Surgical Generator With Adaptive Control For Ultrasonic And Electrosurgical Instruments
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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 interchangeable instruments and optimize control processes, and they often expose patients to unacceptable leakage currents due to capacitive coupling.
Innovation Solution
A modular communication hub-based system that executes adaptive ultrasonic blade control algorithms, allowing for simultaneous operation of ultrasonic and electrosurgical instruments with a single generator, which includes a processor to monitor tissue impedance and adjust energy modalities, and provides user and machine feedback through visual, audio, and tactile interfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate generators are used for ultrasonic and electrosurgical devices, then each device can have optimized control, but device complexity and the number of required generators increase
Solution Approach 1:
The generator is designed to provide multiple energy modalities (ultrasonic and electrosurgical) through a single device. The generator includes separate output channels - one for driving ultrasonic transducers and another for delivering electrosurgical RF energy - allowing both functions to be integrated while maintaining optimized control for each modality through dedicated circuitry and control algorithms
2Device complexity
If a single generator provides multiple energy modalities, then device complexity is reduced, but the ability to recognize interchangeable instruments and optimize control processes is limited
Solution Approach 1:
The generator incorporates feedback mechanisms that monitor the state of connected instruments and tissue impedance. Sensors detect instrument type, connection status, and tissue properties, providing real-time information to the control system. This feedback enables the generator to automatically adjust control parameters, optimize energy delivery, and recognize interchangeable instruments for both ultrasonic and electrosurgical operations
Solution Approach 2:
The generator employs dynamic control capabilities that continuously adapt operating parameters based on real-time conditions. Control algorithms adjust frequency, power level, and energy modulation in response to feedback from tissue impedance sensors and instrument status, enabling optimized control for different instrument configurations and tissue types
3Ease of manufacture
If capacitive coupling is used in generator architecture, then circuit design is simplified, but patient safety is compromised due to unacceptable leakage currents
Solution Approach 1:
The harmful capacitive coupling is extracted and isolated from the patient-connected circuits. The generator architecture separates high-voltage capacitive energy storage (used for ultrasonic pulse generation) from low-voltage patient contact circuits through isolation transformers and optocouplers, eliminating the pathway for dangerous leakage currents while preserving the benefits of capacitive coupling in non-patient circuits
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 control of ultrasonic and electrosurgical instruments with improved patient safety by reducing leakage currents and optimizing energy delivery, allowing for interchangeable instruments and enhanced surgical precision.
Implementation Method 1
Vibrating at high frequencies (e.g., 55,500 cycles per second), the ultrasonic blade denatures protein in the tissue to form a sticky coagulum
Implementation Method 2
the ultrasonic blade denatures protein in the tissue to form a sticky coagulum
Implementation Method 3
A processor of the generator is configured to monitor a tissue impedance of the surgical instrument
Data Source
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AI summary
An ultrasonic device may include an ultrasonic system including a transducer coupled to an ultrasonic blade, A method of delivering energy to the device may include sensing a vessel contacting the blade, identifying that the vessel is calcified, and generating a warning. In some aspects, the method further includes disabling one or more activation functions of the blade. In another aspect, the method further includes generating a message to apply compression to the vessel for a predetermined period, disabling activation functions of the blade during compression, and enabling activation functions after the expiration of the compression period. In yet another aspect, the method includes applying a compressive clamp force to the calcified vessel by driving a clamp arm toward the blade, disabling activation functions of the blade during compression, and enabling the activation functions after adjusting the compressive force. An ultrasonic surgical instrument may effect the method.