UroFlow hydrophilic double-J ureteral stents are part of INVAMED's urology portfolio, designed to support unobstructed urinary drainage between the renal pelvis and bladder while managing patient comfort during the dwell period. This overview summarizes design characteristics relevant to procedural planning; it does not replace the Instructions for Use (IFU).
What Is the Design Intent Behind UroFlow Stents?
UroFlow stents are constructed from biocompatible polymer material intended to provide reliable ureteral support during the management of urological obstructions, whether from stone disease, stricture, extrinsic compression, or post-surgical drainage needs. The double-pigtail configuration — one curl retained in the renal pelvis, the other in the bladder — is designed to reduce the likelihood of stent migration while spanning the ureteral lumen.
What Material Behavior Characterizes the Stent?
A defining feature of the UroFlow line is a polymer formulation that softens at body temperature after insertion. This thermosensitive behavior is intended to reduce friction and rigidity against the ureteral wall relative to a stent that remains stiff throughout the dwell period, which may correspond to reduced irritation-related symptoms during indwelling time. A dedicated Green Series variant is formulated with additional softness, positioned for patients anticipated to be more sensitive to stent-related discomfort.
What Coating and Surface Technology Does UroFlow Use?
UroFlow stents feature an anti-encrustation surface technology intended to reduce crystal deposition and bacterial colonization along the stent lumen and outer surface during extended dwell times. Reducing encrustation and biofilm formation is a widely recognized design goal across the ureteral stent category, since encrustation can complicate later removal and is associated with stent-related infection risk. The hydrophilic coating is also intended to ease insertion by reducing surface friction during deployment over a guidewire.
What Sizing Considerations Apply?
UroFlow stents are available in a sizing range (approximately 4.7–6 Fr diameter, per published product information) with multiple lengths to accommodate variation in ureteral anatomy. Stent length is generally selected based on measured or estimated ureteral length — using imaging, endoscopic measurement, or standard nomograms — and diameter is selected based on the clinical indication and ureteral caliber. As with any ureteral stent, correct sizing is a key procedural variable that affects both drainage adequacy and patient tolerance.
What Are General Placement and Handling Considerations?
Placement is typically performed cystoscopically under fluoroscopic guidance, often paired with a guidewire and, when applicable, alongside another endourological procedure such as ureteroscopy. Standard endourological precautions apply, including confirmation of proximal and distal curl position under imaging before procedure completion. All procedures and implants carry inherent risks, and device selection and technique are determined by the treating physician based on individual patient anatomy and clinical context.
Frequently Asked Questions
What differentiates a hydrophilic stent from a non-coated stent?
Hydrophilic coatings are designed to reduce surface friction during insertion, which may ease deployment, particularly in tortuous or previously instrumented ureters. Coating technology is one of several factors clinicians weigh alongside material stiffness and encrustation resistance.
Is the UroFlow Green Series interchangeable with the standard line in all cases?
Product selection depends on individual patient factors and clinical judgment. Clinicians should consult the applicable IFU and product catalog for indicated use and sizing specifications before selection.
How does anti-encrustation coating affect stent dwell time decisions?
Encrustation resistance is one factor in dwell-time planning, but recommended maximum indwelling duration should always follow the specific product's IFU and institutional protocol, along with individual patient risk factors.
Related INVAMED Resources
- Urology & Incontinence Management products
- What Is a Double-J Ureteral Stent? A Patient Guide
- Living With a Ureteral Stent: Common Questions
Medical Disclaimer: This article is provided for general informational and educational purposes only and does not constitute medical advice, diagnosis, or treatment recommendation. It is not a substitute for consultation with a qualified healthcare professional. Product indications, availability, and regulatory status vary by country. Always refer to the official Instructions for Use (IFU) and consult a licensed physician for guidance specific to your situation. INVAMED devices are intended for use by trained healthcare professionals.