One Stripper, Three Wavelengths: Notes on Holmium, Diode, and Thulium Fiber Prep

Keywords:Fiber Stripper  Time:19-08-2026

Most laser suites I visit were built around one wavelength. A hospital starts with a holmium laser for stones, adds a diode laser for prostate ablation a few years later, and then acquires a thulium fiber laser because the rep made a convincing case about soft-tissue efficiency.

The machines arrive with their own carts, their own foot pedals, and their own boxes of proprietary fibers. What rarely arrives is a coherent plan for fiber preparation. Each fiber looks like a thin colored wire to the circulating nurse, and the same stripper that worked on yesterday's blue fiber is often applied to today's green one without a second thought.

This is a mistake. The coatings differ. Holmium fibers for lithotripsy typically carry a thick polyimide buffer and an additional colored jacket to protect against the repeated bending and irrigation fluid exposure inside a flexible ureteroscope. Diode fibers for prostate or tumor work often use a thinner, more pliable polymer jacket because they are handled less aggressively but must pass through small-caliber working channels.

Thulium fibers, being relatively newer in widespread urological practice, frequently arrive with hybrid jackets that combine a silicone buffer with a nylon outer layer to withstand the longer continuous runs these lasers favor.

A stripper designed for a 600 μm holmium fiber can maul a 300 μm diode fiber. A stripper calibrated for a soft silicone buffer can skid on a nylon outer layer and tear it unevenly. After watching our nurses struggle with three different hand tools—each purchased with a different laser system—we decided to test whether a single, adjustable stripper could standardize preparation across all three platforms.

Materials and Methods

We collected 90 unused fibers from the three most common laser systems in our institution: 30 holmium fibers (365 μm core, blue jacket), 30 diode fibers (400 μm core, green jacket), and 30 thulium fibers (272 μm core, amber jacket). Each fiber was stripped with three methods in random order: the manufacturer's supplied disposable stripper, a generic single-diameter mechanical stripper, and a single adjustable clinical stripper set to the fiber's outer diameter.

Each strip was evaluated under 100× magnification for three outcomes: completeness of jacket removal, presence of cladding damage, and straightness of the strip edge. A fiber was rated "acceptable" only if all three criteria were met. We also measured preparation time and recorded operator-reported difficulty on a visual analog scale from 0 to 10.

After preparation, a subset of 45 fibers (15 per wavelength) was passed through a 5.5 mm working channel simulator 20 times to mimic the mechanical stress of ureteroscope passage, then inspected again for coating creep or cladding breach near the strip zone.

The manufacturer's disposable strippers performed best on their native fiber but poorly when borrowed for another wavelength. The generic single-diameter stripper produced the highest rate of cladding damage, particularly on the smaller thulium fibers where the jaw setting was too wide. The adjustable stripper produced the most consistent acceptable ratings across all three fiber types.

The post-channel inspection revealed an additional pattern. On fibers that had been poorly stripped, the mechanical stress of scope passage widened micro-defects. Among the 15 thulium fibers prepared with the generic stripper, five showed coating creep or new cladding breach after the simulator; among those prepared with the adjustable tool, only one did.

Discussion

I am not arguing that one stripper can replace every specialized instrument ever designed. I am arguing that a busy, mixed-wavelength suite benefits from standardization more than it benefits from a drawer full of single-purpose tools. When the nurse knows exactly which instrument to reach for, when the adjustment is dialed in from a laminated card next to the laser cart, and when the outcome is predictable across fiber types, preparation stops being a source of variance.

The adjustable range matters. A multi-wavelength fiber stripper that spans 300–600 μm covers virtually every fiber we handle in endourology. The ability to set the jaw precisely means we are not guessing between "too loose to grip" and "too tight and biting glass." It also means that when a new laser system arrives, we do not automatically need to buy another hand tool.

There is an economic argument here as well. Disposable strippers bundled with proprietary fibers are convenient, but they lock the institution into a consumable stream. A reusable, adjustable fiber stripping tool for the laser suite pays back quickly if the caseload is even moderate. The deeper point, though, is reliability. A fiber that fails mid-case costs more than its sticker price; it costs OR time, anesthesia minutes, and occasionally a second instrument set.

Of course, even the best stripper cannot overcome a nick introduced by clumsy handling. I have written elsewhere about how poor stripping initiates tip fractures under pulse load, because the two subjects are inseparable. The other boundary is reprocessing: any reusable instrument that touches organic material must be cleaned and sterilized with the same rigor as a forceps. That question is covered in our note on keeping reusable strippers contamination-free.

A multi-wavelength laser suite should not be managed as a collection of incompatible fiefdoms. Fiber preparation is a shared workflow, and it deserves a shared, adjustable tool. The data from our 90-fiber comparison suggest that a well-designed clinical stripper can match or exceed proprietary disposables across holmium, diode, and thulium platforms while simplifying training and inventory.