CN115040764A - Novel urethra dilator - Google Patents

Abstract

A novel urethral dilator comprising: the guide wire is provided with a ball head structure at the head end of the guide wire, and the maximum diameter of the ball head structure is larger than the diameter of the guide wire; the expandable catheter assembly comprises a sleeve-shaped film sleeve, the film sleeve is sleeved on the outer side of the guide wire and wound in the accommodating space, the front end of the film sleeve is adhered to the ball head structure, and the rear end of the film sleeve is provided with an injection port. In the invention, the structure design of the middle channel formed after the thin film sleeve is expanded can avoid the problem that the urethra is damaged by the original hollow dilator. The invention can also ensure that the expander keeps smaller volume and integral strength in the entering process. The thin film sleeve is designed, the volume structure of the dilator is changed through the thin film sleeve, and after the dilator enters a human body to be positioned, the thin film sleeve can be expanded and keeps the structural form of the dilator, so that the middle channel is kept in an open state, and the success rate of catheterization is increased.

Description

A new type of urethral dilator

technical field

The invention relates to the technical field of medical aids, and more particularly, to a novel urethral dilator, which is especially suitable for gynecology and urology.

Background technique

At present, after transurethral surgery in urology, due to the increase of iatrogenic urethral injury and the increase of patients with urethral stricture, patients need to undergo urethral dilation treatment regularly. During clinical operation, the previous solid urethral dilator completely requires the operator to rely on the touch and feel of the urethra. Experience can be used to judge whether the urethral dilator reaches the bladder, but there is no clear evidence whether the urethral dilation process is going the wrong way, resulting in the formation of a false urethra and increasing the trauma of the treatment. In the past, there was a hollow urethral dilator. During the treatment process, the dilator was bent, and the opening of the dilator was too large, which damaged the urethral mucosa and also increased the treatment trauma.

Therefore, there is an urgent need to provide a urethral dilator with good expansion effect, good structural strength, and less trauma.

SUMMARY OF THE INVENTION

(1) Technical problems

The purpose of the present invention is to provide a urethral dilator with a channel structure that has good expansion effect, good structural strength, and is not easy to cause trauma, aiming at the defects and deficiencies of the prior art.

(2) Technical solutions

The present invention provides a novel urethral dilator. In the present invention, the novel urethral dilator includes:

A guide wire, a ball head structure is arranged at the head end of the guide wire, the maximum diameter of the ball head structure is larger than the diameter of the guide wire, and on an axial section perpendicular to the guide wire, the ball head An accommodation space is formed between the structure and the guide wire;

An expandable catheter assembly, the expandable catheter assembly includes a sleeve-shaped film sleeve, the film sleeve is sleeved on the outer side of the guide wire and wound in the accommodating space, the film sleeve The front end of the film sleeve is adhered to the ball head structure, and the rear end of the film sleeve is provided with an injection port for injecting the fluid that expands the film sleeve.

Preferably, in the novel urethral dilator provided by the present invention, an electrical component for changing the voltage of the fluid in the thin-film cannula is provided at the rear end of the thin-film cannula; the fluid is an electrorheological fluid.

Preferably, in the novel urethral dilator provided by the present invention, the guide wire is a titanium alloy guide wire, and the ball head structure is a titanium alloy ball head structure.

Preferably, in the novel urethral dilator provided by the present invention, the ball head structure is arranged at the head end of the guide wire and is an integral structure with the guide wire.

Preferably, in the novel urethral dilator provided by the present invention, the ball head structure is a spherical ball head structure or a fusiform ball head structure; the outer side of the ball head structure is a smooth plane.

Preferably, in the novel urethral dilator provided by the present invention, one end of the film sleeve disposed on the guide wire and close to the ball head structure is the front end of the sleeve, which is located in the middle channel of the film sleeve. The position of the front end of the inner sleeve is provided with a connecting film, the tensile strength of the connecting film is smaller than that of the film sleeve, and the connecting film includes a head end side edge, a tail end side edge and a middle section, The side of the head end is adhered to the ball head structure, the side edge of the tail end is adhered to the film sleeve, and the length of the middle section is smaller than the maximum radius of the ball head structure.

