111450391A

CN111450391A - Multi-stage urethral stricture dilatation type drainage tube with saccule

Info

Publication number: CN111450391A
Application number: CN202010393179.7A
Authority: CN
Inventors: 高秀珍; 张�诚
Original assignee: Shanghai East Hospital Tongji University Affiliated East Hospital
Current assignee: Shanghai East Hospital Tongji University Affiliated East Hospital
Priority date: 2020-05-11
Filing date: 2020-05-11
Publication date: 2020-07-28

Abstract

The invention provides a multi-stage urethral stricture dilatation type drainage tube with a balloon, which comprises 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, and a balloon at the attached end of the drainage tube II is provided with a channel II and a channel III; 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 a balloon I, a balloon II and a balloon III; a channel IX, a channel X, a channel XI, a channel XII and a channel XIII are arranged in the drainage tube IV; the drainage tube IV is provided with a connector I, a connector II, a connector III, a connector IV and a connector V; the tail end of the supporting tube is connected with a connector V; the support tube is inserted into the channel in the connector V and penetrates through the channel I. By adopting the scheme of expanding the urethral stricture and urinating, the invention can increase the stricture expanding range, reduce the replacement times of the drainage tube and shorten the course of disease.

Description

Multi-stage urethral stricture dilatation type drainage tube with saccule

Technical Field

The invention relates to the technical field of minimally invasive medical technology and surgical instruments, in particular to a multi-stage urethral stricture dilation type drainage tube with a balloon, which is a minimally invasive surgical instrument for urethral stricture dilation and urine drainage.

Background

The urinary catheter is a common clinical medical instrument, is placed into the bladder through the external orifice of the urethra to drain urine to the outside of the body, has the main functions of accurately recording urine volume, facilitating drainage, flushing and the like, and plays an important role in clinic.

The catheter applied at present is mainly made of silica gel, rubber, EVA, PVC and the like, and the catheter body is softer. For patients with symptoms such as urethral stricture, prostatic hyperplasia, prostatitis, prostate tumor, and urethral injury, the internal diameter, the running and the bending degree of the urethra change. The conventional urethral catheterization in-process resistance is great, needs to use great strength, and violence intubate not only brings huge misery for the patient, causes secondary urethra damage even easily, such as false way, hemorrhage, perforation etc. and then has aggravated the severity of urethra disease, has influenced the healing of urethra, leads to the urethra damage and the stenosis of complexity even, has seriously influenced patient's quality of life. For the patients outlined above, in order to increase the success rate of indwelling catheters and reduce the incidence of complications, a drainage catheter may be placed under the guidance of a guidewire. The prior catheter mostly adopts a tube body with a closed front end and an open back end, wherein a side opening is communicated with a catheter cavity, when the guide wire is put in, the guide wire is led out from the side opening of the catheter through the tube cavity, and the head end of the urinary catheter is not parallel to the guide wire, thus leading to difficult guide and failure of indwelling urinary catheter.

Even if the catheter can be placed into a small-sized urinary catheter, the drainage effect is poor, and the urinary retention is easy to occur again after the catheter is pulled out. In order to keep the spontaneous urination smooth, urethral dilation is often required for the above-mentioned patients. The conventional method adopted at present is to expand the urethra by a metal urethra dilator, multiple urethra dilations from small size to large size are mostly adopted, and then a thick ureter is inserted for supporting for a long time so as to promote the healing of injured mucous membrane.

Disclosure of Invention

According to the technical problems that the metal urethral dilator has long operation time for dilating the urethra and not only increases the pain of a patient, but also the metal urethral dilator is inconvenient to retain during urethral catheterization and a thick urethral catheter is still difficult to insert, the multi-stage urethral stricture dilation type drainage tube with the saccule is provided. The invention provides a scheme for dilating and urinating urethral stricture, which mainly utilizes that the hardness of a drainage tube is higher than that of a conventional urinary catheter, the diameter of the drainage tube is thinner, the head end of the drainage tube is tapered, a supporting tube is arranged in the drainage tube, and the drainage tube is easy to pass through the stricture; the head end saccule at the front end of the drainage tube prevents the drainage tube from moving; the multi-balloon design is adopted, so that the range of stricture expansion is enlarged, the times of replacing the drainage tube are reduced, and the course of disease is shortened; many sacculums take the intussusception mode to fix, each sacculus is full of gradually from inside to outside, can realize urethral expansion step by step, and the misery is little, can not cause the emergence of urethral mucosa's tear and scar repair secondary stenosis that leads to.

