Medical catheter

Abstract

The utility model provides a kind of medical catheter, including catheter body, the catheter body includes base layer, first functional layer and second functional layer, the material of base layer is soft silica gel, first functional layer and second functional layer are sequentially stacked in the outside of base layer, first functional layer and second functional layer are all multilayer structure, first functional layer includes silver nanoparticle polymer composite layer and quaternary ammonium salt modified hydrophilic polymer layer, by the setting of first functional layer and second functional layer, with multiple synergistic antibacterial mechanism, not only can be realized broad-spectrum sterilization by silver ion and copper zinc ion sustained release, quaternary ammonium salt and chitosan can also be effectively inhibited bacterial attachment and biofilm formation, while hydrophilic lubricating layer significantly reduces the friction irritation when using, improve patient comfort, antibiotic slow-release structure provides long-term infection protection, overall substantially reduces catheter-related infection incidence, prolongs the safe use period of catheter body.

Description

Technical Field

[0001] This utility model relates to a medical urinary catheter, belonging to the field of medical supplies technology. Background Technology

[0002] A urinary catheter is a medical device used to drain urine. It is typically made of soft rubber, silicone, or plastic and is inserted into the bladder through the urethra to help patients urinate. It is commonly used for postoperative recovery, urinary dysfunction, coma, or prolonged bed rest. Types of urinary catheters include intermittent catheters and indwelling catheters. Aseptic technique must be observed during catheterization to prevent urinary tract infections.

[0003] Authorization announcement number (CN 213554161 U) discloses a urinary catheter, including a catheterization cavity and an injection cavity. The catheter has a balloon at the front that communicates with the injection cavity. The front of the balloon has a urine outlet that communicates with the catheterization cavity, and the rear of the balloon has a urine outlet that communicates with the catheterization cavity. The catheter body is marked with graduations. This utility model provides a urinary catheter with an additional urine outlet below the balloon. This structure allows urine below the balloon to be discharged through the urine outlet below the balloon, minimizing urine residue in the bladder and reducing urine leakage.

[0004] However, the above-mentioned technologies may have insufficient antibacterial effects during use, easily causing catheter-related urinary tract infections, leading to inflammation of the urethral or bladder mucosa, significantly increasing the risk of bacteria attaching and multiplying on their surface, and even further spreading to the kidneys, causing cystitis, pyelonephritis, and in severe cases sepsis, resulting in treatment difficulties, prolonged hospitalization and increased medical costs, and even endangering the patient's life.

[0005] Therefore, a medical catheter is proposed. Utility Model Content

[0006] In view of this, the present invention provides a medical catheter to solve or alleviate the technical problems existing in the prior art, and at least provides a beneficial alternative.

[0007] The technical solution of this utility model is implemented as follows: a medical catheter includes a catheter body, the catheter body includes a base layer, a first functional layer and a second functional layer, the base layer is made of soft silicone, the first functional layer and the second functional layer are stacked on the outside of the base layer, both the first functional layer and the second functional layer are multi-layer structures, the first functional layer includes a silver nanoparticle polymer composite layer and a quaternary ammonium salt modified hydrophilic polymer layer, the second functional layer includes a copper-zinc alloy microparticle reinforced coating and a chitosan-antibiotic sustained-release layer.

[0008] More preferably, the catheter body has a urine outlet at its front end, a drainage tube connected to the front end of the catheter body, and a balloon connected to the catheter body.

[0009] More preferably, the first functional layer is disposed on the outside of the base layer, and the second functional layer is disposed on the outside of the first functional layer.

[0010] More preferably, the silver nanoparticle polymer composite layer is disposed on the outside of the substrate layer, and the quaternary ammonium salt modified hydrophilic polymer layer is disposed on the outside of the silver nanoparticle polymer composite layer.

[0011] More preferably, the copper-zinc alloy microparticle-reinforced coating is disposed on the outside of the quaternary ammonium salt modified hydrophilic polymer layer, and the chitosan-antibiotic sustained-release layer is disposed on the outside of the copper-zinc alloy microparticle-reinforced coating.

[0012] More preferably, the silver nanoparticle polymer composite layer and the quaternary ammonium salt modified hydrophilic polymer layer have the same thickness, and both are 5μm-10μm.

