Feasibility of a Novel Digital Disposable Semirigid Nephroscope in Suction Mini-PCNL

Overview

This prospective study evaluated the use of a novel digital disposable semirigid nephroscope (DDN) in suction mini-percutaneous nephrolithotomy (mini-PCNL) across 328 patients. The device demonstrated favorable operative times, high stone-free rates, and low complication profiles, supporting its feasibility and potential clinical benefits.

Background

Percutaneous nephrolithotomy (PCNL) has evolved from large-bore instruments to miniaturized scopes to reduce morbidity. Mini-PCNL uses smaller access tracts (≤22 Fr) to minimize tissue trauma and improve recovery. Digital disposable nephroscopes offer advantages such as reduced cross-contamination, ergonomic design, and high-quality imaging. The Redpine™ DDN, introduced in 2024, is lightweight and designed for suction mini-PCNL, aiming to enhance stone management efficiency and patient outcomes.

Data Highlights

Key Findings

• The DDN device weighs 44 g with cables and 34.8 g without, significantly lighter than conventional metal nephroscopes (557 g).
• Operative technique involved use of 14-22 Fr suction nephrostomy sheaths with fluoroscopic guidance and retrograde pyelogram confirmation.
• Stone-free rates were assessed at 4 weeks postoperatively using low-dose NCCT with grading from complete clearance to residual fragments.
• Complications were recorded and graded using Clavien-Dindo classification within 30 days post-surgery.
• Surgeons rated their experience with the DDN on a 5-point Likert scale, capturing usability and ergonomics.
• Statistical analysis showed significance with p < 0.05 for relevant outcomes.

Clinical Implications

The novel digital disposable semirigid nephroscope offers a lightweight, ergonomic alternative to traditional scopes, potentially reducing surgeon fatigue and improving procedural efficiency. Its compatibility with suction mini-PCNL may enhance stone clearance while maintaining low complication rates. Adoption of this technology could support minimally invasive urolithiasis management with improved patient-centered outcomes.

Conclusion

The study supports the feasibility and safety of the Redpine™ digital disposable nephroscope in suction mini-PCNL, demonstrating promising operative and postoperative outcomes. Further research may consolidate its role in routine clinical practice.

References

1. Introduction and device background, Redpine™ 2024
2. Mini-PCNL and suction technology guidelines, International Alliance of Urolithiasis
3. Clavien-Dindo classification for surgical complications, 2004
4. STUMPS protocol for suction technology in mini-PCNL