Cataract Lens Hardness Based on Phaco Tip Resistance
Study Details
Study Description
Brief Summary
Phacoemulsificaton tip elongation depends upon voltage once resonant frequency of piezoelectric crystals has been reached.
Purpose of the study is to record voltage data of 20 consecutive cataract surgeries in order to evaluate correlation between voltage and LOCS classification of lens nuclei using a system that deploys a feedback mechanism capable of keeping invariant elongation regardless of enountered resistence
| Condition or Disease | Intervention/Treatment | Phase |
|---|---|---|
|
|
Detailed Description
The R-Evolution (Optikon 2000 Rome, Italy) phaco machine is equipped with a patented system named "minimal stress" that used the direct piezoelectric effect from the resonant ceramics that drive the phacoemulsificator tip to assess in real time and adjust phaco tip elongation that continuously varies according to encountered resistance.
After priming in balanced salt solution, phaco tip elongation and the amount of potential difference (voltage) needed to obtain a ginev elongation in balanced solution is assessed. Once the phaco tip is used during surgery, the resistence offered by the crystalline lens material to the phaco tip reduces actual elongaton which in turn reduces the voltage produced by the directo piezometric effect. The machine uses voltage produced by actual elongation to adjust the diving voltage and therefore can ensure accurate pahco tip elongation under any condition of lens material resistance.
Purpose of the study is to record driving voltage and its variations and evaluate if there is a correlation between phaco tip resistence and drving voltage.
This is evaluated both in vitro activating the phaco tip in increasingly dense glycerol solutions and in real life phaco surgery recording the voltage requested by phaco tip resistence and correlating it to the classification of lens opacity (LOCS III system) clinically used to grade cataract hardness.
Study Design
Outcome Measures
Primary Outcome Measures
- cataract lens hardness according to LOCS III classification system [at enrolling]
lens opacity and estimated nucleous hardness according to international LOCS classification
- average voltage [at the time of surgery]
voltage necessary to emulsify cataratct nuclous
- peak voltage [at the time of surgery]
maximum voltage necessary to emulsify cataract nucleous
Eligibility Criteria
Criteria
Inclusion Criteria: diagnosis of nuclear or cortical cataract
Exclusion Criteria: previous ocular trauma, previous ocular surgery, connective tissue disease
Contacts and Locations
Locations
| Site | City | State | Country | Postal Code | |
|---|---|---|---|---|---|
| 1 | IRCCS Policlinico San Martino | Genoa | Italy | 16100 |
Sponsors and Collaborators
- Ospedale Policlinico San Martino
Investigators
- Principal Investigator: Tommaso Rossi, MD, IRCCS Policlinico San MArtino
Study Documents (Full-Text)
None provided.More Information
Publications
None provided.- 1/2021