[0013] More preferably, the copper-zinc alloy microparticle-reinforced coating and the chitosan-antibiotic sustained-release layer have the same thickness, both being 10μm-15μm.

[0014] The present invention has the following advantages due to the adoption of the above technical solution: This invention, through the design of a first functional layer and a second functional layer, possesses multiple synergistic antibacterial mechanisms. It not only achieves broad-spectrum bactericidal effects through the continuous release of silver and copper-zinc ions, but also effectively inhibits bacterial adhesion and biofilm formation by utilizing quaternary ammonium salts and chitosan. At the same time, the hydrophilic lubricating layer significantly reduces frictional irritation during use, improving patient comfort, while the antibiotic sustained-release structure provides long-term infection protection. Overall, it significantly reduces the incidence of catheter-related infections and extends the safe service life of the catheter.

[0015] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present invention will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a three-dimensional front view structural diagram of the present invention; Figure 2 This is a schematic diagram of the urinary catheter body structure of this utility model; Figure 3 This is a schematic diagram of the first functional layer structure of this utility model; Figure 4 This is a schematic diagram of the second functional layer structure of this utility model.

[0018] Reference numerals: 1. Catheter body; 101. Base layer; 102. First functional layer; 1021. Silver nanoparticle polymer composite layer; 1022. Quaternary ammonium salt modified hydrophilic polymer layer; 103. Second functional layer; 1031. Copper-zinc alloy microparticle reinforced coating; 1032. Chitosan-antibiotic sustained-release layer; 2. Urine outlet; 3. Drainage tube; 4. Balloon. Detailed Implementation

[0019] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0020] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0021] Example 1 like Figure 1-4As shown, this utility model embodiment provides a medical urinary catheter, including a catheter body 1. The catheter body 1 includes a base layer 101, a first functional layer 102, and a second functional layer 103. The base layer 101 is made of soft silicone. The first functional layer 102 and the second functional layer 103 are sequentially stacked on the outside of the base layer 101. Both the first functional layer 102 and the second functional layer 103 are multi-layered structures. The first functional layer 102 includes a silver nanoparticle polymer composite layer 1021 and a quaternary ammonium salt modified hydrophilic polymer layer 1022. The second functional layer 103 includes a copper-zinc alloy microparticle reinforced coating 1031 and a chitosan-antibiotic sustained-release layer 1032. A urine outlet 2 is provided at the front end of the catheter body 1. A drainage tube 3 is connected to the front end of the catheter body 1. A balloon 4 is connected to the catheter body 1. A first functional layer 102 is disposed on the outside of a base layer 101, a second functional layer 103 is disposed on the outside of a first functional layer 102, a silver nanoparticle polymer composite layer 1021 is disposed on the outside of a base layer 101, a quaternary ammonium salt modified hydrophilic polymer layer 1022 is disposed on the outside of a silver nanoparticle polymer composite layer 1021, a copper-zinc alloy microparticle reinforced coating 1031 is disposed on the outside of a quaternary ammonium salt modified hydrophilic polymer layer 1022, and a chitosan-antibiotic sustained-release layer 1032 is disposed on the outside of a copper-zinc alloy microparticle reinforced coating 1031. The silver nanoparticle polymer composite layer 1021 and the quaternary ammonium salt modified hydrophilic polymer layer 1022 have the same thickness, both ranging from 5 μm to 10 μm, and the copper-zinc alloy microparticle reinforced coating 1031 and the chitosan-antibiotic sustained-release layer 1032 have the same thickness, both ranging from 10 μm to 15 μm.

[0022] With the arrangement of the first functional layer 102 and the second functional layer 103, it has multiple synergistic antibacterial mechanisms. It can not only achieve broad-spectrum bactericidal effect through the continuous release of silver ions and copper-zinc ions, but also effectively inhibit bacterial adhesion and biofilm formation by utilizing quaternary ammonium salts and chitosan. At the same time, the hydrophilic lubricating layer significantly reduces friction and irritation during use, improving patient comfort. The antibiotic sustained-release structure provides long-term infection protection, which significantly reduces the incidence of catheter-related infections and extends the safe service life of the catheter body 1.

