PCNL vs RIRS: Balancing a Department’s Stone Service

Two pathways to the kidney

PCNL creates a percutaneous tract into the collecting system, typically under fluoroscopy, and passes a nephroscope. RIRS, retrograde intrarenal surgery, advances a flexible ureteroscope through the urethra, bladder and ureter, often through an access sheath, and treats stones with a laser fiber.

The difference in route explains the difference in equipment. PCNL needs puncture and dilation tools, a rigid nephroscope, graspers and a C-arm. RIRS needs a flexible scope, a laser, baskets, sheaths and a camera tower.

Stone size and the PCNL vs ureteroscopy decision

As a general principle, large or complex stone burdens are traditionally associated with the percutaneous route, while smaller stones are commonly approached by ureteroscopy. Many centres also use RIRS for selected larger stones and mini-PCNL variants for mid-sized ones, so the boundary moves with equipment and experience. The choice for an individual patient is made by the surgeon, based on guidelines.

From the equipment side, this means a department that wants the full range should plan for a PCNL set of at least two sheath sizes and a flexible ureteroscope with a laser. See nephroscope sizes and mini-PCNL for the percutaneous sizes.

Equipment profile of RIRS

The flexible side is built around a digital ureterorenoscope. Richard Wolf’s BOA and COBRA scopes have 270° deflection up and down; BOA has an 8.7 Fr shaft and 6.6 Fr tip and fits access sheaths of 9.5 Fr and above, while COBRA adds a 3.6 Fr working channel and a 2.4 Fr laser channel for fibers up to 365 µm so lithotripsy and extraction can proceed in parallel.

Energy comes from a holmium laser; the MegaPulse 70+ provides 70 W at 2100 nm with Lithotripsy mode. Flexible scopes need leak testing and careful drying, so reprocessing capacity belongs in the plan.

• Flexible digital ureteroscope
• Holmium or thulium laser and fibers
• Access sheaths, baskets and guidewires
• Camera controller and monitor
• Reprocessing and leak testing

Equipment profile of PCNL and cost structure

PCNL concentrates cost in the nephroscope set, dilation system, C-arm access and theatre time. RIRS concentrates it in the scope, laser and repair risk of flexible instruments. Both use consumables: PCNL uses sheaths, dilators and drainage; RIRS uses fibers, baskets and sheaths. Our PCNL instruments checklist lists the percutaneous items.

Do not compare only purchase prices. Flexible scopes need repair budgets, and that is a major running cost. Rigid nephroscopes are more robust but need the whole percutaneous chain. Ask suppliers for repair terms and expected lifetime in cases. For flexible options see digital vs fiberoptic flexible ureteroscopes.

Building a balanced stone service

Many departments begin with RIRS and ureteroscopy because the equipment is shared with other endourology, then add PCNL when volume and training justify a fluoroscopy suite. Others build both together. A shared laser and camera tower reduces duplication.

Beckfinity can plan the stone service with you: laser, flexible scopes, percutaneous set and imaging. Send your stone volumes via the contact page and request a quote; also see the Richard Wolf range.