CN112007260B

CN112007260B - Medical oncology bladder ware of dosing

Info

Publication number: CN112007260B
Application number: CN202010944136.3A
Authority: CN
Inventors: 杨志巧
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-09-10
Filing date: 2020-09-10
Publication date: 2022-07-15
Anticipated expiration: 2040-09-10
Also published as: CN112007260A

Abstract

The utility model discloses a bladder medicine feeder for medical oncology, which belongs to the technical field of medical instruments and comprises a catheter and a liquid discharge port; forming a liquid discharge tube head at the rear end of the catheter; an administration port is formed at the front end of the catheter; forming a dosing tube head at the rear end of the catheter; an elastic film is formed at the front end of the catheter; the tail end of the elastic film is formed with an elastic connecting ring; a plurality of elastic supporting rods are fixedly connected to the outer side of the elastic film; the catheter is provided with an opening part which can enable the front end of the elastic supporting rod to move outwards; the elastic membrane is unfolded to be capable of abutting against the inner wall of the bladder so as to isolate the bladder from urine. The utility model can make the medicine or cleaning fluid directly act on the inner wall of the bladder; the catheter is provided with the anti-falling air bag, so that the catheter can be prevented from accidentally sliding out of the body in the intubation process; can isolate part of bladder from urine, can not dilute the liquid medicine when directly using medicine or cleaning the bladder, is favorable for the full play of the medicine effect, accelerates the treatment speed of patients and reduces the pain of the patients.

Description

Bladder medicine feeder for medical oncology

Technical Field

The utility model belongs to the technical field of medical instruments, and particularly relates to a bladder drug delivery device for medical oncology.

Background

The Chinese patent document with the document number of CN209033506U discloses the utility model discloses a bladder drug adding device, which comprises a tube body, a balloon, a urination port, a drug adding port and an inflation port; the saccule is connected with the side wall of the tube body; the tube body is provided with a urination channel, an inflation channel, a medicine feeding channel, a urine guide port and a medicine outlet; the urination channel is respectively communicated with the urethral catheterization port and the urination port, the inflation channel is respectively communicated with the saccule and the inflation port, and the medicine feeding channel is respectively communicated with the medicine feeding port and the medicine outlet; wherein, the medicine outlet and the urethral catheterization opening are respectively positioned at the upper side and the lower side of the sacculus. The utility model can effectively administer drug to the mouth of the bladder of a patient, and has the advantages of easy manufacture and low manufacturing cost.

However, when the bladder is directly used, most of the medicines are diluted by urine and are discharged out of the body along with a catheter, so that the medicine effect is slow, in addition, for part of patients, mucous membranes on the inner wall of the bladder are often accompanied with inflammation or ulcerated dead skin, the bladder absorbs the medicines slowly, and the medicines can be directly used after being cleaned, and the patents cannot meet the actual use requirements.

Disclosure of Invention

The technical problem to be solved by the utility model is as follows: aiming at the defects in the prior art, the bladder administration device for the medical oncology is provided.

In order to realize the purpose of the utility model, the following technical scheme is adopted to realize the purpose: a bladder administration device for medical oncology comprises a catheter and a liquid outlet formed on the outer wall of the catheter close to the front end; a liquid discharge pipe head communicated with the liquid discharge port is formed at the rear end of the catheter; an administration port is formed at the front end of the catheter; and a drug delivery pipe head communicated with the drug delivery port is formed at the rear end of the catheter.

The front end of the catheter is positioned outside the drug delivery port to form an elastic film; an elastic connecting ring I is formed at the tail end of the elastic film; a plurality of elastic support rods are uniformly and fixedly connected to the outer side of the elastic film along the axis of the catheter; two ends of the elastic supporting rod are fixedly connected with the first elastic connecting ring and the joint of the catheter and the elastic film respectively.

The catheter is provided with an opening part which can enable the front end of the elastic supporting rod to move outwards.

Under the natural state, the elastic supporting rods are parallel and tightly attached to each other, and the catheter can be inserted into the bladder.