[0023] In operation, this invention utilizes a silver nanoparticle polymer composite layer 1021 to effectively disrupt bacterial cell membranes and inhibit their metabolic activities. The silver nanoparticles possess broad-spectrum and long-lasting antibacterial activity. Uniformly dispersing them in polyurethane not only stabilizes their release rate but also enhances the layer's flexibility and biocompatibility. Upon contact with urine, they slowly release silver ions, achieving continuous antibacterial action while preventing initial bacterial adhesion to the inner surface of the catheter body 1, thus reducing the risk of infection. Furthermore, the quaternary ammonium salt-modified hydrophilic polymer layer 1022 disrupts bacterial membranes through electrostatic interaction. Quaternary ammonium salts are strong cationic surfactants; combined with polyvinyl alcohol, they form a lubricating hydrogel interface after absorbing moisture, reducing friction and inhibiting bacterial adhesion. This also prevents biofilm formation, making the catheter body 1 easier to clean or replace and extending its service life. For extended lifespan, a copper-zinc alloy microparticle-reinforced coating 1031 is incorporated. Copper and zinc ions possess excellent antibacterial and antiviral capabilities, making it suitable for preventing common urinary tract infections. This coating releases low concentrations of metal ions in the microenvironment, continuously inhibiting bacterial growth. Compared to silver ions, the copper-zinc alloy has a higher killing efficiency against drug-resistant strains and exhibits certain synergistic antioxidant properties, helping to reduce inflammatory responses. The outermost layer, a chitosan-antibiotic sustained-release layer 1032, can carry small doses of antibiotics. Through the sustained-release effect of chitosan, targeted and quantitative drug release is achieved, further enhancing infection control. Chitosan is a natural polysaccharide with biodegradability and broad-spectrum antibacterial properties. It is also friendly to human tissues, and its high adhesion enhances the adhesion between the outer layer material and tissues, preventing pathogens from penetrating the catheter body 1 wall.

[0024] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this utility model, and these should all be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A medical catheter, comprising a catheter body (1), characterized in that: The catheter body (1) includes a base layer (101), a first functional layer (102), and a second functional layer (103). The base layer (101) is made of soft silicone. The first functional layer (102) and the second functional layer (103) are stacked on the outside of the base layer (101). Both the first functional layer (102) and the second functional layer (103) are multi-layered structures. The first functional layer (102) includes a silver nanoparticle polymer composite layer (1021) and a quaternary ammonium salt modified hydrophilic polymer layer (1022). The second functional layer (103) includes a copper-zinc alloy microparticle reinforced coating (1031) and a chitosan-antibiotic sustained-release layer (1032).

2. The medical catheter according to claim 1, characterized in that: The catheter body (1) has a urine outlet (2) at the front end, a drainage tube (3) is connected to the front end of the catheter body (1), and a balloon (4) is connected to the catheter body (1).

3. A medical catheter according to claim 1, characterized in that: The first functional layer (102) is disposed outside the base layer (101), and the second functional layer (103) is disposed outside the first functional layer (102).

4. A medical catheter according to claim 1, characterized in that: The silver nanoparticle polymer composite layer (1021) is disposed on the outside of the substrate layer (101), and the quaternary ammonium salt modified hydrophilic polymer layer (1022) is disposed on the outside of the silver nanoparticle polymer composite layer (1021).

5. A medical catheter according to claim 1, characterized in that: The copper-zinc alloy microparticle-reinforced coating (1031) is disposed on the outside of the quaternary ammonium salt modified hydrophilic polymer layer (1022), and the chitosan-antibiotic sustained-release layer (1032) is disposed on the outside of the copper-zinc alloy microparticle-reinforced coating (1031).

6. A medical catheter according to claim 1, characterized in that: The silver nanoparticle polymer composite layer (1021) and the quaternary ammonium salt modified hydrophilic polymer layer (1022) have the same thickness, and both are 5μm-10μm.

7. A medical catheter according to claim 1, characterized in that: The copper-zinc alloy microparticle-reinforced coating (1031) and the chitosan-antibiotic sustained-release layer (1032) have the same thickness, both being 10μm-15μm.

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