Bipolar vs Monopolar Resectoscope: Choosing for TURP and TURBT

How monopolar and bipolar resection differ

In monopolar resection, current flows from the active electrode through the patient to a return pad, so the irrigation fluid must be non-conductive, such as glycine or sorbitol solutions. In bipolar resection, current passes between two poles on the electrode itself, so conductive saline can be used as irrigation.

This is the main practical difference and the reason many departments move to bipolar. Both techniques use the same type of resectoscope in principle, but the electrode, cable, generator settings and fluid differ.

A practical point for procurement is that moving to bipolar can consolidate stock: one saline fluid for resection and cystoscopy cases, fewer special bags and a simpler pharmacy order. However, bipolar electrodes may cost more per piece than monopolar ones, so compare the total per-case cost, not only the electrode price.

Saline vs glycine and TUR syndrome

Hypotonic, electrolyte-free fluids used in monopolar resection can be absorbed and cause dilutional hyponatraemia, known as TUR syndrome. Bipolar resection in saline removes this specific mechanism, although fluid absorption and overload remain monitored in any resection. Clinical protocols still apply.

For the procurement team this means fluid choice, stocking and monitoring practices change. Saline is more convenient to stock in bulk and removes the need for special non-electrolyte bags in the theatre. See TURP equipment guide for the broader set.

Loops, electrodes and resectoscope size

A resectoscope loop is the cutting wire; bipolar loops are different in construction because they contain both poles. Loops come in different diameters and shapes, and other electrodes such as rollers or buttons are used for vaporisation or coagulation. Loops are consumables: check wear rate, price per piece and compatibility.

Resectoscope size is chosen with the sheath. The Richard Wolf SHARK offers continuous-irrigation sheaths of 22/24 Fr and 24/26 Fr and single sheaths of 24 and 26 Fr, with an inner sheath rotatable through 360°. Confirm that the bipolar electrode and cable fit your working element.

Resectoscope diameter also affects flow. A larger sheath improves irrigation and visibility during bleeding, while a smaller one eases entry; many departments keep two sizes. Ask whether the inner sheath rotates freely, since this helps the surgeon turn the scope without twisting cables.

• Loop diameter and shape
• Roller or button for vaporisation
• Cable and connector type
• Sheath sizes 22/24 and 24/26 Fr
• Cost and wear per electrode

The generator behind a bipolar system

A bipolar system needs a generator with bipolar presets. The HF-GENERATOR 2260 offers presets for monopolar and bipolar TUR-P, TUR-B and bipolar enucleation, with cutting power up to 400 W and coagulation up to 350 W. Bipolar electrode ignition allows cutting without tissue contact, and RFID detection speeds up set-up.

The touch-display navigation helps keep the voltage within the limit permitted for the connected instrument. Ask the supplier how the generator is updated and serviced and whether an existing monopolar unit can be upgraded or must be replaced.

Beyond resection: enucleation and planning

Bipolar energy is also used for enucleation, which we cover in bipolar enucleation of the prostate. For a conceptual overview of the instrument see what is a resectoscope, and for a wider technique comparison see HoLEP vs TURP.

Beckfinity can prepare a bipolar resectoscope configuration with generator, camera and electrodes, and arrange installation and training. Send your case numbers through the contact page and request a quote. Confirm registration requirements with MOHAP, DHA or DOH.