When the front end of the elastic supporting rod moves outwards, the elastic film is unfolded to be capable of propping against the inner wall of the bladder to isolate the bladder at the position, and when the bladder at the position is used, the medicine cannot be diluted by the urine.

As a preferable scheme: the opening part comprises a second connecting ring which is sleeved on the outer wall of the catheter in a sliding manner along the axis of the catheter and is close to the front end of the catheter; the front ends of the connecting rings are uniformly and fixedly connected with second linkage parts with the same number as the elastic supporting rods; the front end of each second linkage part is fixedly connected with the front end of the elastic supporting rod respectively.

The rear ends of the connecting rings are fixedly connected with first linkage parts which are symmetrically arranged; the rear end of the first linkage part is fixedly connected with a push-pull pipe; the push-pull tube is close to the administration tube orifice and is sleeved on the outer wall of the catheter in a sliding manner along the axis of the catheter.

When the elastic supporting rods are parallel and tightly attached to each other, the push-pull pipe is positioned at the limit position of the front end; when the push-pull pipe slides backwards, the push-pull pipe is driven by the first linkage part, the second connecting ring and the second linkage part in sequence, so that the front end of the elastic supporting rod moves outwards.

As a preferable scheme: a falling-off prevention air bag is formed at the front part of the outer wall of the catheter at the rear end of the liquid outlet; the rear end of the catheter is formed with an air duct head communicated with the interior of the anti-falling air bag.

When the air is not in the anti-slip air bag, the anti-slip air bag can be inserted into the bladder along with the catheter.

When gas is injected into the anti-slip air bag through the air guide pipe head, the anti-slip air bag is expanded, and the diameter of the expanded anti-slip air bag is larger than that of the inner opening of the urethra.

Compared with the prior art, the utility model has the beneficial effects that: in the initial state, the elastic support rods are parallel to each other and tightly attached to each other; the elastic film is in a natural shrinkage state, and is smooth and free of wrinkles; no gas exists in the anti-falling air bag; the push-pull pipe is at the front end limit position.

When the product is used, the proper product specification is selected according to the actual physiological condition of a patient and the size of the bladder, and the relative positions of the anti-falling air bag and the elastic film of the product are different and are divided into various specifications. The sterile gloves are worn on both hands, the product is disinfected and is prepared correspondingly, and the urine bag plug is inserted into the liquid discharge tube head. The hemostatic forceps are held by hands to clamp the catheter so that the front end of the catheter is inserted into the urethral orifice, the catheter is slowly pushed inwards, and the pushing is stopped after obvious resistance exists. Urine in the bladder and the urethra flows into the liquid discharge port, and then flows into the urine bag through the liquid discharge pipe, the liquid discharge pipe head and the urine bag plug in sequence.

After urine in the bladder basically flows out, the position of the catheter is kept relatively fixed, and the push-pull tube is pulled backwards to the limit position, so that the push-pull tube sequentially drives the first linkage part, the connecting ring II and the second linkage part to move towards the rear end. The second linkage part pulls the elastic connecting ring to move towards the rear end, and simultaneously the front end of the elastic supporting rod moves towards the outer side. The elastic film and the elastic connecting ring I are elastically deformed outwards to a funnel shape under the pulling of the elastic supporting rod. The push-pull tube and the catheter are kept relatively fixed, and the catheter is pushed inwards to enable the elastic film to be propped against the inner wall of the bladder. The ureter orifice is close to the inner orifice of the urethra, so the flexible film can not shield the ureter orifice after being unfolded, and urine flowing out of the ureter orifice can not enter the funnel-shaped flexible film. At the moment, urine flowing out of the urine conveying pipe opening flows into the liquid discharge opening, sequentially flows through the liquid discharge pipe, the liquid discharge pipe head and the urine bag plug and then flows into the urine bag. The space formed between the elastic film and the bladder wall isolates urine, when the bladder in the space is cleaned or used, the liquid medicine and the cleaning liquid can not contact with the urine, namely, can not be polluted and diluted, and therefore the cleaning effect and the medicine effect are optimal. The diameter of the elastic connecting ring I is smaller than that of the connecting ring II, so that the front end of the elastic supporting rod has outward component force, meanwhile, the elastic supporting rod has certain elasticity, and when the elastic supporting rod is pulled, the front end of the elastic supporting rod moves outward and cannot enable the catheter to retreat from the urethra backwards.

