CN112043943B

CN112043943B - Catheter for urological department

Info

Publication number: CN112043943B
Application number: CN202011014788.3A
Authority: CN
Inventors: 不公告发明人
Original assignee: Shenzhen Kyb Technology Development Co ltd
Current assignee: Shenzhen Kyb Technology Development Co ltd
Priority date: 2020-09-24
Filing date: 2020-09-24
Publication date: 2022-05-20
Anticipated expiration: 2040-09-24
Also published as: CN112043943A

Abstract

The invention provides a urinary catheter for urology department, which comprises a rubber tube for conveying urine, wherein the rubber tube is provided with a hard control tube section, and a urethral catheterization hole communicated with the rubber tube is formed in the control tube section; this catheterization hole intersects perpendicularly with the valve opening along the blind hole structure of control pipeline section radial arrangement, and the hole bottom part of valve opening is the globular cavity structure of inflation the drill way department of valve opening still is equipped with towards the horn hole cover that the inside degree of depth direction of valve opening extends, the big port of this horn hole cover is as the drill way of valve opening, the small port links to each other with the coaxial an organic whole of open end of the tubulose expansion pipe of circular examination, this expansion pipe is including being the bobbin base section of spherical shell form and the tubulose body section of circle, the elasticity of body section is weaker than the elasticity of bobbin base section, so that when being filled into the air in the expansion pipe, the bobbin base section is the spherical of inflation and fills in the globular cavity structure at valve opening hole bottom, and this body section then cuts off the catheterization hole and seals. This catheter for urological department uses extremely conveniently, and the operation is felt well.

Description

Catheter for urological department

Technical Field

The invention relates to the field of medical treatment, in particular to a urinary catheter for urology.

Background

In clinical medicine, urinary catheters for urology are used in clinical practice to insert into the urinary bladder via the urethra to draw urine in order to relieve urinary retention, to take uncontaminated urine specimens for examination, to measure residual urine, to measure the cold or heat sensation, volume, and pressure of the urinary bladder, and to inject contrast agents or drugs to aid diagnosis or treatment. The operator stands on the right side of the patient, wears sterile gloves, uses sterile water or benzalkonium bromide to sterilize perineum and urethral orifice, the front end of the urinary catheter is stained with sterile lubricating oil, holds the penis with the left hand, if the patient is a female patient, the operator separates the labia minora with the thumb and the index finger of the left hand to expose the urethral orifice, and inserts the urinary catheter into the bladder until the urinary catheter has urine flowing out. The prior urinary catheter for the urology department generally discharges all urine at one time when in use, and a clamp is generally adopted to directly clamp the urinary catheter for the urology department to close the urinary catheter for the urology department when the urinary catheter for the urology department is opened and closed, the method mainly considers the convenience and the rapidness of opening and closing, but the channel in the urinary catheter for the urology department is difficult to effectively and thoroughly close, and the urine still flows out; or the valve is closed by rotating a knob cover on the valve, the operation of the mode is relatively complex, the urinary catheter is not closed timely enough, and the urinary catheter is generally small, and the knob cover is also small, so that the user is difficult to hold and screw by hands. Therefore, the conventional urinary catheter is inconvenient in both the opening and closing operation and the flow rate adjustment, and is poor in the operation comfort.

Disclosure of Invention

The invention aims to solve the problems that the urinary catheter for the urology department is inconvenient to open and close and adjust flow and poor in operation comfort in the prior art.

