Medication injection catheter and multi-lumen visualized urinary catheter

Abstract

The application discloses a medicine injection catheter and a multi-cavity visualized urinary catheter, which comprises a urinary catheter body, characterized in that a urinary cavity is arranged in the urinary catheter body, a wire-shaped endoscope can be inserted into the urinary cavity, a urinary interface and a urinary opening are arranged at the tail part and the head top end of the urinary cavity, a conical wire clamping assembly is sleeved with a plug on the inner side of the urinary interface port, the conical wire clamping assembly is provided with a middle cavity and can be clamped and sleeved on the periphery of the endoscope, a cavity with a semicircular cross section of a tube cavity is further arranged on the inner side of the urinary catheter body, and the conical wire clamping assembly in the urinary interface port extends to the side wall of the part segment of the urinary cavity provided with a medicine injection cavity. The simple conical wire clamping assembly is arranged on the structure, the fixed positioning of the endoscope at any position and the center part of the urinary catheter is realized, and the medicine liquid can be reduced to stay or reflux in the cavity; the multifunctional integrated operation of medicine liquid injection, detection and urinary catheterization is realized, and the application is very flexible and practical.

Description

Technical Field

[0001] This invention relates to the field of urinary catheter technology, specifically to a drug infusion catheter and a multi-lumen visual urinary catheter for use in urinary catheters. Background Technology

[0002] A urinary catheter is a device that drains urine from the bladder by inserting it through the urethra. It is a commonly used instrument in hospitals. A visualization urinary catheter, on the other hand, is a type of catheter that uses an endoscope inserted into a cannula to observe the internal condition of the urethra and bladder for diagnostic purposes. After the examination, the endoscope is removed and the catheter is reused. These are mostly double-lumen urinary catheters. When used for observation inside the human urethra, if a temporary fixation of a certain area is required, the insertion position of the endoscope and catheter must be fixed. The existing fixation of the endoscope and catheter is not convenient for flexible use. When medication needs to be injected, there is no corresponding injection cavity. Some existing catheters have additional injection cavities, but multi-lumen catheters will increase the overall diameter of the tube or reduce the diameter of the catheter lumen. When using them, the appropriate outer diameter must first be selected according to the condition of the urethra, and then a double-lumen or triple-lumen catheter can be selected. If the patient has a narrow urethra or a narrow area for testing, multi-lumen catheters are completely unsuitable.

[0003] Furthermore, some catheters with a drug injection chamber suffer from excessive drug retention within the lumen after injection, resulting in poor overall practicality and usability. Even with one-way valves to prevent reflux in the injection chamber and outlet after injection, some urine can still flow into the injection chamber through the outlet.

[0004] Therefore, a multi-lumen urinary catheter based on a drug-injection catheter for urinary catheters, which can realize visual detection, urinary catheterization, and drug injection functions, and has a small outer diameter, flexible fixation, and reliable sealing, is urgently needed for practical use. Summary of the Invention

[0005] To address the problems mentioned in the background section, the present invention provides the following technical solution: a drug-injection catheter, comprising a catheter body, characterized in that the catheter body has a catheter cavity, a wire-shaped endoscope can be inserted into the catheter cavity, a catheter interface and a catheter port are provided corresponding to the tail and head of the catheter cavity, a conical clamping assembly is fitted inside the catheter interface port, and the conical clamping assembly has an intermediate cavity for clamping and fixing to the periphery of the endoscope;

[0006] The catheter body is also provided with a drug injection lumen inside. The drug injection lumen is a cavity with a semi-circular cross-section and is located on the inner wall of the catheter lumen. Correspondingly, the head section and tail section of the catheter body are provided with a drug outlet and a drug injection port.

[0007] The tapered clamp assembly inside the catheterization port extends to the side wall of the catheterization cavity where the drug injection tubing is located.

[0008] The catheter body has an injection chamber with a semi-circular cross-section located on the inner side corresponding to the injection lumen. The head and tail sections of the catheter body are respectively provided with a balloon and an injection port that communicate with the injection chamber. The injection chamber, injection port and balloon are connected. Liquid is injected through the injection port and then guided into the balloon through the injection chamber, causing the balloon to expand and deform. This facilitates the formation of an expansion and fixation structure in the human body during catheterization. This structure is the existing conventional structure of the catheter.