At the moment, the anti-release air bag also enters the bladder and is close to the inner opening of the urethra, the inflating needle head penetrates through the elastic rubber plug on the air guide pipe head, so that air sequentially enters the anti-release air bag through the air guide pipe head and the air guide pipe, and the anti-release air bag is expanded to be capable of being clamped on the inner opening of the urethra. When the push-pull tube and the catheter are loosened, the elastic force of the elastic connecting ring I enables the elastic connecting ring I to move towards the front end relative to the catheter, the anti-release air bag moves backwards to be tightly propped against the inner opening of the urethra, and the elastic film is reduced and still propped against the bladder wall. The diameter of the anti-slip air bag is larger than that of the inner opening of the urethra, so that the catheter can be prevented from slipping out, and the patient can be prevented from carrying out secondary intubation.

Penetrate the elasticity plug in the tube head of dosing with the syringe needle, make the syringe needle enter into the tube head of dosing, the interior liquid medicine of syringe can push the pipe of dosing, and then enters into the bladder that separates with the urine through the mouth of pipe of dosing on, makes the medicine more easily get into and use the affected part. The injection can also be cleaning fluid, can clean the bladder inner wall separated by urine, and excessive cleaning fluid can be sucked out through the administration tube head or overflow from the elastic film excessively and flow out of the body through the liquid discharge tube.

When the product is taken out, the elastic rubber plug on the air duct head is taken down, so that the gas in the anti-falling air bag is completely discharged. The push-pull pipe is pushed to the front end to the extreme position of the front end, the elastic film and the elastic connecting ring I recover to the initial state under the elastic action, and the elastic support rod recovers to be parallel to each other and clings to each other under the elastic action of the elastic connecting ring I and the elastic support rod. The catheter is wrapped by gauze and pulled out and put into a treatment bowl.

According to the utility model, through the design of the catheter, the catheter is inserted into the bladder, so that urine can be led out; meanwhile, the medicine or the clean water can directly reach the affected part which is wrapped by the elastic film above the ureter mouth through the administration tube, thereby being beneficial to the treatment and the cleaning of the affected part.

According to the utility model, through the design of the elastic film, the elastic film is smoothly attached to the elastic supporting rods which are parallel and closely attached to each other in a natural state, and can be inserted into the bladder along with the catheter; through pulling backward the push-and-pull pipe, drive first linkage portion, go-between two, second linkage portion in proper order in succession, second linkage portion will make the outside motion of elastic support pole front end to the outside to pulling elastic connecting ring one to the outside, make the elastic film open then, the elastic film can offset the isolated urine of bladder that makes here with the bladder wall after opening, when using medicine or wasing, can not mix with the urine, guaranteed the full play of drug effect, reach best treatment.

The utility model can insert into the bladder along with the catheter by designing the anti-release air bag in a natural state, and can expand to be clamped with the inner opening of the urethra after air is injected into the anti-release air bag through the air duct to prevent the catheter from sliding out of the body.

The utility model can make the medicine or cleaning fluid directly act on the inner wall of the bladder, which is beneficial to the medicine absorption of the affected part and improves the treatment effect; the catheter is provided with the anti-falling air bag, so that the catheter can be prevented from accidentally sliding out of the body in the process of intubation, and the secondary pain of a patient is reduced; the utility model can isolate part of bladder from urine, when the medicine is directly used or cleaned in bladder, the medicine liquid can not be diluted, and the bladder cleaning effect is better, thereby being beneficial to the full play of medicine effect, accelerating the treatment speed of patients and reducing the pain of patients.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Fig. 2 is a schematic cross-sectional structure of the present invention.