In order to realize the purpose, the invention adopts the following technical scheme:

a urinary catheter for urology department comprises a rubber tube for conveying urine, wherein a hard control tube section is arranged on the rubber tube, and a urethral catheterization hole communicated with the rubber tube is formed in the control tube section; the urethral catheterization hole is vertically intersected with a valve hole of a blind hole structure which is radially arranged along a control pipe section, the bottom part of the valve hole is of an expanded spherical cavity structure, a flared hole sleeve which extends towards the depth direction inside the valve hole is also arranged at the orifice of the valve hole, the large port of the flared hole sleeve is used as the orifice of the valve hole, the small port is coaxially and integrally connected with the opening end of a round test-tube-shaped expansion pipe, the expansion pipe comprises a spherical shell-shaped pipe bottom section and a round tubular body section, the elasticity of the body section is weaker than that of the pipe bottom section, so that when air is filled into the expansion pipe, the pipe bottom section is of an expanded spherical shape and is filled in the spherical cavity structure at the bottom of the valve hole, and the body section cuts off and seals the urethral catheterization hole;

and the outer wall of the control pipe section around the orifice of the valve hole is connected with an inflatable ball, and the inflatable ball can press air into the expansion pipe through the orifice of the valve hole.

Preferably, a closing plug for sealing the outlet end of the rubber tube is inserted into the outlet end of the rubber tube; the inflatable ball can rotate in a vertical plane, and the orifice of the valve hole is communicated with the air outlet hole of the inflatable ball which rotates to the upper limit position; a vent hole is also arranged in the pipe wall of the control pipe section between the inflatable ball and the outlet end of the rubber pipe, one end of the vent hole can be communicated with the air outlet hole which rotates to the lower limit position, and the port at the other end is tightly attached to the matching surface of the sealing block and the end surface of the outlet end of the rubber pipe;

the inflatable ball comprises a left spherical shell and a right spherical shell, the right spherical shell is made of an elastic expandable material, the left spherical shell is made of a hard material, the surface of the left spherical shell is matched with a boss on the outer wall of the control pipe section in a movable sealing mode to enable the left spherical shell to rotate in place in a vertical plane by an angle, the surface of the left spherical shell leans against the upper end and the lower end of the left spherical shell to respectively have a convex limiting part, the upper limiting part and the lower limiting part are arranged on the upper side surface and the lower side surface of the boss to be in contact, the air outlet is respectively corresponding to the lower limiting position and the upper limiting position, and only is communicated with the air vent when located at the lower limiting position, and only is communicated with the valve hole when located at the upper limiting position.

Preferably, the diameter of the urethral catheterization hole is not more than two-thirds of the diameter of the spherical cavity structure at the bottom of the valve hole.

Preferably, in a natural state, the outer wall of the expansion pipe is attached to the inner wall of the valve hole.

Preferably, the inner surface and the outer surface of the joint between the tube bottom section and the body section are respectively provided with an annular groove.

Further, the cross section of the annular groove is semicircular.

Further, the radius of the annular groove on the outer wall is smaller than the radius of the annular groove on the inner wall.

Furthermore, the circle center of the semicircle of the cross section of the annular groove is positioned on the connecting surface between the tube bottom section and the body section.

Compared with the prior art, the invention has the following beneficial effects: firstly, the expansion pipe of the rubber pipe for controlling the urine conveying can be made smaller because of expansion and contraction, the expansion pipe is arranged at the control pipe section on the rubber pipe, the size of the control pipe section can be as large as that of the rubber pipe, and the structure of the control valve formed by the expansion pipe can be arranged close to the outlet end of the rubber pipe, so that medical personnel can conveniently carry the urine bag by hand during the catheterization, and can also vacate the hand to press the inflatable ball to adjust and control the opening and closing of the catheterization, and the operation is very convenient. In addition, as for the actions of the switch and the flow control adjustment, the extrusion type action mode of holding the inflatable ball by hand is simpler and more convenient than the mode of rotating the knob or continuously shifting the roller, and the operation contact feeling is smooth and skin-friendly. In a natural state, the urinary catheter for the department of urology is in a normally open state, when the urinary catheter for the department of urology is installed, medical staff can press the inflatable ball with the hand to enable the inflatable tube to expand and extend out, and cut off the urinary catheter for the department of urology and temporarily close the urinary catheter, meanwhile, due to the spherical cavity structure at the bottom end of the valve hole, the bottom end of the inflatable tube expands to be a sphere and then fills the cavity at the bottom of the valve hole, when the inflatable ball is pressed by the hand, an airbag component formed by connecting the inflatable tube and the inflatable ball keeps a structure with two large ends and a small middle part, and the inflatable tube is more firm and stable in the valve hole after being expanded to a certain degree; and after the cavity is full of by the socle section of inflation pipe bottom the valve body, further extrusion is aerifyd the ball and can be made the body section of the inflation pipe that is in catheterization hole and valve opening cross department and expand deformation from top to bottom, further firmly seals above-mentioned cross department, realizes stably that the effect of closing, and the operation comfort is good. In addition, because the expansion pipe made of the elastic material has a certain buffer effect when urine is instantly gushed out, the impact sense of urgency during urination can be reduced to a certain extent for a patient, and the patient is more comfortable.

