Transverse Phacoemulsification Needle Vibration
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Solution Overview
Problem
Traditional phacoemulsification systems face challenges in achieving both effective cutting efficacy and followability due to maximum heat generation and longitudinal motion causing material repulsion during cataractic lens removal.
Innovation Solution
A phacoemulsification system that vibrates the needle in both transverse and longitudinal directions using a single effective operating frequency, achieved through an asymmetric needle structure and control unit configuration, allowing for controlled transverse and longitudinal motion with reduced power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If maximum power is applied to achieve effective cutting, then cutting efficacy is improved, but heat generation increases causing tissue damage
Solution Approach 1:
The patent applies pulsed ultrasonic power delivery instead of continuous maximum power, creating periodic cycles of high-power cutting followed by lower-power intervals that allow heat dissipation, thereby maintaining cutting efficacy while reducing cumulative heat generation in ocular tissues
Solution Approach 2:
The system dynamically adjusts ultrasonic power levels based on real-time feedback from impedance sensing and phase detection, transitioning between different power states to optimize cutting performance while preventing excessive heat accumulation in the needle and surrounding tissues
2Productivity
If longitudinal motion is used for material removal, then cutting efficacy is improved, but material repulsion occurs reducing followability
Solution Approach 1:
The patent introduces transverse (lateral) vibration perpendicular to the longitudinal axis of the needle, adding a dimensional component to the material removal mechanism that reduces direct longitudinal repulsion forces while maintaining effective emulsification and aspiration followability
3Ease of operation
If transverse vibration is applied to reduce material repulsion, then followability is improved, but cutting efficacy decreases
Solution Approach 1:
The system merges both longitudinal and transverse vibration components into a single ultrasonic needle operation, combining the cutting efficacy of longitudinal motion with the followability benefits of transverse motion to achieve both objectives simultaneously
Solution Approach 2:
The patent modifies the ultrasonic vibration parameters by introducing transverse oscillation components and adjusting frequency and amplitude ratios between longitudinal and transverse modes, thereby optimizing the balance between material removal efficiency and aspirational followability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances both followability and cutting efficacy while minimizing heat generation and material repulsion, providing improved surgical outcomes.
Implementation Method 1
the distal end of which emits ultrasonic energy to emulsify the cataractic lens
Implementation Method 2
a set of piezoelectric crystals, shown as three rings
Data Source
AI summary
The invention is generally directed to phacoemulsification systems and methods, and more particularly to systems and methods for providing transverse phacoemulsification. In accordance with one embodiment, a phacoemulsification system is provided having a handpiece with a needle, wherein the phacoemulsification system is configured to vibrate the distal end of the needle in both an effective transverse direction and an effective longitudinal direction when power, having a single effective operating frequency is applied to the handpiece.