Fig. 3 is a schematic exploded view of the present invention.

FIG. 4 is a schematic cross-sectional view of the airway tube, administration tube and drain tube of the present invention.

Fig. 5 is a schematic sectional view of the expanding portion of the present invention.

10. A catheter; 101. a drop-preventing air bag; 102. an elastic film; 1021. a first elastic connecting ring; 1022. an elastic support bar; 103. a gas-guide tube; 1031. an air guide pipe head; 104. an administration tube; 1041. a dosing tube head; 1042. an administration port; 105. a liquid discharge pipe; 1051. a liquid discharge tube head; 1052. a liquid discharge port; 11. a distraction section; 111. pushing and pulling the pipe; 112. a first linkage section; 113. a second connecting ring; 114. a second linkage portion; 2. an elastic rubber plug; 3. a urine bag plug; A. a bladder; B. ureter orifice.

Detailed Description

Example 1

Referring to fig. 1 to 5, the bladder administration device for medical oncology comprises a catheter 10 and a liquid discharge port 1052 formed on an outer wall of the catheter 10 near a front end; a liquid discharge pipe head 1051 communicated with the liquid discharge port 1051 is formed at the rear end of the catheter 10; an administration port 1042 is formed at the front end of the catheter 10; a drug delivery tube head 1041 communicated with the drug delivery port 1042 is formed at the rear end of the catheter 10.

A liquid discharge pipe 105 which is respectively communicated with the liquid discharge port 1052 and the liquid supply and discharge pipe head 1051 is formed in the urinary catheter 10; an administration tube 104 is formed in the urinary catheter 10 and is connected to the administration port 1042 and the administration tube head 1041.

The liquid discharge tube head 1051 is detachably and hermetically inserted with a urine bag plug 3; the urine bag plug 3 is connected to a urine bag, and urine flowing into the liquid discharge port 1052 flows through the liquid discharge pipe 105, the liquid discharge tube head 1051, the urine bag plug 3 in sequence, and then flows into the urine bag for sampling, testing and discharging.

The front end of the catheter 10 is positioned outside the administration port 1042 and is formed with an elastic film 102; the end of the elastic film 102 is formed with an elastic connecting ring I1021 perpendicular to the central axis of the urinary catheter 10; a plurality of elastic supporting rods 1022 are uniformly and fixedly connected to the outer side of the elastic film 102 along the axis of the urinary catheter 10; two ends of the elastic support bar 1022 are respectively and fixedly connected with the elastic connecting ring one 1021 and the joint of the catheter 10 and the elastic film 102.

The urinary catheter 10 is provided with a spreader 11 for moving the distal end of the elastic support bar 1022 outward.

In the natural state, the flexible support rods 1022 are parallel and close to each other, and the catheter 10 can be inserted into the bladder.

When the front end of the elastic supporting rod 1022 moves outwards, the elastic film 102 is unfolded to abut against the inner wall of the bladder so as to isolate the bladder from urine, and when the bladder is used, the medicine cannot be diluted by the urine.

At this time, urine flowing out of the ureter opening flows into the liquid discharge opening 1052, and flows through the liquid discharge pipe 105, the liquid discharge pipe head 1051 and the urine bag plug 3 in sequence to flow into the urine bag, and the space formed between the elastic membrane 102 and the bladder wall isolates the urine, so that when the bladder in the space is cleaned or dosed, the liquid medicine and the cleaning liquid do not contact with the urine, i.e. cannot be polluted and diluted, and the cleaning effect and the drug effect are optimal.

The opening part 11 comprises a second connecting ring 113 which is sleeved on the outer wall of the urinary catheter 10 in a sliding manner along the axis of the urinary catheter 10 and is close to the front end of the urinary catheter 10; the front end of the second connecting ring 113 is uniformly and fixedly connected with second linkage parts 114 with the same number as the elastic supporting rods 1022; the front end of each of the second linkage portions 114 is fixedly connected to the front end of the elastic supporting bar 1022.