In the preferred manufacturing details, when the outlet end of the rubber tube is inserted into the sealing plug, the inflatable ball is of a self-rotating mounting structure and can freely rotate for a certain angle in a vertical plane, so that the air outlet of the inflatable ball can be changed in position to be respectively communicated with the valve hole and the vent hole so as to respectively drive the sliding plate to slide and the sealing plug to automatically fall off, and the pneumatic sealing device is more convenient.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

FIG. 1 is a schematic structural diagram of one embodiment of the present invention;

FIG. 2 is a schematic view of one configuration of the expansion pipe;

FIG. 3 is another schematic structural view of the expansion tube;

FIG. 4 is an enlarged view of the structure of FIG. 1 shown attached to a mounting tube;

FIG. 5 is a schematic view of the mating structure of the marker post and the reference post on the mounting tube;

FIG. 6 is a schematic cross-sectional view of a sliding connection between the left spherical shell and the boss of the control tube section;

FIG. 7 is a schematic view of a connection state at I in FIG. 1;

FIG. 8 is a schematic view of a compression device for the inflatable ball.

The device comprises a control pipe section 1, a boss 101, a valve hole 102, a bell-mouthed sleeve 103, an expansion pipe 2, a body section 201, a pipe bottom section 202, an installation pipe 3, a sliding block 4, a guide rod 5, a pull ring 6, a sealing plug 7, a left spherical shell 801, a right spherical shell 802, a sliding plate 9, an arc-shaped plate 10, a marker post 12, a reference rod 13, a sponge block 14, a pressure spring 15, a magnetic block 16, a limiting part 18, a vent hole 19, an air outlet hole a, an elastic sheet 20, a pressure plate 210, a spring sheet 220, a connecting plate 230, a top spring 240, a blind cavity 2301 and an annular groove 20201.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the functions of the invention clearer and easier to understand, the invention is further explained by combining the drawings and the detailed implementation mode:

as shown in fig. 1, the present embodiment proposes a urinary catheter including a hose for transporting urine. The rubber tube is provided with a hard control tube section 1, the control tube and the rubber tube are integrally formed, the hardness is preferably slightly hard, and the thickness of the control tube is consistent with that of the rubber tube. The control pipe section 1 is internally provided with a urethral catheterization hole communicated with the rubber tube, the urethral catheterization hole is vertically intersected with a valve hole 102 of a blind hole structure which is arranged along the radial direction of the control pipe section 1, and the bottom part of the valve hole 102 is of an expanded spherical cavity structure. A flared hole sleeve 103 extending towards the depth direction inside the valve hole 102 is further arranged at the opening of the valve hole 102, namely, the inner hole is in a flared hole shape, the large port of the flared hole sleeve 103 is used as the opening of the valve hole 102, and the small port is coaxially and integrally connected with the opening end of the circular test tube-shaped expansion pipe 2. As shown in fig. 2, the expansion tube 2 of the present embodiment includes a spherical shell-shaped tube bottom section 202 and a circular tube-shaped body section 201, and the elasticity of the body section 201 is weaker than that of the tube bottom section 202, so that when the expansion tube 2 is filled with air, the tube bottom section 202 is in an expanded spherical shape and is filled in a spherical cavity structure at the bottom of the hole of the valve hole 102, and the body section 201 blocks and seals the urethral catheterization hole, thereby realizing on-off control of the urethral hole. Meanwhile, in the embodiment, the outer wall of the control pipe section 1 around the orifice of the valve hole 102 is connected with an inflatable ball, and the inflatable ball can press air into the expansion pipe 2 through the orifice of the valve hole 102, so that the function of the expansion pipe 2 for controlling the on-off of the urethral catheterization hole is realized. When using, when installing catheter for the urological department, can hold the inflatable ball to make expansion pipe 2 inflation and seal the catheterization hole, flow out in catheter for the urological department suddenly from urine when preventing catheter for the urological department from pegging graft, cause the pollution, and when needing to derive the urine, loosen inflatable ball can, simple convenient, very easily operation.