Preferably, in the novel urethral dilator provided by the present invention, the adhesion strength between the side edge of the tail end and the film sleeve is greater than the breaking strength of the connecting film and smaller than the breaking strength of the film sleeve ; The adhesion strength between the side edge of the head end and the ball head structure is less than the breaking strength of the connecting film.

Preferably, in the novel urethral dilator provided by the present invention, the diameter of the guide wire ranges from 2 mm to 3 mm, and the maximum diameter of the ball head structure is larger than the diameter of the guide wire by 0.5 mm to 1 mm.

Preferably, in the novel urethral dilator provided by the present invention, when the film sleeve is in an expanded state, the diameter of the outer side of the film sleeve ranges from 2 mm to 4 mm, and the inner side of the film sleeve is in the range of 2 mm to 4 mm. The diameter ranges from 1 mm to 3 mm, and the difference between the diameter of the outer side surface and the diameter of the inner side surface ranges from 0.5 mm to 1.5 mm.

Preferably, in the novel urethral dilator provided by the present invention, a venturi tube structure is provided at the rear end of the film sleeve.

(3) Beneficial effects

The present invention provides a novel urethral dilator, the novel urethral dilator comprises: a guide wire, a ball head structure is arranged at the head end of the guide wire, and the maximum diameter of the ball head structure is larger than the diameter of the guide wire , on the axial section perpendicular to the guide wire, an accommodation space is formed between the ball head structure and the guide wire; an inflatable catheter assembly, the inflatable catheter assembly includes a sleeve-shaped membrane sleeve The film sleeve is sleeved on the outer side of the guide wire and wound in the accommodating space, the front end of the film sleeve is adhered to the ball head structure, and the rear end of the film sleeve is set There are injection ports for injecting the fluid that expands the thin film sleeve.

Through the above-mentioned structural design, the present invention has achieved the following beneficial effects with respect to the prior art:

1. The novel urethral dilator provided by the present invention can change its overall shape, and maintain a relatively thin diameter during the process of entering the urethra. After entering the human body in place, the film sleeve can be injected with fluid to expand, thereby forming a sleeve with a channel structure in the middle. Tube structure. The invention integrates the advantages of the solid urethral dilator and the hollow urethral dilator, and solves the problem that it is difficult to judge the bleeding and whether it reaches the bladder during the urethral dilation treatment, and at the same time, the structure design of the middle channel formed by the expansion of the film sleeve can avoid the original hollow expansion. In addition, the channel structure (the channel structure formed after the expansion of the film sleeve) solves the problem of difficulty in catheterization or inability to catheterize after the expansion of individual patients caused by the difficulty of inserting the guide wire;

2. Compared with the urethral dilator without channel structure in the prior art, the overall length of the present invention (the overall length of the film sleeve) is improved from a length of 24cm to a length of 44cm, that is, the improvement of the extension of the main body of the 5Fr urethral dilator. The improvement not only prolongs the length of the dilator (the longer the length increases, the wider the scope of application of the dilator), but also ensures that the dilator maintains a small volume during the entry process and ensures the overall strength;

3. The thin film sleeve is designed, and the volume structure of the dilator is changed through the thin film cannula. After the dilator enters the human body for positioning, the thin film cannula can be expanded and expanded and its structural shape can be maintained, so that the middle channel remains open, and the guide is increased. Urine success rate.

Description of drawings

FIG. 1 is a schematic structural diagram of a novel urethral dilator in an embodiment of the present invention.

In Figure 1, the corresponding relationship between component names and reference numerals is:

Guide wire 1, ball head structure 2, film sleeve 3, electrical assembly 4, connecting film 5,

Venturi structure 6.

Detailed ways

The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are intended to illustrate the present invention, but not to limit the scope of the present invention.

In the description of the present invention, unless otherwise stated, "plurality" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer" The orientation or positional relationship indicated by , "front end", "rear end", "head", "tail", etc. are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, not An indication or implication that the referred device or element must have a particular orientation, be constructed and operate in a particular orientation, is not to be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc. are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral connection. Ground connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

Please refer to FIG. 1 , which is a schematic structural diagram of a novel urethral dilator according to an embodiment of the present invention.

