Phacoemulsification Control Device for Thermal Management
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Solution Overview
Problem
Phacoemulsification systems face challenges in achieving rapid lens emulsification while minimizing corneal heating and tissue damage, as existing techniques often require high energy input, leading to excessive heat generation and potential tissue injury.
Innovation Solution
A control apparatus for phacoemulsification systems that supplies electrical energy in specific time intervals with varying amplitudes, including a high-amplitude interval for emulsification, a pause for cooling, and lower-amplitude intervals to maintain vibration and assess resonant frequency, reducing overall energy input and thermal load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high energy is supplied to the piezoelectric elements to achieve rapid lens emulsification, then the emulsification effectiveness is improved, but the cornea temperature increases excessively causing potential burning
Solution Approach 1:
The patent applies periodic pulsed operation instead of continuous high-energy supply. The control device supplies electrical energy in defined time intervals (pulses) with specific duty cycles, allowing the phaco needle to emulsify lens material during active pulses while pausing to allow thermal dissipation during inactive periods. This periodic action resolves the contradiction by maintaining high emulsification effectiveness during pulses while preventing excessive cornea temperature through intermittent operation.
Solution Approach 2:
The patent dynamically adjusts the amplitude and duration of electrical pulses supplied to the piezoelectric elements based on real-time monitoring of cornea temperature or inferred thermal conditions. The control device modifies pulse parameters (amplitude, width, duty cycle) to optimize the balance between emulsification effectiveness and thermal load, transitioning from static high-energy operation to dynamic adaptive control that responds to changing thermal conditions.
2Productivity
If rectangular pulses with high amplitude are used to emulsify the lens, then sufficient emulsification is achieved, but excessive heat is introduced into the tissue
Solution Approach 1:
The patent replaces continuous rectangular pulses with periodic pulsed sequences that have defined active and inactive phases. During active phases, high-amplitude pulses provide sufficient emulsification energy; during inactive phases, energy supply is reduced or stopped to allow thermal dissipation. This periodic modulation of pulse amplitude and duration resolves the contradiction by delivering necessary emulsification energy only when needed while minimizing continuous thermal accumulation in the tissue.
Solution Approach 2:
The patent changes the temporal parameters of the electrical pulses supplied to the piezoelectric elements, specifically introducing variations in pulse amplitude, pulse width, and duty cycle. Instead of using constant high-amplitude rectangular pulses, the system employs modified pulse waveforms with controlled parameter variations that reduce peak power density and allow thermal relaxation, thereby achieving sufficient emulsification while reducing harmful thermal effects on surrounding tissue.
3Loss of time
If continuous high-amplitude vibration is applied to the phaco needle, then complete lens emulsification is achieved quickly, but the risk of corneal burning increases
Solution Approach 1:
The patent implements periodic pulsed vibration of the phaco needle instead of continuous high-amplitude vibration. The control device activates the piezoelectric elements in defined time intervals, creating a pulsed vibration pattern that maintains emulsification effectiveness during active phases while allowing thermal dissipation during inactive phases. This periodic action resolves the contradiction by achieving complete lens emulsification within an acceptable time frame while significantly reducing the continuous thermal load that causes corneal burning.
Solution Approach 2:
The patent maintains continuous useful action by ensuring that the pulsed vibration pattern provides sufficient emulsification during active phases while the pauses between pulses allow for thermal management. The system is designed so that the cumulative emulsification effect over multiple pulses achieves complete lens removal, while the intermittent nature of the pulses prevents excessive heat accumulation. This approach preserves the continuity of the surgical procedure while managing thermal risks.
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
Enables effective and efficient lens emulsification within a short period with reduced thermal load on the cornea, ensuring good particle suction and minimal risk of corneal burning, allowing for adaptable energy input based on surgical conditions.
Implementation Method 1
supplying electrical energy to an actuator in the form of piezoelectric elements such that the actuator, with the hollow needle coupled thereto, vibrates in the region of the resonant frequency
Implementation Method 2
the vibrating hollow needle emulsifies the eye lens such that the resulting lens particles can be aspirated
Implementation Method 3
vibrates in the region of the resonant frequency
Data Source
AI summary
A control apparatus for a phacoemulsification system is disclosed. The control apparatus is configured to supply electrical energy to an actuator for a phaco needle during a plurality of time intervals, wherein the time intervals includes a first time interval, in which electrical energy for pulses with a constant maximum amplitude is supplied, a second time interval following the first time interval, wherein electrical energy with a value equal to zero is supplied, and a third time interval following the second time interval, wherein the third time interval has a first time duration in which electrical energy for pulses which have a lower constant amplitude than the maximum amplitude during the first time interval is supplied.