Experimental cataract fragmentation:instrumentation and laboratory evaluation

Area of Science:

• Ophthalmology
• Surgical Technology
• Biomedical Engineering

Background:

• Cataract surgery requires efficient methods for fragmenting the lens nucleus.
• Existing phacoemulsification techniques have limitations, particularly with hard cataracts.
• Novel surgical instrumentation is needed to improve cataract removal outcomes.

Purpose of the Study:

• To evaluate the efficacy and safety of a newly designed mechanical phacofragmentator.
• To assess the device's performance on human hard nuclear cataracts and traumatic animal cataracts.
• To identify and address any iatrogenic complications associated with the new instrument.

Main Methods:

• Testing a turbine-driven, compressed air-powered mechanical phacofragmentator.
• Utilizing 200 human hard nuclear cataracts and 10 traumatic owl monkey cataracts.
• In vitro and in vivo (rabbit and monkey anterior chamber) assessments.

Main Results:

• Successful fragmentation of hard human cataracts in vitro and in vivo.
• No anterior chamber collapse or significant corneal damage observed.
• Initial cases showed iatrogenic iris damage, which was mitigated with operator skill.
• Traumatic monkey cataracts removed without complication, barring one posterior capsule rupture.

Conclusions:

• The mechanical phacofragmentator is effective for hard cataract fragmentation.
• Operator skill is crucial for minimizing iatrogenic iris damage.
• The device demonstrates potential as a safe and efficient tool in cataract surgery.