Innovative Chu Instrument


The goal of every cataract surgeon is to give their patients the   best    possible    post­

operative vision. The use of Limbal Relaxing Incisions has proven to be a valuable tool in helping to achieve this goal. One of the challenges in this procedure is producing a clear pattern on the cornea so that the surgeon can make an accurate relaxing incision at the limbus. Commonly, this is accomplished by applying ink to a marker and then imprinting the pattern on the cornea. Often the ink will smear resulting in blurred lines, thereby reducing accuracy. Frustrated by this problem, Y. Ralph  Chu, MD of Edina, Minnesota designed a new marker with an ultra-thin marking surface that can be applied to a dry cornea, leaving a clear pattern with or without the use of ink.

Chu LRI Marker

The Chu LRI Marker features a low-profile degree gauge, with a rotatable marking head for aligning the pattern along axis.  The visible pattern produced by this instrument includes an arc at the 10mm optic zone with landmarks at 30°, 45° and 60°. One key benefit of this marker is the existence of the guiding arcuate line. Dr. Chu states "rather than working between two hash marks, surgeons can literally trace the arc with the diamond knife to create precise LRIs for accurate results."

Chu LRI Knife

Dr_ Chu developed a new multi-purpose diamond knife to complement his marker. The simple dual-setting knife has a 600 micron depth setting which can be used to make limbal relaxing incisions, and a full extension setting of 2.5mm for creating a sideport incision. The knife features a titanium handle and a 1mm wide gem-quality diamond blade with 6-facet double bevel edges for bi­ directional  cutting.    The  single, highly polished footplate provides a smooth gliding surface and serves as a depth guard while permitting full visualization of the blade. The combination of these features allows the surgeon to use one knife for multiple tasks.

Katena Products, inc VOLUME 19 NUMBER 1