The technical means adopted by the invention are as follows:

a balloon-equipped multistage urethral stricture dilation type drainage tube comprising: 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 with one another from head to tail;

the drainage tube I is conical and is a single-channel drainage tube, and a channel I is arranged in the drainage tube I; two oval side holes are formed in the drainage tube I, and the two side holes are communicated with the channel I and used for discharging urine;

the drainage tube II is a double-channel drainage tube, a head end sacculus is attached to the drainage tube II, a channel II communicated with the channel I and a channel III communicated with the head end sacculus are arranged in the drainage tube II, and the near end of the channel III is a blind end; the attached head end sacculus is a joint end sacculus sleeved on the outer wall of the drainage tube II;

the drainage tube III is a five-channel drainage tube, a channel IV, a channel V, a channel VI and a channel VII which are communicated with the channel II and a channel VIII which is communicated with the channel III are arranged in the drainage tube III, and the head ends of the channel V, the channel VI and the channel VII are blind ends;

the outer wall of the drainage tube III is concave, and is sequentially sleeved with a sleeved saccule I, a saccule II and a saccule III from inside to outside, the two ends of the saccule I, the saccule II and the saccule III are conical, and the middle body is cylindrical;

the tube wall of the drainage tube III is provided with a through hole I, a through hole II and a through hole III which are respectively communicated with 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 communicated with the saccule I, the saccule II and the saccule III;

the drainage tube IV is a five-channel drainage tube, a channel IX, a channel X, a channel XI, a channel XII and a channel XIII are arranged in the drainage tube IV, the channel IX is communicated with the channel IV, the channel XIII is communicated with the channel VIII, and the channel X, the channel XI and the channel XII are respectively communicated with the channel V, the channel VI and the channel VII; the tail ends of the passages X, XI, XII and XIII are blind ends;

a single-channel connector I, a connector II, a connector III and a connector IV are arranged on the tube wall of the drainage tube IV and are respectively communicated with the tail ends of the channels X, XI, XII and XIII; a connector V communicated with the channel IX is arranged in the middle of the bottom end of the drainage tube IV;

the surfaces of the connector I, the connector II, the connector III, the connector IV and the connector V are provided with single-channel valves, and the surface of the outer wall is provided with a spiral groove;

resistance blocks are arranged on two sides of the head end of the supporting tube and are connected with the inner wall of the channel I in a matched mode; the supporting tube is a single-channel metal tube, the body is cylindrical, a single-channel connecting cap is arranged at the tail end of the supporting tube, a spiral groove I is formed in the inner wall of the connecting cap, and the spiral groove I is connected with a spiral groove in the outer wall of the connector V in a matched mode; the body of the supporting tube is inserted into a channel in the connector V and penetrates out of the channel I.

Further, the length of the drainage tube is 40cm, and the tube diameter is 8-12 Fr.

Further, the maximum diameter of the head end saccule is 2cm when the head end saccule is full, and the head end saccule is elliptic after being full;

the upper end and the lower end of the head end saccule are respectively fixed with the tube wall of the drainage tube II through a metal ring I and a metal ring II.

Further, the length of the balloon I is 35cm, the balloon II is 1cm longer than the balloon I, and the balloon III is 1cm longer than the balloon II;

the expansion diameters of the balloon I, the balloon II and the balloon III are respectively 12Fr, 14Fr and 16Fr, or 18Fr, 20Fr and 22Fr, or 24Fr, 26Fr and 28 Fr;

the head ends of the saccule I, the saccule II and the saccule III are flush and are fixed with the wall of the drainage tube III through a metal ring III;

the tail ends of the saccule I, the saccule II and the saccule III are respectively fixed with the tube wall of the drainage tube III through a metal ring IV, a metal ring V and a metal ring VI.