Preferably, the diameter of the urethral catheterization hole in the embodiment is not more than two thirds of the diameter of the spherical cavity structure at the bottom of the valve hole 102, so as to better fix the expanded expansion tube 2. In addition, in a natural state, the outer wall of the expansion pipe 2 is attached to the inner wall of the valve hole 102, and the tightness after expansion is improved. Furthermore, as shown in fig. 3, the inner and outer surfaces of the joint between the tube bottom section 202 and the body section 201 are each provided with an annular groove 20201 to fully expand the tube bottom end into a spherical shape, and to enhance this effect, the annular groove 20201 has a semicircular cross section. And more preferably the radius of the annular groove 20201 on the outer wall is smaller than the radius of the annular groove 20201 on the inner wall. In addition, the center of the semicircle of the cross section of the annular groove 20201 is located at the connection surface between the bottom section 202 and the body section 201, in order to optimize the spheroidal expansion characteristics of the bottom section 202.

In specific implementation, the inflatable ball includes a left spherical shell 801 and a right spherical shell 802, and the right spherical shell 802 is made of an elastically expandable material so as to be deformed by pressing and compress air. And left spherical shell 801 is made for the stereoplasm material, mainly used inflatable ball's erection joint, promptly: the surface of the left spherical shell 801 is matched with the boss 101 on the outer wall of the control pipe section 1 in a dynamic sealing mode to enable the spherical shell to rotate in place by an angle in a vertical plane, the surface of a left sphere is close to the upper end and the lower end of the left sphere and is provided with a convex limiting part 18, the limiting part above and the limiting part below are in contact with the upper side surface and the lower side surface of the boss 101, the air outlet a corresponds to the lower limiting position and the upper limiting position respectively, the air outlet a is located at the lower limiting position and is communicated with the air vent 19, and the air outlet a is located at the upper limiting position and is communicated with the valve hole 102 to independently realize the sliding of the sliding plate 9 and the ejection and separation of the sealing plug 7, and flexibly control the opening and closing in a control pipeline and the opening and closing of a rubber pipe outlet end.

In addition, because the control tube section 1 in this embodiment is normally open in a natural state, if a urine test sample is to be collected, it is necessary to prevent a section of the rubber tube near the outlet end from being contaminated, and therefore, the sealing plug 7 must be removed when the rubber tube is used after the sealing plug is inserted into the outlet end of the rubber tube to seal the rubber tube.

