30/06/2026
Oertli CataRhex 3, the right settings!
No gatekeeping.
I have using the CataRhex 3 regularly every week for three years now, and I have operated almost every grade of cataract on this small wonder. However, I have seen a lot of surgeons struggle with the flared tip, the ultrasound power delivery and the fluidics. So here are my settings and your definitive guide to using the machine.
Here goes:
1. The machine runs with a peristaltic pump, and a single flared tip 2.2 to 2.8mm. You will have to impale the nucleus with the tip, occlude it to build vacuum (like in all peristaltic pumps) but because of the wide diameter of the tip, the effort is significantly less (especially if your switching from the Alcon Infiniti, Legion, Centurion — or J&J Signature Pro, Veritas or similar)
2. The fluidics is excellent and is aspiration heavy, so your AFR plays a huge role in the speed of surgery.
3. I usually use three prefixed settings, do not use the SPEEP or Override feature, but have recently started using the OCCM. I will explain the same. There are three Phaco modes — Phaco 1 — sculpt; Phaco 2 — Chop and Quad; Phaco 3 — Epinucleus. Alongside, two IA modes, one configured to traditional IA, and the other for capsular polishing.
4. I am a fast surgeon with a total phaco time of about 0-5 seconds for soft cataracts, and perform direct chop for all grades of cataract. Here are my settings, you may use them as a guide. Phaco (Soft) — V: 350, AFR: 34, US 25%. Phaco 1 (Moderate) — V: 460, AFR: 45, US 45%. Phaco (Hard) — V: 500, AFR: 45, US 50%. US power is delivered in continuous mode.
5. If you can toggle the AFR, with respect to your speed of surgery, that is all that the machine requires because V:350-400 and US: 40% is plenty for this machine.
Finer points:
1. SPEEP — think of this as a pseudo-venture setting for the machine, where you use the footswitch to raise the vacuum without full occlusion. Helpful for beginner surgeons would not be too confident in impaling the nucleus but want to build vacuum to bring the nuclear chunk to the center, functional during Phaco 2 (chop and quadrant)
2. Override — this is SPEEP for IA. Raise the vacuum to pull the peripheral cortex, without occluding the IA tip.
3. OCCM — deliver some extra US power on occlusion. After full occlusion configure the tip to shift to continuous US or raise the US percentage, especially usefully for those extra rock hard cataracts to help the phaco tip tunnel through the chunk.
SPEEP, Override and OCCM — are extremely interesting software modifications that assist the finer aspects of emulsification overcoming the traditional disadvantages of a peristaltic pump system.
And that’s it! All you need to know to run the Oertli CataRhex 3 like a F1 car.
I would love to take up any questions in the comments!