Volume 19, Issue 5 (3-2014)                   Intern Med Today 2014, 19(5): 71-73 | Back to browse issues page

XML Persian Abstract Print

, mhbonyadi@yahoo.com
Abstract:   (4391 Views)
The most common and effective surgical technique for cataract extraction is phacoemulsification. One of proposed mechanisms of phacoemulsification is direct mechanical effect named jackhammer theory. Close mechanical contact between the tip and the nucleus is one of important factors which determine efficacy of jackhammer effect. Clockwise turning of stainless steel screw slightly larger than the inside diameter of a standard phaco tip 1 mm behind the tip boarder made internal clockwise grooves. On the external surface one row of counterclockwise grooves with 1 mm length was made. Designed tip examined in vitro to evaluate efficiency of emulsifying chestnut particles and mature human lens immersed in salin solution. In vitro effective phaco time (EPT) was lesser for double threaded tip compared with internally grooved tip. The anti-directional design of internal and external grooves could improve mechanical adherence. Important consideration with this design is the fact that these grooves create more cavitation . This tip seems useful especially for stony hard nuclei. Future in vivo and clinical studies are needed to better discover features of this design.
Full-Text [PDF 1041 kb]   (2080 Downloads)    
Type of Study: General | Subject: Surgery
Received: 2014/01/31 | Accepted: 2014/03/11 | Published: 2014/03/11

Rights and permissions
Creative Commons License This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.