Ultrasonic Surgical Tool Frequency Control via Dynamic Phase Locking
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Solution Overview
Problem
Ultrasonic surgical instruments face inefficiency and instability due to phase differences at resonance frequencies less than zero, leading to suboptimal performance.
Innovation Solution
A method and system for controlling the frequency of ultrasonic surgical instruments by determining the maximum phase difference between current and voltage, adjusting the frequency to a phase locking point, and dynamically tuning to maintain optimal operation, including formulas and circuitry for phase locking and current management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the system operates at resonant frequency with zero phase locking, then efficiency is maximized, but the system becomes unstable when phase difference is less than zero
Solution Approach 1:
The patent implements dynamic phase locking by making the phase reference value adjustable based on operating conditions. Instead of fixing the phase lock point at zero, the system dynamically determines an appropriate phase reference value that ensures stable operation across different impedance and temperature conditions, thereby resolving the contradiction between efficiency and stability
Solution Approach 2:
The patent changes the phase reference parameter from a fixed zero value to a dynamically determined value based on maximum phase difference calculations. By adjusting the phase locking point according to actual operating conditions (when maximum phase difference is less than zero), the system maintains both efficiency and stability under varying conditions
2Use of energy by moving object
If the phase locking point is fixed at zero for maximum efficiency, then energy utilization is optimized, but the system cannot adapt when resonance phase is less than zero
Solution Approach 1:
The system transitions from a static phase locking approach to a dynamic one where the phase reference value is continuously adjusted based on measured phase differences. This allows the system to adapt energy utilization strategies to actual operating conditions, maintaining efficiency while gaining adaptability
Solution Approach 2:
The patent implements feedback control by measuring the maximum phase difference and using it to adjust the phase locking point. The system continuously monitors phase relationships and adjusts the reference value accordingly, creating a closed-loop control mechanism that adapts energy usage to actual system state
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 the stability and efficiency of ultrasonic surgical instruments by ensuring they operate at optimal resonance frequencies, even when initial phase differences are less than zero, thereby improving surgical performance.
Implementation Method 1
the resonant frequency is easy to drift by impedance and temperature. For the high efficiency of the instrument, the driving frequency should be put at resonance around
Implementation Method 2
the blade acts on the tissue to achieve cutting and coagulation effect
Data Source
AI summary
A frequency control method and system for an ultrasonic surgical tool. The frequency control method for an ultrasonic tool comprised: obtaining a maximum value of a phase difference between an operating voltage and an operating current of the ultrasonic surgical tool; determining whether the maximum value is less than zero, so as to obtain a first determination result; if the first determination result indicates that the maximum value is not less than zero, adjusting an operating frequency of the ultrasonic surgical tool to a frequency corresponding to the phase difference to zero; if the first determination result indicates that the maximum value is less than zero, subtracting a preset value from the maximum value to obtain a phase lock point; and adjusting, according to the phase lock point, the operating frequency of the ultrasonic tool. The frequency control method for an ultrasonic surgical tool solves a problem in which, in some situations where the phase of a self-resonant frequency does not exceed 0, ultrasonic surgical tools fail to operate normally, or operate inefficiently, thereby improving operation efficiency and stability of ultrasonic surgical tools.