The present invention provides a novel urethral dilator. In the prior art, there are two types of urethral dilators, one is a dilator with a catheter channel, and the other is a solid dilator. The solid dilator can ensure the overall high structural strength of the dilator, so it can be made thinner and more convenient to use clinically. A dilator with a catheter channel is to set a slender channel structure on the dilator, and conduct drainage and drainage through the channel structure set on the dilator. However, this dilator is provided with a slender channel structure. The structural strength of the dilator is relatively low, and it is necessary to increase the volume of the dilator to ensure that it meets the requirements for use. However, the increase in the volume of the dilator will increase the difficulty of using the dilator and increase the risk of human trauma.

Aiming at the structural defects of the above two dilators, the present invention provides a urethral dilator with a novel structure, which can change its own volume and maintain a relatively small diameter when entering the human body, which is convenient for entering the human body. After the human body, the diameter can be expanded and a channel structure can be formed, so as to realize the dredging and drainage of body fluids (blood clots or urine) in the human body. The novel urethral dilator provided by the invention is especially suitable for use in gynecology and urology.

Specifically, the structure of the novel urethral dilator provided by the present invention is as follows, including:

Part 1: Guide wire 1.

The guide wire 1 is the structure of the present invention that realizes the novel urethral dilator entering the human body and advancing in the urethra.

The guide wire 1 is a wire-like (thin rod-like) structure with a certain structural strength. Preferably, the guide wire 1 can also have a certain elasticity, so that when entering the urethra and during the process of advancing in the urethra, if the guide wire 1 is in contact with human tissue, When the contact occurs, the guide wire 1 will undergo elastic deformation, thereby reducing the probability of trauma to the human tissue caused by the rigid contact.

In the present invention, the guide wire 1 can be made of titanium alloy material, and the guide wire 1 can also be made of stainless steel material. The diameter of the guide wire 1 ranges from 2 mm to 3 mm, and may specifically be 2.0 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm, and 3.0 mm.

In order to facilitate the entry of the guide wire 1 into the human body, and at the same time, to avoid problems such as scratching and puncturing of human tissue caused by the head of the guide wire 1 contacting the human body, the present invention provides a ball head structure 2 at the head end of the guide wire 1 . The ball head structure 2 is designed according to the size of the guide wire 1 . In the present invention, the maximum diameter of the ball head structure 2 is larger than the diameter of the guide wire 1 by 0.5 mm-1 mm.

The maximum diameter of the ball head structure 2 (the ball head structure 2 can be either a round ball head or a shuttle ball head structure 2) is larger than the diameter of the guide wire 1 (the guide wire 1 is a slender rod of equal diameter). On the axial section of the guide wire 1 , an accommodation space is formed between the ball head structure 2 and the guide wire 1 . A more vivid explanation of the above structure is as follows: the guide wire 1 and the ball head structure 2 are projected on the axis parallel to the guide wire 1, the ball head structure 2 is a circular projection, the guide wire 1 is a circular projection, and the ball head structure 2 is a circular projection. The projection of the head structure 2 completely covers the projection of the guide wire 1, and the projection of the ball head structure 2 is concentric with the projection of the guide wire 1. There is an annular area between the outer edge of the projection of the ball head structure 2 and the outer edge of the projection of the guide wire 1. The annular area can be understood as the projection of the accommodation space.

In use, one end of the guide wire 1 provided with the ball head structure 2 enters the human bladder from the urethral opening of the human body through the urethra, thereby realizing the expansion of the entire urethra. The other end of the guide wire 1 (the end without the ball head structure 2) is located outside the human body to facilitate the extraction of the guide wire 1 (from the film sleeve 3). The force causes the guide wire 1 to perform a small reciprocating motion, so as to break the plug (blood clot) in the urethra.

Specifically, the guide wire 1 is a titanium alloy guide wire 1 , and the ball head structure 2 is a titanium alloy ball head structure 2 .

Specifically, the ball head structure 2 is disposed at the head end of the guide wire 1 and is an integral structure with the guide wire 1 . Further, the ball head structure 2 is a round ball head structure 2 or a shuttle ball head structure 2, and the outer side surface of the ball head structure 2 is a smooth plane.