[0009] The drug outlet of the infusion tubing is equipped with an automatic sealing assembly. This assembly includes a fixed rod fixedly mounted inside the catheter cavity, a limiting sleeve connected to the fixed rod, a limiting rod slidably sleeved with the limiting sleeve, a sealing plug connected to the end of the limiting rod, and a spring sleeved on the outside of the limiting rod. The sealing plug has a hemispherical structure and blocks the drug outlet through contact. The head section of the catheter cavity has an opening corresponding to the drug outlet of the infusion tubing. The drug outlet is arc-shaped and matches the curvature of the hemispherical sealing plug. Medication is injected into the infusion cavity under pressure through the injection port. Simultaneously, the injection pressure compresses the spring, causing the sealing plug to detach from the drug outlet, allowing the medication to enter the catheter cavity and then the body through the opening. When no medication is injected, the spring is in its natural state, driving the sealing plug to block the drug outlet.

[0010] The conical clamping assembly includes a first semi-conical clamp and a second semi-conical clamp hinged to one end of the first semi-conical clamp. The two clamps can clamp the wire-shaped endoscope at any position on its periphery. Moreover, since the assembly is located at the port, it can fix the endoscope at any position relative to the center of the catheter, making it flexible and practical to use.

[0011] The fixing rod, limiting sleeve, spring, and limiting rod are all made of plastic.

[0012] The first and second semi-conical clamps are provided with anti-slip protrusions on their inner sides, and both the first and second semi-conical clamps are made of plastic.

[0013] A urinary catheter with the aforementioned infusion lumen is also a type of multi-lumen, visualized urinary catheter.

[0014] Beneficial effects:

[0015] The present invention provides a drug-injection catheter with a tapered clamp assembly for manual internal pressurization, and a three-lumen, visually guided catheter. The simple tapered clamp assembly allows for fixed positioning of the endoscope at any position relative to the center of the catheter. The tapered clamp assembly extends to the sidewall of the drug-injection lumen within the catheter cavity. After drug injection, contact between the tapered clamp assembly and the sidewall of the drug-injection lumen provides manual internal pressurization, reducing drug retention or reflux within the lumen. Furthermore, during drug injection, the drug pushes a sealing plug into the patient's bladder, and the automatic sealing plug seals the outlet of the drug-injection lumen, preventing urine from flowing into the lumen – a highly practical feature.

[0016] This multi-cavity, visually guided urinary catheter features semi-circular injection and fluid infusion cavities located on the corresponding sidewalls of the respective catheterization cavities. This design ensures that the diameter of this catheter is not excessively larger than that of a traditional two-cavity catheter. Furthermore, it enables multi-functional integrated operation for drug injection, monitoring, and catheterization. Attached Figure Description

[0017] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 is Figure 1 Cross-sectional structural reference drawing;

[0019] Figure 3 is a magnified cross-sectional view of the middle of the urinary lumen of the main body of the urinary catheter;

[0020] Figure 4 is an enlarged reference diagram of the tapered clamp assembly in the open state;

[0021] Figure 5 is Figure 2 Enlarged reference diagram of the automatic sealing assembly closing the medicine outlet in Part A;

[0022] Figure 6 for Figure 2 Enlarged reference image of the automatic sealing assembly in Part A opening the medicine outlet.

[0023] In the diagram: 1 - Catheter body, 10 - Injection lumen, 101 - Injection port, 12 - Fixing rod, 13 - Limiting sleeve, 14 - Limiting rod, 15 - Spring, 16 - Sealing plug, 17 - Port, 18 - Injection chamber, 19 - Injection port, 2 - Catheter interface, 21 - Catheter port, 22 - Balloon, 20 - Injection port, 6 - Endoscope, 7 - First semi-conical clamp, 8 - Second semi-conical clamp, 9 - Anti-slip protrusion, 23 - Hinge, 111 - Catheter lumen. Detailed Implementation

[0024] The technical solution of the present invention will now be clearly and completely described in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] The invention will now be further described with reference to the accompanying drawings.

[0027] Please refer to the following: Figures 1-5 The present invention provides a drug injection catheter for use as a drug injection lumen of a urinary catheter, comprising a urinary catheter body 1, wherein the urinary catheter body 1 is a flexible elongated tube, and the tube body has three independent cavities arranged axially inside, namely a urinary catheter lumen 111, a drug injection lumen 10, and an injection lumen 18;

[0028] The urinary catheter cavity 111 is the main cavity of the catheter body 1, used for urine drainage and endoscope insertion. The urinary catheter cavity 111 has a urinary catheter interface 2 at its tail and a urinary catheter port 21 communicating with the bladder at its top. The urinary catheter interface 2 is detachably connected to an external urine collection bag. A wire-shaped endoscope 6 can be movably inserted into the urinary catheter cavity 111. The endoscope 6 is a flexible fiber optic endoscope with an outer diameter smaller than the inner diameter of the urinary catheter cavity 111, and can move freely along the axial direction of the urinary catheter cavity 111.

