Special catheter for increasing drug treatment contact area in bladder cavity

Abstract

The invention discloses a special catheter for increasing the drug treatment contact area in a bladder cavity, and the catheter comprises an inner core, the front end of the inner core is provided with a film water bag, the rear end of the inner core is provided with a water injection hole, and the water injection hole is connected with the film water bag through a hollow tubular structure; a medicine channel is formed in the outer sheath in the length direction, and a medicine outlet hole and a medicine inlet hole are formed in the positions, corresponding to the front end and the rear end of the outer sheath, of the medicine channel respectively; the inner core slides relative to the outer sheath, the thin film water bag is deformable and moves along the containing channel in a folded state, the water injection hole is used for injecting water into the thin film water bag when the thin film water bag is pushed out of the containing channel, and a medicine gathering cavity gap is formed between the thin film water bag and the bladder wall after the thin film water bag expands. The thin film water bag can be expanded to greatly reduce the volume in the bladder, so that the medicine usage amount is greatly reduced through the medicine gathering cavity gap, full contact between a small amount of medicine liquid and the bladder wall can be guaranteed, the utilization rate of the medicine liquid is guaranteed, and the burden of a patient is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and more particularly to a special urinary catheter for increasing the contact area of drug treatment in the bladder cavity. Background Art

[0002] Intravesical drug therapy, also known as intravesical instillation, involves instilling medication into the bladder via a urinary catheter. The interaction between the medication and the bladder mucosa achieves therapeutic effects. The most common intravesical drug therapy is intravesical instillation, used to prevent bladder cancer recurrence. Bladder cancer is one of the most common malignant tumors of the urinary system and has a high recurrence rate, reaching as high as 70% within five years. Intravesical instillation is the most important postoperative measure for preventing recurrence in bladder cancer treatment. Therefore, intravesical instillation is a very common treatment in clinical practice and holds a significant medical importance.

[0003] The efficacy of intravesical instillation therapy is, to a certain extent, related to the concentration of the instilled drug and the size of the bladder mucosa-drug interface. Theoretically, to improve the instillation effect while maintaining the same drug concentration, the size of the bladder mucosa-drug interface must be increased. This means that the bladder must be kept relatively full. Therefore, the volume of the bladder cavity during treatment must be increased, meaning the total amount of drug instilled must be increased. However, this approach can significantly increase treatment costs, placing a significant financial burden on patients and therefore needs improvement. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a special catheter that increases the contact area of drug treatment in the bladder cavity, so as to achieve sufficient contact with the bladder with a smaller amount of drug solution, thereby reducing the need for drug solution use, increasing the drug solution utilization rate, and reducing the economic burden on patients.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A special urinary catheter for increasing the contact area of drug treatment in the bladder cavity, comprising:

[0007] The inner core is a hollow tubular structure with a thin film water bag at its front end and a water injection hole at its rear end, wherein the water injection hole is connected to the thin film water bag through the hollow tubular structure;

[0008] An outer sheath, wherein a through accommodating channel is formed along the axis in the outer sheath to accommodate the inner core, and a drug channel is formed along the length direction of the outer sheath, and a drug outlet hole and a drug inlet hole are formed in the drug channel corresponding to the front end and the rear end of the outer sheath respectively;

[0009] The inner core is arranged to slide relative to the outer sheath, the film water bag can be deformed and move along the accommodating channel in the collapsed state, the water injection hole is used to inject water into the film water bag when the film water bag is pushed out of the accommodating channel, and after the film water bag expands, a drug accumulation cavity is formed between the film water bag and the bladder wall.

[0010] As a further improvement of the present invention, the shape of the film water bag is adapted to the shape of the bladder, and a constraint component is provided between the inner core and the outer sheath, and the constraint component is used to constrain the inner core to move linearly relative to the outer sheath.

[0011] As a further improvement of the present invention, the constraint assembly includes a constraint block arranged along the length direction of the inner core surface, the accommodating channel is provided with a constraint groove corresponding to the constraint block and is slidably connected to the constraint block, and a gap is formed between the outer wall of the inner core and the accommodating channel through the constraint block.