In the automatic disassembling structure of the sealing plug 7 in the embodiment, after the inflatable ball is released, the sliding plate 9 resets, and urine can flow out from the outlet end of the rubber tube after the control tube section 1 is restored to be opened. It should be noted that, because the rubber tube itself is smaller, the size of the sealing block 7 is also very small, so that the adoption of the inflatable direct jacking is a more convenient and environment-friendly mode, people do not need to pull the small sealing block 7 by hands and the sealing block can not contact with the end opening of the rubber tube, and pollution is prevented. In addition, preferably, the air outlet end of the air vent 19 can be made into a tile-shaped arc-shaped cavity if necessary, so as to increase the contact area with the sealing plug 7 and circumferentially push the sealing plug more completely. For the sealing plug 7, there is also a preferable design structure to adapt to the airflow pushing opening of the vent hole 19, that is, the thickness of the sealing plug 7 at the position of the outlet end of the vent hole 19 is thicker than the thickness of the part of the sealing plug 7 inserted into the rubber tube, and preferably, the center of gravity of the sealing plug 7 is exactly on the same vertical line with the center of the outlet end of the vent hole 19, for example, a zigzag structure is made.

When the connection structure between the installation inflatable ball and the boss 101 of the control pipe section 1 is manufactured, as shown in fig. 1 and fig. 6, the boss 101 is arranged in a protruding manner towards the radial direction of the control pipe section 1 towards the outer side, the end face of the free end of the boss 101 is a concave surface matched with the left spherical shell 801, and a T-shaped sliding groove is formed in the concave surface; the surface of the left spherical shell 801 is provided with a sliding strip with a T-shaped cross section, the sliding strip is positioned in the T-shaped sliding groove and is in sliding fit with the T-shaped sliding groove, and the air outlet a penetrates through the sliding strip to realize sliding connection between the inflatable ball and the control pipe section 1 and enable the inflatable ball to rotate in a vertical plane.

Further, in order to maintain the connection state between the position-limiting part 18 and the side surface of the boss 101 at the two extreme positions, in a specific implementation, it is preferable that one magnet is provided on both upper and lower sides of the boss 101, and both the position-limiting parts 18 on the left spherical shell 801 are magnetic bodies that can be attracted by the magnets. As shown in fig. 7, a pair of S-shaped elastic pieces 20 are connected to each limiting portion 18, the two elastic pieces 20 are disposed opposite to each other, two concave bending portions of the elastic pieces 20 are preferably in a spoon-shaped structure, a vase-shaped groove adapted to the side surface of the boss 101 is formed in the side surface of the boss 101, and when the two elastic pieces 20 are inserted into the groove in an extruding manner, the limiting portions 18 are connected to the boss 101.

On the other hand, in the present embodiment, if it is required to more clearly and intuitively know whether the expansion pipe 2 is expanded and moved in place, that is, whether the pipe bottom section 202 is filled with the cavity at the bottom of the valve hole 102, preferably, a mounting pipe 3 is fixedly connected to one side of the control pipe section 1, that is, the mounting pipe 3 is fixedly connected to the side opposite to the inflatable ball, one end of the mounting pipe 3 is open and covers the outer side wall of the control pipe section 1 and is fixed thereto, and the other end is closed. Simultaneously, this embodiment still includes the valve plate, the valve plate includes integrative slider 4 and slide 9 that link to each other, slider 4 sliding fit installs in installation pipe 3 and with be connected with pressure spring 15 that is compression state all the time between the blind end of installation pipe 3 to there is a top push pressure all the time to slider 4 towards the inboard direction of control pipeline section 1. The sliding plate 9 penetrates through the control pipe section 1 in a sliding and sealing mode along the radial direction, a valve hole 102 is formed in the middle of the sliding plate 9, the sliding plate 9 is pushed into a cavity of a spherical structure of the valve hole 102 by the pressure spring 15 in a natural state, an arc-shaped plate 10 is fixedly connected to one end, located at the hole bottom of the valve hole 102, of the sliding plate 9, and the arc-shaped plate 10 can completely return to an arc-shaped strip cavity at the hole bottom of the valve hole 102 when the expansion pipe 2 expands to enter the hole bottom of the valve hole 102.

