RF Energy Console for Blood Vessel Sealing
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Solution Overview
Problem
Existing RF energy sealing technologies face difficulties in resealing blood vessels effectively, as the maximum measured current for resealing is significantly smaller than for initial sealing, making it challenging to determine the completion of a seal without modifying algorithms or comparison values.
Innovation Solution
The RF energy console uses measured voltage, current, and impedance changes to control the sealing process, applying a predetermined ramping voltage to achieve boiling and transitioning to a sealing stage based on a percent decrease in current, allowing for accurate determination of seal completion without requiring different routines or algorithms for resealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If maximum current values are used to determine seal completion, then initial sealing can be detected, but resealing becomes difficult due to significantly smaller current values
Solution Approach 1:
The system transitions from using absolute current values to using percentage changes in current values. During initial sealing, the system monitors current values to detect when the vessel is sealed. During resealing operations, the system calculates the percentage decrease in current value from the initial sealing phase, allowing accurate detection of seal completion without being limited by the smaller absolute current values that occur during resealing. This parameter transformation enables the same detection mechanism to work effectively for both initial sealing and resealing operations.
2Measurement precision
If different algorithms are provided for resealing, then resealing accuracy can be improved, but device complexity increases
Solution Approach 1:
The system implements a universal control algorithm that handles both initial sealing and resealing operations using the same percentage-based current change detection mechanism. Instead of requiring separate algorithms for different sealing phases, the system calculates the percentage decrease in current value relative to the initial sealing phase, allowing a single unified algorithm to accurately detect seal completion in both scenarios. This approach reduces device complexity while maintaining high detection accuracy for both initial sealing and resealing operations.
3Ease of operation
If percentage current decrease is used to determine boiling, then resealing can be controlled accurately, but measurement sensitivity requirements increase
Solution Approach 1:
The system continuously monitors current values during the sealing process and calculates the percentage change from the initial sealing phase. This feedback mechanism allows the system to dynamically adjust the sealing parameters based on the actual current changes observed. By using percentage-based feedback rather than absolute values, the system can accurately detect boiling conditions during resealing operations even with variations in the baseline current levels, maintaining ease of operation while managing measurement sensitivity requirements through continuous adaptive monitoring.
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 enables efficient resealing of blood vessels without the need for separate routines or algorithms, ensuring reliable seal completion and enhancing the quality of the seal by utilizing percentage current decreases to determine boiling and control the sealing process.
Implementation Method 1
RF generator devices that apply RF energy pulses to tissue
Implementation Method 2
heating of fluid in a blood vessel to a boiling condition during a resealing operation
Data Source
AI summary
A RF energy console controls RF energy output from a RF generator for sealing blood vessels. The energy console includes a processor that executes routines and a controller feedback circuit that, in combination, control the RF generator. Operation includes a heating stage outputting a RF ramping voltage and determining a decrease in measured current to less than a predetermined % percentage of a maximum measured and stored current value to advance to a sealing stage. Then, the voltage is controlled to maintain an increasing change in impedance until a change in current value approaches a flat curve indicating seal completion, which stops the RF generator output. To reseal or enhance a blood vessel seal, the energy console executes the same routines as in the initial sealing operation.