Further, the connector I is connected with an injector or a pressure pump, and physiological saline containing a contrast agent is injected to fill the head end saccule;

the connector II is connected with an injector or a pressure pump, physiological saline containing a contrast agent is gradually injected, and the balloon I is slowly filled to expand the urethra;

the connector III and the connector IV are connected with an injector or a pressure pump, physiological saline containing a contrast agent is gradually injected, the balloon II and the balloon III are slowly filled, and the larger diameter of the balloon II and the balloon III is used for dilating the urethra;

the connector V is connected with a drainage bag to drain urine.

The blind end refers to the head end of the water injection and air injection channel which is L-shaped and is connected with the sacculus cavity through the side wall hole.

Compared with the prior art, the invention has the following advantages:

1. the multi-stage urethral stricture dilation type drainage tube with the balloon can be placed into a urethra under the guidance of the guide wire, the operation is simpler, and secondary injury to the urethra cannot be caused.

2. The hardness of the multi-stage urethral stricture dilatation type drainage tube with the balloon is higher than that of a conventional ureter, the tube diameter is thin, the head end is conical, a supporting tube is arranged in the multi-stage urethral stricture dilatation type drainage tube, and stricture can be easily passed through the multi-stage urethral stricture dilatation type drainage tube.

3. According to the multi-stage urethral stricture dilatation type drainage tube with the balloon, the balloon at the head end has the function of preventing the drainage tube from shifting.

4. The multi-stage urethral stricture dilation type drainage tube with the balloon, provided by the invention, adopts a multi-balloon design, so that the stricture dilation range is enlarged, the times of replacing the drainage tube are reduced, and the course of disease is shortened.

5. According to the multi-stage urethral stricture dilation type drainage tube with the balloons, the multiple balloons are fixed in an intussusception mode, each balloon is gradually filled from inside to outside, the urethral stricture can be realized step by step, the pain is low, and the secondary stricture caused by urethral mucosa tearing and scar repair can not be caused.

5. The multi-stage urethral stricture dilation type drainage tube with the balloons, provided by the invention, has the advantages that each balloon has a fixed diameter, the dilation diameter can be achieved under small pressure, the requirement on pressure is low, the operation is simple, and the manufacturing cost is low.

In conclusion, the technical scheme of the invention can solve the problems that the operation time of expanding the urethra of the metal urethral dilator is longer in the conventional method adopted at present, the pain of a patient is increased, the metal urethral dilator is inconvenient to keep during urethral catheterization, and a thick urethral catheter is still difficult to insert.

Based on the reasons, the invention can be widely popularized in the fields of minimally invasive medical technology, surgical instruments and the like.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of a balloon-equipped multiple stage urethral stricture dilation type drainage tube according to an embodiment of the present invention.

FIG. 2 is a schematic view of the structure of a draft tube in an embodiment of the present invention.

Fig. 3 is a cross-sectional view taken along line a-a of fig. 2.

Fig. 4 is a cross-sectional view taken along line B-B of fig. 2.

Fig. 5 is a cross-sectional view taken along line C-C of fig. 2.

Fig. 6 is a cross-sectional view taken along line D-D in fig. 2.

Fig. 7 is a cross-sectional view taken along line E-E in fig. 2.

Fig. 8 is a sectional view taken along line F-F in fig. 2.

Fig. 9 is a sectional view taken along line G-G in fig. 2.

Fig. 10 is a schematic structural view of a support tube according to an embodiment of the present invention.

FIG. 11 is a schematic view of the multi-stage urethral stricture dilation type drainage tube with balloon in accordance with the embodiment of the present invention in an operating state (with the balloon at the tip filled).

Fig. 12 is a schematic view showing the multi-stage urethral stricture dilation type drainage tube with balloon in the working state (the head end balloon and the balloon i are inflated) according to the embodiment of the present invention.

Fig. 13 is a schematic view of the multi-stage urethral stricture dilation type drainage tube with balloon in the working state (the head end balloon, the balloon i and the balloon ii are inflated) according to the embodiment of the present invention.

Fig. 14 is a schematic view of the multi-stage urethral stricture dilation type drainage tube with balloon in the working state (the head end balloon, the balloon i, the balloon ii and the balloon iii are inflated) according to the embodiment of the present invention.

