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Comparison of thermal features associated with 2 phacoemulsification machines
Jason P Brinton1, Wesley Adams, Rajiv Kumar
1Department of Ophthalmology and Visual Sciences, University of Utah Health Sciences Center, Salt Lake City, Utah 84132, USA.
Journal of Cataract and Refractive Surgery
|March 28, 2006
Summary
Phacoemulsification machines Legacy Advantec and Sovereign WhiteStar show different thermal characteristics. Continuous ultrasound with blocked aspiration and heavy workload poses the highest risk for incision burns.
Area of Science:
- Ophthalmology
- Surgical Technology
- Biomedical Engineering
Background:
- Cataract surgery relies on phacoemulsification machines.
- Understanding machine thermal profiles is crucial for surgical safety.
- Legacy Advantec and Sovereign WhiteStar are commonly used phacoemulsification devices.
Purpose of the Study:
- To compare the thermal characteristics of Legacy Advantec and Sovereign WhiteStar phacoemulsification machines.
- To evaluate thermal behavior under various clinically relevant conditions.
Main Methods:
- An in vitro study was conducted in water.
- Temperature was continuously monitored on the phacoemulsification sleeve.
- Tests included continuous and pulsed ultrasound, blocked/unblocked aspiration, and varying weights (100g, 200g).
Main Results:
- Sovereign WhiteStar generated higher temperatures than Legacy Advantec under continuous and pulsed ultrasound.
- Blocked aspiration significantly increased sleeve temperature.
- Pulsed ultrasound reduced heat generation by 51-64%.
- Increased weight load had a greater thermal impact on the Legacy Advantec.
Conclusions:
- Phacoemulsification machines exhibit distinct thermal behaviors based on their control mechanisms (stroke length vs. fixed power).
- Workload significantly influences the Legacy Advantec's thermal output.
- Pulsed ultrasound effectively mitigates heat production.
- The highest risk for thermal injury occurs with continuous ultrasound, blocked aspiration, and substantial workload.