As a specific implementation detail, one end of a guide rod 5 is further fixedly connected to the free end of the sliding block 4, the other end of the guide rod 5 passes through the closed end of the mounting tube 3 in a sliding fit manner and then extends out of the mounting tube 3, and a pull ring 6 is connected to the extending end of the guide rod, so that whether the sliding performance of the valve plate is good or not can be manually checked.

Preferably, during manufacturing, as shown in fig. 4, a pipe wall on one side of the mounting pipe 3 is provided with a bar hole along the length direction thereof, the bar hole is processed into a rectangle, one end of the bar hole near the free end of the mounting pipe 3 is provided with a reference rod 13, and the reference rod 13 is fixed on the outer surface of the pipe wall of the mounting pipe 3. The sliding block 4 is fixedly connected with a mark post 12 extending out of the strip hole, when the sliding block 4 slides in the installation pipe 3, the expansion pipe 2 expands and moves in place to close and separate the urethral catheterization hole when the mark post 12 reaches the reference rod 13, so that an objective judgment standard is formed, an operator can determine the opening and closing amount of the control pipe section 1 according to the positions of the mark post 12 and the reference rod 13, and a series of scale marks can be arranged on the strip hole along the length direction of the strip hole to represent the flow rate at the corresponding scale positions. On the basis of the structure, furthermore, rectangular sponge blocks 14 are respectively embedded on two opposite side walls of the strip holes, and the marker posts 12 are extruded out of the installation pipe 3 from between the two sponge blocks 14 to seal and protect the interior of the installation pipe 3 and prevent a large amount of dust from entering.

Another implementation detail: the installation tube 3, the sliding block 4, the marker post 12 and the reference rod 13 are all plastic parts, as shown in fig. 4-5, the marker post 12 and the reference rod 13 are both in inverted L-shaped structures, the horizontal sections at the top ends of the marker post 12 and the reference rod 13 are arranged opposite to each other and are respectively embedded with a magnetic block 16, the polarities of the opposite surfaces of the two magnetic blocks 16 are opposite, and the magnetic attraction between the two magnetic blocks needs to ensure that the two magnetic blocks 16 can be separated from each other under the action of the elastic restoring force of the pressure spring 15 when the inflatable ball is loosened. The structure has obvious outstanding effects, the convenience of control of the expansion pipe 2 is further improved, when the expansion pipe 2 is used, the expansion pipe 2 is pushed to move by pressing the inflatable ball, the closer the expansion pipe 2 slides to one side of the installation pipe 3, the larger the attraction force between the two magnetic blocks 16 is, the more obvious the movement trend of the expansion pipe 2 is due to the pushing of the magnetic attraction force is, the defect that the inflatable ball is more and more difficult to compress due to the smaller and smaller volume when being compressed to the later stage is overcome, and the inflatable ball can control the expansion moving process of the whole expansion pipe 2 to be relatively easy and convenient all the time. After the inflatable ball is released, the pressure spring 15 can overcome the magnetic attraction to reset the sliding plate 9, the sliding plate 9 moves along with the expansion of the expansion pipe 2 in a retracting manner to assist in pushing out the bottom end of the expansion pipe 2 at the bottom of the valve hole 102, and the pipe section 1 is controlled to be in a normally open state.

During manufacturing, the inflatable ball is ellipsoidal, and one end of the inflatable ball in the long axis direction is provided with a through hole communicated with the orifice of the valve hole 102, so that the inflatable ball can be squeezed by a hand to provide compressed air. Finally, the compression spring 15 in the above embodiment is a conical spring, the large end of which is coaxially fixed to the closed end of the mounting tube 3, and the small end of which is coaxially connected to the free end of the guide rod 5, so as to increase the stability of the axial action of the spring under the premise of improving the elastic return action thereof.