[0012] As a further improvement of the present invention, the film water bag includes an extension section, which is used to be sleeved on the front end of the inner core and glued to the inner core.

[0013] As a further improvement of the present invention, the outer sheath surface is covered with an elastic membrane, the drug channel includes a channel formed by the elastic membrane and the outer sheath surface after expansion, and a flow limiting structure is provided at the end of the drug channel, which is used to limit the flow of the drug in the drug channel out along the drug inlet.

[0014] As a further improvement of the present invention, a connecting seat is also included, the connecting seat is provided with a connecting tube and is connected to the elastic membrane, a plurality of elastic valves are provided circumferentially inside the connecting tube, one end of the plurality of elastic valves is fixed to the inner wall of the connecting tube, and the other ends contact each other to seal the connecting tube, and the elastic valve is used to deform when under pressure to open the connecting tube.

[0015] As a further improvement of the present invention, a marking ring is provided at the front end of the outer sheath, and the marking ring is used for development under X-ray.

[0016] Beneficial effects of the present invention:

[0017] 1. The thin film water bladder can be expanded to significantly reduce the volume of the bladder, thereby significantly reducing the amount of medicine used by concentrating the medicine in the cavity. When a small amount of medicine is used, it can ensure sufficient contact between the medicine and the bladder wall, thereby ensuring the utilization rate of the medicine and reducing the burden on patients.

[0018] 2. The inner core and outer sheath are arranged to enable the membrane water bag to be put in and out, thereby ensuring the overall volume is small while being convenient to use;

[0019] 3. By constraining the components and restricting the shape of the membrane water balloon, the position of the membrane water balloon can be ensured to correspond to the position of the bladder during insertion, thereby further reducing the cavity where the drug accumulates while avoiding the pressure on the bladder wall caused by the irregular surface of the membrane water balloon;

[0020] 4. The setting of the flow-limiting structure can be coordinated with the setting of the elastic membrane to greatly reduce the residual drug solution in the drug channel, thereby ensuring accurate drug dosage. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a cross-sectional diagram of the film water bag of the present invention in a folded state;

[0022] Figure 2 for Figure 1 A partial enlarged view;

[0023] Figure 3 This is a schematic diagram of the film water bag of the present invention in an expanded state;

[0024] Figure 4 This is a schematic diagram of the installation of the elastic valve of the present invention.

[0025] Figure markings: 1. inner core; 2. thin film water bag; 3. water injection hole; 4. outer sheath; 5. accommodating channel; 6. drug channel; 7. drug outlet hole; 8. drug inlet hole; 9. drug gathering cavity; 10. constraint block; 11. constraint groove; 12. gap; 13. extension section; 14. elastic membrane; 15. connecting seat; 16. connecting tube; 17. elastic valve; 18. marking ring. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments, wherein the same components are represented by the same reference numerals.

[0027] like Figure 1-4 As shown, a special urinary catheter for increasing the contact area of drug treatment in the bladder cavity comprises:

[0028] The inner core 1 and the outer sheath 4, the inner core 1 is a hollow tubular structure made of medical silica gel, a thin film water bag 2 is provided at its front end, and a water injection hole 3 is provided at the rear end of the inner core 1, and the water injection hole 3 is connected to the thin film water bag 2 through the hollow tubular structure.

[0029] The outer sheath 4 is made of silicone, and a through accommodating channel 5 is formed along the axis inside the outer sheath 4 to accommodate the inner core 1. The outer sheath 4 forms a drug channel 6 along the length direction, and the drug channel 6 forms a drug outlet 7 and a drug inlet 8 at the front and rear ends of the outer sheath 4 respectively.

[0030] Furthermore, the inner core 1 is slidingly arranged relative to the outer sheath 4, and the film water bag 2 can be deformed and move along the accommodating channel 5 when in a retracted state. Specifically, the film water bag 2 is made of highly compliant polyurethane material, and the water injection hole 3 is used to inject water into the film water bag 2 when the film water bag 2 is pushed out of the accommodating channel 5. After the film water bag 2 expands, a drug accumulation cavity 9 is formed between the film water bag 2 and the bladder wall.