In the present invention, the head end of the guide wire 1 is provided with a ball head structure 2, and the outer side of the ball head structure 2 should be a smooth surface structure, so that when it is in contact with human tissue, it will not cause damage to human tissue. At the same time, the guide wire 1 When moving in the urethra, the urethral tube wall can also well guide the ball head structure 2 . Specifically, the ball head structure 2 has two preferred structures, one is a round ball head structure 2, and the other is a shuttle-shaped structure. When the shuttle-shaped structure is adopted, both tips of the ball head structure 2 are spherical structures. One of the tips is fixedly connected with the guide wire 1 (a small hole is punched at the tip according to the diameter of the guide wire 1, the end of the guide wire 1 is inserted into the small hole and then welded, and the connection part is polished smooth).

In the embodiment in which the guide wire 1 and the ball head structure 2 are made of titanium alloy materials, the outer surfaces of the guide wire 1 and the ball head structure 2 do not need to be provided with any coating, and only need to be mirror-polished. .

Part II: Expandable catheter assembly.

An expandable catheter assembly is an assembly that changes its volume (mainly its diameter) by controlled deformation.

Specifically, the expandable catheter assembly includes a sleeve shape (the sleeve shape refers to the overall shape of the film sleeve 3 after being injected with fluid and expanded, and the use of the sleeve shape can realize the expansion and expansion of the urethral tube, and can also form a channel structure, The film sleeve 3 (the film sleeve 3 refers to the sleeve structure made of polymer film material, the film sleeve 3 is preferably made of medical PVC material, and its overall size is small , can be manufactured by Seiko). The film sleeve 3 is made of an inelastic (non-elastic) film material, which includes an inner film and an outer film, the inner film has a straight cylindrical structure, the outer film has a straight cylindrical structure, and the outer film has a straight cylindrical structure. The diameter of the inner layer film is larger than the diameter of the inner layer film, the inner layer film is sleeved into the outer layer film, and then both ends are sealed, and there are multiple small-sized fan-shaped structures at the seal (the fan-shaped structure can be assembled into a circular structure), so that After the film sleeve 3 is filled with fluid and expanded, it can be limited in a fan-shaped structure so that the entire film sleeve 3 maintains a tubular structure. Further, in the present invention, a support rib parallel to the guide wire 1 can also be provided on the surface of the inner layer membrane (the side facing the outer side).

The film sleeve 3 is sleeved on the outer side of the guide wire 1 and wound up (the film sleeve 3 is equivalent to two flexible films in the state of discharging fluid, and can be wound arbitrarily) in the accommodating space, the front end of the film sleeve 3 and the ball head The structure 2 is adhered (when using the adhesion method to connect, the ball head structure 2 can be separated from the film sleeve 3 by applying a certain force), and the rear end of the film sleeve 3 is provided with an injection port for injecting the film sleeve. 3 Expanded fluid. The injection port is a member made of hard plastic or rubber material, which is used for docking with a container (such as a syringe) containing fluid, and the container exerts pressure on the fluid, so as to press the fluid into the film sleeve 3 to realize the film Expansion of casing 3.

After the film sleeve 3 is expanded, a channel structure can be formed in the middle for draining the body fluids out of the human body. After the expansion of the film sleeve 3, the structural strength is relatively low. In order to increase the overall structural strength of the film sleeve 3 after the expansion , the present invention proposes the following two embodiments: 1. Increase the pressure of the fluid in the thin film sleeve 3; 2. Change the properties of the fluid (liquid or gas) to make it solid. For the first mode, the present invention can select any fluid that is harmless to the human body, such as silicone oil, distilled water, etc. In the first mode, the structural strength of the film sleeve 3 is required to be high. For the second method, the present invention defines the fluid as electrorheological fluid. Electrorheological fluid is a new type of material. It is liquid in normal state (in the state of no voltage loading), and can become solid when voltage is loaded, and its properties change. does not change its shape. Based on the above-mentioned second method, the present invention is provided with an electrical component 4 at the rear end of the film sleeve 3 for changing the fluid voltage in the film sleeve 3 .