[0029] The catheter port 2 has a tapered clamping assembly inside. The tapered clamping assembly has a clamping cavity in the middle that is adapted to the outer diameter of the endoscope 6. It is used to clamp and fix the periphery of the endoscope 6 from the catheter port 2, so as to achieve the relative positioning of the endoscope 6 and the catheter body 1. The tapered clamping assembly extends axially along the catheter lumen 111 to the side wall of the tube segment corresponding to the drug injection lumen 10. Its extended end can fit tightly against the outer side wall of the drug injection lumen 10.

[0030] The cross-section of the injection lumen 10 is semi-circular and is located on the inner side wall of the catheterization lumen 111. This structure can minimize the overall outer diameter of the catheter body 1 while ensuring the flow cross-sectional area of ​​the injection lumen 10. The head section of the injection lumen 10 is provided with a drug outlet 101 corresponding to the side wall of the catheter body 1, and the tail section is provided with an injection port 20. The injection port 20 is detachably connected to an external syringe.

[0031] The structure of the injection chamber 18 is completely identical to that of the drug injection lumen 10, and its cross-section is also semi-circular. It is symmetrically located on the inner wall of the catheterization chamber 111 on the other side of the drug injection lumen 10. The head of the catheter body 1 is provided with an annular balloon 22, and the tail is provided with an injection port 19. The two ends of the injection chamber 18 are connected to the balloon 22 and the injection port 19, respectively. After physiological saline or gas is injected through the injection port 19, the fluid is introduced into the balloon 22 through the injection chamber 18, causing the balloon 22 to expand and deform, thereby fixing the catheter body 1 in the patient's urethra or bladder.

[0032] An automatic sealing assembly is provided at the outlet 101 of the injection tube 10. This assembly includes a fixing rod 12, a limiting sleeve 13, a limiting rod 14, a spring 15, and a sealing plug 16. The fixing rod 12 is a cylindrical plastic rod, one end of which is vertically fixed to the inner wall of the catheterization cavity 111, and the other end is integrally formed with the limiting sleeve 13. The limiting sleeve 13 has a hollow cylindrical structure with a sliding cavity inside that matches the limiting rod 14. The limiting rod 14 is a plastic rod coaxially arranged with the limiting sleeve 13, one end of which is slidably fitted into the sliding cavity of the limiting sleeve 13, and the other end is fixedly connected to the sealing plug 16. The spring 15 is sleeved on the outside of the limiting rod 14, one end of which abuts against the end face of the limiting sleeve 13, and the other end abuts against the inner side of the sealing plug 16. The sealing plug 16... Made of hemispherical medical rubber, the drug outlet 101 is arc-shaped and matches the arc of the hemispherical sealing plug 16. Its spherical side is in contact with the drug outlet 101 to achieve a seal. During drug injection, pressure is generated to impact the sealing plug 16 and the spring 15, causing the sealing plug 16 to move away from the drug outlet 101, and the drug solution flows into the cavity. The head section of the catheter cavity 111 has a through-hole 17 corresponding to the position of the drug outlet 101. The through-hole 17 penetrates the side wall of the catheter body 1 and is used to introduce the drug solution discharged from the injection lumen 10 into the patient's body.

[0033] The conical clamping assembly includes a first semi-conical clamp 7 and a second semi-conical clamp 8, both of which are semi-conical structures made of plastic. Their large ends are hinged by a hinge 23, and their small ends are open. The inner walls of the first semi-conical clamp 7 and the second semi-conical clamp 8 are provided with evenly distributed anti-slip protrusions 9, which are made of rubber and used to enhance the friction with the periphery of the endoscope 6 during clamping. When the first semi-conical clamp 7 and the second semi-conical clamp 8 are closed, they form a complete conical sleeve. The inner diameter of the sleeve is adapted to the outer diameter of the endoscope 6, and the endoscope 6 is stably clamped by the contraction force of the conical structure.

[0034] The fixing rod 12, limiting sleeve 13, limiting rod 14, and spring 15 are all made of medical-grade PP plastic, which has good biocompatibility and mechanical strength; the outer walls of the first semi-conical clamp 7 and the second semi-conical clamp 8 are provided with anti-slip textures, which facilitates the grip and application of force by medical staff during operation.

