Ophthalmosurgical Controller Multi-Frequency Oscillation Heat Management
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Solution Overview
Problem
Ophthalmosurgical handpieces generate heat due to mechanical ultrasonic movement, leading to decreased efficiency in breaking up the natural eye lens and potential irreversible damage during phacoemulsification procedures.
Innovation Solution
A controller for ophthalmosurgical systems that provides control oscillations with multiple frequency components, adjusting based on frequency-specific core admittances to precisely control the treatment needle's movement and reduce heat input, using a generator unit with electronic oscillators and amplifiers to set oscillation components at different frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mechanical ultrasonic movement is used to break up the natural eye lens, then the lens can be emulsified and removed, but heat is generated that decreases efficiency and can cause irreversible damage to the eye
Solution Approach 1:
The patent applies periodic action by using oscillating drive signals with multiple frequency components to drive the ultrasonic transducer. The control oscillation includes a first oscillation component at a first control frequency and a second oscillation component at a second control frequency, creating a periodic motion pattern that optimizes lens fragmentation while allowing heat dissipation during the oscillation cycle.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the control frequencies and amplitude ratios of the oscillation components. The ratio of the amplitude of the first oscillation component to the amplitude of the second oscillation component is set according to a first ratio, which can be adjusted to optimize the balance between mechanical cutting efficiency and heat generation. This allows real-time modification of the ultrasonic motion characteristics to maintain effectiveness while minimizing thermal damage.
2Productivity
If the treatment needle is driven with high amplitude oscillation to improve lens fragmentation, then productivity increases, but heat generation increases causing potential eye damage
Solution Approach 1:
By using periodic oscillation with multiple frequency components, the system creates cycles of high-amplitude mechanical action followed by lower-amplitude phases, allowing heat to dissipate during parts of the cycle while maintaining effective lens fragmentation during peak phases.
Solution Approach 2:
The system changes parameters by adjusting the amplitude ratio between frequency components and the frequencies themselves, optimizing the mechanical energy delivery for lens breakdown while controlling the thermal energy input to prevent damage. The controllable ratio of amplitude between first and second oscillation components enables fine-tuning of this balance.
3Device complexity
If single frequency oscillation is used to simplify the control system, then device complexity is reduced, but manufacturing precision of the treatment needle movement is insufficient
Solution Approach 1:
The control approach is segmented by dividing the oscillation into distinct frequency components (first and second oscillation components), each with controlled amplitude and phase. This segmentation allows independent optimization of each component's contribution to the overall motion, improving precision while keeping the control structure manageable through modular signal generation.
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
Improves the efficiency of lens breakdown and reduces heat input into the eye, allowing for more accurate and safer treatment by accounting for frequency-dependent core admittances in the control oscillations of the treatment needle.
Implementation Method 1
the generator unit (4) is configured to provide a control variable (57) for the electrical drive unit (2) with at least one first oscillation component at a first control frequency and with at least one second oscillation component at a second control frequency
Implementation Method 2
heat can be generated on account of the mechanical ultrasonic movement of a treatment needle of a handpiece owing to friction during the operation on the eye
Data Source
AI summary
Provided is a controller for an electrical drive unit—which drives a treatment needle—of an ophthalmosurgical handpiece, comprising a generator unit, which provides a control variable with control oscillation, wherein the control oscillation has a first oscillation component at a first control frequency, wherein the first oscillation component is settable depending on a first ratio of a mechanical deflection amplitude of the treatment needle to the electrical control variable at the first control frequency.It is proposed that the generator unit is configured to provide the control oscillation of the control variable with at least one further oscillation component at a further control frequency, different than any other control frequency, in such a way that the further oscillation component is settable depending on a further ratio of the mechanical deflection amplitude of the treatment needle to the electrical control variable at the respective further control frequency.Furthermore, also provided is a corresponding method, an ophthalmosurgical apparatus and an ophthalmosurgical system.