In the figure: 1. a drainage tube I; 2. a drainage tube II; 3. a drainage tube III; 4. a drainage tube IV; 5. supporting a tube;

11. a channel I; 12. a side hole;

21. a head end balloon; 22. a channel II; 23. a channel III; 24. a metal ring I; 25. a metal ring II;

31. a channel IV; 32. a channel V; 33. a passageway VI; 34. a channel VII; 35. a channel VIII; 36. a sacculus I; 37. a balloon II; 38. a balloon III; 39. a metal ring III; 310. a metal ring IV; 311. a metal ring V; 312. a metal ring VI;

41. a channel IX; 42. a channel X; 43. a passageway XI; 44. a channel XII; 45. channel xiii; 46. a connector I; 47. a connector II; 48. a connector III; 49. a connector IV; 410. a connector V; 411. a syringe or a pressure pump.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

In order to make the objects, 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 with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. Any specific values in all examples shown and discussed herein are to be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the absence of any contrary indication, these directional terms are not intended to indicate and imply that the device or element so referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be considered as limiting the scope of the present invention: the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.

As shown in fig. 1 to 14, the present invention provides a balloon-equipped multistage urethral stricture dilation type drainage tube comprising: the drainage tube comprises a drainage tube I1, a drainage tube II 2, a drainage tube III 3 and a drainage tube IV 4 which are sequentially connected with one another from head to tail;

the drainage tube I1 is a conical drainage tube with a single channel and is the head of the drainage tube, and a channel I11 is arranged in the drainage tube; two oval side holes 12 are formed in the drainage tube I1, and the two side holes 12 are communicated with the channel I11 and used for discharging urine;

the drainage tube II 2 is a double-channel drainage tube, a head end sacculus 21 is attached to the drainage tube II 2, a channel II 22 communicated with the channel I11 and a channel III 23 communicated with the head end sacculus 21 are arranged in the drainage tube II 2, the channel III 23 is arranged between the channel II 22 and the inner wall of the drainage tube II 2 (as shown in figure 4), and the near end of the channel III 23 is a blind end (the near end is the end close to the drainage tube I1);

the drainage tube III 3 is a five-channel drainage tube, a channel IV 31, a channel V32, a channel VI 33, a channel VII 34 which are communicated with the channel II 22 and a channel VIII 35 which is communicated with the channel III 23 are arranged in the drainage tube III 3, the channel V32, the channel VI 33, the channel VII 34 and the channel VIII 35 are arranged between the channel IV 31 and the inner wall of the drainage tube III 3 (as shown in figures 5 and 6), and the head ends of the channel V32, the channel VI 33 and the channel VII 34 are blind ends; the drainage tube III 3 is a body part of the drainage tube;

the outer wall of the drainage tube III 3 is concave, and is sequentially sleeved with an intussusception sacculus I36, a sacculus II 37 and a sacculus III 38 from inside to outside, two ends of the sacculus I36, the sacculus II 37 and the sacculus 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 communicated with the channel V32, the channel VI 33 and the channel VII 34; the tube wall is the tube wall wrapped by the saccule on the drainage tube III 3; the head ends of the channel V32, the channel VI 33 and the channel VII 34 are respectively communicated with the saccule I36, the saccule II 37 and the saccule III 38; wherein the head end of the channel V32 is communicated with the balloon I36 through a through hole I, the head end of the channel VI 33 is communicated with the balloon II 37 through a through hole II, and the head end of the channel VII 34 is communicated with the balloon III 38 through a through hole III;

the drainage tube IV 4 is a five-channel drainage tube, a channel IX 41, a channel X42, a channel XI 43, a channel XII 44 and a channel XIII 45 are arranged in the drainage tube, the channel IX 41 is communicated with the channel IV 31, the channel XIII 45 is communicated with the channel VIII 35, and the channel X42, the channel XI 43 and the channel XII 44 are respectively communicated with the channel V32, the channel VI 33 and the channel VII 34; the passages X42, XI 43, XII 44 and XIII 45 are arranged between the passage IX 41 and the inner wall of the draft tube IV 4 (as shown in FIG. 7); the tail ends of the passages X42, XI 43, XII 44 and XIII 45 are blind ends; the drainage tube IV 4 is the tail part of the drainage tube;