[0035] Based on the above structure and working principle, the following operations can be achieved:

[0036] The catheter body 1 is inserted into the bladder along the patient's urethra. The endoscope 6 is inserted into the catheter cavity 111 through the catheter port 2. After moving the endoscope 6 to the target observation position, the first half-conical clamp 7 and the second half-conical clamp 8 of the conical clamp assembly are closed. Positioning is achieved by the friction between the anti-slip protrusion 9 and the endoscope 6, which prevents the endoscope 6 from shifting during the examination and achieves visual detection and positioning.

[0037] Physiological saline or gas is injected into the injection chamber 18 through the injection port 19. The fluid or gas enters the balloon 22 through the injection chamber 18, causing the balloon 22 to inflate and fit tightly against the inner wall of the urethra or bladder, thereby fixing the main body 1 of the catheter in the body and preventing the catheter from slipping out. This principle structure is also the conventional principle structure of existing catheters.

[0038] Medication Injection: Connect the syringe to the injection port 20 and inject medication into the injection lumen 10 under pressure. The medication pressure overcomes the elastic force of the spring 15, pushing the sealing plug 16 to move inside the catheter cavity 111, causing the sealing plug 16 to disengage from the outlet 101. The medication enters the catheter cavity 111 through the outlet 101 and is injected into the patient's urethra or bladder through the port 17. After the medication is injected, the pressure of the syringe is removed. The closure degree of the conical clamp assembly can still be adjusted so that its extended end applies pressure to the side wall of the injection lumen 10, squeezing the internal space of the injection lumen 10 to achieve manual pressurization. This pushes the residual medication to the outlet 101, thus achieving manual internal pressurization. This reduces the amount of medication remaining in the lumen or backflow, ensuring complete discharge of residual medication. After the medication is discharged and the operation stops, the spring 15 returns to its natural state, pushing the sealing plug 16 to re-seal the outlet 101, preventing the discharge of medication or urine from backflowing.

[0039] Urinary catheterization procedure: After the test and medication injection are completed, the endoscope 6 can be withdrawn and connected to the urine collection bag through the urinary catheterization port 2. The urine in the bladder enters the urinary catheterization cavity 111 through the urinary catheterization port 21 and is finally discharged into the urine collection bag. If continuous observation is required, the endoscope 6 can be kept in its position without affecting the urinary catheterization function.

[0040] A urinary catheter with the aforementioned infusion lumen is also a type of multi-lumen, visualized urinary catheter.

[0041] The catheter body 1 of the above structure can be made of medical silicone, with a length of 40cm and an outer diameter of 5mm. The inner diameter of the catheter lumen 111 is 3mm, and the cross-sectional radius of the drug injection lumen 10 and the liquid injection lumen 18 is 1mm. The three extend along the axial direction of the catheter body 1. The drug injection lumen 10 and the liquid injection lumen 18 are symmetrically distributed on both sides of the catheter lumen 111. Their arc side is integrally formed with the outer wall of the catheter lumen 111, and their flat side is flush with the inner wall of the catheter body 1, ensuring that the surface of the tube is smooth and reducing irritation to the urethra during insertion.

[0042] The first semi-conical clamp 7 and the second semi-conical clamp 8 of the conical clamp assembly are made of medical-grade PP plastic with a taper of 1:5, a large end diameter of 8mm, and a small end diameter of 3.2mm. The anti-slip protrusions 9 on the inner side are made of medical-grade rubber with a height of 0.5mm and a spacing of 1mm. The opening and closing angle can be adjusted from 0 to 90° through the hinge 23. When closed, it can stably clamp the tail wire of the endoscope 6 with an outer diameter of 2.8-3mm.

[0043] In the automatic sealing assembly, the length of the fixing rod 12 is 5mm and the diameter is 1mm; the length of the limiting sleeve 13 is 8mm and the inner diameter is 1.2mm; the length of the limiting rod 14 is 12mm and the diameter is 1mm; the natural length of the spring 15 is 10mm and the elastic coefficient is 5N / cm; the sealing plug 16 has a diameter of 2mm and a spherical radius of 1mm, and can be made of medical silicone rubber. The contact surface with the medicine outlet 101 is provided with a sealing groove to further improve the sealing effect.

[0044] The balloon 22 is a ring-shaped medical rubber balloon with an outer diameter of 5 mm in its natural state and a maximum outer diameter of 12 mm after inflation. The cross-sectional area of ​​the injection chamber 18 is 1.5 mm², ensuring that the balloon 22 can quickly expand to the fixed required size during injection.

