Electrosurgical Tissue Sealing With Impedance-Cycled Energy Control
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Solution Overview
Problem
Existing electrothermal sealing techniques face inefficiencies due to increasing impedance in biological tissue, leading to prolonged sealing times and risks of tissue damage from overheating, as current adjustments are not accurately responsive to impedance changes.
Innovation Solution
A method involving cycles of high-frequency electrical energy application, where the energy is increased until impedance thresholds are reached, then decreased to allow tissue rehydration, followed by further increases to higher thresholds, optimizing sealing time and reducing tissue damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high frequency electrical current is continuously increased to maintain sealing effect, then sealing effectiveness is improved, but tissue damage from overheating occurs
Solution Approach 1:
The patent implements periodic action by cycling the electrical current through distinct phases: a heating phase where current is increased to achieve sealing, and a cooling phase where current is reduced or interrupted to allow tissue recovery. This periodic pattern enables the tissue to undergo controlled thermal denaturation while preventing sustained overheating that would cause damage.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the electrical current parameters (amplitude, frequency, duration) based on real-time tissue impedance measurements. The system modifies current intensity during different phases of the cycle to optimize sealing while avoiding excessive thermal accumulation, thereby changing parameters adaptively rather than maintaining constant high values.
2Reliability
If current is increased to compensate for rising tissue impedance, then sealing effectiveness is maintained, but procedure time increases and efficiency decreases
Solution Approach 1:
By implementing periodic cycling between heating and cooling phases, the system prevents impedance from rising continuously. The cooling phases allow tissue moisture to be replenished, maintaining lower impedance levels that enable more efficient current flow and faster sealing without requiring progressively higher current intensities.
Solution Approach 2:
The patent incorporates feedback mechanisms where tissue impedance is continuously monitored and used to control the electrical current application. The system adjusts current parameters in real-time based on impedance changes, optimizing the balance between sealing effectiveness and energy efficiency, thereby preventing the need for increasingly high current levels that would reduce productivity.
3Reliability
If longer heating time is applied to denature tissue, then sealing effectiveness is improved, but risk of tissue damage increases
Solution Approach 1:
The patent uses periodic action by alternating between heating phases that provide sufficient denaturation time for sealing and cooling phases that interrupt thermal accumulation. This cyclic approach ensures that the total heating time is distributed in a way that achieves effective sealing while preventing any single prolonged heating episode from causing damage.
Solution Approach 2:
The patent exploits phase transitions in tissue state, specifically the transition between hydrated and dehydrated states during heating and cooling cycles. By controlling the timing and duration of these phase transitions, the system achieves complete denaturation and sealing while allowing rehydration periods that prevent excessive thermal damage.
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 sealing efficiency by uniformly denaturing tissue, reducing overall sealing time, and minimizing tissue damage through precise impedance management.
Implementation Method 1
The current results in localized heating of the biological tissue causing the tissue to dehydrate and denature the tissue
Data Source
AI summary
Method, device and treatment system for sealing living tissue using high frequency electrical energy provided to the living tissue by an end effector of a treatment instrument applies N cycles (N=natural number from 1 to 5, inclusive) of electrical energy to the living tissue by increasing, in each cycle, an amount of the high frequency electrical energy provided to the living tissue until the impedance of the living tissue increases to an impedance threshold value for that cycle, after which the amount of high frequency electrical energy is decreased to decrease the impedance of the living tissue by a predetermined value. The cycle repeats, with each subsequent cycle having an impedance threshold value greater than in the prior cycle, and the cycles stop when an N+1-th impedance reaches a impedance stop value. Initial values of impedance can be used to determine parameters of the cycles.