TL;DR: ELRA and the Niti-S Biliary Stent play complementary roles in malignant biliary stricture treatment. ELRA targets obstructive intraductal tissue with controlled radiofrequency ablation, while the Niti-S stent helps maintain drainage across the treated segment.
- ELRA delivers temperature-controlled RFA under fluoroscopic guidance to ablate tissue within the stricture before stent placement.
- The self-expanding Niti-S Biliary Stent provides radial support to help keep the bile duct open after ablation.
- Pairing ablation with stenting addresses both tumor-related obstruction and the need for continued luminal patency.
- A 2025 study found longer median primary stent patency when ELRA was used before self-expanding metal stent placement.
- Treatment planning should account for stricture location, branch drainage, prior stents, nearby vessels, and future reintervention needs.
A biliary stricture narrows the bile duct and can interrupt drainage, leading to jaundice or cholangitis and a need for repeat intervention. A biliary stent can reopen the lumen, but stenting alone does not address the tumor tissue responsible for many malignant strictures. Over time, tissue ingrowth or overgrowth can compromise drainage again.
ELRA™ and the Niti-S™ Biliary Stent address different parts of this problem. ELRA delivers controlled intraductal radiofrequency ablation before stenting, while Niti-S provides mechanical support across the treated segment afterward. Used as part of the same treatment strategy, the two technologies can help clinicians address the obstruction and maintain biliary drainage.
What Does ELRA Do Before Stent Placement?
After the stricture is crossed with a guidewire, the bipolar ELRA catheter is positioned across the target under fluoroscopic guidance. Radiofrequency energy creates coagulative necrosis within obstructive tissue, which prepares the lumen for drainage and subsequent stent placement.
ELRA works with the VIVA combo RF Generator to provide temperature and impedance feedback during treatment. Unlike fixed-power systems, temperature-controlled RFA modulates energy around a clinician-selected target temperature. This design is intended to reduce excessive heating and charring within delicate ductal anatomy.
How Does the Niti-S Biliary Stent Maintain Patency?
Following ablation, the catheter is removed, and the self-expanding Niti-S stent is deployed across the treated biliary stricture. Its nitinol construction provides radial force that helps keep the duct open and maintain bile flow.
The uncovered Niti-S Biliary Stent is indicated for palliation of malignant strictures. Its woven, unfixed-cell design is intended to minimize foreshortening while allowing the stent to conform to tortuous anatomy. Radiopaque markers also support accurate fluoroscopic positioning.
Stent diameter, length, location, and branch-drainage strategy should be selected before ablation begins. That way, the full treatment sequence will function like a single, coordinated procedure.
Why Pair ELRA With Biliary Stents?
One way to think about the combination is that each technology serves a different role in maintaining patency. ELRA biliary ablation targets intraductal tumor tissue, while the biliary stent provides ongoing mechanical support across the narrowed segment.
Clinical evidence suggests this approach may improve patency in selected patients. A 2025 patency study found that ELRA before self-expanding metal stent placement extended median primary patency from six to eight months, with no procedure-related major complications reported.
Clinical Considerations for the Combined Approach
Plan the ablation and stent strategy together by assessing:
- Malignant diagnosis and treatment intent
- Stricture length and hilar versus distal location
- Nearby vessels, branch drainage, and prior stents
- The anticipated route for future reintervention
For hilar disease, preserving drainage to the intended liver segments is especially important. The Niti-S indication is specific to malignant strictures, so clinicians should not assume that the same stent strategy is appropriate for benign biliary disease.
Build a More Coordinated Biliary Stricture Workflow
STARMED America supports controlled endoluminal ablation with ELRA technology designed to fit within biliary drainage workflows. Pairing thoughtful ablation planning with appropriate stent selection can help clinicians take a more coordinated approach to malignant biliary stricture treatment.
Contact our team to discuss how endoluminal RFA may fit your approach to biliary strictures.
