Phaco Probe Resonance Sensing With Magnetic Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing phacoemulsification systems face challenges in efficiently maintaining the vibration amplitude and direction of the needle due to changes in mechanical load and temperature, leading to reduced efficiency and potential eye damage or discomfort.
Innovation Solution
The system employs a phacoemulsification probe with a piezoelectric crystal and magnetic-field components, including generators and sensors, to measure and adaptively adjust the drive signal frequency for resonant vibration, and uses multiple piezoelectric crystals driven in independent modes to minimize interaction and maintain optimal vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single piezoelectric crystal is used to vibrate the needle, then the device structure is simple, but the vibration amplitude and direction cannot be precisely controlled under changing mechanical load and temperature
Solution Approach 1:
The single piezoelectric crystal is divided into multiple independent piezoelectric crystals (first and second crystals), each capable of being driven in independent vibration modes. This segmentation allows precise control of vibration amplitude and direction by independently adjusting the drive signals to each crystal, resolving the contradiction between structural simplicity and control precision.
Solution Approach 2:
The system dynamically adjusts the drive signal frequency and phase for each piezoelectric crystal based on real-time detection of needle vibration characteristics. This dynamic adaptation enables precise maintenance of vibration amplitude and direction despite changes in mechanical load and temperature, achieving high control precision without excessive structural complexity.
2Ease of operation
If the drive signal frequency is not adaptively adjusted, then the system operation is simple, but resonance cannot be maintained leading to reduced efficiency and potential damage
Solution Approach 1:
A feedback mechanism is implemented where magnetic sensors detect the actual vibration frequency and amplitude of the needle, and this information is used to adaptively adjust the drive signal frequency. This closed-loop feedback ensures continuous resonance maintenance and reliable operation, preventing efficiency loss and potential damage while keeping the operational interface simple.
Solution Approach 2:
The system performs self-adjustment of the drive signal frequency based on real-time vibration detection, automatically maintaining resonance conditions without requiring manual intervention. This self-service capability ensures reliable resonance maintenance while preserving simple system operation.
3Device complexity
If magnetic field components are not used for sensing, then the device structure is simpler, but vibration measurement precision is insufficient for adaptive control
Solution Approach 1:
Mechanical vibration sensors are replaced with magnetic field-based sensing components. Magnetic sensors detect vibration-induced changes in magnetic flux, providing high-precision measurement of needle vibration characteristics. This substitution achieves superior measurement precision while maintaining relatively simple device structure through non-contact sensing.
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 ensures continuous resonance and efficient needle vibration, reducing heat-related damage and improving surgical precision by accurately controlling amplitude and direction, enhancing the phacoemulsification process.
Implementation Method 1
a piezoelectric crystal configured to vibrate in response to a drive signal
Implementation Method 2
one or more magnetic-field generators configured to generate a magnetic field... causing the magnetic-field sensors to output signals indicative of the vibration
Implementation Method 3
one or more magnetic-field sensors configured to sense the magnetic field
Implementation Method 4
The processor is configured to adaptively adjust a frequency of the drive signal so as to vibrate the needle at a resonant frequency of the piezoelectric crystal
Data Source
AI summary
A phacoemulsification device includes a phacoemulsification probe and a processor. The phacoemulsification probe includes a piezoelectric crystal configured to vibrate in response to a drive signal, a needle configured to be inserted into a lens capsule of an eye and to be vibrated by the piezoelectric crystal, and a set of magnetic-field components. The set includes (i) one or more magnetic-field generators configured to generate a magnetic field, and (ii) one or more magnetic-field sensors configured to sense the magnetic field. At least one of the magnetic-field components is coupled to vibrate with the needle and at least one other of the magnetic-field components is isolated from vibration of the needle, thereby causing the magnetic-field sensors to output signals indicative of the vibration. The processor is configured to adaptively adjust a frequency of the drive signal so as to vibrate the needle at a resonant frequency of the piezoelectric crystal.