Ultrasonic Blade Temperature Control via Resonant Frequency Correlation
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Solution Overview
Problem
Ultrasonic and electrosurgical devices require separate generators due to their unique drive signals and feedback needs, limiting their ability to recognize instrument configurations and optimize control and diagnostic processes, and they face issues with capacitive coupling leading to patient exposure to leakage currents.
Innovation Solution
A method and generator system that determine the temperature of an ultrasonic blade by correlating its actual resonant frequency with a reference resonant frequency, and a combo generator module that integrates ultrasonic, bipolar RF, and monopolar RF energy capabilities, along with a control circuit to manage energy modalities and provide feedback for both ultrasonic and electrosurgical instruments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate generators are used for ultrasonic and electrosurgical devices, then each device can have specialized drive signals and feedback control, but the system complexity increases and instrument recognition capabilities are limited
Solution Approach 1:
The patent combines ultrasonic and electrosurgical energy delivery capabilities into a single generator module. The generator includes separate ultrasonic and RF energy delivery circuits that can independently or simultaneously operate to provide both ultrasonic blade activation and electrosurgical energy delivery through integrated impedance sensing and control mechanisms.
Solution Approach 2:
The generator is designed with multi-functionality to handle both ultrasonic and electrosurgical instruments. It includes adaptive impedance sensing that can recognize different instrument configurations and automatically adjust control parameters, enabling a single device to perform multiple surgical functions with optimized feedback for each modality.
2Adaptability or versatility
If separate generators are used for ultrasonic and electrosurgical devices, then each device can have specialized drive signals, but the ability to recognize instrument configurations is limited
Solution Approach 1:
The generator incorporates continuous impedance sensing that monitors the electrical characteristics of connected instruments in real-time. By analyzing impedance magnitude and phase across different frequencies, the system automatically recognizes instrument type and configuration, then adapts control parameters to optimize performance for the specific instrument being used.
Solution Approach 2:
The system dynamically adjusts operational parameters including drive frequency, power level, and impedance compensation based on real-time instrument recognition. The generator can shift between ultrasonic resonant frequency operation and RF electrosurgical frequency operation, and adjust pulse duration and amplitude based on the detected instrument configuration.
3Power
If traditional ultrasonic generators are used, then ultrasonic energy can be delivered effectively, but capacitive coupling causes patient exposure to leakage currents
Solution Approach 1:
The system introduces an isolated impedance sensing circuit that acts as an intermediary between the ultrasonic transducer and the patient. This isolated sensing path measures transducer impedance without creating capacitive coupling to the patient, thereby eliminating leakage current exposure while maintaining effective ultrasonic power delivery through the primary drive circuit.
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 precise temperature control of ultrasonic blades and simultaneous use of multiple energy modalities for surgical procedures, reducing patient risk from leakage currents and improving instrument recognition and feedback mechanisms.
Implementation Method 1
Vibrating at high frequencies (e.g., 55,500 cycles per second), the ultrasonic blade denatures protein in the tissue
Implementation Method 2
the ultrasonic blade denatures protein in the tissue to form a sticky coagulum
Implementation Method 3
Vibrating at high frequencies... the ultrasonic blade denatures protein
Implementation Method 4
determining an actual resonant frequency of an ultrasonic electromechanical system... wherein the actual resonant frequency is correlated to an actual temperature
Data Source
AI summary
A generator, ultrasonic device, and method of determining a temperature of an ultrasonic blade are disclosed. A control circuit coupled to a memory determines an actual resonant frequency of an ultrasonic electromechanical system comprising an ultrasonic transducer coupled to an ultrasonic blade by an ultrasonic waveguide. The actual resonant frequency is correlated to an actual temperature of the ultrasonic blade. The control circuit retrieves from the memory a reference resonant frequency of the ultrasonic electromechanical system. The reference resonant frequency is correlated to a reference temperature of the ultrasonic blade. The control circuit then infers the temperature of the ultrasonic blade based on the difference between the actual resonant frequency and the reference resonant frequency.