[0031] During use, the operator pre-inserts the outer sheath 4 into the bladder along the urethra. At this time, the film water bag 2 is in a folded and collapsed state. Then, by pushing the inner core 1, the film water bag 2 is driven to move along the accommodating channel 5 and extend out at the front end of the outer sheath 4. Water is further injected into the film water bag 2 through the water injection hole 3, so that the film water bag 2 expands. A drug gathering cavity 9 is formed between the expanded film water bag 2 and the bladder wall. The drug is further delivered into the bladder through the drug delivery channel, so that the drug solution gathers in the drug gathering cavity 9 to ensure that the drug solution is fully contacted and absorbed by the bladder wall, thereby greatly improving the utilization rate of the drug solution, thereby reducing the amount of drug solution used and reducing the economic burden on patients.

[0032] Preferably, the shape of the film water bag 2 is adapted to the shape of the bladder, thereby further reducing the drug accumulation cavity 9 and further reducing the use of liquid medicine. At the same time, due to the non-circular structure of the bladder itself, the adapted film water bag 2 can avoid excessive squeezing of the bladder wall after expansion. A constraint component is provided between the inner core 1 and the outer sheath 4. The constraint component is used to constrain the inner core 1 to move in a straight line relative to the outer sheath 4. Through the setting of the constraint component, the special shape of the film water bag 2 can be adapted to ensure that the position of the film water bag 2 is determined after entry, thereby avoiding excessive squeezing of the bladder wall caused by deflection, etc.

[0033] Preferably, the constraint assembly includes a constraint block 10 arranged along the length direction of the surface of the inner core 1, the accommodating channel 5 is provided with a constraint groove 11 corresponding to the constraint block 10 and is slidingly connected to the constraint block 10, and a gap 12 is formed between the outer wall of the inner core 1 and the accommodating channel 5 through the constraint block 10.

[0034] The arrangement of the constraint block 10 and the constraint groove 11 can ensure the constraint effect, while the arrangement of the gap 12 can further reduce the movement resistance between the inner core 1 and the outer sheath 4, thereby making the movement of the inner core 1 smoother.

[0035] Preferably, the film water bag 2 includes an extension section 13 , and the extension section 13 is used to be sleeved on the front end of the inner core 1 and glued to the inner core 1 .

[0036] During use, the operator can take an X-ray of the patient's bladder in advance, and manufacture a thin film water bag 2 that is adapted to the shape of the individual's bladder according to the pattern, and then connect the thin film water bag 2 to the inner core 1 through the extension section 13 to achieve personalized treatment needs, thereby ensuring adaptation to different groups of people due to different bladder shapes and sizes.

[0037] Preferably, the surface of the outer sheath 4 is covered with an elastic membrane 14, and the drug channel 6 includes a channel formed by the elastic membrane 14 and the surface of the outer sheath 4 after expansion. A flow limiting structure is provided at the end of the drug channel 6, which is used to limit the flow of the drug in the drug channel 6 out along the drug inlet.

[0038] By setting the elastic membrane 14 and coordinating the flow limiting structure, after the drug delivery is completed, the drug in the elastic membrane 14 can be driven out of the drug control by the urethra's own force, thereby avoiding a large amount of drug residue in the drug channel 6.

[0039] Preferably, a connecting seat 15 is further included, on which a connecting tube 16 is provided and connected to the elastic membrane 14. Specifically, the medicine inlet 8 is located at the end of the connecting seat 15 away from the connecting tube 16, and a plurality of elastic valves 17 are provided circumferentially within the connecting tube 16. One end of the plurality of elastic valves 17 is fixed to the inner wall of the connecting tube 16, and the other end contacts each other to seal the connecting tube 16. The elastic valve 17 is used to deform when under pressure to open the connecting tube 16.

[0040] The connection seat 15 is convenient for connecting with a medicine injection device, which includes a syringe or any other medical injection device or instrument in the prior art.

