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What are the material characteristics of disposable silicone catheters
source：www.villmen.com | Release time：2026年06月16日1、 Excellent biocompatibility, low allergy (core medical characteristics)
1. No allergens, low allergy rate
Does not contain natural latex protein, does not induce latex allergy, with an allergy incidence rate of less than 0.1%, suitable for latex allergy patients and long-term retention patients; After complete intradermal sensitization and cytotoxicity testing, the cell survival rate is over 95%, with no inflammation, redness, swelling, or rejection reactions.
2. Biological inertness, not degraded by human body fluids
The main chain of the molecule is a high bond energy Si-O silicon oxygen bond, which cannot be hydrolyzed or enzymatically hydrolyzed by urine or body fluids. It will not release small molecules and cause damage to the urethral mucosa after 2-4 weeks of retention. There is no cytotoxicity or risk of hemolysis.
3. High purity without harmful substance precipitation
The raw materials undergo vacuum devolatilization treatment, VOC、 Oligosiloxanes are strictly controlled, with no residual plasticizers, heavy metals, or sulfides. The total amount of extracted substances meets the limits for medical implants and is safe for long-term contact with mucous membranes.
2、 Flexible and highly elastic properties, comfortable intubation, and less likely to damage the urethra
1. High softness+high rebound memory
Hardness of 40-60A, soft touch that conforms to the physiological curve of the human body; Having good shape memory, it can quickly recover after bending or compression, and the tube body will not collapse or block the tube. It is not easy to compress the urethra and produce foreign body sensation when turning over.
2. High tensile toughness, not easily broken
The elongation at break is greater than 600%, and the airbag extends uniformly after being filled with water. It is not easy to crack after repeated cycles of filling and releasing; The tube body is tear resistant, making it less prone to damage during insertion and removal, significantly reducing the probability of urethral scratches and microscopic hematuria.
3. Smooth inner wall and low frictional resistance
Native low surface energy smooth surface, friction coefficient only one-third of latex; Paired with a hydrophilic coating, the insertion tube is smooth, reducing mucosal friction and injury, and reducing insertion pain.
3、 Chemical stability, resistance to urine corrosion, and resistance to mineral scaling
1. Acid and alkali resistant urine erosion
It does not react with uric acid, calcium salts, or electrolytes in urine, and does not swell or become brittle after long-term immersion; Different from latex, which is easily corroded and aged by urine.
Resistant to calcium salt deposition and less likely to clog the inner cavity
Surface hydrophobicity makes it difficult for urine minerals to adhere and crystallize, and the blockage rate of the inner cavity is much lower than that of latex PVC， Suitable for patients with long-term bed rest and high crystalline urine, reducing the frequency of tube replacement.
2. Disinfectant resistant agents
Can tolerate short-term contact with iodine, alcohol, and medical flushing solution, without swelling or decomposition; Do not use petroleum based lubricants such as Vaseline, as grease can swell silicone and cause airbag rupture and pipeline deformation.
4、 Low bacterial adhesion reduces the risk of catheter-related urinary tract infections
1. Hydrophobic low adhesion surface
The adhesion of bacteria and proteins is 40% lower than that of PVC, making it difficult to form a dense biofilm and reducing the probability of bacterial colonization and retrograde infection.
2. Composite antibacterial modification
The surface of the material can be activated by plasma, grafted with silver ions, heparin, and hydrophilic antibacterial coating, which can effectively prevent Escherichia coli and Pseudomonas aeruginosa, further reducing the incidence of urinary tract infections in the hospital.
5、 Compatible with sterilization process, stable one-time sterile production
1. Wide temperature range thermal stability
Tolerant to temperatures ranging from -60 ℃ to 250 ℃, capable of withstanding high-pressure steam sterilization with ethylene oxide (EO) at 121 ℃. After sterilization, the elasticity and strength remain unchanged, without deformation, yellowing, or release of harmful substances.
2. Disposable without residual aging
After a single sterilization, the performance is stable and there is no residual sulfurizing agent; Not suitable for repeated high temperature and repeated disinfection, in accordance with the specifications for disposable consumables.
6、 Supporting functional materials with additional characteristics
1. Built in developing component (barium sulfate)
Uniformly add contrast agent to the catheter body and balloon segment, and clearly visualize under X-ray, making it convenient for doctors to locate the position of the catheter, investigate displacement and residual fracture issues.
2. Transparent visible substrate
Made of high transparency silicone material, it allows for intuitive observation of urine color, flow rate, and sediment impurities, making it convenient for medical staff to assess the patient's urinary tract condition in real-time.
3. Uniform molding of airbag integrated
The tube body and fixed airbag are extruded from the same type of silicone, without any splicing gaps. After being filled with water, they expand evenly and adhere to the bladder neck at a fixed point, making it less likely to slip or leak.
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