Pulsed Ultrasonic Tip Control for Lower Heat Tissue Resection
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Solution Overview
Problem
Conventional ultrasonic instruments generate high temperatures and increase trauma to surrounding tissues due to high velocity vibrations, affecting instrument operation and tissue integrity.
Innovation Solution
A system for controlling ultrasonic instrument vibrations by generating AC drive signals that induce ultrasonic energy in the form of pulsed energy pulses interspaced by periods at minimum energy levels, with adjustable pulsing parameters based on tissue type and mode, and incorporating an irrigation conduit for reducing heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional ultrasonic instruments operate at high velocity vibrations to remove target tissue, then tissue resection effectiveness is improved, but heat generation increases and trauma to surrounding tissues worsens
Solution Approach 1:
The patent applies periodic action by delivering ultrasonic energy in pulsed intervals rather than continuous operation. The control system delivers ultrasonic bursts separated by pause periods, allowing heat dissipation between pulses while maintaining effective tissue resection during active pulses. This periodic delivery pattern resolves the contradiction by enabling productive tissue removal when energy is applied while allowing temperature reduction during pause intervals.
Solution Approach 2:
The patent implements dynamics by making the ultrasonic energy delivery variable and adaptive rather than static and continuous. The control system dynamically adjusts between active ultrasonic delivery and pause periods based on tissue type, surgical goals, and real-time feedback. This dynamic control allows the system to optimize the balance between resection effectiveness and heat management by adapting the duty cycle and pulse parameters.
2Productivity
If conventional ultrasonic instruments use high velocity vibrations for tissue removal, then cutting performance is improved, but trauma to surrounding tissues increases
Solution Approach 1:
The periodic delivery of ultrasonic energy in controlled bursts allows effective cutting during active pulses while reducing trauma during pause periods. The intermittent operation pattern limits the cumulative thermal and mechanical stress on surrounding tissues while maintaining cutting performance when the ultrasonic energy is actively delivered, thus resolving the contradiction between cutting effectiveness and tissue trauma.
Solution Approach 2:
The patent applies parameter changes by modifying the duty cycle, pulse duration, and inter-pulse intervals of ultrasonic energy delivery. By adjusting these parameters based on tissue type and surgical requirements, the system optimizes cutting performance while controlling the extent of trauma to surrounding tissues. Different parameter sets can be selected for different tissue types to balance cutting efficiency and tissue preservation.
3Productivity
If ultrasonic energy is delivered continuously for effective tissue resection, then productivity is improved, but heat generation and loss of energy increase
Solution Approach 1:
Periodic ultrasonic energy delivery in pulsed intervals improves energy efficiency by allowing the system to maintain effective tissue resection rates during active pulses while reducing energy consumption during pause periods. The intermittent operation eliminates the need for continuous high-energy delivery, thereby reducing overall energy loss while maintaining productive tissue removal capability.
Solution Approach 2:
The pause periods in the pulsed ultrasonic delivery, which might initially seem to reduce productivity, actually convert potential harm (excessive heat generation and energy waste) into benefit. The pause periods allow heat dissipation and energy recovery, preventing energy loss through excessive heating while maintaining effective resection rates, thus turning what could be a productivity-reducing factor into an energy-saving mechanism.
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
Reduces heat generation and trauma to surrounding tissues while maintaining effective tissue resection rates, providing improved tissue selectivity and control.
Implementation Method 1
Conventional ultrasonic instruments remove target tissue by vibrating against the target tissue at a high velocity
Implementation Method 2
The high velocity vibrations produced by the conventional ultrasonic instrument can generate high temperatures that affect operation of the instrument and increase trauma to surrounding tissues
Data Source
AI summary
Systems and methods for controlling vibrations of a tip of an ultrasonic instrument. A maximum ultrasonic energy level for the ultrasonic instrument is determined, and a minimum ultrasonic energy level for the ultrasonic instrument is determined based on the maximum ultrasonic energy level. An AC drive signal is then sourced to the ultrasonic instrument that induces ultrasonic energy in the tip of the ultrasonic instrument including several ultrasonic energy pulses. The ultrasonic energy pulses peak at the determined maximum ultrasonic energy level and are interspaced by significant periods at the determined minimum ultrasonic energy level.