Motor-Driven RF Electrode Cutter for Precise Tissue Resection
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Solution Overview
Problem
Existing electrosurgical cutting devices face challenges in visually engaging and immobilizing target tissue, especially in limited access procedures like laparoscopic surgeries, and struggle with controlling cutter movement, RF power application, and vacuum aspiration during tissue resection.
Innovation Solution
The invention employs motor-driven cutters with controllers that coordinate shaft and electrode movements, using electrical parameters to determine electrode-tissue contact and modulate RF power and vacuum aspiration, enabling precise tissue resection and biopsy sampling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If manual engagement of cutting window against target tissue is used, then device complexity is reduced, but precision of tissue engagement and control of resection process deteriorates
Solution Approach 1:
The patent replaces manual mechanical engagement with an automated motor-driven cutter assembly that can be precisely controlled. The motor-driven mechanism allows for automated positioning and movement of the cutter electrode across the tissue, eliminating the need for manual manipulation while achieving superior precision in tissue engagement and resection control.
Solution Approach 2:
The patent incorporates feedback mechanisms through a controller that monitors electrical parameters to detect electrode-tissue contact and coordinates cutter movement with RF power application and vacuum aspiration. This closed-loop control system enables precise synchronization of multiple functions based on real-time tissue interaction signals.
2Manufacturing precision
If motor-driven cutter with coordinated control is used, then control precision of tissue resection is improved, but device complexity and control system requirements worsen
Solution Approach 1:
The patent merges multiple functions (cutter movement, RF power delivery, vacuum aspiration) into a single coordinated system controlled by a microprocessor. The controller integrates signals from electrical parameter monitoring to automatically coordinate all functions, reducing the need for separate manual controls and simplifying the overall device architecture despite the advanced control capabilities.
Solution Approach 2:
The motor-driven cutter assembly serves multiple functions simultaneously: mechanical cutting through motor-driven electrode movement, RF energy delivery for ablation, and vacuum aspiration for tissue removal. This multi-functionality is achieved through a single integrated control system that coordinates all operations based on real-time feedback, reducing the need for separate dedicated systems for each function.
3Productivity
If automated cutter movement coordinated with RF power and vacuum is used, then productivity of tissue resection is improved, but device complexity worsens
Solution Approach 1:
The patent enables continuous and coordinated action of multiple functions through automated control. The motor-driven cutter can continuously move the electrode across the tissue while RF power and vacuum aspiration operate simultaneously and are automatically adjusted based on real-time electrical parameter feedback, maintaining continuous productive action without interruption or manual intervention.
Solution Approach 2:
The controller continuously monitors electrical parameters during cutter movement and automatically adjusts RF power delivery and vacuum aspiration levels in real-time. This feedback mechanism ensures optimal coordination of all functions throughout the resection process, maintaining high productivity while adapting to changing tissue conditions without requiring manual intervention.
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 provides improved control over tissue resection, ensuring accurate engagement and extraction of tissue, particularly in minimally invasive procedures, with enhanced visibility and coordination of cutter movement, power control, and vacuum aspiration.
Implementation Method 1
The motor is configured to move the electrode across the tissue-receiving window to resect tissue
Implementation Method 2
current is delivered to the electrode to ignite a plasma around the electrode
Implementation Method 3
a negative pressure source coupled the passageway adapted for suctioning tissue into the window
Data Source
AI summary
A surgical system for treating targeted tissue in a fluid-filled working space includes a probe having an elongated shaft extending from a proximal end to a working end. A tissue-receiving window formed in the working end opens to a passageway in the elongated shaft, and a motor moves an electrode across the tissue-receiving window to resect tissue. A radiofrequency (RF) current source is coupled to the electrode, and a controller operatively connected to the motor and the RF source. In some instances, the controller actuates movement of the electrode in response to electrode contact with the targeted tissue. In some instances, the controller actuates movement of the electrode in a single stroke to perform biopsy.