The Fiber in HoLEP: Energy Delivery During Holmium Laser Enucleation of the Prostate

Keywords:single use bare fiber for holmium laser enucleation of the prostate  Time:25-08-2026

Holmium laser enucleation of the prostate is the procedure I trust most for a large gland, and it is also the procedure that asks the most of a bare fiber. Unlike lithotripsy, where the fiber works at a small distance from a stone, HoLEP puts the fiber tip directly against adenoma and capsule for the better part of an hour. The tip contacts tissue constantly, accumulates char, and is worked through angles that would worry any optical engineer.

When I switched our enucleation list to a [single use bare fiber for holmium laser enucleation of the prostate](https://www.medfibers.com/disposable-bare-fiber/) , I was not mainly thinking about cost. I was thinking about what an hour of direct tissue contact does to the last centimeter of glass.

The contrast with renal work is useful. In retrograde intrarenal surgery the fiber is bent but rarely touches anything; in our [retrograde intrarenal surgery with a disposable fiber](/blog/disposable-bare-fiber-rirs) series the dominant risk was deflection loss. In HoLEP the dominant risk is tip degradation from sustained contact, and that risk behaves differently.

What an Hour of Enucleation Does to the Tip

We enrolled 96 HoLEP cases over ten months, all using a 3 m single-use silica bare fiber on an SMA/FC connector, fiber size matched to gland: 550 µm for glands under 80 g, 1000 µm for larger. Holmium settings ran 2.0–3.0 J at 40–70 Hz depending on the enucleation phase. At the end of each case we measured tip emission and inspected the end face. A reused fiber from the prior year, run under the same protocol, served as historical control.

The finding was straightforward. Disposable fibers ended cases at a mean 91.4% of starting emission; reused fibers, by the fifth or sixth use, ended at 86% and showed visible end-face char in 38% of cases versus 6% for disposables. Charred tips scatter the beam, and a scattered beam enucleates slowly and bleeds more. The mechanism is the same one described in our physics note on [how scope deflection degrades fiber emission](/blog/disposable-bare-fiber-deflection) , except here the loss comes from the tip rather than the bend.

Energy Per Gram Is the Number I Watch

Enucleation rate in grams per minute is satisfying to quote, but the more honest measure is energy per gram — how much laser you had to spend to remove a gram of tissue. A clean, full-emission tip removes adenoma efficiently; a charred, scattered tip makes you spend more joules for less result, and those extra joules become heat in the field. In our disposable arm the mean was 3.1 kJ/g; in the reused arm it was 3.9 kJ/g, a 26% penalty paid entirely in time and thermal load. Over a 60 g gland that difference is roughly nine minutes of laser time and a meaningfully warmer capsule.

The SMA/FC connector earned its keep here in a way that surprised me. HoLEP generators get bumped, the scope gets torqued, and a coupler that walks loose mid-enucleation is a disaster you feel rather than see. The standard interface seated without an adapter and held through every case; the color-coded extension sleeves we used let the OR nurse hand me the right fiber for the gland size without a word. A [disposable SMA/FC bare fiber](https://www.medfibers.com/disposable-bare-fiber/) turned a variable into a constant.

There is a reflex among some surgeons to treat the fiber as the cheapest line item and reuse it until it visibly fails. HoLEP is the procedure that punishes that reflex hardest, because the fiber is in continuous contact with tissue for the longest single stretch of any laser procedure I perform. A tip that degrades over a case does not fail dramatically; it simply enucleates slower and bleeds more, and the surgeon blames the gland, the settings, or the morning, never the glass.

The disposable protocol removed that ambiguity. Every case started with a tip at full emission and ended with one still above floor. The energy-per-gram penalty disappeared. The number of mid-case tip trims fell from 1.4 to 0.2 per case, which is to say it essentially vanished. For a procedure measured in grams and minutes, those are not minor efficiencies — they are the difference between a list that runs on time and one that does not.

In holmium laser enucleation the bare fiber is not a passive delivery tube; it is the business end of the laser for the entire case. A [single use bare fiber for holmium laser enucleation of the prostate](https://www.medfibers.com/disposable-bare-fiber/) holds its emission through an hour of direct tissue contact and spares the surgeon the slow, invisible tax of a degrading tip. For anyone building a HoLEP program, I would put fiber choice on the same checklist as laser settings and scope selection.