Tissue Fusion Device with Resistance-Controlled Voltage
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Solution Overview
Problem
Existing devices for tissue fusion or coagulation face challenges in maintaining consistent tissue impedance control, leading to potential irreversible tissue changes due to excessive energy input, particularly during phase II of the impedance change process.
Innovation Solution
A device that regulates the voltage of the electrical source based on the measured tissue resistance during phase II, using a characteristic curve to control the energy input and prevent premature tissue dehydration, ensuring a consistent process time and quality of tissue fusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high energy input is applied to achieve rapid tissue fusion, then productivity is improved, but tissue impedance control deteriorates leading to irreversible tissue changes
Solution Approach 1:
The patent implements a feedback control system that continuously monitors tissue impedance during the fusion process and dynamically adjusts the energy input accordingly. The control unit receives impedance signals from the tissue and modifies the power delivery to maintain optimal impedance values, preventing both excessive energy input and process delays. This closed-loop control ensures reliable tissue fusion while avoiding irreversible tissue damage.
2Use of energy by moving object
If voltage is increased to maintain constant power during phase II, then energy input is improved, but tissue dehydration accelerates causing premature end of phase II
Solution Approach 1:
The patent employs dynamic voltage adjustment during phase II based on real-time impedance measurements. Instead of maintaining constant voltage or power, the system continuously adapts the voltage level according to the tissue's changing impedance characteristics. This dynamic control prevents premature tissue dehydration while ensuring adequate energy input for complete fusion, extending phase II duration to the optimal range without compromising energy delivery.
3Reliability
If process time is extended to ensure complete fusion, then reliability is improved, but productivity deteriorates due to excessive treatment time
Solution Approach 1:
The feedback control system monitors tissue impedance throughout the fusion process and automatically determines when optimal fusion has been achieved. By continuously comparing measured impedance values against target impedance profiles, the system can precisely terminate the process at the optimal moment, ensuring complete fusion without unnecessary extension of treatment time. This eliminates both under-treatment and over-treatment scenarios.
4Object-affected harmful factors
If impedance control is tightly regulated to prevent tissue damage, then safety is improved, but device complexity increases due to additional control mechanisms
Solution Approach 1:
The patent implements a self-regulating control system that uses the tissue's own impedance characteristics as the control parameter. The system automatically adjusts energy delivery based on real-time impedance feedback without requiring complex external monitoring or manual intervention. The control unit processes impedance signals and modulates power delivery through integrated circuitry, creating a self-adjusting system that prevents tissue damage while maintaining relatively simple device architecture.
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
The solution ensures reliable and consistent tissue fusion by maintaining a stable process time in phase II, preventing irreversible tissue changes and ensuring high-quality vascular anastomosis and coagulation.
Implementation Method 1
an electrical source (21) which supplies a current to the biological tissue (19)
Data Source
Figure 1~3
Figure 4~5
AI summary
The method involves attaching an electrode (16) to an electrical source i.e. direct current (DC) or alternating current (AC) voltage source, to be connected with a counter-electrode (17). Electrical tissue resistance is determined between the electrodes. An output voltage i.e. high-frequency AC voltage, is output from the source and controlled through the determined tissue resistance. A functional relationship having parameters e.g. open-circuit voltage, is determined for controlling the output voltage depending on a function of the determined tissue resistance. Independent claims are also included for the following: (1) a method for tissue fusion or coagulation using an electrode (2) a device for tissue fusion or coagulation by high-frequency AC current.