a single-channel connector I46, a connector II 47, a connector III 48 and a connector IV 49 are arranged on the tube wall of the drainage tube IV 4 and are respectively communicated with the tail ends of the channel X42, the channel XI 43, the channel XII 44 and the channel XIII 45; a connector V410 communicated with the channel IX 41 is arranged in the middle of the bottom end of the drainage tube IV 4;

the surfaces of the connector I46, the connector II 47, the connector III 48, the connector IV 49 and the connector V410 are provided with single-channel valves, and the surface of the outer wall is provided with a spiral groove;

resistance blocks are arranged on two sides of the head end of the supporting tube 5 and are connected with the inner wall of the channel I11 in a matched mode; the supporting tube 5 is a single-channel metal tube, the body is cylindrical, a single-channel connecting cap is arranged at the tail end of the supporting tube, a spiral groove I is formed in the inner wall of the connecting cap, and the spiral groove I is connected with a spiral groove in the outer wall of the connector V410 in a matched mode; the body of the support tube 5 is inserted into a channel in the connector V410 and penetrates out of the channel I11.

The length of the drainage tube is 40cm, and the tube diameter is 8-12 Fr.

The maximum diameter of the head end saccule 21 is 2cm when the head end saccule 21 is full, and the head end saccule 21 is elliptic after being full;

the upper end and the lower end of the head end saccule 21 are respectively fixed with the tube wall of the drainage tube II 2 through a metal ring I24 and a metal ring II 25.

The length of the balloon I36 is 35cm, the balloon II 37 is 1cm longer than the balloon I36, and the balloon III 38 is 1cm longer than the balloon II 37;

the expansion diameters of the balloon I36, the balloon II 37 and the balloon III 38 are respectively 12Fr, 14Fr and 16Fr, or 18Fr, 20Fr and 22Fr, or 24Fr, 26Fr and 28 Fr;

the head ends of the saccule I36, the saccule II 37 and the saccule III 38 are flush and are fixed with the tube wall of the drainage tube III 3 through a metal ring III 39;

the tail ends of the saccule I36, the saccule II 37 and the saccule III 38 are respectively fixed with the tube wall of the drainage tube III 3 through a metal ring IV 310, a metal ring V311 and a metal ring VI 312.

During clinical operation, a guide wire is firstly placed into the bladder through the external urethral orifice, the multistage urethral stricture dilatation type drainage tube provided with the support tube is placed into the bladder under the guide of the guide wire, the connector I46 is connected with an injector or a pressure pump 411, physiological saline or air containing contrast agent is injected to fill the head end saccule 21, and the connector I46 is closed. The connector II 47 is connected with an injector or a pressure pump 411, physiological saline containing a contrast agent is gradually injected, the cylindrical expansion air bag is slowly filled to expand the urethra, then the connector III 48 and the connector IV 49 are connected with the injector or the pressure pump 411, physiological saline containing the contrast agent is gradually injected, the air bag II 37 and the air bag III 38 are slowly filled, and the air bag II 37 and the air bag III 38 with larger diameters are used for expanding the urethra; the connector V410 is connected with a drainage bag for draining urine. By adopting the scheme of expanding the urethral stricture and urinating, the invention can increase the stricture expanding range, reduce the times of replacing the drainage tube and shorten the course of disease, and has low manufacturing cost.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-stage urethral stricture dilatation type drainage tube with a balloon is characterized by comprising: 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 with one another from head to tail;

the drainage tube I (1) is conical and is a single-channel drainage tube, and a channel I (11) is arranged in the drainage tube I; two oval side holes (12) are formed in the drainage tube I (1), and the two side holes (12) are communicated with the channel I (11) and used for discharging urine;

the drainage tube II (2) is a double-channel drainage tube, a head end sacculus (21) is attached to the drainage tube II, a channel II (22) communicated with the channel I (11) and a channel III (23) communicated with the head end sacculus (21) are arranged in the drainage tube II, and the near end of the channel III (23) is a blind end;

the drainage tube III (3) is a five-channel drainage tube, a channel IV (31), a channel V (32), a channel VI (33), a channel VII (34) and a channel VIII (35) communicated with the channel III (23) are arranged in the drainage tube III (3), 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, an intussusception sacculus I (36), a sacculus II (37) and a sacculus III (38) are sequentially sleeved from inside to outside, two ends of the sacculus I (36), the sacculus II (37) and the sacculus III (38) are conical, and a middle body is cylindrical;