The rear end of the connecting ring II 113 is fixedly connected with first linkage parts 112 which are symmetrically arranged; the rear end of the first linkage part 112 is fixedly connected with a push-pull pipe 111; the push-pull tube 111 is close to the administration tube mouth 1042 and is slidably sleeved on the outer wall of the urinary catheter 10 along the axis of the urinary catheter 10.

When the elastic supporting rods 1022 are parallel to each other and tightly attached to each other, the push-pull pipe 111 is located at the front end limit position; when the push-pull tube 111 slides backwards, the front end of the elastic support bar 1022 moves outwards under the driving of the first linkage portion 112, the second connection ring 113 and the second linkage portion 114 in sequence.

The elastic support rods 1022 may be made of a rigid material with good flexibility, such as medical nitinol, which can be freely bent according to the physiological characteristics of a patient during intubation and has a certain elasticity, and in a natural state, the elastic support rods are parallel to each other and tightly attached to each other, and the front ends of the elastic support rods can elastically deform outward after being pulled, so that the elastic membrane 102 is unfolded.

A slip-stopping air bag 101 is formed at the rear end of the liquid outlet 1052 in the front part of the outer wall of the catheter 10; an air duct head 1031 communicated with the interior of the anti-falling balloon 101 is formed at the rear end of the urinary catheter 10.

An air duct 103 communicated with the interior of the anti-slip balloon 101 and the air duct head 1031 is formed on the inner wall of the urinary catheter 10.

When there is no gas in the anti-slip balloon 101, the anti-slip balloon 101 can be inserted into the bladder together with the urinary catheter 10.

When gas is injected into the anti-slip balloon 101 through the gas leading head 1031, the anti-slip balloon 101 is expanded and the expanded diameter is larger than the diameter of the urethra inner orifice.

The anti-slip air bag 101 enables the catheter 10 to be clamped in the inner opening of the urethra, so that the catheter 10 is prevented from slipping out, and the patient is prevented from suffering from secondary intubation.

The liquid discharge pipe 105, the air guide pipe 103 and the administration pipe 104 are all made by integral molding, so that the outer wall of the catheter 10 is smooth, and the catheter 10 can be inserted into the bladder conveniently.

The air duct head 1031 and the administration tube head 1041 are internally provided with an elastic rubber plug 2 which can be detached, sealed and inserted; through directly taking off elasticity plug 2 or through directly penetrating through the syringe needle elasticity plug 2, to aerify in the air duct head 1031, to inject medicine or washing liquid in the tube head 1041 of dosing, convenient to use person operates, improves work efficiency.

The catheter 10 can be made of corrosion-resistant medical silica gel materials and is resistant to two-way corrosion of urine and flushing agents, the catheter 10 is formed step by step, the silica gel materials are placed in a die cavity for prepressing, then flexible materials with latticed micropores on the surfaces are embedded in the preset positions of the opening portions 11 and are placed in the die cavity together, then the die is closed, heating and pressurizing are carried out for a certain time, and the flexible materials and redundant parts are removed, so that the catheter can be integrally formed.

The first linkage portion 112 and the second linkage portion 114 can be made of a flexible material with good rigidity, such as a medical stainless steel rope or a medical nylon wire rope, and on the premise of ensuring the tensile strength, the flexible material can enable the catheter 10 to be inserted into the urethra more easily, so that the pain of a patient is less.

In the initial state, the elastic support bars 1022 are parallel and closely attached to each other; the elastic film 102 is in a natural shrinkage state, smooth and wrinkle-free; no gas is in the anti-falling air bag 101; the push-pull tube 111 is in a forward end limit position.

When the product is used, the proper product specification is selected according to the actual physiological condition of a patient and the size of the bladder, and the relative positions of the anti-falling air bag 101 and the elastic film 102 of the product are different and are divided into a plurality of specifications. The sterile gloves are worn on both hands, the product is sterilized and prepared correspondingly, and the urine bag plug 3 is inserted into the liquid discharge tube head 1051. The catheter 10 is held by the hemostatic forceps held by the hand so that the front end of the catheter 10 is inserted into the urethral orifice, the catheter 10 is slowly pushed inwards, and the pushing stops after obvious resistance exists. Urine in the bladder and urethra flows into the drainage port 1052, and then flows through the drainage tube 105, the drainage tube head 1051 and the urine bag plug 3 in sequence to flow into the urine bag.