Further, the film sleeve 3 is arranged on the guide wire 1 and one end close to the ball head structure 2 is the front end of the sleeve. The breaking strength of the film sleeve 3 is smaller than that of the film sleeve 3. The connecting film 5 includes a head end side edge, a tail end side edge and a middle section. The tube 3 is stuck, and the length of the middle section is less than the maximum radius of the ball head structure 2 .

In the above-mentioned structural design, the present invention sets the connection film 5, and proposes the following two limitations for the connection film 5: 1. For the material of the connection film 5, in combination with the film sleeve 3, the film sleeve 3 and the connection film 5 are limited. Carry out material selection, so that the breaking strength of the connecting film 5 is less than the breaking strength of the film sleeve 3, so that when the guide wire 1 is pulled out of the film sleeve 3, the connecting film 5 is first torn off, so that the ball head structure 2 and the film sleeve are The tube 3 is separated; 2. For the size of the connecting film 5, after the side of the head end is adhered to the ball head structure 2 and the side of the tail end is adhered to the film sleeve 3, the length of the middle section of the connecting film 5 is smaller than that of the ball head structure 2 In this way, after the connecting film 5 is torn off, the connecting film 5 will not leak out at the head end of the film sleeve 3, so that the body fluid in the human body can smoothly enter the film sleeve 3 from the head end of the film sleeve 3 out of the middle pipe.

Further, the adhesion strength between the side of the tail end and the film sleeve 3 is greater than the breaking strength of the connecting film 5 and less than the breaking strength of the film sleeve 3, and the adhesion strength between the side of the head end and the ball head structure 2 is smaller than that of the connecting film. 5 tensile strength. In the above-mentioned structural design, when the guide wire 1 is pulled out, the adhesive structure is disconnected first, and if the disconnection fails, the connecting film 5 is torn off.

Specifically, when the film sleeve 3 is in an expanded state, the diameter of the outer side of the film sleeve 3 ranges from 2mm to 4mm (the specific dimensions of the outer side diameter are 2.0mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, 3.0mm, 3.2mm, 3.4mm, 3.6mm, 3.8mm, 4.0mm), the diameter of the inner side of the film sleeve 3 is 1mm-3mm (specific dimensions of the outer side diameter are 1.0mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm , 2.0mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, 3.0mm), the difference between the diameter of the outer side and the inner side is 0.5mm-1.5mm.

Part III: Venturi Structure 6.

As another key point of the present invention, the present invention is provided with a venturi tube structure 6 at the rear end of the film sleeve 3 .

Specifically, the Venturi tube structure 6 includes a Venturi tube main body, and a butting port is provided at the narrow-diameter section of the Venturi tube main body, and at the same time, the present invention provides a rigid tubular structure at the tail end of the film sleeve 3, so that Then, it can be installed on the rigid tubular structure at the end of the film sleeve 3 through the docking port provided on the main body of the Venturi tube. A negative pressure can be formed in the middle channel structure of the film sleeve 3 through the Venturi tube, so as to suck out body fluids, plugs and the like.

The present invention provides a novel urethral dilator, the novel urethral dilator comprises: a guide wire 1, a ball head structure 2 is arranged at the head end of the guide wire 1, and the maximum diameter of the ball head structure 2 is larger than the diameter of the guide wire 1, On the axial section perpendicular to the guide wire 1, an accommodation space is formed between the ball head structure 2 and the guide wire 1; the expandable catheter assembly includes a sleeve-shaped film sleeve 3, and the film sleeve 3 is sleeved on the outside of the guide wire 1 and wound in the accommodating space, the front end of the film sleeve 3 is adhered to the ball head structure 2, and the rear end of the film sleeve 3 is provided with an injection port for injecting the film sleeve 3. expanding fluid.

