Electrosurgical System Impedance Feedback for Tissue Sealing
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Solution Overview
Problem
Current electrosurgical systems face challenges in achieving precise tissue sealing due to inadequate control over mechanical parameters like pressure and electrode gap distance, and the delivery of electrosurgical energy, which can result in inconsistent and ineffective tissue sealing.
Innovation Solution
An electrosurgical system that includes a bipolar forceps with impedance sensing circuitry and a processor to determine tissue reaction and calculate a target impedance trajectory, allowing for controlled energy delivery and a cooling period to ensure complete tissue sealing, using features like jaw angle sensors and adaptive cooling times based on tissue properties and energy delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrosurgical energy is delivered to seal tissue, then tissue sealing is achieved, but inadequate control over mechanical parameters (pressure, electrode gap distance) and energy delivery results in inconsistent sealing
Solution Approach 1:
The system continuously monitors tissue impedance during the sealing process and uses this feedback to dynamically adjust electrosurgical energy delivery parameters. The impedance sensor provides real-time data to the controller, which modifies energy delivery to maintain optimal sealing conditions, thereby achieving consistent sealing results while managing system complexity through automated control.
Solution Approach 2:
The system dynamically changes electrosurgical energy parameters (intensity, duration, frequency) based on real-time tissue impedance measurements. By continuously adjusting these parameters to match the tissue's changing electrical properties during sealing, the system achieves consistent sealing outcomes without requiring complex manual control mechanisms.
2Manufacturing precision
If electrosurgical energy is delivered to seal tissue, then tissue sealing is achieved, but the process lacks precise control over energy delivery timing and duration
Solution Approach 1:
The impedance monitoring system provides real-time feedback on tissue electrical properties during energy delivery. The controller uses this feedback to precisely determine when to start, adjust, and stop energy delivery, achieving accurate timing control that prevents both under-sealing and over-sealing while optimizing the overall sealing time.
Solution Approach 2:
The system performs preliminary impedance measurements before initiating energy delivery to establish a baseline. This preliminary action allows the controller to calculate the optimal energy delivery duration and timing, ensuring precise control from the start of the sealing process and avoiding unnecessary time delays.
3Reliability
If collagen in tissue is heated to seal, then tissue sealing is achieved, but the collagen must cool and solidify which requires additional time
Solution Approach 1:
The system initiates the cooling period immediately after energy delivery stops, rather than waiting for natural cooling. This preliminary action of transitioning to cooling mode ensures that collagen solidification begins without delay, maintaining seal strength while minimizing the total time the tissue remains in a vulnerable state.
Solution Approach 2:
The sealing process uses periodic action by alternating between energy delivery phases and cooling phases. The controller systematically cycles through these phases, ensuring adequate cooling time for collagen solidification while optimizing the overall cycle time. This periodic approach guarantees seal strength without excessive waiting periods.
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 system achieves consistent and effective tissue sealing by precisely controlling energy delivery and cooling times, ensuring the collagen in the tissue solidifies and denatures, resulting in a seal capable of withstanding high burst pressures.
Implementation Method 1
Electrosurgery involves application of high radio frequency electrical current to a surgical site to cut, ablate, or coagulate tissue
Implementation Method 2
the system transmits an initial interrogatory pulse for determining initial tissue impedance
Implementation Method 3
The system provides an indication that the end of the sealing process is completed, such as an audible sound (i.e., 'endtone'), whereupon the user may release the jaws
Data Source
AI summary
An electrosurgical system is disclosed. The electrosurgical system includes an electrosurgical generator adapted to supply electrosurgical energy to tissue. The electrosurgical generator includes impedance sensing circuitry which measures impedance of tissue, a processor configured to determine whether a tissue reaction has occurred as a function of a minimum impedance value and a predetermined rise in impedance, wherein tissue reaction corresponds to a boiling point of tissue fluid, and an electrosurgical instrument including at least one active electrode adapted to apply electrosurgical energy to tissue. A tissue cooling period is provided to enhance operative outcomes.