After the urine in the bladder is substantially drained, the position of the urinary catheter 10 is kept relatively fixed, and the push-pull tube 111 is pulled backwards to the limit position, so that the push-pull tube 111 sequentially drives the first linkage part 112, the connecting ring II 113 and the second linkage part 114 to move towards the rear end. The second linkage 114 pulls the elastic connection ring one 1021 to move towards the rear end, and simultaneously the front end of the elastic support bar 1022 moves towards the outside. The elastic film 102 and the elastic connection ring one 1021 are pulled by the elastic support bar 1022 to elastically deform outward into a funnel shape. Keeping the push-pull tube 111 in a fixed position relative to the catheter 10, the catheter 10 is pushed inwards so that the elastic membrane 102 abuts the inner wall of the bladder. The ureteral orifice is close to the inner orifice of the urethra, so the flexible film 102 will not cover the ureteral orifice after being unfolded, and the urine flowing out from the ureteral orifice will not enter the funnel-shaped flexible film 102. At this time, the urine flowing out from the ureter opening flows into the drain opening 1052, and flows through the drain tube 105, the drain nipple 1051, and the urine bag plug 3 in order to flow into the urine bag. The space formed between the elastic membrane 102 and the bladder wall isolates urine, so that when the bladder in the space is cleaned or used, the liquid medicine and the cleaning liquid can not contact with the urine, namely can not be polluted and diluted, and the cleaning effect and the medicine effect can be optimal. The diameter of the elastic connection ring one 1021 is smaller than that of the connection ring two 113, so that the front end of the elastic support bar 1022 has an outward component, and meanwhile, the elastic support bar 1022 has a certain elasticity, and when the elastic support bar 1022 is pulled, the front end of the elastic support bar 1022 moves outward and cannot cause the urinary catheter 10 to retreat from the urethra.

At this time, the anti-dehydration air bag 101 also enters the bladder close to the inner opening of the urethra, and the inflating needle passes through the elastic rubber plug 2 on the air guide tube head 1031, so that the air sequentially passes through the air guide tube head 1031 and the air guide tube 103 and enters the anti-dehydration air bag 101, and the anti-dehydration air bag 101 is expanded to be capable of being clamped on the inner opening of the urethra. When the push-pull tube 111 and the catheter 10 are loosened, the elastic force of the elastic connecting ring I1021 enables the elastic connecting ring I1021 to move towards the front end relative to the catheter 10, the anti-slip air bag 101 moves backwards to be tightly abutted against the inner opening of the urethra, and the elastic film 102 shrinks and still abuts against the bladder wall. The diameter of the anti-slip air bag 101 is larger than the diameter of the inner opening of the urethra, so that the catheter 10 can be prevented from slipping out, and the patient can be prevented from carrying out secondary intubation

Penetrate the elasticity plug 2 in the tube head 1041 of dosing with the syringe needle, make the needle enter into the tube head 1041 of dosing, the interior liquid medicine of syringe can push into the pipe 104 of dosing, and then enters into the bladder that separates with the urine through the mouth of pipe 1042 of dosing, makes the medicine more enter and use the affected part easily. The injectate can also be a cleaning solution, which can clean the inner wall of the urinary bladder separated by urine, and excessive cleaning solution can be sucked out through the administration tube head 1041, or overflow from the elastic membrane 102 and flow out of the body through the drainage tube 105.

When the product is taken out, the elastic rubber plug 2 on the air guide pipe head 1031 is taken down, so that the gas in the anti-release air bag 101 is completely discharged. The push-pull tube 111 is pushed to the front end to the limit position, the elastic film 102 and the elastic connection ring one 1021 return to the original state under the elastic action, and the elastic support bar 1022 returns to be parallel to and close to each other under the elastic action of the elastic connection ring one 1021 and the self-elastic action. The catheter 10 is wrapped by gauze and pulled out and put into a treatment bowl.

