If you talk to any urological device manufacturer, you will quickly learn that material selection directly shapes clinical outcomes, especially for implantable ureteral stents. For years, producers searched for polymers that balance flexibility, safety and processing performance, and medical-grade thermoplastic polyurethane (TPU) has steadily become the industry standard solution.
Ureteral stents, also known as double J stents, stay inside the human urinary tract for weeks or months after kidney stone surgery, stricture treatment and other urological procedures. This long-term contact environment sets extremely high requirements for raw materials. Our dedicated TPU grades for ureteral stents fully comply with ISO 10993 biocompatibility standards. They trigger minimal tissue irritation and inflammatory reactions, a core advantage over many ordinary flexible polymers on the market.
One standout characteristic is balanced mechanical performance. The material maintains enough tensile strength to resist fracture during extrusion, tube forming and clinical placement. Meanwhile, it delivers appropriate softness once exposed to human body temperature. This temperature-responsive flexibility greatly reduces friction against ureteral mucosa, cutting patient discomfort after implantation. Many manufacturers we cooperate with highlight this feature as a key selling point for their finished stents.
Hydrolysis resistance is another non-negotiable indicator. Stents sit continuously in urine with complex ions. Low-quality polymers tend to degrade easily, causing material cracking and increased encrustation risk. Our ureteral stent-specified TPU adopts optimized polyether formula to slow hydrolysis inside the body. It supports safe indwelling cycles as commonly used in clinical practice.
Additionally, the raw material shows stable compatibility with common sterilisation methods including ethylene oxide and gamma irradiation. No obvious yellowing or sharp performance drop occurs after standard disinfection treatment. It supports adding radiopaque fillers evenly during extrusion, allowing clear visibility under X-ray for doctors to confirm stent position.
We have supported dozens of medical device factories globally in material switching and trial production. Many clients used silicone or generic PU before, and finally shifted to our medical TPU after clinical comparison. For device developers launching new ureteral stent lines, choosing purpose-built medical TPU removes many hidden risks in product registration and mass production.