Through the above-mentioned structural design, the present invention has achieved the following beneficial effects with respect to the prior art:

1. The novel urethral dilator provided by the present invention can change its overall shape, maintain a relatively thin diameter in the process of entering the urethra, and after entering the human body in place, the film sleeve 3 can be injected with fluid to expand, thereby forming a middle part with a channel structure. Casing structure. The invention combines the advantages of a solid urethral dilator and a hollow urethral dilator, and solves the problem that it is difficult to judge the bleeding and whether it reaches the bladder during the urethral dilation treatment. At the same time, the structure design of the middle channel formed by the expansion of the film sleeve 3 can avoid the original hollow The dilator damages the urethra, and the channel structure (the channel structure formed after the expansion of the film sleeve 3) solves the problem of difficulty in catheterization or inability to catheterize individual patients after dilation caused by the difficulty in inserting the guide wire 1;

2. Compared with the urethral dilator without channel structure in the prior art, the whole of the present invention (the overall length of the film sleeve 3) is improved from a length of 24cm to a length of 44cm, that is, the improvement of the extension of the main body of the 5Fr urethral dilator, This improvement not only prolongs the length of the dilator (the longer the length increases, the wider the scope of application of the dilator), but also ensures that the dilator maintains a small volume during the entry process and maintains the overall strength;

3. The film sleeve 3 is designed, and the volume structure of the dilator is changed through the film sleeve 3. After the dilator enters the human body for positioning, the film sleeve 3 can be expanded and expanded and its structural shape can be maintained, so that the middle channel remains open. Increased success rate of catheterization.

The embodiments of the present invention are presented for purposes of illustration and description, and are not intended to be exhaustive or to limit the invention to the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to better explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use.

Claims (10)

1. a novel urethral dilator, is characterized in that, comprises: A guide wire (1), a ball head structure (2) is provided at the head end of the guide wire, the maximum diameter of the ball head structure is larger than the diameter of the guide wire, and the axial section perpendicular to the guide wire is provided On the top, an accommodation space is formed between the ball head structure and the guide wire; An expandable catheter assembly, the expandable catheter assembly includes a sleeve-shaped film sleeve (3), the film sleeve is sleeved on the outside of the guide wire and wound in the accommodating space, the The front end of the film sleeve is adhered to the ball head structure, and the rear end of the film sleeve is provided with an injection port for injecting the fluid for expanding the film sleeve. 2. The novel urethral dilator according to claim 1, characterized in that, An electrical component (4) for changing the voltage of the fluid in the film sleeve is arranged at the rear end of the film sleeve; The fluid is an electrorheological fluid. 3. The novel urethral dilator according to claim 1, characterized in that, The guide wire is a titanium alloy guide wire, and the ball head structure is a titanium alloy ball head structure. 4. The novel urethral dilator according to claim 3, characterized in that, The ball head structure is arranged at the head end of the guide wire and is an integral structure with the guide wire. 5. The novel urethral dilator according to claim 4, characterized in that, The ball head structure is a round ball head structure or a shuttle ball head structure; The outer side of the ball head structure is a smooth plane. 6. The novel urethral dilator according to claim 1, characterized in that, The film sleeve is arranged on the guide wire and one end close to the ball head structure is the front end of the sleeve, and a connecting film (5) is arranged in the middle channel of the film sleeve and at the position of the front end of the sleeve, The tensile strength of the connecting film is smaller than the tensile strength of the film sleeve, the connecting film includes a head end side edge, a tail end side edge and a middle section, the head end side edge and the ball head structure Adhesion, the side edge of the tail end is adhered to the film sleeve, and the length of the middle section is less than the maximum radius of the ball head structure. 7. The novel urethral dilator according to claim 6, characterized in that, The adhesion strength between the side edge of the tail end and the film sleeve is greater than the breaking strength of the connecting film and smaller than the breaking strength of the film sleeve; The adhesion strength between the side edge of the head end and the ball head structure is smaller than the breaking strength of the connecting film. 8. The novel urethral dilator according to claim 1, characterized in that, The diameter of the guide wire ranges from 2 mm to 3 mm, and the maximum diameter of the ball head structure is larger than the diameter of the guide wire by 0.5 mm to 1 mm. 9. The novel urethral dilator according to claim 1, characterized in that, In the expanded state of the film sleeve, the diameter of the outer side of the film sleeve is in the range of 2mm-4mm, the diameter of the inner side of the film sleeve is in the range of 1mm-3mm, and the diameter of the outer side is the same as the diameter of the outer side. The diameter difference of the inner side surface ranges from 0.5mm to 1.5mm. 10. The novel urethral dilator according to any one of claims 1 to 9, characterized in that, A venturi tube structure (6) is arranged at the rear end of the film sleeve.

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