Use rounded phaco tips to cut PCR

Kotaro Oki, MD, PhD, used a 2016 Ophthalmology Times Europe article to make a narrow point about cataract safety: the shape of the phaco tip may affect how much damage occurs when the posterior capsule is contacted. He focused on the Dewey Radius Tip, a rounded-edge phaco needle from MicroSurgical Technologies, and described it as functioning like a standard sharp-edged tip while reducing the chance of a capsular tear if contact occurs. Posterior capsule rupture, or PCR, is one of the complications cataract surgeons most want to avoid because it can lead to vitreous loss and later retinal problems. Oki did not present the tip as a universal fix; he presented it as one design change that may make phacoemulsification more forgiving. ### Why does the edge of the phaco tip matter? Oki wrote that standard phaco needles are sharp because they are built to cut cataract material, but that same geometry can turn even brief capsule contact into a rupture. In his framing, the issue is not whether a surgeon intends to touch the capsule, but what happens in the moment when the tip gets too close during nucleus work. (europe.ophthalmologytimes.com) The January 12, 2016 article said the Dewey Radius Tip has rounded inner and outer rims rather than sharp edges. It is available in 0.7 mm and 0.9 mm versions with a 30-degree bevel, according to the article, which said the design was launched in 2006 and credited Steven Dewey, MD, with its development. ### What is the claim for the Dewey Radius Tip? (europe.ophthalmologytimes.com) Oki said the rounded geometry lowers the risk that the iris or posterior capsule will be cut if the instrument touches those tissues. The article described the tip as being used “exactly like” a sharp-edged phaco needle, with no additional training or change in surgical technique required. (europe.ophthalmologytimes.com) Steven Dewey, MD, told the publication that the tip behaves and functions like a sharp-edged phaco needle and can be used on any patient and with any phaco machine, although the article said older generations of phaco equipment might not be compatible. That compatibility caveat matters because the piece was written as a practical device discussion, not as a broad practice guideline. (europe.ophthalmologytimes.com) ### How serious is posterior capsule rupture? Oki wrote that posterior capsule rupture is thought to occur in about 2% of cataract surgeries performed by skilled surgeons. He also said accidental perforation of the capsular membrane can lead to vitreous loss, severe visual disability, cystoid macular oedema and retinal detachment. (europe.ophthalmologytimes.com) The article placed the tip discussion inside that complication chain. It also noted that phacoemulsification is the standard of care in cataract surgery but remains commonly associated with posterior capsule rupture, which is why manufacturers have continued to alter tip design. ### Is this proof that every surgeon should switch? (europe.ophthalmologytimes.com) Oki did not frame the article as definitive comparative evidence that all sharp tips should be abandoned. The piece said he evaluated the Dewey Radius Tip in porcine eyes against standard sharp-edged phaco tips, but the excerpted article available through search does not provide a large human comparative dataset or a randomized clinical trial. (europe.ophthalmologytimes.com) That leaves the article as a device-focused argument about risk reduction at the point of contact. Read narrowly, it is a prompt to examine where PCR risk rises in a given case mix — including dense lenses, last-quadrant removal or nucleus manipulation — and whether current tip choice and machine setup maximize safety margin. That last point is an inference from the article’s device-safety framing, not a direct quoted recommendation. (europe.ophthalmologytimes.com) ### What should a surgeon take from it now? The article’s most concrete takeaway is that forgiving instrument geometry may matter during the exact moments when phaco becomes least forgiving. A rounded tip does not remove the need for case selection, fluidics control or careful positioning, but Oki’s piece argues that it may reduce the consequences of brief unintended contact. (europe.ophthalmologytimes.com) The next step for readers is in the source itself: Oki’s January 12, 2016 Ophthalmology Times Europe article, “Reducing posterior capsular rupture,” names the device, the manufacturer and the porcine-eye evaluation that underpins the claim. (europe.ophthalmologytimes.com)