There is a small, unassuming component inside many medical device laser cutting systems that most people never think about until something goes wrong. It is not the laser. It is not the motion control system. It is not the software.
It is the bushing.
If you run a laser stent cutting or laser tube cutting operation, you probably know what we are talking about. If you are adjacent to that process, maybe less so. Either way, this story is worth knowing.
Pezo’s path into Swiss machining started the way most good engineering stories do: someone had a problem nobody else wanted to solve.
A large medical device manufacturer was building out their laser manufacturing capability for cutting stents. To cut a stent, you take a thin metal tube and hold it in position while a laser traces a precise pattern across its surface, turning a solid tube into a flexible, expandable structure. That tube has to be held perfectly still, perfectly concentric, and perfectly consistent run after run.
The part that does that holding is the bushing.
The customer was sourcing theirs from the laser OEM. It worked, but it was not optimized. It was a general-purpose solution for a very specific problem. Tolerance was around plus or minus 0.0005 of an inch. Good enough for many applications. Not good enough for theirs.
They asked if we could do better.
We said yes.
To understand why the bushing matters so much, you have to understand the environment it lives in.
A laser stent cutter is a precision system. The laser itself may cost a million dollars or more. It is moving at high speed, cutting patterns measured in thousandths of an inch, on tubes that can cost around $1,000 each. Every tube that comes off that machine in bad condition is a thousand dollars on the floor.
The bushing is essentially a custom-fit holder for that tube. Think of it like a drill chuck, except instead of clamping down tight, it constrains the tube in a line-on-line fit that allows it to rotate and feed while keeping it perfectly stable. There is high pressure in the cutting environment. There is heat. The bushing is in close proximity to the laser throughout the process.
Two things determine whether it does its job well. First, how precisely it is made. Second, how well it is matched to the specific tube geometry it is holding. There is no universal bushing that fits all applications because the tubes are all different. Wall thickness, outer diameter, material, all of it varies. A one-size-fits-most approach means tolerance stack-up somewhere in the system, and in laser cutting, tolerance stack-up shows up directly in yield.
When Pezo machined bushings to a capability range of plus or minus 0.0001 of an inch, that represented a five-times improvement over what the customer had been working with. Less wobble. Less variation in cut position. More tubes that passed inspection on the first attempt.
The result: roughly 30% better yield.
On a process where each tube can run $1,000, that improvement compounds fast.
One more thing worth knowing: the bushing wears out.
The combination of high pressure, proximity to the laser, and continuous mechanical contact means the inner diameter degrades over time. As it wears, the fit loosens. As the fit loosens, yield drops. Most shops replace them on a regular cycle, though the frequency depends on run volume and material.
This is not a one-time purchase. It is a recurring consumable, like tooling. And because the bushing is custom-fit to a specific tube geometry, sourcing it from someone who can hold precise tolerances matters every time, not just the first time.
The OEM can supply them. But the lead times tend to be long and the cost tends to be high, partly because the OEM is a large company in Germany that is not optimizing for fast, custom, short-run production. Pezo is.
If you are a manufacturing engineer, process engineer, or laser application specialist at a medical device company running stent, catheter, or guide wire laser cutting, this is worth a conversation.
Specifically, if you are running systems from manufacturers like Coherent, Rofin, or ILT, and you are sourcing bushings from the OEM or a generic supplier, it is worth asking whether your yield is as good as it could be.
The bushing is a small part. It is not glamorous. But it directly determines the quality of every cut your laser makes, and by extension, the quality of every device that comes out of that process.
We make them to tight tolerances, custom-fit to your tube geometry, with turnaround times that are competitive with or faster than what you are getting now.
If you want to see what that looks like in practice, we can send samples. Just reply with your address and the tube geometry you are working with, and we will get them out to you.