the tube 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 communicated with the channel V (32), the channel VI (33) and the channel VII (34), and the head ends of the channel V (32), the channel VI (33) and the channel VII (34) are respectively communicated with the saccule I (36), the saccule II (37) and the saccule III (38);

the drainage tube IV (4) is a five-channel drainage tube, a channel IX (41), a channel X (42), a channel XI (43), a channel XII (44) and a channel XIII (45) are arranged in the drainage tube IV, the channel IX (41) is communicated with the channel IV (31), the channel XIII (45) is communicated with the channel VIII (35), and the channel X (42), the channel XI (43) and the channel XII (44) are respectively communicated with the channel V (32), the channel VI (33) and the channel VII (34); the tail ends of the channel X (42), the channel XI (43), the channel XII (44) and the channel XIII (45) are blind ends;

a single-channel connector I (46), a connector II (47), a connector III (48) and a connector IV (49) are arranged on the tube wall of the drainage tube IV (4) and are respectively communicated with the tail ends of the channel X (42), the channel XI (43), the channel XII (44) and the channel XIII (45); a connector V (410) communicated with the channel IX (41) is arranged in the middle of the bottom end of the drainage tube IV (4);

the surfaces of the connector I (46), the connector II (47), the connector III (48), the connector IV (49) and the connector V (410) are all provided with single-channel valves, and the surface of the outer wall is provided with a spiral groove;

resistance blocks are arranged on two sides of the head end of the supporting tube (5) and are connected with the inner wall of the channel I (11) in a matched mode; the supporting tube (5) is a single-channel metal tube, the body is cylindrical, a single-channel connecting cap is arranged at the tail end of the supporting tube, a spiral groove I is formed in the inner wall of the connecting cap, and the spiral groove I is connected with the spiral groove in the outer wall of the connector V (410) in a matched mode; the body of the supporting tube (5) is inserted into a channel in the connector V (410) and penetrates out of the channel I (11).

2. The balloon-equipped multistage urethral stricture dilation type drainage tube according to claim 1, wherein the drainage tube has a length of 40cm and a tube diameter of 8-12 Fr.

3. The balloon-equipped multistage urethral stricture dilation type drainage tube according to claim 1 or 2, characterized in that the maximum diameter of the head end balloon (21) when inflated is 2cm, and the head end balloon (21) is elliptical when inflated;

the upper end and the lower end of the head end saccule (21) are respectively fixed with the tube wall of the drainage tube II (2) through a metal ring I (24) and a metal ring II (25).

4. The multigrade urethral stricture dilation type drainage tube with balloon according to claim 1 or 2, characterized in that the length of the balloon i (36) is 35cm, the balloon ii (37) is longer than the balloon i (36) by 1cm, the balloon iii (38) is longer than the balloon ii (37) by 1 cm;

the expansion diameters of the balloon I (36), the balloon II (37) and the balloon III (38) are respectively 12Fr, 14Fr and 16Fr, or 18Fr, 20Fr and 22Fr, or 24Fr, 26Fr and 28 Fr;

the head ends of the saccule I (36), the saccule II (37) and the saccule III (38) are flush and are fixed with the tube wall of the drainage tube III (3) through a metal ring III (39);

the tail ends of the saccule I (36), the saccule II (37) and the saccule III (38) are respectively fixed with the tube wall of the drainage tube III (3) through a metal ring IV (310), a metal ring V (311) and a metal ring VI (312).

5. The balloon-equipped multi-stage urethral stricture dilation type drainage tube according to claim 1 or 2, wherein the connector I (46) is connected with a syringe or a pressure pump (411) and is filled with contrast agent-containing physiological saline to fill the head end balloon (21);

the connector II (47) is connected with an injector or a pressure pump (411), physiological saline containing a contrast agent is gradually injected, and the balloon I (36) is slowly filled to expand the urethra;

the connector III (48) and the connector IV (49) are connected with an injector or a pressure pump (411), physiological saline containing a contrast agent is gradually injected, the balloon II (37) and the balloon III (38) are slowly filled, and the balloon II (37) and the balloon III (38) with larger diameters are used for dilating the urethra;

the connector V (410) is connected with a drainage bag to drain urine.