According to the utility model, through the design of the catheter 10, the catheter 10 is inserted into the bladder, so that urine can be led out; meanwhile, the medicine or the clean water can directly reach the affected part wrapped by the elastic film above the ureter mouth through the administration tube 104, which is beneficial to the treatment and cleaning of the affected part.

According to the utility model, through the design of the elastic film 102, when the elastic film 102 is in a natural state, the elastic film is smoothly attached to the elastic supporting rods 1022 which are parallel and attached tightly, and can be inserted into the bladder along with the urinary catheter 10; through pulling push-and-pull tube 111 backward, drive first linkage portion 112, go-between two 113, second linkage portion 114 in proper order in succession, second linkage portion 114 will be outside to pull elasticity go-between 1021 and make the outside motion of elastic support 1022 front end, make elastic film 102 open then, elastic film 102 opens the back and can offset the isolated urine of bladder that makes here with the bladder wall, when using medicine or wasing, can not mix with the urine, the full play of drug effect has been guaranteed, reach best treatment.

According to the utility model, through the design of the anti-release air bag 101, the anti-release air bag 101 can be inserted into the bladder along with the catheter 10 in a natural state, and can be expanded to be clamped with the inner opening of the urethra after air is injected into the anti-release air bag 101 through the air duct 103, so that the catheter 10 is prevented from sliding out of the body.

Claims

1. An oncology bladder ware of dosing which characterized in that: comprises a catheter and a liquid outlet formed on the outer wall of the catheter close to the front end; a liquid discharge pipe head communicated with the liquid discharge port is formed at the rear end of the catheter; an administration port is formed at the front end of the catheter; a drug delivery pipe head communicated with the drug delivery port is formed at the rear end of the catheter;

an elastic film is formed at the front end of the catheter outside the drug delivery port; an elastic connecting ring I is formed at the tail end of the elastic film; a plurality of elastic support rods are uniformly and fixedly connected to the outer side of the elastic film along the axis of the catheter; two ends of the elastic supporting rod are respectively and fixedly connected with the first elastic connecting ring and the joint of the catheter and the elastic film;

the catheter is provided with an opening part which can enable the front end of the elastic supporting rod to move outwards;

in a natural state, the elastic support rods are parallel and tightly attached to each other, and the catheter can be inserted into the bladder;

when the front end of the elastic supporting rod moves outwards, the elastic film is unfolded to be capable of abutting against the inner wall of the bladder so that the bladder at the position can be isolated from urine, and when the bladder at the position is used, the medicine cannot be diluted by the urine;

the opening part comprises a second connecting ring which is sleeved on the outer wall of the catheter in a sliding manner along the axis of the catheter and is close to the front end of the catheter; the front ends of the connecting rings are uniformly and fixedly connected with second linkage parts with the same number as the elastic supporting rods; the front end of each second linkage part is fixedly connected with the front end of the elastic supporting rod;

the rear ends of the connecting rings are fixedly connected with first linkage parts which are symmetrically arranged; the rear end of the first linkage part is fixedly connected with a push-pull pipe; the push-pull tube is close to the administration tube orifice and is sleeved on the outer wall of the catheter in a sliding manner along the axis of the catheter;

when the elastic supporting rods are mutually parallel and tightly attached, the push-pull pipe is positioned at the limit position of the front end; when the push-pull pipe slides backwards, the push-pull pipe is driven by the first linkage part, the connecting ring II and the second linkage part in sequence, so that the front end of the elastic supporting rod moves outwards;

a separation-preventing air bag is formed at the front part of the outer wall of the catheter and positioned at the rear end of the liquid outlet; the rear end of the catheter is formed with an air duct head communicated with the interior of the anti-falling air bag;

when no gas is in the anti-release air bag, the anti-release air bag can be inserted into the bladder along with the catheter;