[0045] In use, first apply lubricant to the head of the catheter body 1, and slowly insert it into the bladder along the patient's urethra. Insert the endoscope 6 through the catheterization interface 2 to observe the urethra and bladder. After determining the target location, close the conical clamp assembly to fix the endoscope 6. Then, inject 10-20 ml of normal saline through the injection port 19 to inflate the balloon 22 and fix the catheter. If medication needs to be injected, connect the syringe to the injection port 20 and inject the medication under pressure. When the pressure reaches 0.3 MPa, the spring 15 is compressed, the sealing plug 16 opens, and the medication is injected into the body through the outlet 101 and the through port 17. After the injection is completed, remove the pressure or stop manually applying internal pressure, and the sealing plug 16 will automatically reset and seal. Finally, connect the urine collection bag through the catheterization interface 2 to complete the catheterization operation.

[0046] The outer diameter of the catheter body 1 in this embodiment is only 5mm, which is suitable for patients with a urethral diameter ≥6mm. It also realizes the integrated operation of visual detection, catheterization, drug injection and balloon fixation. It is convenient to operate, safe and can be widely used in clinical scenarios such as urology and emergency department.

[0047] It should be noted that the above embodiments are merely preferred embodiments of the present invention and are not intended to limit the present invention. Several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention. For example, the cross-sectional shape of the injection tube 10 and the liquid injection chamber 18 can be adjusted to a semi-elliptical shape according to actual needs; the anti-slip protrusion 9 of the conical clamping assembly can adopt a serrated structure; and the spring 15 of the automatic sealing assembly can be replaced with an elastic rubber component, etc., all of which are within the scope of protection of the present invention.

[0048] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

[0049] Other parts of this invention that are not detailed herein are all prior art and will not be described further here.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A drug infusion catheter, comprising a catheter body (1), characterized in that, The catheter body (1) is provided with a catheter cavity (111), and a wire-shaped endoscope (6) can be inserted into the catheter cavity (111). A catheter interface (2) and a catheter port (21) are provided at the tail and head of the catheter cavity (111). A conical wire clamping assembly is inserted inside the port of the catheter interface (2). The conical wire clamping assembly has an intermediate cavity and can be clamped and fixed on the periphery of the endoscope (6). The catheter body (1) is also provided with a drug injection cavity (10) inside. The drug injection cavity (10) is a cavity with a semi-circular cross-section and is located on the inner wall of the catheter cavity (111). Correspondingly, the head section and tail section of the catheter body (1) are provided with a drug outlet (101) and a drug injection port (20). The conical clamp assembly inside the urinary catheter port (2) extends to the side wall of the urinary catheter cavity (111) where the injection lumen (10) is located. After injecting the drug, the pressure of the syringe is removed, and the degree of closure of the conical clamp assembly can still be adjusted so that its extended end applies pressure to the side wall of the injection lumen (10), squeezing the internal space of the injection lumen (10) to achieve manual pressurization and push the residual drug to the outlet (101).

2. The drug delivery catheter according to claim 1, characterized in that, The catheter body (1) is provided with an injection chamber (18) with the same semi-circular cross-section on the inner side corresponding to the injection lumen (10). The head and tail sections of the catheter body (1) are respectively provided with a balloon (22) and an injection port (19) communicating with the injection chamber (18).

3. The drug delivery catheter according to claim 1, characterized in that, The outlet (101) of the injection tube (10) is provided with an automatic sealing assembly. The automatic sealing assembly includes a fixed rod (12) fixedly installed inside the catheter cavity (111), a limiting sleeve (13) connected to the fixed rod (12), a limiting rod (14) slidably sleeved with the limiting sleeve (13), a sealing plug (16) connected to the end of the limiting rod (14), and a spring (15) sleeved on the outside of the limiting rod (14). The sealing plug (16) is a hemispherical structure, and the sealing plug (16) blocks the outlet (101) in contact. The head section of the catheter cavity (111) has an opening (17) corresponding to the outlet of the injection tube (10).

4. The drug delivery catheter according to claim 1, characterized in that, The tapered clamp assembly includes a first semi-conical clamp (7) and a second semi-conical clamp (8) hinged to one end of the first semi-conical clamp (7).

5. The drug delivery catheter as described in claim 3, characterized in that, The fixing rod (12), the limiting sleeve (13), the spring (15) and the limiting rod (14) are all made of plastic.

6. The drug delivery catheter as described in claim 4, characterized in that, The first semi-conical clamp (7) and the second semi-conical clamp (8) are provided with anti-slip protrusions (9) on their inner sides. Both the first semi-conical clamp (7) and the second semi-conical clamp (8) are made of plastic.

7. A multi-cavity visual urinary catheter, characterized in that, A multi-lumen visual urinary catheter formed by having the drug infusion catheter according to any one of claims 1 to 6.

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