Electrosurgical Forceps Gap Control for Tissue Sealing
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Solution Overview
Problem
Existing electrosurgical instruments often fail to create a uniform and effective tissue seal due to inadequate control over mechanical and electrical parameters such as pressure, gap distance, and energy application, leading to inconsistent hemostasis in surgical procedures.
Innovation Solution
An electrosurgical system with jaw members that include a drive rod and end effector assembly, equipped with sensors to measure gap distance and a pressure applicator controlled by a controller to adjust pressure based on the measured gap distance, ensuring precise tissue sealing by controlling the rate of tissue thickness reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If clamping pressure alone is used to procure proper sealing thickness, then the device complexity is reduced, but the manufacturing precision and reliability of tissue seal are insufficient due to gap tolerances and parallelism requirements
Solution Approach 1:
The patent implements a feedback control system where gap distance sensors continuously measure the spacing between sealing plates and provide real-time feedback to a controller. The controller adjusts the clamping pressure dynamically based on the measured gap distance, ensuring that tissue is compressed to a target thickness regardless of initial gap variations. This closed-loop control resolves the contradiction by maintaining high sealing precision without requiring extremely tight manufacturing tolerances on the sealing plates themselves.
Solution Approach 2:
The patent transitions from a static clamping system to a dynamic one where the clamping pressure is continuously adjusted during the sealing process. The system dynamically modifies pressure based on real-time gap measurements, allowing the sealing process to adapt to variations in tissue thickness and plate positioning. This dynamic approach enables reliable sealing even with moderate manufacturing tolerances, resolving the contradiction between device complexity and sealing precision.
2Ease of operation
If gap distance between sealing plates is not controlled, then the ease of operation is improved, but the reliability of tissue seal deteriorates due to inconsistent energy delivery and pressure distribution
Solution Approach 1:
The system employs gap distance sensors that automatically measure and feedback the spacing between sealing plates to a controller. This eliminates the need for manual gap adjustment by the surgeon, maintaining ease of operation. The controller then automatically adjusts clamping pressure based on the measured gap, ensuring reliable and consistent tissue sealing regardless of the initial gap distance. This resolves the contradiction by making gap control automatic rather than manual.
Solution Approach 2:
The system performs self-adjustment of clamping pressure based on automatic gap measurements. The sensors and controller work autonomously to maintain optimal sealing conditions without requiring surgeon intervention or skill for gap management. This self-service capability maintains ease of operation while ensuring reliable sealing through consistent pressure and energy delivery.
3Manufacturing precision
If real-time pressure control based on gap distance is implemented, then the manufacturing precision and reliability of tissue seal are improved, but the device complexity increases due to additional sensors and control systems
Solution Approach 1:
The patent integrates gap distance sensors and a controller that forms a feedback loop to automatically adjust clamping pressure. While this adds components, the feedback mechanism enables precise control of tissue compression, ensuring consistent sealing thickness and reliable energy delivery. The added complexity is justified by the significant improvement in sealing precision and reliability, particularly for achieving uniform tissue seals across varying tissue thicknesses.
Solution Approach 2:
The patent replaces manual mechanical gap adjustment with an automated system using sensors and electronic control. Instead of relying on mechanical precision of the sealing plates themselves, the system uses electronic sensing and control to achieve the desired precision. This substitution reduces the need for extremely tight mechanical tolerances while maintaining high sealing precision, making the trade-off in device complexity acceptable.
4Ease of operation
If gap distance is not monitored, then the ease of operation is maintained, but the productivity and consistency of sealing procedures deteriorate due to variable tissue thickness and incomplete seals
Solution Approach 1:
The system uses gap distance sensors to provide real-time feedback on the spacing between sealing plates, enabling automatic adjustment of clamping pressure. This ensures that each tissue seal achieves the target thickness and complete seal regardless of initial tissue thickness variations. The automated feedback control maintains ease of operation while dramatically improving the consistency and reliability of sealing outcomes, thereby enhancing procedural productivity.
Solution Approach 2:
The system performs preliminary measurement of gap distance before energy delivery, allowing the controller to pre-adjust clamping pressure to the optimal level for the specific tissue thickness. This preliminary action ensures that when energy is applied, the tissue is already properly positioned and compressed, leading to consistent and complete seals. This eliminates the need for trial-and-error adjustments during the procedure, improving productivity while maintaining ease of use.
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 a consistent and reliable tissue seal by controlling the pressure applied to the tissue in real-time, maintaining the mucosa and submucosa layers within the seal area, thereby enhancing the strength and effectiveness of the seal.
Implementation Method 1
one or more sensors that determine a gap distance between the sealing plates of the jaw members
Implementation Method 2
The pressure applicator is configured to move the drive rod in a longitudinal direction
Implementation Method 3
Each of the jaw members includes a sealing plate that communicates electrosurgical energy through tissue held therebetween
Implementation Method 4
a controller adapted to communicate with the sensors and to control the pressure applicator in response to the determined gap distance during the sealing process
Data Source
AI summary
An electrosurgical system for sealing tissue is disclosed that includes an electrosurgical forceps. The forceps includes a drive rod and an end effector assembly coupled to the drive rod at a distal end thereof. The end effector assembly includes jaw members wherein longitudinal reciprocation of the drive rod moves the jaw members from a first position in spaced relation relative to one another to a subsequent position wherein the jaw members cooperate to grasp tissue therebetween. Each of the jaw members includes a sealing plate that communicates electrosurgical energy through tissue held therebetween. The jaw members are adapted to connect to an electrosurgical generator. The system also includes one or more sensors that determine a gap distance between the sealing plates of the jaw members and a pressure applicator coupled to the drive rod. The pressure applicator is configured to move the drive rod in a longitudinal direction. The system further includes a controller adapted to communicate with the sensors and to control the pressure applicator in response to the determined gap distance during the sealing process.