Ureteral Access Sheath Guide for Flexible Ureteroscopy Set-ups

What an access sheath does in flexible ureteroscopy

The sheath consists of an inner dilator and an outer hollow sleeve. Once the sleeve is in position and the dilator removed, the endoscope enters and leaves through the sleeve without contacting the ureteral wall each time. For access sheath flexible ureteroscopy this protects the scope shaft, keeps the working route open and allows irrigation fluid to leave beside the scope.

The surgeon decides whether a sheath is appropriate for a patient. From an equipment point of view, the decision affects which scopes, baskets and laser fibres you stock, so it belongs in the same planning as flexible ureteroscopy equipment.

Ureteral access sheath sizes and lengths

Sheaths are labelled by inner and outer diameter in French (Fr) and by length in centimetres. The inner diameter decides which scope fits and how much space remains for outflow, while the outer diameter relates to the size of the ureteral lumen it must pass. Typical catalogues offer several pairs of diameters and a choice of lengths for shorter and longer anatomy; always read the exact figures on the manufacturer's data sheet.

Match the sheath to the scope. Richard Wolf's BOA ureterorenoscope has an 8.7 Fr shaft and 6.6 Fr tip and is specified for access sheaths of 9.5 Fr and above, while COBRA, with a 5.2 Fr distal tip and a 3.6 Fr working channel plus a 2.4 Fr laser channel, needs a sheath with enough clearance for fluid return. A larger gap between scope and sheath means better outflow and lower pressure in the collecting system.

• Check inner diameter against the scope shaft, not just the tip
• Confirm length options and whether the sheath is hydrophilic coated
• Ask which dilator and guidewire sizes are compatible
• Verify sterile single-use packaging and shelf life

Suction ureteral access sheath: how it differs

A suction ureteral access sheath adds a port or channel for connecting vacuum, so irrigation fluid and fragments can be actively removed rather than relying only on passive flow. Designs differ in how suction is applied: a controlled opening, a side port or a connection to a separate suction pump.

When you evaluate one, ask about the vacuum range specified for use, the tubing and connectors needed, whether the sheath is compatible with your existing scopes and pump, and how to avoid collapse of the collecting system. A suction sheath is an accessory in a larger fluid-management chain, not a replacement for pressure monitoring.

Irrigation pressure, flow and pump choice

Irrigation and sheath size work together. A tight scope-in-sheath fit limits outflow and raises intrarenal pressure, and gravity bags give limited control. A pump with defined flow limits and fluid-deficit monitoring helps the team see what is happening. The Richard Wolf FLUID CONTROL 2225 is a suction and irrigation pump for gynecology, urology and general surgery with a maximum irrigation flow of 1800 ml/min and continuous fluid-deficit display via an optional balancing module.

Ask any supplier how pressure and flow limits are set for urological procedures, how the fluid deficit is measured and which fluids are validated. The pump should also fit the wider room plan described in urology operating room setup.

Buying checklist and next steps

For a UAE hospital, stock a small range of sheath sizes and lengths that match your scopes, record the sheath used in each case and review scope repair causes regularly, since overbending in a sheath is a common source of damage (see flexible ureteroscope reprocessing and care). Check registration and procurement rules with the relevant authorities. Beckfinity can help you configure Richard Wolf scopes, pumps and consumables: request a quote.