[0041] In the initial state, multiple elastic valves 17 are elastically contracted to each other, thereby blocking the connecting tube 16. When in use, the injection device is connected to the connecting seat 15, so that medicine is supplied to the elastic valves 17, which causes the elastic valves 17 to be pressurized, thereby causing the elastic valves 17 to deform, and then opening the connecting tube 16 to complete the injection action.

[0042] Preferably, a marking ring 18 is provided at the front end of the outer sheath 4, and the marking ring 18 is used for development under X-rays.

[0043] Specifically, the marker ring 18 is made of platinum-iridium alloy to ensure real-time graphics under X-rays, thereby facilitating observation of the position of the outer sheath 4 during surgery.

[0044] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A special urinary catheter for increasing the contact area of drug treatment in the bladder cavity, characterized in that: include: An inner core (1), the inner core (1) being a hollow tubular structure, having a thin film water bag (2) provided at its front end and a water injection hole (3) provided at its rear end, the water injection hole (3) being connected to the thin film water bag (2) through the hollow tubular structure; An outer sheath (4), wherein a through accommodating channel (5) is formed along an axis in the outer sheath (4) to accommodate the inner core (1), and a drug channel (6) is formed along a length direction of the outer sheath (4), and the drug channel (6) forms a drug outlet (7) and a drug inlet (8) at the front end and the rear end of the outer sheath (4), respectively; The inner core (1) is arranged to slide relative to the outer sheath (4); the thin film water bag (2) can be deformed and move along the accommodating channel (5) when in a collapsed state; the water injection hole (3) is used to inject water into the thin film water bag (2) when the thin film water bag (2) is pushed out of the accommodating channel (5); after the thin film water bag (2) is expanded, a drug accumulation cavity (9) is formed between the thin film water bag (2) and the bladder wall.

2. A special urinary catheter for increasing the contact area of drug treatment in the bladder cavity according to claim 1, characterized in that: The shape of the film water bag (2) is adapted to the shape of the bladder, and a constraint component is provided between the inner core (1) and the outer sheath (4), and the constraint component is used to constrain the inner core (1) to move linearly relative to the outer sheath (4).

3. A special urinary catheter for increasing the contact area of drug treatment in the bladder cavity according to claim 2, characterized in that: The constraint assembly comprises a constraint block (10) arranged along the length direction of the surface of the inner core (1); the accommodating channel (5) is provided with a constraint groove (11) corresponding to the constraint block (10) and is slidably connected to the constraint block (10); and a gap (12) is formed between the outer wall of the inner core (1) and the accommodating channel (5) through the constraint block (10).

4. A special urinary catheter for increasing the contact area of drug treatment in the bladder cavity according to claim 2, characterized in that: The film water bag (2) comprises an extension section (13), and the extension section (13) is used to be sleeved on the front end of the inner core (1) and glued to the inner core (1).

5. A special urinary catheter for increasing the contact area of drug treatment in the bladder cavity according to claim 1, characterized in that: The surface of the outer sheath (4) is covered with an elastic membrane (14), and the drug channel (6) includes a channel formed by the elastic membrane (14) and the surface of the outer sheath (4) after expansion. A flow limiting structure is provided at the end of the drug channel (6), and the flow limiting structure is used to limit the flow of the drug in the drug channel (6) out along the drug inlet.

6. A special urinary catheter for increasing the contact area of drug treatment in the bladder cavity according to claim 5, characterized in that: The invention also includes a connecting seat (15), wherein a connecting tube (16) is provided on the connecting seat (15) and is connected to the elastic membrane (14), and a plurality of elastic valves (17) are provided in the inner circumference of the connecting tube (16), one end of the plurality of elastic valves (17) is fixed to the inner wall of the connecting tube (16), and the other ends thereof contact each other to seal the connecting tube (16), and the elastic valves (17) are used to deform when under pressure to open the connecting tube (16).

7. A special urinary catheter for increasing the contact area of drug treatment in the bladder cavity according to claim 1, characterized in that: The front end of the outer sheath (4) is provided with a marking ring (18), and the marking ring (18) is used for developing under X-rays.

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