In 2014 a urology unit at Ninewells Hospital in Dundee published a paper that should have made procurement departments uncomfortable. They had moved from reusable laser fibers to single-use ones, the more expensive option per unit, and their overall costs went down.
The fibers weren’t cheaper. The scopes were. Nine laser-damaged ureteroscopes in the reusable period, three in the single-use period, and £16,800 less spent on repairs. That repair saving was bigger than the extra money spent on fibers.
Two periods, 260 cases on reusable fibers and 265 on single-use. The reusable period used 13 fibers across 185 cases, which works out at fourteen cases per fiber. More than the five to ten that most suppliers rate. Even at that rate the reusable route lost on total cost.
That result gets quoted a lot. The reason gets quoted less. A fiber that has been through the sterilizer a few times picks up microfractures, energy leaks sideways into the working channel, and a flexible ureteroscope costs more to repair than a year of fibers.
Why the spreadsheet usually says the opposite
Almost every comparison that reaches us starts the same way. Unit price times annual volume, two totals side by side, decision made.
What comes out of that is a purchase cost, not a cost per case. Four things sit in between: what you pay per fiber, how many uses you actually get, what one reprocessing cycle costs, and what the scope does when the fiber fails. Only the first one is printed on the quotation.
The arithmetic, with numbers
Take a single-use fiber at 300 and a reusable one at 1,200 rated for fifteen uses. Divide, and you get 80 per case. Add reprocessing at 80 a cycle and you’re at 160. Still looks like half price. This is where most business cases stop.
Now put the failure rate in. If one reusable fiber in ten is retired early, damaged in transit, dropped, fails a leak test, the effective count drops well below fifteen and the per-case figure you presented to finance starts to drift.
The line that actually decides it is this one: your real reuse count has to beat the purchase price divided by the gap between the single-use price and one reprocessing cycle. At 1,200, 300 and 80, that gap is 220 and the break-even sits at about five and a half uses. Get six and you’re ahead. Get four and you’re not, and no discount on the purchase order fixes that.
What the 2026 numbers add
A cost analysis published this year looked at prostate enucleation instead of stones and arrived in a similar place from a different direction. Ten reuses per fiber cut the per-case energy cost from SGD 650 to SGD 95. The authors then asked how many cases a year a hospital needs before the reusable route overtakes the alternative. The answer was 198.
Under that volume, capital and reprocessing overhead don’t spread thin enough. Over it, the gap widens every year the programme runs.
Both studies are small. Dundee is one centre, retrospective, and over a decade old. The 2026 paper is a model built on a single hospital’s cost data. Neither is a trial and I wouldn’t quote either as a general rule. They agree on the mechanism, though, and the mechanism is the part that transfers.
Where the money hides
Reprocessing is the line item people underestimate. It isn’t the autoclave cycle. It’s technician time, packaging, indicators, documentation, and the fact that the fiber is unavailable while all of it happens. Whether that packaging is a sterile single pack or a bulk carton changes both the storage cost and the waste.
Then there’s the chip. Most closed laser platforms have the fiber carry a use-counting chip and the console rejects anything without the right one, which is a supplier lock before it’s a cost. If you’re choosing between laser brands rather than fibers, the connector question is worth more of your time than the price list.
And then the fiber itself. A tip that has been re-cleaved in the OR is not the tip that left the factory, and tip geometry is the first thing to degrade. That is where case times stretch, usually long before anyone checks a cycle count.
What we sell, and why you should weigh it
We make single-use holmium fibers: 2100 nm, up to 120 W, SMA905, low-OH silica core, 200 to 1000 µm, 3.0 m as standard, EO-sterilised in a single pouch with a batch label. HS-272/420-3.0 is the one that leaves the building most often. The same construction goes out as bare fibers for lithotripsy and soft tissue work. Quality system is ISO 13485.
So this is written by someone selling the option that usually costs more per unit. Keep that in mind while you read the rest.
What I won’t do is tell you reusable fibers are unsafe. The evidence doesn’t say that, and a supplier who claims it is arguing rather than calculating. What the evidence does say is narrower. Reuse pays when you can prove the cycle count, absorb the reprocessing cost, and keep the fiber out of your scopes. Lose any one of those three and the saving goes with it.
Three questions, in this order
How many cases a week? Under three, the fixed cost of reprocessing rarely spreads far enough to matter. Over that, do the arithmetic properly.
Can you prove the cycle count? Not “we clean them”. Written limits, records, something that survives an audit. If you can’t produce that, reuse isn’t on the table yet, whatever the price says.
Does your measured reuse beat the break-even? Use your service records. If the fiber gets retired at four cycles because the tip is gone, the fifteen on the box is fiction.
Questions we get
Can a reusable fiber really do fifteen cases?
Sometimes. The rating is a ceiling set by the supplier, not a measurement from your department. What matters is when transmission falls far enough to change your case time, and that number is usually lower than the rating and different in every hospital.
Is it legal to reprocess a single-use fiber where we operate?
Depends on the country, and the answer isn’t a detail. Third-party reprocessing in the US is regulated and needs FDA clearance. In the EU the obligations sit with the processor under MDR. In China single-use devices may not be reused at all. Check that before you check the price, because a saving you’re not allowed to make isn’t a saving.
What do buyers leave out most often?
Staff time and scope repairs. Neither appears on a fiber quotation, and both are bigger than the difference in unit price.
The question worth asking
Not which fiber is cheaper. How many uses can you prove, and what does one failure in the middle of a case cost you.
If you want the arithmetic run against your own volume, send us the case numbers and we’ll put a per-case figure together. If it comes out in favour of reuse at your volume, we’ll say so. The rest of the series lives in the urology section.