Finally, in order to facilitate pressing the inflatable ball, and to enable the inflatable ball to be always in a compressed state when necessary, a compression device is further designed in the present embodiment, as shown in fig. 8, the compression device includes two pressing plates 210 hinged together, one end of each pressing plate 210 is hinged and connected to a V-shaped spring 220 in an inner included angle near the hinged position, and the spring 220 enables a certain clamping area to be formed between the two pressing plates 210. The other end of one of the pressing plates 210 is hinged with a connecting plate 230 in a damping manner, and the connecting plate 230 always tends to rotate towards the inner side of the clamping area due to the hinge of the damping manner, for example, an inclined top spring 240 can be arranged in an included angle formed between the upper pressing plate 210 and the connecting plate 230, and the top spring 240 always has a pushing force on the connecting plate 230, so that the connecting plate 230 is always close to and attached to the other end of the two pressing plates 210. Meanwhile, a plurality of arc-shaped blind cavities 2301 are formed in the surface of one side of the connecting plate 230 facing the clamping area along the length direction of the connecting plate, the arc-shaped bent free ends of the pressing plates 210 at the lower part of the blind cavities 2301 slide downwards, and the free ends of the pressing plates 210 at the lower part can smoothly slide upwards to change the size of the clamping area formed between the two pressing plates 210, so that the clamping area can adapt to the compression states of different inflatable balls and lock the inflatable balls in the required compression state, and although the structure is simple, the change and locking effect of the clamping area is very prominent.

Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.

Claims

1. A catheter for urology department, including the rubber tube that is used for carrying urine, its characterized in that:

the rubber tube is provided with a hard control tube section, and a urethral catheterization hole communicated with the rubber tube is formed in the control tube section; the urethral catheterization hole is vertically intersected with a valve hole of a blind hole structure which is radially arranged along the control pipe section, the hole bottom part of the valve hole is of an expanded spherical cavity structure, a flared hole sleeve which extends towards the depth direction in the valve hole is also arranged at the orifice of the valve hole, the large port of the flared hole sleeve is used as the orifice of the valve hole, the small port of the flared hole sleeve is coaxially and integrally connected with the open end of a circular test-tube-shaped expansion pipe, the expansion pipe comprises a spherical shell-shaped pipe bottom section and a circular tube-shaped body section, the elasticity of the body section is weaker than that of the pipe bottom section, so that when air is filled into the expansion pipe, the pipe bottom section is of an expanded spherical shape and is filled in the spherical cavity structure at the bottom of the valve hole, and the body section cuts off and seals the urethral catheterization hole;

the outer wall of the control pipe section around the orifice of the valve hole is connected with an inflatable ball which can press air into the expansion pipe through the orifice of the valve hole;

a sealing plug for sealing the outlet end of the rubber tube is inserted into the outlet end of the rubber tube; the inflatable ball can rotate in a vertical plane, and the orifice of the valve hole is communicated with the air outlet hole of the inflatable ball which rotates to the upper limit position; a vent hole is also arranged in the pipe wall of the control pipe section between the inflatable ball and the outlet end of the rubber pipe, one end of the vent hole can be communicated with the air outlet hole which rotates to the lower limit position, and the port at the other end is tightly attached to the matching surface of the sealing block and the end surface of the outlet end of the rubber pipe;

2. The urinary catheter according to claim 1, wherein: the diameter of the urethral catheterization hole is not more than two thirds of the diameter of the spherical cavity structure at the bottom of the valve hole.

3. The urinary catheter according to claim 1, wherein: and in a natural state, the outer wall of the expansion pipe is attached to the inner wall of the valve hole.

4. The urinary catheter according to claim 1, wherein: the inner surface and the outer surface of the joint between the tube bottom section and the body section are respectively provided with an annular groove.

5. The urological catheter according to claim 4, wherein: the cross section of the annular groove is semicircular.

6. The urinary catheter according to claim 5, wherein: the radius of the annular groove on the outer wall is smaller than the radius of the annular groove on the inner wall.

7. A urinary catheter according to any one of claims 4 to 6, wherein: the circle center of the semicircle of the cross section of the annular groove is positioned on the connecting surface between the tube bottom section and the body section.