Ultrasonic Spray Medical TPU Catheter

In the field of modern clinical medicine, medical catheters are the core instruments for interventional diagnosis and treatment, and their surface properties play a decisive role in treatment safety and patient comfort. The traditional surface treatment process for catheters generally suffers from problems such as uneven coating and weak adhesion, especially for catheters that require long-term retention or contact with sensitive tissues. Poor surface quality may directly affect the treatment effect. The emergence of ultrasonic spraying technology provides an efficient and reliable solution for surface modification of medical thermoplastic polyurethane (TPU) catheters, which fully preserves the excellent characteristics of TPU material itself and endows the catheter with better clinical performance through precise coating.

The core principle of ultrasonic spraying technology is to achieve atomization of coating materials through high-frequency ultrasonic vibration (usually with a frequency of 20-150kHz). Unlike traditional air pressure spraying, this technology does not rely on high-pressure airflow for propulsion. Instead, it converts electrical energy into mechanical vibration through ultrasonic transducers, allowing the spraying liquid to form uniform droplets at the micrometer or even nanometer level at the nozzle. This unique atomization method effectively avoids the disturbance of air flow on the droplets, ensuring that the droplets can deposit uniformly on the surface of the TPU tube at a stable rate, ultimately forming a continuous coating with controllable thickness (generally adjustable to 5-50 μ m). This coating not only has no common defects such as pinholes and sagging, but also perfectly fits the curved surface of the conduit, fundamentally solving the problem of uneven coating thickness on the surface of the conduit in traditional processes.

Medical grade TPU material itself has excellent performance advantages. It meets international medical device biosafety standards and is not prone to immune rejection or cell toxicity after implantation in the human body. It can be well compatible with human tissues. At the same time, TPU material also has excellent elasticity and fatigue resistance, which can easily adapt to the complex physiological environment of the human body – for example, vascular catheters need to deform slightly with the heartbeat, while urological catheters need to withstand long-term urine immersion and mechanical friction. However, there are still certain shortcomings on the surface of pure TPU catheters, such as high surface friction, which can easily cause tissue damage during insertion; Moreover, the lack of antibacterial properties increases the risk of infection during catheter retention, and ultrasonic spraying technology can precisely address these shortcomings.

In the production process of ultrasonic spray medical TPU catheter, the pretreatment step is crucial. Firstly, plasma cleaning technology is required to remove oil stains, impurities, and small scratches on the surface of the catheter, while activating the molecular activity of the TPU surface, greatly improving the adhesion between the coating and the substrate, and preventing coating detachment during subsequent use. Subsequently, suitable coating materials will be selected according to specific clinical needs: if used in the cardiovascular field, heparin modified anti thrombotic coatings are often selected, which are evenly sprayed on the surface of the catheter through ultrasonic spraying to reduce the adhesion of blood components to the catheter wall and thus reduce the risk of thrombus formation; If the catheter is used for pediatric or elderly patients, medical grade lubricating coatings are often used. By precisely controlling the spraying thickness, the friction coefficient of the catheter surface is reduced by more than 60%, significantly reducing the stimulation of tissue during insertion. During the spraying process, technicians will adjust the ultrasonic frequency, spraying distance (usually maintained at 10-30cm), and catheter rotation speed in real time to ensure that the coating maintains consistent thickness in both the circumferential and axial directions of the catheter. Finally, after low-temperature curing treatment at 40-60 ℃, the TPU material properties are avoided from being damaged by high temperatures, allowing the coating to form a stable bond with the TPU substrate.

At present, medical TPU catheters treated with ultrasonic spraying have been widely used in multiple clinical fields. In cardiovascular intervention therapy, TPU catheters with anti thrombotic coatings can be safely used for coronary angiography or stent implantation surgery, effectively reducing intraoperative thrombotic complications; In urology, TPU catheters with antibacterial and lubricating coatings can significantly reduce the urinary tract infection rate of long-term indwelling patients, and the combination of soft TPU material and smooth coating greatly improves the patient’s wearing comfort; In the field of neural intervention, ultrafine diameter (with an outer diameter of up to 1-2mm) ultrasonic spray TPU catheters can smoothly pass through small intracranial blood vessels, and their precise coating can avoid stimulating nerve tissue, providing a safe guarantee for the diagnosis and treatment of brain diseases.

From the perspective of clinical practice, ultrasonic spraying technology not only significantly improves the performance of medical TPU catheters, but also indirectly improves treatment efficacy and patient prognosis. Relevant data shows that TPU catheters coated with ultrasonic spray antibacterial coatings have a 40% -50% lower infection rate during retention compared to traditional catheters; The anti thrombotic coating catheter reduces the risk of thrombosis related complications in cardiovascular intervention surgery by more than 30%. With the continuous advancement of medical technology, ultrasonic spraying technology can be further combined with functional coating materials (such as intelligent responsive coatings), which is expected to achieve the “on-demand drug release” or “real-time monitoring” function of TPU catheters in the future, continuously expanding the application boundaries of medical catheters and providing stronger instrument support for the development of precision medicine.

About Cheersonic

Cheersonic is the leading developer and manufacturer of ultrasonic coating systems for applying precise, thin film coatings to protect, strengthen or smooth surfaces on parts and components for the microelectronics/electronics, alternative energy, medical and industrial markets, including specialized glass applications in construction and automotive.

Our coating solutions are environmentally-friendly, efficient and highly reliable, and enable dramatic reductions in overspray, savings in raw material, water and energy usage and provide improved process repeatability, transfer efficiency, high uniformity and reduced emissions.

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